net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = chanctx_conf->def.chan->max_power;
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         drv_flush(local, false);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 void ieee80211_recalc_idle(struct ieee80211_local *local)
 102 {
 103         bool working = false, scanning, active;
 104         unsigned int led_trig_start = 0, led_trig_stop = 0;
 105         struct ieee80211_roc_work *roc;
 106         u32 change;
 107
 108         lockdep_assert_held(&local->mtx);
 109
 110         active = !list_empty(&local->chanctx_list);
 111
 112         if (!local->ops->remain_on_channel) {
 113                 list_for_each_entry(roc, &local->roc_list, list) {
 114                         working = true;
 115                         break;
 116                 }
 117         }
 118
 119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 121
 122         if (working || scanning)
 123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 124         else
 125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126
 127         if (active)
 128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 129         else
 130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131
 132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 133
 134         if (working || scanning || active)
 135                 change = ieee80211_idle_off(local);
 136         else
 137                 change = ieee80211_idle_on(local);
 138         if (change)
 139                 ieee80211_hw_config(local, change);
 140 }
 141
 142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 143 {
 144         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 145                 return -EINVAL;
 146
 147         dev->mtu = new_mtu;
 148         return 0;
 149 }
 150
 151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
 152 {
 153         struct ieee80211_sub_if_data *sdata;
 154         u64 new, mask, tmp;
 155         u8 *m;
 156         int ret = 0;
 157
 158         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 159                 return 0;
 160
 161         m = addr;
 162         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 163                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 164                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 165
 166         m = local->hw.wiphy->addr_mask;
 167         mask =  ((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
 172         mutex_lock(&local->iflist_mtx);
 173         list_for_each_entry(sdata, &local->interfaces, list) {
 174                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
 175                         continue;
 176
 177                 m = sdata->vif.addr;
 178                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 179                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 180                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 181
 182                 if ((new & ~mask) != (tmp & ~mask)) {
 183                         ret = -EINVAL;
 184                         break;
 185                 }
 186         }
 187         mutex_unlock(&local->iflist_mtx);
 188
 189         return ret;
 190 }
 191
 192 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 193 {
 194         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 195         struct sockaddr *sa = addr;
 196         int ret;
 197
 198         if (ieee80211_sdata_running(sdata))
 199                 return -EBUSY;
 200
 201         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
 202         if (ret)
 203                 return ret;
 204
 205         ret = eth_mac_addr(dev, sa);
 206
 207         if (ret == 0)
 208                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 209
 210         return ret;
 211 }
 212
 213 static inline int identical_mac_addr_allowed(int type1, int type2)
 214 {
 215         return type1 == NL80211_IFTYPE_MONITOR ||
 216                 type2 == NL80211_IFTYPE_MONITOR ||
 217                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 218                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 219                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 220                 (type1 == NL80211_IFTYPE_WDS &&
 221                         (type2 == NL80211_IFTYPE_WDS ||
 222                          type2 == NL80211_IFTYPE_AP)) ||
 223                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 224                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 225                         (type2 == NL80211_IFTYPE_AP ||
 226                          type2 == NL80211_IFTYPE_AP_VLAN));
 227 }
 228
 229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 230                                             enum nl80211_iftype iftype)
 231 {
 232         struct ieee80211_local *local = sdata->local;
 233         struct ieee80211_sub_if_data *nsdata;
 234
 235         ASSERT_RTNL();
 236
 237         /* we hold the RTNL here so can safely walk the list */
 238         list_for_each_entry(nsdata, &local->interfaces, list) {
 239                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 240                         /*
 241                          * Allow only a single IBSS interface to be up at any
 242                          * time. This is restricted because beacon distribution
 243                          * cannot work properly if both are in the same IBSS.
 244                          *
 245                          * To remove this restriction we'd have to disallow them
 246                          * from setting the same SSID on different IBSS interfaces
 247                          * belonging to the same hardware. Then, however, we're
 248                          * faced with having to adopt two different TSF timers...
 249                          */
 250                         if (iftype == NL80211_IFTYPE_ADHOC &&
 251                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 252                                 return -EBUSY;
 253
 254                         /*
 255                          * The remaining checks are only performed for interfaces
 256                          * with the same MAC address.
 257                          */
 258                         if (!ether_addr_equal(sdata->vif.addr,
 259                                               nsdata->vif.addr))
 260                                 continue;
 261
 262                         /*
 263                          * check whether it may have the same address
 264                          */
 265                         if (!identical_mac_addr_allowed(iftype,
 266                                                         nsdata->vif.type))
 267                                 return -ENOTUNIQ;
 268
 269                         /*
 270                          * can only add VLANs to enabled APs
 271                          */
 272                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 273                             nsdata->vif.type == NL80211_IFTYPE_AP)
 274                                 sdata->bss = &nsdata->u.ap;
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 282 {
 283         int n_queues = sdata->local->hw.queues;
 284         int i;
 285
 286         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 287                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 288                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 289                                          IEEE80211_INVAL_HW_QUEUE))
 290                                 return -EINVAL;
 291                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 292                                          n_queues))
 293                                 return -EINVAL;
 294                 }
 295         }
 296
 297         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 298             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 299                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 300                 return 0;
 301         }
 302
 303         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 304                 return -EINVAL;
 305
 306         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 307                 return -EINVAL;
 308
 309         return 0;
 310 }
 311
 312 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 313                                     const int offset)
 314 {
 315         struct ieee80211_local *local = sdata->local;
 316         u32 flags = sdata->u.mntr_flags;
 317
 318 #define ADJUST(_f, _s)  do {                                    \
 319         if (flags & MONITOR_FLAG_##_f)                          \
 320                 local->fif_##_s += offset;                      \
 321         } while (0)
 322
 323         ADJUST(FCSFAIL, fcsfail);
 324         ADJUST(PLCPFAIL, plcpfail);
 325         ADJUST(CONTROL, control);
 326         ADJUST(CONTROL, pspoll);
 327         ADJUST(OTHER_BSS, other_bss);
 328
 329 #undef ADJUST
 330 }
 331
 332 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 333 {
 334         struct ieee80211_local *local = sdata->local;
 335         int i;
 336
 337         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 338                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 339                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 340                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 341                         sdata->vif.hw_queue[i] = i;
 342                 else
 343                         sdata->vif.hw_queue[i] = 0;
 344         }
 345         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 346 }
 347
 348 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 349 {
 350         struct ieee80211_sub_if_data *sdata;
 351         int ret = 0;
 352
 353         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 354                 return 0;
 355
 356         mutex_lock(&local->iflist_mtx);
 357
 358         if (local->monitor_sdata)
 359                 goto out_unlock;
 360
 361         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 362         if (!sdata) {
 363                 ret = -ENOMEM;
 364                 goto out_unlock;
 365         }
 366
 367         /* set up data */
 368         sdata->local = local;
 369         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 370         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 371                  wiphy_name(local->hw.wiphy));
 372
 373         ieee80211_set_default_queues(sdata);
 374
 375         ret = drv_add_interface(local, sdata);
 376         if (WARN_ON(ret)) {
 377                 /* ok .. stupid driver, it asked for this! */
 378                 kfree(sdata);
 379                 goto out_unlock;
 380         }
 381
 382         ret = ieee80211_check_queues(sdata);
 383         if (ret) {
 384                 kfree(sdata);
 385                 goto out_unlock;
 386         }
 387
 388         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 389                                         IEEE80211_CHANCTX_EXCLUSIVE);
 390         if (ret) {
 391                 drv_remove_interface(local, sdata);
 392                 kfree(sdata);
 393                 goto out_unlock;
 394         }
 395
 396         rcu_assign_pointer(local->monitor_sdata, sdata);
 397  out_unlock:
 398         mutex_unlock(&local->iflist_mtx);
 399         return ret;
 400 }
 401
 402 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 403 {
 404         struct ieee80211_sub_if_data *sdata;
 405
 406         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 407                 return;
 408
 409         mutex_lock(&local->iflist_mtx);
 410
 411         sdata = rcu_dereference_protected(local->monitor_sdata,
 412                                           lockdep_is_held(&local->iflist_mtx));
 413         if (!sdata)
 414                 goto out_unlock;
 415
 416         rcu_assign_pointer(local->monitor_sdata, NULL);
 417         synchronize_net();
 418
 419         ieee80211_vif_release_channel(sdata);
 420
 421         drv_remove_interface(local, sdata);
 422
 423         kfree(sdata);
 424  out_unlock:
 425         mutex_unlock(&local->iflist_mtx);
 426 }
 427
 428 /*
 429  * NOTE: Be very careful when changing this function, it must NOT return
 430  * an error on interface type changes that have been pre-checked, so most
 431  * checks should be in ieee80211_check_concurrent_iface.
 432  */
 433 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 434 {
 435         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 436         struct net_device *dev = wdev->netdev;
 437         struct ieee80211_local *local = sdata->local;
 438         struct sta_info *sta;
 439         u32 changed = 0;
 440         int res;
 441         u32 hw_reconf_flags = 0;
 442
 443         switch (sdata->vif.type) {
 444         case NL80211_IFTYPE_WDS:
 445                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 446                         return -ENOLINK;
 447                 break;
 448         case NL80211_IFTYPE_AP_VLAN: {
 449                 struct ieee80211_sub_if_data *master;
 450
 451                 if (!sdata->bss)
 452                         return -ENOLINK;
 453
 454                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 455
 456                 master = container_of(sdata->bss,
 457                                       struct ieee80211_sub_if_data, u.ap);
 458                 sdata->control_port_protocol =
 459                         master->control_port_protocol;
 460                 sdata->control_port_no_encrypt =
 461                         master->control_port_no_encrypt;
 462                 break;
 463                 }
 464         case NL80211_IFTYPE_AP:
 465                 sdata->bss = &sdata->u.ap;
 466                 break;
 467         case NL80211_IFTYPE_MESH_POINT:
 468         case NL80211_IFTYPE_STATION:
 469         case NL80211_IFTYPE_MONITOR:
 470         case NL80211_IFTYPE_ADHOC:
 471         case NL80211_IFTYPE_P2P_DEVICE:
 472                 /* no special treatment */
 473                 break;
 474         case NL80211_IFTYPE_UNSPECIFIED:
 475         case NUM_NL80211_IFTYPES:
 476         case NL80211_IFTYPE_P2P_CLIENT:
 477         case NL80211_IFTYPE_P2P_GO:
 478                 /* cannot happen */
 479                 WARN_ON(1);
 480                 break;
 481         }
 482
 483         if (local->open_count == 0) {
 484                 res = drv_start(local);
 485                 if (res)
 486                         goto err_del_bss;
 487                 if (local->ops->napi_poll)
 488                         napi_enable(&local->napi);
 489                 /* we're brought up, everything changes */
 490                 hw_reconf_flags = ~0;
 491                 ieee80211_led_radio(local, true);
 492                 ieee80211_mod_tpt_led_trig(local,
 493                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 494         }
 495
 496         /*
 497          * Copy the hopefully now-present MAC address to
 498          * this interface, if it has the special null one.
 499          */
 500         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 501                 memcpy(dev->dev_addr,
 502                        local->hw.wiphy->perm_addr,
 503                        ETH_ALEN);
 504                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 505
 506                 if (!is_valid_ether_addr(dev->dev_addr)) {
 507                         res = -EADDRNOTAVAIL;
 508                         goto err_stop;
 509                 }
 510         }
 511
 512         switch (sdata->vif.type) {
 513         case NL80211_IFTYPE_AP_VLAN:
 514                 /* no need to tell driver, but set carrier and chanctx */
 515                 if (rtnl_dereference(sdata->bss->beacon)) {
 516                         ieee80211_vif_vlan_copy_chanctx(sdata);
 517                         netif_carrier_on(dev);
 518                 } else {
 519                         netif_carrier_off(dev);
 520                 }
 521                 break;
 522         case NL80211_IFTYPE_MONITOR:
 523                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 524                         local->cooked_mntrs++;
 525                         break;
 526                 }
 527
 528                 if (local->monitors == 0 && local->open_count == 0) {
 529                         res = ieee80211_add_virtual_monitor(local);
 530                         if (res)
 531                                 goto err_stop;
 532                 }
 533
 534                 /* must be before the call to ieee80211_configure_filter */
 535                 local->monitors++;
 536                 if (local->monitors == 1) {
 537                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 538                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 539                 }
 540
 541                 ieee80211_adjust_monitor_flags(sdata, 1);
 542                 ieee80211_configure_filter(local);
 543
 544                 netif_carrier_on(dev);
 545                 break;
 546         default:
 547                 if (coming_up) {
 548                         ieee80211_del_virtual_monitor(local);
 549
 550                         res = drv_add_interface(local, sdata);
 551                         if (res)
 552                                 goto err_stop;
 553                         res = ieee80211_check_queues(sdata);
 554                         if (res)
 555                                 goto err_del_interface;
 556                 }
 557
 558                 drv_add_interface_debugfs(local, sdata);
 559
 560                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 561                         local->fif_pspoll++;
 562                         local->fif_probe_req++;
 563
 564                         ieee80211_configure_filter(local);
 565                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 566                         local->fif_probe_req++;
 567                 }
 568
 569                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 570                         changed |= ieee80211_reset_erp_info(sdata);
 571                 ieee80211_bss_info_change_notify(sdata, changed);
 572
 573                 switch (sdata->vif.type) {
 574                 case NL80211_IFTYPE_STATION:
 575                 case NL80211_IFTYPE_ADHOC:
 576                 case NL80211_IFTYPE_AP:
 577                 case NL80211_IFTYPE_MESH_POINT:
 578                         netif_carrier_off(dev);
 579                         break;
 580                 case NL80211_IFTYPE_WDS:
 581                 case NL80211_IFTYPE_P2P_DEVICE:
 582                         break;
 583                 default:
 584                         netif_carrier_on(dev);
 585                 }
 586
 587                 /*
 588                  * set default queue parameters so drivers don't
 589                  * need to initialise the hardware if the hardware
 590                  * doesn't start up with sane defaults
 591                  */
 592                 ieee80211_set_wmm_default(sdata, true);
 593         }
 594
 595         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 596
 597         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 598                 /* Create STA entry for the WDS peer */
 599                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 600                                      GFP_KERNEL);
 601                 if (!sta) {
 602                         res = -ENOMEM;
 603                         goto err_del_interface;
 604                 }
 605
 606                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 607                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 608                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 609
 610                 res = sta_info_insert(sta);
 611                 if (res) {
 612                         /* STA has been freed */
 613                         goto err_del_interface;
 614                 }
 615
 616                 rate_control_rate_init(sta);
 617                 netif_carrier_on(dev);
 618         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 619                 rcu_assign_pointer(local->p2p_sdata, sdata);
 620         }
 621
 622         /*
 623          * set_multicast_list will be invoked by the networking core
 624          * which will check whether any increments here were done in
 625          * error and sync them down to the hardware as filter flags.
 626          */
 627         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 628                 atomic_inc(&local->iff_allmultis);
 629
 630         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 631                 atomic_inc(&local->iff_promiscs);
 632
 633         if (coming_up)
 634                 local->open_count++;
 635
 636         if (hw_reconf_flags)
 637                 ieee80211_hw_config(local, hw_reconf_flags);
 638
 639         ieee80211_recalc_ps(local, -1);
 640
 641         if (dev)
 642                 netif_tx_start_all_queues(dev);
 643
 644         return 0;
 645  err_del_interface:
 646         drv_remove_interface(local, sdata);
 647  err_stop:
 648         if (!local->open_count)
 649                 drv_stop(local);
 650  err_del_bss:
 651         sdata->bss = NULL;
 652         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 653                 list_del(&sdata->u.vlan.list);
 654         /* might already be clear but that doesn't matter */
 655         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 656         return res;
 657 }
 658
 659 static int ieee80211_open(struct net_device *dev)
 660 {
 661         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 662         int err;
 663
 664         /* fail early if user set an invalid address */
 665         if (!is_valid_ether_addr(dev->dev_addr))
 666                 return -EADDRNOTAVAIL;
 667
 668         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 669         if (err)
 670                 return err;
 671
 672         return ieee80211_do_open(&sdata->wdev, true);
 673 }
 674
 675 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 676                               bool going_down)
 677 {
 678         struct ieee80211_local *local = sdata->local;
 679         unsigned long flags;
 680         struct sk_buff *skb, *tmp;
 681         u32 hw_reconf_flags = 0;
 682         int i, flushed;
 683         struct ps_data *ps;
 684
 685         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 686
 687         if (rcu_access_pointer(local->scan_sdata) == sdata)
 688                 ieee80211_scan_cancel(local);
 689
 690         /*
 691          * Stop TX on this interface first.
 692          */
 693         if (sdata->dev)
 694                 netif_tx_stop_all_queues(sdata->dev);
 695
 696         ieee80211_roc_purge(sdata);
 697
 698         /*
 699          * Remove all stations associated with this interface.
 700          *
 701          * This must be done before calling ops->remove_interface()
 702          * because otherwise we can later invoke ops->sta_notify()
 703          * whenever the STAs are removed, and that invalidates driver
 704          * assumptions about always getting a vif pointer that is valid
 705          * (because if we remove a STA after ops->remove_interface()
 706          * the driver will have removed the vif info already!)
 707          *
 708          * This is relevant only in WDS mode, in all other modes we've
 709          * already removed all stations when disconnecting or similar,
 710          * so warn otherwise.
 711          *
 712          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 713          */
 714         flushed = sta_info_flush_defer(sdata);
 715         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 716                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 717
 718         /*
 719          * Don't count this interface for promisc/allmulti while it
 720          * is down. dev_mc_unsync() will invoke set_multicast_list
 721          * on the master interface which will sync these down to the
 722          * hardware as filter flags.
 723          */
 724         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 725                 atomic_dec(&local->iff_allmultis);
 726
 727         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 728                 atomic_dec(&local->iff_promiscs);
 729
 730         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 731                 local->fif_pspoll--;
 732                 local->fif_probe_req--;
 733         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 734                 local->fif_probe_req--;
 735         }
 736
 737         if (sdata->dev) {
 738                 netif_addr_lock_bh(sdata->dev);
 739                 spin_lock_bh(&local->filter_lock);
 740                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 741                                  sdata->dev->addr_len);
 742                 spin_unlock_bh(&local->filter_lock);
 743                 netif_addr_unlock_bh(sdata->dev);
 744
 745                 ieee80211_configure_filter(local);
 746         }
 747
 748         del_timer_sync(&local->dynamic_ps_timer);
 749         cancel_work_sync(&local->dynamic_ps_enable_work);
 750
 751         cancel_work_sync(&sdata->recalc_smps);
 752
 753         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 754
 755         if (sdata->wdev.cac_started) {
 756                 mutex_lock(&local->iflist_mtx);
 757                 ieee80211_vif_release_channel(sdata);
 758                 mutex_unlock(&local->iflist_mtx);
 759                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 760                                    GFP_KERNEL);
 761         }
 762
 763         /* APs need special treatment */
 764         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 765                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 766
 767                 /* down all dependent devices, that is VLANs */
 768                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 769                                          u.vlan.list)
 770                         dev_close(vlan->dev);
 771                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 772         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 773                 /* remove all packets in parent bc_buf pointing to this dev */
 774                 ps = &sdata->bss->ps;
 775
 776                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 777                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 778                         if (skb->dev == sdata->dev) {
 779                                 __skb_unlink(skb, &ps->bc_buf);
 780                                 local->total_ps_buffered--;
 781                                 ieee80211_free_txskb(&local->hw, skb);
 782                         }
 783                 }
 784                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 785         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 786                 ieee80211_mgd_stop(sdata);
 787         }
 788
 789         if (going_down)
 790                 local->open_count--;
 791
 792         switch (sdata->vif.type) {
 793         case NL80211_IFTYPE_AP_VLAN:
 794                 list_del(&sdata->u.vlan.list);
 795                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 796                 /* no need to tell driver */
 797                 break;
 798         case NL80211_IFTYPE_MONITOR:
 799                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 800                         local->cooked_mntrs--;
 801                         break;
 802                 }
 803
 804                 local->monitors--;
 805                 if (local->monitors == 0) {
 806                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 807                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 808                         ieee80211_del_virtual_monitor(local);
 809                 }
 810
 811                 ieee80211_adjust_monitor_flags(sdata, -1);
 812                 ieee80211_configure_filter(local);
 813                 break;
 814         case NL80211_IFTYPE_P2P_DEVICE:
 815                 /* relies on synchronize_rcu() below */
 816                 rcu_assign_pointer(local->p2p_sdata, NULL);
 817                 /* fall through */
 818         default:
 819                 cancel_work_sync(&sdata->work);
 820                 /*
 821                  * When we get here, the interface is marked down.
 822                  *
 823                  * sta_info_flush_cleanup() requires rcu_barrier()
 824                  * first to wait for the station call_rcu() calls
 825                  * to complete, here we need at least sychronize_rcu()
 826                  * it to wait for the RX path in case it is using the
 827                  * interface and enqueuing frames at this very time on
 828                  * another CPU.
 829                  */
 830                 rcu_barrier();
 831                 sta_info_flush_cleanup(sdata);
 832
 833                 skb_queue_purge(&sdata->skb_queue);
 834
 835                 /*
 836                  * Free all remaining keys, there shouldn't be any,
 837                  * except maybe group keys in AP more or WDS?
 838                  */
 839                 ieee80211_free_keys(sdata);
 840
 841                 drv_remove_interface_debugfs(local, sdata);
 842
 843                 if (going_down)
 844                         drv_remove_interface(local, sdata);
 845         }
 846
 847         sdata->bss = NULL;
 848
 849         ieee80211_recalc_ps(local, -1);
 850
 851         if (local->open_count == 0) {
 852                 if (local->ops->napi_poll)
 853                         napi_disable(&local->napi);
 854                 ieee80211_clear_tx_pending(local);
 855                 ieee80211_stop_device(local);
 856
 857                 /* no reconfiguring after stop! */
 858                 hw_reconf_flags = 0;
 859         }
 860
 861         /* do after stop to avoid reconfiguring when we stop anyway */
 862         if (hw_reconf_flags)
 863                 ieee80211_hw_config(local, hw_reconf_flags);
 864
 865         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 866         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 867                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 868                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 869                         if (info->control.vif == &sdata->vif) {
 870                                 __skb_unlink(skb, &local->pending[i]);
 871                                 ieee80211_free_txskb(&local->hw, skb);
 872                         }
 873                 }
 874         }
 875         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 876
 877         if (local->monitors == local->open_count && local->monitors > 0)
 878                 ieee80211_add_virtual_monitor(local);
 879 }
 880
 881 static int ieee80211_stop(struct net_device *dev)
 882 {
 883         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 884
 885         ieee80211_do_stop(sdata, true);
 886
 887         return 0;
 888 }
 889
 890 static void ieee80211_set_multicast_list(struct net_device *dev)
 891 {
 892         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 893         struct ieee80211_local *local = sdata->local;
 894         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 895
 896         allmulti = !!(dev->flags & IFF_ALLMULTI);
 897         promisc = !!(dev->flags & IFF_PROMISC);
 898         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 899         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 900
 901         if (allmulti != sdata_allmulti) {
 902                 if (dev->flags & IFF_ALLMULTI)
 903                         atomic_inc(&local->iff_allmultis);
 904                 else
 905                         atomic_dec(&local->iff_allmultis);
 906                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 907         }
 908
 909         if (promisc != sdata_promisc) {
 910                 if (dev->flags & IFF_PROMISC)
 911                         atomic_inc(&local->iff_promiscs);
 912                 else
 913                         atomic_dec(&local->iff_promiscs);
 914                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 915         }
 916         spin_lock_bh(&local->filter_lock);
 917         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 918         spin_unlock_bh(&local->filter_lock);
 919         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 920 }
 921
 922 /*
 923  * Called when the netdev is removed or, by the code below, before
 924  * the interface type changes.
 925  */
 926 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 927 {
 928         int flushed;
 929         int i;
 930
 931         /* free extra data */
 932         ieee80211_free_keys(sdata);
 933
 934         ieee80211_debugfs_remove_netdev(sdata);
 935
 936         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 937                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 938         sdata->fragment_next = 0;
 939
 940         if (ieee80211_vif_is_mesh(&sdata->vif))
 941                 mesh_rmc_free(sdata);
 942
 943         flushed = sta_info_flush(sdata);
 944         WARN_ON(flushed);
 945 }
 946
 947 static void ieee80211_uninit(struct net_device *dev)
 948 {
 949         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 950 }
 951
 952 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 953                                          struct sk_buff *skb)
 954 {
 955         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 956 }
 957
 958 static const struct net_device_ops ieee80211_dataif_ops = {
 959         .ndo_open               = ieee80211_open,
 960         .ndo_stop               = ieee80211_stop,
 961         .ndo_uninit             = ieee80211_uninit,
 962         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 963         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 964         .ndo_change_mtu         = ieee80211_change_mtu,
 965         .ndo_set_mac_address    = ieee80211_change_mac,
 966         .ndo_select_queue       = ieee80211_netdev_select_queue,
 967 };
 968
 969 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 970                                           struct sk_buff *skb)
 971 {
 972         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 973         struct ieee80211_local *local = sdata->local;
 974         struct ieee80211_hdr *hdr;
 975         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 976
 977         if (local->hw.queues < IEEE80211_NUM_ACS)
 978                 return 0;
 979
 980         if (skb->len < 4 ||
 981             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 982                 return 0; /* doesn't matter, frame will be dropped */
 983
 984         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 985
 986         return ieee80211_select_queue_80211(sdata, skb, hdr);
 987 }
 988
 989 static const struct net_device_ops ieee80211_monitorif_ops = {
 990         .ndo_open               = ieee80211_open,
 991         .ndo_stop               = ieee80211_stop,
 992         .ndo_uninit             = ieee80211_uninit,
 993         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 994         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 995         .ndo_change_mtu         = ieee80211_change_mtu,
 996         .ndo_set_mac_address    = eth_mac_addr,
 997         .ndo_select_queue       = ieee80211_monitor_select_queue,
 998 };
 999
1000 static void ieee80211_if_setup(struct net_device *dev)
1001 {
1002         ether_setup(dev);
1003         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1004         dev->netdev_ops = &ieee80211_dataif_ops;
1005         dev->destructor = free_netdev;
1006 }
1007
1008 static void ieee80211_iface_work(struct work_struct *work)
1009 {
1010         struct ieee80211_sub_if_data *sdata =
1011                 container_of(work, struct ieee80211_sub_if_data, work);
1012         struct ieee80211_local *local = sdata->local;
1013         struct sk_buff *skb;
1014         struct sta_info *sta;
1015         struct ieee80211_ra_tid *ra_tid;
1016
1017         if (!ieee80211_sdata_running(sdata))
1018                 return;
1019
1020         if (local->scanning)
1021                 return;
1022
1023         /*
1024          * ieee80211_queue_work() should have picked up most cases,
1025          * here we'll pick the rest.
1026          */
1027         if (WARN(local->suspended,
1028                  "interface work scheduled while going to suspend\n"))
1029                 return;
1030
1031         /* first process frames */
1032         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1033                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1034
1035                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1036                         ra_tid = (void *)&skb->cb;
1037                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1038                                                  ra_tid->tid);
1039                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1040                         ra_tid = (void *)&skb->cb;
1041                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1042                                                 ra_tid->tid);
1043                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1044                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1045                         int len = skb->len;
1046
1047                         mutex_lock(&local->sta_mtx);
1048                         sta = sta_info_get_bss(sdata, mgmt->sa);
1049                         if (sta) {
1050                                 switch (mgmt->u.action.u.addba_req.action_code) {
1051                                 case WLAN_ACTION_ADDBA_REQ:
1052                                         ieee80211_process_addba_request(
1053                                                         local, sta, mgmt, len);
1054                                         break;
1055                                 case WLAN_ACTION_ADDBA_RESP:
1056                                         ieee80211_process_addba_resp(local, sta,
1057                                                                      mgmt, len);
1058                                         break;
1059                                 case WLAN_ACTION_DELBA:
1060                                         ieee80211_process_delba(sdata, sta,
1061                                                                 mgmt, len);
1062                                         break;
1063                                 default:
1064                                         WARN_ON(1);
1065                                         break;
1066                                 }
1067                         }
1068                         mutex_unlock(&local->sta_mtx);
1069                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1070                         struct ieee80211_hdr *hdr = (void *)mgmt;
1071                         /*
1072                          * So the frame isn't mgmt, but frame_control
1073                          * is at the right place anyway, of course, so
1074                          * the if statement is correct.
1075                          *
1076                          * Warn if we have other data frame types here,
1077                          * they must not get here.
1078                          */
1079                         WARN_ON(hdr->frame_control &
1080                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1081                         WARN_ON(!(hdr->seq_ctrl &
1082                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1083                         /*
1084                          * This was a fragment of a frame, received while
1085                          * a block-ack session was active. That cannot be
1086                          * right, so terminate the session.
1087                          */
1088                         mutex_lock(&local->sta_mtx);
1089                         sta = sta_info_get_bss(sdata, mgmt->sa);
1090                         if (sta) {
1091                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1092                                                 IEEE80211_QOS_CTL_TID_MASK;
1093
1094                                 __ieee80211_stop_rx_ba_session(
1095                                         sta, tid, WLAN_BACK_RECIPIENT,
1096                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1097                                         true);
1098                         }
1099                         mutex_unlock(&local->sta_mtx);
1100                 } else switch (sdata->vif.type) {
1101                 case NL80211_IFTYPE_STATION:
1102                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1103                         break;
1104                 case NL80211_IFTYPE_ADHOC:
1105                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1106                         break;
1107                 case NL80211_IFTYPE_MESH_POINT:
1108                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1109                                 break;
1110                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1111                         break;
1112                 default:
1113                         WARN(1, "frame for unexpected interface type");
1114                         break;
1115                 }
1116
1117                 kfree_skb(skb);
1118         }
1119
1120         /* then other type-dependent work */
1121         switch (sdata->vif.type) {
1122         case NL80211_IFTYPE_STATION:
1123                 ieee80211_sta_work(sdata);
1124                 break;
1125         case NL80211_IFTYPE_ADHOC:
1126                 ieee80211_ibss_work(sdata);
1127                 break;
1128         case NL80211_IFTYPE_MESH_POINT:
1129                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1130                         break;
1131                 ieee80211_mesh_work(sdata);
1132                 break;
1133         default:
1134                 break;
1135         }
1136 }
1137
1138 static void ieee80211_recalc_smps_work(struct work_struct *work)
1139 {
1140         struct ieee80211_sub_if_data *sdata =
1141                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1142
1143         ieee80211_recalc_smps(sdata);
1144 }
1145
1146 /*
1147  * Helper function to initialise an interface to a specific type.
1148  */
1149 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1150                                   enum nl80211_iftype type)
1151 {
1152         /* clear type-dependent union */
1153         memset(&sdata->u, 0, sizeof(sdata->u));
1154
1155         /* and set some type-dependent values */
1156         sdata->vif.type = type;
1157         sdata->vif.p2p = false;
1158         sdata->wdev.iftype = type;
1159
1160         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1161         sdata->control_port_no_encrypt = false;
1162
1163         sdata->noack_map = 0;
1164
1165         /* only monitor/p2p-device differ */
1166         if (sdata->dev) {
1167                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1168                 sdata->dev->type = ARPHRD_ETHER;
1169         }
1170
1171         skb_queue_head_init(&sdata->skb_queue);
1172         INIT_WORK(&sdata->work, ieee80211_iface_work);
1173         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1174
1175         switch (type) {
1176         case NL80211_IFTYPE_P2P_GO:
1177                 type = NL80211_IFTYPE_AP;
1178                 sdata->vif.type = type;
1179                 sdata->vif.p2p = true;
1180                 /* fall through */
1181         case NL80211_IFTYPE_AP:
1182                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1183                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1184                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1185                 break;
1186         case NL80211_IFTYPE_P2P_CLIENT:
1187                 type = NL80211_IFTYPE_STATION;
1188                 sdata->vif.type = type;
1189                 sdata->vif.p2p = true;
1190                 /* fall through */
1191         case NL80211_IFTYPE_STATION:
1192                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1193                 ieee80211_sta_setup_sdata(sdata);
1194                 break;
1195         case NL80211_IFTYPE_ADHOC:
1196                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1197                 ieee80211_ibss_setup_sdata(sdata);
1198                 break;
1199         case NL80211_IFTYPE_MESH_POINT:
1200                 if (ieee80211_vif_is_mesh(&sdata->vif))
1201                         ieee80211_mesh_init_sdata(sdata);
1202                 break;
1203         case NL80211_IFTYPE_MONITOR:
1204                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1205                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1206                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1207                                       MONITOR_FLAG_OTHER_BSS;
1208                 break;
1209         case NL80211_IFTYPE_WDS:
1210                 sdata->vif.bss_conf.bssid = NULL;
1211                 break;
1212         case NL80211_IFTYPE_AP_VLAN:
1213                 break;
1214         case NL80211_IFTYPE_P2P_DEVICE:
1215                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1216                 break;
1217         case NL80211_IFTYPE_UNSPECIFIED:
1218         case NUM_NL80211_IFTYPES:
1219                 BUG();
1220                 break;
1221         }
1222
1223         ieee80211_debugfs_add_netdev(sdata);
1224 }
1225
1226 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1227                                            enum nl80211_iftype type)
1228 {
1229         struct ieee80211_local *local = sdata->local;
1230         int ret, err;
1231         enum nl80211_iftype internal_type = type;
1232         bool p2p = false;
1233
1234         ASSERT_RTNL();
1235
1236         if (!local->ops->change_interface)
1237                 return -EBUSY;
1238
1239         switch (sdata->vif.type) {
1240         case NL80211_IFTYPE_AP:
1241         case NL80211_IFTYPE_STATION:
1242         case NL80211_IFTYPE_ADHOC:
1243                 /*
1244                  * Could maybe also all others here?
1245                  * Just not sure how that interacts
1246                  * with the RX/config path e.g. for
1247                  * mesh.
1248                  */
1249                 break;
1250         default:
1251                 return -EBUSY;
1252         }
1253
1254         switch (type) {
1255         case NL80211_IFTYPE_AP:
1256         case NL80211_IFTYPE_STATION:
1257         case NL80211_IFTYPE_ADHOC:
1258                 /*
1259                  * Could probably support everything
1260                  * but WDS here (WDS do_open can fail
1261                  * under memory pressure, which this
1262                  * code isn't prepared to handle).
1263                  */
1264                 break;
1265         case NL80211_IFTYPE_P2P_CLIENT:
1266                 p2p = true;
1267                 internal_type = NL80211_IFTYPE_STATION;
1268                 break;
1269         case NL80211_IFTYPE_P2P_GO:
1270                 p2p = true;
1271                 internal_type = NL80211_IFTYPE_AP;
1272                 break;
1273         default:
1274                 return -EBUSY;
1275         }
1276
1277         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1278         if (ret)
1279                 return ret;
1280
1281         ieee80211_do_stop(sdata, false);
1282
1283         ieee80211_teardown_sdata(sdata);
1284
1285         ret = drv_change_interface(local, sdata, internal_type, p2p);
1286         if (ret)
1287                 type = sdata->vif.type;
1288
1289         /*
1290          * Ignore return value here, there's not much we can do since
1291          * the driver changed the interface type internally already.
1292          * The warnings will hopefully make driver authors fix it :-)
1293          */
1294         ieee80211_check_queues(sdata);
1295
1296         ieee80211_setup_sdata(sdata, type);
1297
1298         err = ieee80211_do_open(&sdata->wdev, false);
1299         WARN(err, "type change: do_open returned %d", err);
1300
1301         return ret;
1302 }
1303
1304 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1305                              enum nl80211_iftype type)
1306 {
1307         int ret;
1308
1309         ASSERT_RTNL();
1310
1311         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1312                 return 0;
1313
1314         if (ieee80211_sdata_running(sdata)) {
1315                 ret = ieee80211_runtime_change_iftype(sdata, type);
1316                 if (ret)
1317                         return ret;
1318         } else {
1319                 /* Purge and reset type-dependent state. */
1320                 ieee80211_teardown_sdata(sdata);
1321                 ieee80211_setup_sdata(sdata, type);
1322         }
1323
1324         /* reset some values that shouldn't be kept across type changes */
1325         sdata->drop_unencrypted = 0;
1326         if (type == NL80211_IFTYPE_STATION)
1327                 sdata->u.mgd.use_4addr = false;
1328
1329         return 0;
1330 }
1331
1332 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1333                                        u8 *perm_addr, enum nl80211_iftype type)
1334 {
1335         struct ieee80211_sub_if_data *sdata;
1336         u64 mask, start, addr, val, inc;
1337         u8 *m;
1338         u8 tmp_addr[ETH_ALEN];
1339         int i;
1340
1341         /* default ... something at least */
1342         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1343
1344         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1345             local->hw.wiphy->n_addresses <= 1)
1346                 return;
1347
1348         mutex_lock(&local->iflist_mtx);
1349
1350         switch (type) {
1351         case NL80211_IFTYPE_MONITOR:
1352                 /* doesn't matter */
1353                 break;
1354         case NL80211_IFTYPE_WDS:
1355         case NL80211_IFTYPE_AP_VLAN:
1356                 /* match up with an AP interface */
1357                 list_for_each_entry(sdata, &local->interfaces, list) {
1358                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1359                                 continue;
1360                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1361                         break;
1362                 }
1363                 /* keep default if no AP interface present */
1364                 break;
1365         case NL80211_IFTYPE_P2P_CLIENT:
1366         case NL80211_IFTYPE_P2P_GO:
1367                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1368                         list_for_each_entry(sdata, &local->interfaces, list) {
1369                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1370                                         continue;
1371                                 if (!ieee80211_sdata_running(sdata))
1372                                         continue;
1373                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1374                                 goto out_unlock;
1375                         }
1376                 }
1377                 /* otherwise fall through */
1378         default:
1379                 /* assign a new address if possible -- try n_addresses first */
1380                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1381                         bool used = false;
1382
1383                         list_for_each_entry(sdata, &local->interfaces, list) {
1384                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1385                                            sdata->vif.addr, ETH_ALEN) == 0) {
1386                                         used = true;
1387                                         break;
1388                                 }
1389                         }
1390
1391                         if (!used) {
1392                                 memcpy(perm_addr,
1393                                        local->hw.wiphy->addresses[i].addr,
1394                                        ETH_ALEN);
1395                                 break;
1396                         }
1397                 }
1398
1399                 /* try mask if available */
1400                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1401                         break;
1402
1403                 m = local->hw.wiphy->addr_mask;
1404                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1405                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1406                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1407
1408                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1409                         /* not a contiguous mask ... not handled now! */
1410                         pr_info("not contiguous\n");
1411                         break;
1412                 }
1413
1414                 m = local->hw.wiphy->perm_addr;
1415                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1416                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1417                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1418
1419                 inc = 1ULL<<__ffs64(mask);
1420                 val = (start & mask);
1421                 addr = (start & ~mask) | (val & mask);
1422                 do {
1423                         bool used = false;
1424
1425                         tmp_addr[5] = addr >> 0*8;
1426                         tmp_addr[4] = addr >> 1*8;
1427                         tmp_addr[3] = addr >> 2*8;
1428                         tmp_addr[2] = addr >> 3*8;
1429                         tmp_addr[1] = addr >> 4*8;
1430                         tmp_addr[0] = addr >> 5*8;
1431
1432                         val += inc;
1433
1434                         list_for_each_entry(sdata, &local->interfaces, list) {
1435                                 if (memcmp(tmp_addr, sdata->vif.addr,
1436                                                         ETH_ALEN) == 0) {
1437                                         used = true;
1438                                         break;
1439                                 }
1440                         }
1441
1442                         if (!used) {
1443                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1444                                 break;
1445                         }
1446                         addr = (start & ~mask) | (val & mask);
1447                 } while (addr != start);
1448
1449                 break;
1450         }
1451
1452  out_unlock:
1453         mutex_unlock(&local->iflist_mtx);
1454 }
1455
1456 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1457 {
1458         struct ieee80211_sub_if_data *sdata;
1459
1460         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1461
1462         ieee80211_cleanup_sdata_stas(sdata);
1463 }
1464
1465 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1466                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1467                      struct vif_params *params)
1468 {
1469         struct net_device *ndev = NULL;
1470         struct ieee80211_sub_if_data *sdata = NULL;
1471         int ret, i;
1472         int txqs = 1;
1473
1474         ASSERT_RTNL();
1475
1476         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1477                 struct wireless_dev *wdev;
1478
1479                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1480                                 GFP_KERNEL);
1481                 if (!sdata)
1482                         return -ENOMEM;
1483                 wdev = &sdata->wdev;
1484
1485                 sdata->dev = NULL;
1486                 strlcpy(sdata->name, name, IFNAMSIZ);
1487                 ieee80211_assign_perm_addr(local, wdev->address, type);
1488                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1489         } else {
1490                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1491                         txqs = IEEE80211_NUM_ACS;
1492
1493                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1494                                         local->hw.vif_data_size,
1495                                         name, ieee80211_if_setup, txqs, 1);
1496                 if (!ndev)
1497                         return -ENOMEM;
1498                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1499
1500                 ndev->needed_headroom = local->tx_headroom +
1501                                         4*6 /* four MAC addresses */
1502                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1503                                         + 6 /* mesh */
1504                                         + 8 /* rfc1042/bridge tunnel */
1505                                         - ETH_HLEN /* ethernet hard_header_len */
1506                                         + IEEE80211_ENCRYPT_HEADROOM;
1507                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1508
1509                 ret = dev_alloc_name(ndev, ndev->name);
1510                 if (ret < 0) {
1511                         free_netdev(ndev);
1512                         return ret;
1513                 }
1514
1515                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1516                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1517                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1518
1519                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1520                 sdata = netdev_priv(ndev);
1521                 ndev->ieee80211_ptr = &sdata->wdev;
1522                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1523                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1524
1525                 sdata->dev = ndev;
1526         }
1527
1528         /* initialise type-independent data */
1529         sdata->wdev.wiphy = local->hw.wiphy;
1530         sdata->local = local;
1531
1532         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1533                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1534
1535         INIT_LIST_HEAD(&sdata->key_list);
1536
1537         spin_lock_init(&sdata->cleanup_stations_lock);
1538         INIT_LIST_HEAD(&sdata->cleanup_stations);
1539         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1540         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1541                           ieee80211_dfs_cac_timer_work);
1542
1543         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1544                 struct ieee80211_supported_band *sband;
1545                 sband = local->hw.wiphy->bands[i];
1546                 sdata->rc_rateidx_mask[i] =
1547                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1548                 if (sband)
1549                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1550                                sband->ht_cap.mcs.rx_mask,
1551                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1552                 else
1553                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1554                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1555         }
1556
1557         ieee80211_set_default_queues(sdata);
1558
1559         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1560         sdata->user_power_level = local->user_power_level;
1561
1562         /* setup type-dependent data */
1563         ieee80211_setup_sdata(sdata, type);
1564
1565         if (ndev) {
1566                 if (params) {
1567                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1568                         if (type == NL80211_IFTYPE_STATION)
1569                                 sdata->u.mgd.use_4addr = params->use_4addr;
1570                 }
1571
1572                 ndev->features |= local->hw.netdev_features;
1573
1574                 ret = register_netdevice(ndev);
1575                 if (ret) {
1576                         free_netdev(ndev);
1577                         return ret;
1578                 }
1579         }
1580
1581         mutex_lock(&local->iflist_mtx);
1582         list_add_tail_rcu(&sdata->list, &local->interfaces);
1583         mutex_unlock(&local->iflist_mtx);
1584
1585         if (new_wdev)
1586                 *new_wdev = &sdata->wdev;
1587
1588         return 0;
1589 }
1590
1591 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1592 {
1593         ASSERT_RTNL();
1594
1595         mutex_lock(&sdata->local->iflist_mtx);
1596         list_del_rcu(&sdata->list);
1597         mutex_unlock(&sdata->local->iflist_mtx);
1598
1599         synchronize_rcu();
1600
1601         if (sdata->dev) {
1602                 unregister_netdevice(sdata->dev);
1603         } else {
1604                 cfg80211_unregister_wdev(&sdata->wdev);
1605                 kfree(sdata);
1606         }
1607 }
1608
1609 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1610 {
1611         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1612                 return;
1613         ieee80211_do_stop(sdata, true);
1614         ieee80211_teardown_sdata(sdata);
1615 }
1616
1617 /*
1618  * Remove all interfaces, may only be called at hardware unregistration
1619  * time because it doesn't do RCU-safe list removals.
1620  */
1621 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1622 {
1623         struct ieee80211_sub_if_data *sdata, *tmp;
1624         LIST_HEAD(unreg_list);
1625         LIST_HEAD(wdev_list);
1626
1627         ASSERT_RTNL();
1628
1629         mutex_lock(&local->iflist_mtx);
1630         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1631                 list_del(&sdata->list);
1632
1633                 if (sdata->dev)
1634                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1635                 else
1636                         list_add(&sdata->list, &wdev_list);
1637         }
1638         mutex_unlock(&local->iflist_mtx);
1639         unregister_netdevice_many(&unreg_list);
1640         list_del(&unreg_list);
1641
1642         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1643                 list_del(&sdata->list);
1644                 cfg80211_unregister_wdev(&sdata->wdev);
1645                 kfree(sdata);
1646         }
1647 }
1648
1649 static int netdev_notify(struct notifier_block *nb,
1650                          unsigned long state,
1651                          void *ndev)
1652 {
1653         struct net_device *dev = ndev;
1654         struct ieee80211_sub_if_data *sdata;
1655
1656         if (state != NETDEV_CHANGENAME)
1657                 return 0;
1658
1659         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1660                 return 0;
1661
1662         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1663                 return 0;
1664
1665         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1666
1667         memcpy(sdata->name, dev->name, IFNAMSIZ);
1668
1669         ieee80211_debugfs_rename_netdev(sdata);
1670         return 0;
1671 }
1672
1673 static struct notifier_block mac80211_netdev_notifier = {
1674         .notifier_call = netdev_notify,
1675 };
1676
1677 int ieee80211_iface_init(void)
1678 {
1679         return register_netdevice_notifier(&mac80211_netdev_notifier);
1680 }
1681
1682 void ieee80211_iface_exit(void)
1683 {
1684         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1685 }