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) 2018-2021 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.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->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 64 power = min(power, sdata->user_power_level); 65 66 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 67 power = min(power, sdata->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_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 84 } 85 86 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 87 { 88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 89 return 0; 90 91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 92 return IEEE80211_CONF_CHANGE_IDLE; 93 } 94 95 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 96 { 97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 98 return 0; 99 100 ieee80211_flush_queues(local, NULL, false); 101 102 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 103 return IEEE80211_CONF_CHANGE_IDLE; 104 } 105 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 107 bool force_active) 108 { 109 bool working, scanning, active; 110 unsigned int led_trig_start = 0, led_trig_stop = 0; 111 112 lockdep_assert_held(&local->mtx); 113 114 active = force_active || 115 !list_empty(&local->chanctx_list) || 116 local->monitors; 117 118 working = !local->ops->remain_on_channel && 119 !list_empty(&local->roc_list); 120 121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 123 124 if (working || scanning) 125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 else 127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 128 129 if (active) 130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 else 132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 133 134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 135 136 if (working || scanning || active) 137 return __ieee80211_idle_off(local); 138 return __ieee80211_idle_on(local); 139 } 140 141 u32 ieee80211_idle_off(struct ieee80211_local *local) 142 { 143 return __ieee80211_recalc_idle(local, true); 144 } 145 146 void ieee80211_recalc_idle(struct ieee80211_local *local) 147 { 148 u32 change = __ieee80211_recalc_idle(local, false); 149 if (change) 150 ieee80211_hw_config(local, change); 151 } 152 153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 154 bool check_dup) 155 { 156 struct ieee80211_local *local = sdata->local; 157 struct ieee80211_sub_if_data *iter; 158 u64 new, mask, tmp; 159 u8 *m; 160 int ret = 0; 161 162 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 163 return 0; 164 165 m = addr; 166 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 167 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 168 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 169 170 m = local->hw.wiphy->addr_mask; 171 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 174 175 if (!check_dup) 176 return ret; 177 178 mutex_lock(&local->iflist_mtx); 179 list_for_each_entry(iter, &local->interfaces, list) { 180 if (iter == sdata) 181 continue; 182 183 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 184 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 185 continue; 186 187 m = iter->vif.addr; 188 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 189 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 190 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 191 192 if ((new & ~mask) != (tmp & ~mask)) { 193 ret = -EINVAL; 194 break; 195 } 196 } 197 mutex_unlock(&local->iflist_mtx); 198 199 return ret; 200 } 201 202 static int ieee80211_change_mac(struct net_device *dev, void *addr) 203 { 204 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 205 struct sockaddr *sa = addr; 206 bool check_dup = true; 207 int ret; 208 209 if (ieee80211_sdata_running(sdata)) 210 return -EBUSY; 211 212 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 213 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 214 check_dup = false; 215 216 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 217 if (ret) 218 return ret; 219 220 ret = eth_mac_addr(dev, sa); 221 222 if (ret == 0) 223 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 224 225 return ret; 226 } 227 228 static inline int identical_mac_addr_allowed(int type1, int type2) 229 { 230 return type1 == NL80211_IFTYPE_MONITOR || 231 type2 == NL80211_IFTYPE_MONITOR || 232 type1 == NL80211_IFTYPE_P2P_DEVICE || 233 type2 == NL80211_IFTYPE_P2P_DEVICE || 234 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 235 (type1 == NL80211_IFTYPE_AP_VLAN && 236 (type2 == NL80211_IFTYPE_AP || 237 type2 == NL80211_IFTYPE_AP_VLAN)); 238 } 239 240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 241 enum nl80211_iftype iftype) 242 { 243 struct ieee80211_local *local = sdata->local; 244 struct ieee80211_sub_if_data *nsdata; 245 int ret; 246 247 ASSERT_RTNL(); 248 249 /* we hold the RTNL here so can safely walk the list */ 250 list_for_each_entry(nsdata, &local->interfaces, list) { 251 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 252 /* 253 * Only OCB and monitor mode may coexist 254 */ 255 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 256 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 257 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 258 nsdata->vif.type == NL80211_IFTYPE_OCB)) 259 return -EBUSY; 260 261 /* 262 * Allow only a single IBSS interface to be up at any 263 * time. This is restricted because beacon distribution 264 * cannot work properly if both are in the same IBSS. 265 * 266 * To remove this restriction we'd have to disallow them 267 * from setting the same SSID on different IBSS interfaces 268 * belonging to the same hardware. Then, however, we're 269 * faced with having to adopt two different TSF timers... 270 */ 271 if (iftype == NL80211_IFTYPE_ADHOC && 272 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 273 return -EBUSY; 274 /* 275 * will not add another interface while any channel 276 * switch is active. 277 */ 278 if (nsdata->vif.csa_active) 279 return -EBUSY; 280 281 /* 282 * The remaining checks are only performed for interfaces 283 * with the same MAC address. 284 */ 285 if (!ether_addr_equal(sdata->vif.addr, 286 nsdata->vif.addr)) 287 continue; 288 289 /* 290 * check whether it may have the same address 291 */ 292 if (!identical_mac_addr_allowed(iftype, 293 nsdata->vif.type)) 294 return -ENOTUNIQ; 295 296 /* 297 * can only add VLANs to enabled APs 298 */ 299 if (iftype == NL80211_IFTYPE_AP_VLAN && 300 nsdata->vif.type == NL80211_IFTYPE_AP) 301 sdata->bss = &nsdata->u.ap; 302 } 303 } 304 305 mutex_lock(&local->chanctx_mtx); 306 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 307 mutex_unlock(&local->chanctx_mtx); 308 return ret; 309 } 310 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 312 enum nl80211_iftype iftype) 313 { 314 int n_queues = sdata->local->hw.queues; 315 int i; 316 317 if (iftype == NL80211_IFTYPE_NAN) 318 return 0; 319 320 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 321 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 323 IEEE80211_INVAL_HW_QUEUE)) 324 return -EINVAL; 325 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 326 n_queues)) 327 return -EINVAL; 328 } 329 } 330 331 if ((iftype != NL80211_IFTYPE_AP && 332 iftype != NL80211_IFTYPE_P2P_GO && 333 iftype != NL80211_IFTYPE_MESH_POINT) || 334 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 335 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 336 return 0; 337 } 338 339 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 340 return -EINVAL; 341 342 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 343 return -EINVAL; 344 345 return 0; 346 } 347 348 static int ieee80211_open(struct net_device *dev) 349 { 350 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 351 int err; 352 353 /* fail early if user set an invalid address */ 354 if (!is_valid_ether_addr(dev->dev_addr)) 355 return -EADDRNOTAVAIL; 356 357 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 358 if (err) 359 return err; 360 361 wiphy_lock(sdata->local->hw.wiphy); 362 err = ieee80211_do_open(&sdata->wdev, true); 363 wiphy_unlock(sdata->local->hw.wiphy); 364 365 return err; 366 } 367 368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 369 { 370 struct ieee80211_local *local = sdata->local; 371 unsigned long flags; 372 struct sk_buff *skb, *tmp; 373 u32 hw_reconf_flags = 0; 374 int i, flushed; 375 struct ps_data *ps; 376 struct cfg80211_chan_def chandef; 377 bool cancel_scan; 378 struct cfg80211_nan_func *func; 379 380 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 381 382 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 383 if (cancel_scan) 384 ieee80211_scan_cancel(local); 385 386 /* 387 * Stop TX on this interface first. 388 */ 389 if (sdata->dev) 390 netif_tx_stop_all_queues(sdata->dev); 391 392 ieee80211_roc_purge(local, sdata); 393 394 switch (sdata->vif.type) { 395 case NL80211_IFTYPE_STATION: 396 ieee80211_mgd_stop(sdata); 397 break; 398 case NL80211_IFTYPE_ADHOC: 399 ieee80211_ibss_stop(sdata); 400 break; 401 case NL80211_IFTYPE_MONITOR: 402 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 403 break; 404 list_del_rcu(&sdata->u.mntr.list); 405 break; 406 default: 407 break; 408 } 409 410 /* 411 * Remove all stations associated with this interface. 412 * 413 * This must be done before calling ops->remove_interface() 414 * because otherwise we can later invoke ops->sta_notify() 415 * whenever the STAs are removed, and that invalidates driver 416 * assumptions about always getting a vif pointer that is valid 417 * (because if we remove a STA after ops->remove_interface() 418 * the driver will have removed the vif info already!) 419 * 420 * For AP_VLANs stations may exist since there's nothing else that 421 * would have removed them, but in other modes there shouldn't 422 * be any stations. 423 */ 424 flushed = sta_info_flush(sdata); 425 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 426 427 /* don't count this interface for allmulti while it is down */ 428 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 429 atomic_dec(&local->iff_allmultis); 430 431 if (sdata->vif.type == NL80211_IFTYPE_AP) { 432 local->fif_pspoll--; 433 local->fif_probe_req--; 434 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 435 local->fif_probe_req--; 436 } 437 438 if (sdata->dev) { 439 netif_addr_lock_bh(sdata->dev); 440 spin_lock_bh(&local->filter_lock); 441 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 442 sdata->dev->addr_len); 443 spin_unlock_bh(&local->filter_lock); 444 netif_addr_unlock_bh(sdata->dev); 445 } 446 447 del_timer_sync(&local->dynamic_ps_timer); 448 cancel_work_sync(&local->dynamic_ps_enable_work); 449 450 cancel_work_sync(&sdata->recalc_smps); 451 sdata_lock(sdata); 452 mutex_lock(&local->mtx); 453 sdata->vif.csa_active = false; 454 if (sdata->vif.type == NL80211_IFTYPE_STATION) 455 sdata->u.mgd.csa_waiting_bcn = false; 456 if (sdata->csa_block_tx) { 457 ieee80211_wake_vif_queues(local, sdata, 458 IEEE80211_QUEUE_STOP_REASON_CSA); 459 sdata->csa_block_tx = false; 460 } 461 mutex_unlock(&local->mtx); 462 sdata_unlock(sdata); 463 464 cancel_work_sync(&sdata->csa_finalize_work); 465 cancel_work_sync(&sdata->color_change_finalize_work); 466 467 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 468 469 if (sdata->wdev.cac_started) { 470 chandef = sdata->vif.bss_conf.chandef; 471 WARN_ON(local->suspended); 472 mutex_lock(&local->mtx); 473 ieee80211_vif_release_channel(sdata); 474 mutex_unlock(&local->mtx); 475 cfg80211_cac_event(sdata->dev, &chandef, 476 NL80211_RADAR_CAC_ABORTED, 477 GFP_KERNEL); 478 } 479 480 if (sdata->vif.type == NL80211_IFTYPE_AP) { 481 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 482 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 483 /* remove all packets in parent bc_buf pointing to this dev */ 484 ps = &sdata->bss->ps; 485 486 spin_lock_irqsave(&ps->bc_buf.lock, flags); 487 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 488 if (skb->dev == sdata->dev) { 489 __skb_unlink(skb, &ps->bc_buf); 490 local->total_ps_buffered--; 491 ieee80211_free_txskb(&local->hw, skb); 492 } 493 } 494 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 495 } 496 497 if (going_down) 498 local->open_count--; 499 500 switch (sdata->vif.type) { 501 case NL80211_IFTYPE_AP_VLAN: 502 mutex_lock(&local->mtx); 503 list_del(&sdata->u.vlan.list); 504 mutex_unlock(&local->mtx); 505 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 506 /* see comment in the default case below */ 507 ieee80211_free_keys(sdata, true); 508 /* no need to tell driver */ 509 break; 510 case NL80211_IFTYPE_MONITOR: 511 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 512 local->cooked_mntrs--; 513 break; 514 } 515 516 local->monitors--; 517 if (local->monitors == 0) { 518 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 519 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 520 } 521 522 ieee80211_adjust_monitor_flags(sdata, -1); 523 break; 524 case NL80211_IFTYPE_NAN: 525 /* clean all the functions */ 526 spin_lock_bh(&sdata->u.nan.func_lock); 527 528 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 529 idr_remove(&sdata->u.nan.function_inst_ids, i); 530 cfg80211_free_nan_func(func); 531 } 532 idr_destroy(&sdata->u.nan.function_inst_ids); 533 534 spin_unlock_bh(&sdata->u.nan.func_lock); 535 break; 536 case NL80211_IFTYPE_P2P_DEVICE: 537 /* relies on synchronize_rcu() below */ 538 RCU_INIT_POINTER(local->p2p_sdata, NULL); 539 fallthrough; 540 default: 541 cancel_work_sync(&sdata->work); 542 /* 543 * When we get here, the interface is marked down. 544 * Free the remaining keys, if there are any 545 * (which can happen in AP mode if userspace sets 546 * keys before the interface is operating) 547 * 548 * Force the key freeing to always synchronize_net() 549 * to wait for the RX path in case it is using this 550 * interface enqueuing frames at this very time on 551 * another CPU. 552 */ 553 ieee80211_free_keys(sdata, true); 554 skb_queue_purge(&sdata->skb_queue); 555 skb_queue_purge(&sdata->status_queue); 556 } 557 558 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 559 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 560 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 561 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 562 if (info->control.vif == &sdata->vif) { 563 __skb_unlink(skb, &local->pending[i]); 564 ieee80211_free_txskb(&local->hw, skb); 565 } 566 } 567 } 568 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 569 570 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 571 ieee80211_txq_remove_vlan(local, sdata); 572 573 sdata->bss = NULL; 574 575 if (local->open_count == 0) 576 ieee80211_clear_tx_pending(local); 577 578 sdata->vif.bss_conf.beacon_int = 0; 579 580 /* 581 * If the interface goes down while suspended, presumably because 582 * the device was unplugged and that happens before our resume, 583 * then the driver is already unconfigured and the remainder of 584 * this function isn't needed. 585 * XXX: what about WoWLAN? If the device has software state, e.g. 586 * memory allocated, it might expect teardown commands from 587 * mac80211 here? 588 */ 589 if (local->suspended) { 590 WARN_ON(local->wowlan); 591 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 592 return; 593 } 594 595 switch (sdata->vif.type) { 596 case NL80211_IFTYPE_AP_VLAN: 597 break; 598 case NL80211_IFTYPE_MONITOR: 599 if (local->monitors == 0) 600 ieee80211_del_virtual_monitor(local); 601 602 mutex_lock(&local->mtx); 603 ieee80211_recalc_idle(local); 604 mutex_unlock(&local->mtx); 605 606 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 607 break; 608 609 fallthrough; 610 default: 611 if (going_down) 612 drv_remove_interface(local, sdata); 613 } 614 615 ieee80211_recalc_ps(local); 616 617 if (cancel_scan) 618 flush_delayed_work(&local->scan_work); 619 620 if (local->open_count == 0) { 621 ieee80211_stop_device(local); 622 623 /* no reconfiguring after stop! */ 624 return; 625 } 626 627 /* do after stop to avoid reconfiguring when we stop anyway */ 628 ieee80211_configure_filter(local); 629 ieee80211_hw_config(local, hw_reconf_flags); 630 631 if (local->monitors == local->open_count) 632 ieee80211_add_virtual_monitor(local); 633 } 634 635 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 636 { 637 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 638 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 639 640 if (!tx_vif) 641 return; 642 643 tx_sdata = vif_to_sdata(tx_vif); 644 sdata->vif.mbssid_tx_vif = NULL; 645 646 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 647 &tx_sdata->local->interfaces, list) { 648 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 649 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 650 ieee80211_sdata_running(non_tx_sdata)) { 651 non_tx_sdata->vif.mbssid_tx_vif = NULL; 652 dev_close(non_tx_sdata->wdev.netdev); 653 } 654 } 655 656 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 657 tx_sdata->vif.mbssid_tx_vif = NULL; 658 dev_close(tx_sdata->wdev.netdev); 659 } 660 } 661 662 static int ieee80211_stop(struct net_device *dev) 663 { 664 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 665 666 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 667 if (sdata->vif.type == NL80211_IFTYPE_AP) { 668 struct ieee80211_sub_if_data *vlan, *tmpsdata; 669 670 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 671 u.vlan.list) 672 dev_close(vlan->dev); 673 674 ieee80211_stop_mbssid(sdata); 675 } 676 677 wiphy_lock(sdata->local->hw.wiphy); 678 ieee80211_do_stop(sdata, true); 679 wiphy_unlock(sdata->local->hw.wiphy); 680 681 return 0; 682 } 683 684 static void ieee80211_set_multicast_list(struct net_device *dev) 685 { 686 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 687 struct ieee80211_local *local = sdata->local; 688 int allmulti, sdata_allmulti; 689 690 allmulti = !!(dev->flags & IFF_ALLMULTI); 691 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 692 693 if (allmulti != sdata_allmulti) { 694 if (dev->flags & IFF_ALLMULTI) 695 atomic_inc(&local->iff_allmultis); 696 else 697 atomic_dec(&local->iff_allmultis); 698 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 699 } 700 701 spin_lock_bh(&local->filter_lock); 702 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 703 spin_unlock_bh(&local->filter_lock); 704 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 705 } 706 707 /* 708 * Called when the netdev is removed or, by the code below, before 709 * the interface type changes. 710 */ 711 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 712 { 713 /* free extra data */ 714 ieee80211_free_keys(sdata, false); 715 716 ieee80211_debugfs_remove_netdev(sdata); 717 718 ieee80211_destroy_frag_cache(&sdata->frags); 719 720 if (ieee80211_vif_is_mesh(&sdata->vif)) 721 ieee80211_mesh_teardown_sdata(sdata); 722 } 723 724 static void ieee80211_uninit(struct net_device *dev) 725 { 726 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 727 } 728 729 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 730 struct sk_buff *skb, 731 struct net_device *sb_dev) 732 { 733 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 734 } 735 736 static void 737 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 738 { 739 dev_fetch_sw_netstats(stats, dev->tstats); 740 } 741 742 static const struct net_device_ops ieee80211_dataif_ops = { 743 .ndo_open = ieee80211_open, 744 .ndo_stop = ieee80211_stop, 745 .ndo_uninit = ieee80211_uninit, 746 .ndo_start_xmit = ieee80211_subif_start_xmit, 747 .ndo_set_rx_mode = ieee80211_set_multicast_list, 748 .ndo_set_mac_address = ieee80211_change_mac, 749 .ndo_select_queue = ieee80211_netdev_select_queue, 750 .ndo_get_stats64 = ieee80211_get_stats64, 751 }; 752 753 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 754 struct sk_buff *skb, 755 struct net_device *sb_dev) 756 { 757 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 758 struct ieee80211_local *local = sdata->local; 759 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 760 struct ieee80211_hdr *hdr; 761 int len_rthdr; 762 763 if (local->hw.queues < IEEE80211_NUM_ACS) 764 return 0; 765 766 /* reset flags and info before parsing radiotap header */ 767 memset(info, 0, sizeof(*info)); 768 769 if (!ieee80211_parse_tx_radiotap(skb, dev)) 770 return 0; /* doesn't matter, frame will be dropped */ 771 772 len_rthdr = ieee80211_get_radiotap_len(skb->data); 773 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 774 if (skb->len < len_rthdr + 2 || 775 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 776 return 0; /* doesn't matter, frame will be dropped */ 777 778 return ieee80211_select_queue_80211(sdata, skb, hdr); 779 } 780 781 static const struct net_device_ops ieee80211_monitorif_ops = { 782 .ndo_open = ieee80211_open, 783 .ndo_stop = ieee80211_stop, 784 .ndo_uninit = ieee80211_uninit, 785 .ndo_start_xmit = ieee80211_monitor_start_xmit, 786 .ndo_set_rx_mode = ieee80211_set_multicast_list, 787 .ndo_set_mac_address = ieee80211_change_mac, 788 .ndo_select_queue = ieee80211_monitor_select_queue, 789 .ndo_get_stats64 = ieee80211_get_stats64, 790 }; 791 792 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 793 struct net_device_path *path) 794 { 795 struct ieee80211_sub_if_data *sdata; 796 struct ieee80211_local *local; 797 struct sta_info *sta; 798 int ret = -ENOENT; 799 800 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 801 local = sdata->local; 802 803 if (!local->ops->net_fill_forward_path) 804 return -EOPNOTSUPP; 805 806 rcu_read_lock(); 807 switch (sdata->vif.type) { 808 case NL80211_IFTYPE_AP_VLAN: 809 sta = rcu_dereference(sdata->u.vlan.sta); 810 if (sta) 811 break; 812 if (sdata->wdev.use_4addr) 813 goto out; 814 if (is_multicast_ether_addr(ctx->daddr)) 815 goto out; 816 sta = sta_info_get_bss(sdata, ctx->daddr); 817 break; 818 case NL80211_IFTYPE_AP: 819 if (is_multicast_ether_addr(ctx->daddr)) 820 goto out; 821 sta = sta_info_get(sdata, ctx->daddr); 822 break; 823 case NL80211_IFTYPE_STATION: 824 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 825 sta = sta_info_get(sdata, ctx->daddr); 826 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 827 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 828 goto out; 829 830 break; 831 } 832 } 833 834 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 835 break; 836 default: 837 goto out; 838 } 839 840 if (!sta) 841 goto out; 842 843 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 844 out: 845 rcu_read_unlock(); 846 847 return ret; 848 } 849 850 static const struct net_device_ops ieee80211_dataif_8023_ops = { 851 .ndo_open = ieee80211_open, 852 .ndo_stop = ieee80211_stop, 853 .ndo_uninit = ieee80211_uninit, 854 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 855 .ndo_set_rx_mode = ieee80211_set_multicast_list, 856 .ndo_set_mac_address = ieee80211_change_mac, 857 .ndo_select_queue = ieee80211_netdev_select_queue, 858 .ndo_get_stats64 = ieee80211_get_stats64, 859 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 860 }; 861 862 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 863 { 864 switch (iftype) { 865 /* P2P GO and client are mapped to AP/STATION types */ 866 case NL80211_IFTYPE_AP: 867 case NL80211_IFTYPE_STATION: 868 return true; 869 default: 870 return false; 871 } 872 } 873 874 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 875 { 876 struct ieee80211_local *local = sdata->local; 877 u32 flags; 878 879 flags = sdata->vif.offload_flags; 880 881 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 882 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 883 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 884 885 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 886 local->hw.wiphy->frag_threshold != (u32)-1) 887 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 888 889 if (local->monitors) 890 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 891 } else { 892 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 893 } 894 895 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 896 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 897 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 898 899 if (local->monitors && 900 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 901 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 902 } else { 903 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 904 } 905 906 if (sdata->vif.offload_flags == flags) 907 return false; 908 909 sdata->vif.offload_flags = flags; 910 ieee80211_check_fast_rx_iface(sdata); 911 return true; 912 } 913 914 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 915 { 916 struct ieee80211_local *local = sdata->local; 917 struct ieee80211_sub_if_data *bss = sdata; 918 bool enabled; 919 920 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 921 if (!sdata->bss) 922 return; 923 924 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 925 } 926 927 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 928 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 929 return; 930 931 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 932 if (sdata->wdev.use_4addr && 933 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 934 enabled = false; 935 936 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 937 &ieee80211_dataif_ops; 938 } 939 940 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 941 { 942 struct ieee80211_local *local = sdata->local; 943 struct ieee80211_sub_if_data *vsdata; 944 945 if (ieee80211_set_sdata_offload_flags(sdata)) { 946 drv_update_vif_offload(local, sdata); 947 ieee80211_set_vif_encap_ops(sdata); 948 } 949 950 list_for_each_entry(vsdata, &local->interfaces, list) { 951 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 952 vsdata->bss != &sdata->u.ap) 953 continue; 954 955 ieee80211_set_vif_encap_ops(vsdata); 956 } 957 } 958 959 void ieee80211_recalc_offload(struct ieee80211_local *local) 960 { 961 struct ieee80211_sub_if_data *sdata; 962 963 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 964 return; 965 966 mutex_lock(&local->iflist_mtx); 967 968 list_for_each_entry(sdata, &local->interfaces, list) { 969 if (!ieee80211_sdata_running(sdata)) 970 continue; 971 972 ieee80211_recalc_sdata_offload(sdata); 973 } 974 975 mutex_unlock(&local->iflist_mtx); 976 } 977 978 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 979 const int offset) 980 { 981 struct ieee80211_local *local = sdata->local; 982 u32 flags = sdata->u.mntr.flags; 983 984 #define ADJUST(_f, _s) do { \ 985 if (flags & MONITOR_FLAG_##_f) \ 986 local->fif_##_s += offset; \ 987 } while (0) 988 989 ADJUST(FCSFAIL, fcsfail); 990 ADJUST(PLCPFAIL, plcpfail); 991 ADJUST(CONTROL, control); 992 ADJUST(CONTROL, pspoll); 993 ADJUST(OTHER_BSS, other_bss); 994 995 #undef ADJUST 996 } 997 998 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 999 { 1000 struct ieee80211_local *local = sdata->local; 1001 int i; 1002 1003 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1004 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1005 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1006 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1007 sdata->vif.hw_queue[i] = i; 1008 else 1009 sdata->vif.hw_queue[i] = 0; 1010 } 1011 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1012 } 1013 1014 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1015 { 1016 struct ieee80211_sub_if_data *sdata; 1017 int ret; 1018 1019 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1020 return 0; 1021 1022 ASSERT_RTNL(); 1023 lockdep_assert_wiphy(local->hw.wiphy); 1024 1025 if (local->monitor_sdata) 1026 return 0; 1027 1028 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1029 if (!sdata) 1030 return -ENOMEM; 1031 1032 /* set up data */ 1033 sdata->local = local; 1034 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1035 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1036 wiphy_name(local->hw.wiphy)); 1037 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1038 1039 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1040 1041 ieee80211_set_default_queues(sdata); 1042 1043 ret = drv_add_interface(local, sdata); 1044 if (WARN_ON(ret)) { 1045 /* ok .. stupid driver, it asked for this! */ 1046 kfree(sdata); 1047 return ret; 1048 } 1049 1050 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1051 1052 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1053 if (ret) { 1054 kfree(sdata); 1055 return ret; 1056 } 1057 1058 mutex_lock(&local->iflist_mtx); 1059 rcu_assign_pointer(local->monitor_sdata, sdata); 1060 mutex_unlock(&local->iflist_mtx); 1061 1062 mutex_lock(&local->mtx); 1063 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 1064 IEEE80211_CHANCTX_EXCLUSIVE); 1065 mutex_unlock(&local->mtx); 1066 if (ret) { 1067 mutex_lock(&local->iflist_mtx); 1068 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1069 mutex_unlock(&local->iflist_mtx); 1070 synchronize_net(); 1071 drv_remove_interface(local, sdata); 1072 kfree(sdata); 1073 return ret; 1074 } 1075 1076 skb_queue_head_init(&sdata->skb_queue); 1077 skb_queue_head_init(&sdata->status_queue); 1078 INIT_WORK(&sdata->work, ieee80211_iface_work); 1079 1080 return 0; 1081 } 1082 1083 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1084 { 1085 struct ieee80211_sub_if_data *sdata; 1086 1087 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1088 return; 1089 1090 ASSERT_RTNL(); 1091 lockdep_assert_wiphy(local->hw.wiphy); 1092 1093 mutex_lock(&local->iflist_mtx); 1094 1095 sdata = rcu_dereference_protected(local->monitor_sdata, 1096 lockdep_is_held(&local->iflist_mtx)); 1097 if (!sdata) { 1098 mutex_unlock(&local->iflist_mtx); 1099 return; 1100 } 1101 1102 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1103 mutex_unlock(&local->iflist_mtx); 1104 1105 synchronize_net(); 1106 1107 mutex_lock(&local->mtx); 1108 ieee80211_vif_release_channel(sdata); 1109 mutex_unlock(&local->mtx); 1110 1111 drv_remove_interface(local, sdata); 1112 1113 kfree(sdata); 1114 } 1115 1116 /* 1117 * NOTE: Be very careful when changing this function, it must NOT return 1118 * an error on interface type changes that have been pre-checked, so most 1119 * checks should be in ieee80211_check_concurrent_iface. 1120 */ 1121 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1122 { 1123 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1124 struct net_device *dev = wdev->netdev; 1125 struct ieee80211_local *local = sdata->local; 1126 u32 changed = 0; 1127 int res; 1128 u32 hw_reconf_flags = 0; 1129 1130 switch (sdata->vif.type) { 1131 case NL80211_IFTYPE_AP_VLAN: { 1132 struct ieee80211_sub_if_data *master; 1133 1134 if (!sdata->bss) 1135 return -ENOLINK; 1136 1137 mutex_lock(&local->mtx); 1138 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1139 mutex_unlock(&local->mtx); 1140 1141 master = container_of(sdata->bss, 1142 struct ieee80211_sub_if_data, u.ap); 1143 sdata->control_port_protocol = 1144 master->control_port_protocol; 1145 sdata->control_port_no_encrypt = 1146 master->control_port_no_encrypt; 1147 sdata->control_port_over_nl80211 = 1148 master->control_port_over_nl80211; 1149 sdata->control_port_no_preauth = 1150 master->control_port_no_preauth; 1151 sdata->vif.cab_queue = master->vif.cab_queue; 1152 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1153 sizeof(sdata->vif.hw_queue)); 1154 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 1155 1156 mutex_lock(&local->key_mtx); 1157 sdata->crypto_tx_tailroom_needed_cnt += 1158 master->crypto_tx_tailroom_needed_cnt; 1159 mutex_unlock(&local->key_mtx); 1160 1161 break; 1162 } 1163 case NL80211_IFTYPE_AP: 1164 sdata->bss = &sdata->u.ap; 1165 break; 1166 case NL80211_IFTYPE_MESH_POINT: 1167 case NL80211_IFTYPE_STATION: 1168 case NL80211_IFTYPE_MONITOR: 1169 case NL80211_IFTYPE_ADHOC: 1170 case NL80211_IFTYPE_P2P_DEVICE: 1171 case NL80211_IFTYPE_OCB: 1172 case NL80211_IFTYPE_NAN: 1173 /* no special treatment */ 1174 break; 1175 case NL80211_IFTYPE_UNSPECIFIED: 1176 case NUM_NL80211_IFTYPES: 1177 case NL80211_IFTYPE_P2P_CLIENT: 1178 case NL80211_IFTYPE_P2P_GO: 1179 case NL80211_IFTYPE_WDS: 1180 /* cannot happen */ 1181 WARN_ON(1); 1182 break; 1183 } 1184 1185 if (local->open_count == 0) { 1186 res = drv_start(local); 1187 if (res) 1188 goto err_del_bss; 1189 /* we're brought up, everything changes */ 1190 hw_reconf_flags = ~0; 1191 ieee80211_led_radio(local, true); 1192 ieee80211_mod_tpt_led_trig(local, 1193 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1194 } 1195 1196 /* 1197 * Copy the hopefully now-present MAC address to 1198 * this interface, if it has the special null one. 1199 */ 1200 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1201 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1202 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1203 1204 if (!is_valid_ether_addr(dev->dev_addr)) { 1205 res = -EADDRNOTAVAIL; 1206 goto err_stop; 1207 } 1208 } 1209 1210 switch (sdata->vif.type) { 1211 case NL80211_IFTYPE_AP_VLAN: 1212 /* no need to tell driver, but set carrier and chanctx */ 1213 if (rtnl_dereference(sdata->bss->beacon)) { 1214 ieee80211_vif_vlan_copy_chanctx(sdata); 1215 netif_carrier_on(dev); 1216 ieee80211_set_vif_encap_ops(sdata); 1217 } else { 1218 netif_carrier_off(dev); 1219 } 1220 break; 1221 case NL80211_IFTYPE_MONITOR: 1222 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1223 local->cooked_mntrs++; 1224 break; 1225 } 1226 1227 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1228 res = drv_add_interface(local, sdata); 1229 if (res) 1230 goto err_stop; 1231 } else if (local->monitors == 0 && local->open_count == 0) { 1232 res = ieee80211_add_virtual_monitor(local); 1233 if (res) 1234 goto err_stop; 1235 } 1236 1237 /* must be before the call to ieee80211_configure_filter */ 1238 local->monitors++; 1239 if (local->monitors == 1) { 1240 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1241 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1242 } 1243 1244 ieee80211_adjust_monitor_flags(sdata, 1); 1245 ieee80211_configure_filter(local); 1246 ieee80211_recalc_offload(local); 1247 mutex_lock(&local->mtx); 1248 ieee80211_recalc_idle(local); 1249 mutex_unlock(&local->mtx); 1250 1251 netif_carrier_on(dev); 1252 break; 1253 default: 1254 if (coming_up) { 1255 ieee80211_del_virtual_monitor(local); 1256 ieee80211_set_sdata_offload_flags(sdata); 1257 1258 res = drv_add_interface(local, sdata); 1259 if (res) 1260 goto err_stop; 1261 1262 ieee80211_set_vif_encap_ops(sdata); 1263 res = ieee80211_check_queues(sdata, 1264 ieee80211_vif_type_p2p(&sdata->vif)); 1265 if (res) 1266 goto err_del_interface; 1267 } 1268 1269 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1270 local->fif_pspoll++; 1271 local->fif_probe_req++; 1272 1273 ieee80211_configure_filter(local); 1274 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1275 local->fif_probe_req++; 1276 } 1277 1278 if (sdata->vif.probe_req_reg) 1279 drv_config_iface_filter(local, sdata, 1280 FIF_PROBE_REQ, 1281 FIF_PROBE_REQ); 1282 1283 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1284 sdata->vif.type != NL80211_IFTYPE_NAN) 1285 changed |= ieee80211_reset_erp_info(sdata); 1286 ieee80211_bss_info_change_notify(sdata, changed); 1287 1288 switch (sdata->vif.type) { 1289 case NL80211_IFTYPE_STATION: 1290 case NL80211_IFTYPE_ADHOC: 1291 case NL80211_IFTYPE_AP: 1292 case NL80211_IFTYPE_MESH_POINT: 1293 case NL80211_IFTYPE_OCB: 1294 netif_carrier_off(dev); 1295 break; 1296 case NL80211_IFTYPE_P2P_DEVICE: 1297 case NL80211_IFTYPE_NAN: 1298 break; 1299 default: 1300 /* not reached */ 1301 WARN_ON(1); 1302 } 1303 1304 /* 1305 * Set default queue parameters so drivers don't 1306 * need to initialise the hardware if the hardware 1307 * doesn't start up with sane defaults. 1308 * Enable QoS for anything but station interfaces. 1309 */ 1310 ieee80211_set_wmm_default(sdata, true, 1311 sdata->vif.type != NL80211_IFTYPE_STATION); 1312 } 1313 1314 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1315 1316 switch (sdata->vif.type) { 1317 case NL80211_IFTYPE_P2P_DEVICE: 1318 rcu_assign_pointer(local->p2p_sdata, sdata); 1319 break; 1320 case NL80211_IFTYPE_MONITOR: 1321 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1322 break; 1323 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1324 break; 1325 default: 1326 break; 1327 } 1328 1329 /* 1330 * set_multicast_list will be invoked by the networking core 1331 * which will check whether any increments here were done in 1332 * error and sync them down to the hardware as filter flags. 1333 */ 1334 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1335 atomic_inc(&local->iff_allmultis); 1336 1337 if (coming_up) 1338 local->open_count++; 1339 1340 if (hw_reconf_flags) 1341 ieee80211_hw_config(local, hw_reconf_flags); 1342 1343 ieee80211_recalc_ps(local); 1344 1345 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 1346 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1347 local->ops->wake_tx_queue) { 1348 /* XXX: for AP_VLAN, actually track AP queues */ 1349 if (dev) 1350 netif_tx_start_all_queues(dev); 1351 } else if (dev) { 1352 unsigned long flags; 1353 int n_acs = IEEE80211_NUM_ACS; 1354 int ac; 1355 1356 if (local->hw.queues < IEEE80211_NUM_ACS) 1357 n_acs = 1; 1358 1359 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1360 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 1361 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 1362 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 1363 for (ac = 0; ac < n_acs; ac++) { 1364 int ac_queue = sdata->vif.hw_queue[ac]; 1365 1366 if (local->queue_stop_reasons[ac_queue] == 0 && 1367 skb_queue_empty(&local->pending[ac_queue])) 1368 netif_start_subqueue(dev, ac); 1369 } 1370 } 1371 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1372 } 1373 1374 return 0; 1375 err_del_interface: 1376 drv_remove_interface(local, sdata); 1377 err_stop: 1378 if (!local->open_count) 1379 drv_stop(local); 1380 err_del_bss: 1381 sdata->bss = NULL; 1382 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1383 mutex_lock(&local->mtx); 1384 list_del(&sdata->u.vlan.list); 1385 mutex_unlock(&local->mtx); 1386 } 1387 /* might already be clear but that doesn't matter */ 1388 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1389 return res; 1390 } 1391 1392 static void ieee80211_if_free(struct net_device *dev) 1393 { 1394 free_percpu(dev->tstats); 1395 } 1396 1397 static void ieee80211_if_setup(struct net_device *dev) 1398 { 1399 ether_setup(dev); 1400 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1401 dev->netdev_ops = &ieee80211_dataif_ops; 1402 dev->needs_free_netdev = true; 1403 dev->priv_destructor = ieee80211_if_free; 1404 } 1405 1406 static void ieee80211_if_setup_no_queue(struct net_device *dev) 1407 { 1408 ieee80211_if_setup(dev); 1409 dev->priv_flags |= IFF_NO_QUEUE; 1410 } 1411 1412 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1413 struct ieee80211_sub_if_data *sdata, 1414 struct sk_buff *skb) 1415 { 1416 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1417 1418 if (ieee80211_is_action(mgmt->frame_control) && 1419 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1420 struct sta_info *sta; 1421 int len = skb->len; 1422 1423 mutex_lock(&local->sta_mtx); 1424 sta = sta_info_get_bss(sdata, mgmt->sa); 1425 if (sta) { 1426 switch (mgmt->u.action.u.addba_req.action_code) { 1427 case WLAN_ACTION_ADDBA_REQ: 1428 ieee80211_process_addba_request(local, sta, 1429 mgmt, len); 1430 break; 1431 case WLAN_ACTION_ADDBA_RESP: 1432 ieee80211_process_addba_resp(local, sta, 1433 mgmt, len); 1434 break; 1435 case WLAN_ACTION_DELBA: 1436 ieee80211_process_delba(sdata, sta, 1437 mgmt, len); 1438 break; 1439 default: 1440 WARN_ON(1); 1441 break; 1442 } 1443 } 1444 mutex_unlock(&local->sta_mtx); 1445 } else if (ieee80211_is_action(mgmt->frame_control) && 1446 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1447 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1448 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1449 struct ieee80211_rx_status *status; 1450 enum nl80211_band band; 1451 struct sta_info *sta; 1452 u8 opmode; 1453 1454 status = IEEE80211_SKB_RXCB(skb); 1455 band = status->band; 1456 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1457 1458 mutex_lock(&local->sta_mtx); 1459 sta = sta_info_get_bss(sdata, mgmt->sa); 1460 1461 if (sta) 1462 ieee80211_vht_handle_opmode(sdata, sta, opmode, 1463 band); 1464 1465 mutex_unlock(&local->sta_mtx); 1466 break; 1467 } 1468 case WLAN_VHT_ACTION_GROUPID_MGMT: 1469 ieee80211_process_mu_groups(sdata, mgmt); 1470 break; 1471 default: 1472 WARN_ON(1); 1473 break; 1474 } 1475 } else if (ieee80211_is_action(mgmt->frame_control) && 1476 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1477 switch (mgmt->u.action.u.s1g.action_code) { 1478 case WLAN_S1G_TWT_TEARDOWN: 1479 case WLAN_S1G_TWT_SETUP: 1480 ieee80211_s1g_rx_twt_action(sdata, skb); 1481 break; 1482 default: 1483 break; 1484 } 1485 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1486 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1487 ieee80211_sta_rx_queued_ext(sdata, skb); 1488 else 1489 WARN_ON(1); 1490 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1491 struct ieee80211_hdr *hdr = (void *)mgmt; 1492 struct sta_info *sta; 1493 1494 /* 1495 * So the frame isn't mgmt, but frame_control 1496 * is at the right place anyway, of course, so 1497 * the if statement is correct. 1498 * 1499 * Warn if we have other data frame types here, 1500 * they must not get here. 1501 */ 1502 WARN_ON(hdr->frame_control & 1503 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1504 WARN_ON(!(hdr->seq_ctrl & 1505 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1506 /* 1507 * This was a fragment of a frame, received while 1508 * a block-ack session was active. That cannot be 1509 * right, so terminate the session. 1510 */ 1511 mutex_lock(&local->sta_mtx); 1512 sta = sta_info_get_bss(sdata, mgmt->sa); 1513 if (sta) { 1514 u16 tid = ieee80211_get_tid(hdr); 1515 1516 __ieee80211_stop_rx_ba_session( 1517 sta, tid, WLAN_BACK_RECIPIENT, 1518 WLAN_REASON_QSTA_REQUIRE_SETUP, 1519 true); 1520 } 1521 mutex_unlock(&local->sta_mtx); 1522 } else switch (sdata->vif.type) { 1523 case NL80211_IFTYPE_STATION: 1524 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1525 break; 1526 case NL80211_IFTYPE_ADHOC: 1527 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1528 break; 1529 case NL80211_IFTYPE_MESH_POINT: 1530 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1531 break; 1532 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1533 break; 1534 default: 1535 WARN(1, "frame for unexpected interface type"); 1536 break; 1537 } 1538 } 1539 1540 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1541 struct sk_buff *skb) 1542 { 1543 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1544 1545 if (ieee80211_is_action(mgmt->frame_control) && 1546 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1547 switch (mgmt->u.action.u.s1g.action_code) { 1548 case WLAN_S1G_TWT_TEARDOWN: 1549 case WLAN_S1G_TWT_SETUP: 1550 ieee80211_s1g_status_twt_action(sdata, skb); 1551 break; 1552 default: 1553 break; 1554 } 1555 } 1556 } 1557 1558 static void ieee80211_iface_work(struct work_struct *work) 1559 { 1560 struct ieee80211_sub_if_data *sdata = 1561 container_of(work, struct ieee80211_sub_if_data, work); 1562 struct ieee80211_local *local = sdata->local; 1563 struct sk_buff *skb; 1564 1565 if (!ieee80211_sdata_running(sdata)) 1566 return; 1567 1568 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1569 return; 1570 1571 if (!ieee80211_can_run_worker(local)) 1572 return; 1573 1574 /* first process frames */ 1575 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1576 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1577 1578 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1579 ieee80211_process_tdls_channel_switch(sdata, skb); 1580 else 1581 ieee80211_iface_process_skb(local, sdata, skb); 1582 1583 kfree_skb(skb); 1584 kcov_remote_stop(); 1585 } 1586 1587 /* process status queue */ 1588 while ((skb = skb_dequeue(&sdata->status_queue))) { 1589 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1590 1591 ieee80211_iface_process_status(sdata, skb); 1592 kfree_skb(skb); 1593 1594 kcov_remote_stop(); 1595 } 1596 1597 /* then other type-dependent work */ 1598 switch (sdata->vif.type) { 1599 case NL80211_IFTYPE_STATION: 1600 ieee80211_sta_work(sdata); 1601 break; 1602 case NL80211_IFTYPE_ADHOC: 1603 ieee80211_ibss_work(sdata); 1604 break; 1605 case NL80211_IFTYPE_MESH_POINT: 1606 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1607 break; 1608 ieee80211_mesh_work(sdata); 1609 break; 1610 case NL80211_IFTYPE_OCB: 1611 ieee80211_ocb_work(sdata); 1612 break; 1613 default: 1614 break; 1615 } 1616 } 1617 1618 static void ieee80211_recalc_smps_work(struct work_struct *work) 1619 { 1620 struct ieee80211_sub_if_data *sdata = 1621 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1622 1623 ieee80211_recalc_smps(sdata); 1624 } 1625 1626 /* 1627 * Helper function to initialise an interface to a specific type. 1628 */ 1629 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1630 enum nl80211_iftype type) 1631 { 1632 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1633 0xff, 0xff, 0xff}; 1634 1635 /* clear type-dependent union */ 1636 memset(&sdata->u, 0, sizeof(sdata->u)); 1637 1638 /* and set some type-dependent values */ 1639 sdata->vif.type = type; 1640 sdata->vif.p2p = false; 1641 sdata->wdev.iftype = type; 1642 1643 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1644 sdata->control_port_no_encrypt = false; 1645 sdata->control_port_over_nl80211 = false; 1646 sdata->control_port_no_preauth = false; 1647 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1648 sdata->vif.bss_conf.idle = true; 1649 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1650 1651 sdata->noack_map = 0; 1652 1653 /* only monitor/p2p-device differ */ 1654 if (sdata->dev) { 1655 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1656 sdata->dev->type = ARPHRD_ETHER; 1657 } 1658 1659 skb_queue_head_init(&sdata->skb_queue); 1660 skb_queue_head_init(&sdata->status_queue); 1661 INIT_WORK(&sdata->work, ieee80211_iface_work); 1662 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1663 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1664 INIT_WORK(&sdata->color_change_finalize_work, ieee80211_color_change_finalize_work); 1665 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1666 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1667 1668 switch (type) { 1669 case NL80211_IFTYPE_P2P_GO: 1670 type = NL80211_IFTYPE_AP; 1671 sdata->vif.type = type; 1672 sdata->vif.p2p = true; 1673 fallthrough; 1674 case NL80211_IFTYPE_AP: 1675 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1676 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1677 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1678 break; 1679 case NL80211_IFTYPE_P2P_CLIENT: 1680 type = NL80211_IFTYPE_STATION; 1681 sdata->vif.type = type; 1682 sdata->vif.p2p = true; 1683 fallthrough; 1684 case NL80211_IFTYPE_STATION: 1685 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1686 ieee80211_sta_setup_sdata(sdata); 1687 break; 1688 case NL80211_IFTYPE_OCB: 1689 sdata->vif.bss_conf.bssid = bssid_wildcard; 1690 ieee80211_ocb_setup_sdata(sdata); 1691 break; 1692 case NL80211_IFTYPE_ADHOC: 1693 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1694 ieee80211_ibss_setup_sdata(sdata); 1695 break; 1696 case NL80211_IFTYPE_MESH_POINT: 1697 if (ieee80211_vif_is_mesh(&sdata->vif)) 1698 ieee80211_mesh_init_sdata(sdata); 1699 break; 1700 case NL80211_IFTYPE_MONITOR: 1701 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1702 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1703 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1704 MONITOR_FLAG_OTHER_BSS; 1705 break; 1706 case NL80211_IFTYPE_NAN: 1707 idr_init(&sdata->u.nan.function_inst_ids); 1708 spin_lock_init(&sdata->u.nan.func_lock); 1709 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1710 break; 1711 case NL80211_IFTYPE_AP_VLAN: 1712 case NL80211_IFTYPE_P2P_DEVICE: 1713 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1714 break; 1715 case NL80211_IFTYPE_UNSPECIFIED: 1716 case NL80211_IFTYPE_WDS: 1717 case NUM_NL80211_IFTYPES: 1718 WARN_ON(1); 1719 break; 1720 } 1721 1722 ieee80211_debugfs_add_netdev(sdata); 1723 } 1724 1725 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1726 enum nl80211_iftype type) 1727 { 1728 struct ieee80211_local *local = sdata->local; 1729 int ret, err; 1730 enum nl80211_iftype internal_type = type; 1731 bool p2p = false; 1732 1733 ASSERT_RTNL(); 1734 1735 if (!local->ops->change_interface) 1736 return -EBUSY; 1737 1738 switch (sdata->vif.type) { 1739 case NL80211_IFTYPE_AP: 1740 if (!list_empty(&sdata->u.ap.vlans)) 1741 return -EBUSY; 1742 break; 1743 case NL80211_IFTYPE_STATION: 1744 case NL80211_IFTYPE_ADHOC: 1745 case NL80211_IFTYPE_OCB: 1746 /* 1747 * Could maybe also all others here? 1748 * Just not sure how that interacts 1749 * with the RX/config path e.g. for 1750 * mesh. 1751 */ 1752 break; 1753 default: 1754 return -EBUSY; 1755 } 1756 1757 switch (type) { 1758 case NL80211_IFTYPE_AP: 1759 case NL80211_IFTYPE_STATION: 1760 case NL80211_IFTYPE_ADHOC: 1761 case NL80211_IFTYPE_OCB: 1762 /* 1763 * Could probably support everything 1764 * but here. 1765 */ 1766 break; 1767 case NL80211_IFTYPE_P2P_CLIENT: 1768 p2p = true; 1769 internal_type = NL80211_IFTYPE_STATION; 1770 break; 1771 case NL80211_IFTYPE_P2P_GO: 1772 p2p = true; 1773 internal_type = NL80211_IFTYPE_AP; 1774 break; 1775 default: 1776 return -EBUSY; 1777 } 1778 1779 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1780 if (ret) 1781 return ret; 1782 1783 ieee80211_stop_vif_queues(local, sdata, 1784 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1785 synchronize_net(); 1786 1787 ieee80211_do_stop(sdata, false); 1788 1789 ieee80211_teardown_sdata(sdata); 1790 1791 ieee80211_set_sdata_offload_flags(sdata); 1792 ret = drv_change_interface(local, sdata, internal_type, p2p); 1793 if (ret) 1794 type = ieee80211_vif_type_p2p(&sdata->vif); 1795 1796 /* 1797 * Ignore return value here, there's not much we can do since 1798 * the driver changed the interface type internally already. 1799 * The warnings will hopefully make driver authors fix it :-) 1800 */ 1801 ieee80211_check_queues(sdata, type); 1802 1803 ieee80211_setup_sdata(sdata, type); 1804 ieee80211_set_vif_encap_ops(sdata); 1805 1806 err = ieee80211_do_open(&sdata->wdev, false); 1807 WARN(err, "type change: do_open returned %d", err); 1808 1809 ieee80211_wake_vif_queues(local, sdata, 1810 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1811 return ret; 1812 } 1813 1814 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1815 enum nl80211_iftype type) 1816 { 1817 int ret; 1818 1819 ASSERT_RTNL(); 1820 1821 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1822 return 0; 1823 1824 if (ieee80211_sdata_running(sdata)) { 1825 ret = ieee80211_runtime_change_iftype(sdata, type); 1826 if (ret) 1827 return ret; 1828 } else { 1829 /* Purge and reset type-dependent state. */ 1830 ieee80211_teardown_sdata(sdata); 1831 ieee80211_setup_sdata(sdata, type); 1832 } 1833 1834 /* reset some values that shouldn't be kept across type changes */ 1835 if (type == NL80211_IFTYPE_STATION) 1836 sdata->u.mgd.use_4addr = false; 1837 1838 return 0; 1839 } 1840 1841 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1842 u8 *perm_addr, enum nl80211_iftype type) 1843 { 1844 struct ieee80211_sub_if_data *sdata; 1845 u64 mask, start, addr, val, inc; 1846 u8 *m; 1847 u8 tmp_addr[ETH_ALEN]; 1848 int i; 1849 1850 /* default ... something at least */ 1851 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1852 1853 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1854 local->hw.wiphy->n_addresses <= 1) 1855 return; 1856 1857 mutex_lock(&local->iflist_mtx); 1858 1859 switch (type) { 1860 case NL80211_IFTYPE_MONITOR: 1861 /* doesn't matter */ 1862 break; 1863 case NL80211_IFTYPE_AP_VLAN: 1864 /* match up with an AP interface */ 1865 list_for_each_entry(sdata, &local->interfaces, list) { 1866 if (sdata->vif.type != NL80211_IFTYPE_AP) 1867 continue; 1868 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1869 break; 1870 } 1871 /* keep default if no AP interface present */ 1872 break; 1873 case NL80211_IFTYPE_P2P_CLIENT: 1874 case NL80211_IFTYPE_P2P_GO: 1875 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1876 list_for_each_entry(sdata, &local->interfaces, list) { 1877 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1878 continue; 1879 if (!ieee80211_sdata_running(sdata)) 1880 continue; 1881 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1882 goto out_unlock; 1883 } 1884 } 1885 fallthrough; 1886 default: 1887 /* assign a new address if possible -- try n_addresses first */ 1888 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1889 bool used = false; 1890 1891 list_for_each_entry(sdata, &local->interfaces, list) { 1892 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1893 sdata->vif.addr)) { 1894 used = true; 1895 break; 1896 } 1897 } 1898 1899 if (!used) { 1900 memcpy(perm_addr, 1901 local->hw.wiphy->addresses[i].addr, 1902 ETH_ALEN); 1903 break; 1904 } 1905 } 1906 1907 /* try mask if available */ 1908 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1909 break; 1910 1911 m = local->hw.wiphy->addr_mask; 1912 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1913 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1914 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1915 1916 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1917 /* not a contiguous mask ... not handled now! */ 1918 pr_info("not contiguous\n"); 1919 break; 1920 } 1921 1922 /* 1923 * Pick address of existing interface in case user changed 1924 * MAC address manually, default to perm_addr. 1925 */ 1926 m = local->hw.wiphy->perm_addr; 1927 list_for_each_entry(sdata, &local->interfaces, list) { 1928 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1929 continue; 1930 m = sdata->vif.addr; 1931 break; 1932 } 1933 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1934 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1935 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1936 1937 inc = 1ULL<<__ffs64(mask); 1938 val = (start & mask); 1939 addr = (start & ~mask) | (val & mask); 1940 do { 1941 bool used = false; 1942 1943 tmp_addr[5] = addr >> 0*8; 1944 tmp_addr[4] = addr >> 1*8; 1945 tmp_addr[3] = addr >> 2*8; 1946 tmp_addr[2] = addr >> 3*8; 1947 tmp_addr[1] = addr >> 4*8; 1948 tmp_addr[0] = addr >> 5*8; 1949 1950 val += inc; 1951 1952 list_for_each_entry(sdata, &local->interfaces, list) { 1953 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1954 used = true; 1955 break; 1956 } 1957 } 1958 1959 if (!used) { 1960 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1961 break; 1962 } 1963 addr = (start & ~mask) | (val & mask); 1964 } while (addr != start); 1965 1966 break; 1967 } 1968 1969 out_unlock: 1970 mutex_unlock(&local->iflist_mtx); 1971 } 1972 1973 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1974 unsigned char name_assign_type, 1975 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1976 struct vif_params *params) 1977 { 1978 struct net_device *ndev = NULL; 1979 struct ieee80211_sub_if_data *sdata = NULL; 1980 struct txq_info *txqi; 1981 void (*if_setup)(struct net_device *dev); 1982 int ret, i; 1983 int txqs = 1; 1984 1985 ASSERT_RTNL(); 1986 1987 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 1988 struct wireless_dev *wdev; 1989 1990 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1991 GFP_KERNEL); 1992 if (!sdata) 1993 return -ENOMEM; 1994 wdev = &sdata->wdev; 1995 1996 sdata->dev = NULL; 1997 strlcpy(sdata->name, name, IFNAMSIZ); 1998 ieee80211_assign_perm_addr(local, wdev->address, type); 1999 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2000 } else { 2001 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2002 sizeof(void *)); 2003 int txq_size = 0; 2004 2005 if (local->ops->wake_tx_queue && 2006 type != NL80211_IFTYPE_AP_VLAN && 2007 (type != NL80211_IFTYPE_MONITOR || 2008 (params->flags & MONITOR_FLAG_ACTIVE))) 2009 txq_size += sizeof(struct txq_info) + 2010 local->hw.txq_data_size; 2011 2012 if (local->ops->wake_tx_queue) { 2013 if_setup = ieee80211_if_setup_no_queue; 2014 } else { 2015 if_setup = ieee80211_if_setup; 2016 if (local->hw.queues >= IEEE80211_NUM_ACS) 2017 txqs = IEEE80211_NUM_ACS; 2018 } 2019 2020 ndev = alloc_netdev_mqs(size + txq_size, 2021 name, name_assign_type, 2022 if_setup, txqs, 1); 2023 if (!ndev) 2024 return -ENOMEM; 2025 2026 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len) 2027 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len; 2028 2029 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2030 2031 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2032 if (!ndev->tstats) { 2033 free_netdev(ndev); 2034 return -ENOMEM; 2035 } 2036 2037 ndev->needed_headroom = local->tx_headroom + 2038 4*6 /* four MAC addresses */ 2039 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2040 + 6 /* mesh */ 2041 + 8 /* rfc1042/bridge tunnel */ 2042 - ETH_HLEN /* ethernet hard_header_len */ 2043 + IEEE80211_ENCRYPT_HEADROOM; 2044 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2045 2046 ret = dev_alloc_name(ndev, ndev->name); 2047 if (ret < 0) { 2048 ieee80211_if_free(ndev); 2049 free_netdev(ndev); 2050 return ret; 2051 } 2052 2053 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2054 if (is_valid_ether_addr(params->macaddr)) 2055 eth_hw_addr_set(ndev, params->macaddr); 2056 else 2057 eth_hw_addr_set(ndev, ndev->perm_addr); 2058 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2059 2060 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2061 sdata = netdev_priv(ndev); 2062 ndev->ieee80211_ptr = &sdata->wdev; 2063 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2064 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2065 2066 if (txq_size) { 2067 txqi = netdev_priv(ndev) + size; 2068 ieee80211_txq_init(sdata, NULL, txqi, 0); 2069 } 2070 2071 sdata->dev = ndev; 2072 } 2073 2074 /* initialise type-independent data */ 2075 sdata->wdev.wiphy = local->hw.wiphy; 2076 sdata->local = local; 2077 2078 ieee80211_init_frag_cache(&sdata->frags); 2079 2080 INIT_LIST_HEAD(&sdata->key_list); 2081 2082 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 2083 ieee80211_dfs_cac_timer_work); 2084 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 2085 ieee80211_delayed_tailroom_dec); 2086 2087 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2088 struct ieee80211_supported_band *sband; 2089 sband = local->hw.wiphy->bands[i]; 2090 sdata->rc_rateidx_mask[i] = 2091 sband ? (1 << sband->n_bitrates) - 1 : 0; 2092 if (sband) { 2093 __le16 cap; 2094 u16 *vht_rate_mask; 2095 2096 memcpy(sdata->rc_rateidx_mcs_mask[i], 2097 sband->ht_cap.mcs.rx_mask, 2098 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2099 2100 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2101 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2102 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2103 } else { 2104 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2105 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2106 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2107 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2108 } 2109 } 2110 2111 for (i = 0; i < IEEE80211_NUM_ACS; i++) 2112 init_airtime_info(&sdata->airtime[i], &local->airtime[i]); 2113 2114 ieee80211_set_default_queues(sdata); 2115 2116 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2117 sdata->user_power_level = local->user_power_level; 2118 2119 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2120 2121 /* setup type-dependent data */ 2122 ieee80211_setup_sdata(sdata, type); 2123 2124 if (ndev) { 2125 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2126 if (type == NL80211_IFTYPE_STATION) 2127 sdata->u.mgd.use_4addr = params->use_4addr; 2128 2129 ndev->features |= local->hw.netdev_features; 2130 ndev->hw_features |= ndev->features & 2131 MAC80211_SUPPORTED_FEATURES_TX; 2132 2133 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2134 2135 /* MTU range is normally 256 - 2304, where the upper limit is 2136 * the maximum MSDU size. Monitor interfaces send and receive 2137 * MPDU and A-MSDU frames which may be much larger so we do 2138 * not impose an upper limit in that case. 2139 */ 2140 ndev->min_mtu = 256; 2141 if (type == NL80211_IFTYPE_MONITOR) 2142 ndev->max_mtu = 0; 2143 else 2144 ndev->max_mtu = local->hw.max_mtu; 2145 2146 ret = cfg80211_register_netdevice(ndev); 2147 if (ret) { 2148 free_netdev(ndev); 2149 return ret; 2150 } 2151 } 2152 2153 mutex_lock(&local->iflist_mtx); 2154 list_add_tail_rcu(&sdata->list, &local->interfaces); 2155 mutex_unlock(&local->iflist_mtx); 2156 2157 if (new_wdev) 2158 *new_wdev = &sdata->wdev; 2159 2160 return 0; 2161 } 2162 2163 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2164 { 2165 ASSERT_RTNL(); 2166 2167 mutex_lock(&sdata->local->iflist_mtx); 2168 list_del_rcu(&sdata->list); 2169 mutex_unlock(&sdata->local->iflist_mtx); 2170 2171 if (sdata->vif.txq) 2172 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2173 2174 synchronize_rcu(); 2175 2176 cfg80211_unregister_wdev(&sdata->wdev); 2177 2178 if (!sdata->dev) { 2179 ieee80211_teardown_sdata(sdata); 2180 kfree(sdata); 2181 } 2182 } 2183 2184 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2185 { 2186 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2187 return; 2188 ieee80211_do_stop(sdata, true); 2189 } 2190 2191 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2192 { 2193 struct ieee80211_sub_if_data *sdata, *tmp; 2194 LIST_HEAD(unreg_list); 2195 LIST_HEAD(wdev_list); 2196 2197 ASSERT_RTNL(); 2198 2199 /* Before destroying the interfaces, make sure they're all stopped so 2200 * that the hardware is stopped. Otherwise, the driver might still be 2201 * iterating the interfaces during the shutdown, e.g. from a worker 2202 * or from RX processing or similar, and if it does so (using atomic 2203 * iteration) while we're manipulating the list, the iteration will 2204 * crash. 2205 * 2206 * After this, the hardware should be stopped and the driver should 2207 * have stopped all of its activities, so that we can do RCU-unaware 2208 * manipulations of the interface list below. 2209 */ 2210 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2211 2212 WARN(local->open_count, "%s: open count remains %d\n", 2213 wiphy_name(local->hw.wiphy), local->open_count); 2214 2215 ieee80211_txq_teardown_flows(local); 2216 2217 mutex_lock(&local->iflist_mtx); 2218 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 2219 list_del(&sdata->list); 2220 2221 if (sdata->dev) 2222 unregister_netdevice_queue(sdata->dev, &unreg_list); 2223 else 2224 list_add(&sdata->list, &wdev_list); 2225 } 2226 mutex_unlock(&local->iflist_mtx); 2227 2228 unregister_netdevice_many(&unreg_list); 2229 2230 wiphy_lock(local->hw.wiphy); 2231 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 2232 list_del(&sdata->list); 2233 cfg80211_unregister_wdev(&sdata->wdev); 2234 kfree(sdata); 2235 } 2236 wiphy_unlock(local->hw.wiphy); 2237 } 2238 2239 static int netdev_notify(struct notifier_block *nb, 2240 unsigned long state, void *ptr) 2241 { 2242 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2243 struct ieee80211_sub_if_data *sdata; 2244 2245 if (state != NETDEV_CHANGENAME) 2246 return NOTIFY_DONE; 2247 2248 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2249 return NOTIFY_DONE; 2250 2251 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2252 return NOTIFY_DONE; 2253 2254 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2255 memcpy(sdata->name, dev->name, IFNAMSIZ); 2256 ieee80211_debugfs_rename_netdev(sdata); 2257 2258 return NOTIFY_OK; 2259 } 2260 2261 static struct notifier_block mac80211_netdev_notifier = { 2262 .notifier_call = netdev_notify, 2263 }; 2264 2265 int ieee80211_iface_init(void) 2266 { 2267 return register_netdevice_notifier(&mac80211_netdev_notifier); 2268 } 2269 2270 void ieee80211_iface_exit(void) 2271 { 2272 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2273 } 2274 2275 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2276 { 2277 if (sdata->vif.type == NL80211_IFTYPE_AP) 2278 atomic_inc(&sdata->u.ap.num_mcast_sta); 2279 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2280 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2281 } 2282 2283 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2284 { 2285 if (sdata->vif.type == NL80211_IFTYPE_AP) 2286 atomic_dec(&sdata->u.ap.num_mcast_sta); 2287 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2288 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2289 } 2290