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) 2018-2025 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 *and* wiphy mutex 37 * *and* iflist_mtx 38 * (2) 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 wiphy mutex, the iflist_mtx or RCU. 43 */ 44 45 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work); 46 47 bool __ieee80211_recalc_txpower(struct ieee80211_link_data *link) 48 { 49 struct ieee80211_chanctx_conf *chanctx_conf; 50 int power; 51 52 rcu_read_lock(); 53 chanctx_conf = rcu_dereference(link->conf->chanctx_conf); 54 if (!chanctx_conf) { 55 rcu_read_unlock(); 56 return false; 57 } 58 59 power = ieee80211_chandef_max_power(&chanctx_conf->def); 60 rcu_read_unlock(); 61 62 if (link->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 63 power = min(power, link->user_power_level); 64 65 if (link->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 66 power = min(power, link->ap_power_level); 67 68 if (power != link->conf->txpower) { 69 link->conf->txpower = power; 70 return true; 71 } 72 73 return false; 74 } 75 76 void ieee80211_recalc_txpower(struct ieee80211_link_data *link, 77 bool update_bss) 78 { 79 if (__ieee80211_recalc_txpower(link) || 80 (update_bss && ieee80211_sdata_running(link->sdata))) 81 ieee80211_link_info_change_notify(link->sdata, link, 82 BSS_CHANGED_TXPOWER); 83 } 84 85 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 86 { 87 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 88 return 0; 89 90 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 91 return IEEE80211_CONF_CHANGE_IDLE; 92 } 93 94 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 95 { 96 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 97 return 0; 98 99 ieee80211_flush_queues(local, NULL, false); 100 101 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 102 return IEEE80211_CONF_CHANGE_IDLE; 103 } 104 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 106 bool force_active) 107 { 108 bool working, scanning, active; 109 unsigned int led_trig_start = 0, led_trig_stop = 0; 110 struct ieee80211_sub_if_data *iter; 111 112 lockdep_assert_wiphy(local->hw.wiphy); 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 list_for_each_entry(iter, &local->interfaces, list) { 122 if (iter->vif.type == NL80211_IFTYPE_NAN && 123 iter->u.nan.started) { 124 working = true; 125 break; 126 } 127 } 128 129 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 130 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 131 132 if (working || scanning) 133 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 134 else 135 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 136 137 if (active) 138 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 139 else 140 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 141 142 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 143 144 if (working || scanning || active) 145 return __ieee80211_idle_off(local); 146 return __ieee80211_idle_on(local); 147 } 148 149 u32 ieee80211_idle_off(struct ieee80211_local *local) 150 { 151 return __ieee80211_recalc_idle(local, true); 152 } 153 154 void ieee80211_recalc_idle(struct ieee80211_local *local) 155 { 156 u32 change = __ieee80211_recalc_idle(local, false); 157 if (change) 158 ieee80211_hw_config(local, -1, change); 159 } 160 161 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 162 bool check_dup) 163 { 164 struct ieee80211_local *local = sdata->local; 165 struct ieee80211_sub_if_data *iter; 166 u64 new, mask, tmp; 167 u8 *m; 168 int ret = 0; 169 170 lockdep_assert_wiphy(local->hw.wiphy); 171 172 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 173 return 0; 174 175 m = addr; 176 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 177 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 178 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 179 180 m = local->hw.wiphy->addr_mask; 181 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 182 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 183 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 184 185 if (!check_dup) 186 return ret; 187 188 list_for_each_entry(iter, &local->interfaces, list) { 189 if (iter == sdata) 190 continue; 191 192 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 193 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 194 continue; 195 196 m = iter->vif.addr; 197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 200 201 if ((new & ~mask) != (tmp & ~mask)) { 202 ret = -EINVAL; 203 break; 204 } 205 } 206 207 return ret; 208 } 209 210 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 211 { 212 struct ieee80211_roc_work *roc; 213 struct ieee80211_local *local = sdata->local; 214 struct ieee80211_sub_if_data *scan_sdata; 215 int ret = 0; 216 217 lockdep_assert_wiphy(local->hw.wiphy); 218 219 /* To be the most flexible here we want to only limit changing the 220 * address if the specific interface is doing offchannel work or 221 * scanning. 222 */ 223 if (netif_carrier_ok(sdata->dev)) 224 return -EBUSY; 225 226 /* First check no ROC work is happening on this iface */ 227 list_for_each_entry(roc, &local->roc_list, list) { 228 if (roc->sdata != sdata) 229 continue; 230 231 if (roc->started) { 232 ret = -EBUSY; 233 goto unlock; 234 } 235 } 236 237 /* And if this iface is scanning */ 238 if (local->scanning) { 239 scan_sdata = rcu_dereference_protected(local->scan_sdata, 240 lockdep_is_held(&local->hw.wiphy->mtx)); 241 if (sdata == scan_sdata) 242 ret = -EBUSY; 243 } 244 245 switch (sdata->vif.type) { 246 case NL80211_IFTYPE_STATION: 247 case NL80211_IFTYPE_P2P_CLIENT: 248 /* More interface types could be added here but changing the 249 * address while powered makes the most sense in client modes. 250 */ 251 break; 252 default: 253 ret = -EOPNOTSUPP; 254 } 255 256 unlock: 257 return ret; 258 } 259 260 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata, 261 void *addr) 262 { 263 struct ieee80211_local *local = sdata->local; 264 struct sockaddr *sa = addr; 265 bool check_dup = true; 266 bool live = false; 267 int ret; 268 269 if (ieee80211_sdata_running(sdata)) { 270 ret = ieee80211_can_powered_addr_change(sdata); 271 if (ret) 272 return ret; 273 274 live = true; 275 } 276 277 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 278 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 279 check_dup = false; 280 281 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 282 if (ret) 283 return ret; 284 285 if (live) 286 drv_remove_interface(local, sdata); 287 ret = eth_mac_addr(sdata->dev, sa); 288 289 if (ret == 0) { 290 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 291 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 292 } 293 294 /* Regardless of eth_mac_addr() return we still want to add the 295 * interface back. This should not fail... 296 */ 297 if (live) 298 WARN_ON(drv_add_interface(local, sdata)); 299 300 return ret; 301 } 302 303 static int ieee80211_change_mac(struct net_device *dev, void *addr) 304 { 305 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 306 struct ieee80211_local *local = sdata->local; 307 308 /* 309 * This happens during unregistration if there's a bond device 310 * active (maybe other cases?) and we must get removed from it. 311 * But we really don't care anymore if it's not registered now. 312 */ 313 if (!dev->ieee80211_ptr->registered) 314 return 0; 315 316 guard(wiphy)(local->hw.wiphy); 317 318 return _ieee80211_change_mac(sdata, addr); 319 } 320 321 static inline int identical_mac_addr_allowed(int type1, int type2) 322 { 323 return type1 == NL80211_IFTYPE_MONITOR || 324 type2 == NL80211_IFTYPE_MONITOR || 325 type1 == NL80211_IFTYPE_P2P_DEVICE || 326 type2 == NL80211_IFTYPE_P2P_DEVICE || 327 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 328 (type1 == NL80211_IFTYPE_AP_VLAN && 329 (type2 == NL80211_IFTYPE_AP || 330 type2 == NL80211_IFTYPE_AP_VLAN)); 331 } 332 333 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 334 enum nl80211_iftype iftype) 335 { 336 struct ieee80211_local *local = sdata->local; 337 struct ieee80211_sub_if_data *nsdata; 338 339 ASSERT_RTNL(); 340 lockdep_assert_wiphy(local->hw.wiphy); 341 342 /* we hold the RTNL here so can safely walk the list */ 343 list_for_each_entry(nsdata, &local->interfaces, list) { 344 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 345 /* 346 * Only OCB and monitor mode may coexist 347 */ 348 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 349 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 350 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 351 nsdata->vif.type == NL80211_IFTYPE_OCB)) 352 return -EBUSY; 353 354 /* 355 * Allow only a single IBSS interface to be up at any 356 * time. This is restricted because beacon distribution 357 * cannot work properly if both are in the same IBSS. 358 * 359 * To remove this restriction we'd have to disallow them 360 * from setting the same SSID on different IBSS interfaces 361 * belonging to the same hardware. Then, however, we're 362 * faced with having to adopt two different TSF timers... 363 */ 364 if (iftype == NL80211_IFTYPE_ADHOC && 365 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 366 return -EBUSY; 367 /* 368 * will not add another interface while any channel 369 * switch is active. 370 */ 371 if (nsdata->vif.bss_conf.csa_active) 372 return -EBUSY; 373 374 /* 375 * The remaining checks are only performed for interfaces 376 * with the same MAC address. 377 */ 378 if (!ether_addr_equal(sdata->vif.addr, 379 nsdata->vif.addr)) 380 continue; 381 382 /* 383 * check whether it may have the same address 384 */ 385 if (!identical_mac_addr_allowed(iftype, 386 nsdata->vif.type)) 387 return -ENOTUNIQ; 388 389 /* No support for VLAN with MLO yet */ 390 if (iftype == NL80211_IFTYPE_AP_VLAN && 391 sdata->wdev.use_4addr && 392 nsdata->vif.type == NL80211_IFTYPE_AP && 393 nsdata->vif.valid_links) 394 return -EOPNOTSUPP; 395 396 /* 397 * can only add VLANs to enabled APs 398 */ 399 if (iftype == NL80211_IFTYPE_AP_VLAN && 400 nsdata->vif.type == NL80211_IFTYPE_AP) 401 sdata->bss = &nsdata->u.ap; 402 } 403 } 404 405 return ieee80211_check_combinations(sdata, NULL, 0, 0, -1); 406 } 407 408 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 409 enum nl80211_iftype iftype) 410 { 411 int n_queues = sdata->local->hw.queues; 412 int i; 413 414 if (iftype == NL80211_IFTYPE_NAN) 415 return 0; 416 417 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 418 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 419 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 420 IEEE80211_INVAL_HW_QUEUE)) 421 return -EINVAL; 422 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 423 n_queues)) 424 return -EINVAL; 425 } 426 } 427 428 if ((iftype != NL80211_IFTYPE_AP && 429 iftype != NL80211_IFTYPE_P2P_GO && 430 iftype != NL80211_IFTYPE_MESH_POINT) || 431 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 432 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 433 return 0; 434 } 435 436 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 437 return -EINVAL; 438 439 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 440 return -EINVAL; 441 442 return 0; 443 } 444 445 static int ieee80211_open(struct net_device *dev) 446 { 447 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 448 int err; 449 450 /* fail early if user set an invalid address */ 451 if (!is_valid_ether_addr(dev->dev_addr)) 452 return -EADDRNOTAVAIL; 453 454 guard(wiphy)(sdata->local->hw.wiphy); 455 456 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 457 if (err) 458 return err; 459 460 return ieee80211_do_open(&sdata->wdev, true); 461 } 462 463 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 464 { 465 struct ieee80211_local *local = sdata->local; 466 unsigned long flags; 467 struct sk_buff_head freeq; 468 struct sk_buff *skb, *tmp; 469 u32 hw_reconf_flags = 0; 470 int i, flushed; 471 struct ps_data *ps; 472 struct cfg80211_chan_def chandef; 473 bool cancel_scan; 474 struct cfg80211_nan_func *func; 475 476 lockdep_assert_wiphy(local->hw.wiphy); 477 478 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 479 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 480 481 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 482 if (cancel_scan) 483 ieee80211_scan_cancel(local); 484 485 ieee80211_roc_purge(local, sdata); 486 487 switch (sdata->vif.type) { 488 case NL80211_IFTYPE_STATION: 489 ieee80211_mgd_stop(sdata); 490 break; 491 case NL80211_IFTYPE_ADHOC: 492 ieee80211_ibss_stop(sdata); 493 break; 494 case NL80211_IFTYPE_MONITOR: 495 list_del_rcu(&sdata->u.mntr.list); 496 break; 497 case NL80211_IFTYPE_AP_VLAN: 498 ieee80211_apvlan_link_clear(sdata); 499 break; 500 default: 501 break; 502 } 503 504 /* 505 * Remove all stations associated with this interface. 506 * 507 * This must be done before calling ops->remove_interface() 508 * because otherwise we can later invoke ops->sta_notify() 509 * whenever the STAs are removed, and that invalidates driver 510 * assumptions about always getting a vif pointer that is valid 511 * (because if we remove a STA after ops->remove_interface() 512 * the driver will have removed the vif info already!) 513 * 514 * For AP_VLANs stations may exist since there's nothing else that 515 * would have removed them, but in other modes there shouldn't 516 * be any stations. 517 */ 518 flushed = sta_info_flush(sdata, -1); 519 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 520 521 /* don't count this interface for allmulti while it is down */ 522 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 523 atomic_dec(&local->iff_allmultis); 524 525 if (sdata->vif.type == NL80211_IFTYPE_AP) { 526 local->fif_pspoll--; 527 local->fif_probe_req--; 528 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 529 local->fif_probe_req--; 530 } 531 532 if (sdata->dev) { 533 netif_addr_lock_bh(sdata->dev); 534 spin_lock_bh(&local->filter_lock); 535 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 536 sdata->dev->addr_len); 537 spin_unlock_bh(&local->filter_lock); 538 netif_addr_unlock_bh(sdata->dev); 539 } 540 541 timer_delete_sync(&local->dynamic_ps_timer); 542 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 543 544 WARN(ieee80211_vif_is_mld(&sdata->vif), 545 "destroying interface with valid links 0x%04x\n", 546 sdata->vif.valid_links); 547 548 sdata->vif.bss_conf.csa_active = false; 549 if (sdata->vif.type == NL80211_IFTYPE_STATION) 550 sdata->deflink.u.mgd.csa.waiting_bcn = false; 551 ieee80211_vif_unblock_queues_csa(sdata); 552 553 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); 554 wiphy_work_cancel(local->hw.wiphy, 555 &sdata->deflink.color_change_finalize_work); 556 wiphy_delayed_work_cancel(local->hw.wiphy, 557 &sdata->deflink.dfs_cac_timer_work); 558 559 if (sdata->wdev.links[0].cac_started) { 560 chandef = sdata->vif.bss_conf.chanreq.oper; 561 WARN_ON(local->suspended); 562 ieee80211_link_release_channel(&sdata->deflink); 563 cfg80211_cac_event(sdata->dev, &chandef, 564 NL80211_RADAR_CAC_ABORTED, 565 GFP_KERNEL, 0); 566 } 567 568 if (sdata->vif.type == NL80211_IFTYPE_AP) { 569 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 570 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 571 /* remove all packets in parent bc_buf pointing to this dev */ 572 ps = &sdata->bss->ps; 573 574 spin_lock_irqsave(&ps->bc_buf.lock, flags); 575 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 576 if (skb->dev == sdata->dev) { 577 __skb_unlink(skb, &ps->bc_buf); 578 local->total_ps_buffered--; 579 ieee80211_free_txskb(&local->hw, skb); 580 } 581 } 582 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 583 } 584 585 if (going_down) 586 local->open_count--; 587 588 switch (sdata->vif.type) { 589 case NL80211_IFTYPE_AP_VLAN: 590 list_del(&sdata->u.vlan.list); 591 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 592 /* see comment in the default case below */ 593 ieee80211_free_keys(sdata, true); 594 /* no need to tell driver */ 595 break; 596 case NL80211_IFTYPE_MONITOR: 597 local->monitors--; 598 599 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 600 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 601 602 local->virt_monitors--; 603 if (local->virt_monitors == 0) { 604 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 605 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 606 } 607 608 ieee80211_adjust_monitor_flags(sdata, -1); 609 } 610 break; 611 case NL80211_IFTYPE_NAN: 612 /* clean all the functions */ 613 spin_lock_bh(&sdata->u.nan.func_lock); 614 615 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 616 idr_remove(&sdata->u.nan.function_inst_ids, i); 617 cfg80211_free_nan_func(func); 618 } 619 idr_destroy(&sdata->u.nan.function_inst_ids); 620 621 spin_unlock_bh(&sdata->u.nan.func_lock); 622 break; 623 default: 624 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 625 /* 626 * When we get here, the interface is marked down. 627 * Free the remaining keys, if there are any 628 * (which can happen in AP mode if userspace sets 629 * keys before the interface is operating) 630 * 631 * Force the key freeing to always synchronize_net() 632 * to wait for the RX path in case it is using this 633 * interface enqueuing frames at this very time on 634 * another CPU. 635 */ 636 ieee80211_free_keys(sdata, true); 637 skb_queue_purge(&sdata->skb_queue); 638 skb_queue_purge(&sdata->status_queue); 639 } 640 641 /* 642 * Since ieee80211_free_txskb() may issue __dev_queue_xmit() 643 * which should be called with interrupts enabled, reclamation 644 * is done in two phases: 645 */ 646 __skb_queue_head_init(&freeq); 647 648 /* unlink from local queues... */ 649 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 650 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 651 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 652 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 653 if (info->control.vif == &sdata->vif) { 654 __skb_unlink(skb, &local->pending[i]); 655 __skb_queue_tail(&freeq, skb); 656 } 657 } 658 } 659 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 660 661 /* ... and perform actual reclamation with interrupts enabled. */ 662 skb_queue_walk_safe(&freeq, skb, tmp) { 663 __skb_unlink(skb, &freeq); 664 ieee80211_free_txskb(&local->hw, skb); 665 } 666 667 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 668 ieee80211_txq_remove_vlan(local, sdata); 669 670 if (sdata->vif.txq) 671 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 672 673 sdata->bss = NULL; 674 675 if (local->open_count == 0) 676 ieee80211_clear_tx_pending(local); 677 678 sdata->vif.bss_conf.beacon_int = 0; 679 680 /* 681 * If the interface goes down while suspended, presumably because 682 * the device was unplugged and that happens before our resume, 683 * then the driver is already unconfigured and the remainder of 684 * this function isn't needed. 685 * XXX: what about WoWLAN? If the device has software state, e.g. 686 * memory allocated, it might expect teardown commands from 687 * mac80211 here? 688 */ 689 if (local->suspended) { 690 WARN_ON(local->wowlan); 691 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 692 return; 693 } 694 695 switch (sdata->vif.type) { 696 case NL80211_IFTYPE_AP_VLAN: 697 break; 698 case NL80211_IFTYPE_MONITOR: 699 if (local->virt_monitors == 0) 700 ieee80211_del_virtual_monitor(local); 701 702 ieee80211_recalc_idle(local); 703 ieee80211_recalc_offload(local); 704 705 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 706 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 707 break; 708 709 ieee80211_link_release_channel(&sdata->deflink); 710 fallthrough; 711 default: 712 if (!going_down) 713 break; 714 drv_remove_interface(local, sdata); 715 716 /* Clear private driver data to prevent reuse */ 717 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); 718 } 719 720 ieee80211_recalc_ps(local); 721 722 if (cancel_scan) 723 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 724 725 if (local->open_count == 0) { 726 ieee80211_stop_device(local, false); 727 728 /* no reconfiguring after stop! */ 729 return; 730 } 731 732 /* do after stop to avoid reconfiguring when we stop anyway */ 733 ieee80211_configure_filter(local); 734 ieee80211_hw_config(local, -1, hw_reconf_flags); 735 736 if (local->virt_monitors == local->open_count) 737 ieee80211_add_virtual_monitor(local); 738 } 739 740 void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 741 { 742 struct ieee80211_sub_if_data *tx_sdata; 743 struct ieee80211_bss_conf *link_conf, *tx_bss_conf; 744 struct ieee80211_link_data *tx_link, *link; 745 unsigned int link_id; 746 747 lockdep_assert_wiphy(sdata->local->hw.wiphy); 748 749 /* Check if any of the links of current sdata is an MBSSID. */ 750 for_each_vif_active_link(&sdata->vif, link_conf, link_id) { 751 tx_bss_conf = sdata_dereference(link_conf->tx_bss_conf, sdata); 752 if (!tx_bss_conf) 753 continue; 754 755 tx_sdata = vif_to_sdata(tx_bss_conf->vif); 756 RCU_INIT_POINTER(link_conf->tx_bss_conf, NULL); 757 758 /* If we are not tx sdata reset tx sdata's tx_bss_conf to avoid recusrion 759 * while closing tx sdata at the end of outer loop below. 760 */ 761 if (sdata != tx_sdata) { 762 tx_link = sdata_dereference(tx_sdata->link[tx_bss_conf->link_id], 763 tx_sdata); 764 if (!tx_link) 765 continue; 766 767 RCU_INIT_POINTER(tx_link->conf->tx_bss_conf, NULL); 768 } 769 770 /* loop through sdatas to find if any of their links 771 * belong to same MBSSID set as the one getting deleted. 772 */ 773 for_each_sdata_link(tx_sdata->local, link) { 774 struct ieee80211_sub_if_data *link_sdata = link->sdata; 775 776 if (link_sdata == sdata || link_sdata == tx_sdata || 777 rcu_access_pointer(link->conf->tx_bss_conf) != tx_bss_conf) 778 continue; 779 780 RCU_INIT_POINTER(link->conf->tx_bss_conf, NULL); 781 782 /* Remove all links of matching MLD until dynamic link 783 * removal can be supported. 784 */ 785 cfg80211_stop_iface(link_sdata->wdev.wiphy, &link_sdata->wdev, 786 GFP_KERNEL); 787 } 788 789 /* If we are not tx sdata, remove links of tx sdata and proceed */ 790 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) 791 cfg80211_stop_iface(tx_sdata->wdev.wiphy, 792 &tx_sdata->wdev, GFP_KERNEL); 793 } 794 } 795 796 static int ieee80211_stop(struct net_device *dev) 797 { 798 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 799 800 /* close dependent VLAN interfaces before locking wiphy */ 801 if (sdata->vif.type == NL80211_IFTYPE_AP) { 802 struct ieee80211_sub_if_data *vlan, *tmpsdata; 803 804 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 805 u.vlan.list) 806 dev_close(vlan->dev); 807 } 808 809 guard(wiphy)(sdata->local->hw.wiphy); 810 811 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 812 813 /* Close the dependent MBSSID interfaces with wiphy lock as we may be 814 * terminating its partner links too in case of MLD. 815 */ 816 if (sdata->vif.type == NL80211_IFTYPE_AP) 817 ieee80211_stop_mbssid(sdata); 818 819 ieee80211_do_stop(sdata, true); 820 821 return 0; 822 } 823 824 static void ieee80211_set_multicast_list(struct net_device *dev) 825 { 826 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 827 struct ieee80211_local *local = sdata->local; 828 int allmulti, sdata_allmulti; 829 830 allmulti = !!(dev->flags & IFF_ALLMULTI); 831 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 832 833 if (allmulti != sdata_allmulti) { 834 if (dev->flags & IFF_ALLMULTI) 835 atomic_inc(&local->iff_allmultis); 836 else 837 atomic_dec(&local->iff_allmultis); 838 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 839 } 840 841 spin_lock_bh(&local->filter_lock); 842 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 843 spin_unlock_bh(&local->filter_lock); 844 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 845 } 846 847 /* 848 * Called when the netdev is removed or, by the code below, before 849 * the interface type changes. 850 */ 851 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 852 { 853 if (WARN_ON(!list_empty(&sdata->work.entry))) 854 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 855 856 /* free extra data */ 857 ieee80211_free_keys(sdata, false); 858 859 ieee80211_debugfs_remove_netdev(sdata); 860 861 ieee80211_destroy_frag_cache(&sdata->frags); 862 863 if (ieee80211_vif_is_mesh(&sdata->vif)) 864 ieee80211_mesh_teardown_sdata(sdata); 865 866 ieee80211_vif_clear_links(sdata); 867 ieee80211_link_stop(&sdata->deflink); 868 } 869 870 static void ieee80211_uninit(struct net_device *dev) 871 { 872 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 873 } 874 875 static int ieee80211_netdev_setup_tc(struct net_device *dev, 876 enum tc_setup_type type, void *type_data) 877 { 878 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 879 struct ieee80211_local *local = sdata->local; 880 881 return drv_net_setup_tc(local, sdata, dev, type, type_data); 882 } 883 884 static const struct net_device_ops ieee80211_dataif_ops = { 885 .ndo_open = ieee80211_open, 886 .ndo_stop = ieee80211_stop, 887 .ndo_uninit = ieee80211_uninit, 888 .ndo_start_xmit = ieee80211_subif_start_xmit, 889 .ndo_set_rx_mode = ieee80211_set_multicast_list, 890 .ndo_set_mac_address = ieee80211_change_mac, 891 .ndo_setup_tc = ieee80211_netdev_setup_tc, 892 }; 893 894 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 895 struct sk_buff *skb, 896 struct net_device *sb_dev) 897 { 898 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 899 struct ieee80211_local *local = sdata->local; 900 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 901 struct ieee80211_hdr *hdr; 902 int len_rthdr; 903 904 if (local->hw.queues < IEEE80211_NUM_ACS) 905 return 0; 906 907 /* reset flags and info before parsing radiotap header */ 908 memset(info, 0, sizeof(*info)); 909 910 if (!ieee80211_parse_tx_radiotap(skb, dev)) 911 return 0; /* doesn't matter, frame will be dropped */ 912 913 len_rthdr = ieee80211_get_radiotap_len(skb->data); 914 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 915 if (skb->len < len_rthdr + 2 || 916 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 917 return 0; /* doesn't matter, frame will be dropped */ 918 919 return ieee80211_select_queue_80211(sdata, skb, hdr); 920 } 921 922 static const struct net_device_ops ieee80211_monitorif_ops = { 923 .ndo_open = ieee80211_open, 924 .ndo_stop = ieee80211_stop, 925 .ndo_uninit = ieee80211_uninit, 926 .ndo_start_xmit = ieee80211_monitor_start_xmit, 927 .ndo_set_rx_mode = ieee80211_set_multicast_list, 928 .ndo_set_mac_address = ieee80211_change_mac, 929 .ndo_select_queue = ieee80211_monitor_select_queue, 930 }; 931 932 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 933 struct net_device_path *path) 934 { 935 struct ieee80211_sub_if_data *sdata; 936 struct ieee80211_local *local; 937 struct sta_info *sta; 938 int ret = -ENOENT; 939 940 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 941 local = sdata->local; 942 943 if (!local->ops->net_fill_forward_path) 944 return -EOPNOTSUPP; 945 946 rcu_read_lock(); 947 switch (sdata->vif.type) { 948 case NL80211_IFTYPE_AP_VLAN: 949 sta = rcu_dereference(sdata->u.vlan.sta); 950 if (sta) 951 break; 952 if (sdata->wdev.use_4addr) 953 goto out; 954 if (is_multicast_ether_addr(ctx->daddr)) 955 goto out; 956 sta = sta_info_get_bss(sdata, ctx->daddr); 957 break; 958 case NL80211_IFTYPE_AP: 959 if (is_multicast_ether_addr(ctx->daddr)) 960 goto out; 961 sta = sta_info_get(sdata, ctx->daddr); 962 break; 963 case NL80211_IFTYPE_STATION: 964 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 965 sta = sta_info_get(sdata, ctx->daddr); 966 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 967 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 968 goto out; 969 970 break; 971 } 972 } 973 974 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 975 break; 976 default: 977 goto out; 978 } 979 980 if (!sta) 981 goto out; 982 983 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 984 out: 985 rcu_read_unlock(); 986 987 return ret; 988 } 989 990 static const struct net_device_ops ieee80211_dataif_8023_ops = { 991 .ndo_open = ieee80211_open, 992 .ndo_stop = ieee80211_stop, 993 .ndo_uninit = ieee80211_uninit, 994 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 995 .ndo_set_rx_mode = ieee80211_set_multicast_list, 996 .ndo_set_mac_address = ieee80211_change_mac, 997 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 998 .ndo_setup_tc = ieee80211_netdev_setup_tc, 999 }; 1000 1001 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 1002 { 1003 switch (iftype) { 1004 /* P2P GO and client are mapped to AP/STATION types */ 1005 case NL80211_IFTYPE_AP: 1006 case NL80211_IFTYPE_STATION: 1007 return true; 1008 default: 1009 return false; 1010 } 1011 } 1012 1013 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 1014 { 1015 struct ieee80211_local *local = sdata->local; 1016 u32 flags; 1017 1018 flags = sdata->vif.offload_flags; 1019 1020 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 1021 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 1022 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 1023 1024 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 1025 local->hw.wiphy->frag_threshold != (u32)-1) 1026 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 1027 1028 if (local->virt_monitors) 1029 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 1030 } else { 1031 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 1032 } 1033 1034 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 1035 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 1036 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 1037 1038 if (local->virt_monitors && 1039 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 1040 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1041 } else { 1042 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1043 } 1044 1045 if (sdata->vif.offload_flags == flags) 1046 return false; 1047 1048 sdata->vif.offload_flags = flags; 1049 ieee80211_check_fast_rx_iface(sdata); 1050 return true; 1051 } 1052 1053 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1054 { 1055 struct ieee80211_local *local = sdata->local; 1056 struct ieee80211_sub_if_data *bss = sdata; 1057 bool enabled; 1058 1059 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1060 if (!sdata->bss) 1061 return; 1062 1063 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1064 } 1065 1066 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1067 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1068 return; 1069 1070 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1071 if (sdata->wdev.use_4addr && 1072 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1073 enabled = false; 1074 1075 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1076 &ieee80211_dataif_ops; 1077 } 1078 1079 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1080 { 1081 struct ieee80211_local *local = sdata->local; 1082 struct ieee80211_sub_if_data *vsdata; 1083 1084 if (ieee80211_set_sdata_offload_flags(sdata)) { 1085 drv_update_vif_offload(local, sdata); 1086 ieee80211_set_vif_encap_ops(sdata); 1087 } 1088 1089 list_for_each_entry(vsdata, &local->interfaces, list) { 1090 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1091 vsdata->bss != &sdata->u.ap) 1092 continue; 1093 1094 ieee80211_set_vif_encap_ops(vsdata); 1095 } 1096 } 1097 1098 void ieee80211_recalc_offload(struct ieee80211_local *local) 1099 { 1100 struct ieee80211_sub_if_data *sdata; 1101 1102 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1103 return; 1104 1105 lockdep_assert_wiphy(local->hw.wiphy); 1106 1107 list_for_each_entry(sdata, &local->interfaces, list) { 1108 if (!ieee80211_sdata_running(sdata)) 1109 continue; 1110 1111 ieee80211_recalc_sdata_offload(sdata); 1112 } 1113 } 1114 1115 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1116 const int offset) 1117 { 1118 struct ieee80211_local *local = sdata->local; 1119 u32 flags = sdata->u.mntr.flags; 1120 1121 #define ADJUST(_f, _s) do { \ 1122 if (flags & MONITOR_FLAG_##_f) \ 1123 local->fif_##_s += offset; \ 1124 } while (0) 1125 1126 ADJUST(FCSFAIL, fcsfail); 1127 ADJUST(PLCPFAIL, plcpfail); 1128 ADJUST(CONTROL, control); 1129 ADJUST(CONTROL, pspoll); 1130 ADJUST(OTHER_BSS, other_bss); 1131 if (!(flags & MONITOR_FLAG_SKIP_TX)) 1132 local->tx_mntrs += offset; 1133 1134 #undef ADJUST 1135 } 1136 1137 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1138 { 1139 struct ieee80211_local *local = sdata->local; 1140 int i; 1141 1142 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1143 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1144 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1145 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1146 sdata->vif.hw_queue[i] = i; 1147 else 1148 sdata->vif.hw_queue[i] = 0; 1149 } 1150 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1151 } 1152 1153 static void ieee80211_sdata_init(struct ieee80211_local *local, 1154 struct ieee80211_sub_if_data *sdata) 1155 { 1156 sdata->local = local; 1157 1158 INIT_LIST_HEAD(&sdata->key_list); 1159 1160 /* 1161 * Initialize the default link, so we can use link_id 0 for non-MLD, 1162 * and that continues to work for non-MLD-aware drivers that use just 1163 * vif.bss_conf instead of vif.link_conf. 1164 * 1165 * Note that we never change this, so if link ID 0 isn't used in an 1166 * MLD connection, we get a separate allocation for it. 1167 */ 1168 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1169 } 1170 1171 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1172 { 1173 struct ieee80211_sub_if_data *sdata; 1174 int ret; 1175 1176 ASSERT_RTNL(); 1177 lockdep_assert_wiphy(local->hw.wiphy); 1178 1179 if (local->monitor_sdata || 1180 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1181 return 0; 1182 1183 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1184 if (!sdata) 1185 return -ENOMEM; 1186 1187 /* set up data */ 1188 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1189 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1190 wiphy_name(local->hw.wiphy)); 1191 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1192 sdata->wdev.wiphy = local->hw.wiphy; 1193 1194 ieee80211_sdata_init(local, sdata); 1195 1196 ieee80211_set_default_queues(sdata); 1197 1198 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1199 ret = drv_add_interface(local, sdata); 1200 if (WARN_ON(ret)) { 1201 /* ok .. stupid driver, it asked for this! */ 1202 kfree(sdata); 1203 return ret; 1204 } 1205 } 1206 1207 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1208 1209 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1210 if (ret) { 1211 kfree(sdata); 1212 return ret; 1213 } 1214 1215 mutex_lock(&local->iflist_mtx); 1216 rcu_assign_pointer(local->monitor_sdata, sdata); 1217 mutex_unlock(&local->iflist_mtx); 1218 1219 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1220 IEEE80211_CHANCTX_EXCLUSIVE); 1221 if (ret) { 1222 mutex_lock(&local->iflist_mtx); 1223 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1224 mutex_unlock(&local->iflist_mtx); 1225 synchronize_net(); 1226 drv_remove_interface(local, sdata); 1227 kfree(sdata); 1228 return ret; 1229 } 1230 1231 skb_queue_head_init(&sdata->skb_queue); 1232 skb_queue_head_init(&sdata->status_queue); 1233 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1234 1235 return 0; 1236 } 1237 1238 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1239 { 1240 struct ieee80211_sub_if_data *sdata; 1241 1242 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1243 return; 1244 1245 ASSERT_RTNL(); 1246 lockdep_assert_wiphy(local->hw.wiphy); 1247 1248 mutex_lock(&local->iflist_mtx); 1249 1250 sdata = rcu_dereference_protected(local->monitor_sdata, 1251 lockdep_is_held(&local->iflist_mtx)); 1252 if (!sdata) { 1253 mutex_unlock(&local->iflist_mtx); 1254 return; 1255 } 1256 1257 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1258 ieee80211_link_release_channel(&sdata->deflink); 1259 1260 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1261 drv_remove_interface(local, sdata); 1262 1263 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1264 mutex_unlock(&local->iflist_mtx); 1265 1266 synchronize_net(); 1267 1268 kfree(sdata); 1269 } 1270 1271 /* 1272 * NOTE: Be very careful when changing this function, it must NOT return 1273 * an error on interface type changes that have been pre-checked, so most 1274 * checks should be in ieee80211_check_concurrent_iface. 1275 */ 1276 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1277 { 1278 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1279 struct net_device *dev = wdev->netdev; 1280 struct ieee80211_local *local = sdata->local; 1281 u64 changed = 0; 1282 int res; 1283 u32 hw_reconf_flags = 0; 1284 1285 lockdep_assert_wiphy(local->hw.wiphy); 1286 1287 switch (sdata->vif.type) { 1288 case NL80211_IFTYPE_AP_VLAN: { 1289 struct ieee80211_sub_if_data *master; 1290 1291 if (!sdata->bss) 1292 return -ENOLINK; 1293 1294 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1295 1296 master = container_of(sdata->bss, 1297 struct ieee80211_sub_if_data, u.ap); 1298 sdata->control_port_protocol = 1299 master->control_port_protocol; 1300 sdata->control_port_no_encrypt = 1301 master->control_port_no_encrypt; 1302 sdata->control_port_over_nl80211 = 1303 master->control_port_over_nl80211; 1304 sdata->control_port_no_preauth = 1305 master->control_port_no_preauth; 1306 sdata->vif.cab_queue = master->vif.cab_queue; 1307 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1308 sizeof(sdata->vif.hw_queue)); 1309 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1310 1311 sdata->crypto_tx_tailroom_needed_cnt += 1312 master->crypto_tx_tailroom_needed_cnt; 1313 1314 ieee80211_apvlan_link_setup(sdata); 1315 1316 break; 1317 } 1318 case NL80211_IFTYPE_AP: 1319 sdata->bss = &sdata->u.ap; 1320 break; 1321 case NL80211_IFTYPE_MESH_POINT: 1322 case NL80211_IFTYPE_STATION: 1323 case NL80211_IFTYPE_MONITOR: 1324 case NL80211_IFTYPE_ADHOC: 1325 case NL80211_IFTYPE_P2P_DEVICE: 1326 case NL80211_IFTYPE_OCB: 1327 case NL80211_IFTYPE_NAN: 1328 /* no special treatment */ 1329 break; 1330 case NL80211_IFTYPE_UNSPECIFIED: 1331 case NUM_NL80211_IFTYPES: 1332 case NL80211_IFTYPE_P2P_CLIENT: 1333 case NL80211_IFTYPE_P2P_GO: 1334 case NL80211_IFTYPE_WDS: 1335 /* cannot happen */ 1336 WARN_ON(1); 1337 break; 1338 } 1339 1340 if (local->open_count == 0) { 1341 /* here we can consider everything in good order (again) */ 1342 local->reconfig_failure = false; 1343 1344 res = drv_start(local); 1345 if (res) 1346 goto err_del_bss; 1347 ieee80211_led_radio(local, true); 1348 ieee80211_mod_tpt_led_trig(local, 1349 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1350 } 1351 1352 /* 1353 * Copy the hopefully now-present MAC address to 1354 * this interface, if it has the special null one. 1355 */ 1356 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1357 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1358 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1359 1360 if (!is_valid_ether_addr(dev->dev_addr)) { 1361 res = -EADDRNOTAVAIL; 1362 goto err_stop; 1363 } 1364 } 1365 1366 sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR || 1367 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE); 1368 switch (sdata->vif.type) { 1369 case NL80211_IFTYPE_AP_VLAN: 1370 /* no need to tell driver, but set carrier and chanctx */ 1371 if (sdata->bss->active) { 1372 struct ieee80211_link_data *link; 1373 1374 for_each_link_data(sdata, link) { 1375 ieee80211_link_vlan_copy_chanctx(link); 1376 } 1377 1378 netif_carrier_on(dev); 1379 ieee80211_set_vif_encap_ops(sdata); 1380 } else { 1381 netif_carrier_off(dev); 1382 } 1383 break; 1384 case NL80211_IFTYPE_MONITOR: 1385 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1386 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1387 res = drv_add_interface(local, sdata); 1388 if (res) 1389 goto err_stop; 1390 } else { 1391 if (local->virt_monitors == 0 && local->open_count == 0) { 1392 res = ieee80211_add_virtual_monitor(local); 1393 if (res) 1394 goto err_stop; 1395 } 1396 local->virt_monitors++; 1397 1398 /* must be before the call to ieee80211_configure_filter */ 1399 if (local->virt_monitors == 1) { 1400 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1401 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1402 } 1403 } 1404 1405 local->monitors++; 1406 1407 ieee80211_adjust_monitor_flags(sdata, 1); 1408 ieee80211_configure_filter(local); 1409 ieee80211_recalc_offload(local); 1410 ieee80211_recalc_idle(local); 1411 1412 netif_carrier_on(dev); 1413 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1414 break; 1415 default: 1416 if (coming_up) { 1417 ieee80211_del_virtual_monitor(local); 1418 ieee80211_set_sdata_offload_flags(sdata); 1419 1420 res = drv_add_interface(local, sdata); 1421 if (res) 1422 goto err_stop; 1423 1424 ieee80211_set_vif_encap_ops(sdata); 1425 res = ieee80211_check_queues(sdata, 1426 ieee80211_vif_type_p2p(&sdata->vif)); 1427 if (res) 1428 goto err_del_interface; 1429 } 1430 1431 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1432 local->fif_pspoll++; 1433 local->fif_probe_req++; 1434 1435 ieee80211_configure_filter(local); 1436 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1437 local->fif_probe_req++; 1438 } 1439 1440 if (sdata->vif.probe_req_reg) 1441 drv_config_iface_filter(local, sdata, 1442 FIF_PROBE_REQ, 1443 FIF_PROBE_REQ); 1444 1445 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1446 sdata->vif.type != NL80211_IFTYPE_NAN) 1447 changed |= ieee80211_reset_erp_info(sdata); 1448 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1449 changed); 1450 1451 switch (sdata->vif.type) { 1452 case NL80211_IFTYPE_STATION: 1453 case NL80211_IFTYPE_ADHOC: 1454 case NL80211_IFTYPE_AP: 1455 case NL80211_IFTYPE_MESH_POINT: 1456 case NL80211_IFTYPE_OCB: 1457 netif_carrier_off(dev); 1458 break; 1459 case NL80211_IFTYPE_P2P_DEVICE: 1460 case NL80211_IFTYPE_NAN: 1461 break; 1462 default: 1463 /* not reached */ 1464 WARN_ON(1); 1465 } 1466 1467 /* 1468 * Set default queue parameters so drivers don't 1469 * need to initialise the hardware if the hardware 1470 * doesn't start up with sane defaults. 1471 * Enable QoS for anything but station interfaces. 1472 */ 1473 ieee80211_set_wmm_default(&sdata->deflink, true, 1474 sdata->vif.type != NL80211_IFTYPE_STATION); 1475 } 1476 1477 /* 1478 * set_multicast_list will be invoked by the networking core 1479 * which will check whether any increments here were done in 1480 * error and sync them down to the hardware as filter flags. 1481 */ 1482 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1483 atomic_inc(&local->iff_allmultis); 1484 1485 if (coming_up) 1486 local->open_count++; 1487 1488 if (local->open_count == 1) 1489 ieee80211_hw_conf_init(local); 1490 else if (hw_reconf_flags) 1491 ieee80211_hw_config(local, -1, hw_reconf_flags); 1492 1493 ieee80211_recalc_ps(local); 1494 1495 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1496 1497 return 0; 1498 err_del_interface: 1499 drv_remove_interface(local, sdata); 1500 err_stop: 1501 if (!local->open_count) 1502 drv_stop(local, false); 1503 err_del_bss: 1504 sdata->bss = NULL; 1505 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1506 list_del(&sdata->u.vlan.list); 1507 /* might already be clear but that doesn't matter */ 1508 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1509 return res; 1510 } 1511 1512 static void ieee80211_if_setup(struct net_device *dev) 1513 { 1514 ether_setup(dev); 1515 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1516 dev->priv_flags |= IFF_NO_QUEUE; 1517 dev->netdev_ops = &ieee80211_dataif_ops; 1518 dev->needs_free_netdev = true; 1519 } 1520 1521 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1522 struct ieee80211_sub_if_data *sdata, 1523 struct sk_buff *skb) 1524 { 1525 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1526 1527 lockdep_assert_wiphy(local->hw.wiphy); 1528 1529 if (ieee80211_is_action(mgmt->frame_control) && 1530 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1531 struct sta_info *sta; 1532 int len = skb->len; 1533 1534 sta = sta_info_get_bss(sdata, mgmt->sa); 1535 if (sta) { 1536 switch (mgmt->u.action.u.addba_req.action_code) { 1537 case WLAN_ACTION_ADDBA_REQ: 1538 ieee80211_process_addba_request(local, sta, 1539 mgmt, len); 1540 break; 1541 case WLAN_ACTION_ADDBA_RESP: 1542 ieee80211_process_addba_resp(local, sta, 1543 mgmt, len); 1544 break; 1545 case WLAN_ACTION_DELBA: 1546 ieee80211_process_delba(sdata, sta, 1547 mgmt, len); 1548 break; 1549 default: 1550 WARN_ON(1); 1551 break; 1552 } 1553 } 1554 } else if (ieee80211_is_action(mgmt->frame_control) && 1555 mgmt->u.action.category == WLAN_CATEGORY_HT) { 1556 switch (mgmt->u.action.u.ht_smps.action) { 1557 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 1558 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 1559 struct ieee80211_rx_status *status; 1560 struct link_sta_info *link_sta; 1561 struct sta_info *sta; 1562 1563 sta = sta_info_get_bss(sdata, mgmt->sa); 1564 if (!sta) 1565 break; 1566 1567 status = IEEE80211_SKB_RXCB(skb); 1568 if (!status->link_valid) 1569 link_sta = &sta->deflink; 1570 else 1571 link_sta = rcu_dereference_protected(sta->link[status->link_id], 1572 lockdep_is_held(&local->hw.wiphy->mtx)); 1573 if (link_sta) 1574 ieee80211_ht_handle_chanwidth_notif(local, sdata, sta, 1575 link_sta, chanwidth, 1576 status->band); 1577 break; 1578 } 1579 default: 1580 WARN_ON(1); 1581 break; 1582 } 1583 } else if (ieee80211_is_action(mgmt->frame_control) && 1584 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1585 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1586 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1587 struct ieee80211_rx_status *status; 1588 enum nl80211_band band; 1589 struct sta_info *sta; 1590 u8 opmode; 1591 1592 status = IEEE80211_SKB_RXCB(skb); 1593 band = status->band; 1594 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1595 1596 sta = sta_info_get_bss(sdata, mgmt->sa); 1597 1598 if (sta) 1599 ieee80211_vht_handle_opmode(sdata, 1600 &sta->deflink, 1601 opmode, band); 1602 1603 break; 1604 } 1605 case WLAN_VHT_ACTION_GROUPID_MGMT: 1606 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1607 mgmt); 1608 break; 1609 default: 1610 WARN_ON(1); 1611 break; 1612 } 1613 } else if (ieee80211_is_action(mgmt->frame_control) && 1614 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1615 switch (mgmt->u.action.u.s1g.action_code) { 1616 case WLAN_S1G_TWT_TEARDOWN: 1617 case WLAN_S1G_TWT_SETUP: 1618 ieee80211_s1g_rx_twt_action(sdata, skb); 1619 break; 1620 default: 1621 break; 1622 } 1623 } else if (ieee80211_is_action(mgmt->frame_control) && 1624 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1625 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1626 switch (mgmt->u.action.u.ttlm_req.action_code) { 1627 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1628 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1629 skb->len); 1630 break; 1631 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1632 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1633 skb->len); 1634 break; 1635 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 1636 ieee80211_process_ttlm_teardown(sdata); 1637 break; 1638 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 1639 ieee80211_process_ml_reconf_resp(sdata, mgmt, 1640 skb->len); 1641 break; 1642 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 1643 ieee80211_process_epcs_ena_resp(sdata, mgmt, 1644 skb->len); 1645 break; 1646 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 1647 ieee80211_process_epcs_teardown(sdata, mgmt, 1648 skb->len); 1649 break; 1650 default: 1651 break; 1652 } 1653 } 1654 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1655 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1656 ieee80211_sta_rx_queued_ext(sdata, skb); 1657 else 1658 WARN_ON(1); 1659 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1660 struct ieee80211_hdr *hdr = (void *)mgmt; 1661 struct sta_info *sta; 1662 1663 /* 1664 * So the frame isn't mgmt, but frame_control 1665 * is at the right place anyway, of course, so 1666 * the if statement is correct. 1667 * 1668 * Warn if we have other data frame types here, 1669 * they must not get here. 1670 */ 1671 WARN_ON(hdr->frame_control & 1672 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1673 WARN_ON(!(hdr->seq_ctrl & 1674 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1675 /* 1676 * This was a fragment of a frame, received while 1677 * a block-ack session was active. That cannot be 1678 * right, so terminate the session. 1679 */ 1680 sta = sta_info_get_bss(sdata, mgmt->sa); 1681 if (sta) { 1682 u16 tid = ieee80211_get_tid(hdr); 1683 1684 __ieee80211_stop_rx_ba_session( 1685 sta, tid, WLAN_BACK_RECIPIENT, 1686 WLAN_REASON_QSTA_REQUIRE_SETUP, 1687 true); 1688 } 1689 } else switch (sdata->vif.type) { 1690 case NL80211_IFTYPE_STATION: 1691 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1692 break; 1693 case NL80211_IFTYPE_ADHOC: 1694 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1695 break; 1696 case NL80211_IFTYPE_MESH_POINT: 1697 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1698 break; 1699 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1700 break; 1701 default: 1702 WARN(1, "frame for unexpected interface type"); 1703 break; 1704 } 1705 } 1706 1707 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1708 struct sk_buff *skb) 1709 { 1710 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1711 1712 if (ieee80211_is_action(mgmt->frame_control) && 1713 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1714 switch (mgmt->u.action.u.s1g.action_code) { 1715 case WLAN_S1G_TWT_TEARDOWN: 1716 case WLAN_S1G_TWT_SETUP: 1717 ieee80211_s1g_status_twt_action(sdata, skb); 1718 break; 1719 default: 1720 break; 1721 } 1722 } 1723 } 1724 1725 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1726 { 1727 struct ieee80211_sub_if_data *sdata = 1728 container_of(work, struct ieee80211_sub_if_data, work); 1729 struct ieee80211_local *local = sdata->local; 1730 struct sk_buff *skb; 1731 1732 if (!ieee80211_sdata_running(sdata)) 1733 return; 1734 1735 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1736 return; 1737 1738 if (!ieee80211_can_run_worker(local)) 1739 return; 1740 1741 /* first process frames */ 1742 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1743 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1744 1745 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1746 ieee80211_process_tdls_channel_switch(sdata, skb); 1747 else 1748 ieee80211_iface_process_skb(local, sdata, skb); 1749 1750 kfree_skb(skb); 1751 kcov_remote_stop(); 1752 } 1753 1754 /* process status queue */ 1755 while ((skb = skb_dequeue(&sdata->status_queue))) { 1756 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1757 1758 ieee80211_iface_process_status(sdata, skb); 1759 kfree_skb(skb); 1760 1761 kcov_remote_stop(); 1762 } 1763 1764 /* then other type-dependent work */ 1765 switch (sdata->vif.type) { 1766 case NL80211_IFTYPE_STATION: 1767 ieee80211_sta_work(sdata); 1768 break; 1769 case NL80211_IFTYPE_ADHOC: 1770 ieee80211_ibss_work(sdata); 1771 break; 1772 case NL80211_IFTYPE_MESH_POINT: 1773 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1774 break; 1775 ieee80211_mesh_work(sdata); 1776 break; 1777 case NL80211_IFTYPE_OCB: 1778 ieee80211_ocb_work(sdata); 1779 break; 1780 default: 1781 break; 1782 } 1783 } 1784 1785 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1786 struct wiphy_work *work) 1787 { 1788 struct ieee80211_sub_if_data *sdata = 1789 container_of(work, struct ieee80211_sub_if_data, 1790 activate_links_work); 1791 struct ieee80211_local *local = wiphy_priv(wiphy); 1792 1793 if (local->in_reconfig) 1794 return; 1795 1796 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1797 sdata->desired_active_links = 0; 1798 } 1799 1800 /* 1801 * Helper function to initialise an interface to a specific type. 1802 */ 1803 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1804 enum nl80211_iftype type) 1805 { 1806 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1807 0xff, 0xff, 0xff}; 1808 1809 /* clear type-dependent unions */ 1810 memset(&sdata->u, 0, sizeof(sdata->u)); 1811 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1812 1813 /* and set some type-dependent values */ 1814 sdata->vif.type = type; 1815 sdata->vif.p2p = false; 1816 sdata->wdev.iftype = type; 1817 1818 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1819 sdata->control_port_no_encrypt = false; 1820 sdata->control_port_over_nl80211 = false; 1821 sdata->control_port_no_preauth = false; 1822 sdata->vif.cfg.idle = true; 1823 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1824 1825 sdata->noack_map = 0; 1826 1827 /* only monitor/p2p-device differ */ 1828 if (sdata->dev) { 1829 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1830 sdata->dev->type = ARPHRD_ETHER; 1831 } 1832 1833 skb_queue_head_init(&sdata->skb_queue); 1834 skb_queue_head_init(&sdata->status_queue); 1835 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1836 wiphy_work_init(&sdata->activate_links_work, 1837 ieee80211_activate_links_work); 1838 1839 switch (type) { 1840 case NL80211_IFTYPE_P2P_GO: 1841 type = NL80211_IFTYPE_AP; 1842 sdata->vif.type = type; 1843 sdata->vif.p2p = true; 1844 fallthrough; 1845 case NL80211_IFTYPE_AP: 1846 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1847 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1848 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1849 break; 1850 case NL80211_IFTYPE_P2P_CLIENT: 1851 type = NL80211_IFTYPE_STATION; 1852 sdata->vif.type = type; 1853 sdata->vif.p2p = true; 1854 fallthrough; 1855 case NL80211_IFTYPE_STATION: 1856 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1857 ieee80211_sta_setup_sdata(sdata); 1858 break; 1859 case NL80211_IFTYPE_OCB: 1860 sdata->vif.bss_conf.bssid = bssid_wildcard; 1861 ieee80211_ocb_setup_sdata(sdata); 1862 break; 1863 case NL80211_IFTYPE_ADHOC: 1864 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1865 ieee80211_ibss_setup_sdata(sdata); 1866 break; 1867 case NL80211_IFTYPE_MESH_POINT: 1868 if (ieee80211_vif_is_mesh(&sdata->vif)) 1869 ieee80211_mesh_init_sdata(sdata); 1870 break; 1871 case NL80211_IFTYPE_MONITOR: 1872 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1873 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1874 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1875 MONITOR_FLAG_OTHER_BSS; 1876 break; 1877 case NL80211_IFTYPE_NAN: 1878 idr_init(&sdata->u.nan.function_inst_ids); 1879 spin_lock_init(&sdata->u.nan.func_lock); 1880 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1881 break; 1882 case NL80211_IFTYPE_AP_VLAN: 1883 case NL80211_IFTYPE_P2P_DEVICE: 1884 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1885 break; 1886 case NL80211_IFTYPE_UNSPECIFIED: 1887 case NL80211_IFTYPE_WDS: 1888 case NUM_NL80211_IFTYPES: 1889 WARN_ON(1); 1890 break; 1891 } 1892 1893 /* need to do this after the switch so vif.type is correct */ 1894 ieee80211_link_setup(&sdata->deflink); 1895 1896 ieee80211_debugfs_recreate_netdev(sdata, false); 1897 } 1898 1899 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1900 enum nl80211_iftype type) 1901 { 1902 struct ieee80211_local *local = sdata->local; 1903 int ret, err; 1904 enum nl80211_iftype internal_type = type; 1905 bool p2p = false; 1906 1907 ASSERT_RTNL(); 1908 1909 if (!local->ops->change_interface) 1910 return -EBUSY; 1911 1912 /* for now, don't support changing while links exist */ 1913 if (ieee80211_vif_is_mld(&sdata->vif)) 1914 return -EBUSY; 1915 1916 switch (sdata->vif.type) { 1917 case NL80211_IFTYPE_AP: 1918 if (!list_empty(&sdata->u.ap.vlans)) 1919 return -EBUSY; 1920 break; 1921 case NL80211_IFTYPE_STATION: 1922 case NL80211_IFTYPE_ADHOC: 1923 case NL80211_IFTYPE_OCB: 1924 /* 1925 * Could maybe also all others here? 1926 * Just not sure how that interacts 1927 * with the RX/config path e.g. for 1928 * mesh. 1929 */ 1930 break; 1931 default: 1932 return -EBUSY; 1933 } 1934 1935 switch (type) { 1936 case NL80211_IFTYPE_AP: 1937 case NL80211_IFTYPE_STATION: 1938 case NL80211_IFTYPE_ADHOC: 1939 case NL80211_IFTYPE_OCB: 1940 /* 1941 * Could probably support everything 1942 * but here. 1943 */ 1944 break; 1945 case NL80211_IFTYPE_P2P_CLIENT: 1946 p2p = true; 1947 internal_type = NL80211_IFTYPE_STATION; 1948 break; 1949 case NL80211_IFTYPE_P2P_GO: 1950 p2p = true; 1951 internal_type = NL80211_IFTYPE_AP; 1952 break; 1953 default: 1954 return -EBUSY; 1955 } 1956 1957 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1958 if (ret) 1959 return ret; 1960 1961 ieee80211_stop_vif_queues(local, sdata, 1962 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1963 /* do_stop will synchronize_rcu() first thing */ 1964 ieee80211_do_stop(sdata, false); 1965 1966 ieee80211_teardown_sdata(sdata); 1967 1968 ieee80211_set_sdata_offload_flags(sdata); 1969 ret = drv_change_interface(local, sdata, internal_type, p2p); 1970 if (ret) 1971 type = ieee80211_vif_type_p2p(&sdata->vif); 1972 1973 /* 1974 * Ignore return value here, there's not much we can do since 1975 * the driver changed the interface type internally already. 1976 * The warnings will hopefully make driver authors fix it :-) 1977 */ 1978 ieee80211_check_queues(sdata, type); 1979 1980 ieee80211_setup_sdata(sdata, type); 1981 ieee80211_set_vif_encap_ops(sdata); 1982 1983 err = ieee80211_do_open(&sdata->wdev, false); 1984 WARN(err, "type change: do_open returned %d", err); 1985 1986 ieee80211_wake_vif_queues(local, sdata, 1987 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1988 return ret; 1989 } 1990 1991 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1992 enum nl80211_iftype type) 1993 { 1994 int ret; 1995 1996 ASSERT_RTNL(); 1997 1998 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1999 return 0; 2000 2001 if (ieee80211_sdata_running(sdata)) { 2002 ret = ieee80211_runtime_change_iftype(sdata, type); 2003 if (ret) 2004 return ret; 2005 } else { 2006 /* Purge and reset type-dependent state. */ 2007 ieee80211_teardown_sdata(sdata); 2008 ieee80211_setup_sdata(sdata, type); 2009 } 2010 2011 /* reset some values that shouldn't be kept across type changes */ 2012 if (type == NL80211_IFTYPE_STATION) 2013 sdata->u.mgd.use_4addr = false; 2014 2015 return 0; 2016 } 2017 2018 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 2019 u8 *perm_addr, enum nl80211_iftype type) 2020 { 2021 struct ieee80211_sub_if_data *sdata; 2022 u64 mask, start, addr, val, inc; 2023 u8 *m; 2024 u8 tmp_addr[ETH_ALEN]; 2025 int i; 2026 2027 lockdep_assert_wiphy(local->hw.wiphy); 2028 2029 /* default ... something at least */ 2030 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 2031 2032 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 2033 local->hw.wiphy->n_addresses <= 1) 2034 return; 2035 2036 switch (type) { 2037 case NL80211_IFTYPE_MONITOR: 2038 /* doesn't matter */ 2039 break; 2040 case NL80211_IFTYPE_AP_VLAN: 2041 /* match up with an AP interface */ 2042 list_for_each_entry(sdata, &local->interfaces, list) { 2043 if (sdata->vif.type != NL80211_IFTYPE_AP) 2044 continue; 2045 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 2046 break; 2047 } 2048 /* keep default if no AP interface present */ 2049 break; 2050 case NL80211_IFTYPE_P2P_CLIENT: 2051 case NL80211_IFTYPE_P2P_GO: 2052 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 2053 list_for_each_entry(sdata, &local->interfaces, list) { 2054 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 2055 continue; 2056 if (!ieee80211_sdata_running(sdata)) 2057 continue; 2058 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 2059 return; 2060 } 2061 } 2062 fallthrough; 2063 default: 2064 /* assign a new address if possible -- try n_addresses first */ 2065 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 2066 bool used = false; 2067 2068 list_for_each_entry(sdata, &local->interfaces, list) { 2069 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 2070 sdata->vif.addr)) { 2071 used = true; 2072 break; 2073 } 2074 } 2075 2076 if (!used) { 2077 memcpy(perm_addr, 2078 local->hw.wiphy->addresses[i].addr, 2079 ETH_ALEN); 2080 break; 2081 } 2082 } 2083 2084 /* try mask if available */ 2085 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 2086 break; 2087 2088 m = local->hw.wiphy->addr_mask; 2089 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2090 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2091 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2092 2093 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2094 /* not a contiguous mask ... not handled now! */ 2095 pr_info("not contiguous\n"); 2096 break; 2097 } 2098 2099 /* 2100 * Pick address of existing interface in case user changed 2101 * MAC address manually, default to perm_addr. 2102 */ 2103 m = local->hw.wiphy->perm_addr; 2104 list_for_each_entry(sdata, &local->interfaces, list) { 2105 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2106 continue; 2107 m = sdata->vif.addr; 2108 break; 2109 } 2110 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2111 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2112 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2113 2114 inc = 1ULL<<__ffs64(mask); 2115 val = (start & mask); 2116 addr = (start & ~mask) | (val & mask); 2117 do { 2118 bool used = false; 2119 2120 tmp_addr[5] = addr >> 0*8; 2121 tmp_addr[4] = addr >> 1*8; 2122 tmp_addr[3] = addr >> 2*8; 2123 tmp_addr[2] = addr >> 3*8; 2124 tmp_addr[1] = addr >> 4*8; 2125 tmp_addr[0] = addr >> 5*8; 2126 2127 val += inc; 2128 2129 list_for_each_entry(sdata, &local->interfaces, list) { 2130 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2131 used = true; 2132 break; 2133 } 2134 } 2135 2136 if (!used) { 2137 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2138 break; 2139 } 2140 addr = (start & ~mask) | (val & mask); 2141 } while (addr != start); 2142 2143 break; 2144 } 2145 } 2146 2147 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2148 unsigned char name_assign_type, 2149 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2150 struct vif_params *params) 2151 { 2152 struct net_device *ndev = NULL; 2153 struct ieee80211_sub_if_data *sdata = NULL; 2154 struct txq_info *txqi; 2155 int ret, i; 2156 2157 ASSERT_RTNL(); 2158 lockdep_assert_wiphy(local->hw.wiphy); 2159 2160 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2161 struct wireless_dev *wdev; 2162 2163 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2164 GFP_KERNEL); 2165 if (!sdata) 2166 return -ENOMEM; 2167 wdev = &sdata->wdev; 2168 2169 sdata->dev = NULL; 2170 strscpy(sdata->name, name, IFNAMSIZ); 2171 ieee80211_assign_perm_addr(local, wdev->address, type); 2172 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2173 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2174 } else { 2175 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2176 sizeof(void *)); 2177 int txq_size = 0; 2178 2179 if (type != NL80211_IFTYPE_AP_VLAN && 2180 (type != NL80211_IFTYPE_MONITOR || 2181 (params->flags & MONITOR_FLAG_ACTIVE))) 2182 txq_size += sizeof(struct txq_info) + 2183 local->hw.txq_data_size; 2184 2185 ndev = alloc_netdev_mqs(size + txq_size, 2186 name, name_assign_type, 2187 ieee80211_if_setup, 1, 1); 2188 if (!ndev) 2189 return -ENOMEM; 2190 2191 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2192 2193 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2194 2195 ndev->needed_headroom = local->tx_headroom + 2196 4*6 /* four MAC addresses */ 2197 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2198 + 6 /* mesh */ 2199 + 8 /* rfc1042/bridge tunnel */ 2200 - ETH_HLEN /* ethernet hard_header_len */ 2201 + IEEE80211_ENCRYPT_HEADROOM; 2202 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2203 2204 ret = dev_alloc_name(ndev, ndev->name); 2205 if (ret < 0) { 2206 free_netdev(ndev); 2207 return ret; 2208 } 2209 2210 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2211 if (is_valid_ether_addr(params->macaddr)) 2212 eth_hw_addr_set(ndev, params->macaddr); 2213 else 2214 eth_hw_addr_set(ndev, ndev->perm_addr); 2215 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2216 2217 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2218 sdata = netdev_priv(ndev); 2219 ndev->ieee80211_ptr = &sdata->wdev; 2220 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2221 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2222 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2223 2224 if (txq_size) { 2225 txqi = netdev_priv(ndev) + size; 2226 ieee80211_txq_init(sdata, NULL, txqi, 0); 2227 } 2228 2229 sdata->dev = ndev; 2230 } 2231 2232 /* initialise type-independent data */ 2233 sdata->wdev.wiphy = local->hw.wiphy; 2234 2235 ieee80211_sdata_init(local, sdata); 2236 2237 ieee80211_init_frag_cache(&sdata->frags); 2238 2239 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2240 ieee80211_delayed_tailroom_dec); 2241 2242 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2243 struct ieee80211_supported_band *sband; 2244 sband = local->hw.wiphy->bands[i]; 2245 sdata->rc_rateidx_mask[i] = 2246 sband ? (1 << sband->n_bitrates) - 1 : 0; 2247 if (sband) { 2248 __le16 cap; 2249 u16 *vht_rate_mask; 2250 2251 memcpy(sdata->rc_rateidx_mcs_mask[i], 2252 sband->ht_cap.mcs.rx_mask, 2253 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2254 2255 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2256 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2257 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2258 } else { 2259 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2260 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2261 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2262 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2263 } 2264 } 2265 2266 ieee80211_set_default_queues(sdata); 2267 2268 /* setup type-dependent data */ 2269 ieee80211_setup_sdata(sdata, type); 2270 2271 if (ndev) { 2272 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2273 if (type == NL80211_IFTYPE_STATION) 2274 sdata->u.mgd.use_4addr = params->use_4addr; 2275 2276 ndev->features |= local->hw.netdev_features; 2277 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2278 ndev->hw_features |= ndev->features & 2279 MAC80211_SUPPORTED_FEATURES_TX; 2280 sdata->vif.netdev_features = local->hw.netdev_features; 2281 2282 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2283 2284 /* MTU range is normally 256 - 2304, where the upper limit is 2285 * the maximum MSDU size. Monitor interfaces send and receive 2286 * MPDU and A-MSDU frames which may be much larger so we do 2287 * not impose an upper limit in that case. 2288 */ 2289 ndev->min_mtu = 256; 2290 if (type == NL80211_IFTYPE_MONITOR) 2291 ndev->max_mtu = 0; 2292 else 2293 ndev->max_mtu = local->hw.max_mtu; 2294 2295 ret = cfg80211_register_netdevice(ndev); 2296 if (ret) { 2297 free_netdev(ndev); 2298 return ret; 2299 } 2300 } 2301 2302 mutex_lock(&local->iflist_mtx); 2303 list_add_tail_rcu(&sdata->list, &local->interfaces); 2304 mutex_unlock(&local->iflist_mtx); 2305 2306 if (new_wdev) 2307 *new_wdev = &sdata->wdev; 2308 2309 return 0; 2310 } 2311 2312 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2313 { 2314 ASSERT_RTNL(); 2315 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2316 2317 mutex_lock(&sdata->local->iflist_mtx); 2318 list_del_rcu(&sdata->list); 2319 mutex_unlock(&sdata->local->iflist_mtx); 2320 2321 if (sdata->vif.txq) 2322 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2323 2324 synchronize_rcu(); 2325 2326 cfg80211_unregister_wdev(&sdata->wdev); 2327 2328 if (!sdata->dev) { 2329 ieee80211_teardown_sdata(sdata); 2330 kfree(sdata); 2331 } 2332 } 2333 2334 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2335 { 2336 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2337 return; 2338 ieee80211_do_stop(sdata, true); 2339 } 2340 2341 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2342 { 2343 struct ieee80211_sub_if_data *sdata, *tmp; 2344 LIST_HEAD(unreg_list); 2345 2346 ASSERT_RTNL(); 2347 2348 /* Before destroying the interfaces, make sure they're all stopped so 2349 * that the hardware is stopped. Otherwise, the driver might still be 2350 * iterating the interfaces during the shutdown, e.g. from a worker 2351 * or from RX processing or similar, and if it does so (using atomic 2352 * iteration) while we're manipulating the list, the iteration will 2353 * crash. 2354 * 2355 * After this, the hardware should be stopped and the driver should 2356 * have stopped all of its activities, so that we can do RCU-unaware 2357 * manipulations of the interface list below. 2358 */ 2359 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2360 2361 guard(wiphy)(local->hw.wiphy); 2362 2363 WARN(local->open_count, "%s: open count remains %d\n", 2364 wiphy_name(local->hw.wiphy), local->open_count); 2365 2366 mutex_lock(&local->iflist_mtx); 2367 list_splice_init(&local->interfaces, &unreg_list); 2368 mutex_unlock(&local->iflist_mtx); 2369 2370 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2371 bool netdev = sdata->dev; 2372 2373 /* 2374 * Remove IP addresses explicitly, since the notifier will 2375 * skip the callbacks if wdev->registered is false, since 2376 * we can't acquire the wiphy_lock() again there if already 2377 * inside this locked section. 2378 */ 2379 sdata->vif.cfg.arp_addr_cnt = 0; 2380 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2381 sdata->u.mgd.associated) 2382 ieee80211_vif_cfg_change_notify(sdata, 2383 BSS_CHANGED_ARP_FILTER); 2384 2385 list_del(&sdata->list); 2386 cfg80211_unregister_wdev(&sdata->wdev); 2387 2388 if (!netdev) 2389 kfree(sdata); 2390 } 2391 } 2392 2393 static int netdev_notify(struct notifier_block *nb, 2394 unsigned long state, void *ptr) 2395 { 2396 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2397 struct ieee80211_sub_if_data *sdata; 2398 2399 if (state != NETDEV_CHANGENAME) 2400 return NOTIFY_DONE; 2401 2402 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2403 return NOTIFY_DONE; 2404 2405 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2406 return NOTIFY_DONE; 2407 2408 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2409 memcpy(sdata->name, dev->name, IFNAMSIZ); 2410 ieee80211_debugfs_rename_netdev(sdata); 2411 2412 return NOTIFY_OK; 2413 } 2414 2415 static struct notifier_block mac80211_netdev_notifier = { 2416 .notifier_call = netdev_notify, 2417 }; 2418 2419 int ieee80211_iface_init(void) 2420 { 2421 return register_netdevice_notifier(&mac80211_netdev_notifier); 2422 } 2423 2424 void ieee80211_iface_exit(void) 2425 { 2426 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2427 } 2428 2429 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2430 { 2431 if (sdata->vif.type == NL80211_IFTYPE_AP) 2432 atomic_inc(&sdata->u.ap.num_mcast_sta); 2433 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2434 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2435 } 2436 2437 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2438 { 2439 if (sdata->vif.type == NL80211_IFTYPE_AP) 2440 atomic_dec(&sdata->u.ap.num_mcast_sta); 2441 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2442 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2443 } 2444 2445 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2446 { 2447 struct ieee80211_local *local = sdata->local; 2448 2449 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2450 return; 2451 2452 ieee80211_stop_vif_queues_norefcount(local, sdata, 2453 IEEE80211_QUEUE_STOP_REASON_CSA); 2454 } 2455 2456 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2457 { 2458 struct ieee80211_local *local = sdata->local; 2459 2460 ieee80211_wake_vif_queues_norefcount(local, sdata, 2461 IEEE80211_QUEUE_STOP_REASON_CSA); 2462 } 2463