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; 110 111 lockdep_assert_wiphy(local->hw.wiphy); 112 113 active = force_active || 114 !list_empty(&local->chanctx_list) || 115 local->monitors; 116 117 working = !local->ops->remain_on_channel && 118 !list_empty(&local->roc_list); 119 120 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 121 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 122 123 if (working || scanning) 124 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 125 else 126 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 127 128 if (active) 129 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 130 else 131 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 132 133 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 134 135 if (working || scanning || active) 136 return __ieee80211_idle_off(local); 137 return __ieee80211_idle_on(local); 138 } 139 140 u32 ieee80211_idle_off(struct ieee80211_local *local) 141 { 142 return __ieee80211_recalc_idle(local, true); 143 } 144 145 void ieee80211_recalc_idle(struct ieee80211_local *local) 146 { 147 u32 change = __ieee80211_recalc_idle(local, false); 148 if (change) 149 ieee80211_hw_config(local, -1, change); 150 } 151 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 153 bool check_dup) 154 { 155 struct ieee80211_local *local = sdata->local; 156 struct ieee80211_sub_if_data *iter; 157 u64 new, mask, tmp; 158 u8 *m; 159 int ret = 0; 160 161 lockdep_assert_wiphy(local->hw.wiphy); 162 163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 164 return 0; 165 166 m = addr; 167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 170 171 m = local->hw.wiphy->addr_mask; 172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 175 176 if (!check_dup) 177 return ret; 178 179 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 } 197 198 return ret; 199 } 200 201 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 202 { 203 struct ieee80211_roc_work *roc; 204 struct ieee80211_local *local = sdata->local; 205 struct ieee80211_sub_if_data *scan_sdata; 206 int ret = 0; 207 208 lockdep_assert_wiphy(local->hw.wiphy); 209 210 /* To be the most flexible here we want to only limit changing the 211 * address if the specific interface is doing offchannel work or 212 * scanning. 213 */ 214 if (netif_carrier_ok(sdata->dev)) 215 return -EBUSY; 216 217 /* First check no ROC work is happening on this iface */ 218 list_for_each_entry(roc, &local->roc_list, list) { 219 if (roc->sdata != sdata) 220 continue; 221 222 if (roc->started) { 223 ret = -EBUSY; 224 goto unlock; 225 } 226 } 227 228 /* And if this iface is scanning */ 229 if (local->scanning) { 230 scan_sdata = rcu_dereference_protected(local->scan_sdata, 231 lockdep_is_held(&local->hw.wiphy->mtx)); 232 if (sdata == scan_sdata) 233 ret = -EBUSY; 234 } 235 236 switch (sdata->vif.type) { 237 case NL80211_IFTYPE_STATION: 238 case NL80211_IFTYPE_P2P_CLIENT: 239 /* More interface types could be added here but changing the 240 * address while powered makes the most sense in client modes. 241 */ 242 break; 243 default: 244 ret = -EOPNOTSUPP; 245 } 246 247 unlock: 248 return ret; 249 } 250 251 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata, 252 void *addr) 253 { 254 struct ieee80211_local *local = sdata->local; 255 struct sockaddr *sa = addr; 256 bool check_dup = true; 257 bool live = false; 258 int ret; 259 260 if (ieee80211_sdata_running(sdata)) { 261 ret = ieee80211_can_powered_addr_change(sdata); 262 if (ret) 263 return ret; 264 265 live = true; 266 } 267 268 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 269 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 270 check_dup = false; 271 272 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 273 if (ret) 274 return ret; 275 276 if (live) 277 drv_remove_interface(local, sdata); 278 ret = eth_mac_addr(sdata->dev, sa); 279 280 if (ret == 0) { 281 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 282 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 283 } 284 285 /* Regardless of eth_mac_addr() return we still want to add the 286 * interface back. This should not fail... 287 */ 288 if (live) 289 WARN_ON(drv_add_interface(local, sdata)); 290 291 return ret; 292 } 293 294 static int ieee80211_change_mac(struct net_device *dev, void *addr) 295 { 296 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 297 struct ieee80211_local *local = sdata->local; 298 299 /* 300 * This happens during unregistration if there's a bond device 301 * active (maybe other cases?) and we must get removed from it. 302 * But we really don't care anymore if it's not registered now. 303 */ 304 if (!dev->ieee80211_ptr->registered) 305 return 0; 306 307 guard(wiphy)(local->hw.wiphy); 308 309 return _ieee80211_change_mac(sdata, addr); 310 } 311 312 static inline int identical_mac_addr_allowed(int type1, int type2) 313 { 314 return type1 == NL80211_IFTYPE_MONITOR || 315 type2 == NL80211_IFTYPE_MONITOR || 316 type1 == NL80211_IFTYPE_P2P_DEVICE || 317 type2 == NL80211_IFTYPE_P2P_DEVICE || 318 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 319 (type1 == NL80211_IFTYPE_AP_VLAN && 320 (type2 == NL80211_IFTYPE_AP || 321 type2 == NL80211_IFTYPE_AP_VLAN)); 322 } 323 324 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 325 enum nl80211_iftype iftype) 326 { 327 struct ieee80211_local *local = sdata->local; 328 struct ieee80211_sub_if_data *nsdata; 329 330 ASSERT_RTNL(); 331 lockdep_assert_wiphy(local->hw.wiphy); 332 333 /* we hold the RTNL here so can safely walk the list */ 334 list_for_each_entry(nsdata, &local->interfaces, list) { 335 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 336 /* 337 * Only OCB and monitor mode may coexist 338 */ 339 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 340 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 341 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 342 nsdata->vif.type == NL80211_IFTYPE_OCB)) 343 return -EBUSY; 344 345 /* 346 * Allow only a single IBSS interface to be up at any 347 * time. This is restricted because beacon distribution 348 * cannot work properly if both are in the same IBSS. 349 * 350 * To remove this restriction we'd have to disallow them 351 * from setting the same SSID on different IBSS interfaces 352 * belonging to the same hardware. Then, however, we're 353 * faced with having to adopt two different TSF timers... 354 */ 355 if (iftype == NL80211_IFTYPE_ADHOC && 356 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 357 return -EBUSY; 358 /* 359 * will not add another interface while any channel 360 * switch is active. 361 */ 362 if (nsdata->vif.bss_conf.csa_active) 363 return -EBUSY; 364 365 /* 366 * The remaining checks are only performed for interfaces 367 * with the same MAC address. 368 */ 369 if (!ether_addr_equal(sdata->vif.addr, 370 nsdata->vif.addr)) 371 continue; 372 373 /* 374 * check whether it may have the same address 375 */ 376 if (!identical_mac_addr_allowed(iftype, 377 nsdata->vif.type)) 378 return -ENOTUNIQ; 379 380 /* No support for VLAN with MLO yet */ 381 if (iftype == NL80211_IFTYPE_AP_VLAN && 382 sdata->wdev.use_4addr && 383 nsdata->vif.type == NL80211_IFTYPE_AP && 384 nsdata->vif.valid_links) 385 return -EOPNOTSUPP; 386 387 /* 388 * can only add VLANs to enabled APs 389 */ 390 if (iftype == NL80211_IFTYPE_AP_VLAN && 391 nsdata->vif.type == NL80211_IFTYPE_AP) 392 sdata->bss = &nsdata->u.ap; 393 } 394 } 395 396 return ieee80211_check_combinations(sdata, NULL, 0, 0, -1); 397 } 398 399 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 400 enum nl80211_iftype iftype) 401 { 402 int n_queues = sdata->local->hw.queues; 403 int i; 404 405 if (iftype == NL80211_IFTYPE_NAN) 406 return 0; 407 408 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 409 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 410 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 411 IEEE80211_INVAL_HW_QUEUE)) 412 return -EINVAL; 413 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 414 n_queues)) 415 return -EINVAL; 416 } 417 } 418 419 if ((iftype != NL80211_IFTYPE_AP && 420 iftype != NL80211_IFTYPE_P2P_GO && 421 iftype != NL80211_IFTYPE_MESH_POINT) || 422 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 423 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 424 return 0; 425 } 426 427 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 428 return -EINVAL; 429 430 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 431 return -EINVAL; 432 433 return 0; 434 } 435 436 static int ieee80211_open(struct net_device *dev) 437 { 438 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 439 int err; 440 441 /* fail early if user set an invalid address */ 442 if (!is_valid_ether_addr(dev->dev_addr)) 443 return -EADDRNOTAVAIL; 444 445 guard(wiphy)(sdata->local->hw.wiphy); 446 447 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 448 if (err) 449 return err; 450 451 return ieee80211_do_open(&sdata->wdev, true); 452 } 453 454 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 455 { 456 struct ieee80211_local *local = sdata->local; 457 unsigned long flags; 458 struct sk_buff_head freeq; 459 struct sk_buff *skb, *tmp; 460 u32 hw_reconf_flags = 0; 461 int i, flushed; 462 struct ps_data *ps; 463 struct cfg80211_chan_def chandef; 464 bool cancel_scan; 465 struct cfg80211_nan_func *func; 466 467 lockdep_assert_wiphy(local->hw.wiphy); 468 469 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 470 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 471 472 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 473 if (cancel_scan) 474 ieee80211_scan_cancel(local); 475 476 ieee80211_roc_purge(local, sdata); 477 478 switch (sdata->vif.type) { 479 case NL80211_IFTYPE_STATION: 480 ieee80211_mgd_stop(sdata); 481 break; 482 case NL80211_IFTYPE_ADHOC: 483 ieee80211_ibss_stop(sdata); 484 break; 485 case NL80211_IFTYPE_MONITOR: 486 list_del_rcu(&sdata->u.mntr.list); 487 break; 488 case NL80211_IFTYPE_AP_VLAN: 489 ieee80211_apvlan_link_clear(sdata); 490 break; 491 default: 492 break; 493 } 494 495 /* 496 * Remove all stations associated with this interface. 497 * 498 * This must be done before calling ops->remove_interface() 499 * because otherwise we can later invoke ops->sta_notify() 500 * whenever the STAs are removed, and that invalidates driver 501 * assumptions about always getting a vif pointer that is valid 502 * (because if we remove a STA after ops->remove_interface() 503 * the driver will have removed the vif info already!) 504 * 505 * For AP_VLANs stations may exist since there's nothing else that 506 * would have removed them, but in other modes there shouldn't 507 * be any stations. 508 */ 509 flushed = sta_info_flush(sdata, -1); 510 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 511 512 /* don't count this interface for allmulti while it is down */ 513 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 514 atomic_dec(&local->iff_allmultis); 515 516 if (sdata->vif.type == NL80211_IFTYPE_AP) { 517 local->fif_pspoll--; 518 local->fif_probe_req--; 519 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 520 local->fif_probe_req--; 521 } 522 523 if (sdata->dev) { 524 netif_addr_lock_bh(sdata->dev); 525 spin_lock_bh(&local->filter_lock); 526 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 527 sdata->dev->addr_len); 528 spin_unlock_bh(&local->filter_lock); 529 netif_addr_unlock_bh(sdata->dev); 530 } 531 532 timer_delete_sync(&local->dynamic_ps_timer); 533 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 534 535 WARN(ieee80211_vif_is_mld(&sdata->vif), 536 "destroying interface with valid links 0x%04x\n", 537 sdata->vif.valid_links); 538 539 sdata->vif.bss_conf.csa_active = false; 540 if (sdata->vif.type == NL80211_IFTYPE_STATION) 541 sdata->deflink.u.mgd.csa.waiting_bcn = false; 542 ieee80211_vif_unblock_queues_csa(sdata); 543 544 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); 545 wiphy_work_cancel(local->hw.wiphy, 546 &sdata->deflink.color_change_finalize_work); 547 wiphy_delayed_work_cancel(local->hw.wiphy, 548 &sdata->deflink.dfs_cac_timer_work); 549 550 if (sdata->wdev.links[0].cac_started) { 551 chandef = sdata->vif.bss_conf.chanreq.oper; 552 WARN_ON(local->suspended); 553 ieee80211_link_release_channel(&sdata->deflink); 554 cfg80211_cac_event(sdata->dev, &chandef, 555 NL80211_RADAR_CAC_ABORTED, 556 GFP_KERNEL, 0); 557 } 558 559 if (sdata->vif.type == NL80211_IFTYPE_AP) { 560 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 561 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 562 /* remove all packets in parent bc_buf pointing to this dev */ 563 ps = &sdata->bss->ps; 564 565 spin_lock_irqsave(&ps->bc_buf.lock, flags); 566 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 567 if (skb->dev == sdata->dev) { 568 __skb_unlink(skb, &ps->bc_buf); 569 local->total_ps_buffered--; 570 ieee80211_free_txskb(&local->hw, skb); 571 } 572 } 573 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 574 } 575 576 if (going_down) 577 local->open_count--; 578 579 switch (sdata->vif.type) { 580 case NL80211_IFTYPE_AP_VLAN: 581 list_del(&sdata->u.vlan.list); 582 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 583 /* see comment in the default case below */ 584 ieee80211_free_keys(sdata, true); 585 /* no need to tell driver */ 586 break; 587 case NL80211_IFTYPE_MONITOR: 588 local->monitors--; 589 590 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 591 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 592 593 local->virt_monitors--; 594 if (local->virt_monitors == 0) { 595 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 596 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 597 } 598 599 ieee80211_adjust_monitor_flags(sdata, -1); 600 } 601 break; 602 case NL80211_IFTYPE_NAN: 603 /* clean all the functions */ 604 spin_lock_bh(&sdata->u.nan.func_lock); 605 606 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 607 idr_remove(&sdata->u.nan.function_inst_ids, i); 608 cfg80211_free_nan_func(func); 609 } 610 idr_destroy(&sdata->u.nan.function_inst_ids); 611 612 spin_unlock_bh(&sdata->u.nan.func_lock); 613 break; 614 case NL80211_IFTYPE_P2P_DEVICE: 615 /* relies on synchronize_rcu() below */ 616 RCU_INIT_POINTER(local->p2p_sdata, NULL); 617 fallthrough; 618 default: 619 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 620 /* 621 * When we get here, the interface is marked down. 622 * Free the remaining keys, if there are any 623 * (which can happen in AP mode if userspace sets 624 * keys before the interface is operating) 625 * 626 * Force the key freeing to always synchronize_net() 627 * to wait for the RX path in case it is using this 628 * interface enqueuing frames at this very time on 629 * another CPU. 630 */ 631 ieee80211_free_keys(sdata, true); 632 skb_queue_purge(&sdata->skb_queue); 633 skb_queue_purge(&sdata->status_queue); 634 } 635 636 /* 637 * Since ieee80211_free_txskb() may issue __dev_queue_xmit() 638 * which should be called with interrupts enabled, reclamation 639 * is done in two phases: 640 */ 641 __skb_queue_head_init(&freeq); 642 643 /* unlink from local queues... */ 644 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 645 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 646 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 647 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 648 if (info->control.vif == &sdata->vif) { 649 __skb_unlink(skb, &local->pending[i]); 650 __skb_queue_tail(&freeq, skb); 651 } 652 } 653 } 654 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 655 656 /* ... and perform actual reclamation with interrupts enabled. */ 657 skb_queue_walk_safe(&freeq, skb, tmp) { 658 __skb_unlink(skb, &freeq); 659 ieee80211_free_txskb(&local->hw, skb); 660 } 661 662 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 663 ieee80211_txq_remove_vlan(local, sdata); 664 665 if (sdata->vif.txq) 666 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 667 668 sdata->bss = NULL; 669 670 if (local->open_count == 0) 671 ieee80211_clear_tx_pending(local); 672 673 sdata->vif.bss_conf.beacon_int = 0; 674 675 /* 676 * If the interface goes down while suspended, presumably because 677 * the device was unplugged and that happens before our resume, 678 * then the driver is already unconfigured and the remainder of 679 * this function isn't needed. 680 * XXX: what about WoWLAN? If the device has software state, e.g. 681 * memory allocated, it might expect teardown commands from 682 * mac80211 here? 683 */ 684 if (local->suspended) { 685 WARN_ON(local->wowlan); 686 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 687 return; 688 } 689 690 switch (sdata->vif.type) { 691 case NL80211_IFTYPE_AP_VLAN: 692 break; 693 case NL80211_IFTYPE_MONITOR: 694 if (local->virt_monitors == 0) 695 ieee80211_del_virtual_monitor(local); 696 697 ieee80211_recalc_idle(local); 698 ieee80211_recalc_offload(local); 699 700 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 701 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 702 break; 703 704 ieee80211_link_release_channel(&sdata->deflink); 705 fallthrough; 706 default: 707 if (!going_down) 708 break; 709 drv_remove_interface(local, sdata); 710 711 /* Clear private driver data to prevent reuse */ 712 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); 713 } 714 715 ieee80211_recalc_ps(local); 716 717 if (cancel_scan) 718 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 719 720 if (local->open_count == 0) { 721 ieee80211_stop_device(local, false); 722 723 /* no reconfiguring after stop! */ 724 return; 725 } 726 727 /* do after stop to avoid reconfiguring when we stop anyway */ 728 ieee80211_configure_filter(local); 729 ieee80211_hw_config(local, -1, hw_reconf_flags); 730 731 if (local->virt_monitors == local->open_count) 732 ieee80211_add_virtual_monitor(local); 733 } 734 735 void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 736 { 737 struct ieee80211_sub_if_data *tx_sdata; 738 struct ieee80211_bss_conf *link_conf, *tx_bss_conf; 739 struct ieee80211_link_data *tx_link, *link; 740 unsigned int link_id; 741 742 lockdep_assert_wiphy(sdata->local->hw.wiphy); 743 744 /* Check if any of the links of current sdata is an MBSSID. */ 745 for_each_vif_active_link(&sdata->vif, link_conf, link_id) { 746 tx_bss_conf = sdata_dereference(link_conf->tx_bss_conf, sdata); 747 if (!tx_bss_conf) 748 continue; 749 750 tx_sdata = vif_to_sdata(tx_bss_conf->vif); 751 RCU_INIT_POINTER(link_conf->tx_bss_conf, NULL); 752 753 /* If we are not tx sdata reset tx sdata's tx_bss_conf to avoid recusrion 754 * while closing tx sdata at the end of outer loop below. 755 */ 756 if (sdata != tx_sdata) { 757 tx_link = sdata_dereference(tx_sdata->link[tx_bss_conf->link_id], 758 tx_sdata); 759 if (!tx_link) 760 continue; 761 762 RCU_INIT_POINTER(tx_link->conf->tx_bss_conf, NULL); 763 } 764 765 /* loop through sdatas to find if any of their links 766 * belong to same MBSSID set as the one getting deleted. 767 */ 768 for_each_sdata_link(tx_sdata->local, link) { 769 struct ieee80211_sub_if_data *link_sdata = link->sdata; 770 771 if (link_sdata == sdata || link_sdata == tx_sdata || 772 rcu_access_pointer(link->conf->tx_bss_conf) != tx_bss_conf) 773 continue; 774 775 RCU_INIT_POINTER(link->conf->tx_bss_conf, NULL); 776 777 /* Remove all links of matching MLD until dynamic link 778 * removal can be supported. 779 */ 780 cfg80211_stop_iface(link_sdata->wdev.wiphy, &link_sdata->wdev, 781 GFP_KERNEL); 782 } 783 784 /* If we are not tx sdata, remove links of tx sdata and proceed */ 785 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) 786 cfg80211_stop_iface(tx_sdata->wdev.wiphy, 787 &tx_sdata->wdev, GFP_KERNEL); 788 } 789 } 790 791 static int ieee80211_stop(struct net_device *dev) 792 { 793 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 794 795 /* close dependent VLAN interfaces before locking wiphy */ 796 if (sdata->vif.type == NL80211_IFTYPE_AP) { 797 struct ieee80211_sub_if_data *vlan, *tmpsdata; 798 799 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 800 u.vlan.list) 801 dev_close(vlan->dev); 802 } 803 804 guard(wiphy)(sdata->local->hw.wiphy); 805 806 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 807 808 /* Close the dependent MBSSID interfaces with wiphy lock as we may be 809 * terminating its partner links too in case of MLD. 810 */ 811 if (sdata->vif.type == NL80211_IFTYPE_AP) 812 ieee80211_stop_mbssid(sdata); 813 814 ieee80211_do_stop(sdata, true); 815 816 return 0; 817 } 818 819 static void ieee80211_set_multicast_list(struct net_device *dev) 820 { 821 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 822 struct ieee80211_local *local = sdata->local; 823 int allmulti, sdata_allmulti; 824 825 allmulti = !!(dev->flags & IFF_ALLMULTI); 826 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 827 828 if (allmulti != sdata_allmulti) { 829 if (dev->flags & IFF_ALLMULTI) 830 atomic_inc(&local->iff_allmultis); 831 else 832 atomic_dec(&local->iff_allmultis); 833 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 834 } 835 836 spin_lock_bh(&local->filter_lock); 837 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 838 spin_unlock_bh(&local->filter_lock); 839 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 840 } 841 842 /* 843 * Called when the netdev is removed or, by the code below, before 844 * the interface type changes. 845 */ 846 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 847 { 848 if (WARN_ON(!list_empty(&sdata->work.entry))) 849 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 850 851 /* free extra data */ 852 ieee80211_free_keys(sdata, false); 853 854 ieee80211_debugfs_remove_netdev(sdata); 855 856 ieee80211_destroy_frag_cache(&sdata->frags); 857 858 if (ieee80211_vif_is_mesh(&sdata->vif)) 859 ieee80211_mesh_teardown_sdata(sdata); 860 861 ieee80211_vif_clear_links(sdata); 862 ieee80211_link_stop(&sdata->deflink); 863 } 864 865 static void ieee80211_uninit(struct net_device *dev) 866 { 867 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 868 } 869 870 static int ieee80211_netdev_setup_tc(struct net_device *dev, 871 enum tc_setup_type type, void *type_data) 872 { 873 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 874 struct ieee80211_local *local = sdata->local; 875 876 return drv_net_setup_tc(local, sdata, dev, type, type_data); 877 } 878 879 static const struct net_device_ops ieee80211_dataif_ops = { 880 .ndo_open = ieee80211_open, 881 .ndo_stop = ieee80211_stop, 882 .ndo_uninit = ieee80211_uninit, 883 .ndo_start_xmit = ieee80211_subif_start_xmit, 884 .ndo_set_rx_mode = ieee80211_set_multicast_list, 885 .ndo_set_mac_address = ieee80211_change_mac, 886 .ndo_setup_tc = ieee80211_netdev_setup_tc, 887 }; 888 889 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 890 struct sk_buff *skb, 891 struct net_device *sb_dev) 892 { 893 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 894 struct ieee80211_local *local = sdata->local; 895 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 896 struct ieee80211_hdr *hdr; 897 int len_rthdr; 898 899 if (local->hw.queues < IEEE80211_NUM_ACS) 900 return 0; 901 902 /* reset flags and info before parsing radiotap header */ 903 memset(info, 0, sizeof(*info)); 904 905 if (!ieee80211_parse_tx_radiotap(skb, dev)) 906 return 0; /* doesn't matter, frame will be dropped */ 907 908 len_rthdr = ieee80211_get_radiotap_len(skb->data); 909 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 910 if (skb->len < len_rthdr + 2 || 911 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 912 return 0; /* doesn't matter, frame will be dropped */ 913 914 return ieee80211_select_queue_80211(sdata, skb, hdr); 915 } 916 917 static const struct net_device_ops ieee80211_monitorif_ops = { 918 .ndo_open = ieee80211_open, 919 .ndo_stop = ieee80211_stop, 920 .ndo_uninit = ieee80211_uninit, 921 .ndo_start_xmit = ieee80211_monitor_start_xmit, 922 .ndo_set_rx_mode = ieee80211_set_multicast_list, 923 .ndo_set_mac_address = ieee80211_change_mac, 924 .ndo_select_queue = ieee80211_monitor_select_queue, 925 }; 926 927 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 928 struct net_device_path *path) 929 { 930 struct ieee80211_sub_if_data *sdata; 931 struct ieee80211_local *local; 932 struct sta_info *sta; 933 int ret = -ENOENT; 934 935 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 936 local = sdata->local; 937 938 if (!local->ops->net_fill_forward_path) 939 return -EOPNOTSUPP; 940 941 rcu_read_lock(); 942 switch (sdata->vif.type) { 943 case NL80211_IFTYPE_AP_VLAN: 944 sta = rcu_dereference(sdata->u.vlan.sta); 945 if (sta) 946 break; 947 if (sdata->wdev.use_4addr) 948 goto out; 949 if (is_multicast_ether_addr(ctx->daddr)) 950 goto out; 951 sta = sta_info_get_bss(sdata, ctx->daddr); 952 break; 953 case NL80211_IFTYPE_AP: 954 if (is_multicast_ether_addr(ctx->daddr)) 955 goto out; 956 sta = sta_info_get(sdata, ctx->daddr); 957 break; 958 case NL80211_IFTYPE_STATION: 959 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 960 sta = sta_info_get(sdata, ctx->daddr); 961 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 962 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 963 goto out; 964 965 break; 966 } 967 } 968 969 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 970 break; 971 default: 972 goto out; 973 } 974 975 if (!sta) 976 goto out; 977 978 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 979 out: 980 rcu_read_unlock(); 981 982 return ret; 983 } 984 985 static const struct net_device_ops ieee80211_dataif_8023_ops = { 986 .ndo_open = ieee80211_open, 987 .ndo_stop = ieee80211_stop, 988 .ndo_uninit = ieee80211_uninit, 989 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 990 .ndo_set_rx_mode = ieee80211_set_multicast_list, 991 .ndo_set_mac_address = ieee80211_change_mac, 992 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 993 .ndo_setup_tc = ieee80211_netdev_setup_tc, 994 }; 995 996 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 997 { 998 switch (iftype) { 999 /* P2P GO and client are mapped to AP/STATION types */ 1000 case NL80211_IFTYPE_AP: 1001 case NL80211_IFTYPE_STATION: 1002 return true; 1003 default: 1004 return false; 1005 } 1006 } 1007 1008 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 1009 { 1010 struct ieee80211_local *local = sdata->local; 1011 u32 flags; 1012 1013 flags = sdata->vif.offload_flags; 1014 1015 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 1016 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 1017 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 1018 1019 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 1020 local->hw.wiphy->frag_threshold != (u32)-1) 1021 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 1022 1023 if (local->virt_monitors) 1024 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 1025 } else { 1026 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 1027 } 1028 1029 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 1030 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 1031 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 1032 1033 if (local->virt_monitors && 1034 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 1035 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1036 } else { 1037 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1038 } 1039 1040 if (sdata->vif.offload_flags == flags) 1041 return false; 1042 1043 sdata->vif.offload_flags = flags; 1044 ieee80211_check_fast_rx_iface(sdata); 1045 return true; 1046 } 1047 1048 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1049 { 1050 struct ieee80211_local *local = sdata->local; 1051 struct ieee80211_sub_if_data *bss = sdata; 1052 bool enabled; 1053 1054 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1055 if (!sdata->bss) 1056 return; 1057 1058 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1059 } 1060 1061 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1062 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1063 return; 1064 1065 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1066 if (sdata->wdev.use_4addr && 1067 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1068 enabled = false; 1069 1070 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1071 &ieee80211_dataif_ops; 1072 } 1073 1074 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1075 { 1076 struct ieee80211_local *local = sdata->local; 1077 struct ieee80211_sub_if_data *vsdata; 1078 1079 if (ieee80211_set_sdata_offload_flags(sdata)) { 1080 drv_update_vif_offload(local, sdata); 1081 ieee80211_set_vif_encap_ops(sdata); 1082 } 1083 1084 list_for_each_entry(vsdata, &local->interfaces, list) { 1085 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1086 vsdata->bss != &sdata->u.ap) 1087 continue; 1088 1089 ieee80211_set_vif_encap_ops(vsdata); 1090 } 1091 } 1092 1093 void ieee80211_recalc_offload(struct ieee80211_local *local) 1094 { 1095 struct ieee80211_sub_if_data *sdata; 1096 1097 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1098 return; 1099 1100 lockdep_assert_wiphy(local->hw.wiphy); 1101 1102 list_for_each_entry(sdata, &local->interfaces, list) { 1103 if (!ieee80211_sdata_running(sdata)) 1104 continue; 1105 1106 ieee80211_recalc_sdata_offload(sdata); 1107 } 1108 } 1109 1110 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1111 const int offset) 1112 { 1113 struct ieee80211_local *local = sdata->local; 1114 u32 flags = sdata->u.mntr.flags; 1115 1116 #define ADJUST(_f, _s) do { \ 1117 if (flags & MONITOR_FLAG_##_f) \ 1118 local->fif_##_s += offset; \ 1119 } while (0) 1120 1121 ADJUST(FCSFAIL, fcsfail); 1122 ADJUST(PLCPFAIL, plcpfail); 1123 ADJUST(CONTROL, control); 1124 ADJUST(CONTROL, pspoll); 1125 ADJUST(OTHER_BSS, other_bss); 1126 if (!(flags & MONITOR_FLAG_SKIP_TX)) 1127 local->tx_mntrs += offset; 1128 1129 #undef ADJUST 1130 } 1131 1132 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1133 { 1134 struct ieee80211_local *local = sdata->local; 1135 int i; 1136 1137 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1138 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1139 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1140 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1141 sdata->vif.hw_queue[i] = i; 1142 else 1143 sdata->vif.hw_queue[i] = 0; 1144 } 1145 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1146 } 1147 1148 static void ieee80211_sdata_init(struct ieee80211_local *local, 1149 struct ieee80211_sub_if_data *sdata) 1150 { 1151 sdata->local = local; 1152 1153 INIT_LIST_HEAD(&sdata->key_list); 1154 1155 /* 1156 * Initialize the default link, so we can use link_id 0 for non-MLD, 1157 * and that continues to work for non-MLD-aware drivers that use just 1158 * vif.bss_conf instead of vif.link_conf. 1159 * 1160 * Note that we never change this, so if link ID 0 isn't used in an 1161 * MLD connection, we get a separate allocation for it. 1162 */ 1163 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1164 } 1165 1166 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1167 { 1168 struct ieee80211_sub_if_data *sdata; 1169 int ret; 1170 1171 ASSERT_RTNL(); 1172 lockdep_assert_wiphy(local->hw.wiphy); 1173 1174 if (local->monitor_sdata || 1175 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1176 return 0; 1177 1178 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1179 if (!sdata) 1180 return -ENOMEM; 1181 1182 /* set up data */ 1183 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1184 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1185 wiphy_name(local->hw.wiphy)); 1186 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1187 sdata->wdev.wiphy = local->hw.wiphy; 1188 1189 ieee80211_sdata_init(local, sdata); 1190 1191 ieee80211_set_default_queues(sdata); 1192 1193 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1194 ret = drv_add_interface(local, sdata); 1195 if (WARN_ON(ret)) { 1196 /* ok .. stupid driver, it asked for this! */ 1197 kfree(sdata); 1198 return ret; 1199 } 1200 } 1201 1202 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1203 1204 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1205 if (ret) { 1206 kfree(sdata); 1207 return ret; 1208 } 1209 1210 mutex_lock(&local->iflist_mtx); 1211 rcu_assign_pointer(local->monitor_sdata, sdata); 1212 mutex_unlock(&local->iflist_mtx); 1213 1214 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1215 IEEE80211_CHANCTX_EXCLUSIVE); 1216 if (ret) { 1217 mutex_lock(&local->iflist_mtx); 1218 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1219 mutex_unlock(&local->iflist_mtx); 1220 synchronize_net(); 1221 drv_remove_interface(local, sdata); 1222 kfree(sdata); 1223 return ret; 1224 } 1225 1226 skb_queue_head_init(&sdata->skb_queue); 1227 skb_queue_head_init(&sdata->status_queue); 1228 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1229 1230 return 0; 1231 } 1232 1233 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1234 { 1235 struct ieee80211_sub_if_data *sdata; 1236 1237 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1238 return; 1239 1240 ASSERT_RTNL(); 1241 lockdep_assert_wiphy(local->hw.wiphy); 1242 1243 mutex_lock(&local->iflist_mtx); 1244 1245 sdata = rcu_dereference_protected(local->monitor_sdata, 1246 lockdep_is_held(&local->iflist_mtx)); 1247 if (!sdata) { 1248 mutex_unlock(&local->iflist_mtx); 1249 return; 1250 } 1251 1252 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1253 ieee80211_link_release_channel(&sdata->deflink); 1254 1255 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1256 drv_remove_interface(local, sdata); 1257 1258 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1259 mutex_unlock(&local->iflist_mtx); 1260 1261 synchronize_net(); 1262 1263 kfree(sdata); 1264 } 1265 1266 /* 1267 * NOTE: Be very careful when changing this function, it must NOT return 1268 * an error on interface type changes that have been pre-checked, so most 1269 * checks should be in ieee80211_check_concurrent_iface. 1270 */ 1271 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1272 { 1273 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1274 struct net_device *dev = wdev->netdev; 1275 struct ieee80211_local *local = sdata->local; 1276 u64 changed = 0; 1277 int res; 1278 u32 hw_reconf_flags = 0; 1279 1280 lockdep_assert_wiphy(local->hw.wiphy); 1281 1282 switch (sdata->vif.type) { 1283 case NL80211_IFTYPE_AP_VLAN: { 1284 struct ieee80211_sub_if_data *master; 1285 1286 if (!sdata->bss) 1287 return -ENOLINK; 1288 1289 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1290 1291 master = container_of(sdata->bss, 1292 struct ieee80211_sub_if_data, u.ap); 1293 sdata->control_port_protocol = 1294 master->control_port_protocol; 1295 sdata->control_port_no_encrypt = 1296 master->control_port_no_encrypt; 1297 sdata->control_port_over_nl80211 = 1298 master->control_port_over_nl80211; 1299 sdata->control_port_no_preauth = 1300 master->control_port_no_preauth; 1301 sdata->vif.cab_queue = master->vif.cab_queue; 1302 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1303 sizeof(sdata->vif.hw_queue)); 1304 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1305 1306 sdata->crypto_tx_tailroom_needed_cnt += 1307 master->crypto_tx_tailroom_needed_cnt; 1308 1309 ieee80211_apvlan_link_setup(sdata); 1310 1311 break; 1312 } 1313 case NL80211_IFTYPE_AP: 1314 sdata->bss = &sdata->u.ap; 1315 break; 1316 case NL80211_IFTYPE_MESH_POINT: 1317 case NL80211_IFTYPE_STATION: 1318 case NL80211_IFTYPE_MONITOR: 1319 case NL80211_IFTYPE_ADHOC: 1320 case NL80211_IFTYPE_P2P_DEVICE: 1321 case NL80211_IFTYPE_OCB: 1322 case NL80211_IFTYPE_NAN: 1323 /* no special treatment */ 1324 break; 1325 case NL80211_IFTYPE_UNSPECIFIED: 1326 case NUM_NL80211_IFTYPES: 1327 case NL80211_IFTYPE_P2P_CLIENT: 1328 case NL80211_IFTYPE_P2P_GO: 1329 case NL80211_IFTYPE_WDS: 1330 /* cannot happen */ 1331 WARN_ON(1); 1332 break; 1333 } 1334 1335 if (local->open_count == 0) { 1336 /* here we can consider everything in good order (again) */ 1337 local->reconfig_failure = false; 1338 1339 res = drv_start(local); 1340 if (res) 1341 goto err_del_bss; 1342 ieee80211_led_radio(local, true); 1343 ieee80211_mod_tpt_led_trig(local, 1344 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1345 } 1346 1347 /* 1348 * Copy the hopefully now-present MAC address to 1349 * this interface, if it has the special null one. 1350 */ 1351 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1352 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1353 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1354 1355 if (!is_valid_ether_addr(dev->dev_addr)) { 1356 res = -EADDRNOTAVAIL; 1357 goto err_stop; 1358 } 1359 } 1360 1361 sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR || 1362 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE); 1363 switch (sdata->vif.type) { 1364 case NL80211_IFTYPE_AP_VLAN: 1365 /* no need to tell driver, but set carrier and chanctx */ 1366 if (sdata->bss->active) { 1367 struct ieee80211_link_data *link; 1368 1369 for_each_link_data(sdata, link) { 1370 ieee80211_link_vlan_copy_chanctx(link); 1371 } 1372 1373 netif_carrier_on(dev); 1374 ieee80211_set_vif_encap_ops(sdata); 1375 } else { 1376 netif_carrier_off(dev); 1377 } 1378 break; 1379 case NL80211_IFTYPE_MONITOR: 1380 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1381 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1382 res = drv_add_interface(local, sdata); 1383 if (res) 1384 goto err_stop; 1385 } else { 1386 if (local->virt_monitors == 0 && local->open_count == 0) { 1387 res = ieee80211_add_virtual_monitor(local); 1388 if (res) 1389 goto err_stop; 1390 } 1391 local->virt_monitors++; 1392 1393 /* must be before the call to ieee80211_configure_filter */ 1394 if (local->virt_monitors == 1) { 1395 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1396 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1397 } 1398 } 1399 1400 local->monitors++; 1401 1402 ieee80211_adjust_monitor_flags(sdata, 1); 1403 ieee80211_configure_filter(local); 1404 ieee80211_recalc_offload(local); 1405 ieee80211_recalc_idle(local); 1406 1407 netif_carrier_on(dev); 1408 break; 1409 default: 1410 if (coming_up) { 1411 ieee80211_del_virtual_monitor(local); 1412 ieee80211_set_sdata_offload_flags(sdata); 1413 1414 res = drv_add_interface(local, sdata); 1415 if (res) 1416 goto err_stop; 1417 1418 ieee80211_set_vif_encap_ops(sdata); 1419 res = ieee80211_check_queues(sdata, 1420 ieee80211_vif_type_p2p(&sdata->vif)); 1421 if (res) 1422 goto err_del_interface; 1423 } 1424 1425 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1426 local->fif_pspoll++; 1427 local->fif_probe_req++; 1428 1429 ieee80211_configure_filter(local); 1430 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1431 local->fif_probe_req++; 1432 } 1433 1434 if (sdata->vif.probe_req_reg) 1435 drv_config_iface_filter(local, sdata, 1436 FIF_PROBE_REQ, 1437 FIF_PROBE_REQ); 1438 1439 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1440 sdata->vif.type != NL80211_IFTYPE_NAN) 1441 changed |= ieee80211_reset_erp_info(sdata); 1442 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1443 changed); 1444 1445 switch (sdata->vif.type) { 1446 case NL80211_IFTYPE_STATION: 1447 case NL80211_IFTYPE_ADHOC: 1448 case NL80211_IFTYPE_AP: 1449 case NL80211_IFTYPE_MESH_POINT: 1450 case NL80211_IFTYPE_OCB: 1451 netif_carrier_off(dev); 1452 break; 1453 case NL80211_IFTYPE_P2P_DEVICE: 1454 case NL80211_IFTYPE_NAN: 1455 break; 1456 default: 1457 /* not reached */ 1458 WARN_ON(1); 1459 } 1460 1461 /* 1462 * Set default queue parameters so drivers don't 1463 * need to initialise the hardware if the hardware 1464 * doesn't start up with sane defaults. 1465 * Enable QoS for anything but station interfaces. 1466 */ 1467 ieee80211_set_wmm_default(&sdata->deflink, true, 1468 sdata->vif.type != NL80211_IFTYPE_STATION); 1469 } 1470 1471 switch (sdata->vif.type) { 1472 case NL80211_IFTYPE_P2P_DEVICE: 1473 rcu_assign_pointer(local->p2p_sdata, sdata); 1474 break; 1475 case NL80211_IFTYPE_MONITOR: 1476 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1477 break; 1478 default: 1479 break; 1480 } 1481 1482 /* 1483 * set_multicast_list will be invoked by the networking core 1484 * which will check whether any increments here were done in 1485 * error and sync them down to the hardware as filter flags. 1486 */ 1487 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1488 atomic_inc(&local->iff_allmultis); 1489 1490 if (coming_up) 1491 local->open_count++; 1492 1493 if (local->open_count == 1) 1494 ieee80211_hw_conf_init(local); 1495 else if (hw_reconf_flags) 1496 ieee80211_hw_config(local, -1, hw_reconf_flags); 1497 1498 ieee80211_recalc_ps(local); 1499 1500 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1501 1502 return 0; 1503 err_del_interface: 1504 drv_remove_interface(local, sdata); 1505 err_stop: 1506 if (!local->open_count) 1507 drv_stop(local, false); 1508 err_del_bss: 1509 sdata->bss = NULL; 1510 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1511 list_del(&sdata->u.vlan.list); 1512 /* might already be clear but that doesn't matter */ 1513 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1514 return res; 1515 } 1516 1517 static void ieee80211_if_setup(struct net_device *dev) 1518 { 1519 ether_setup(dev); 1520 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1521 dev->priv_flags |= IFF_NO_QUEUE; 1522 dev->netdev_ops = &ieee80211_dataif_ops; 1523 dev->needs_free_netdev = true; 1524 } 1525 1526 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1527 struct ieee80211_sub_if_data *sdata, 1528 struct sk_buff *skb) 1529 { 1530 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1531 1532 lockdep_assert_wiphy(local->hw.wiphy); 1533 1534 if (ieee80211_is_action(mgmt->frame_control) && 1535 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1536 struct sta_info *sta; 1537 int len = skb->len; 1538 1539 sta = sta_info_get_bss(sdata, mgmt->sa); 1540 if (sta) { 1541 switch (mgmt->u.action.u.addba_req.action_code) { 1542 case WLAN_ACTION_ADDBA_REQ: 1543 ieee80211_process_addba_request(local, sta, 1544 mgmt, len); 1545 break; 1546 case WLAN_ACTION_ADDBA_RESP: 1547 ieee80211_process_addba_resp(local, sta, 1548 mgmt, len); 1549 break; 1550 case WLAN_ACTION_DELBA: 1551 ieee80211_process_delba(sdata, sta, 1552 mgmt, len); 1553 break; 1554 default: 1555 WARN_ON(1); 1556 break; 1557 } 1558 } 1559 } else if (ieee80211_is_action(mgmt->frame_control) && 1560 mgmt->u.action.category == WLAN_CATEGORY_HT) { 1561 switch (mgmt->u.action.u.ht_smps.action) { 1562 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { 1563 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; 1564 struct ieee80211_rx_status *status; 1565 struct link_sta_info *link_sta; 1566 struct sta_info *sta; 1567 1568 sta = sta_info_get_bss(sdata, mgmt->sa); 1569 if (!sta) 1570 break; 1571 1572 status = IEEE80211_SKB_RXCB(skb); 1573 if (!status->link_valid) 1574 link_sta = &sta->deflink; 1575 else 1576 link_sta = rcu_dereference_protected(sta->link[status->link_id], 1577 lockdep_is_held(&local->hw.wiphy->mtx)); 1578 if (link_sta) 1579 ieee80211_ht_handle_chanwidth_notif(local, sdata, sta, 1580 link_sta, chanwidth, 1581 status->band); 1582 break; 1583 } 1584 default: 1585 WARN_ON(1); 1586 break; 1587 } 1588 } else if (ieee80211_is_action(mgmt->frame_control) && 1589 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1590 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1591 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1592 struct ieee80211_rx_status *status; 1593 enum nl80211_band band; 1594 struct sta_info *sta; 1595 u8 opmode; 1596 1597 status = IEEE80211_SKB_RXCB(skb); 1598 band = status->band; 1599 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1600 1601 sta = sta_info_get_bss(sdata, mgmt->sa); 1602 1603 if (sta) 1604 ieee80211_vht_handle_opmode(sdata, 1605 &sta->deflink, 1606 opmode, band); 1607 1608 break; 1609 } 1610 case WLAN_VHT_ACTION_GROUPID_MGMT: 1611 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1612 mgmt); 1613 break; 1614 default: 1615 WARN_ON(1); 1616 break; 1617 } 1618 } else if (ieee80211_is_action(mgmt->frame_control) && 1619 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1620 switch (mgmt->u.action.u.s1g.action_code) { 1621 case WLAN_S1G_TWT_TEARDOWN: 1622 case WLAN_S1G_TWT_SETUP: 1623 ieee80211_s1g_rx_twt_action(sdata, skb); 1624 break; 1625 default: 1626 break; 1627 } 1628 } else if (ieee80211_is_action(mgmt->frame_control) && 1629 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1630 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1631 switch (mgmt->u.action.u.ttlm_req.action_code) { 1632 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1633 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1634 skb->len); 1635 break; 1636 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1637 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1638 skb->len); 1639 break; 1640 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 1641 ieee80211_process_ttlm_teardown(sdata); 1642 break; 1643 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 1644 ieee80211_process_ml_reconf_resp(sdata, mgmt, 1645 skb->len); 1646 break; 1647 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 1648 ieee80211_process_epcs_ena_resp(sdata, mgmt, 1649 skb->len); 1650 break; 1651 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 1652 ieee80211_process_epcs_teardown(sdata, mgmt, 1653 skb->len); 1654 break; 1655 default: 1656 break; 1657 } 1658 } 1659 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1660 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1661 ieee80211_sta_rx_queued_ext(sdata, skb); 1662 else 1663 WARN_ON(1); 1664 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1665 struct ieee80211_hdr *hdr = (void *)mgmt; 1666 struct sta_info *sta; 1667 1668 /* 1669 * So the frame isn't mgmt, but frame_control 1670 * is at the right place anyway, of course, so 1671 * the if statement is correct. 1672 * 1673 * Warn if we have other data frame types here, 1674 * they must not get here. 1675 */ 1676 WARN_ON(hdr->frame_control & 1677 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1678 WARN_ON(!(hdr->seq_ctrl & 1679 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1680 /* 1681 * This was a fragment of a frame, received while 1682 * a block-ack session was active. That cannot be 1683 * right, so terminate the session. 1684 */ 1685 sta = sta_info_get_bss(sdata, mgmt->sa); 1686 if (sta) { 1687 u16 tid = ieee80211_get_tid(hdr); 1688 1689 __ieee80211_stop_rx_ba_session( 1690 sta, tid, WLAN_BACK_RECIPIENT, 1691 WLAN_REASON_QSTA_REQUIRE_SETUP, 1692 true); 1693 } 1694 } else switch (sdata->vif.type) { 1695 case NL80211_IFTYPE_STATION: 1696 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1697 break; 1698 case NL80211_IFTYPE_ADHOC: 1699 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1700 break; 1701 case NL80211_IFTYPE_MESH_POINT: 1702 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1703 break; 1704 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1705 break; 1706 default: 1707 WARN(1, "frame for unexpected interface type"); 1708 break; 1709 } 1710 } 1711 1712 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1713 struct sk_buff *skb) 1714 { 1715 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1716 1717 if (ieee80211_is_action(mgmt->frame_control) && 1718 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1719 switch (mgmt->u.action.u.s1g.action_code) { 1720 case WLAN_S1G_TWT_TEARDOWN: 1721 case WLAN_S1G_TWT_SETUP: 1722 ieee80211_s1g_status_twt_action(sdata, skb); 1723 break; 1724 default: 1725 break; 1726 } 1727 } 1728 } 1729 1730 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1731 { 1732 struct ieee80211_sub_if_data *sdata = 1733 container_of(work, struct ieee80211_sub_if_data, work); 1734 struct ieee80211_local *local = sdata->local; 1735 struct sk_buff *skb; 1736 1737 if (!ieee80211_sdata_running(sdata)) 1738 return; 1739 1740 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1741 return; 1742 1743 if (!ieee80211_can_run_worker(local)) 1744 return; 1745 1746 /* first process frames */ 1747 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1748 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1749 1750 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1751 ieee80211_process_tdls_channel_switch(sdata, skb); 1752 else 1753 ieee80211_iface_process_skb(local, sdata, skb); 1754 1755 kfree_skb(skb); 1756 kcov_remote_stop(); 1757 } 1758 1759 /* process status queue */ 1760 while ((skb = skb_dequeue(&sdata->status_queue))) { 1761 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1762 1763 ieee80211_iface_process_status(sdata, skb); 1764 kfree_skb(skb); 1765 1766 kcov_remote_stop(); 1767 } 1768 1769 /* then other type-dependent work */ 1770 switch (sdata->vif.type) { 1771 case NL80211_IFTYPE_STATION: 1772 ieee80211_sta_work(sdata); 1773 break; 1774 case NL80211_IFTYPE_ADHOC: 1775 ieee80211_ibss_work(sdata); 1776 break; 1777 case NL80211_IFTYPE_MESH_POINT: 1778 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1779 break; 1780 ieee80211_mesh_work(sdata); 1781 break; 1782 case NL80211_IFTYPE_OCB: 1783 ieee80211_ocb_work(sdata); 1784 break; 1785 default: 1786 break; 1787 } 1788 } 1789 1790 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1791 struct wiphy_work *work) 1792 { 1793 struct ieee80211_sub_if_data *sdata = 1794 container_of(work, struct ieee80211_sub_if_data, 1795 activate_links_work); 1796 struct ieee80211_local *local = wiphy_priv(wiphy); 1797 1798 if (local->in_reconfig) 1799 return; 1800 1801 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1802 sdata->desired_active_links = 0; 1803 } 1804 1805 /* 1806 * Helper function to initialise an interface to a specific type. 1807 */ 1808 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1809 enum nl80211_iftype type) 1810 { 1811 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1812 0xff, 0xff, 0xff}; 1813 1814 /* clear type-dependent unions */ 1815 memset(&sdata->u, 0, sizeof(sdata->u)); 1816 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1817 1818 /* and set some type-dependent values */ 1819 sdata->vif.type = type; 1820 sdata->vif.p2p = false; 1821 sdata->wdev.iftype = type; 1822 1823 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1824 sdata->control_port_no_encrypt = false; 1825 sdata->control_port_over_nl80211 = false; 1826 sdata->control_port_no_preauth = false; 1827 sdata->vif.cfg.idle = true; 1828 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1829 1830 sdata->noack_map = 0; 1831 1832 /* only monitor/p2p-device differ */ 1833 if (sdata->dev) { 1834 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1835 sdata->dev->type = ARPHRD_ETHER; 1836 } 1837 1838 skb_queue_head_init(&sdata->skb_queue); 1839 skb_queue_head_init(&sdata->status_queue); 1840 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1841 wiphy_work_init(&sdata->activate_links_work, 1842 ieee80211_activate_links_work); 1843 1844 switch (type) { 1845 case NL80211_IFTYPE_P2P_GO: 1846 type = NL80211_IFTYPE_AP; 1847 sdata->vif.type = type; 1848 sdata->vif.p2p = true; 1849 fallthrough; 1850 case NL80211_IFTYPE_AP: 1851 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1852 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1853 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1854 break; 1855 case NL80211_IFTYPE_P2P_CLIENT: 1856 type = NL80211_IFTYPE_STATION; 1857 sdata->vif.type = type; 1858 sdata->vif.p2p = true; 1859 fallthrough; 1860 case NL80211_IFTYPE_STATION: 1861 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1862 ieee80211_sta_setup_sdata(sdata); 1863 break; 1864 case NL80211_IFTYPE_OCB: 1865 sdata->vif.bss_conf.bssid = bssid_wildcard; 1866 ieee80211_ocb_setup_sdata(sdata); 1867 break; 1868 case NL80211_IFTYPE_ADHOC: 1869 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1870 ieee80211_ibss_setup_sdata(sdata); 1871 break; 1872 case NL80211_IFTYPE_MESH_POINT: 1873 if (ieee80211_vif_is_mesh(&sdata->vif)) 1874 ieee80211_mesh_init_sdata(sdata); 1875 break; 1876 case NL80211_IFTYPE_MONITOR: 1877 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1878 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1879 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1880 MONITOR_FLAG_OTHER_BSS; 1881 break; 1882 case NL80211_IFTYPE_NAN: 1883 idr_init(&sdata->u.nan.function_inst_ids); 1884 spin_lock_init(&sdata->u.nan.func_lock); 1885 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1886 break; 1887 case NL80211_IFTYPE_AP_VLAN: 1888 case NL80211_IFTYPE_P2P_DEVICE: 1889 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1890 break; 1891 case NL80211_IFTYPE_UNSPECIFIED: 1892 case NL80211_IFTYPE_WDS: 1893 case NUM_NL80211_IFTYPES: 1894 WARN_ON(1); 1895 break; 1896 } 1897 1898 /* need to do this after the switch so vif.type is correct */ 1899 ieee80211_link_setup(&sdata->deflink); 1900 1901 ieee80211_debugfs_recreate_netdev(sdata, false); 1902 } 1903 1904 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1905 enum nl80211_iftype type) 1906 { 1907 struct ieee80211_local *local = sdata->local; 1908 int ret, err; 1909 enum nl80211_iftype internal_type = type; 1910 bool p2p = false; 1911 1912 ASSERT_RTNL(); 1913 1914 if (!local->ops->change_interface) 1915 return -EBUSY; 1916 1917 /* for now, don't support changing while links exist */ 1918 if (ieee80211_vif_is_mld(&sdata->vif)) 1919 return -EBUSY; 1920 1921 switch (sdata->vif.type) { 1922 case NL80211_IFTYPE_AP: 1923 if (!list_empty(&sdata->u.ap.vlans)) 1924 return -EBUSY; 1925 break; 1926 case NL80211_IFTYPE_STATION: 1927 case NL80211_IFTYPE_ADHOC: 1928 case NL80211_IFTYPE_OCB: 1929 /* 1930 * Could maybe also all others here? 1931 * Just not sure how that interacts 1932 * with the RX/config path e.g. for 1933 * mesh. 1934 */ 1935 break; 1936 default: 1937 return -EBUSY; 1938 } 1939 1940 switch (type) { 1941 case NL80211_IFTYPE_AP: 1942 case NL80211_IFTYPE_STATION: 1943 case NL80211_IFTYPE_ADHOC: 1944 case NL80211_IFTYPE_OCB: 1945 /* 1946 * Could probably support everything 1947 * but here. 1948 */ 1949 break; 1950 case NL80211_IFTYPE_P2P_CLIENT: 1951 p2p = true; 1952 internal_type = NL80211_IFTYPE_STATION; 1953 break; 1954 case NL80211_IFTYPE_P2P_GO: 1955 p2p = true; 1956 internal_type = NL80211_IFTYPE_AP; 1957 break; 1958 default: 1959 return -EBUSY; 1960 } 1961 1962 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1963 if (ret) 1964 return ret; 1965 1966 ieee80211_stop_vif_queues(local, sdata, 1967 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1968 /* do_stop will synchronize_rcu() first thing */ 1969 ieee80211_do_stop(sdata, false); 1970 1971 ieee80211_teardown_sdata(sdata); 1972 1973 ieee80211_set_sdata_offload_flags(sdata); 1974 ret = drv_change_interface(local, sdata, internal_type, p2p); 1975 if (ret) 1976 type = ieee80211_vif_type_p2p(&sdata->vif); 1977 1978 /* 1979 * Ignore return value here, there's not much we can do since 1980 * the driver changed the interface type internally already. 1981 * The warnings will hopefully make driver authors fix it :-) 1982 */ 1983 ieee80211_check_queues(sdata, type); 1984 1985 ieee80211_setup_sdata(sdata, type); 1986 ieee80211_set_vif_encap_ops(sdata); 1987 1988 err = ieee80211_do_open(&sdata->wdev, false); 1989 WARN(err, "type change: do_open returned %d", err); 1990 1991 ieee80211_wake_vif_queues(local, sdata, 1992 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1993 return ret; 1994 } 1995 1996 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1997 enum nl80211_iftype type) 1998 { 1999 int ret; 2000 2001 ASSERT_RTNL(); 2002 2003 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 2004 return 0; 2005 2006 if (ieee80211_sdata_running(sdata)) { 2007 ret = ieee80211_runtime_change_iftype(sdata, type); 2008 if (ret) 2009 return ret; 2010 } else { 2011 /* Purge and reset type-dependent state. */ 2012 ieee80211_teardown_sdata(sdata); 2013 ieee80211_setup_sdata(sdata, type); 2014 } 2015 2016 /* reset some values that shouldn't be kept across type changes */ 2017 if (type == NL80211_IFTYPE_STATION) 2018 sdata->u.mgd.use_4addr = false; 2019 2020 return 0; 2021 } 2022 2023 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 2024 u8 *perm_addr, enum nl80211_iftype type) 2025 { 2026 struct ieee80211_sub_if_data *sdata; 2027 u64 mask, start, addr, val, inc; 2028 u8 *m; 2029 u8 tmp_addr[ETH_ALEN]; 2030 int i; 2031 2032 lockdep_assert_wiphy(local->hw.wiphy); 2033 2034 /* default ... something at least */ 2035 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 2036 2037 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 2038 local->hw.wiphy->n_addresses <= 1) 2039 return; 2040 2041 switch (type) { 2042 case NL80211_IFTYPE_MONITOR: 2043 /* doesn't matter */ 2044 break; 2045 case NL80211_IFTYPE_AP_VLAN: 2046 /* match up with an AP interface */ 2047 list_for_each_entry(sdata, &local->interfaces, list) { 2048 if (sdata->vif.type != NL80211_IFTYPE_AP) 2049 continue; 2050 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 2051 break; 2052 } 2053 /* keep default if no AP interface present */ 2054 break; 2055 case NL80211_IFTYPE_P2P_CLIENT: 2056 case NL80211_IFTYPE_P2P_GO: 2057 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 2058 list_for_each_entry(sdata, &local->interfaces, list) { 2059 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 2060 continue; 2061 if (!ieee80211_sdata_running(sdata)) 2062 continue; 2063 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 2064 return; 2065 } 2066 } 2067 fallthrough; 2068 default: 2069 /* assign a new address if possible -- try n_addresses first */ 2070 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 2071 bool used = false; 2072 2073 list_for_each_entry(sdata, &local->interfaces, list) { 2074 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 2075 sdata->vif.addr)) { 2076 used = true; 2077 break; 2078 } 2079 } 2080 2081 if (!used) { 2082 memcpy(perm_addr, 2083 local->hw.wiphy->addresses[i].addr, 2084 ETH_ALEN); 2085 break; 2086 } 2087 } 2088 2089 /* try mask if available */ 2090 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 2091 break; 2092 2093 m = local->hw.wiphy->addr_mask; 2094 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2095 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2096 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2097 2098 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2099 /* not a contiguous mask ... not handled now! */ 2100 pr_info("not contiguous\n"); 2101 break; 2102 } 2103 2104 /* 2105 * Pick address of existing interface in case user changed 2106 * MAC address manually, default to perm_addr. 2107 */ 2108 m = local->hw.wiphy->perm_addr; 2109 list_for_each_entry(sdata, &local->interfaces, list) { 2110 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2111 continue; 2112 m = sdata->vif.addr; 2113 break; 2114 } 2115 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2116 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2117 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2118 2119 inc = 1ULL<<__ffs64(mask); 2120 val = (start & mask); 2121 addr = (start & ~mask) | (val & mask); 2122 do { 2123 bool used = false; 2124 2125 tmp_addr[5] = addr >> 0*8; 2126 tmp_addr[4] = addr >> 1*8; 2127 tmp_addr[3] = addr >> 2*8; 2128 tmp_addr[2] = addr >> 3*8; 2129 tmp_addr[1] = addr >> 4*8; 2130 tmp_addr[0] = addr >> 5*8; 2131 2132 val += inc; 2133 2134 list_for_each_entry(sdata, &local->interfaces, list) { 2135 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2136 used = true; 2137 break; 2138 } 2139 } 2140 2141 if (!used) { 2142 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2143 break; 2144 } 2145 addr = (start & ~mask) | (val & mask); 2146 } while (addr != start); 2147 2148 break; 2149 } 2150 } 2151 2152 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2153 unsigned char name_assign_type, 2154 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2155 struct vif_params *params) 2156 { 2157 struct net_device *ndev = NULL; 2158 struct ieee80211_sub_if_data *sdata = NULL; 2159 struct txq_info *txqi; 2160 int ret, i; 2161 2162 ASSERT_RTNL(); 2163 lockdep_assert_wiphy(local->hw.wiphy); 2164 2165 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2166 struct wireless_dev *wdev; 2167 2168 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2169 GFP_KERNEL); 2170 if (!sdata) 2171 return -ENOMEM; 2172 wdev = &sdata->wdev; 2173 2174 sdata->dev = NULL; 2175 strscpy(sdata->name, name, IFNAMSIZ); 2176 ieee80211_assign_perm_addr(local, wdev->address, type); 2177 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2178 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2179 } else { 2180 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2181 sizeof(void *)); 2182 int txq_size = 0; 2183 2184 if (type != NL80211_IFTYPE_AP_VLAN && 2185 (type != NL80211_IFTYPE_MONITOR || 2186 (params->flags & MONITOR_FLAG_ACTIVE))) 2187 txq_size += sizeof(struct txq_info) + 2188 local->hw.txq_data_size; 2189 2190 ndev = alloc_netdev_mqs(size + txq_size, 2191 name, name_assign_type, 2192 ieee80211_if_setup, 1, 1); 2193 if (!ndev) 2194 return -ENOMEM; 2195 2196 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2197 2198 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2199 2200 ndev->needed_headroom = local->tx_headroom + 2201 4*6 /* four MAC addresses */ 2202 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2203 + 6 /* mesh */ 2204 + 8 /* rfc1042/bridge tunnel */ 2205 - ETH_HLEN /* ethernet hard_header_len */ 2206 + IEEE80211_ENCRYPT_HEADROOM; 2207 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2208 2209 ret = dev_alloc_name(ndev, ndev->name); 2210 if (ret < 0) { 2211 free_netdev(ndev); 2212 return ret; 2213 } 2214 2215 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2216 if (is_valid_ether_addr(params->macaddr)) 2217 eth_hw_addr_set(ndev, params->macaddr); 2218 else 2219 eth_hw_addr_set(ndev, ndev->perm_addr); 2220 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2221 2222 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2223 sdata = netdev_priv(ndev); 2224 ndev->ieee80211_ptr = &sdata->wdev; 2225 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2226 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2227 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2228 2229 if (txq_size) { 2230 txqi = netdev_priv(ndev) + size; 2231 ieee80211_txq_init(sdata, NULL, txqi, 0); 2232 } 2233 2234 sdata->dev = ndev; 2235 } 2236 2237 /* initialise type-independent data */ 2238 sdata->wdev.wiphy = local->hw.wiphy; 2239 2240 ieee80211_sdata_init(local, sdata); 2241 2242 ieee80211_init_frag_cache(&sdata->frags); 2243 2244 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2245 ieee80211_delayed_tailroom_dec); 2246 2247 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2248 struct ieee80211_supported_band *sband; 2249 sband = local->hw.wiphy->bands[i]; 2250 sdata->rc_rateidx_mask[i] = 2251 sband ? (1 << sband->n_bitrates) - 1 : 0; 2252 if (sband) { 2253 __le16 cap; 2254 u16 *vht_rate_mask; 2255 2256 memcpy(sdata->rc_rateidx_mcs_mask[i], 2257 sband->ht_cap.mcs.rx_mask, 2258 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2259 2260 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2261 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2262 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2263 } else { 2264 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2265 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2266 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2267 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2268 } 2269 } 2270 2271 ieee80211_set_default_queues(sdata); 2272 2273 /* setup type-dependent data */ 2274 ieee80211_setup_sdata(sdata, type); 2275 2276 if (ndev) { 2277 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2278 if (type == NL80211_IFTYPE_STATION) 2279 sdata->u.mgd.use_4addr = params->use_4addr; 2280 2281 ndev->features |= local->hw.netdev_features; 2282 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2283 ndev->hw_features |= ndev->features & 2284 MAC80211_SUPPORTED_FEATURES_TX; 2285 sdata->vif.netdev_features = local->hw.netdev_features; 2286 2287 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2288 2289 /* MTU range is normally 256 - 2304, where the upper limit is 2290 * the maximum MSDU size. Monitor interfaces send and receive 2291 * MPDU and A-MSDU frames which may be much larger so we do 2292 * not impose an upper limit in that case. 2293 */ 2294 ndev->min_mtu = 256; 2295 if (type == NL80211_IFTYPE_MONITOR) 2296 ndev->max_mtu = 0; 2297 else 2298 ndev->max_mtu = local->hw.max_mtu; 2299 2300 ret = cfg80211_register_netdevice(ndev); 2301 if (ret) { 2302 free_netdev(ndev); 2303 return ret; 2304 } 2305 } 2306 2307 mutex_lock(&local->iflist_mtx); 2308 list_add_tail_rcu(&sdata->list, &local->interfaces); 2309 mutex_unlock(&local->iflist_mtx); 2310 2311 if (new_wdev) 2312 *new_wdev = &sdata->wdev; 2313 2314 return 0; 2315 } 2316 2317 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2318 { 2319 ASSERT_RTNL(); 2320 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2321 2322 mutex_lock(&sdata->local->iflist_mtx); 2323 list_del_rcu(&sdata->list); 2324 mutex_unlock(&sdata->local->iflist_mtx); 2325 2326 if (sdata->vif.txq) 2327 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2328 2329 synchronize_rcu(); 2330 2331 cfg80211_unregister_wdev(&sdata->wdev); 2332 2333 if (!sdata->dev) { 2334 ieee80211_teardown_sdata(sdata); 2335 kfree(sdata); 2336 } 2337 } 2338 2339 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2340 { 2341 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2342 return; 2343 ieee80211_do_stop(sdata, true); 2344 } 2345 2346 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2347 { 2348 struct ieee80211_sub_if_data *sdata, *tmp; 2349 LIST_HEAD(unreg_list); 2350 2351 ASSERT_RTNL(); 2352 2353 /* Before destroying the interfaces, make sure they're all stopped so 2354 * that the hardware is stopped. Otherwise, the driver might still be 2355 * iterating the interfaces during the shutdown, e.g. from a worker 2356 * or from RX processing or similar, and if it does so (using atomic 2357 * iteration) while we're manipulating the list, the iteration will 2358 * crash. 2359 * 2360 * After this, the hardware should be stopped and the driver should 2361 * have stopped all of its activities, so that we can do RCU-unaware 2362 * manipulations of the interface list below. 2363 */ 2364 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2365 2366 guard(wiphy)(local->hw.wiphy); 2367 2368 WARN(local->open_count, "%s: open count remains %d\n", 2369 wiphy_name(local->hw.wiphy), local->open_count); 2370 2371 mutex_lock(&local->iflist_mtx); 2372 list_splice_init(&local->interfaces, &unreg_list); 2373 mutex_unlock(&local->iflist_mtx); 2374 2375 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2376 bool netdev = sdata->dev; 2377 2378 /* 2379 * Remove IP addresses explicitly, since the notifier will 2380 * skip the callbacks if wdev->registered is false, since 2381 * we can't acquire the wiphy_lock() again there if already 2382 * inside this locked section. 2383 */ 2384 sdata->vif.cfg.arp_addr_cnt = 0; 2385 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2386 sdata->u.mgd.associated) 2387 ieee80211_vif_cfg_change_notify(sdata, 2388 BSS_CHANGED_ARP_FILTER); 2389 2390 list_del(&sdata->list); 2391 cfg80211_unregister_wdev(&sdata->wdev); 2392 2393 if (!netdev) 2394 kfree(sdata); 2395 } 2396 } 2397 2398 static int netdev_notify(struct notifier_block *nb, 2399 unsigned long state, void *ptr) 2400 { 2401 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2402 struct ieee80211_sub_if_data *sdata; 2403 2404 if (state != NETDEV_CHANGENAME) 2405 return NOTIFY_DONE; 2406 2407 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2408 return NOTIFY_DONE; 2409 2410 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2411 return NOTIFY_DONE; 2412 2413 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2414 memcpy(sdata->name, dev->name, IFNAMSIZ); 2415 ieee80211_debugfs_rename_netdev(sdata); 2416 2417 return NOTIFY_OK; 2418 } 2419 2420 static struct notifier_block mac80211_netdev_notifier = { 2421 .notifier_call = netdev_notify, 2422 }; 2423 2424 int ieee80211_iface_init(void) 2425 { 2426 return register_netdevice_notifier(&mac80211_netdev_notifier); 2427 } 2428 2429 void ieee80211_iface_exit(void) 2430 { 2431 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2432 } 2433 2434 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2435 { 2436 if (sdata->vif.type == NL80211_IFTYPE_AP) 2437 atomic_inc(&sdata->u.ap.num_mcast_sta); 2438 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2439 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2440 } 2441 2442 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2443 { 2444 if (sdata->vif.type == NL80211_IFTYPE_AP) 2445 atomic_dec(&sdata->u.ap.num_mcast_sta); 2446 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2447 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2448 } 2449 2450 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2451 { 2452 struct ieee80211_local *local = sdata->local; 2453 2454 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2455 return; 2456 2457 ieee80211_stop_vif_queues_norefcount(local, sdata, 2458 IEEE80211_QUEUE_STOP_REASON_CSA); 2459 } 2460 2461 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2462 { 2463 struct ieee80211_local *local = sdata->local; 2464 2465 ieee80211_wake_vif_queues_norefcount(local, sdata, 2466 IEEE80211_QUEUE_STOP_REASON_CSA); 2467 } 2468