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, 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 default: 489 break; 490 } 491 492 /* 493 * Remove all stations associated with this interface. 494 * 495 * This must be done before calling ops->remove_interface() 496 * because otherwise we can later invoke ops->sta_notify() 497 * whenever the STAs are removed, and that invalidates driver 498 * assumptions about always getting a vif pointer that is valid 499 * (because if we remove a STA after ops->remove_interface() 500 * the driver will have removed the vif info already!) 501 * 502 * For AP_VLANs stations may exist since there's nothing else that 503 * would have removed them, but in other modes there shouldn't 504 * be any stations. 505 */ 506 flushed = sta_info_flush(sdata, -1); 507 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 508 509 /* don't count this interface for allmulti while it is down */ 510 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 511 atomic_dec(&local->iff_allmultis); 512 513 if (sdata->vif.type == NL80211_IFTYPE_AP) { 514 local->fif_pspoll--; 515 local->fif_probe_req--; 516 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 517 local->fif_probe_req--; 518 } 519 520 if (sdata->dev) { 521 netif_addr_lock_bh(sdata->dev); 522 spin_lock_bh(&local->filter_lock); 523 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 524 sdata->dev->addr_len); 525 spin_unlock_bh(&local->filter_lock); 526 netif_addr_unlock_bh(sdata->dev); 527 } 528 529 timer_delete_sync(&local->dynamic_ps_timer); 530 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 531 532 WARN(ieee80211_vif_is_mld(&sdata->vif), 533 "destroying interface with valid links 0x%04x\n", 534 sdata->vif.valid_links); 535 536 sdata->vif.bss_conf.csa_active = false; 537 if (sdata->vif.type == NL80211_IFTYPE_STATION) 538 sdata->deflink.u.mgd.csa.waiting_bcn = false; 539 ieee80211_vif_unblock_queues_csa(sdata); 540 541 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); 542 wiphy_work_cancel(local->hw.wiphy, 543 &sdata->deflink.color_change_finalize_work); 544 wiphy_delayed_work_cancel(local->hw.wiphy, 545 &sdata->deflink.dfs_cac_timer_work); 546 547 if (sdata->wdev.links[0].cac_started) { 548 chandef = sdata->vif.bss_conf.chanreq.oper; 549 WARN_ON(local->suspended); 550 ieee80211_link_release_channel(&sdata->deflink); 551 cfg80211_cac_event(sdata->dev, &chandef, 552 NL80211_RADAR_CAC_ABORTED, 553 GFP_KERNEL, 0); 554 } 555 556 if (sdata->vif.type == NL80211_IFTYPE_AP) { 557 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 558 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 559 /* remove all packets in parent bc_buf pointing to this dev */ 560 ps = &sdata->bss->ps; 561 562 spin_lock_irqsave(&ps->bc_buf.lock, flags); 563 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 564 if (skb->dev == sdata->dev) { 565 __skb_unlink(skb, &ps->bc_buf); 566 local->total_ps_buffered--; 567 ieee80211_free_txskb(&local->hw, skb); 568 } 569 } 570 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 571 } 572 573 if (going_down) 574 local->open_count--; 575 576 switch (sdata->vif.type) { 577 case NL80211_IFTYPE_AP_VLAN: 578 list_del(&sdata->u.vlan.list); 579 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 580 /* see comment in the default case below */ 581 ieee80211_free_keys(sdata, true); 582 /* no need to tell driver */ 583 break; 584 case NL80211_IFTYPE_MONITOR: 585 local->monitors--; 586 587 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 588 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 589 590 local->virt_monitors--; 591 if (local->virt_monitors == 0) { 592 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 593 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 594 } 595 596 ieee80211_adjust_monitor_flags(sdata, -1); 597 } 598 break; 599 case NL80211_IFTYPE_NAN: 600 /* clean all the functions */ 601 spin_lock_bh(&sdata->u.nan.func_lock); 602 603 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 604 idr_remove(&sdata->u.nan.function_inst_ids, i); 605 cfg80211_free_nan_func(func); 606 } 607 idr_destroy(&sdata->u.nan.function_inst_ids); 608 609 spin_unlock_bh(&sdata->u.nan.func_lock); 610 break; 611 case NL80211_IFTYPE_P2P_DEVICE: 612 /* relies on synchronize_rcu() below */ 613 RCU_INIT_POINTER(local->p2p_sdata, NULL); 614 fallthrough; 615 default: 616 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 617 /* 618 * When we get here, the interface is marked down. 619 * Free the remaining keys, if there are any 620 * (which can happen in AP mode if userspace sets 621 * keys before the interface is operating) 622 * 623 * Force the key freeing to always synchronize_net() 624 * to wait for the RX path in case it is using this 625 * interface enqueuing frames at this very time on 626 * another CPU. 627 */ 628 ieee80211_free_keys(sdata, true); 629 skb_queue_purge(&sdata->skb_queue); 630 skb_queue_purge(&sdata->status_queue); 631 } 632 633 /* 634 * Since ieee80211_free_txskb() may issue __dev_queue_xmit() 635 * which should be called with interrupts enabled, reclamation 636 * is done in two phases: 637 */ 638 __skb_queue_head_init(&freeq); 639 640 /* unlink from local queues... */ 641 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 642 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 643 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 644 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 645 if (info->control.vif == &sdata->vif) { 646 __skb_unlink(skb, &local->pending[i]); 647 __skb_queue_tail(&freeq, skb); 648 } 649 } 650 } 651 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 652 653 /* ... and perform actual reclamation with interrupts enabled. */ 654 skb_queue_walk_safe(&freeq, skb, tmp) { 655 __skb_unlink(skb, &freeq); 656 ieee80211_free_txskb(&local->hw, skb); 657 } 658 659 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 660 ieee80211_txq_remove_vlan(local, sdata); 661 662 if (sdata->vif.txq) 663 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 664 665 sdata->bss = NULL; 666 667 if (local->open_count == 0) 668 ieee80211_clear_tx_pending(local); 669 670 sdata->vif.bss_conf.beacon_int = 0; 671 672 /* 673 * If the interface goes down while suspended, presumably because 674 * the device was unplugged and that happens before our resume, 675 * then the driver is already unconfigured and the remainder of 676 * this function isn't needed. 677 * XXX: what about WoWLAN? If the device has software state, e.g. 678 * memory allocated, it might expect teardown commands from 679 * mac80211 here? 680 */ 681 if (local->suspended) { 682 WARN_ON(local->wowlan); 683 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 684 return; 685 } 686 687 switch (sdata->vif.type) { 688 case NL80211_IFTYPE_AP_VLAN: 689 break; 690 case NL80211_IFTYPE_MONITOR: 691 if (local->virt_monitors == 0) 692 ieee80211_del_virtual_monitor(local); 693 694 ieee80211_recalc_idle(local); 695 ieee80211_recalc_offload(local); 696 697 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 698 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 699 break; 700 701 ieee80211_link_release_channel(&sdata->deflink); 702 fallthrough; 703 default: 704 if (!going_down) 705 break; 706 drv_remove_interface(local, sdata); 707 708 /* Clear private driver data to prevent reuse */ 709 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); 710 } 711 712 ieee80211_recalc_ps(local); 713 714 if (cancel_scan) 715 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 716 717 if (local->open_count == 0) { 718 ieee80211_stop_device(local, false); 719 720 /* no reconfiguring after stop! */ 721 return; 722 } 723 724 /* do after stop to avoid reconfiguring when we stop anyway */ 725 ieee80211_configure_filter(local); 726 ieee80211_hw_config(local, hw_reconf_flags); 727 728 if (local->virt_monitors == local->open_count) 729 ieee80211_add_virtual_monitor(local); 730 } 731 732 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 733 { 734 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 735 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 736 737 if (!tx_vif) 738 return; 739 740 tx_sdata = vif_to_sdata(tx_vif); 741 sdata->vif.mbssid_tx_vif = NULL; 742 743 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 744 &tx_sdata->local->interfaces, list) { 745 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 746 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 747 ieee80211_sdata_running(non_tx_sdata)) { 748 non_tx_sdata->vif.mbssid_tx_vif = NULL; 749 dev_close(non_tx_sdata->wdev.netdev); 750 } 751 } 752 753 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 754 tx_sdata->vif.mbssid_tx_vif = NULL; 755 dev_close(tx_sdata->wdev.netdev); 756 } 757 } 758 759 static int ieee80211_stop(struct net_device *dev) 760 { 761 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 762 763 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 764 if (sdata->vif.type == NL80211_IFTYPE_AP) { 765 struct ieee80211_sub_if_data *vlan, *tmpsdata; 766 767 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 768 u.vlan.list) 769 dev_close(vlan->dev); 770 771 ieee80211_stop_mbssid(sdata); 772 } 773 774 guard(wiphy)(sdata->local->hw.wiphy); 775 776 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 777 778 ieee80211_do_stop(sdata, true); 779 780 return 0; 781 } 782 783 static void ieee80211_set_multicast_list(struct net_device *dev) 784 { 785 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 786 struct ieee80211_local *local = sdata->local; 787 int allmulti, sdata_allmulti; 788 789 allmulti = !!(dev->flags & IFF_ALLMULTI); 790 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 791 792 if (allmulti != sdata_allmulti) { 793 if (dev->flags & IFF_ALLMULTI) 794 atomic_inc(&local->iff_allmultis); 795 else 796 atomic_dec(&local->iff_allmultis); 797 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 798 } 799 800 spin_lock_bh(&local->filter_lock); 801 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 802 spin_unlock_bh(&local->filter_lock); 803 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 804 } 805 806 /* 807 * Called when the netdev is removed or, by the code below, before 808 * the interface type changes. 809 */ 810 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 811 { 812 if (WARN_ON(!list_empty(&sdata->work.entry))) 813 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 814 815 /* free extra data */ 816 ieee80211_free_keys(sdata, false); 817 818 ieee80211_debugfs_remove_netdev(sdata); 819 820 ieee80211_destroy_frag_cache(&sdata->frags); 821 822 if (ieee80211_vif_is_mesh(&sdata->vif)) 823 ieee80211_mesh_teardown_sdata(sdata); 824 825 ieee80211_vif_clear_links(sdata); 826 ieee80211_link_stop(&sdata->deflink); 827 } 828 829 static void ieee80211_uninit(struct net_device *dev) 830 { 831 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 832 } 833 834 static int ieee80211_netdev_setup_tc(struct net_device *dev, 835 enum tc_setup_type type, void *type_data) 836 { 837 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 838 struct ieee80211_local *local = sdata->local; 839 840 return drv_net_setup_tc(local, sdata, dev, type, type_data); 841 } 842 843 static const struct net_device_ops ieee80211_dataif_ops = { 844 .ndo_open = ieee80211_open, 845 .ndo_stop = ieee80211_stop, 846 .ndo_uninit = ieee80211_uninit, 847 .ndo_start_xmit = ieee80211_subif_start_xmit, 848 .ndo_set_rx_mode = ieee80211_set_multicast_list, 849 .ndo_set_mac_address = ieee80211_change_mac, 850 .ndo_setup_tc = ieee80211_netdev_setup_tc, 851 }; 852 853 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 854 struct sk_buff *skb, 855 struct net_device *sb_dev) 856 { 857 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 858 struct ieee80211_local *local = sdata->local; 859 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 860 struct ieee80211_hdr *hdr; 861 int len_rthdr; 862 863 if (local->hw.queues < IEEE80211_NUM_ACS) 864 return 0; 865 866 /* reset flags and info before parsing radiotap header */ 867 memset(info, 0, sizeof(*info)); 868 869 if (!ieee80211_parse_tx_radiotap(skb, dev)) 870 return 0; /* doesn't matter, frame will be dropped */ 871 872 len_rthdr = ieee80211_get_radiotap_len(skb->data); 873 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 874 if (skb->len < len_rthdr + 2 || 875 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 876 return 0; /* doesn't matter, frame will be dropped */ 877 878 return ieee80211_select_queue_80211(sdata, skb, hdr); 879 } 880 881 static const struct net_device_ops ieee80211_monitorif_ops = { 882 .ndo_open = ieee80211_open, 883 .ndo_stop = ieee80211_stop, 884 .ndo_uninit = ieee80211_uninit, 885 .ndo_start_xmit = ieee80211_monitor_start_xmit, 886 .ndo_set_rx_mode = ieee80211_set_multicast_list, 887 .ndo_set_mac_address = ieee80211_change_mac, 888 .ndo_select_queue = ieee80211_monitor_select_queue, 889 }; 890 891 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 892 struct net_device_path *path) 893 { 894 struct ieee80211_sub_if_data *sdata; 895 struct ieee80211_local *local; 896 struct sta_info *sta; 897 int ret = -ENOENT; 898 899 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 900 local = sdata->local; 901 902 if (!local->ops->net_fill_forward_path) 903 return -EOPNOTSUPP; 904 905 rcu_read_lock(); 906 switch (sdata->vif.type) { 907 case NL80211_IFTYPE_AP_VLAN: 908 sta = rcu_dereference(sdata->u.vlan.sta); 909 if (sta) 910 break; 911 if (sdata->wdev.use_4addr) 912 goto out; 913 if (is_multicast_ether_addr(ctx->daddr)) 914 goto out; 915 sta = sta_info_get_bss(sdata, ctx->daddr); 916 break; 917 case NL80211_IFTYPE_AP: 918 if (is_multicast_ether_addr(ctx->daddr)) 919 goto out; 920 sta = sta_info_get(sdata, ctx->daddr); 921 break; 922 case NL80211_IFTYPE_STATION: 923 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 924 sta = sta_info_get(sdata, ctx->daddr); 925 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 926 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 927 goto out; 928 929 break; 930 } 931 } 932 933 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 934 break; 935 default: 936 goto out; 937 } 938 939 if (!sta) 940 goto out; 941 942 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 943 out: 944 rcu_read_unlock(); 945 946 return ret; 947 } 948 949 static const struct net_device_ops ieee80211_dataif_8023_ops = { 950 .ndo_open = ieee80211_open, 951 .ndo_stop = ieee80211_stop, 952 .ndo_uninit = ieee80211_uninit, 953 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 954 .ndo_set_rx_mode = ieee80211_set_multicast_list, 955 .ndo_set_mac_address = ieee80211_change_mac, 956 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 957 .ndo_setup_tc = ieee80211_netdev_setup_tc, 958 }; 959 960 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 961 { 962 switch (iftype) { 963 /* P2P GO and client are mapped to AP/STATION types */ 964 case NL80211_IFTYPE_AP: 965 case NL80211_IFTYPE_STATION: 966 return true; 967 default: 968 return false; 969 } 970 } 971 972 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 973 { 974 struct ieee80211_local *local = sdata->local; 975 u32 flags; 976 977 flags = sdata->vif.offload_flags; 978 979 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 980 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 981 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 982 983 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 984 local->hw.wiphy->frag_threshold != (u32)-1) 985 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 986 987 if (local->virt_monitors) 988 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 989 } else { 990 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 991 } 992 993 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 994 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 995 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 996 997 if (local->virt_monitors && 998 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 999 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1000 } else { 1001 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1002 } 1003 1004 if (sdata->vif.offload_flags == flags) 1005 return false; 1006 1007 sdata->vif.offload_flags = flags; 1008 ieee80211_check_fast_rx_iface(sdata); 1009 return true; 1010 } 1011 1012 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1013 { 1014 struct ieee80211_local *local = sdata->local; 1015 struct ieee80211_sub_if_data *bss = sdata; 1016 bool enabled; 1017 1018 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1019 if (!sdata->bss) 1020 return; 1021 1022 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1023 } 1024 1025 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1026 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1027 return; 1028 1029 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1030 if (sdata->wdev.use_4addr && 1031 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1032 enabled = false; 1033 1034 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1035 &ieee80211_dataif_ops; 1036 } 1037 1038 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1039 { 1040 struct ieee80211_local *local = sdata->local; 1041 struct ieee80211_sub_if_data *vsdata; 1042 1043 if (ieee80211_set_sdata_offload_flags(sdata)) { 1044 drv_update_vif_offload(local, sdata); 1045 ieee80211_set_vif_encap_ops(sdata); 1046 } 1047 1048 list_for_each_entry(vsdata, &local->interfaces, list) { 1049 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1050 vsdata->bss != &sdata->u.ap) 1051 continue; 1052 1053 ieee80211_set_vif_encap_ops(vsdata); 1054 } 1055 } 1056 1057 void ieee80211_recalc_offload(struct ieee80211_local *local) 1058 { 1059 struct ieee80211_sub_if_data *sdata; 1060 1061 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1062 return; 1063 1064 lockdep_assert_wiphy(local->hw.wiphy); 1065 1066 list_for_each_entry(sdata, &local->interfaces, list) { 1067 if (!ieee80211_sdata_running(sdata)) 1068 continue; 1069 1070 ieee80211_recalc_sdata_offload(sdata); 1071 } 1072 } 1073 1074 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1075 const int offset) 1076 { 1077 struct ieee80211_local *local = sdata->local; 1078 u32 flags = sdata->u.mntr.flags; 1079 1080 #define ADJUST(_f, _s) do { \ 1081 if (flags & MONITOR_FLAG_##_f) \ 1082 local->fif_##_s += offset; \ 1083 } while (0) 1084 1085 ADJUST(FCSFAIL, fcsfail); 1086 ADJUST(PLCPFAIL, plcpfail); 1087 ADJUST(CONTROL, control); 1088 ADJUST(CONTROL, pspoll); 1089 ADJUST(OTHER_BSS, other_bss); 1090 if (!(flags & MONITOR_FLAG_SKIP_TX)) 1091 local->tx_mntrs += offset; 1092 1093 #undef ADJUST 1094 } 1095 1096 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1097 { 1098 struct ieee80211_local *local = sdata->local; 1099 int i; 1100 1101 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1102 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1103 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1104 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1105 sdata->vif.hw_queue[i] = i; 1106 else 1107 sdata->vif.hw_queue[i] = 0; 1108 } 1109 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1110 } 1111 1112 static void ieee80211_sdata_init(struct ieee80211_local *local, 1113 struct ieee80211_sub_if_data *sdata) 1114 { 1115 sdata->local = local; 1116 1117 /* 1118 * Initialize the default link, so we can use link_id 0 for non-MLD, 1119 * and that continues to work for non-MLD-aware drivers that use just 1120 * vif.bss_conf instead of vif.link_conf. 1121 * 1122 * Note that we never change this, so if link ID 0 isn't used in an 1123 * MLD connection, we get a separate allocation for it. 1124 */ 1125 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1126 } 1127 1128 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1129 { 1130 struct ieee80211_sub_if_data *sdata; 1131 int ret; 1132 1133 ASSERT_RTNL(); 1134 lockdep_assert_wiphy(local->hw.wiphy); 1135 1136 if (local->monitor_sdata || 1137 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1138 return 0; 1139 1140 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1141 if (!sdata) 1142 return -ENOMEM; 1143 1144 /* set up data */ 1145 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1146 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1147 wiphy_name(local->hw.wiphy)); 1148 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1149 sdata->wdev.wiphy = local->hw.wiphy; 1150 1151 ieee80211_sdata_init(local, sdata); 1152 1153 ieee80211_set_default_queues(sdata); 1154 1155 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1156 ret = drv_add_interface(local, sdata); 1157 if (WARN_ON(ret)) { 1158 /* ok .. stupid driver, it asked for this! */ 1159 kfree(sdata); 1160 return ret; 1161 } 1162 } 1163 1164 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1165 1166 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1167 if (ret) { 1168 kfree(sdata); 1169 return ret; 1170 } 1171 1172 mutex_lock(&local->iflist_mtx); 1173 rcu_assign_pointer(local->monitor_sdata, sdata); 1174 mutex_unlock(&local->iflist_mtx); 1175 1176 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1177 IEEE80211_CHANCTX_EXCLUSIVE); 1178 if (ret) { 1179 mutex_lock(&local->iflist_mtx); 1180 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1181 mutex_unlock(&local->iflist_mtx); 1182 synchronize_net(); 1183 drv_remove_interface(local, sdata); 1184 kfree(sdata); 1185 return ret; 1186 } 1187 1188 skb_queue_head_init(&sdata->skb_queue); 1189 skb_queue_head_init(&sdata->status_queue); 1190 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1191 1192 return 0; 1193 } 1194 1195 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1196 { 1197 struct ieee80211_sub_if_data *sdata; 1198 1199 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1200 return; 1201 1202 ASSERT_RTNL(); 1203 lockdep_assert_wiphy(local->hw.wiphy); 1204 1205 mutex_lock(&local->iflist_mtx); 1206 1207 sdata = rcu_dereference_protected(local->monitor_sdata, 1208 lockdep_is_held(&local->iflist_mtx)); 1209 if (!sdata) { 1210 mutex_unlock(&local->iflist_mtx); 1211 return; 1212 } 1213 1214 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1215 ieee80211_link_release_channel(&sdata->deflink); 1216 1217 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1218 drv_remove_interface(local, sdata); 1219 1220 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1221 mutex_unlock(&local->iflist_mtx); 1222 1223 synchronize_net(); 1224 1225 kfree(sdata); 1226 } 1227 1228 /* 1229 * NOTE: Be very careful when changing this function, it must NOT return 1230 * an error on interface type changes that have been pre-checked, so most 1231 * checks should be in ieee80211_check_concurrent_iface. 1232 */ 1233 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1234 { 1235 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1236 struct net_device *dev = wdev->netdev; 1237 struct ieee80211_local *local = sdata->local; 1238 u64 changed = 0; 1239 int res; 1240 u32 hw_reconf_flags = 0; 1241 1242 lockdep_assert_wiphy(local->hw.wiphy); 1243 1244 switch (sdata->vif.type) { 1245 case NL80211_IFTYPE_AP_VLAN: { 1246 struct ieee80211_sub_if_data *master; 1247 1248 if (!sdata->bss) 1249 return -ENOLINK; 1250 1251 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1252 1253 master = container_of(sdata->bss, 1254 struct ieee80211_sub_if_data, u.ap); 1255 sdata->control_port_protocol = 1256 master->control_port_protocol; 1257 sdata->control_port_no_encrypt = 1258 master->control_port_no_encrypt; 1259 sdata->control_port_over_nl80211 = 1260 master->control_port_over_nl80211; 1261 sdata->control_port_no_preauth = 1262 master->control_port_no_preauth; 1263 sdata->vif.cab_queue = master->vif.cab_queue; 1264 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1265 sizeof(sdata->vif.hw_queue)); 1266 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1267 1268 sdata->crypto_tx_tailroom_needed_cnt += 1269 master->crypto_tx_tailroom_needed_cnt; 1270 1271 break; 1272 } 1273 case NL80211_IFTYPE_AP: 1274 sdata->bss = &sdata->u.ap; 1275 break; 1276 case NL80211_IFTYPE_MESH_POINT: 1277 case NL80211_IFTYPE_STATION: 1278 case NL80211_IFTYPE_MONITOR: 1279 case NL80211_IFTYPE_ADHOC: 1280 case NL80211_IFTYPE_P2P_DEVICE: 1281 case NL80211_IFTYPE_OCB: 1282 case NL80211_IFTYPE_NAN: 1283 /* no special treatment */ 1284 break; 1285 case NL80211_IFTYPE_UNSPECIFIED: 1286 case NUM_NL80211_IFTYPES: 1287 case NL80211_IFTYPE_P2P_CLIENT: 1288 case NL80211_IFTYPE_P2P_GO: 1289 case NL80211_IFTYPE_WDS: 1290 /* cannot happen */ 1291 WARN_ON(1); 1292 break; 1293 } 1294 1295 if (local->open_count == 0) { 1296 /* here we can consider everything in good order (again) */ 1297 local->reconfig_failure = false; 1298 1299 res = drv_start(local); 1300 if (res) 1301 goto err_del_bss; 1302 ieee80211_led_radio(local, true); 1303 ieee80211_mod_tpt_led_trig(local, 1304 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1305 } 1306 1307 /* 1308 * Copy the hopefully now-present MAC address to 1309 * this interface, if it has the special null one. 1310 */ 1311 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1312 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1313 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1314 1315 if (!is_valid_ether_addr(dev->dev_addr)) { 1316 res = -EADDRNOTAVAIL; 1317 goto err_stop; 1318 } 1319 } 1320 1321 sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR || 1322 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE); 1323 switch (sdata->vif.type) { 1324 case NL80211_IFTYPE_AP_VLAN: 1325 /* no need to tell driver, but set carrier and chanctx */ 1326 if (sdata->bss->active) { 1327 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1328 netif_carrier_on(dev); 1329 ieee80211_set_vif_encap_ops(sdata); 1330 } else { 1331 netif_carrier_off(dev); 1332 } 1333 break; 1334 case NL80211_IFTYPE_MONITOR: 1335 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1336 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1337 res = drv_add_interface(local, sdata); 1338 if (res) 1339 goto err_stop; 1340 } else { 1341 if (local->virt_monitors == 0 && local->open_count == 0) { 1342 res = ieee80211_add_virtual_monitor(local); 1343 if (res) 1344 goto err_stop; 1345 } 1346 local->virt_monitors++; 1347 1348 /* must be before the call to ieee80211_configure_filter */ 1349 if (local->virt_monitors == 1) { 1350 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1351 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1352 } 1353 } 1354 1355 local->monitors++; 1356 1357 ieee80211_adjust_monitor_flags(sdata, 1); 1358 ieee80211_configure_filter(local); 1359 ieee80211_recalc_offload(local); 1360 ieee80211_recalc_idle(local); 1361 1362 netif_carrier_on(dev); 1363 break; 1364 default: 1365 if (coming_up) { 1366 ieee80211_del_virtual_monitor(local); 1367 ieee80211_set_sdata_offload_flags(sdata); 1368 1369 res = drv_add_interface(local, sdata); 1370 if (res) 1371 goto err_stop; 1372 1373 ieee80211_set_vif_encap_ops(sdata); 1374 res = ieee80211_check_queues(sdata, 1375 ieee80211_vif_type_p2p(&sdata->vif)); 1376 if (res) 1377 goto err_del_interface; 1378 } 1379 1380 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1381 local->fif_pspoll++; 1382 local->fif_probe_req++; 1383 1384 ieee80211_configure_filter(local); 1385 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1386 local->fif_probe_req++; 1387 } 1388 1389 if (sdata->vif.probe_req_reg) 1390 drv_config_iface_filter(local, sdata, 1391 FIF_PROBE_REQ, 1392 FIF_PROBE_REQ); 1393 1394 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1395 sdata->vif.type != NL80211_IFTYPE_NAN) 1396 changed |= ieee80211_reset_erp_info(sdata); 1397 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1398 changed); 1399 1400 switch (sdata->vif.type) { 1401 case NL80211_IFTYPE_STATION: 1402 case NL80211_IFTYPE_ADHOC: 1403 case NL80211_IFTYPE_AP: 1404 case NL80211_IFTYPE_MESH_POINT: 1405 case NL80211_IFTYPE_OCB: 1406 netif_carrier_off(dev); 1407 break; 1408 case NL80211_IFTYPE_P2P_DEVICE: 1409 case NL80211_IFTYPE_NAN: 1410 break; 1411 default: 1412 /* not reached */ 1413 WARN_ON(1); 1414 } 1415 1416 /* 1417 * Set default queue parameters so drivers don't 1418 * need to initialise the hardware if the hardware 1419 * doesn't start up with sane defaults. 1420 * Enable QoS for anything but station interfaces. 1421 */ 1422 ieee80211_set_wmm_default(&sdata->deflink, true, 1423 sdata->vif.type != NL80211_IFTYPE_STATION); 1424 } 1425 1426 switch (sdata->vif.type) { 1427 case NL80211_IFTYPE_P2P_DEVICE: 1428 rcu_assign_pointer(local->p2p_sdata, sdata); 1429 break; 1430 case NL80211_IFTYPE_MONITOR: 1431 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1432 break; 1433 default: 1434 break; 1435 } 1436 1437 /* 1438 * set_multicast_list will be invoked by the networking core 1439 * which will check whether any increments here were done in 1440 * error and sync them down to the hardware as filter flags. 1441 */ 1442 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1443 atomic_inc(&local->iff_allmultis); 1444 1445 if (coming_up) 1446 local->open_count++; 1447 1448 if (local->open_count == 1) 1449 ieee80211_hw_conf_init(local); 1450 else if (hw_reconf_flags) 1451 ieee80211_hw_config(local, hw_reconf_flags); 1452 1453 ieee80211_recalc_ps(local); 1454 1455 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1456 1457 return 0; 1458 err_del_interface: 1459 drv_remove_interface(local, sdata); 1460 err_stop: 1461 if (!local->open_count) 1462 drv_stop(local, false); 1463 err_del_bss: 1464 sdata->bss = NULL; 1465 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1466 list_del(&sdata->u.vlan.list); 1467 /* might already be clear but that doesn't matter */ 1468 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1469 return res; 1470 } 1471 1472 static void ieee80211_if_setup(struct net_device *dev) 1473 { 1474 ether_setup(dev); 1475 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1476 dev->priv_flags |= IFF_NO_QUEUE; 1477 dev->netdev_ops = &ieee80211_dataif_ops; 1478 dev->needs_free_netdev = true; 1479 } 1480 1481 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1482 struct ieee80211_sub_if_data *sdata, 1483 struct sk_buff *skb) 1484 { 1485 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1486 1487 lockdep_assert_wiphy(local->hw.wiphy); 1488 1489 if (ieee80211_is_action(mgmt->frame_control) && 1490 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1491 struct sta_info *sta; 1492 int len = skb->len; 1493 1494 sta = sta_info_get_bss(sdata, mgmt->sa); 1495 if (sta) { 1496 switch (mgmt->u.action.u.addba_req.action_code) { 1497 case WLAN_ACTION_ADDBA_REQ: 1498 ieee80211_process_addba_request(local, sta, 1499 mgmt, len); 1500 break; 1501 case WLAN_ACTION_ADDBA_RESP: 1502 ieee80211_process_addba_resp(local, sta, 1503 mgmt, len); 1504 break; 1505 case WLAN_ACTION_DELBA: 1506 ieee80211_process_delba(sdata, sta, 1507 mgmt, len); 1508 break; 1509 default: 1510 WARN_ON(1); 1511 break; 1512 } 1513 } 1514 } else if (ieee80211_is_action(mgmt->frame_control) && 1515 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1516 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1517 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1518 struct ieee80211_rx_status *status; 1519 enum nl80211_band band; 1520 struct sta_info *sta; 1521 u8 opmode; 1522 1523 status = IEEE80211_SKB_RXCB(skb); 1524 band = status->band; 1525 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1526 1527 sta = sta_info_get_bss(sdata, mgmt->sa); 1528 1529 if (sta) 1530 ieee80211_vht_handle_opmode(sdata, 1531 &sta->deflink, 1532 opmode, band); 1533 1534 break; 1535 } 1536 case WLAN_VHT_ACTION_GROUPID_MGMT: 1537 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1538 mgmt); 1539 break; 1540 default: 1541 WARN_ON(1); 1542 break; 1543 } 1544 } else if (ieee80211_is_action(mgmt->frame_control) && 1545 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1546 switch (mgmt->u.action.u.s1g.action_code) { 1547 case WLAN_S1G_TWT_TEARDOWN: 1548 case WLAN_S1G_TWT_SETUP: 1549 ieee80211_s1g_rx_twt_action(sdata, skb); 1550 break; 1551 default: 1552 break; 1553 } 1554 } else if (ieee80211_is_action(mgmt->frame_control) && 1555 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1556 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1557 switch (mgmt->u.action.u.ttlm_req.action_code) { 1558 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1559 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1560 skb->len); 1561 break; 1562 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1563 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1564 skb->len); 1565 break; 1566 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 1567 ieee80211_process_ttlm_teardown(sdata); 1568 break; 1569 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 1570 ieee80211_process_ml_reconf_resp(sdata, mgmt, 1571 skb->len); 1572 break; 1573 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 1574 ieee80211_process_epcs_ena_resp(sdata, mgmt, 1575 skb->len); 1576 break; 1577 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 1578 ieee80211_process_epcs_teardown(sdata, mgmt, 1579 skb->len); 1580 break; 1581 default: 1582 break; 1583 } 1584 } 1585 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1586 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1587 ieee80211_sta_rx_queued_ext(sdata, skb); 1588 else 1589 WARN_ON(1); 1590 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1591 struct ieee80211_hdr *hdr = (void *)mgmt; 1592 struct sta_info *sta; 1593 1594 /* 1595 * So the frame isn't mgmt, but frame_control 1596 * is at the right place anyway, of course, so 1597 * the if statement is correct. 1598 * 1599 * Warn if we have other data frame types here, 1600 * they must not get here. 1601 */ 1602 WARN_ON(hdr->frame_control & 1603 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1604 WARN_ON(!(hdr->seq_ctrl & 1605 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1606 /* 1607 * This was a fragment of a frame, received while 1608 * a block-ack session was active. That cannot be 1609 * right, so terminate the session. 1610 */ 1611 sta = sta_info_get_bss(sdata, mgmt->sa); 1612 if (sta) { 1613 u16 tid = ieee80211_get_tid(hdr); 1614 1615 __ieee80211_stop_rx_ba_session( 1616 sta, tid, WLAN_BACK_RECIPIENT, 1617 WLAN_REASON_QSTA_REQUIRE_SETUP, 1618 true); 1619 } 1620 } else switch (sdata->vif.type) { 1621 case NL80211_IFTYPE_STATION: 1622 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1623 break; 1624 case NL80211_IFTYPE_ADHOC: 1625 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1626 break; 1627 case NL80211_IFTYPE_MESH_POINT: 1628 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1629 break; 1630 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1631 break; 1632 default: 1633 WARN(1, "frame for unexpected interface type"); 1634 break; 1635 } 1636 } 1637 1638 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1639 struct sk_buff *skb) 1640 { 1641 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1642 1643 if (ieee80211_is_action(mgmt->frame_control) && 1644 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1645 switch (mgmt->u.action.u.s1g.action_code) { 1646 case WLAN_S1G_TWT_TEARDOWN: 1647 case WLAN_S1G_TWT_SETUP: 1648 ieee80211_s1g_status_twt_action(sdata, skb); 1649 break; 1650 default: 1651 break; 1652 } 1653 } 1654 } 1655 1656 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1657 { 1658 struct ieee80211_sub_if_data *sdata = 1659 container_of(work, struct ieee80211_sub_if_data, work); 1660 struct ieee80211_local *local = sdata->local; 1661 struct sk_buff *skb; 1662 1663 if (!ieee80211_sdata_running(sdata)) 1664 return; 1665 1666 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1667 return; 1668 1669 if (!ieee80211_can_run_worker(local)) 1670 return; 1671 1672 /* first process frames */ 1673 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1674 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1675 1676 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1677 ieee80211_process_tdls_channel_switch(sdata, skb); 1678 else 1679 ieee80211_iface_process_skb(local, sdata, skb); 1680 1681 kfree_skb(skb); 1682 kcov_remote_stop(); 1683 } 1684 1685 /* process status queue */ 1686 while ((skb = skb_dequeue(&sdata->status_queue))) { 1687 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1688 1689 ieee80211_iface_process_status(sdata, skb); 1690 kfree_skb(skb); 1691 1692 kcov_remote_stop(); 1693 } 1694 1695 /* then other type-dependent work */ 1696 switch (sdata->vif.type) { 1697 case NL80211_IFTYPE_STATION: 1698 ieee80211_sta_work(sdata); 1699 break; 1700 case NL80211_IFTYPE_ADHOC: 1701 ieee80211_ibss_work(sdata); 1702 break; 1703 case NL80211_IFTYPE_MESH_POINT: 1704 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1705 break; 1706 ieee80211_mesh_work(sdata); 1707 break; 1708 case NL80211_IFTYPE_OCB: 1709 ieee80211_ocb_work(sdata); 1710 break; 1711 default: 1712 break; 1713 } 1714 } 1715 1716 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1717 struct wiphy_work *work) 1718 { 1719 struct ieee80211_sub_if_data *sdata = 1720 container_of(work, struct ieee80211_sub_if_data, 1721 activate_links_work); 1722 struct ieee80211_local *local = wiphy_priv(wiphy); 1723 1724 if (local->in_reconfig) 1725 return; 1726 1727 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1728 sdata->desired_active_links = 0; 1729 } 1730 1731 /* 1732 * Helper function to initialise an interface to a specific type. 1733 */ 1734 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1735 enum nl80211_iftype type) 1736 { 1737 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1738 0xff, 0xff, 0xff}; 1739 1740 /* clear type-dependent unions */ 1741 memset(&sdata->u, 0, sizeof(sdata->u)); 1742 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1743 1744 /* and set some type-dependent values */ 1745 sdata->vif.type = type; 1746 sdata->vif.p2p = false; 1747 sdata->wdev.iftype = type; 1748 1749 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1750 sdata->control_port_no_encrypt = false; 1751 sdata->control_port_over_nl80211 = false; 1752 sdata->control_port_no_preauth = false; 1753 sdata->vif.cfg.idle = true; 1754 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1755 1756 sdata->noack_map = 0; 1757 1758 /* only monitor/p2p-device differ */ 1759 if (sdata->dev) { 1760 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1761 sdata->dev->type = ARPHRD_ETHER; 1762 } 1763 1764 skb_queue_head_init(&sdata->skb_queue); 1765 skb_queue_head_init(&sdata->status_queue); 1766 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1767 wiphy_work_init(&sdata->activate_links_work, 1768 ieee80211_activate_links_work); 1769 1770 switch (type) { 1771 case NL80211_IFTYPE_P2P_GO: 1772 type = NL80211_IFTYPE_AP; 1773 sdata->vif.type = type; 1774 sdata->vif.p2p = true; 1775 fallthrough; 1776 case NL80211_IFTYPE_AP: 1777 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1778 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1779 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1780 break; 1781 case NL80211_IFTYPE_P2P_CLIENT: 1782 type = NL80211_IFTYPE_STATION; 1783 sdata->vif.type = type; 1784 sdata->vif.p2p = true; 1785 fallthrough; 1786 case NL80211_IFTYPE_STATION: 1787 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1788 ieee80211_sta_setup_sdata(sdata); 1789 break; 1790 case NL80211_IFTYPE_OCB: 1791 sdata->vif.bss_conf.bssid = bssid_wildcard; 1792 ieee80211_ocb_setup_sdata(sdata); 1793 break; 1794 case NL80211_IFTYPE_ADHOC: 1795 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1796 ieee80211_ibss_setup_sdata(sdata); 1797 break; 1798 case NL80211_IFTYPE_MESH_POINT: 1799 if (ieee80211_vif_is_mesh(&sdata->vif)) 1800 ieee80211_mesh_init_sdata(sdata); 1801 break; 1802 case NL80211_IFTYPE_MONITOR: 1803 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1804 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1805 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1806 MONITOR_FLAG_OTHER_BSS; 1807 break; 1808 case NL80211_IFTYPE_NAN: 1809 idr_init(&sdata->u.nan.function_inst_ids); 1810 spin_lock_init(&sdata->u.nan.func_lock); 1811 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1812 break; 1813 case NL80211_IFTYPE_AP_VLAN: 1814 case NL80211_IFTYPE_P2P_DEVICE: 1815 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1816 break; 1817 case NL80211_IFTYPE_UNSPECIFIED: 1818 case NL80211_IFTYPE_WDS: 1819 case NUM_NL80211_IFTYPES: 1820 WARN_ON(1); 1821 break; 1822 } 1823 1824 /* need to do this after the switch so vif.type is correct */ 1825 ieee80211_link_setup(&sdata->deflink); 1826 1827 ieee80211_debugfs_recreate_netdev(sdata, false); 1828 } 1829 1830 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1831 enum nl80211_iftype type) 1832 { 1833 struct ieee80211_local *local = sdata->local; 1834 int ret, err; 1835 enum nl80211_iftype internal_type = type; 1836 bool p2p = false; 1837 1838 ASSERT_RTNL(); 1839 1840 if (!local->ops->change_interface) 1841 return -EBUSY; 1842 1843 /* for now, don't support changing while links exist */ 1844 if (ieee80211_vif_is_mld(&sdata->vif)) 1845 return -EBUSY; 1846 1847 switch (sdata->vif.type) { 1848 case NL80211_IFTYPE_AP: 1849 if (!list_empty(&sdata->u.ap.vlans)) 1850 return -EBUSY; 1851 break; 1852 case NL80211_IFTYPE_STATION: 1853 case NL80211_IFTYPE_ADHOC: 1854 case NL80211_IFTYPE_OCB: 1855 /* 1856 * Could maybe also all others here? 1857 * Just not sure how that interacts 1858 * with the RX/config path e.g. for 1859 * mesh. 1860 */ 1861 break; 1862 default: 1863 return -EBUSY; 1864 } 1865 1866 switch (type) { 1867 case NL80211_IFTYPE_AP: 1868 case NL80211_IFTYPE_STATION: 1869 case NL80211_IFTYPE_ADHOC: 1870 case NL80211_IFTYPE_OCB: 1871 /* 1872 * Could probably support everything 1873 * but here. 1874 */ 1875 break; 1876 case NL80211_IFTYPE_P2P_CLIENT: 1877 p2p = true; 1878 internal_type = NL80211_IFTYPE_STATION; 1879 break; 1880 case NL80211_IFTYPE_P2P_GO: 1881 p2p = true; 1882 internal_type = NL80211_IFTYPE_AP; 1883 break; 1884 default: 1885 return -EBUSY; 1886 } 1887 1888 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1889 if (ret) 1890 return ret; 1891 1892 ieee80211_stop_vif_queues(local, sdata, 1893 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1894 /* do_stop will synchronize_rcu() first thing */ 1895 ieee80211_do_stop(sdata, false); 1896 1897 ieee80211_teardown_sdata(sdata); 1898 1899 ieee80211_set_sdata_offload_flags(sdata); 1900 ret = drv_change_interface(local, sdata, internal_type, p2p); 1901 if (ret) 1902 type = ieee80211_vif_type_p2p(&sdata->vif); 1903 1904 /* 1905 * Ignore return value here, there's not much we can do since 1906 * the driver changed the interface type internally already. 1907 * The warnings will hopefully make driver authors fix it :-) 1908 */ 1909 ieee80211_check_queues(sdata, type); 1910 1911 ieee80211_setup_sdata(sdata, type); 1912 ieee80211_set_vif_encap_ops(sdata); 1913 1914 err = ieee80211_do_open(&sdata->wdev, false); 1915 WARN(err, "type change: do_open returned %d", err); 1916 1917 ieee80211_wake_vif_queues(local, sdata, 1918 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1919 return ret; 1920 } 1921 1922 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1923 enum nl80211_iftype type) 1924 { 1925 int ret; 1926 1927 ASSERT_RTNL(); 1928 1929 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1930 return 0; 1931 1932 if (ieee80211_sdata_running(sdata)) { 1933 ret = ieee80211_runtime_change_iftype(sdata, type); 1934 if (ret) 1935 return ret; 1936 } else { 1937 /* Purge and reset type-dependent state. */ 1938 ieee80211_teardown_sdata(sdata); 1939 ieee80211_setup_sdata(sdata, type); 1940 } 1941 1942 /* reset some values that shouldn't be kept across type changes */ 1943 if (type == NL80211_IFTYPE_STATION) 1944 sdata->u.mgd.use_4addr = false; 1945 1946 return 0; 1947 } 1948 1949 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1950 u8 *perm_addr, enum nl80211_iftype type) 1951 { 1952 struct ieee80211_sub_if_data *sdata; 1953 u64 mask, start, addr, val, inc; 1954 u8 *m; 1955 u8 tmp_addr[ETH_ALEN]; 1956 int i; 1957 1958 lockdep_assert_wiphy(local->hw.wiphy); 1959 1960 /* default ... something at least */ 1961 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1962 1963 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1964 local->hw.wiphy->n_addresses <= 1) 1965 return; 1966 1967 switch (type) { 1968 case NL80211_IFTYPE_MONITOR: 1969 /* doesn't matter */ 1970 break; 1971 case NL80211_IFTYPE_AP_VLAN: 1972 /* match up with an AP interface */ 1973 list_for_each_entry(sdata, &local->interfaces, list) { 1974 if (sdata->vif.type != NL80211_IFTYPE_AP) 1975 continue; 1976 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1977 break; 1978 } 1979 /* keep default if no AP interface present */ 1980 break; 1981 case NL80211_IFTYPE_P2P_CLIENT: 1982 case NL80211_IFTYPE_P2P_GO: 1983 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1984 list_for_each_entry(sdata, &local->interfaces, list) { 1985 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1986 continue; 1987 if (!ieee80211_sdata_running(sdata)) 1988 continue; 1989 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1990 return; 1991 } 1992 } 1993 fallthrough; 1994 default: 1995 /* assign a new address if possible -- try n_addresses first */ 1996 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1997 bool used = false; 1998 1999 list_for_each_entry(sdata, &local->interfaces, list) { 2000 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 2001 sdata->vif.addr)) { 2002 used = true; 2003 break; 2004 } 2005 } 2006 2007 if (!used) { 2008 memcpy(perm_addr, 2009 local->hw.wiphy->addresses[i].addr, 2010 ETH_ALEN); 2011 break; 2012 } 2013 } 2014 2015 /* try mask if available */ 2016 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 2017 break; 2018 2019 m = local->hw.wiphy->addr_mask; 2020 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2021 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2022 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2023 2024 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2025 /* not a contiguous mask ... not handled now! */ 2026 pr_info("not contiguous\n"); 2027 break; 2028 } 2029 2030 /* 2031 * Pick address of existing interface in case user changed 2032 * MAC address manually, default to perm_addr. 2033 */ 2034 m = local->hw.wiphy->perm_addr; 2035 list_for_each_entry(sdata, &local->interfaces, list) { 2036 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2037 continue; 2038 m = sdata->vif.addr; 2039 break; 2040 } 2041 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2042 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2043 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2044 2045 inc = 1ULL<<__ffs64(mask); 2046 val = (start & mask); 2047 addr = (start & ~mask) | (val & mask); 2048 do { 2049 bool used = false; 2050 2051 tmp_addr[5] = addr >> 0*8; 2052 tmp_addr[4] = addr >> 1*8; 2053 tmp_addr[3] = addr >> 2*8; 2054 tmp_addr[2] = addr >> 3*8; 2055 tmp_addr[1] = addr >> 4*8; 2056 tmp_addr[0] = addr >> 5*8; 2057 2058 val += inc; 2059 2060 list_for_each_entry(sdata, &local->interfaces, list) { 2061 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2062 used = true; 2063 break; 2064 } 2065 } 2066 2067 if (!used) { 2068 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2069 break; 2070 } 2071 addr = (start & ~mask) | (val & mask); 2072 } while (addr != start); 2073 2074 break; 2075 } 2076 } 2077 2078 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2079 unsigned char name_assign_type, 2080 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2081 struct vif_params *params) 2082 { 2083 struct net_device *ndev = NULL; 2084 struct ieee80211_sub_if_data *sdata = NULL; 2085 struct txq_info *txqi; 2086 int ret, i; 2087 2088 ASSERT_RTNL(); 2089 lockdep_assert_wiphy(local->hw.wiphy); 2090 2091 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2092 struct wireless_dev *wdev; 2093 2094 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2095 GFP_KERNEL); 2096 if (!sdata) 2097 return -ENOMEM; 2098 wdev = &sdata->wdev; 2099 2100 sdata->dev = NULL; 2101 strscpy(sdata->name, name, IFNAMSIZ); 2102 ieee80211_assign_perm_addr(local, wdev->address, type); 2103 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2104 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2105 } else { 2106 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2107 sizeof(void *)); 2108 int txq_size = 0; 2109 2110 if (type != NL80211_IFTYPE_AP_VLAN && 2111 (type != NL80211_IFTYPE_MONITOR || 2112 (params->flags & MONITOR_FLAG_ACTIVE))) 2113 txq_size += sizeof(struct txq_info) + 2114 local->hw.txq_data_size; 2115 2116 ndev = alloc_netdev_mqs(size + txq_size, 2117 name, name_assign_type, 2118 ieee80211_if_setup, 1, 1); 2119 if (!ndev) 2120 return -ENOMEM; 2121 2122 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2123 2124 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2125 2126 ndev->needed_headroom = local->tx_headroom + 2127 4*6 /* four MAC addresses */ 2128 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2129 + 6 /* mesh */ 2130 + 8 /* rfc1042/bridge tunnel */ 2131 - ETH_HLEN /* ethernet hard_header_len */ 2132 + IEEE80211_ENCRYPT_HEADROOM; 2133 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2134 2135 ret = dev_alloc_name(ndev, ndev->name); 2136 if (ret < 0) { 2137 free_netdev(ndev); 2138 return ret; 2139 } 2140 2141 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2142 if (is_valid_ether_addr(params->macaddr)) 2143 eth_hw_addr_set(ndev, params->macaddr); 2144 else 2145 eth_hw_addr_set(ndev, ndev->perm_addr); 2146 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2147 2148 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2149 sdata = netdev_priv(ndev); 2150 ndev->ieee80211_ptr = &sdata->wdev; 2151 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2152 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2153 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2154 2155 if (txq_size) { 2156 txqi = netdev_priv(ndev) + size; 2157 ieee80211_txq_init(sdata, NULL, txqi, 0); 2158 } 2159 2160 sdata->dev = ndev; 2161 } 2162 2163 /* initialise type-independent data */ 2164 sdata->wdev.wiphy = local->hw.wiphy; 2165 2166 ieee80211_sdata_init(local, sdata); 2167 2168 ieee80211_init_frag_cache(&sdata->frags); 2169 2170 INIT_LIST_HEAD(&sdata->key_list); 2171 2172 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2173 ieee80211_delayed_tailroom_dec); 2174 2175 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2176 struct ieee80211_supported_band *sband; 2177 sband = local->hw.wiphy->bands[i]; 2178 sdata->rc_rateidx_mask[i] = 2179 sband ? (1 << sband->n_bitrates) - 1 : 0; 2180 if (sband) { 2181 __le16 cap; 2182 u16 *vht_rate_mask; 2183 2184 memcpy(sdata->rc_rateidx_mcs_mask[i], 2185 sband->ht_cap.mcs.rx_mask, 2186 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2187 2188 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2189 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2190 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2191 } else { 2192 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2193 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2194 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2195 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2196 } 2197 } 2198 2199 ieee80211_set_default_queues(sdata); 2200 2201 /* setup type-dependent data */ 2202 ieee80211_setup_sdata(sdata, type); 2203 2204 if (ndev) { 2205 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2206 if (type == NL80211_IFTYPE_STATION) 2207 sdata->u.mgd.use_4addr = params->use_4addr; 2208 2209 ndev->features |= local->hw.netdev_features; 2210 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2211 ndev->hw_features |= ndev->features & 2212 MAC80211_SUPPORTED_FEATURES_TX; 2213 sdata->vif.netdev_features = local->hw.netdev_features; 2214 2215 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2216 2217 /* MTU range is normally 256 - 2304, where the upper limit is 2218 * the maximum MSDU size. Monitor interfaces send and receive 2219 * MPDU and A-MSDU frames which may be much larger so we do 2220 * not impose an upper limit in that case. 2221 */ 2222 ndev->min_mtu = 256; 2223 if (type == NL80211_IFTYPE_MONITOR) 2224 ndev->max_mtu = 0; 2225 else 2226 ndev->max_mtu = local->hw.max_mtu; 2227 2228 ret = cfg80211_register_netdevice(ndev); 2229 if (ret) { 2230 free_netdev(ndev); 2231 return ret; 2232 } 2233 } 2234 2235 mutex_lock(&local->iflist_mtx); 2236 list_add_tail_rcu(&sdata->list, &local->interfaces); 2237 mutex_unlock(&local->iflist_mtx); 2238 2239 if (new_wdev) 2240 *new_wdev = &sdata->wdev; 2241 2242 return 0; 2243 } 2244 2245 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2246 { 2247 ASSERT_RTNL(); 2248 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2249 2250 mutex_lock(&sdata->local->iflist_mtx); 2251 list_del_rcu(&sdata->list); 2252 mutex_unlock(&sdata->local->iflist_mtx); 2253 2254 if (sdata->vif.txq) 2255 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2256 2257 synchronize_rcu(); 2258 2259 cfg80211_unregister_wdev(&sdata->wdev); 2260 2261 if (!sdata->dev) { 2262 ieee80211_teardown_sdata(sdata); 2263 kfree(sdata); 2264 } 2265 } 2266 2267 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2268 { 2269 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2270 return; 2271 ieee80211_do_stop(sdata, true); 2272 } 2273 2274 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2275 { 2276 struct ieee80211_sub_if_data *sdata, *tmp; 2277 LIST_HEAD(unreg_list); 2278 2279 ASSERT_RTNL(); 2280 2281 /* Before destroying the interfaces, make sure they're all stopped so 2282 * that the hardware is stopped. Otherwise, the driver might still be 2283 * iterating the interfaces during the shutdown, e.g. from a worker 2284 * or from RX processing or similar, and if it does so (using atomic 2285 * iteration) while we're manipulating the list, the iteration will 2286 * crash. 2287 * 2288 * After this, the hardware should be stopped and the driver should 2289 * have stopped all of its activities, so that we can do RCU-unaware 2290 * manipulations of the interface list below. 2291 */ 2292 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2293 2294 guard(wiphy)(local->hw.wiphy); 2295 2296 WARN(local->open_count, "%s: open count remains %d\n", 2297 wiphy_name(local->hw.wiphy), local->open_count); 2298 2299 mutex_lock(&local->iflist_mtx); 2300 list_splice_init(&local->interfaces, &unreg_list); 2301 mutex_unlock(&local->iflist_mtx); 2302 2303 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2304 bool netdev = sdata->dev; 2305 2306 /* 2307 * Remove IP addresses explicitly, since the notifier will 2308 * skip the callbacks if wdev->registered is false, since 2309 * we can't acquire the wiphy_lock() again there if already 2310 * inside this locked section. 2311 */ 2312 sdata->vif.cfg.arp_addr_cnt = 0; 2313 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2314 sdata->u.mgd.associated) 2315 ieee80211_vif_cfg_change_notify(sdata, 2316 BSS_CHANGED_ARP_FILTER); 2317 2318 list_del(&sdata->list); 2319 cfg80211_unregister_wdev(&sdata->wdev); 2320 2321 if (!netdev) 2322 kfree(sdata); 2323 } 2324 } 2325 2326 static int netdev_notify(struct notifier_block *nb, 2327 unsigned long state, void *ptr) 2328 { 2329 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2330 struct ieee80211_sub_if_data *sdata; 2331 2332 if (state != NETDEV_CHANGENAME) 2333 return NOTIFY_DONE; 2334 2335 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2336 return NOTIFY_DONE; 2337 2338 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2339 return NOTIFY_DONE; 2340 2341 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2342 memcpy(sdata->name, dev->name, IFNAMSIZ); 2343 ieee80211_debugfs_rename_netdev(sdata); 2344 2345 return NOTIFY_OK; 2346 } 2347 2348 static struct notifier_block mac80211_netdev_notifier = { 2349 .notifier_call = netdev_notify, 2350 }; 2351 2352 int ieee80211_iface_init(void) 2353 { 2354 return register_netdevice_notifier(&mac80211_netdev_notifier); 2355 } 2356 2357 void ieee80211_iface_exit(void) 2358 { 2359 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2360 } 2361 2362 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2363 { 2364 if (sdata->vif.type == NL80211_IFTYPE_AP) 2365 atomic_inc(&sdata->u.ap.num_mcast_sta); 2366 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2367 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2368 } 2369 2370 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2371 { 2372 if (sdata->vif.type == NL80211_IFTYPE_AP) 2373 atomic_dec(&sdata->u.ap.num_mcast_sta); 2374 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2375 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2376 } 2377 2378 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2379 { 2380 struct ieee80211_local *local = sdata->local; 2381 2382 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2383 return; 2384 2385 ieee80211_stop_vif_queues_norefcount(local, sdata, 2386 IEEE80211_QUEUE_STOP_REASON_CSA); 2387 } 2388 2389 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2390 { 2391 struct ieee80211_local *local = sdata->local; 2392 2393 ieee80211_wake_vif_queues_norefcount(local, sdata, 2394 IEEE80211_QUEUE_STOP_REASON_CSA); 2395 } 2396