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