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 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1212 ieee80211_link_release_channel(&sdata->deflink); 1213 1214 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1215 drv_remove_interface(local, sdata); 1216 1217 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1218 mutex_unlock(&local->iflist_mtx); 1219 1220 synchronize_net(); 1221 1222 kfree(sdata); 1223 } 1224 1225 /* 1226 * NOTE: Be very careful when changing this function, it must NOT return 1227 * an error on interface type changes that have been pre-checked, so most 1228 * checks should be in ieee80211_check_concurrent_iface. 1229 */ 1230 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1231 { 1232 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1233 struct net_device *dev = wdev->netdev; 1234 struct ieee80211_local *local = sdata->local; 1235 u64 changed = 0; 1236 int res; 1237 u32 hw_reconf_flags = 0; 1238 1239 lockdep_assert_wiphy(local->hw.wiphy); 1240 1241 switch (sdata->vif.type) { 1242 case NL80211_IFTYPE_AP_VLAN: { 1243 struct ieee80211_sub_if_data *master; 1244 1245 if (!sdata->bss) 1246 return -ENOLINK; 1247 1248 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1249 1250 master = container_of(sdata->bss, 1251 struct ieee80211_sub_if_data, u.ap); 1252 sdata->control_port_protocol = 1253 master->control_port_protocol; 1254 sdata->control_port_no_encrypt = 1255 master->control_port_no_encrypt; 1256 sdata->control_port_over_nl80211 = 1257 master->control_port_over_nl80211; 1258 sdata->control_port_no_preauth = 1259 master->control_port_no_preauth; 1260 sdata->vif.cab_queue = master->vif.cab_queue; 1261 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1262 sizeof(sdata->vif.hw_queue)); 1263 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1264 1265 sdata->crypto_tx_tailroom_needed_cnt += 1266 master->crypto_tx_tailroom_needed_cnt; 1267 1268 break; 1269 } 1270 case NL80211_IFTYPE_AP: 1271 sdata->bss = &sdata->u.ap; 1272 break; 1273 case NL80211_IFTYPE_MESH_POINT: 1274 case NL80211_IFTYPE_STATION: 1275 case NL80211_IFTYPE_MONITOR: 1276 case NL80211_IFTYPE_ADHOC: 1277 case NL80211_IFTYPE_P2P_DEVICE: 1278 case NL80211_IFTYPE_OCB: 1279 case NL80211_IFTYPE_NAN: 1280 /* no special treatment */ 1281 break; 1282 case NL80211_IFTYPE_UNSPECIFIED: 1283 case NUM_NL80211_IFTYPES: 1284 case NL80211_IFTYPE_P2P_CLIENT: 1285 case NL80211_IFTYPE_P2P_GO: 1286 case NL80211_IFTYPE_WDS: 1287 /* cannot happen */ 1288 WARN_ON(1); 1289 break; 1290 } 1291 1292 if (local->open_count == 0) { 1293 /* here we can consider everything in good order (again) */ 1294 local->reconfig_failure = false; 1295 1296 res = drv_start(local); 1297 if (res) 1298 goto err_del_bss; 1299 ieee80211_led_radio(local, true); 1300 ieee80211_mod_tpt_led_trig(local, 1301 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1302 } 1303 1304 /* 1305 * Copy the hopefully now-present MAC address to 1306 * this interface, if it has the special null one. 1307 */ 1308 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1309 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1310 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1311 1312 if (!is_valid_ether_addr(dev->dev_addr)) { 1313 res = -EADDRNOTAVAIL; 1314 goto err_stop; 1315 } 1316 } 1317 1318 sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR || 1319 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE); 1320 switch (sdata->vif.type) { 1321 case NL80211_IFTYPE_AP_VLAN: 1322 /* no need to tell driver, but set carrier and chanctx */ 1323 if (sdata->bss->active) { 1324 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1325 netif_carrier_on(dev); 1326 ieee80211_set_vif_encap_ops(sdata); 1327 } else { 1328 netif_carrier_off(dev); 1329 } 1330 break; 1331 case NL80211_IFTYPE_MONITOR: 1332 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1333 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1334 res = drv_add_interface(local, sdata); 1335 if (res) 1336 goto err_stop; 1337 } else { 1338 if (local->virt_monitors == 0 && local->open_count == 0) { 1339 res = ieee80211_add_virtual_monitor(local); 1340 if (res) 1341 goto err_stop; 1342 } 1343 local->virt_monitors++; 1344 1345 /* must be before the call to ieee80211_configure_filter */ 1346 if (local->virt_monitors == 1) { 1347 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1348 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1349 } 1350 } 1351 1352 local->monitors++; 1353 1354 ieee80211_adjust_monitor_flags(sdata, 1); 1355 ieee80211_configure_filter(local); 1356 ieee80211_recalc_offload(local); 1357 ieee80211_recalc_idle(local); 1358 1359 netif_carrier_on(dev); 1360 break; 1361 default: 1362 if (coming_up) { 1363 ieee80211_del_virtual_monitor(local); 1364 ieee80211_set_sdata_offload_flags(sdata); 1365 1366 res = drv_add_interface(local, sdata); 1367 if (res) 1368 goto err_stop; 1369 1370 ieee80211_set_vif_encap_ops(sdata); 1371 res = ieee80211_check_queues(sdata, 1372 ieee80211_vif_type_p2p(&sdata->vif)); 1373 if (res) 1374 goto err_del_interface; 1375 } 1376 1377 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1378 local->fif_pspoll++; 1379 local->fif_probe_req++; 1380 1381 ieee80211_configure_filter(local); 1382 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1383 local->fif_probe_req++; 1384 } 1385 1386 if (sdata->vif.probe_req_reg) 1387 drv_config_iface_filter(local, sdata, 1388 FIF_PROBE_REQ, 1389 FIF_PROBE_REQ); 1390 1391 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1392 sdata->vif.type != NL80211_IFTYPE_NAN) 1393 changed |= ieee80211_reset_erp_info(sdata); 1394 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1395 changed); 1396 1397 switch (sdata->vif.type) { 1398 case NL80211_IFTYPE_STATION: 1399 case NL80211_IFTYPE_ADHOC: 1400 case NL80211_IFTYPE_AP: 1401 case NL80211_IFTYPE_MESH_POINT: 1402 case NL80211_IFTYPE_OCB: 1403 netif_carrier_off(dev); 1404 break; 1405 case NL80211_IFTYPE_P2P_DEVICE: 1406 case NL80211_IFTYPE_NAN: 1407 break; 1408 default: 1409 /* not reached */ 1410 WARN_ON(1); 1411 } 1412 1413 /* 1414 * Set default queue parameters so drivers don't 1415 * need to initialise the hardware if the hardware 1416 * doesn't start up with sane defaults. 1417 * Enable QoS for anything but station interfaces. 1418 */ 1419 ieee80211_set_wmm_default(&sdata->deflink, true, 1420 sdata->vif.type != NL80211_IFTYPE_STATION); 1421 } 1422 1423 switch (sdata->vif.type) { 1424 case NL80211_IFTYPE_P2P_DEVICE: 1425 rcu_assign_pointer(local->p2p_sdata, sdata); 1426 break; 1427 case NL80211_IFTYPE_MONITOR: 1428 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1429 break; 1430 default: 1431 break; 1432 } 1433 1434 /* 1435 * set_multicast_list will be invoked by the networking core 1436 * which will check whether any increments here were done in 1437 * error and sync them down to the hardware as filter flags. 1438 */ 1439 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1440 atomic_inc(&local->iff_allmultis); 1441 1442 if (coming_up) 1443 local->open_count++; 1444 1445 if (local->open_count == 1) 1446 ieee80211_hw_conf_init(local); 1447 else if (hw_reconf_flags) 1448 ieee80211_hw_config(local, hw_reconf_flags); 1449 1450 ieee80211_recalc_ps(local); 1451 1452 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1453 1454 return 0; 1455 err_del_interface: 1456 drv_remove_interface(local, sdata); 1457 err_stop: 1458 if (!local->open_count) 1459 drv_stop(local, false); 1460 err_del_bss: 1461 sdata->bss = NULL; 1462 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1463 list_del(&sdata->u.vlan.list); 1464 /* might already be clear but that doesn't matter */ 1465 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1466 return res; 1467 } 1468 1469 static void ieee80211_if_setup(struct net_device *dev) 1470 { 1471 ether_setup(dev); 1472 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1473 dev->priv_flags |= IFF_NO_QUEUE; 1474 dev->netdev_ops = &ieee80211_dataif_ops; 1475 dev->needs_free_netdev = true; 1476 } 1477 1478 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1479 struct ieee80211_sub_if_data *sdata, 1480 struct sk_buff *skb) 1481 { 1482 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1483 1484 lockdep_assert_wiphy(local->hw.wiphy); 1485 1486 if (ieee80211_is_action(mgmt->frame_control) && 1487 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1488 struct sta_info *sta; 1489 int len = skb->len; 1490 1491 sta = sta_info_get_bss(sdata, mgmt->sa); 1492 if (sta) { 1493 switch (mgmt->u.action.u.addba_req.action_code) { 1494 case WLAN_ACTION_ADDBA_REQ: 1495 ieee80211_process_addba_request(local, sta, 1496 mgmt, len); 1497 break; 1498 case WLAN_ACTION_ADDBA_RESP: 1499 ieee80211_process_addba_resp(local, sta, 1500 mgmt, len); 1501 break; 1502 case WLAN_ACTION_DELBA: 1503 ieee80211_process_delba(sdata, sta, 1504 mgmt, len); 1505 break; 1506 default: 1507 WARN_ON(1); 1508 break; 1509 } 1510 } 1511 } else if (ieee80211_is_action(mgmt->frame_control) && 1512 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1513 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1514 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1515 struct ieee80211_rx_status *status; 1516 enum nl80211_band band; 1517 struct sta_info *sta; 1518 u8 opmode; 1519 1520 status = IEEE80211_SKB_RXCB(skb); 1521 band = status->band; 1522 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1523 1524 sta = sta_info_get_bss(sdata, mgmt->sa); 1525 1526 if (sta) 1527 ieee80211_vht_handle_opmode(sdata, 1528 &sta->deflink, 1529 opmode, band); 1530 1531 break; 1532 } 1533 case WLAN_VHT_ACTION_GROUPID_MGMT: 1534 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1535 mgmt); 1536 break; 1537 default: 1538 WARN_ON(1); 1539 break; 1540 } 1541 } else if (ieee80211_is_action(mgmt->frame_control) && 1542 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1543 switch (mgmt->u.action.u.s1g.action_code) { 1544 case WLAN_S1G_TWT_TEARDOWN: 1545 case WLAN_S1G_TWT_SETUP: 1546 ieee80211_s1g_rx_twt_action(sdata, skb); 1547 break; 1548 default: 1549 break; 1550 } 1551 } else if (ieee80211_is_action(mgmt->frame_control) && 1552 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1553 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1554 switch (mgmt->u.action.u.ttlm_req.action_code) { 1555 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1556 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1557 skb->len); 1558 break; 1559 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1560 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1561 skb->len); 1562 break; 1563 case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN: 1564 ieee80211_process_ttlm_teardown(sdata); 1565 break; 1566 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 1567 ieee80211_process_ml_reconf_resp(sdata, mgmt, 1568 skb->len); 1569 break; 1570 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP: 1571 ieee80211_process_epcs_ena_resp(sdata, mgmt, 1572 skb->len); 1573 break; 1574 case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN: 1575 ieee80211_process_epcs_teardown(sdata, mgmt, 1576 skb->len); 1577 break; 1578 default: 1579 break; 1580 } 1581 } 1582 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1583 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1584 ieee80211_sta_rx_queued_ext(sdata, skb); 1585 else 1586 WARN_ON(1); 1587 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1588 struct ieee80211_hdr *hdr = (void *)mgmt; 1589 struct sta_info *sta; 1590 1591 /* 1592 * So the frame isn't mgmt, but frame_control 1593 * is at the right place anyway, of course, so 1594 * the if statement is correct. 1595 * 1596 * Warn if we have other data frame types here, 1597 * they must not get here. 1598 */ 1599 WARN_ON(hdr->frame_control & 1600 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1601 WARN_ON(!(hdr->seq_ctrl & 1602 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1603 /* 1604 * This was a fragment of a frame, received while 1605 * a block-ack session was active. That cannot be 1606 * right, so terminate the session. 1607 */ 1608 sta = sta_info_get_bss(sdata, mgmt->sa); 1609 if (sta) { 1610 u16 tid = ieee80211_get_tid(hdr); 1611 1612 __ieee80211_stop_rx_ba_session( 1613 sta, tid, WLAN_BACK_RECIPIENT, 1614 WLAN_REASON_QSTA_REQUIRE_SETUP, 1615 true); 1616 } 1617 } else switch (sdata->vif.type) { 1618 case NL80211_IFTYPE_STATION: 1619 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1620 break; 1621 case NL80211_IFTYPE_ADHOC: 1622 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1623 break; 1624 case NL80211_IFTYPE_MESH_POINT: 1625 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1626 break; 1627 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1628 break; 1629 default: 1630 WARN(1, "frame for unexpected interface type"); 1631 break; 1632 } 1633 } 1634 1635 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1636 struct sk_buff *skb) 1637 { 1638 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1639 1640 if (ieee80211_is_action(mgmt->frame_control) && 1641 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1642 switch (mgmt->u.action.u.s1g.action_code) { 1643 case WLAN_S1G_TWT_TEARDOWN: 1644 case WLAN_S1G_TWT_SETUP: 1645 ieee80211_s1g_status_twt_action(sdata, skb); 1646 break; 1647 default: 1648 break; 1649 } 1650 } 1651 } 1652 1653 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1654 { 1655 struct ieee80211_sub_if_data *sdata = 1656 container_of(work, struct ieee80211_sub_if_data, work); 1657 struct ieee80211_local *local = sdata->local; 1658 struct sk_buff *skb; 1659 1660 if (!ieee80211_sdata_running(sdata)) 1661 return; 1662 1663 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1664 return; 1665 1666 if (!ieee80211_can_run_worker(local)) 1667 return; 1668 1669 /* first process frames */ 1670 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1671 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1672 1673 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1674 ieee80211_process_tdls_channel_switch(sdata, skb); 1675 else 1676 ieee80211_iface_process_skb(local, sdata, skb); 1677 1678 kfree_skb(skb); 1679 kcov_remote_stop(); 1680 } 1681 1682 /* process status queue */ 1683 while ((skb = skb_dequeue(&sdata->status_queue))) { 1684 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1685 1686 ieee80211_iface_process_status(sdata, skb); 1687 kfree_skb(skb); 1688 1689 kcov_remote_stop(); 1690 } 1691 1692 /* then other type-dependent work */ 1693 switch (sdata->vif.type) { 1694 case NL80211_IFTYPE_STATION: 1695 ieee80211_sta_work(sdata); 1696 break; 1697 case NL80211_IFTYPE_ADHOC: 1698 ieee80211_ibss_work(sdata); 1699 break; 1700 case NL80211_IFTYPE_MESH_POINT: 1701 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1702 break; 1703 ieee80211_mesh_work(sdata); 1704 break; 1705 case NL80211_IFTYPE_OCB: 1706 ieee80211_ocb_work(sdata); 1707 break; 1708 default: 1709 break; 1710 } 1711 } 1712 1713 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1714 struct wiphy_work *work) 1715 { 1716 struct ieee80211_sub_if_data *sdata = 1717 container_of(work, struct ieee80211_sub_if_data, 1718 activate_links_work); 1719 struct ieee80211_local *local = wiphy_priv(wiphy); 1720 1721 if (local->in_reconfig) 1722 return; 1723 1724 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1725 sdata->desired_active_links = 0; 1726 } 1727 1728 /* 1729 * Helper function to initialise an interface to a specific type. 1730 */ 1731 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1732 enum nl80211_iftype type) 1733 { 1734 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1735 0xff, 0xff, 0xff}; 1736 1737 /* clear type-dependent unions */ 1738 memset(&sdata->u, 0, sizeof(sdata->u)); 1739 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1740 1741 /* and set some type-dependent values */ 1742 sdata->vif.type = type; 1743 sdata->vif.p2p = false; 1744 sdata->wdev.iftype = type; 1745 1746 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1747 sdata->control_port_no_encrypt = false; 1748 sdata->control_port_over_nl80211 = false; 1749 sdata->control_port_no_preauth = false; 1750 sdata->vif.cfg.idle = true; 1751 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1752 1753 sdata->noack_map = 0; 1754 1755 /* only monitor/p2p-device differ */ 1756 if (sdata->dev) { 1757 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1758 sdata->dev->type = ARPHRD_ETHER; 1759 } 1760 1761 skb_queue_head_init(&sdata->skb_queue); 1762 skb_queue_head_init(&sdata->status_queue); 1763 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1764 wiphy_work_init(&sdata->activate_links_work, 1765 ieee80211_activate_links_work); 1766 1767 switch (type) { 1768 case NL80211_IFTYPE_P2P_GO: 1769 type = NL80211_IFTYPE_AP; 1770 sdata->vif.type = type; 1771 sdata->vif.p2p = true; 1772 fallthrough; 1773 case NL80211_IFTYPE_AP: 1774 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1775 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1776 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1777 break; 1778 case NL80211_IFTYPE_P2P_CLIENT: 1779 type = NL80211_IFTYPE_STATION; 1780 sdata->vif.type = type; 1781 sdata->vif.p2p = true; 1782 fallthrough; 1783 case NL80211_IFTYPE_STATION: 1784 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1785 ieee80211_sta_setup_sdata(sdata); 1786 break; 1787 case NL80211_IFTYPE_OCB: 1788 sdata->vif.bss_conf.bssid = bssid_wildcard; 1789 ieee80211_ocb_setup_sdata(sdata); 1790 break; 1791 case NL80211_IFTYPE_ADHOC: 1792 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1793 ieee80211_ibss_setup_sdata(sdata); 1794 break; 1795 case NL80211_IFTYPE_MESH_POINT: 1796 if (ieee80211_vif_is_mesh(&sdata->vif)) 1797 ieee80211_mesh_init_sdata(sdata); 1798 break; 1799 case NL80211_IFTYPE_MONITOR: 1800 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1801 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1802 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1803 MONITOR_FLAG_OTHER_BSS; 1804 break; 1805 case NL80211_IFTYPE_NAN: 1806 idr_init(&sdata->u.nan.function_inst_ids); 1807 spin_lock_init(&sdata->u.nan.func_lock); 1808 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1809 break; 1810 case NL80211_IFTYPE_AP_VLAN: 1811 case NL80211_IFTYPE_P2P_DEVICE: 1812 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1813 break; 1814 case NL80211_IFTYPE_UNSPECIFIED: 1815 case NL80211_IFTYPE_WDS: 1816 case NUM_NL80211_IFTYPES: 1817 WARN_ON(1); 1818 break; 1819 } 1820 1821 /* need to do this after the switch so vif.type is correct */ 1822 ieee80211_link_setup(&sdata->deflink); 1823 1824 ieee80211_debugfs_recreate_netdev(sdata, false); 1825 } 1826 1827 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1828 enum nl80211_iftype type) 1829 { 1830 struct ieee80211_local *local = sdata->local; 1831 int ret, err; 1832 enum nl80211_iftype internal_type = type; 1833 bool p2p = false; 1834 1835 ASSERT_RTNL(); 1836 1837 if (!local->ops->change_interface) 1838 return -EBUSY; 1839 1840 /* for now, don't support changing while links exist */ 1841 if (ieee80211_vif_is_mld(&sdata->vif)) 1842 return -EBUSY; 1843 1844 switch (sdata->vif.type) { 1845 case NL80211_IFTYPE_AP: 1846 if (!list_empty(&sdata->u.ap.vlans)) 1847 return -EBUSY; 1848 break; 1849 case NL80211_IFTYPE_STATION: 1850 case NL80211_IFTYPE_ADHOC: 1851 case NL80211_IFTYPE_OCB: 1852 /* 1853 * Could maybe also all others here? 1854 * Just not sure how that interacts 1855 * with the RX/config path e.g. for 1856 * mesh. 1857 */ 1858 break; 1859 default: 1860 return -EBUSY; 1861 } 1862 1863 switch (type) { 1864 case NL80211_IFTYPE_AP: 1865 case NL80211_IFTYPE_STATION: 1866 case NL80211_IFTYPE_ADHOC: 1867 case NL80211_IFTYPE_OCB: 1868 /* 1869 * Could probably support everything 1870 * but here. 1871 */ 1872 break; 1873 case NL80211_IFTYPE_P2P_CLIENT: 1874 p2p = true; 1875 internal_type = NL80211_IFTYPE_STATION; 1876 break; 1877 case NL80211_IFTYPE_P2P_GO: 1878 p2p = true; 1879 internal_type = NL80211_IFTYPE_AP; 1880 break; 1881 default: 1882 return -EBUSY; 1883 } 1884 1885 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1886 if (ret) 1887 return ret; 1888 1889 ieee80211_stop_vif_queues(local, sdata, 1890 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1891 /* do_stop will synchronize_rcu() first thing */ 1892 ieee80211_do_stop(sdata, false); 1893 1894 ieee80211_teardown_sdata(sdata); 1895 1896 ieee80211_set_sdata_offload_flags(sdata); 1897 ret = drv_change_interface(local, sdata, internal_type, p2p); 1898 if (ret) 1899 type = ieee80211_vif_type_p2p(&sdata->vif); 1900 1901 /* 1902 * Ignore return value here, there's not much we can do since 1903 * the driver changed the interface type internally already. 1904 * The warnings will hopefully make driver authors fix it :-) 1905 */ 1906 ieee80211_check_queues(sdata, type); 1907 1908 ieee80211_setup_sdata(sdata, type); 1909 ieee80211_set_vif_encap_ops(sdata); 1910 1911 err = ieee80211_do_open(&sdata->wdev, false); 1912 WARN(err, "type change: do_open returned %d", err); 1913 1914 ieee80211_wake_vif_queues(local, sdata, 1915 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1916 return ret; 1917 } 1918 1919 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1920 enum nl80211_iftype type) 1921 { 1922 int ret; 1923 1924 ASSERT_RTNL(); 1925 1926 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1927 return 0; 1928 1929 if (ieee80211_sdata_running(sdata)) { 1930 ret = ieee80211_runtime_change_iftype(sdata, type); 1931 if (ret) 1932 return ret; 1933 } else { 1934 /* Purge and reset type-dependent state. */ 1935 ieee80211_teardown_sdata(sdata); 1936 ieee80211_setup_sdata(sdata, type); 1937 } 1938 1939 /* reset some values that shouldn't be kept across type changes */ 1940 if (type == NL80211_IFTYPE_STATION) 1941 sdata->u.mgd.use_4addr = false; 1942 1943 return 0; 1944 } 1945 1946 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1947 u8 *perm_addr, enum nl80211_iftype type) 1948 { 1949 struct ieee80211_sub_if_data *sdata; 1950 u64 mask, start, addr, val, inc; 1951 u8 *m; 1952 u8 tmp_addr[ETH_ALEN]; 1953 int i; 1954 1955 lockdep_assert_wiphy(local->hw.wiphy); 1956 1957 /* default ... something at least */ 1958 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1959 1960 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1961 local->hw.wiphy->n_addresses <= 1) 1962 return; 1963 1964 switch (type) { 1965 case NL80211_IFTYPE_MONITOR: 1966 /* doesn't matter */ 1967 break; 1968 case NL80211_IFTYPE_AP_VLAN: 1969 /* match up with an AP interface */ 1970 list_for_each_entry(sdata, &local->interfaces, list) { 1971 if (sdata->vif.type != NL80211_IFTYPE_AP) 1972 continue; 1973 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1974 break; 1975 } 1976 /* keep default if no AP interface present */ 1977 break; 1978 case NL80211_IFTYPE_P2P_CLIENT: 1979 case NL80211_IFTYPE_P2P_GO: 1980 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1981 list_for_each_entry(sdata, &local->interfaces, list) { 1982 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1983 continue; 1984 if (!ieee80211_sdata_running(sdata)) 1985 continue; 1986 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1987 return; 1988 } 1989 } 1990 fallthrough; 1991 default: 1992 /* assign a new address if possible -- try n_addresses first */ 1993 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1994 bool used = false; 1995 1996 list_for_each_entry(sdata, &local->interfaces, list) { 1997 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1998 sdata->vif.addr)) { 1999 used = true; 2000 break; 2001 } 2002 } 2003 2004 if (!used) { 2005 memcpy(perm_addr, 2006 local->hw.wiphy->addresses[i].addr, 2007 ETH_ALEN); 2008 break; 2009 } 2010 } 2011 2012 /* try mask if available */ 2013 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 2014 break; 2015 2016 m = local->hw.wiphy->addr_mask; 2017 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2018 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2019 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2020 2021 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2022 /* not a contiguous mask ... not handled now! */ 2023 pr_info("not contiguous\n"); 2024 break; 2025 } 2026 2027 /* 2028 * Pick address of existing interface in case user changed 2029 * MAC address manually, default to perm_addr. 2030 */ 2031 m = local->hw.wiphy->perm_addr; 2032 list_for_each_entry(sdata, &local->interfaces, list) { 2033 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2034 continue; 2035 m = sdata->vif.addr; 2036 break; 2037 } 2038 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2039 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2040 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2041 2042 inc = 1ULL<<__ffs64(mask); 2043 val = (start & mask); 2044 addr = (start & ~mask) | (val & mask); 2045 do { 2046 bool used = false; 2047 2048 tmp_addr[5] = addr >> 0*8; 2049 tmp_addr[4] = addr >> 1*8; 2050 tmp_addr[3] = addr >> 2*8; 2051 tmp_addr[2] = addr >> 3*8; 2052 tmp_addr[1] = addr >> 4*8; 2053 tmp_addr[0] = addr >> 5*8; 2054 2055 val += inc; 2056 2057 list_for_each_entry(sdata, &local->interfaces, list) { 2058 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2059 used = true; 2060 break; 2061 } 2062 } 2063 2064 if (!used) { 2065 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2066 break; 2067 } 2068 addr = (start & ~mask) | (val & mask); 2069 } while (addr != start); 2070 2071 break; 2072 } 2073 } 2074 2075 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2076 unsigned char name_assign_type, 2077 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2078 struct vif_params *params) 2079 { 2080 struct net_device *ndev = NULL; 2081 struct ieee80211_sub_if_data *sdata = NULL; 2082 struct txq_info *txqi; 2083 int ret, i; 2084 2085 ASSERT_RTNL(); 2086 lockdep_assert_wiphy(local->hw.wiphy); 2087 2088 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2089 struct wireless_dev *wdev; 2090 2091 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2092 GFP_KERNEL); 2093 if (!sdata) 2094 return -ENOMEM; 2095 wdev = &sdata->wdev; 2096 2097 sdata->dev = NULL; 2098 strscpy(sdata->name, name, IFNAMSIZ); 2099 ieee80211_assign_perm_addr(local, wdev->address, type); 2100 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2101 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2102 } else { 2103 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2104 sizeof(void *)); 2105 int txq_size = 0; 2106 2107 if (type != NL80211_IFTYPE_AP_VLAN && 2108 (type != NL80211_IFTYPE_MONITOR || 2109 (params->flags & MONITOR_FLAG_ACTIVE))) 2110 txq_size += sizeof(struct txq_info) + 2111 local->hw.txq_data_size; 2112 2113 ndev = alloc_netdev_mqs(size + txq_size, 2114 name, name_assign_type, 2115 ieee80211_if_setup, 1, 1); 2116 if (!ndev) 2117 return -ENOMEM; 2118 2119 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2120 2121 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2122 2123 ndev->needed_headroom = local->tx_headroom + 2124 4*6 /* four MAC addresses */ 2125 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2126 + 6 /* mesh */ 2127 + 8 /* rfc1042/bridge tunnel */ 2128 - ETH_HLEN /* ethernet hard_header_len */ 2129 + IEEE80211_ENCRYPT_HEADROOM; 2130 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2131 2132 ret = dev_alloc_name(ndev, ndev->name); 2133 if (ret < 0) { 2134 free_netdev(ndev); 2135 return ret; 2136 } 2137 2138 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2139 if (is_valid_ether_addr(params->macaddr)) 2140 eth_hw_addr_set(ndev, params->macaddr); 2141 else 2142 eth_hw_addr_set(ndev, ndev->perm_addr); 2143 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2144 2145 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2146 sdata = netdev_priv(ndev); 2147 ndev->ieee80211_ptr = &sdata->wdev; 2148 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2149 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2150 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2151 2152 if (txq_size) { 2153 txqi = netdev_priv(ndev) + size; 2154 ieee80211_txq_init(sdata, NULL, txqi, 0); 2155 } 2156 2157 sdata->dev = ndev; 2158 } 2159 2160 /* initialise type-independent data */ 2161 sdata->wdev.wiphy = local->hw.wiphy; 2162 2163 ieee80211_sdata_init(local, sdata); 2164 2165 ieee80211_init_frag_cache(&sdata->frags); 2166 2167 INIT_LIST_HEAD(&sdata->key_list); 2168 2169 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2170 ieee80211_delayed_tailroom_dec); 2171 2172 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2173 struct ieee80211_supported_band *sband; 2174 sband = local->hw.wiphy->bands[i]; 2175 sdata->rc_rateidx_mask[i] = 2176 sband ? (1 << sband->n_bitrates) - 1 : 0; 2177 if (sband) { 2178 __le16 cap; 2179 u16 *vht_rate_mask; 2180 2181 memcpy(sdata->rc_rateidx_mcs_mask[i], 2182 sband->ht_cap.mcs.rx_mask, 2183 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2184 2185 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2186 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2187 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2188 } else { 2189 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2190 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2191 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2192 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2193 } 2194 } 2195 2196 ieee80211_set_default_queues(sdata); 2197 2198 /* setup type-dependent data */ 2199 ieee80211_setup_sdata(sdata, type); 2200 2201 if (ndev) { 2202 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2203 if (type == NL80211_IFTYPE_STATION) 2204 sdata->u.mgd.use_4addr = params->use_4addr; 2205 2206 ndev->features |= local->hw.netdev_features; 2207 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2208 ndev->hw_features |= ndev->features & 2209 MAC80211_SUPPORTED_FEATURES_TX; 2210 sdata->vif.netdev_features = local->hw.netdev_features; 2211 2212 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2213 2214 /* MTU range is normally 256 - 2304, where the upper limit is 2215 * the maximum MSDU size. Monitor interfaces send and receive 2216 * MPDU and A-MSDU frames which may be much larger so we do 2217 * not impose an upper limit in that case. 2218 */ 2219 ndev->min_mtu = 256; 2220 if (type == NL80211_IFTYPE_MONITOR) 2221 ndev->max_mtu = 0; 2222 else 2223 ndev->max_mtu = local->hw.max_mtu; 2224 2225 ret = cfg80211_register_netdevice(ndev); 2226 if (ret) { 2227 free_netdev(ndev); 2228 return ret; 2229 } 2230 } 2231 2232 mutex_lock(&local->iflist_mtx); 2233 list_add_tail_rcu(&sdata->list, &local->interfaces); 2234 mutex_unlock(&local->iflist_mtx); 2235 2236 if (new_wdev) 2237 *new_wdev = &sdata->wdev; 2238 2239 return 0; 2240 } 2241 2242 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2243 { 2244 ASSERT_RTNL(); 2245 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2246 2247 mutex_lock(&sdata->local->iflist_mtx); 2248 list_del_rcu(&sdata->list); 2249 mutex_unlock(&sdata->local->iflist_mtx); 2250 2251 if (sdata->vif.txq) 2252 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2253 2254 synchronize_rcu(); 2255 2256 cfg80211_unregister_wdev(&sdata->wdev); 2257 2258 if (!sdata->dev) { 2259 ieee80211_teardown_sdata(sdata); 2260 kfree(sdata); 2261 } 2262 } 2263 2264 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2265 { 2266 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2267 return; 2268 ieee80211_do_stop(sdata, true); 2269 } 2270 2271 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2272 { 2273 struct ieee80211_sub_if_data *sdata, *tmp; 2274 LIST_HEAD(unreg_list); 2275 2276 ASSERT_RTNL(); 2277 2278 /* Before destroying the interfaces, make sure they're all stopped so 2279 * that the hardware is stopped. Otherwise, the driver might still be 2280 * iterating the interfaces during the shutdown, e.g. from a worker 2281 * or from RX processing or similar, and if it does so (using atomic 2282 * iteration) while we're manipulating the list, the iteration will 2283 * crash. 2284 * 2285 * After this, the hardware should be stopped and the driver should 2286 * have stopped all of its activities, so that we can do RCU-unaware 2287 * manipulations of the interface list below. 2288 */ 2289 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2290 2291 guard(wiphy)(local->hw.wiphy); 2292 2293 WARN(local->open_count, "%s: open count remains %d\n", 2294 wiphy_name(local->hw.wiphy), local->open_count); 2295 2296 mutex_lock(&local->iflist_mtx); 2297 list_splice_init(&local->interfaces, &unreg_list); 2298 mutex_unlock(&local->iflist_mtx); 2299 2300 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2301 bool netdev = sdata->dev; 2302 2303 /* 2304 * Remove IP addresses explicitly, since the notifier will 2305 * skip the callbacks if wdev->registered is false, since 2306 * we can't acquire the wiphy_lock() again there if already 2307 * inside this locked section. 2308 */ 2309 sdata->vif.cfg.arp_addr_cnt = 0; 2310 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2311 sdata->u.mgd.associated) 2312 ieee80211_vif_cfg_change_notify(sdata, 2313 BSS_CHANGED_ARP_FILTER); 2314 2315 list_del(&sdata->list); 2316 cfg80211_unregister_wdev(&sdata->wdev); 2317 2318 if (!netdev) 2319 kfree(sdata); 2320 } 2321 } 2322 2323 static int netdev_notify(struct notifier_block *nb, 2324 unsigned long state, void *ptr) 2325 { 2326 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2327 struct ieee80211_sub_if_data *sdata; 2328 2329 if (state != NETDEV_CHANGENAME) 2330 return NOTIFY_DONE; 2331 2332 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2333 return NOTIFY_DONE; 2334 2335 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2336 return NOTIFY_DONE; 2337 2338 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2339 memcpy(sdata->name, dev->name, IFNAMSIZ); 2340 ieee80211_debugfs_rename_netdev(sdata); 2341 2342 return NOTIFY_OK; 2343 } 2344 2345 static struct notifier_block mac80211_netdev_notifier = { 2346 .notifier_call = netdev_notify, 2347 }; 2348 2349 int ieee80211_iface_init(void) 2350 { 2351 return register_netdevice_notifier(&mac80211_netdev_notifier); 2352 } 2353 2354 void ieee80211_iface_exit(void) 2355 { 2356 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2357 } 2358 2359 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2360 { 2361 if (sdata->vif.type == NL80211_IFTYPE_AP) 2362 atomic_inc(&sdata->u.ap.num_mcast_sta); 2363 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2364 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2365 } 2366 2367 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2368 { 2369 if (sdata->vif.type == NL80211_IFTYPE_AP) 2370 atomic_dec(&sdata->u.ap.num_mcast_sta); 2371 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2372 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2373 } 2374 2375 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2376 { 2377 struct ieee80211_local *local = sdata->local; 2378 2379 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2380 return; 2381 2382 ieee80211_stop_vif_queues_norefcount(local, sdata, 2383 IEEE80211_QUEUE_STOP_REASON_CSA); 2384 } 2385 2386 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2387 { 2388 struct ieee80211_local *local = sdata->local; 2389 2390 ieee80211_wake_vif_queues_norefcount(local, sdata, 2391 IEEE80211_QUEUE_STOP_REASON_CSA); 2392 } 2393