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) 2018-2024 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 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 487 break; 488 list_del_rcu(&sdata->u.mntr.list); 489 break; 490 default: 491 break; 492 } 493 494 /* 495 * Remove all stations associated with this interface. 496 * 497 * This must be done before calling ops->remove_interface() 498 * because otherwise we can later invoke ops->sta_notify() 499 * whenever the STAs are removed, and that invalidates driver 500 * assumptions about always getting a vif pointer that is valid 501 * (because if we remove a STA after ops->remove_interface() 502 * the driver will have removed the vif info already!) 503 * 504 * For AP_VLANs stations may exist since there's nothing else that 505 * would have removed them, but in other modes there shouldn't 506 * be any stations. 507 */ 508 flushed = sta_info_flush(sdata, -1); 509 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 510 511 /* don't count this interface for allmulti while it is down */ 512 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 513 atomic_dec(&local->iff_allmultis); 514 515 if (sdata->vif.type == NL80211_IFTYPE_AP) { 516 local->fif_pspoll--; 517 local->fif_probe_req--; 518 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 519 local->fif_probe_req--; 520 } 521 522 if (sdata->dev) { 523 netif_addr_lock_bh(sdata->dev); 524 spin_lock_bh(&local->filter_lock); 525 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 526 sdata->dev->addr_len); 527 spin_unlock_bh(&local->filter_lock); 528 netif_addr_unlock_bh(sdata->dev); 529 } 530 531 del_timer_sync(&local->dynamic_ps_timer); 532 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 533 534 WARN(ieee80211_vif_is_mld(&sdata->vif), 535 "destroying interface with valid links 0x%04x\n", 536 sdata->vif.valid_links); 537 538 sdata->vif.bss_conf.csa_active = false; 539 if (sdata->vif.type == NL80211_IFTYPE_STATION) 540 sdata->deflink.u.mgd.csa.waiting_bcn = false; 541 ieee80211_vif_unblock_queues_csa(sdata); 542 543 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); 544 wiphy_work_cancel(local->hw.wiphy, 545 &sdata->deflink.color_change_finalize_work); 546 wiphy_delayed_work_cancel(local->hw.wiphy, 547 &sdata->deflink.dfs_cac_timer_work); 548 549 if (sdata->wdev.links[0].cac_started) { 550 chandef = sdata->vif.bss_conf.chanreq.oper; 551 WARN_ON(local->suspended); 552 ieee80211_link_release_channel(&sdata->deflink); 553 cfg80211_cac_event(sdata->dev, &chandef, 554 NL80211_RADAR_CAC_ABORTED, 555 GFP_KERNEL, 0); 556 } 557 558 if (sdata->vif.type == NL80211_IFTYPE_AP) { 559 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 560 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 561 /* remove all packets in parent bc_buf pointing to this dev */ 562 ps = &sdata->bss->ps; 563 564 spin_lock_irqsave(&ps->bc_buf.lock, flags); 565 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 566 if (skb->dev == sdata->dev) { 567 __skb_unlink(skb, &ps->bc_buf); 568 local->total_ps_buffered--; 569 ieee80211_free_txskb(&local->hw, skb); 570 } 571 } 572 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 573 } 574 575 if (going_down) 576 local->open_count--; 577 578 switch (sdata->vif.type) { 579 case NL80211_IFTYPE_AP_VLAN: 580 list_del(&sdata->u.vlan.list); 581 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 582 /* see comment in the default case below */ 583 ieee80211_free_keys(sdata, true); 584 /* no need to tell driver */ 585 break; 586 case NL80211_IFTYPE_MONITOR: 587 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 588 local->cooked_mntrs--; 589 break; 590 } 591 592 local->monitors--; 593 if (local->monitors == 0) { 594 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 595 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 596 } 597 598 ieee80211_adjust_monitor_flags(sdata, -1); 599 break; 600 case NL80211_IFTYPE_NAN: 601 /* clean all the functions */ 602 spin_lock_bh(&sdata->u.nan.func_lock); 603 604 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 605 idr_remove(&sdata->u.nan.function_inst_ids, i); 606 cfg80211_free_nan_func(func); 607 } 608 idr_destroy(&sdata->u.nan.function_inst_ids); 609 610 spin_unlock_bh(&sdata->u.nan.func_lock); 611 break; 612 case NL80211_IFTYPE_P2P_DEVICE: 613 /* relies on synchronize_rcu() below */ 614 RCU_INIT_POINTER(local->p2p_sdata, NULL); 615 fallthrough; 616 default: 617 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 618 /* 619 * When we get here, the interface is marked down. 620 * Free the remaining keys, if there are any 621 * (which can happen in AP mode if userspace sets 622 * keys before the interface is operating) 623 * 624 * Force the key freeing to always synchronize_net() 625 * to wait for the RX path in case it is using this 626 * interface enqueuing frames at this very time on 627 * another CPU. 628 */ 629 ieee80211_free_keys(sdata, true); 630 skb_queue_purge(&sdata->skb_queue); 631 skb_queue_purge(&sdata->status_queue); 632 } 633 634 /* 635 * Since ieee80211_free_txskb() may issue __dev_queue_xmit() 636 * which should be called with interrupts enabled, reclamation 637 * is done in two phases: 638 */ 639 __skb_queue_head_init(&freeq); 640 641 /* unlink from local queues... */ 642 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 643 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 644 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 645 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 646 if (info->control.vif == &sdata->vif) { 647 __skb_unlink(skb, &local->pending[i]); 648 __skb_queue_tail(&freeq, skb); 649 } 650 } 651 } 652 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 653 654 /* ... and perform actual reclamation with interrupts enabled. */ 655 skb_queue_walk_safe(&freeq, skb, tmp) { 656 __skb_unlink(skb, &freeq); 657 ieee80211_free_txskb(&local->hw, skb); 658 } 659 660 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 661 ieee80211_txq_remove_vlan(local, sdata); 662 663 sdata->bss = NULL; 664 665 if (local->open_count == 0) 666 ieee80211_clear_tx_pending(local); 667 668 sdata->vif.bss_conf.beacon_int = 0; 669 670 /* 671 * If the interface goes down while suspended, presumably because 672 * the device was unplugged and that happens before our resume, 673 * then the driver is already unconfigured and the remainder of 674 * this function isn't needed. 675 * XXX: what about WoWLAN? If the device has software state, e.g. 676 * memory allocated, it might expect teardown commands from 677 * mac80211 here? 678 */ 679 if (local->suspended) { 680 WARN_ON(local->wowlan); 681 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 682 return; 683 } 684 685 switch (sdata->vif.type) { 686 case NL80211_IFTYPE_AP_VLAN: 687 break; 688 case NL80211_IFTYPE_MONITOR: 689 if (local->monitors == 0) 690 ieee80211_del_virtual_monitor(local); 691 692 ieee80211_recalc_idle(local); 693 ieee80211_recalc_offload(local); 694 695 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 696 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 697 break; 698 699 ieee80211_link_release_channel(&sdata->deflink); 700 fallthrough; 701 default: 702 if (!going_down) 703 break; 704 drv_remove_interface(local, sdata); 705 706 /* Clear private driver data to prevent reuse */ 707 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); 708 } 709 710 ieee80211_recalc_ps(local); 711 712 if (cancel_scan) 713 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 714 715 if (local->open_count == 0) { 716 ieee80211_stop_device(local, false); 717 718 /* no reconfiguring after stop! */ 719 return; 720 } 721 722 /* do after stop to avoid reconfiguring when we stop anyway */ 723 ieee80211_configure_filter(local); 724 ieee80211_hw_config(local, hw_reconf_flags); 725 726 if (local->monitors == local->open_count) 727 ieee80211_add_virtual_monitor(local); 728 } 729 730 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 731 { 732 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 733 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 734 735 if (!tx_vif) 736 return; 737 738 tx_sdata = vif_to_sdata(tx_vif); 739 sdata->vif.mbssid_tx_vif = NULL; 740 741 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 742 &tx_sdata->local->interfaces, list) { 743 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 744 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 745 ieee80211_sdata_running(non_tx_sdata)) { 746 non_tx_sdata->vif.mbssid_tx_vif = NULL; 747 dev_close(non_tx_sdata->wdev.netdev); 748 } 749 } 750 751 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 752 tx_sdata->vif.mbssid_tx_vif = NULL; 753 dev_close(tx_sdata->wdev.netdev); 754 } 755 } 756 757 static int ieee80211_stop(struct net_device *dev) 758 { 759 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 760 761 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 762 if (sdata->vif.type == NL80211_IFTYPE_AP) { 763 struct ieee80211_sub_if_data *vlan, *tmpsdata; 764 765 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 766 u.vlan.list) 767 dev_close(vlan->dev); 768 769 ieee80211_stop_mbssid(sdata); 770 } 771 772 guard(wiphy)(sdata->local->hw.wiphy); 773 774 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 775 776 ieee80211_do_stop(sdata, true); 777 778 return 0; 779 } 780 781 static void ieee80211_set_multicast_list(struct net_device *dev) 782 { 783 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 784 struct ieee80211_local *local = sdata->local; 785 int allmulti, sdata_allmulti; 786 787 allmulti = !!(dev->flags & IFF_ALLMULTI); 788 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 789 790 if (allmulti != sdata_allmulti) { 791 if (dev->flags & IFF_ALLMULTI) 792 atomic_inc(&local->iff_allmultis); 793 else 794 atomic_dec(&local->iff_allmultis); 795 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 796 } 797 798 spin_lock_bh(&local->filter_lock); 799 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 800 spin_unlock_bh(&local->filter_lock); 801 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 802 } 803 804 /* 805 * Called when the netdev is removed or, by the code below, before 806 * the interface type changes. 807 */ 808 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 809 { 810 /* free extra data */ 811 ieee80211_free_keys(sdata, false); 812 813 ieee80211_debugfs_remove_netdev(sdata); 814 815 ieee80211_destroy_frag_cache(&sdata->frags); 816 817 if (ieee80211_vif_is_mesh(&sdata->vif)) 818 ieee80211_mesh_teardown_sdata(sdata); 819 820 ieee80211_vif_clear_links(sdata); 821 ieee80211_link_stop(&sdata->deflink); 822 } 823 824 static void ieee80211_uninit(struct net_device *dev) 825 { 826 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 827 } 828 829 static int ieee80211_netdev_setup_tc(struct net_device *dev, 830 enum tc_setup_type type, void *type_data) 831 { 832 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 833 struct ieee80211_local *local = sdata->local; 834 835 return drv_net_setup_tc(local, sdata, dev, type, type_data); 836 } 837 838 static const struct net_device_ops ieee80211_dataif_ops = { 839 .ndo_open = ieee80211_open, 840 .ndo_stop = ieee80211_stop, 841 .ndo_uninit = ieee80211_uninit, 842 .ndo_start_xmit = ieee80211_subif_start_xmit, 843 .ndo_set_rx_mode = ieee80211_set_multicast_list, 844 .ndo_set_mac_address = ieee80211_change_mac, 845 .ndo_setup_tc = ieee80211_netdev_setup_tc, 846 }; 847 848 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 849 struct sk_buff *skb, 850 struct net_device *sb_dev) 851 { 852 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 853 struct ieee80211_local *local = sdata->local; 854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 855 struct ieee80211_hdr *hdr; 856 int len_rthdr; 857 858 if (local->hw.queues < IEEE80211_NUM_ACS) 859 return 0; 860 861 /* reset flags and info before parsing radiotap header */ 862 memset(info, 0, sizeof(*info)); 863 864 if (!ieee80211_parse_tx_radiotap(skb, dev)) 865 return 0; /* doesn't matter, frame will be dropped */ 866 867 len_rthdr = ieee80211_get_radiotap_len(skb->data); 868 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 869 if (skb->len < len_rthdr + 2 || 870 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 871 return 0; /* doesn't matter, frame will be dropped */ 872 873 return ieee80211_select_queue_80211(sdata, skb, hdr); 874 } 875 876 static const struct net_device_ops ieee80211_monitorif_ops = { 877 .ndo_open = ieee80211_open, 878 .ndo_stop = ieee80211_stop, 879 .ndo_uninit = ieee80211_uninit, 880 .ndo_start_xmit = ieee80211_monitor_start_xmit, 881 .ndo_set_rx_mode = ieee80211_set_multicast_list, 882 .ndo_set_mac_address = ieee80211_change_mac, 883 .ndo_select_queue = ieee80211_monitor_select_queue, 884 }; 885 886 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 887 struct net_device_path *path) 888 { 889 struct ieee80211_sub_if_data *sdata; 890 struct ieee80211_local *local; 891 struct sta_info *sta; 892 int ret = -ENOENT; 893 894 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 895 local = sdata->local; 896 897 if (!local->ops->net_fill_forward_path) 898 return -EOPNOTSUPP; 899 900 rcu_read_lock(); 901 switch (sdata->vif.type) { 902 case NL80211_IFTYPE_AP_VLAN: 903 sta = rcu_dereference(sdata->u.vlan.sta); 904 if (sta) 905 break; 906 if (sdata->wdev.use_4addr) 907 goto out; 908 if (is_multicast_ether_addr(ctx->daddr)) 909 goto out; 910 sta = sta_info_get_bss(sdata, ctx->daddr); 911 break; 912 case NL80211_IFTYPE_AP: 913 if (is_multicast_ether_addr(ctx->daddr)) 914 goto out; 915 sta = sta_info_get(sdata, ctx->daddr); 916 break; 917 case NL80211_IFTYPE_STATION: 918 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 919 sta = sta_info_get(sdata, ctx->daddr); 920 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 921 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 922 goto out; 923 924 break; 925 } 926 } 927 928 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 929 break; 930 default: 931 goto out; 932 } 933 934 if (!sta) 935 goto out; 936 937 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 938 out: 939 rcu_read_unlock(); 940 941 return ret; 942 } 943 944 static const struct net_device_ops ieee80211_dataif_8023_ops = { 945 .ndo_open = ieee80211_open, 946 .ndo_stop = ieee80211_stop, 947 .ndo_uninit = ieee80211_uninit, 948 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 949 .ndo_set_rx_mode = ieee80211_set_multicast_list, 950 .ndo_set_mac_address = ieee80211_change_mac, 951 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 952 .ndo_setup_tc = ieee80211_netdev_setup_tc, 953 }; 954 955 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 956 { 957 switch (iftype) { 958 /* P2P GO and client are mapped to AP/STATION types */ 959 case NL80211_IFTYPE_AP: 960 case NL80211_IFTYPE_STATION: 961 return true; 962 default: 963 return false; 964 } 965 } 966 967 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 968 { 969 struct ieee80211_local *local = sdata->local; 970 u32 flags; 971 972 flags = sdata->vif.offload_flags; 973 974 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 975 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 976 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 977 978 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 979 local->hw.wiphy->frag_threshold != (u32)-1) 980 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 981 982 if (local->monitors) 983 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 984 } else { 985 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 986 } 987 988 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 989 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 990 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 991 992 if (local->monitors && 993 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 994 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 995 } else { 996 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 997 } 998 999 if (sdata->vif.offload_flags == flags) 1000 return false; 1001 1002 sdata->vif.offload_flags = flags; 1003 ieee80211_check_fast_rx_iface(sdata); 1004 return true; 1005 } 1006 1007 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1008 { 1009 struct ieee80211_local *local = sdata->local; 1010 struct ieee80211_sub_if_data *bss = sdata; 1011 bool enabled; 1012 1013 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1014 if (!sdata->bss) 1015 return; 1016 1017 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1018 } 1019 1020 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1021 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1022 return; 1023 1024 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1025 if (sdata->wdev.use_4addr && 1026 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1027 enabled = false; 1028 1029 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1030 &ieee80211_dataif_ops; 1031 } 1032 1033 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1034 { 1035 struct ieee80211_local *local = sdata->local; 1036 struct ieee80211_sub_if_data *vsdata; 1037 1038 if (ieee80211_set_sdata_offload_flags(sdata)) { 1039 drv_update_vif_offload(local, sdata); 1040 ieee80211_set_vif_encap_ops(sdata); 1041 } 1042 1043 list_for_each_entry(vsdata, &local->interfaces, list) { 1044 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1045 vsdata->bss != &sdata->u.ap) 1046 continue; 1047 1048 ieee80211_set_vif_encap_ops(vsdata); 1049 } 1050 } 1051 1052 void ieee80211_recalc_offload(struct ieee80211_local *local) 1053 { 1054 struct ieee80211_sub_if_data *sdata; 1055 1056 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1057 return; 1058 1059 lockdep_assert_wiphy(local->hw.wiphy); 1060 1061 list_for_each_entry(sdata, &local->interfaces, list) { 1062 if (!ieee80211_sdata_running(sdata)) 1063 continue; 1064 1065 ieee80211_recalc_sdata_offload(sdata); 1066 } 1067 } 1068 1069 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1070 const int offset) 1071 { 1072 struct ieee80211_local *local = sdata->local; 1073 u32 flags = sdata->u.mntr.flags; 1074 1075 #define ADJUST(_f, _s) do { \ 1076 if (flags & MONITOR_FLAG_##_f) \ 1077 local->fif_##_s += offset; \ 1078 } while (0) 1079 1080 ADJUST(FCSFAIL, fcsfail); 1081 ADJUST(PLCPFAIL, plcpfail); 1082 ADJUST(CONTROL, control); 1083 ADJUST(CONTROL, pspoll); 1084 ADJUST(OTHER_BSS, other_bss); 1085 if (!(flags & MONITOR_FLAG_SKIP_TX)) 1086 local->tx_mntrs += offset; 1087 1088 #undef ADJUST 1089 } 1090 1091 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1092 { 1093 struct ieee80211_local *local = sdata->local; 1094 int i; 1095 1096 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1097 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1098 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1099 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1100 sdata->vif.hw_queue[i] = i; 1101 else 1102 sdata->vif.hw_queue[i] = 0; 1103 } 1104 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1105 } 1106 1107 static void ieee80211_sdata_init(struct ieee80211_local *local, 1108 struct ieee80211_sub_if_data *sdata) 1109 { 1110 sdata->local = local; 1111 1112 /* 1113 * Initialize the default link, so we can use link_id 0 for non-MLD, 1114 * and that continues to work for non-MLD-aware drivers that use just 1115 * vif.bss_conf instead of vif.link_conf. 1116 * 1117 * Note that we never change this, so if link ID 0 isn't used in an 1118 * MLD connection, we get a separate allocation for it. 1119 */ 1120 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1121 } 1122 1123 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1124 { 1125 struct ieee80211_sub_if_data *sdata; 1126 int ret; 1127 1128 ASSERT_RTNL(); 1129 lockdep_assert_wiphy(local->hw.wiphy); 1130 1131 if (local->monitor_sdata || 1132 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1133 return 0; 1134 1135 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1136 if (!sdata) 1137 return -ENOMEM; 1138 1139 /* set up data */ 1140 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1141 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1142 wiphy_name(local->hw.wiphy)); 1143 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1144 sdata->wdev.wiphy = local->hw.wiphy; 1145 1146 ieee80211_sdata_init(local, sdata); 1147 1148 ieee80211_set_default_queues(sdata); 1149 1150 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1151 ret = drv_add_interface(local, sdata); 1152 if (WARN_ON(ret)) { 1153 /* ok .. stupid driver, it asked for this! */ 1154 kfree(sdata); 1155 return ret; 1156 } 1157 } 1158 1159 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1160 1161 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1162 if (ret) { 1163 kfree(sdata); 1164 return ret; 1165 } 1166 1167 mutex_lock(&local->iflist_mtx); 1168 rcu_assign_pointer(local->monitor_sdata, sdata); 1169 mutex_unlock(&local->iflist_mtx); 1170 1171 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1172 IEEE80211_CHANCTX_EXCLUSIVE); 1173 if (ret) { 1174 mutex_lock(&local->iflist_mtx); 1175 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1176 mutex_unlock(&local->iflist_mtx); 1177 synchronize_net(); 1178 drv_remove_interface(local, sdata); 1179 kfree(sdata); 1180 return ret; 1181 } 1182 1183 skb_queue_head_init(&sdata->skb_queue); 1184 skb_queue_head_init(&sdata->status_queue); 1185 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1186 1187 return 0; 1188 } 1189 1190 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1191 { 1192 struct ieee80211_sub_if_data *sdata; 1193 1194 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1195 return; 1196 1197 ASSERT_RTNL(); 1198 lockdep_assert_wiphy(local->hw.wiphy); 1199 1200 mutex_lock(&local->iflist_mtx); 1201 1202 sdata = rcu_dereference_protected(local->monitor_sdata, 1203 lockdep_is_held(&local->iflist_mtx)); 1204 if (!sdata) { 1205 mutex_unlock(&local->iflist_mtx); 1206 return; 1207 } 1208 1209 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1210 mutex_unlock(&local->iflist_mtx); 1211 1212 synchronize_net(); 1213 1214 ieee80211_link_release_channel(&sdata->deflink); 1215 1216 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1217 drv_remove_interface(local, sdata); 1218 1219 kfree(sdata); 1220 } 1221 1222 /* 1223 * NOTE: Be very careful when changing this function, it must NOT return 1224 * an error on interface type changes that have been pre-checked, so most 1225 * checks should be in ieee80211_check_concurrent_iface. 1226 */ 1227 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1228 { 1229 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1230 struct net_device *dev = wdev->netdev; 1231 struct ieee80211_local *local = sdata->local; 1232 u64 changed = 0; 1233 int res; 1234 u32 hw_reconf_flags = 0; 1235 1236 lockdep_assert_wiphy(local->hw.wiphy); 1237 1238 switch (sdata->vif.type) { 1239 case NL80211_IFTYPE_AP_VLAN: { 1240 struct ieee80211_sub_if_data *master; 1241 1242 if (!sdata->bss) 1243 return -ENOLINK; 1244 1245 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1246 1247 master = container_of(sdata->bss, 1248 struct ieee80211_sub_if_data, u.ap); 1249 sdata->control_port_protocol = 1250 master->control_port_protocol; 1251 sdata->control_port_no_encrypt = 1252 master->control_port_no_encrypt; 1253 sdata->control_port_over_nl80211 = 1254 master->control_port_over_nl80211; 1255 sdata->control_port_no_preauth = 1256 master->control_port_no_preauth; 1257 sdata->vif.cab_queue = master->vif.cab_queue; 1258 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1259 sizeof(sdata->vif.hw_queue)); 1260 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1261 1262 sdata->crypto_tx_tailroom_needed_cnt += 1263 master->crypto_tx_tailroom_needed_cnt; 1264 1265 break; 1266 } 1267 case NL80211_IFTYPE_AP: 1268 sdata->bss = &sdata->u.ap; 1269 break; 1270 case NL80211_IFTYPE_MESH_POINT: 1271 case NL80211_IFTYPE_STATION: 1272 case NL80211_IFTYPE_MONITOR: 1273 case NL80211_IFTYPE_ADHOC: 1274 case NL80211_IFTYPE_P2P_DEVICE: 1275 case NL80211_IFTYPE_OCB: 1276 case NL80211_IFTYPE_NAN: 1277 /* no special treatment */ 1278 break; 1279 case NL80211_IFTYPE_UNSPECIFIED: 1280 case NUM_NL80211_IFTYPES: 1281 case NL80211_IFTYPE_P2P_CLIENT: 1282 case NL80211_IFTYPE_P2P_GO: 1283 case NL80211_IFTYPE_WDS: 1284 /* cannot happen */ 1285 WARN_ON(1); 1286 break; 1287 } 1288 1289 if (local->open_count == 0) { 1290 /* here we can consider everything in good order (again) */ 1291 local->reconfig_failure = false; 1292 1293 res = drv_start(local); 1294 if (res) 1295 goto err_del_bss; 1296 ieee80211_led_radio(local, true); 1297 ieee80211_mod_tpt_led_trig(local, 1298 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1299 } 1300 1301 /* 1302 * Copy the hopefully now-present MAC address to 1303 * this interface, if it has the special null one. 1304 */ 1305 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1306 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1307 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1308 1309 if (!is_valid_ether_addr(dev->dev_addr)) { 1310 res = -EADDRNOTAVAIL; 1311 goto err_stop; 1312 } 1313 } 1314 1315 sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR || 1316 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE); 1317 switch (sdata->vif.type) { 1318 case NL80211_IFTYPE_AP_VLAN: 1319 /* no need to tell driver, but set carrier and chanctx */ 1320 if (sdata->bss->active) { 1321 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1322 netif_carrier_on(dev); 1323 ieee80211_set_vif_encap_ops(sdata); 1324 } else { 1325 netif_carrier_off(dev); 1326 } 1327 break; 1328 case NL80211_IFTYPE_MONITOR: 1329 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1330 local->cooked_mntrs++; 1331 break; 1332 } 1333 1334 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1335 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1336 res = drv_add_interface(local, sdata); 1337 if (res) 1338 goto err_stop; 1339 } else if (local->monitors == 0 && local->open_count == 0) { 1340 res = ieee80211_add_virtual_monitor(local); 1341 if (res) 1342 goto err_stop; 1343 } 1344 1345 /* must be before the call to ieee80211_configure_filter */ 1346 local->monitors++; 1347 if (local->monitors == 1) { 1348 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1349 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1350 } 1351 1352 ieee80211_adjust_monitor_flags(sdata, 1); 1353 ieee80211_configure_filter(local); 1354 ieee80211_recalc_offload(local); 1355 ieee80211_recalc_idle(local); 1356 1357 netif_carrier_on(dev); 1358 break; 1359 default: 1360 if (coming_up) { 1361 ieee80211_del_virtual_monitor(local); 1362 ieee80211_set_sdata_offload_flags(sdata); 1363 1364 res = drv_add_interface(local, sdata); 1365 if (res) 1366 goto err_stop; 1367 1368 ieee80211_set_vif_encap_ops(sdata); 1369 res = ieee80211_check_queues(sdata, 1370 ieee80211_vif_type_p2p(&sdata->vif)); 1371 if (res) 1372 goto err_del_interface; 1373 } 1374 1375 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1376 local->fif_pspoll++; 1377 local->fif_probe_req++; 1378 1379 ieee80211_configure_filter(local); 1380 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1381 local->fif_probe_req++; 1382 } 1383 1384 if (sdata->vif.probe_req_reg) 1385 drv_config_iface_filter(local, sdata, 1386 FIF_PROBE_REQ, 1387 FIF_PROBE_REQ); 1388 1389 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1390 sdata->vif.type != NL80211_IFTYPE_NAN) 1391 changed |= ieee80211_reset_erp_info(sdata); 1392 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1393 changed); 1394 1395 switch (sdata->vif.type) { 1396 case NL80211_IFTYPE_STATION: 1397 case NL80211_IFTYPE_ADHOC: 1398 case NL80211_IFTYPE_AP: 1399 case NL80211_IFTYPE_MESH_POINT: 1400 case NL80211_IFTYPE_OCB: 1401 netif_carrier_off(dev); 1402 break; 1403 case NL80211_IFTYPE_P2P_DEVICE: 1404 case NL80211_IFTYPE_NAN: 1405 break; 1406 default: 1407 /* not reached */ 1408 WARN_ON(1); 1409 } 1410 1411 /* 1412 * Set default queue parameters so drivers don't 1413 * need to initialise the hardware if the hardware 1414 * doesn't start up with sane defaults. 1415 * Enable QoS for anything but station interfaces. 1416 */ 1417 ieee80211_set_wmm_default(&sdata->deflink, true, 1418 sdata->vif.type != NL80211_IFTYPE_STATION); 1419 } 1420 1421 switch (sdata->vif.type) { 1422 case NL80211_IFTYPE_P2P_DEVICE: 1423 rcu_assign_pointer(local->p2p_sdata, sdata); 1424 break; 1425 case NL80211_IFTYPE_MONITOR: 1426 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1427 break; 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 default: 1564 break; 1565 } 1566 } 1567 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1568 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1569 ieee80211_sta_rx_queued_ext(sdata, skb); 1570 else 1571 WARN_ON(1); 1572 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1573 struct ieee80211_hdr *hdr = (void *)mgmt; 1574 struct sta_info *sta; 1575 1576 /* 1577 * So the frame isn't mgmt, but frame_control 1578 * is at the right place anyway, of course, so 1579 * the if statement is correct. 1580 * 1581 * Warn if we have other data frame types here, 1582 * they must not get here. 1583 */ 1584 WARN_ON(hdr->frame_control & 1585 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1586 WARN_ON(!(hdr->seq_ctrl & 1587 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1588 /* 1589 * This was a fragment of a frame, received while 1590 * a block-ack session was active. That cannot be 1591 * right, so terminate the session. 1592 */ 1593 sta = sta_info_get_bss(sdata, mgmt->sa); 1594 if (sta) { 1595 u16 tid = ieee80211_get_tid(hdr); 1596 1597 __ieee80211_stop_rx_ba_session( 1598 sta, tid, WLAN_BACK_RECIPIENT, 1599 WLAN_REASON_QSTA_REQUIRE_SETUP, 1600 true); 1601 } 1602 } else switch (sdata->vif.type) { 1603 case NL80211_IFTYPE_STATION: 1604 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1605 break; 1606 case NL80211_IFTYPE_ADHOC: 1607 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1608 break; 1609 case NL80211_IFTYPE_MESH_POINT: 1610 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1611 break; 1612 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1613 break; 1614 default: 1615 WARN(1, "frame for unexpected interface type"); 1616 break; 1617 } 1618 } 1619 1620 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1621 struct sk_buff *skb) 1622 { 1623 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1624 1625 if (ieee80211_is_action(mgmt->frame_control) && 1626 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1627 switch (mgmt->u.action.u.s1g.action_code) { 1628 case WLAN_S1G_TWT_TEARDOWN: 1629 case WLAN_S1G_TWT_SETUP: 1630 ieee80211_s1g_status_twt_action(sdata, skb); 1631 break; 1632 default: 1633 break; 1634 } 1635 } 1636 } 1637 1638 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1639 { 1640 struct ieee80211_sub_if_data *sdata = 1641 container_of(work, struct ieee80211_sub_if_data, work); 1642 struct ieee80211_local *local = sdata->local; 1643 struct sk_buff *skb; 1644 1645 if (!ieee80211_sdata_running(sdata)) 1646 return; 1647 1648 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1649 return; 1650 1651 if (!ieee80211_can_run_worker(local)) 1652 return; 1653 1654 /* first process frames */ 1655 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1656 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1657 1658 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1659 ieee80211_process_tdls_channel_switch(sdata, skb); 1660 else 1661 ieee80211_iface_process_skb(local, sdata, skb); 1662 1663 kfree_skb(skb); 1664 kcov_remote_stop(); 1665 } 1666 1667 /* process status queue */ 1668 while ((skb = skb_dequeue(&sdata->status_queue))) { 1669 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1670 1671 ieee80211_iface_process_status(sdata, skb); 1672 kfree_skb(skb); 1673 1674 kcov_remote_stop(); 1675 } 1676 1677 /* then other type-dependent work */ 1678 switch (sdata->vif.type) { 1679 case NL80211_IFTYPE_STATION: 1680 ieee80211_sta_work(sdata); 1681 break; 1682 case NL80211_IFTYPE_ADHOC: 1683 ieee80211_ibss_work(sdata); 1684 break; 1685 case NL80211_IFTYPE_MESH_POINT: 1686 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1687 break; 1688 ieee80211_mesh_work(sdata); 1689 break; 1690 case NL80211_IFTYPE_OCB: 1691 ieee80211_ocb_work(sdata); 1692 break; 1693 default: 1694 break; 1695 } 1696 } 1697 1698 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1699 struct wiphy_work *work) 1700 { 1701 struct ieee80211_sub_if_data *sdata = 1702 container_of(work, struct ieee80211_sub_if_data, 1703 activate_links_work); 1704 struct ieee80211_local *local = wiphy_priv(wiphy); 1705 1706 if (local->in_reconfig) 1707 return; 1708 1709 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1710 sdata->desired_active_links = 0; 1711 } 1712 1713 /* 1714 * Helper function to initialise an interface to a specific type. 1715 */ 1716 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1717 enum nl80211_iftype type) 1718 { 1719 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1720 0xff, 0xff, 0xff}; 1721 1722 /* clear type-dependent unions */ 1723 memset(&sdata->u, 0, sizeof(sdata->u)); 1724 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1725 1726 /* and set some type-dependent values */ 1727 sdata->vif.type = type; 1728 sdata->vif.p2p = false; 1729 sdata->wdev.iftype = type; 1730 1731 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1732 sdata->control_port_no_encrypt = false; 1733 sdata->control_port_over_nl80211 = false; 1734 sdata->control_port_no_preauth = false; 1735 sdata->vif.cfg.idle = true; 1736 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1737 1738 sdata->noack_map = 0; 1739 1740 /* only monitor/p2p-device differ */ 1741 if (sdata->dev) { 1742 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1743 sdata->dev->type = ARPHRD_ETHER; 1744 } 1745 1746 skb_queue_head_init(&sdata->skb_queue); 1747 skb_queue_head_init(&sdata->status_queue); 1748 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1749 wiphy_work_init(&sdata->activate_links_work, 1750 ieee80211_activate_links_work); 1751 1752 switch (type) { 1753 case NL80211_IFTYPE_P2P_GO: 1754 type = NL80211_IFTYPE_AP; 1755 sdata->vif.type = type; 1756 sdata->vif.p2p = true; 1757 fallthrough; 1758 case NL80211_IFTYPE_AP: 1759 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1760 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1761 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1762 break; 1763 case NL80211_IFTYPE_P2P_CLIENT: 1764 type = NL80211_IFTYPE_STATION; 1765 sdata->vif.type = type; 1766 sdata->vif.p2p = true; 1767 fallthrough; 1768 case NL80211_IFTYPE_STATION: 1769 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1770 ieee80211_sta_setup_sdata(sdata); 1771 break; 1772 case NL80211_IFTYPE_OCB: 1773 sdata->vif.bss_conf.bssid = bssid_wildcard; 1774 ieee80211_ocb_setup_sdata(sdata); 1775 break; 1776 case NL80211_IFTYPE_ADHOC: 1777 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1778 ieee80211_ibss_setup_sdata(sdata); 1779 break; 1780 case NL80211_IFTYPE_MESH_POINT: 1781 if (ieee80211_vif_is_mesh(&sdata->vif)) 1782 ieee80211_mesh_init_sdata(sdata); 1783 break; 1784 case NL80211_IFTYPE_MONITOR: 1785 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1786 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1787 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1788 MONITOR_FLAG_OTHER_BSS; 1789 break; 1790 case NL80211_IFTYPE_NAN: 1791 idr_init(&sdata->u.nan.function_inst_ids); 1792 spin_lock_init(&sdata->u.nan.func_lock); 1793 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1794 break; 1795 case NL80211_IFTYPE_AP_VLAN: 1796 case NL80211_IFTYPE_P2P_DEVICE: 1797 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1798 break; 1799 case NL80211_IFTYPE_UNSPECIFIED: 1800 case NL80211_IFTYPE_WDS: 1801 case NUM_NL80211_IFTYPES: 1802 WARN_ON(1); 1803 break; 1804 } 1805 1806 /* need to do this after the switch so vif.type is correct */ 1807 ieee80211_link_setup(&sdata->deflink); 1808 1809 ieee80211_debugfs_recreate_netdev(sdata, false); 1810 } 1811 1812 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1813 enum nl80211_iftype type) 1814 { 1815 struct ieee80211_local *local = sdata->local; 1816 int ret, err; 1817 enum nl80211_iftype internal_type = type; 1818 bool p2p = false; 1819 1820 ASSERT_RTNL(); 1821 1822 if (!local->ops->change_interface) 1823 return -EBUSY; 1824 1825 /* for now, don't support changing while links exist */ 1826 if (ieee80211_vif_is_mld(&sdata->vif)) 1827 return -EBUSY; 1828 1829 switch (sdata->vif.type) { 1830 case NL80211_IFTYPE_AP: 1831 if (!list_empty(&sdata->u.ap.vlans)) 1832 return -EBUSY; 1833 break; 1834 case NL80211_IFTYPE_STATION: 1835 case NL80211_IFTYPE_ADHOC: 1836 case NL80211_IFTYPE_OCB: 1837 /* 1838 * Could maybe also all others here? 1839 * Just not sure how that interacts 1840 * with the RX/config path e.g. for 1841 * mesh. 1842 */ 1843 break; 1844 default: 1845 return -EBUSY; 1846 } 1847 1848 switch (type) { 1849 case NL80211_IFTYPE_AP: 1850 case NL80211_IFTYPE_STATION: 1851 case NL80211_IFTYPE_ADHOC: 1852 case NL80211_IFTYPE_OCB: 1853 /* 1854 * Could probably support everything 1855 * but here. 1856 */ 1857 break; 1858 case NL80211_IFTYPE_P2P_CLIENT: 1859 p2p = true; 1860 internal_type = NL80211_IFTYPE_STATION; 1861 break; 1862 case NL80211_IFTYPE_P2P_GO: 1863 p2p = true; 1864 internal_type = NL80211_IFTYPE_AP; 1865 break; 1866 default: 1867 return -EBUSY; 1868 } 1869 1870 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1871 if (ret) 1872 return ret; 1873 1874 ieee80211_stop_vif_queues(local, sdata, 1875 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1876 /* do_stop will synchronize_rcu() first thing */ 1877 ieee80211_do_stop(sdata, false); 1878 1879 ieee80211_teardown_sdata(sdata); 1880 1881 ieee80211_set_sdata_offload_flags(sdata); 1882 ret = drv_change_interface(local, sdata, internal_type, p2p); 1883 if (ret) 1884 type = ieee80211_vif_type_p2p(&sdata->vif); 1885 1886 /* 1887 * Ignore return value here, there's not much we can do since 1888 * the driver changed the interface type internally already. 1889 * The warnings will hopefully make driver authors fix it :-) 1890 */ 1891 ieee80211_check_queues(sdata, type); 1892 1893 ieee80211_setup_sdata(sdata, type); 1894 ieee80211_set_vif_encap_ops(sdata); 1895 1896 err = ieee80211_do_open(&sdata->wdev, false); 1897 WARN(err, "type change: do_open returned %d", err); 1898 1899 ieee80211_wake_vif_queues(local, sdata, 1900 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1901 return ret; 1902 } 1903 1904 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1905 enum nl80211_iftype type) 1906 { 1907 int ret; 1908 1909 ASSERT_RTNL(); 1910 1911 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1912 return 0; 1913 1914 if (ieee80211_sdata_running(sdata)) { 1915 ret = ieee80211_runtime_change_iftype(sdata, type); 1916 if (ret) 1917 return ret; 1918 } else { 1919 /* Purge and reset type-dependent state. */ 1920 ieee80211_teardown_sdata(sdata); 1921 ieee80211_setup_sdata(sdata, type); 1922 } 1923 1924 /* reset some values that shouldn't be kept across type changes */ 1925 if (type == NL80211_IFTYPE_STATION) 1926 sdata->u.mgd.use_4addr = false; 1927 1928 return 0; 1929 } 1930 1931 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1932 u8 *perm_addr, enum nl80211_iftype type) 1933 { 1934 struct ieee80211_sub_if_data *sdata; 1935 u64 mask, start, addr, val, inc; 1936 u8 *m; 1937 u8 tmp_addr[ETH_ALEN]; 1938 int i; 1939 1940 lockdep_assert_wiphy(local->hw.wiphy); 1941 1942 /* default ... something at least */ 1943 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1944 1945 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1946 local->hw.wiphy->n_addresses <= 1) 1947 return; 1948 1949 switch (type) { 1950 case NL80211_IFTYPE_MONITOR: 1951 /* doesn't matter */ 1952 break; 1953 case NL80211_IFTYPE_AP_VLAN: 1954 /* match up with an AP interface */ 1955 list_for_each_entry(sdata, &local->interfaces, list) { 1956 if (sdata->vif.type != NL80211_IFTYPE_AP) 1957 continue; 1958 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1959 break; 1960 } 1961 /* keep default if no AP interface present */ 1962 break; 1963 case NL80211_IFTYPE_P2P_CLIENT: 1964 case NL80211_IFTYPE_P2P_GO: 1965 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1966 list_for_each_entry(sdata, &local->interfaces, list) { 1967 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1968 continue; 1969 if (!ieee80211_sdata_running(sdata)) 1970 continue; 1971 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1972 return; 1973 } 1974 } 1975 fallthrough; 1976 default: 1977 /* assign a new address if possible -- try n_addresses first */ 1978 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1979 bool used = false; 1980 1981 list_for_each_entry(sdata, &local->interfaces, list) { 1982 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1983 sdata->vif.addr)) { 1984 used = true; 1985 break; 1986 } 1987 } 1988 1989 if (!used) { 1990 memcpy(perm_addr, 1991 local->hw.wiphy->addresses[i].addr, 1992 ETH_ALEN); 1993 break; 1994 } 1995 } 1996 1997 /* try mask if available */ 1998 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1999 break; 2000 2001 m = local->hw.wiphy->addr_mask; 2002 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2003 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2004 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2005 2006 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2007 /* not a contiguous mask ... not handled now! */ 2008 pr_info("not contiguous\n"); 2009 break; 2010 } 2011 2012 /* 2013 * Pick address of existing interface in case user changed 2014 * MAC address manually, default to perm_addr. 2015 */ 2016 m = local->hw.wiphy->perm_addr; 2017 list_for_each_entry(sdata, &local->interfaces, list) { 2018 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2019 continue; 2020 m = sdata->vif.addr; 2021 break; 2022 } 2023 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2024 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2025 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2026 2027 inc = 1ULL<<__ffs64(mask); 2028 val = (start & mask); 2029 addr = (start & ~mask) | (val & mask); 2030 do { 2031 bool used = false; 2032 2033 tmp_addr[5] = addr >> 0*8; 2034 tmp_addr[4] = addr >> 1*8; 2035 tmp_addr[3] = addr >> 2*8; 2036 tmp_addr[2] = addr >> 3*8; 2037 tmp_addr[1] = addr >> 4*8; 2038 tmp_addr[0] = addr >> 5*8; 2039 2040 val += inc; 2041 2042 list_for_each_entry(sdata, &local->interfaces, list) { 2043 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2044 used = true; 2045 break; 2046 } 2047 } 2048 2049 if (!used) { 2050 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2051 break; 2052 } 2053 addr = (start & ~mask) | (val & mask); 2054 } while (addr != start); 2055 2056 break; 2057 } 2058 } 2059 2060 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2061 unsigned char name_assign_type, 2062 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2063 struct vif_params *params) 2064 { 2065 struct net_device *ndev = NULL; 2066 struct ieee80211_sub_if_data *sdata = NULL; 2067 struct txq_info *txqi; 2068 int ret, i; 2069 2070 ASSERT_RTNL(); 2071 lockdep_assert_wiphy(local->hw.wiphy); 2072 2073 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2074 struct wireless_dev *wdev; 2075 2076 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2077 GFP_KERNEL); 2078 if (!sdata) 2079 return -ENOMEM; 2080 wdev = &sdata->wdev; 2081 2082 sdata->dev = NULL; 2083 strscpy(sdata->name, name, IFNAMSIZ); 2084 ieee80211_assign_perm_addr(local, wdev->address, type); 2085 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2086 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2087 } else { 2088 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2089 sizeof(void *)); 2090 int txq_size = 0; 2091 2092 if (type != NL80211_IFTYPE_AP_VLAN && 2093 (type != NL80211_IFTYPE_MONITOR || 2094 (params->flags & MONITOR_FLAG_ACTIVE))) 2095 txq_size += sizeof(struct txq_info) + 2096 local->hw.txq_data_size; 2097 2098 ndev = alloc_netdev_mqs(size + txq_size, 2099 name, name_assign_type, 2100 ieee80211_if_setup, 1, 1); 2101 if (!ndev) 2102 return -ENOMEM; 2103 2104 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2105 2106 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2107 2108 ndev->needed_headroom = local->tx_headroom + 2109 4*6 /* four MAC addresses */ 2110 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2111 + 6 /* mesh */ 2112 + 8 /* rfc1042/bridge tunnel */ 2113 - ETH_HLEN /* ethernet hard_header_len */ 2114 + IEEE80211_ENCRYPT_HEADROOM; 2115 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2116 2117 ret = dev_alloc_name(ndev, ndev->name); 2118 if (ret < 0) { 2119 free_netdev(ndev); 2120 return ret; 2121 } 2122 2123 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2124 if (is_valid_ether_addr(params->macaddr)) 2125 eth_hw_addr_set(ndev, params->macaddr); 2126 else 2127 eth_hw_addr_set(ndev, ndev->perm_addr); 2128 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2129 2130 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2131 sdata = netdev_priv(ndev); 2132 ndev->ieee80211_ptr = &sdata->wdev; 2133 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2134 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2135 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2136 2137 if (txq_size) { 2138 txqi = netdev_priv(ndev) + size; 2139 ieee80211_txq_init(sdata, NULL, txqi, 0); 2140 } 2141 2142 sdata->dev = ndev; 2143 } 2144 2145 /* initialise type-independent data */ 2146 sdata->wdev.wiphy = local->hw.wiphy; 2147 2148 ieee80211_sdata_init(local, sdata); 2149 2150 ieee80211_init_frag_cache(&sdata->frags); 2151 2152 INIT_LIST_HEAD(&sdata->key_list); 2153 2154 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2155 ieee80211_delayed_tailroom_dec); 2156 2157 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2158 struct ieee80211_supported_band *sband; 2159 sband = local->hw.wiphy->bands[i]; 2160 sdata->rc_rateidx_mask[i] = 2161 sband ? (1 << sband->n_bitrates) - 1 : 0; 2162 if (sband) { 2163 __le16 cap; 2164 u16 *vht_rate_mask; 2165 2166 memcpy(sdata->rc_rateidx_mcs_mask[i], 2167 sband->ht_cap.mcs.rx_mask, 2168 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2169 2170 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2171 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2172 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2173 } else { 2174 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2175 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2176 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2177 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2178 } 2179 } 2180 2181 ieee80211_set_default_queues(sdata); 2182 2183 /* setup type-dependent data */ 2184 ieee80211_setup_sdata(sdata, type); 2185 2186 if (ndev) { 2187 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2188 if (type == NL80211_IFTYPE_STATION) 2189 sdata->u.mgd.use_4addr = params->use_4addr; 2190 2191 ndev->features |= local->hw.netdev_features; 2192 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2193 ndev->hw_features |= ndev->features & 2194 MAC80211_SUPPORTED_FEATURES_TX; 2195 sdata->vif.netdev_features = local->hw.netdev_features; 2196 2197 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2198 2199 /* MTU range is normally 256 - 2304, where the upper limit is 2200 * the maximum MSDU size. Monitor interfaces send and receive 2201 * MPDU and A-MSDU frames which may be much larger so we do 2202 * not impose an upper limit in that case. 2203 */ 2204 ndev->min_mtu = 256; 2205 if (type == NL80211_IFTYPE_MONITOR) 2206 ndev->max_mtu = 0; 2207 else 2208 ndev->max_mtu = local->hw.max_mtu; 2209 2210 ret = cfg80211_register_netdevice(ndev); 2211 if (ret) { 2212 free_netdev(ndev); 2213 return ret; 2214 } 2215 } 2216 2217 mutex_lock(&local->iflist_mtx); 2218 list_add_tail_rcu(&sdata->list, &local->interfaces); 2219 mutex_unlock(&local->iflist_mtx); 2220 2221 if (new_wdev) 2222 *new_wdev = &sdata->wdev; 2223 2224 return 0; 2225 } 2226 2227 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2228 { 2229 ASSERT_RTNL(); 2230 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2231 2232 mutex_lock(&sdata->local->iflist_mtx); 2233 list_del_rcu(&sdata->list); 2234 mutex_unlock(&sdata->local->iflist_mtx); 2235 2236 if (sdata->vif.txq) 2237 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2238 2239 synchronize_rcu(); 2240 2241 cfg80211_unregister_wdev(&sdata->wdev); 2242 2243 if (!sdata->dev) { 2244 ieee80211_teardown_sdata(sdata); 2245 kfree(sdata); 2246 } 2247 } 2248 2249 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2250 { 2251 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2252 return; 2253 ieee80211_do_stop(sdata, true); 2254 } 2255 2256 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2257 { 2258 struct ieee80211_sub_if_data *sdata, *tmp; 2259 LIST_HEAD(unreg_list); 2260 2261 ASSERT_RTNL(); 2262 2263 /* Before destroying the interfaces, make sure they're all stopped so 2264 * that the hardware is stopped. Otherwise, the driver might still be 2265 * iterating the interfaces during the shutdown, e.g. from a worker 2266 * or from RX processing or similar, and if it does so (using atomic 2267 * iteration) while we're manipulating the list, the iteration will 2268 * crash. 2269 * 2270 * After this, the hardware should be stopped and the driver should 2271 * have stopped all of its activities, so that we can do RCU-unaware 2272 * manipulations of the interface list below. 2273 */ 2274 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2275 2276 guard(wiphy)(local->hw.wiphy); 2277 2278 WARN(local->open_count, "%s: open count remains %d\n", 2279 wiphy_name(local->hw.wiphy), local->open_count); 2280 2281 mutex_lock(&local->iflist_mtx); 2282 list_splice_init(&local->interfaces, &unreg_list); 2283 mutex_unlock(&local->iflist_mtx); 2284 2285 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2286 bool netdev = sdata->dev; 2287 2288 /* 2289 * Remove IP addresses explicitly, since the notifier will 2290 * skip the callbacks if wdev->registered is false, since 2291 * we can't acquire the wiphy_lock() again there if already 2292 * inside this locked section. 2293 */ 2294 sdata->vif.cfg.arp_addr_cnt = 0; 2295 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2296 sdata->u.mgd.associated) 2297 ieee80211_vif_cfg_change_notify(sdata, 2298 BSS_CHANGED_ARP_FILTER); 2299 2300 list_del(&sdata->list); 2301 cfg80211_unregister_wdev(&sdata->wdev); 2302 2303 if (!netdev) 2304 kfree(sdata); 2305 } 2306 } 2307 2308 static int netdev_notify(struct notifier_block *nb, 2309 unsigned long state, void *ptr) 2310 { 2311 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2312 struct ieee80211_sub_if_data *sdata; 2313 2314 if (state != NETDEV_CHANGENAME) 2315 return NOTIFY_DONE; 2316 2317 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2318 return NOTIFY_DONE; 2319 2320 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2321 return NOTIFY_DONE; 2322 2323 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2324 memcpy(sdata->name, dev->name, IFNAMSIZ); 2325 ieee80211_debugfs_rename_netdev(sdata); 2326 2327 return NOTIFY_OK; 2328 } 2329 2330 static struct notifier_block mac80211_netdev_notifier = { 2331 .notifier_call = netdev_notify, 2332 }; 2333 2334 int ieee80211_iface_init(void) 2335 { 2336 return register_netdevice_notifier(&mac80211_netdev_notifier); 2337 } 2338 2339 void ieee80211_iface_exit(void) 2340 { 2341 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2342 } 2343 2344 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2345 { 2346 if (sdata->vif.type == NL80211_IFTYPE_AP) 2347 atomic_inc(&sdata->u.ap.num_mcast_sta); 2348 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2349 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2350 } 2351 2352 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2353 { 2354 if (sdata->vif.type == NL80211_IFTYPE_AP) 2355 atomic_dec(&sdata->u.ap.num_mcast_sta); 2356 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2357 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2358 } 2359 2360 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2361 { 2362 struct ieee80211_local *local = sdata->local; 2363 2364 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2365 return; 2366 2367 ieee80211_stop_vif_queues_norefcount(local, sdata, 2368 IEEE80211_QUEUE_STOP_REASON_CSA); 2369 } 2370 2371 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2372 { 2373 struct ieee80211_local *local = sdata->local; 2374 2375 ieee80211_wake_vif_queues_norefcount(local, sdata, 2376 IEEE80211_QUEUE_STOP_REASON_CSA); 2377 } 2378