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_sub_if_data *sdata) 48 { 49 struct ieee80211_chanctx_conf *chanctx_conf; 50 int power; 51 52 rcu_read_lock(); 53 chanctx_conf = rcu_dereference(sdata->vif.bss_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 (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL) 63 power = min(power, sdata->deflink.user_power_level); 64 65 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 66 power = min(power, sdata->deflink.ap_power_level); 67 68 if (power != sdata->vif.bss_conf.txpower) { 69 sdata->vif.bss_conf.txpower = power; 70 ieee80211_hw_config(sdata->local, 0); 71 return true; 72 } 73 74 return false; 75 } 76 77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 78 bool update_bss) 79 { 80 if (__ieee80211_recalc_txpower(sdata) || 81 (update_bss && ieee80211_sdata_running(sdata))) 82 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 83 BSS_CHANGED_TXPOWER); 84 } 85 86 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 87 { 88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 89 return 0; 90 91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 92 return IEEE80211_CONF_CHANGE_IDLE; 93 } 94 95 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 96 { 97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 98 return 0; 99 100 ieee80211_flush_queues(local, NULL, false); 101 102 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 103 return IEEE80211_CONF_CHANGE_IDLE; 104 } 105 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 107 bool force_active) 108 { 109 bool working, scanning, active; 110 unsigned int led_trig_start = 0, led_trig_stop = 0; 111 112 lockdep_assert_wiphy(local->hw.wiphy); 113 114 active = force_active || 115 !list_empty(&local->chanctx_list) || 116 local->monitors; 117 118 working = !local->ops->remain_on_channel && 119 !list_empty(&local->roc_list); 120 121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 123 124 if (working || scanning) 125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 else 127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 128 129 if (active) 130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 else 132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 133 134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 135 136 if (working || scanning || active) 137 return __ieee80211_idle_off(local); 138 return __ieee80211_idle_on(local); 139 } 140 141 u32 ieee80211_idle_off(struct ieee80211_local *local) 142 { 143 return __ieee80211_recalc_idle(local, true); 144 } 145 146 void ieee80211_recalc_idle(struct ieee80211_local *local) 147 { 148 u32 change = __ieee80211_recalc_idle(local, false); 149 if (change) 150 ieee80211_hw_config(local, change); 151 } 152 153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 154 bool check_dup) 155 { 156 struct ieee80211_local *local = sdata->local; 157 struct ieee80211_sub_if_data *iter; 158 u64 new, mask, tmp; 159 u8 *m; 160 int ret = 0; 161 162 lockdep_assert_wiphy(local->hw.wiphy); 163 164 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 165 return 0; 166 167 m = addr; 168 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 169 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 170 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 171 172 m = local->hw.wiphy->addr_mask; 173 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 176 177 if (!check_dup) 178 return ret; 179 180 list_for_each_entry(iter, &local->interfaces, list) { 181 if (iter == sdata) 182 continue; 183 184 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 186 continue; 187 188 m = iter->vif.addr; 189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 192 193 if ((new & ~mask) != (tmp & ~mask)) { 194 ret = -EINVAL; 195 break; 196 } 197 } 198 199 return ret; 200 } 201 202 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 203 { 204 struct ieee80211_roc_work *roc; 205 struct ieee80211_local *local = sdata->local; 206 struct ieee80211_sub_if_data *scan_sdata; 207 int ret = 0; 208 209 lockdep_assert_wiphy(local->hw.wiphy); 210 211 /* To be the most flexible here we want to only limit changing the 212 * address if the specific interface is doing offchannel work or 213 * scanning. 214 */ 215 if (netif_carrier_ok(sdata->dev)) 216 return -EBUSY; 217 218 /* First check no ROC work is happening on this iface */ 219 list_for_each_entry(roc, &local->roc_list, list) { 220 if (roc->sdata != sdata) 221 continue; 222 223 if (roc->started) { 224 ret = -EBUSY; 225 goto unlock; 226 } 227 } 228 229 /* And if this iface is scanning */ 230 if (local->scanning) { 231 scan_sdata = rcu_dereference_protected(local->scan_sdata, 232 lockdep_is_held(&local->hw.wiphy->mtx)); 233 if (sdata == scan_sdata) 234 ret = -EBUSY; 235 } 236 237 switch (sdata->vif.type) { 238 case NL80211_IFTYPE_STATION: 239 case NL80211_IFTYPE_P2P_CLIENT: 240 /* More interface types could be added here but changing the 241 * address while powered makes the most sense in client modes. 242 */ 243 break; 244 default: 245 ret = -EOPNOTSUPP; 246 } 247 248 unlock: 249 return ret; 250 } 251 252 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata, 253 void *addr) 254 { 255 struct ieee80211_local *local = sdata->local; 256 struct sockaddr *sa = addr; 257 bool check_dup = true; 258 bool live = false; 259 int ret; 260 261 if (ieee80211_sdata_running(sdata)) { 262 ret = ieee80211_can_powered_addr_change(sdata); 263 if (ret) 264 return ret; 265 266 live = true; 267 } 268 269 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 270 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 271 check_dup = false; 272 273 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 274 if (ret) 275 return ret; 276 277 if (live) 278 drv_remove_interface(local, sdata); 279 ret = eth_mac_addr(sdata->dev, sa); 280 281 if (ret == 0) { 282 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 283 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 284 } 285 286 /* Regardless of eth_mac_addr() return we still want to add the 287 * interface back. This should not fail... 288 */ 289 if (live) 290 WARN_ON(drv_add_interface(local, sdata)); 291 292 return ret; 293 } 294 295 static int ieee80211_change_mac(struct net_device *dev, void *addr) 296 { 297 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 298 struct ieee80211_local *local = sdata->local; 299 int ret; 300 301 /* 302 * This happens during unregistration if there's a bond device 303 * active (maybe other cases?) and we must get removed from it. 304 * But we really don't care anymore if it's not registered now. 305 */ 306 if (!dev->ieee80211_ptr->registered) 307 return 0; 308 309 wiphy_lock(local->hw.wiphy); 310 ret = _ieee80211_change_mac(sdata, addr); 311 wiphy_unlock(local->hw.wiphy); 312 313 return ret; 314 } 315 316 static inline int identical_mac_addr_allowed(int type1, int type2) 317 { 318 return type1 == NL80211_IFTYPE_MONITOR || 319 type2 == NL80211_IFTYPE_MONITOR || 320 type1 == NL80211_IFTYPE_P2P_DEVICE || 321 type2 == NL80211_IFTYPE_P2P_DEVICE || 322 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 323 (type1 == NL80211_IFTYPE_AP_VLAN && 324 (type2 == NL80211_IFTYPE_AP || 325 type2 == NL80211_IFTYPE_AP_VLAN)); 326 } 327 328 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 329 enum nl80211_iftype iftype) 330 { 331 struct ieee80211_local *local = sdata->local; 332 struct ieee80211_sub_if_data *nsdata; 333 334 ASSERT_RTNL(); 335 lockdep_assert_wiphy(local->hw.wiphy); 336 337 /* we hold the RTNL here so can safely walk the list */ 338 list_for_each_entry(nsdata, &local->interfaces, list) { 339 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 340 /* 341 * Only OCB and monitor mode may coexist 342 */ 343 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 344 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 345 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 346 nsdata->vif.type == NL80211_IFTYPE_OCB)) 347 return -EBUSY; 348 349 /* 350 * Allow only a single IBSS interface to be up at any 351 * time. This is restricted because beacon distribution 352 * cannot work properly if both are in the same IBSS. 353 * 354 * To remove this restriction we'd have to disallow them 355 * from setting the same SSID on different IBSS interfaces 356 * belonging to the same hardware. Then, however, we're 357 * faced with having to adopt two different TSF timers... 358 */ 359 if (iftype == NL80211_IFTYPE_ADHOC && 360 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 361 return -EBUSY; 362 /* 363 * will not add another interface while any channel 364 * switch is active. 365 */ 366 if (nsdata->vif.bss_conf.csa_active) 367 return -EBUSY; 368 369 /* 370 * The remaining checks are only performed for interfaces 371 * with the same MAC address. 372 */ 373 if (!ether_addr_equal(sdata->vif.addr, 374 nsdata->vif.addr)) 375 continue; 376 377 /* 378 * check whether it may have the same address 379 */ 380 if (!identical_mac_addr_allowed(iftype, 381 nsdata->vif.type)) 382 return -ENOTUNIQ; 383 384 /* No support for VLAN with MLO yet */ 385 if (iftype == NL80211_IFTYPE_AP_VLAN && 386 sdata->wdev.use_4addr && 387 nsdata->vif.type == NL80211_IFTYPE_AP && 388 nsdata->vif.valid_links) 389 return -EOPNOTSUPP; 390 391 /* 392 * can only add VLANs to enabled APs 393 */ 394 if (iftype == NL80211_IFTYPE_AP_VLAN && 395 nsdata->vif.type == NL80211_IFTYPE_AP) 396 sdata->bss = &nsdata->u.ap; 397 } 398 } 399 400 return ieee80211_check_combinations(sdata, NULL, 0, 0); 401 } 402 403 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 404 enum nl80211_iftype iftype) 405 { 406 int n_queues = sdata->local->hw.queues; 407 int i; 408 409 if (iftype == NL80211_IFTYPE_NAN) 410 return 0; 411 412 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 413 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 414 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 415 IEEE80211_INVAL_HW_QUEUE)) 416 return -EINVAL; 417 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 418 n_queues)) 419 return -EINVAL; 420 } 421 } 422 423 if ((iftype != NL80211_IFTYPE_AP && 424 iftype != NL80211_IFTYPE_P2P_GO && 425 iftype != NL80211_IFTYPE_MESH_POINT) || 426 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 427 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 428 return 0; 429 } 430 431 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 432 return -EINVAL; 433 434 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 435 return -EINVAL; 436 437 return 0; 438 } 439 440 static int ieee80211_open(struct net_device *dev) 441 { 442 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 443 int err; 444 445 /* fail early if user set an invalid address */ 446 if (!is_valid_ether_addr(dev->dev_addr)) 447 return -EADDRNOTAVAIL; 448 449 wiphy_lock(sdata->local->hw.wiphy); 450 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 451 if (err) 452 goto out; 453 454 err = ieee80211_do_open(&sdata->wdev, true); 455 out: 456 wiphy_unlock(sdata->local->hw.wiphy); 457 458 return err; 459 } 460 461 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 462 { 463 struct ieee80211_local *local = sdata->local; 464 unsigned long flags; 465 struct sk_buff *skb, *tmp; 466 u32 hw_reconf_flags = 0; 467 int i, flushed; 468 struct ps_data *ps; 469 struct cfg80211_chan_def chandef; 470 bool cancel_scan; 471 struct cfg80211_nan_func *func; 472 473 lockdep_assert_wiphy(local->hw.wiphy); 474 475 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 476 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 477 478 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 479 if (cancel_scan) 480 ieee80211_scan_cancel(local); 481 482 ieee80211_roc_purge(local, sdata); 483 484 switch (sdata->vif.type) { 485 case NL80211_IFTYPE_STATION: 486 ieee80211_mgd_stop(sdata); 487 break; 488 case NL80211_IFTYPE_ADHOC: 489 ieee80211_ibss_stop(sdata); 490 break; 491 case NL80211_IFTYPE_MONITOR: 492 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 493 break; 494 list_del_rcu(&sdata->u.mntr.list); 495 break; 496 default: 497 break; 498 } 499 500 /* 501 * Remove all stations associated with this interface. 502 * 503 * This must be done before calling ops->remove_interface() 504 * because otherwise we can later invoke ops->sta_notify() 505 * whenever the STAs are removed, and that invalidates driver 506 * assumptions about always getting a vif pointer that is valid 507 * (because if we remove a STA after ops->remove_interface() 508 * the driver will have removed the vif info already!) 509 * 510 * For AP_VLANs stations may exist since there's nothing else that 511 * would have removed them, but in other modes there shouldn't 512 * be any stations. 513 */ 514 flushed = sta_info_flush(sdata, -1); 515 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 516 517 /* don't count this interface for allmulti while it is down */ 518 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 519 atomic_dec(&local->iff_allmultis); 520 521 if (sdata->vif.type == NL80211_IFTYPE_AP) { 522 local->fif_pspoll--; 523 local->fif_probe_req--; 524 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 525 local->fif_probe_req--; 526 } 527 528 if (sdata->dev) { 529 netif_addr_lock_bh(sdata->dev); 530 spin_lock_bh(&local->filter_lock); 531 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 532 sdata->dev->addr_len); 533 spin_unlock_bh(&local->filter_lock); 534 netif_addr_unlock_bh(sdata->dev); 535 } 536 537 del_timer_sync(&local->dynamic_ps_timer); 538 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 539 540 WARN(ieee80211_vif_is_mld(&sdata->vif), 541 "destroying interface with valid links 0x%04x\n", 542 sdata->vif.valid_links); 543 544 sdata->vif.bss_conf.csa_active = false; 545 if (sdata->vif.type == NL80211_IFTYPE_STATION) 546 sdata->deflink.u.mgd.csa.waiting_bcn = false; 547 ieee80211_vif_unblock_queues_csa(sdata); 548 549 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); 550 wiphy_work_cancel(local->hw.wiphy, 551 &sdata->deflink.color_change_finalize_work); 552 wiphy_delayed_work_cancel(local->hw.wiphy, 553 &sdata->dfs_cac_timer_work); 554 555 if (sdata->wdev.cac_started) { 556 chandef = sdata->vif.bss_conf.chanreq.oper; 557 WARN_ON(local->suspended); 558 ieee80211_link_release_channel(&sdata->deflink); 559 cfg80211_cac_event(sdata->dev, &chandef, 560 NL80211_RADAR_CAC_ABORTED, 561 GFP_KERNEL); 562 } 563 564 if (sdata->vif.type == NL80211_IFTYPE_AP) { 565 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 566 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 567 /* remove all packets in parent bc_buf pointing to this dev */ 568 ps = &sdata->bss->ps; 569 570 spin_lock_irqsave(&ps->bc_buf.lock, flags); 571 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 572 if (skb->dev == sdata->dev) { 573 __skb_unlink(skb, &ps->bc_buf); 574 local->total_ps_buffered--; 575 ieee80211_free_txskb(&local->hw, skb); 576 } 577 } 578 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 579 } 580 581 if (going_down) 582 local->open_count--; 583 584 switch (sdata->vif.type) { 585 case NL80211_IFTYPE_AP_VLAN: 586 list_del(&sdata->u.vlan.list); 587 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 588 /* see comment in the default case below */ 589 ieee80211_free_keys(sdata, true); 590 /* no need to tell driver */ 591 break; 592 case NL80211_IFTYPE_MONITOR: 593 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 594 local->cooked_mntrs--; 595 break; 596 } 597 598 local->monitors--; 599 if (local->monitors == 0) { 600 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 601 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 602 } 603 604 ieee80211_adjust_monitor_flags(sdata, -1); 605 break; 606 case NL80211_IFTYPE_NAN: 607 /* clean all the functions */ 608 spin_lock_bh(&sdata->u.nan.func_lock); 609 610 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 611 idr_remove(&sdata->u.nan.function_inst_ids, i); 612 cfg80211_free_nan_func(func); 613 } 614 idr_destroy(&sdata->u.nan.function_inst_ids); 615 616 spin_unlock_bh(&sdata->u.nan.func_lock); 617 break; 618 case NL80211_IFTYPE_P2P_DEVICE: 619 /* relies on synchronize_rcu() below */ 620 RCU_INIT_POINTER(local->p2p_sdata, NULL); 621 fallthrough; 622 default: 623 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 624 /* 625 * When we get here, the interface is marked down. 626 * Free the remaining keys, if there are any 627 * (which can happen in AP mode if userspace sets 628 * keys before the interface is operating) 629 * 630 * Force the key freeing to always synchronize_net() 631 * to wait for the RX path in case it is using this 632 * interface enqueuing frames at this very time on 633 * another CPU. 634 */ 635 ieee80211_free_keys(sdata, true); 636 skb_queue_purge(&sdata->skb_queue); 637 skb_queue_purge(&sdata->status_queue); 638 } 639 640 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 641 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 642 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 644 if (info->control.vif == &sdata->vif) { 645 __skb_unlink(skb, &local->pending[i]); 646 ieee80211_free_txskb(&local->hw, skb); 647 } 648 } 649 } 650 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 651 652 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 653 ieee80211_txq_remove_vlan(local, sdata); 654 655 sdata->bss = NULL; 656 657 if (local->open_count == 0) 658 ieee80211_clear_tx_pending(local); 659 660 sdata->vif.bss_conf.beacon_int = 0; 661 662 /* 663 * If the interface goes down while suspended, presumably because 664 * the device was unplugged and that happens before our resume, 665 * then the driver is already unconfigured and the remainder of 666 * this function isn't needed. 667 * XXX: what about WoWLAN? If the device has software state, e.g. 668 * memory allocated, it might expect teardown commands from 669 * mac80211 here? 670 */ 671 if (local->suspended) { 672 WARN_ON(local->wowlan); 673 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 674 return; 675 } 676 677 switch (sdata->vif.type) { 678 case NL80211_IFTYPE_AP_VLAN: 679 break; 680 case NL80211_IFTYPE_MONITOR: 681 if (local->monitors == 0) 682 ieee80211_del_virtual_monitor(local); 683 684 ieee80211_recalc_idle(local); 685 686 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 687 break; 688 689 fallthrough; 690 default: 691 if (going_down) 692 drv_remove_interface(local, sdata); 693 } 694 695 ieee80211_recalc_ps(local); 696 697 if (cancel_scan) 698 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 699 700 if (local->open_count == 0) { 701 ieee80211_stop_device(local, false); 702 703 /* no reconfiguring after stop! */ 704 return; 705 } 706 707 /* do after stop to avoid reconfiguring when we stop anyway */ 708 ieee80211_configure_filter(local); 709 ieee80211_hw_config(local, hw_reconf_flags); 710 711 if (local->monitors == local->open_count) 712 ieee80211_add_virtual_monitor(local); 713 } 714 715 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 716 { 717 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 718 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 719 720 if (!tx_vif) 721 return; 722 723 tx_sdata = vif_to_sdata(tx_vif); 724 sdata->vif.mbssid_tx_vif = NULL; 725 726 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 727 &tx_sdata->local->interfaces, list) { 728 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 729 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 730 ieee80211_sdata_running(non_tx_sdata)) { 731 non_tx_sdata->vif.mbssid_tx_vif = NULL; 732 dev_close(non_tx_sdata->wdev.netdev); 733 } 734 } 735 736 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 737 tx_sdata->vif.mbssid_tx_vif = NULL; 738 dev_close(tx_sdata->wdev.netdev); 739 } 740 } 741 742 static int ieee80211_stop(struct net_device *dev) 743 { 744 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 745 746 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 747 if (sdata->vif.type == NL80211_IFTYPE_AP) { 748 struct ieee80211_sub_if_data *vlan, *tmpsdata; 749 750 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 751 u.vlan.list) 752 dev_close(vlan->dev); 753 754 ieee80211_stop_mbssid(sdata); 755 } 756 757 wiphy_lock(sdata->local->hw.wiphy); 758 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 759 760 ieee80211_do_stop(sdata, true); 761 wiphy_unlock(sdata->local->hw.wiphy); 762 763 return 0; 764 } 765 766 static void ieee80211_set_multicast_list(struct net_device *dev) 767 { 768 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 769 struct ieee80211_local *local = sdata->local; 770 int allmulti, sdata_allmulti; 771 772 allmulti = !!(dev->flags & IFF_ALLMULTI); 773 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 774 775 if (allmulti != sdata_allmulti) { 776 if (dev->flags & IFF_ALLMULTI) 777 atomic_inc(&local->iff_allmultis); 778 else 779 atomic_dec(&local->iff_allmultis); 780 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 781 } 782 783 spin_lock_bh(&local->filter_lock); 784 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 785 spin_unlock_bh(&local->filter_lock); 786 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 787 } 788 789 /* 790 * Called when the netdev is removed or, by the code below, before 791 * the interface type changes. 792 */ 793 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 794 { 795 /* free extra data */ 796 ieee80211_free_keys(sdata, false); 797 798 ieee80211_debugfs_remove_netdev(sdata); 799 800 ieee80211_destroy_frag_cache(&sdata->frags); 801 802 if (ieee80211_vif_is_mesh(&sdata->vif)) 803 ieee80211_mesh_teardown_sdata(sdata); 804 805 ieee80211_vif_clear_links(sdata); 806 ieee80211_link_stop(&sdata->deflink); 807 } 808 809 static void ieee80211_uninit(struct net_device *dev) 810 { 811 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 812 } 813 814 static int ieee80211_netdev_setup_tc(struct net_device *dev, 815 enum tc_setup_type type, void *type_data) 816 { 817 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 818 struct ieee80211_local *local = sdata->local; 819 820 return drv_net_setup_tc(local, sdata, dev, type, type_data); 821 } 822 823 static const struct net_device_ops ieee80211_dataif_ops = { 824 .ndo_open = ieee80211_open, 825 .ndo_stop = ieee80211_stop, 826 .ndo_uninit = ieee80211_uninit, 827 .ndo_start_xmit = ieee80211_subif_start_xmit, 828 .ndo_set_rx_mode = ieee80211_set_multicast_list, 829 .ndo_set_mac_address = ieee80211_change_mac, 830 .ndo_setup_tc = ieee80211_netdev_setup_tc, 831 }; 832 833 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 834 struct sk_buff *skb, 835 struct net_device *sb_dev) 836 { 837 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 838 struct ieee80211_local *local = sdata->local; 839 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 840 struct ieee80211_hdr *hdr; 841 int len_rthdr; 842 843 if (local->hw.queues < IEEE80211_NUM_ACS) 844 return 0; 845 846 /* reset flags and info before parsing radiotap header */ 847 memset(info, 0, sizeof(*info)); 848 849 if (!ieee80211_parse_tx_radiotap(skb, dev)) 850 return 0; /* doesn't matter, frame will be dropped */ 851 852 len_rthdr = ieee80211_get_radiotap_len(skb->data); 853 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 854 if (skb->len < len_rthdr + 2 || 855 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 856 return 0; /* doesn't matter, frame will be dropped */ 857 858 return ieee80211_select_queue_80211(sdata, skb, hdr); 859 } 860 861 static const struct net_device_ops ieee80211_monitorif_ops = { 862 .ndo_open = ieee80211_open, 863 .ndo_stop = ieee80211_stop, 864 .ndo_uninit = ieee80211_uninit, 865 .ndo_start_xmit = ieee80211_monitor_start_xmit, 866 .ndo_set_rx_mode = ieee80211_set_multicast_list, 867 .ndo_set_mac_address = ieee80211_change_mac, 868 .ndo_select_queue = ieee80211_monitor_select_queue, 869 }; 870 871 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 872 struct net_device_path *path) 873 { 874 struct ieee80211_sub_if_data *sdata; 875 struct ieee80211_local *local; 876 struct sta_info *sta; 877 int ret = -ENOENT; 878 879 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 880 local = sdata->local; 881 882 if (!local->ops->net_fill_forward_path) 883 return -EOPNOTSUPP; 884 885 rcu_read_lock(); 886 switch (sdata->vif.type) { 887 case NL80211_IFTYPE_AP_VLAN: 888 sta = rcu_dereference(sdata->u.vlan.sta); 889 if (sta) 890 break; 891 if (sdata->wdev.use_4addr) 892 goto out; 893 if (is_multicast_ether_addr(ctx->daddr)) 894 goto out; 895 sta = sta_info_get_bss(sdata, ctx->daddr); 896 break; 897 case NL80211_IFTYPE_AP: 898 if (is_multicast_ether_addr(ctx->daddr)) 899 goto out; 900 sta = sta_info_get(sdata, ctx->daddr); 901 break; 902 case NL80211_IFTYPE_STATION: 903 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 904 sta = sta_info_get(sdata, ctx->daddr); 905 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 906 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 907 goto out; 908 909 break; 910 } 911 } 912 913 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 914 break; 915 default: 916 goto out; 917 } 918 919 if (!sta) 920 goto out; 921 922 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 923 out: 924 rcu_read_unlock(); 925 926 return ret; 927 } 928 929 static const struct net_device_ops ieee80211_dataif_8023_ops = { 930 .ndo_open = ieee80211_open, 931 .ndo_stop = ieee80211_stop, 932 .ndo_uninit = ieee80211_uninit, 933 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 934 .ndo_set_rx_mode = ieee80211_set_multicast_list, 935 .ndo_set_mac_address = ieee80211_change_mac, 936 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 937 .ndo_setup_tc = ieee80211_netdev_setup_tc, 938 }; 939 940 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 941 { 942 switch (iftype) { 943 /* P2P GO and client are mapped to AP/STATION types */ 944 case NL80211_IFTYPE_AP: 945 case NL80211_IFTYPE_STATION: 946 return true; 947 default: 948 return false; 949 } 950 } 951 952 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 953 { 954 struct ieee80211_local *local = sdata->local; 955 u32 flags; 956 957 flags = sdata->vif.offload_flags; 958 959 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 960 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 961 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 962 963 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 964 local->hw.wiphy->frag_threshold != (u32)-1) 965 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 966 967 if (local->monitors) 968 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 969 } else { 970 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 971 } 972 973 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 974 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 975 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 976 977 if (local->monitors && 978 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 979 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 980 } else { 981 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 982 } 983 984 if (sdata->vif.offload_flags == flags) 985 return false; 986 987 sdata->vif.offload_flags = flags; 988 ieee80211_check_fast_rx_iface(sdata); 989 return true; 990 } 991 992 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 993 { 994 struct ieee80211_local *local = sdata->local; 995 struct ieee80211_sub_if_data *bss = sdata; 996 bool enabled; 997 998 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 999 if (!sdata->bss) 1000 return; 1001 1002 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1003 } 1004 1005 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1006 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1007 return; 1008 1009 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1010 if (sdata->wdev.use_4addr && 1011 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1012 enabled = false; 1013 1014 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1015 &ieee80211_dataif_ops; 1016 } 1017 1018 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1019 { 1020 struct ieee80211_local *local = sdata->local; 1021 struct ieee80211_sub_if_data *vsdata; 1022 1023 if (ieee80211_set_sdata_offload_flags(sdata)) { 1024 drv_update_vif_offload(local, sdata); 1025 ieee80211_set_vif_encap_ops(sdata); 1026 } 1027 1028 list_for_each_entry(vsdata, &local->interfaces, list) { 1029 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1030 vsdata->bss != &sdata->u.ap) 1031 continue; 1032 1033 ieee80211_set_vif_encap_ops(vsdata); 1034 } 1035 } 1036 1037 void ieee80211_recalc_offload(struct ieee80211_local *local) 1038 { 1039 struct ieee80211_sub_if_data *sdata; 1040 1041 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1042 return; 1043 1044 lockdep_assert_wiphy(local->hw.wiphy); 1045 1046 list_for_each_entry(sdata, &local->interfaces, list) { 1047 if (!ieee80211_sdata_running(sdata)) 1048 continue; 1049 1050 ieee80211_recalc_sdata_offload(sdata); 1051 } 1052 } 1053 1054 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1055 const int offset) 1056 { 1057 struct ieee80211_local *local = sdata->local; 1058 u32 flags = sdata->u.mntr.flags; 1059 1060 #define ADJUST(_f, _s) do { \ 1061 if (flags & MONITOR_FLAG_##_f) \ 1062 local->fif_##_s += offset; \ 1063 } while (0) 1064 1065 ADJUST(FCSFAIL, fcsfail); 1066 ADJUST(PLCPFAIL, plcpfail); 1067 ADJUST(CONTROL, control); 1068 ADJUST(CONTROL, pspoll); 1069 ADJUST(OTHER_BSS, other_bss); 1070 1071 #undef ADJUST 1072 } 1073 1074 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1075 { 1076 struct ieee80211_local *local = sdata->local; 1077 int i; 1078 1079 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1080 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1081 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1082 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1083 sdata->vif.hw_queue[i] = i; 1084 else 1085 sdata->vif.hw_queue[i] = 0; 1086 } 1087 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1088 } 1089 1090 static void ieee80211_sdata_init(struct ieee80211_local *local, 1091 struct ieee80211_sub_if_data *sdata) 1092 { 1093 sdata->local = local; 1094 1095 /* 1096 * Initialize the default link, so we can use link_id 0 for non-MLD, 1097 * and that continues to work for non-MLD-aware drivers that use just 1098 * vif.bss_conf instead of vif.link_conf. 1099 * 1100 * Note that we never change this, so if link ID 0 isn't used in an 1101 * MLD connection, we get a separate allocation for it. 1102 */ 1103 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1104 } 1105 1106 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1107 { 1108 struct ieee80211_sub_if_data *sdata; 1109 int ret; 1110 1111 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1112 return 0; 1113 1114 ASSERT_RTNL(); 1115 lockdep_assert_wiphy(local->hw.wiphy); 1116 1117 if (local->monitor_sdata) 1118 return 0; 1119 1120 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1121 if (!sdata) 1122 return -ENOMEM; 1123 1124 /* set up data */ 1125 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1126 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1127 wiphy_name(local->hw.wiphy)); 1128 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1129 sdata->wdev.wiphy = local->hw.wiphy; 1130 1131 ieee80211_sdata_init(local, sdata); 1132 1133 ieee80211_set_default_queues(sdata); 1134 1135 ret = drv_add_interface(local, sdata); 1136 if (WARN_ON(ret)) { 1137 /* ok .. stupid driver, it asked for this! */ 1138 kfree(sdata); 1139 return ret; 1140 } 1141 1142 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1143 1144 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1145 if (ret) { 1146 kfree(sdata); 1147 return ret; 1148 } 1149 1150 mutex_lock(&local->iflist_mtx); 1151 rcu_assign_pointer(local->monitor_sdata, sdata); 1152 mutex_unlock(&local->iflist_mtx); 1153 1154 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1155 IEEE80211_CHANCTX_EXCLUSIVE); 1156 if (ret) { 1157 mutex_lock(&local->iflist_mtx); 1158 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1159 mutex_unlock(&local->iflist_mtx); 1160 synchronize_net(); 1161 drv_remove_interface(local, sdata); 1162 kfree(sdata); 1163 return ret; 1164 } 1165 1166 skb_queue_head_init(&sdata->skb_queue); 1167 skb_queue_head_init(&sdata->status_queue); 1168 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1169 1170 return 0; 1171 } 1172 1173 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1174 { 1175 struct ieee80211_sub_if_data *sdata; 1176 1177 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1178 return; 1179 1180 ASSERT_RTNL(); 1181 lockdep_assert_wiphy(local->hw.wiphy); 1182 1183 mutex_lock(&local->iflist_mtx); 1184 1185 sdata = rcu_dereference_protected(local->monitor_sdata, 1186 lockdep_is_held(&local->iflist_mtx)); 1187 if (!sdata) { 1188 mutex_unlock(&local->iflist_mtx); 1189 return; 1190 } 1191 1192 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1193 mutex_unlock(&local->iflist_mtx); 1194 1195 synchronize_net(); 1196 1197 ieee80211_link_release_channel(&sdata->deflink); 1198 1199 drv_remove_interface(local, sdata); 1200 1201 kfree(sdata); 1202 } 1203 1204 /* 1205 * NOTE: Be very careful when changing this function, it must NOT return 1206 * an error on interface type changes that have been pre-checked, so most 1207 * checks should be in ieee80211_check_concurrent_iface. 1208 */ 1209 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1210 { 1211 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1212 struct net_device *dev = wdev->netdev; 1213 struct ieee80211_local *local = sdata->local; 1214 u64 changed = 0; 1215 int res; 1216 u32 hw_reconf_flags = 0; 1217 1218 lockdep_assert_wiphy(local->hw.wiphy); 1219 1220 switch (sdata->vif.type) { 1221 case NL80211_IFTYPE_AP_VLAN: { 1222 struct ieee80211_sub_if_data *master; 1223 1224 if (!sdata->bss) 1225 return -ENOLINK; 1226 1227 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1228 1229 master = container_of(sdata->bss, 1230 struct ieee80211_sub_if_data, u.ap); 1231 sdata->control_port_protocol = 1232 master->control_port_protocol; 1233 sdata->control_port_no_encrypt = 1234 master->control_port_no_encrypt; 1235 sdata->control_port_over_nl80211 = 1236 master->control_port_over_nl80211; 1237 sdata->control_port_no_preauth = 1238 master->control_port_no_preauth; 1239 sdata->vif.cab_queue = master->vif.cab_queue; 1240 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1241 sizeof(sdata->vif.hw_queue)); 1242 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1243 1244 sdata->crypto_tx_tailroom_needed_cnt += 1245 master->crypto_tx_tailroom_needed_cnt; 1246 1247 break; 1248 } 1249 case NL80211_IFTYPE_AP: 1250 sdata->bss = &sdata->u.ap; 1251 break; 1252 case NL80211_IFTYPE_MESH_POINT: 1253 case NL80211_IFTYPE_STATION: 1254 case NL80211_IFTYPE_MONITOR: 1255 case NL80211_IFTYPE_ADHOC: 1256 case NL80211_IFTYPE_P2P_DEVICE: 1257 case NL80211_IFTYPE_OCB: 1258 case NL80211_IFTYPE_NAN: 1259 /* no special treatment */ 1260 break; 1261 case NL80211_IFTYPE_UNSPECIFIED: 1262 case NUM_NL80211_IFTYPES: 1263 case NL80211_IFTYPE_P2P_CLIENT: 1264 case NL80211_IFTYPE_P2P_GO: 1265 case NL80211_IFTYPE_WDS: 1266 /* cannot happen */ 1267 WARN_ON(1); 1268 break; 1269 } 1270 1271 if (local->open_count == 0) { 1272 /* here we can consider everything in good order (again) */ 1273 local->reconfig_failure = false; 1274 1275 res = drv_start(local); 1276 if (res) 1277 goto err_del_bss; 1278 ieee80211_led_radio(local, true); 1279 ieee80211_mod_tpt_led_trig(local, 1280 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1281 } 1282 1283 /* 1284 * Copy the hopefully now-present MAC address to 1285 * this interface, if it has the special null one. 1286 */ 1287 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1288 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1289 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1290 1291 if (!is_valid_ether_addr(dev->dev_addr)) { 1292 res = -EADDRNOTAVAIL; 1293 goto err_stop; 1294 } 1295 } 1296 1297 switch (sdata->vif.type) { 1298 case NL80211_IFTYPE_AP_VLAN: 1299 /* no need to tell driver, but set carrier and chanctx */ 1300 if (sdata->bss->active) { 1301 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1302 netif_carrier_on(dev); 1303 ieee80211_set_vif_encap_ops(sdata); 1304 } else { 1305 netif_carrier_off(dev); 1306 } 1307 break; 1308 case NL80211_IFTYPE_MONITOR: 1309 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1310 local->cooked_mntrs++; 1311 break; 1312 } 1313 1314 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1315 res = drv_add_interface(local, sdata); 1316 if (res) 1317 goto err_stop; 1318 } else if (local->monitors == 0 && local->open_count == 0) { 1319 res = ieee80211_add_virtual_monitor(local); 1320 if (res) 1321 goto err_stop; 1322 } 1323 1324 /* must be before the call to ieee80211_configure_filter */ 1325 local->monitors++; 1326 if (local->monitors == 1) { 1327 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1328 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1329 } 1330 1331 ieee80211_adjust_monitor_flags(sdata, 1); 1332 ieee80211_configure_filter(local); 1333 ieee80211_recalc_offload(local); 1334 ieee80211_recalc_idle(local); 1335 1336 netif_carrier_on(dev); 1337 break; 1338 default: 1339 if (coming_up) { 1340 ieee80211_del_virtual_monitor(local); 1341 ieee80211_set_sdata_offload_flags(sdata); 1342 1343 res = drv_add_interface(local, sdata); 1344 if (res) 1345 goto err_stop; 1346 1347 ieee80211_set_vif_encap_ops(sdata); 1348 res = ieee80211_check_queues(sdata, 1349 ieee80211_vif_type_p2p(&sdata->vif)); 1350 if (res) 1351 goto err_del_interface; 1352 } 1353 1354 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1355 local->fif_pspoll++; 1356 local->fif_probe_req++; 1357 1358 ieee80211_configure_filter(local); 1359 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1360 local->fif_probe_req++; 1361 } 1362 1363 if (sdata->vif.probe_req_reg) 1364 drv_config_iface_filter(local, sdata, 1365 FIF_PROBE_REQ, 1366 FIF_PROBE_REQ); 1367 1368 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1369 sdata->vif.type != NL80211_IFTYPE_NAN) 1370 changed |= ieee80211_reset_erp_info(sdata); 1371 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1372 changed); 1373 1374 switch (sdata->vif.type) { 1375 case NL80211_IFTYPE_STATION: 1376 case NL80211_IFTYPE_ADHOC: 1377 case NL80211_IFTYPE_AP: 1378 case NL80211_IFTYPE_MESH_POINT: 1379 case NL80211_IFTYPE_OCB: 1380 netif_carrier_off(dev); 1381 break; 1382 case NL80211_IFTYPE_P2P_DEVICE: 1383 case NL80211_IFTYPE_NAN: 1384 break; 1385 default: 1386 /* not reached */ 1387 WARN_ON(1); 1388 } 1389 1390 /* 1391 * Set default queue parameters so drivers don't 1392 * need to initialise the hardware if the hardware 1393 * doesn't start up with sane defaults. 1394 * Enable QoS for anything but station interfaces. 1395 */ 1396 ieee80211_set_wmm_default(&sdata->deflink, true, 1397 sdata->vif.type != NL80211_IFTYPE_STATION); 1398 } 1399 1400 switch (sdata->vif.type) { 1401 case NL80211_IFTYPE_P2P_DEVICE: 1402 rcu_assign_pointer(local->p2p_sdata, sdata); 1403 break; 1404 case NL80211_IFTYPE_MONITOR: 1405 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1406 break; 1407 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1408 break; 1409 default: 1410 break; 1411 } 1412 1413 /* 1414 * set_multicast_list will be invoked by the networking core 1415 * which will check whether any increments here were done in 1416 * error and sync them down to the hardware as filter flags. 1417 */ 1418 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1419 atomic_inc(&local->iff_allmultis); 1420 1421 if (coming_up) 1422 local->open_count++; 1423 1424 if (local->open_count == 1) 1425 ieee80211_hw_conf_init(local); 1426 else if (hw_reconf_flags) 1427 ieee80211_hw_config(local, hw_reconf_flags); 1428 1429 ieee80211_recalc_ps(local); 1430 1431 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1432 1433 return 0; 1434 err_del_interface: 1435 drv_remove_interface(local, sdata); 1436 err_stop: 1437 if (!local->open_count) 1438 drv_stop(local, false); 1439 err_del_bss: 1440 sdata->bss = NULL; 1441 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1442 list_del(&sdata->u.vlan.list); 1443 /* might already be clear but that doesn't matter */ 1444 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1445 return res; 1446 } 1447 1448 static void ieee80211_if_setup(struct net_device *dev) 1449 { 1450 ether_setup(dev); 1451 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1452 dev->priv_flags |= IFF_NO_QUEUE; 1453 dev->netdev_ops = &ieee80211_dataif_ops; 1454 dev->needs_free_netdev = true; 1455 } 1456 1457 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1458 struct ieee80211_sub_if_data *sdata, 1459 struct sk_buff *skb) 1460 { 1461 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1462 1463 lockdep_assert_wiphy(local->hw.wiphy); 1464 1465 if (ieee80211_is_action(mgmt->frame_control) && 1466 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1467 struct sta_info *sta; 1468 int len = skb->len; 1469 1470 sta = sta_info_get_bss(sdata, mgmt->sa); 1471 if (sta) { 1472 switch (mgmt->u.action.u.addba_req.action_code) { 1473 case WLAN_ACTION_ADDBA_REQ: 1474 ieee80211_process_addba_request(local, sta, 1475 mgmt, len); 1476 break; 1477 case WLAN_ACTION_ADDBA_RESP: 1478 ieee80211_process_addba_resp(local, sta, 1479 mgmt, len); 1480 break; 1481 case WLAN_ACTION_DELBA: 1482 ieee80211_process_delba(sdata, sta, 1483 mgmt, len); 1484 break; 1485 default: 1486 WARN_ON(1); 1487 break; 1488 } 1489 } 1490 } else if (ieee80211_is_action(mgmt->frame_control) && 1491 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1492 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1493 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1494 struct ieee80211_rx_status *status; 1495 enum nl80211_band band; 1496 struct sta_info *sta; 1497 u8 opmode; 1498 1499 status = IEEE80211_SKB_RXCB(skb); 1500 band = status->band; 1501 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1502 1503 sta = sta_info_get_bss(sdata, mgmt->sa); 1504 1505 if (sta) 1506 ieee80211_vht_handle_opmode(sdata, 1507 &sta->deflink, 1508 opmode, band); 1509 1510 break; 1511 } 1512 case WLAN_VHT_ACTION_GROUPID_MGMT: 1513 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1514 mgmt); 1515 break; 1516 default: 1517 WARN_ON(1); 1518 break; 1519 } 1520 } else if (ieee80211_is_action(mgmt->frame_control) && 1521 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1522 switch (mgmt->u.action.u.s1g.action_code) { 1523 case WLAN_S1G_TWT_TEARDOWN: 1524 case WLAN_S1G_TWT_SETUP: 1525 ieee80211_s1g_rx_twt_action(sdata, skb); 1526 break; 1527 default: 1528 break; 1529 } 1530 } else if (ieee80211_is_action(mgmt->frame_control) && 1531 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1532 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1533 switch (mgmt->u.action.u.ttlm_req.action_code) { 1534 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1535 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1536 skb->len); 1537 break; 1538 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1539 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1540 skb->len); 1541 break; 1542 default: 1543 break; 1544 } 1545 } 1546 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1547 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1548 ieee80211_sta_rx_queued_ext(sdata, skb); 1549 else 1550 WARN_ON(1); 1551 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1552 struct ieee80211_hdr *hdr = (void *)mgmt; 1553 struct sta_info *sta; 1554 1555 /* 1556 * So the frame isn't mgmt, but frame_control 1557 * is at the right place anyway, of course, so 1558 * the if statement is correct. 1559 * 1560 * Warn if we have other data frame types here, 1561 * they must not get here. 1562 */ 1563 WARN_ON(hdr->frame_control & 1564 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1565 WARN_ON(!(hdr->seq_ctrl & 1566 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1567 /* 1568 * This was a fragment of a frame, received while 1569 * a block-ack session was active. That cannot be 1570 * right, so terminate the session. 1571 */ 1572 sta = sta_info_get_bss(sdata, mgmt->sa); 1573 if (sta) { 1574 u16 tid = ieee80211_get_tid(hdr); 1575 1576 __ieee80211_stop_rx_ba_session( 1577 sta, tid, WLAN_BACK_RECIPIENT, 1578 WLAN_REASON_QSTA_REQUIRE_SETUP, 1579 true); 1580 } 1581 } else switch (sdata->vif.type) { 1582 case NL80211_IFTYPE_STATION: 1583 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1584 break; 1585 case NL80211_IFTYPE_ADHOC: 1586 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1587 break; 1588 case NL80211_IFTYPE_MESH_POINT: 1589 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1590 break; 1591 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1592 break; 1593 default: 1594 WARN(1, "frame for unexpected interface type"); 1595 break; 1596 } 1597 } 1598 1599 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1600 struct sk_buff *skb) 1601 { 1602 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1603 1604 if (ieee80211_is_action(mgmt->frame_control) && 1605 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1606 switch (mgmt->u.action.u.s1g.action_code) { 1607 case WLAN_S1G_TWT_TEARDOWN: 1608 case WLAN_S1G_TWT_SETUP: 1609 ieee80211_s1g_status_twt_action(sdata, skb); 1610 break; 1611 default: 1612 break; 1613 } 1614 } 1615 } 1616 1617 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1618 { 1619 struct ieee80211_sub_if_data *sdata = 1620 container_of(work, struct ieee80211_sub_if_data, work); 1621 struct ieee80211_local *local = sdata->local; 1622 struct sk_buff *skb; 1623 1624 if (!ieee80211_sdata_running(sdata)) 1625 return; 1626 1627 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1628 return; 1629 1630 if (!ieee80211_can_run_worker(local)) 1631 return; 1632 1633 /* first process frames */ 1634 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1635 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1636 1637 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1638 ieee80211_process_tdls_channel_switch(sdata, skb); 1639 else 1640 ieee80211_iface_process_skb(local, sdata, skb); 1641 1642 kfree_skb(skb); 1643 kcov_remote_stop(); 1644 } 1645 1646 /* process status queue */ 1647 while ((skb = skb_dequeue(&sdata->status_queue))) { 1648 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1649 1650 ieee80211_iface_process_status(sdata, skb); 1651 kfree_skb(skb); 1652 1653 kcov_remote_stop(); 1654 } 1655 1656 /* then other type-dependent work */ 1657 switch (sdata->vif.type) { 1658 case NL80211_IFTYPE_STATION: 1659 ieee80211_sta_work(sdata); 1660 break; 1661 case NL80211_IFTYPE_ADHOC: 1662 ieee80211_ibss_work(sdata); 1663 break; 1664 case NL80211_IFTYPE_MESH_POINT: 1665 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1666 break; 1667 ieee80211_mesh_work(sdata); 1668 break; 1669 case NL80211_IFTYPE_OCB: 1670 ieee80211_ocb_work(sdata); 1671 break; 1672 default: 1673 break; 1674 } 1675 } 1676 1677 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1678 struct wiphy_work *work) 1679 { 1680 struct ieee80211_sub_if_data *sdata = 1681 container_of(work, struct ieee80211_sub_if_data, 1682 activate_links_work); 1683 struct ieee80211_local *local = wiphy_priv(wiphy); 1684 1685 if (local->in_reconfig) 1686 return; 1687 1688 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1689 sdata->desired_active_links = 0; 1690 } 1691 1692 /* 1693 * Helper function to initialise an interface to a specific type. 1694 */ 1695 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1696 enum nl80211_iftype type) 1697 { 1698 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1699 0xff, 0xff, 0xff}; 1700 1701 /* clear type-dependent unions */ 1702 memset(&sdata->u, 0, sizeof(sdata->u)); 1703 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1704 1705 /* and set some type-dependent values */ 1706 sdata->vif.type = type; 1707 sdata->vif.p2p = false; 1708 sdata->wdev.iftype = type; 1709 1710 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1711 sdata->control_port_no_encrypt = false; 1712 sdata->control_port_over_nl80211 = false; 1713 sdata->control_port_no_preauth = false; 1714 sdata->vif.cfg.idle = true; 1715 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1716 1717 sdata->noack_map = 0; 1718 1719 /* only monitor/p2p-device differ */ 1720 if (sdata->dev) { 1721 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1722 sdata->dev->type = ARPHRD_ETHER; 1723 } 1724 1725 skb_queue_head_init(&sdata->skb_queue); 1726 skb_queue_head_init(&sdata->status_queue); 1727 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1728 wiphy_work_init(&sdata->activate_links_work, 1729 ieee80211_activate_links_work); 1730 wiphy_delayed_work_init(&sdata->dfs_cac_timer_work, 1731 ieee80211_dfs_cac_timer_work); 1732 1733 switch (type) { 1734 case NL80211_IFTYPE_P2P_GO: 1735 type = NL80211_IFTYPE_AP; 1736 sdata->vif.type = type; 1737 sdata->vif.p2p = true; 1738 fallthrough; 1739 case NL80211_IFTYPE_AP: 1740 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1741 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1742 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1743 break; 1744 case NL80211_IFTYPE_P2P_CLIENT: 1745 type = NL80211_IFTYPE_STATION; 1746 sdata->vif.type = type; 1747 sdata->vif.p2p = true; 1748 fallthrough; 1749 case NL80211_IFTYPE_STATION: 1750 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1751 ieee80211_sta_setup_sdata(sdata); 1752 break; 1753 case NL80211_IFTYPE_OCB: 1754 sdata->vif.bss_conf.bssid = bssid_wildcard; 1755 ieee80211_ocb_setup_sdata(sdata); 1756 break; 1757 case NL80211_IFTYPE_ADHOC: 1758 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1759 ieee80211_ibss_setup_sdata(sdata); 1760 break; 1761 case NL80211_IFTYPE_MESH_POINT: 1762 if (ieee80211_vif_is_mesh(&sdata->vif)) 1763 ieee80211_mesh_init_sdata(sdata); 1764 break; 1765 case NL80211_IFTYPE_MONITOR: 1766 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1767 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1768 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1769 MONITOR_FLAG_OTHER_BSS; 1770 break; 1771 case NL80211_IFTYPE_NAN: 1772 idr_init(&sdata->u.nan.function_inst_ids); 1773 spin_lock_init(&sdata->u.nan.func_lock); 1774 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1775 break; 1776 case NL80211_IFTYPE_AP_VLAN: 1777 case NL80211_IFTYPE_P2P_DEVICE: 1778 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1779 break; 1780 case NL80211_IFTYPE_UNSPECIFIED: 1781 case NL80211_IFTYPE_WDS: 1782 case NUM_NL80211_IFTYPES: 1783 WARN_ON(1); 1784 break; 1785 } 1786 1787 /* need to do this after the switch so vif.type is correct */ 1788 ieee80211_link_setup(&sdata->deflink); 1789 1790 ieee80211_debugfs_recreate_netdev(sdata, false); 1791 } 1792 1793 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1794 enum nl80211_iftype type) 1795 { 1796 struct ieee80211_local *local = sdata->local; 1797 int ret, err; 1798 enum nl80211_iftype internal_type = type; 1799 bool p2p = false; 1800 1801 ASSERT_RTNL(); 1802 1803 if (!local->ops->change_interface) 1804 return -EBUSY; 1805 1806 /* for now, don't support changing while links exist */ 1807 if (ieee80211_vif_is_mld(&sdata->vif)) 1808 return -EBUSY; 1809 1810 switch (sdata->vif.type) { 1811 case NL80211_IFTYPE_AP: 1812 if (!list_empty(&sdata->u.ap.vlans)) 1813 return -EBUSY; 1814 break; 1815 case NL80211_IFTYPE_STATION: 1816 case NL80211_IFTYPE_ADHOC: 1817 case NL80211_IFTYPE_OCB: 1818 /* 1819 * Could maybe also all others here? 1820 * Just not sure how that interacts 1821 * with the RX/config path e.g. for 1822 * mesh. 1823 */ 1824 break; 1825 default: 1826 return -EBUSY; 1827 } 1828 1829 switch (type) { 1830 case NL80211_IFTYPE_AP: 1831 case NL80211_IFTYPE_STATION: 1832 case NL80211_IFTYPE_ADHOC: 1833 case NL80211_IFTYPE_OCB: 1834 /* 1835 * Could probably support everything 1836 * but here. 1837 */ 1838 break; 1839 case NL80211_IFTYPE_P2P_CLIENT: 1840 p2p = true; 1841 internal_type = NL80211_IFTYPE_STATION; 1842 break; 1843 case NL80211_IFTYPE_P2P_GO: 1844 p2p = true; 1845 internal_type = NL80211_IFTYPE_AP; 1846 break; 1847 default: 1848 return -EBUSY; 1849 } 1850 1851 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1852 if (ret) 1853 return ret; 1854 1855 ieee80211_stop_vif_queues(local, sdata, 1856 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1857 /* do_stop will synchronize_rcu() first thing */ 1858 ieee80211_do_stop(sdata, false); 1859 1860 ieee80211_teardown_sdata(sdata); 1861 1862 ieee80211_set_sdata_offload_flags(sdata); 1863 ret = drv_change_interface(local, sdata, internal_type, p2p); 1864 if (ret) 1865 type = ieee80211_vif_type_p2p(&sdata->vif); 1866 1867 /* 1868 * Ignore return value here, there's not much we can do since 1869 * the driver changed the interface type internally already. 1870 * The warnings will hopefully make driver authors fix it :-) 1871 */ 1872 ieee80211_check_queues(sdata, type); 1873 1874 ieee80211_setup_sdata(sdata, type); 1875 ieee80211_set_vif_encap_ops(sdata); 1876 1877 err = ieee80211_do_open(&sdata->wdev, false); 1878 WARN(err, "type change: do_open returned %d", err); 1879 1880 ieee80211_wake_vif_queues(local, sdata, 1881 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1882 return ret; 1883 } 1884 1885 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1886 enum nl80211_iftype type) 1887 { 1888 int ret; 1889 1890 ASSERT_RTNL(); 1891 1892 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1893 return 0; 1894 1895 if (ieee80211_sdata_running(sdata)) { 1896 ret = ieee80211_runtime_change_iftype(sdata, type); 1897 if (ret) 1898 return ret; 1899 } else { 1900 /* Purge and reset type-dependent state. */ 1901 ieee80211_teardown_sdata(sdata); 1902 ieee80211_setup_sdata(sdata, type); 1903 } 1904 1905 /* reset some values that shouldn't be kept across type changes */ 1906 if (type == NL80211_IFTYPE_STATION) 1907 sdata->u.mgd.use_4addr = false; 1908 1909 return 0; 1910 } 1911 1912 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1913 u8 *perm_addr, enum nl80211_iftype type) 1914 { 1915 struct ieee80211_sub_if_data *sdata; 1916 u64 mask, start, addr, val, inc; 1917 u8 *m; 1918 u8 tmp_addr[ETH_ALEN]; 1919 int i; 1920 1921 lockdep_assert_wiphy(local->hw.wiphy); 1922 1923 /* default ... something at least */ 1924 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1925 1926 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1927 local->hw.wiphy->n_addresses <= 1) 1928 return; 1929 1930 switch (type) { 1931 case NL80211_IFTYPE_MONITOR: 1932 /* doesn't matter */ 1933 break; 1934 case NL80211_IFTYPE_AP_VLAN: 1935 /* match up with an AP interface */ 1936 list_for_each_entry(sdata, &local->interfaces, list) { 1937 if (sdata->vif.type != NL80211_IFTYPE_AP) 1938 continue; 1939 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1940 break; 1941 } 1942 /* keep default if no AP interface present */ 1943 break; 1944 case NL80211_IFTYPE_P2P_CLIENT: 1945 case NL80211_IFTYPE_P2P_GO: 1946 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1947 list_for_each_entry(sdata, &local->interfaces, list) { 1948 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1949 continue; 1950 if (!ieee80211_sdata_running(sdata)) 1951 continue; 1952 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1953 return; 1954 } 1955 } 1956 fallthrough; 1957 default: 1958 /* assign a new address if possible -- try n_addresses first */ 1959 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1960 bool used = false; 1961 1962 list_for_each_entry(sdata, &local->interfaces, list) { 1963 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1964 sdata->vif.addr)) { 1965 used = true; 1966 break; 1967 } 1968 } 1969 1970 if (!used) { 1971 memcpy(perm_addr, 1972 local->hw.wiphy->addresses[i].addr, 1973 ETH_ALEN); 1974 break; 1975 } 1976 } 1977 1978 /* try mask if available */ 1979 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1980 break; 1981 1982 m = local->hw.wiphy->addr_mask; 1983 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1984 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1985 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1986 1987 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1988 /* not a contiguous mask ... not handled now! */ 1989 pr_info("not contiguous\n"); 1990 break; 1991 } 1992 1993 /* 1994 * Pick address of existing interface in case user changed 1995 * MAC address manually, default to perm_addr. 1996 */ 1997 m = local->hw.wiphy->perm_addr; 1998 list_for_each_entry(sdata, &local->interfaces, list) { 1999 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2000 continue; 2001 m = sdata->vif.addr; 2002 break; 2003 } 2004 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2005 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2006 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2007 2008 inc = 1ULL<<__ffs64(mask); 2009 val = (start & mask); 2010 addr = (start & ~mask) | (val & mask); 2011 do { 2012 bool used = false; 2013 2014 tmp_addr[5] = addr >> 0*8; 2015 tmp_addr[4] = addr >> 1*8; 2016 tmp_addr[3] = addr >> 2*8; 2017 tmp_addr[2] = addr >> 3*8; 2018 tmp_addr[1] = addr >> 4*8; 2019 tmp_addr[0] = addr >> 5*8; 2020 2021 val += inc; 2022 2023 list_for_each_entry(sdata, &local->interfaces, list) { 2024 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2025 used = true; 2026 break; 2027 } 2028 } 2029 2030 if (!used) { 2031 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2032 break; 2033 } 2034 addr = (start & ~mask) | (val & mask); 2035 } while (addr != start); 2036 2037 break; 2038 } 2039 } 2040 2041 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2042 unsigned char name_assign_type, 2043 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2044 struct vif_params *params) 2045 { 2046 struct net_device *ndev = NULL; 2047 struct ieee80211_sub_if_data *sdata = NULL; 2048 struct txq_info *txqi; 2049 int ret, i; 2050 2051 ASSERT_RTNL(); 2052 lockdep_assert_wiphy(local->hw.wiphy); 2053 2054 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2055 struct wireless_dev *wdev; 2056 2057 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2058 GFP_KERNEL); 2059 if (!sdata) 2060 return -ENOMEM; 2061 wdev = &sdata->wdev; 2062 2063 sdata->dev = NULL; 2064 strscpy(sdata->name, name, IFNAMSIZ); 2065 ieee80211_assign_perm_addr(local, wdev->address, type); 2066 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2067 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2068 } else { 2069 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2070 sizeof(void *)); 2071 int txq_size = 0; 2072 2073 if (type != NL80211_IFTYPE_AP_VLAN && 2074 (type != NL80211_IFTYPE_MONITOR || 2075 (params->flags & MONITOR_FLAG_ACTIVE))) 2076 txq_size += sizeof(struct txq_info) + 2077 local->hw.txq_data_size; 2078 2079 ndev = alloc_netdev_mqs(size + txq_size, 2080 name, name_assign_type, 2081 ieee80211_if_setup, 1, 1); 2082 if (!ndev) 2083 return -ENOMEM; 2084 2085 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2086 2087 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2088 2089 ndev->needed_headroom = local->tx_headroom + 2090 4*6 /* four MAC addresses */ 2091 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2092 + 6 /* mesh */ 2093 + 8 /* rfc1042/bridge tunnel */ 2094 - ETH_HLEN /* ethernet hard_header_len */ 2095 + IEEE80211_ENCRYPT_HEADROOM; 2096 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2097 2098 ret = dev_alloc_name(ndev, ndev->name); 2099 if (ret < 0) { 2100 free_netdev(ndev); 2101 return ret; 2102 } 2103 2104 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2105 if (is_valid_ether_addr(params->macaddr)) 2106 eth_hw_addr_set(ndev, params->macaddr); 2107 else 2108 eth_hw_addr_set(ndev, ndev->perm_addr); 2109 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2110 2111 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2112 sdata = netdev_priv(ndev); 2113 ndev->ieee80211_ptr = &sdata->wdev; 2114 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2115 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2116 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2117 2118 if (txq_size) { 2119 txqi = netdev_priv(ndev) + size; 2120 ieee80211_txq_init(sdata, NULL, txqi, 0); 2121 } 2122 2123 sdata->dev = ndev; 2124 } 2125 2126 /* initialise type-independent data */ 2127 sdata->wdev.wiphy = local->hw.wiphy; 2128 2129 ieee80211_sdata_init(local, sdata); 2130 2131 ieee80211_init_frag_cache(&sdata->frags); 2132 2133 INIT_LIST_HEAD(&sdata->key_list); 2134 2135 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2136 ieee80211_delayed_tailroom_dec); 2137 2138 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2139 struct ieee80211_supported_band *sband; 2140 sband = local->hw.wiphy->bands[i]; 2141 sdata->rc_rateidx_mask[i] = 2142 sband ? (1 << sband->n_bitrates) - 1 : 0; 2143 if (sband) { 2144 __le16 cap; 2145 u16 *vht_rate_mask; 2146 2147 memcpy(sdata->rc_rateidx_mcs_mask[i], 2148 sband->ht_cap.mcs.rx_mask, 2149 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2150 2151 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2152 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2153 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2154 } else { 2155 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2156 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2157 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2158 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2159 } 2160 } 2161 2162 ieee80211_set_default_queues(sdata); 2163 2164 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2165 sdata->deflink.user_power_level = local->user_power_level; 2166 2167 /* setup type-dependent data */ 2168 ieee80211_setup_sdata(sdata, type); 2169 2170 if (ndev) { 2171 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2172 if (type == NL80211_IFTYPE_STATION) 2173 sdata->u.mgd.use_4addr = params->use_4addr; 2174 2175 ndev->features |= local->hw.netdev_features; 2176 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2177 ndev->hw_features |= ndev->features & 2178 MAC80211_SUPPORTED_FEATURES_TX; 2179 sdata->vif.netdev_features = local->hw.netdev_features; 2180 2181 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2182 2183 /* MTU range is normally 256 - 2304, where the upper limit is 2184 * the maximum MSDU size. Monitor interfaces send and receive 2185 * MPDU and A-MSDU frames which may be much larger so we do 2186 * not impose an upper limit in that case. 2187 */ 2188 ndev->min_mtu = 256; 2189 if (type == NL80211_IFTYPE_MONITOR) 2190 ndev->max_mtu = 0; 2191 else 2192 ndev->max_mtu = local->hw.max_mtu; 2193 2194 ret = cfg80211_register_netdevice(ndev); 2195 if (ret) { 2196 free_netdev(ndev); 2197 return ret; 2198 } 2199 } 2200 2201 mutex_lock(&local->iflist_mtx); 2202 list_add_tail_rcu(&sdata->list, &local->interfaces); 2203 mutex_unlock(&local->iflist_mtx); 2204 2205 if (new_wdev) 2206 *new_wdev = &sdata->wdev; 2207 2208 return 0; 2209 } 2210 2211 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2212 { 2213 ASSERT_RTNL(); 2214 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2215 2216 mutex_lock(&sdata->local->iflist_mtx); 2217 list_del_rcu(&sdata->list); 2218 mutex_unlock(&sdata->local->iflist_mtx); 2219 2220 if (sdata->vif.txq) 2221 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2222 2223 synchronize_rcu(); 2224 2225 cfg80211_unregister_wdev(&sdata->wdev); 2226 2227 if (!sdata->dev) { 2228 ieee80211_teardown_sdata(sdata); 2229 kfree(sdata); 2230 } 2231 } 2232 2233 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2234 { 2235 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2236 return; 2237 ieee80211_do_stop(sdata, true); 2238 } 2239 2240 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2241 { 2242 struct ieee80211_sub_if_data *sdata, *tmp; 2243 LIST_HEAD(unreg_list); 2244 2245 ASSERT_RTNL(); 2246 2247 /* Before destroying the interfaces, make sure they're all stopped so 2248 * that the hardware is stopped. Otherwise, the driver might still be 2249 * iterating the interfaces during the shutdown, e.g. from a worker 2250 * or from RX processing or similar, and if it does so (using atomic 2251 * iteration) while we're manipulating the list, the iteration will 2252 * crash. 2253 * 2254 * After this, the hardware should be stopped and the driver should 2255 * have stopped all of its activities, so that we can do RCU-unaware 2256 * manipulations of the interface list below. 2257 */ 2258 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2259 2260 wiphy_lock(local->hw.wiphy); 2261 2262 WARN(local->open_count, "%s: open count remains %d\n", 2263 wiphy_name(local->hw.wiphy), local->open_count); 2264 2265 mutex_lock(&local->iflist_mtx); 2266 list_splice_init(&local->interfaces, &unreg_list); 2267 mutex_unlock(&local->iflist_mtx); 2268 2269 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2270 bool netdev = sdata->dev; 2271 2272 /* 2273 * Remove IP addresses explicitly, since the notifier will 2274 * skip the callbacks if wdev->registered is false, since 2275 * we can't acquire the wiphy_lock() again there if already 2276 * inside this locked section. 2277 */ 2278 sdata->vif.cfg.arp_addr_cnt = 0; 2279 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2280 sdata->u.mgd.associated) 2281 ieee80211_vif_cfg_change_notify(sdata, 2282 BSS_CHANGED_ARP_FILTER); 2283 2284 list_del(&sdata->list); 2285 cfg80211_unregister_wdev(&sdata->wdev); 2286 2287 if (!netdev) 2288 kfree(sdata); 2289 } 2290 wiphy_unlock(local->hw.wiphy); 2291 } 2292 2293 static int netdev_notify(struct notifier_block *nb, 2294 unsigned long state, void *ptr) 2295 { 2296 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2297 struct ieee80211_sub_if_data *sdata; 2298 2299 if (state != NETDEV_CHANGENAME) 2300 return NOTIFY_DONE; 2301 2302 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2303 return NOTIFY_DONE; 2304 2305 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2306 return NOTIFY_DONE; 2307 2308 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2309 memcpy(sdata->name, dev->name, IFNAMSIZ); 2310 ieee80211_debugfs_rename_netdev(sdata); 2311 2312 return NOTIFY_OK; 2313 } 2314 2315 static struct notifier_block mac80211_netdev_notifier = { 2316 .notifier_call = netdev_notify, 2317 }; 2318 2319 int ieee80211_iface_init(void) 2320 { 2321 return register_netdevice_notifier(&mac80211_netdev_notifier); 2322 } 2323 2324 void ieee80211_iface_exit(void) 2325 { 2326 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2327 } 2328 2329 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2330 { 2331 if (sdata->vif.type == NL80211_IFTYPE_AP) 2332 atomic_inc(&sdata->u.ap.num_mcast_sta); 2333 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2334 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2335 } 2336 2337 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2338 { 2339 if (sdata->vif.type == NL80211_IFTYPE_AP) 2340 atomic_dec(&sdata->u.ap.num_mcast_sta); 2341 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2342 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2343 } 2344 2345 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2346 { 2347 struct ieee80211_local *local = sdata->local; 2348 2349 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2350 return; 2351 2352 ieee80211_stop_vif_queues(local, sdata, 2353 IEEE80211_QUEUE_STOP_REASON_CSA); 2354 sdata->csa_blocked_queues = true; 2355 } 2356 2357 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2358 { 2359 struct ieee80211_local *local = sdata->local; 2360 2361 if (sdata->csa_blocked_queues) { 2362 ieee80211_wake_vif_queues(local, sdata, 2363 IEEE80211_QUEUE_STOP_REASON_CSA); 2364 sdata->csa_blocked_queues = false; 2365 } 2366 } 2367