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, -1); 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 ieee80211_recalc_offload(local); 686 687 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 688 break; 689 690 fallthrough; 691 default: 692 if (!going_down) 693 break; 694 drv_remove_interface(local, sdata); 695 696 /* Clear private driver data to prevent reuse */ 697 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); 698 } 699 700 ieee80211_recalc_ps(local); 701 702 if (cancel_scan) 703 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 704 705 if (local->open_count == 0) { 706 ieee80211_stop_device(local, false); 707 708 /* no reconfiguring after stop! */ 709 return; 710 } 711 712 /* do after stop to avoid reconfiguring when we stop anyway */ 713 ieee80211_configure_filter(local); 714 ieee80211_hw_config(local, hw_reconf_flags); 715 716 if (local->monitors == local->open_count) 717 ieee80211_add_virtual_monitor(local); 718 } 719 720 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 721 { 722 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 723 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 724 725 if (!tx_vif) 726 return; 727 728 tx_sdata = vif_to_sdata(tx_vif); 729 sdata->vif.mbssid_tx_vif = NULL; 730 731 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 732 &tx_sdata->local->interfaces, list) { 733 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 734 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 735 ieee80211_sdata_running(non_tx_sdata)) { 736 non_tx_sdata->vif.mbssid_tx_vif = NULL; 737 dev_close(non_tx_sdata->wdev.netdev); 738 } 739 } 740 741 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 742 tx_sdata->vif.mbssid_tx_vif = NULL; 743 dev_close(tx_sdata->wdev.netdev); 744 } 745 } 746 747 static int ieee80211_stop(struct net_device *dev) 748 { 749 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 750 751 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 752 if (sdata->vif.type == NL80211_IFTYPE_AP) { 753 struct ieee80211_sub_if_data *vlan, *tmpsdata; 754 755 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 756 u.vlan.list) 757 dev_close(vlan->dev); 758 759 ieee80211_stop_mbssid(sdata); 760 } 761 762 wiphy_lock(sdata->local->hw.wiphy); 763 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 764 765 ieee80211_do_stop(sdata, true); 766 wiphy_unlock(sdata->local->hw.wiphy); 767 768 return 0; 769 } 770 771 static void ieee80211_set_multicast_list(struct net_device *dev) 772 { 773 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 774 struct ieee80211_local *local = sdata->local; 775 int allmulti, sdata_allmulti; 776 777 allmulti = !!(dev->flags & IFF_ALLMULTI); 778 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 779 780 if (allmulti != sdata_allmulti) { 781 if (dev->flags & IFF_ALLMULTI) 782 atomic_inc(&local->iff_allmultis); 783 else 784 atomic_dec(&local->iff_allmultis); 785 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 786 } 787 788 spin_lock_bh(&local->filter_lock); 789 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 790 spin_unlock_bh(&local->filter_lock); 791 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 792 } 793 794 /* 795 * Called when the netdev is removed or, by the code below, before 796 * the interface type changes. 797 */ 798 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 799 { 800 /* free extra data */ 801 ieee80211_free_keys(sdata, false); 802 803 ieee80211_debugfs_remove_netdev(sdata); 804 805 ieee80211_destroy_frag_cache(&sdata->frags); 806 807 if (ieee80211_vif_is_mesh(&sdata->vif)) 808 ieee80211_mesh_teardown_sdata(sdata); 809 810 ieee80211_vif_clear_links(sdata); 811 ieee80211_link_stop(&sdata->deflink); 812 } 813 814 static void ieee80211_uninit(struct net_device *dev) 815 { 816 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 817 } 818 819 static int ieee80211_netdev_setup_tc(struct net_device *dev, 820 enum tc_setup_type type, void *type_data) 821 { 822 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 823 struct ieee80211_local *local = sdata->local; 824 825 return drv_net_setup_tc(local, sdata, dev, type, type_data); 826 } 827 828 static const struct net_device_ops ieee80211_dataif_ops = { 829 .ndo_open = ieee80211_open, 830 .ndo_stop = ieee80211_stop, 831 .ndo_uninit = ieee80211_uninit, 832 .ndo_start_xmit = ieee80211_subif_start_xmit, 833 .ndo_set_rx_mode = ieee80211_set_multicast_list, 834 .ndo_set_mac_address = ieee80211_change_mac, 835 .ndo_setup_tc = ieee80211_netdev_setup_tc, 836 }; 837 838 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 839 struct sk_buff *skb, 840 struct net_device *sb_dev) 841 { 842 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 843 struct ieee80211_local *local = sdata->local; 844 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 845 struct ieee80211_hdr *hdr; 846 int len_rthdr; 847 848 if (local->hw.queues < IEEE80211_NUM_ACS) 849 return 0; 850 851 /* reset flags and info before parsing radiotap header */ 852 memset(info, 0, sizeof(*info)); 853 854 if (!ieee80211_parse_tx_radiotap(skb, dev)) 855 return 0; /* doesn't matter, frame will be dropped */ 856 857 len_rthdr = ieee80211_get_radiotap_len(skb->data); 858 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 859 if (skb->len < len_rthdr + 2 || 860 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 861 return 0; /* doesn't matter, frame will be dropped */ 862 863 return ieee80211_select_queue_80211(sdata, skb, hdr); 864 } 865 866 static const struct net_device_ops ieee80211_monitorif_ops = { 867 .ndo_open = ieee80211_open, 868 .ndo_stop = ieee80211_stop, 869 .ndo_uninit = ieee80211_uninit, 870 .ndo_start_xmit = ieee80211_monitor_start_xmit, 871 .ndo_set_rx_mode = ieee80211_set_multicast_list, 872 .ndo_set_mac_address = ieee80211_change_mac, 873 .ndo_select_queue = ieee80211_monitor_select_queue, 874 }; 875 876 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 877 struct net_device_path *path) 878 { 879 struct ieee80211_sub_if_data *sdata; 880 struct ieee80211_local *local; 881 struct sta_info *sta; 882 int ret = -ENOENT; 883 884 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 885 local = sdata->local; 886 887 if (!local->ops->net_fill_forward_path) 888 return -EOPNOTSUPP; 889 890 rcu_read_lock(); 891 switch (sdata->vif.type) { 892 case NL80211_IFTYPE_AP_VLAN: 893 sta = rcu_dereference(sdata->u.vlan.sta); 894 if (sta) 895 break; 896 if (sdata->wdev.use_4addr) 897 goto out; 898 if (is_multicast_ether_addr(ctx->daddr)) 899 goto out; 900 sta = sta_info_get_bss(sdata, ctx->daddr); 901 break; 902 case NL80211_IFTYPE_AP: 903 if (is_multicast_ether_addr(ctx->daddr)) 904 goto out; 905 sta = sta_info_get(sdata, ctx->daddr); 906 break; 907 case NL80211_IFTYPE_STATION: 908 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 909 sta = sta_info_get(sdata, ctx->daddr); 910 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 911 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 912 goto out; 913 914 break; 915 } 916 } 917 918 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 919 break; 920 default: 921 goto out; 922 } 923 924 if (!sta) 925 goto out; 926 927 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 928 out: 929 rcu_read_unlock(); 930 931 return ret; 932 } 933 934 static const struct net_device_ops ieee80211_dataif_8023_ops = { 935 .ndo_open = ieee80211_open, 936 .ndo_stop = ieee80211_stop, 937 .ndo_uninit = ieee80211_uninit, 938 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 939 .ndo_set_rx_mode = ieee80211_set_multicast_list, 940 .ndo_set_mac_address = ieee80211_change_mac, 941 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 942 .ndo_setup_tc = ieee80211_netdev_setup_tc, 943 }; 944 945 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 946 { 947 switch (iftype) { 948 /* P2P GO and client are mapped to AP/STATION types */ 949 case NL80211_IFTYPE_AP: 950 case NL80211_IFTYPE_STATION: 951 return true; 952 default: 953 return false; 954 } 955 } 956 957 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 958 { 959 struct ieee80211_local *local = sdata->local; 960 u32 flags; 961 962 flags = sdata->vif.offload_flags; 963 964 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 965 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 966 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 967 968 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 969 local->hw.wiphy->frag_threshold != (u32)-1) 970 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 971 972 if (local->monitors) 973 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 974 } else { 975 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 976 } 977 978 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 979 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 980 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 981 982 if (local->monitors && 983 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 984 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 985 } else { 986 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 987 } 988 989 if (sdata->vif.offload_flags == flags) 990 return false; 991 992 sdata->vif.offload_flags = flags; 993 ieee80211_check_fast_rx_iface(sdata); 994 return true; 995 } 996 997 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 998 { 999 struct ieee80211_local *local = sdata->local; 1000 struct ieee80211_sub_if_data *bss = sdata; 1001 bool enabled; 1002 1003 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1004 if (!sdata->bss) 1005 return; 1006 1007 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1008 } 1009 1010 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1011 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1012 return; 1013 1014 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1015 if (sdata->wdev.use_4addr && 1016 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1017 enabled = false; 1018 1019 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1020 &ieee80211_dataif_ops; 1021 } 1022 1023 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1024 { 1025 struct ieee80211_local *local = sdata->local; 1026 struct ieee80211_sub_if_data *vsdata; 1027 1028 if (ieee80211_set_sdata_offload_flags(sdata)) { 1029 drv_update_vif_offload(local, sdata); 1030 ieee80211_set_vif_encap_ops(sdata); 1031 } 1032 1033 list_for_each_entry(vsdata, &local->interfaces, list) { 1034 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1035 vsdata->bss != &sdata->u.ap) 1036 continue; 1037 1038 ieee80211_set_vif_encap_ops(vsdata); 1039 } 1040 } 1041 1042 void ieee80211_recalc_offload(struct ieee80211_local *local) 1043 { 1044 struct ieee80211_sub_if_data *sdata; 1045 1046 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1047 return; 1048 1049 lockdep_assert_wiphy(local->hw.wiphy); 1050 1051 list_for_each_entry(sdata, &local->interfaces, list) { 1052 if (!ieee80211_sdata_running(sdata)) 1053 continue; 1054 1055 ieee80211_recalc_sdata_offload(sdata); 1056 } 1057 } 1058 1059 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1060 const int offset) 1061 { 1062 struct ieee80211_local *local = sdata->local; 1063 u32 flags = sdata->u.mntr.flags; 1064 1065 #define ADJUST(_f, _s) do { \ 1066 if (flags & MONITOR_FLAG_##_f) \ 1067 local->fif_##_s += offset; \ 1068 } while (0) 1069 1070 ADJUST(FCSFAIL, fcsfail); 1071 ADJUST(PLCPFAIL, plcpfail); 1072 ADJUST(CONTROL, control); 1073 ADJUST(CONTROL, pspoll); 1074 ADJUST(OTHER_BSS, other_bss); 1075 1076 #undef ADJUST 1077 } 1078 1079 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1080 { 1081 struct ieee80211_local *local = sdata->local; 1082 int i; 1083 1084 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1085 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1086 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1087 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1088 sdata->vif.hw_queue[i] = i; 1089 else 1090 sdata->vif.hw_queue[i] = 0; 1091 } 1092 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1093 } 1094 1095 static void ieee80211_sdata_init(struct ieee80211_local *local, 1096 struct ieee80211_sub_if_data *sdata) 1097 { 1098 sdata->local = local; 1099 1100 /* 1101 * Initialize the default link, so we can use link_id 0 for non-MLD, 1102 * and that continues to work for non-MLD-aware drivers that use just 1103 * vif.bss_conf instead of vif.link_conf. 1104 * 1105 * Note that we never change this, so if link ID 0 isn't used in an 1106 * MLD connection, we get a separate allocation for it. 1107 */ 1108 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1109 } 1110 1111 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1112 { 1113 struct ieee80211_sub_if_data *sdata; 1114 int ret; 1115 1116 ASSERT_RTNL(); 1117 lockdep_assert_wiphy(local->hw.wiphy); 1118 1119 if (local->monitor_sdata) 1120 return 0; 1121 1122 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1123 if (!sdata) 1124 return -ENOMEM; 1125 1126 /* set up data */ 1127 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1128 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1129 wiphy_name(local->hw.wiphy)); 1130 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1131 sdata->wdev.wiphy = local->hw.wiphy; 1132 1133 ieee80211_sdata_init(local, sdata); 1134 1135 ieee80211_set_default_queues(sdata); 1136 1137 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1138 ret = drv_add_interface(local, sdata); 1139 if (WARN_ON(ret)) { 1140 /* ok .. stupid driver, it asked for this! */ 1141 kfree(sdata); 1142 return ret; 1143 } 1144 } 1145 1146 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1147 1148 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1149 if (ret) { 1150 kfree(sdata); 1151 return ret; 1152 } 1153 1154 mutex_lock(&local->iflist_mtx); 1155 rcu_assign_pointer(local->monitor_sdata, sdata); 1156 mutex_unlock(&local->iflist_mtx); 1157 1158 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1159 IEEE80211_CHANCTX_EXCLUSIVE); 1160 if (ret) { 1161 mutex_lock(&local->iflist_mtx); 1162 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1163 mutex_unlock(&local->iflist_mtx); 1164 synchronize_net(); 1165 drv_remove_interface(local, sdata); 1166 kfree(sdata); 1167 return ret; 1168 } 1169 1170 skb_queue_head_init(&sdata->skb_queue); 1171 skb_queue_head_init(&sdata->status_queue); 1172 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1173 1174 return 0; 1175 } 1176 1177 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1178 { 1179 struct ieee80211_sub_if_data *sdata; 1180 1181 ASSERT_RTNL(); 1182 lockdep_assert_wiphy(local->hw.wiphy); 1183 1184 mutex_lock(&local->iflist_mtx); 1185 1186 sdata = rcu_dereference_protected(local->monitor_sdata, 1187 lockdep_is_held(&local->iflist_mtx)); 1188 if (!sdata) { 1189 mutex_unlock(&local->iflist_mtx); 1190 return; 1191 } 1192 1193 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1194 mutex_unlock(&local->iflist_mtx); 1195 1196 synchronize_net(); 1197 1198 ieee80211_link_release_channel(&sdata->deflink); 1199 1200 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1201 drv_remove_interface(local, sdata); 1202 1203 kfree(sdata); 1204 } 1205 1206 /* 1207 * NOTE: Be very careful when changing this function, it must NOT return 1208 * an error on interface type changes that have been pre-checked, so most 1209 * checks should be in ieee80211_check_concurrent_iface. 1210 */ 1211 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1212 { 1213 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1214 struct net_device *dev = wdev->netdev; 1215 struct ieee80211_local *local = sdata->local; 1216 u64 changed = 0; 1217 int res; 1218 u32 hw_reconf_flags = 0; 1219 1220 lockdep_assert_wiphy(local->hw.wiphy); 1221 1222 switch (sdata->vif.type) { 1223 case NL80211_IFTYPE_AP_VLAN: { 1224 struct ieee80211_sub_if_data *master; 1225 1226 if (!sdata->bss) 1227 return -ENOLINK; 1228 1229 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1230 1231 master = container_of(sdata->bss, 1232 struct ieee80211_sub_if_data, u.ap); 1233 sdata->control_port_protocol = 1234 master->control_port_protocol; 1235 sdata->control_port_no_encrypt = 1236 master->control_port_no_encrypt; 1237 sdata->control_port_over_nl80211 = 1238 master->control_port_over_nl80211; 1239 sdata->control_port_no_preauth = 1240 master->control_port_no_preauth; 1241 sdata->vif.cab_queue = master->vif.cab_queue; 1242 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1243 sizeof(sdata->vif.hw_queue)); 1244 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1245 1246 sdata->crypto_tx_tailroom_needed_cnt += 1247 master->crypto_tx_tailroom_needed_cnt; 1248 1249 break; 1250 } 1251 case NL80211_IFTYPE_AP: 1252 sdata->bss = &sdata->u.ap; 1253 break; 1254 case NL80211_IFTYPE_MESH_POINT: 1255 case NL80211_IFTYPE_STATION: 1256 case NL80211_IFTYPE_MONITOR: 1257 case NL80211_IFTYPE_ADHOC: 1258 case NL80211_IFTYPE_P2P_DEVICE: 1259 case NL80211_IFTYPE_OCB: 1260 case NL80211_IFTYPE_NAN: 1261 /* no special treatment */ 1262 break; 1263 case NL80211_IFTYPE_UNSPECIFIED: 1264 case NUM_NL80211_IFTYPES: 1265 case NL80211_IFTYPE_P2P_CLIENT: 1266 case NL80211_IFTYPE_P2P_GO: 1267 case NL80211_IFTYPE_WDS: 1268 /* cannot happen */ 1269 WARN_ON(1); 1270 break; 1271 } 1272 1273 if (local->open_count == 0) { 1274 /* here we can consider everything in good order (again) */ 1275 local->reconfig_failure = false; 1276 1277 res = drv_start(local); 1278 if (res) 1279 goto err_del_bss; 1280 ieee80211_led_radio(local, true); 1281 ieee80211_mod_tpt_led_trig(local, 1282 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1283 } 1284 1285 /* 1286 * Copy the hopefully now-present MAC address to 1287 * this interface, if it has the special null one. 1288 */ 1289 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1290 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1291 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1292 1293 if (!is_valid_ether_addr(dev->dev_addr)) { 1294 res = -EADDRNOTAVAIL; 1295 goto err_stop; 1296 } 1297 } 1298 1299 switch (sdata->vif.type) { 1300 case NL80211_IFTYPE_AP_VLAN: 1301 /* no need to tell driver, but set carrier and chanctx */ 1302 if (sdata->bss->active) { 1303 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1304 netif_carrier_on(dev); 1305 ieee80211_set_vif_encap_ops(sdata); 1306 } else { 1307 netif_carrier_off(dev); 1308 } 1309 break; 1310 case NL80211_IFTYPE_MONITOR: 1311 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1312 local->cooked_mntrs++; 1313 break; 1314 } 1315 1316 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1317 res = drv_add_interface(local, sdata); 1318 if (res) 1319 goto err_stop; 1320 } else if (local->monitors == 0 && local->open_count == 0) { 1321 res = ieee80211_add_virtual_monitor(local); 1322 if (res) 1323 goto err_stop; 1324 } 1325 1326 /* must be before the call to ieee80211_configure_filter */ 1327 local->monitors++; 1328 if (local->monitors == 1) { 1329 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1330 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1331 } 1332 1333 ieee80211_adjust_monitor_flags(sdata, 1); 1334 ieee80211_configure_filter(local); 1335 ieee80211_recalc_offload(local); 1336 ieee80211_recalc_idle(local); 1337 1338 netif_carrier_on(dev); 1339 break; 1340 default: 1341 if (coming_up) { 1342 ieee80211_del_virtual_monitor(local); 1343 ieee80211_set_sdata_offload_flags(sdata); 1344 1345 res = drv_add_interface(local, sdata); 1346 if (res) 1347 goto err_stop; 1348 1349 ieee80211_set_vif_encap_ops(sdata); 1350 res = ieee80211_check_queues(sdata, 1351 ieee80211_vif_type_p2p(&sdata->vif)); 1352 if (res) 1353 goto err_del_interface; 1354 } 1355 1356 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1357 local->fif_pspoll++; 1358 local->fif_probe_req++; 1359 1360 ieee80211_configure_filter(local); 1361 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1362 local->fif_probe_req++; 1363 } 1364 1365 if (sdata->vif.probe_req_reg) 1366 drv_config_iface_filter(local, sdata, 1367 FIF_PROBE_REQ, 1368 FIF_PROBE_REQ); 1369 1370 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1371 sdata->vif.type != NL80211_IFTYPE_NAN) 1372 changed |= ieee80211_reset_erp_info(sdata); 1373 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1374 changed); 1375 1376 switch (sdata->vif.type) { 1377 case NL80211_IFTYPE_STATION: 1378 case NL80211_IFTYPE_ADHOC: 1379 case NL80211_IFTYPE_AP: 1380 case NL80211_IFTYPE_MESH_POINT: 1381 case NL80211_IFTYPE_OCB: 1382 netif_carrier_off(dev); 1383 break; 1384 case NL80211_IFTYPE_P2P_DEVICE: 1385 case NL80211_IFTYPE_NAN: 1386 break; 1387 default: 1388 /* not reached */ 1389 WARN_ON(1); 1390 } 1391 1392 /* 1393 * Set default queue parameters so drivers don't 1394 * need to initialise the hardware if the hardware 1395 * doesn't start up with sane defaults. 1396 * Enable QoS for anything but station interfaces. 1397 */ 1398 ieee80211_set_wmm_default(&sdata->deflink, true, 1399 sdata->vif.type != NL80211_IFTYPE_STATION); 1400 } 1401 1402 switch (sdata->vif.type) { 1403 case NL80211_IFTYPE_P2P_DEVICE: 1404 rcu_assign_pointer(local->p2p_sdata, sdata); 1405 break; 1406 case NL80211_IFTYPE_MONITOR: 1407 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1408 break; 1409 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1410 break; 1411 default: 1412 break; 1413 } 1414 1415 /* 1416 * set_multicast_list will be invoked by the networking core 1417 * which will check whether any increments here were done in 1418 * error and sync them down to the hardware as filter flags. 1419 */ 1420 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1421 atomic_inc(&local->iff_allmultis); 1422 1423 if (coming_up) 1424 local->open_count++; 1425 1426 if (local->open_count == 1) 1427 ieee80211_hw_conf_init(local); 1428 else if (hw_reconf_flags) 1429 ieee80211_hw_config(local, hw_reconf_flags); 1430 1431 ieee80211_recalc_ps(local); 1432 1433 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1434 1435 return 0; 1436 err_del_interface: 1437 drv_remove_interface(local, sdata); 1438 err_stop: 1439 if (!local->open_count) 1440 drv_stop(local, false); 1441 err_del_bss: 1442 sdata->bss = NULL; 1443 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1444 list_del(&sdata->u.vlan.list); 1445 /* might already be clear but that doesn't matter */ 1446 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1447 return res; 1448 } 1449 1450 static void ieee80211_if_setup(struct net_device *dev) 1451 { 1452 ether_setup(dev); 1453 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1454 dev->priv_flags |= IFF_NO_QUEUE; 1455 dev->netdev_ops = &ieee80211_dataif_ops; 1456 dev->needs_free_netdev = true; 1457 } 1458 1459 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1460 struct ieee80211_sub_if_data *sdata, 1461 struct sk_buff *skb) 1462 { 1463 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1464 1465 lockdep_assert_wiphy(local->hw.wiphy); 1466 1467 if (ieee80211_is_action(mgmt->frame_control) && 1468 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1469 struct sta_info *sta; 1470 int len = skb->len; 1471 1472 sta = sta_info_get_bss(sdata, mgmt->sa); 1473 if (sta) { 1474 switch (mgmt->u.action.u.addba_req.action_code) { 1475 case WLAN_ACTION_ADDBA_REQ: 1476 ieee80211_process_addba_request(local, sta, 1477 mgmt, len); 1478 break; 1479 case WLAN_ACTION_ADDBA_RESP: 1480 ieee80211_process_addba_resp(local, sta, 1481 mgmt, len); 1482 break; 1483 case WLAN_ACTION_DELBA: 1484 ieee80211_process_delba(sdata, sta, 1485 mgmt, len); 1486 break; 1487 default: 1488 WARN_ON(1); 1489 break; 1490 } 1491 } 1492 } else if (ieee80211_is_action(mgmt->frame_control) && 1493 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1494 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1495 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1496 struct ieee80211_rx_status *status; 1497 enum nl80211_band band; 1498 struct sta_info *sta; 1499 u8 opmode; 1500 1501 status = IEEE80211_SKB_RXCB(skb); 1502 band = status->band; 1503 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1504 1505 sta = sta_info_get_bss(sdata, mgmt->sa); 1506 1507 if (sta) 1508 ieee80211_vht_handle_opmode(sdata, 1509 &sta->deflink, 1510 opmode, band); 1511 1512 break; 1513 } 1514 case WLAN_VHT_ACTION_GROUPID_MGMT: 1515 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1516 mgmt); 1517 break; 1518 default: 1519 WARN_ON(1); 1520 break; 1521 } 1522 } else if (ieee80211_is_action(mgmt->frame_control) && 1523 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1524 switch (mgmt->u.action.u.s1g.action_code) { 1525 case WLAN_S1G_TWT_TEARDOWN: 1526 case WLAN_S1G_TWT_SETUP: 1527 ieee80211_s1g_rx_twt_action(sdata, skb); 1528 break; 1529 default: 1530 break; 1531 } 1532 } else if (ieee80211_is_action(mgmt->frame_control) && 1533 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1534 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1535 switch (mgmt->u.action.u.ttlm_req.action_code) { 1536 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1537 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1538 skb->len); 1539 break; 1540 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1541 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1542 skb->len); 1543 break; 1544 default: 1545 break; 1546 } 1547 } 1548 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1549 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1550 ieee80211_sta_rx_queued_ext(sdata, skb); 1551 else 1552 WARN_ON(1); 1553 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1554 struct ieee80211_hdr *hdr = (void *)mgmt; 1555 struct sta_info *sta; 1556 1557 /* 1558 * So the frame isn't mgmt, but frame_control 1559 * is at the right place anyway, of course, so 1560 * the if statement is correct. 1561 * 1562 * Warn if we have other data frame types here, 1563 * they must not get here. 1564 */ 1565 WARN_ON(hdr->frame_control & 1566 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1567 WARN_ON(!(hdr->seq_ctrl & 1568 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1569 /* 1570 * This was a fragment of a frame, received while 1571 * a block-ack session was active. That cannot be 1572 * right, so terminate the session. 1573 */ 1574 sta = sta_info_get_bss(sdata, mgmt->sa); 1575 if (sta) { 1576 u16 tid = ieee80211_get_tid(hdr); 1577 1578 __ieee80211_stop_rx_ba_session( 1579 sta, tid, WLAN_BACK_RECIPIENT, 1580 WLAN_REASON_QSTA_REQUIRE_SETUP, 1581 true); 1582 } 1583 } else switch (sdata->vif.type) { 1584 case NL80211_IFTYPE_STATION: 1585 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1586 break; 1587 case NL80211_IFTYPE_ADHOC: 1588 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1589 break; 1590 case NL80211_IFTYPE_MESH_POINT: 1591 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1592 break; 1593 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1594 break; 1595 default: 1596 WARN(1, "frame for unexpected interface type"); 1597 break; 1598 } 1599 } 1600 1601 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1602 struct sk_buff *skb) 1603 { 1604 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1605 1606 if (ieee80211_is_action(mgmt->frame_control) && 1607 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1608 switch (mgmt->u.action.u.s1g.action_code) { 1609 case WLAN_S1G_TWT_TEARDOWN: 1610 case WLAN_S1G_TWT_SETUP: 1611 ieee80211_s1g_status_twt_action(sdata, skb); 1612 break; 1613 default: 1614 break; 1615 } 1616 } 1617 } 1618 1619 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1620 { 1621 struct ieee80211_sub_if_data *sdata = 1622 container_of(work, struct ieee80211_sub_if_data, work); 1623 struct ieee80211_local *local = sdata->local; 1624 struct sk_buff *skb; 1625 1626 if (!ieee80211_sdata_running(sdata)) 1627 return; 1628 1629 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1630 return; 1631 1632 if (!ieee80211_can_run_worker(local)) 1633 return; 1634 1635 /* first process frames */ 1636 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1637 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1638 1639 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1640 ieee80211_process_tdls_channel_switch(sdata, skb); 1641 else 1642 ieee80211_iface_process_skb(local, sdata, skb); 1643 1644 kfree_skb(skb); 1645 kcov_remote_stop(); 1646 } 1647 1648 /* process status queue */ 1649 while ((skb = skb_dequeue(&sdata->status_queue))) { 1650 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1651 1652 ieee80211_iface_process_status(sdata, skb); 1653 kfree_skb(skb); 1654 1655 kcov_remote_stop(); 1656 } 1657 1658 /* then other type-dependent work */ 1659 switch (sdata->vif.type) { 1660 case NL80211_IFTYPE_STATION: 1661 ieee80211_sta_work(sdata); 1662 break; 1663 case NL80211_IFTYPE_ADHOC: 1664 ieee80211_ibss_work(sdata); 1665 break; 1666 case NL80211_IFTYPE_MESH_POINT: 1667 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1668 break; 1669 ieee80211_mesh_work(sdata); 1670 break; 1671 case NL80211_IFTYPE_OCB: 1672 ieee80211_ocb_work(sdata); 1673 break; 1674 default: 1675 break; 1676 } 1677 } 1678 1679 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1680 struct wiphy_work *work) 1681 { 1682 struct ieee80211_sub_if_data *sdata = 1683 container_of(work, struct ieee80211_sub_if_data, 1684 activate_links_work); 1685 struct ieee80211_local *local = wiphy_priv(wiphy); 1686 1687 if (local->in_reconfig) 1688 return; 1689 1690 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1691 sdata->desired_active_links = 0; 1692 } 1693 1694 /* 1695 * Helper function to initialise an interface to a specific type. 1696 */ 1697 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1698 enum nl80211_iftype type) 1699 { 1700 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1701 0xff, 0xff, 0xff}; 1702 1703 /* clear type-dependent unions */ 1704 memset(&sdata->u, 0, sizeof(sdata->u)); 1705 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1706 1707 /* and set some type-dependent values */ 1708 sdata->vif.type = type; 1709 sdata->vif.p2p = false; 1710 sdata->wdev.iftype = type; 1711 1712 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1713 sdata->control_port_no_encrypt = false; 1714 sdata->control_port_over_nl80211 = false; 1715 sdata->control_port_no_preauth = false; 1716 sdata->vif.cfg.idle = true; 1717 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1718 1719 sdata->noack_map = 0; 1720 1721 /* only monitor/p2p-device differ */ 1722 if (sdata->dev) { 1723 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1724 sdata->dev->type = ARPHRD_ETHER; 1725 } 1726 1727 skb_queue_head_init(&sdata->skb_queue); 1728 skb_queue_head_init(&sdata->status_queue); 1729 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1730 wiphy_work_init(&sdata->activate_links_work, 1731 ieee80211_activate_links_work); 1732 wiphy_delayed_work_init(&sdata->dfs_cac_timer_work, 1733 ieee80211_dfs_cac_timer_work); 1734 1735 switch (type) { 1736 case NL80211_IFTYPE_P2P_GO: 1737 type = NL80211_IFTYPE_AP; 1738 sdata->vif.type = type; 1739 sdata->vif.p2p = true; 1740 fallthrough; 1741 case NL80211_IFTYPE_AP: 1742 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1743 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1744 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1745 break; 1746 case NL80211_IFTYPE_P2P_CLIENT: 1747 type = NL80211_IFTYPE_STATION; 1748 sdata->vif.type = type; 1749 sdata->vif.p2p = true; 1750 fallthrough; 1751 case NL80211_IFTYPE_STATION: 1752 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1753 ieee80211_sta_setup_sdata(sdata); 1754 break; 1755 case NL80211_IFTYPE_OCB: 1756 sdata->vif.bss_conf.bssid = bssid_wildcard; 1757 ieee80211_ocb_setup_sdata(sdata); 1758 break; 1759 case NL80211_IFTYPE_ADHOC: 1760 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1761 ieee80211_ibss_setup_sdata(sdata); 1762 break; 1763 case NL80211_IFTYPE_MESH_POINT: 1764 if (ieee80211_vif_is_mesh(&sdata->vif)) 1765 ieee80211_mesh_init_sdata(sdata); 1766 break; 1767 case NL80211_IFTYPE_MONITOR: 1768 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1769 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1770 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1771 MONITOR_FLAG_OTHER_BSS; 1772 break; 1773 case NL80211_IFTYPE_NAN: 1774 idr_init(&sdata->u.nan.function_inst_ids); 1775 spin_lock_init(&sdata->u.nan.func_lock); 1776 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1777 break; 1778 case NL80211_IFTYPE_AP_VLAN: 1779 case NL80211_IFTYPE_P2P_DEVICE: 1780 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1781 break; 1782 case NL80211_IFTYPE_UNSPECIFIED: 1783 case NL80211_IFTYPE_WDS: 1784 case NUM_NL80211_IFTYPES: 1785 WARN_ON(1); 1786 break; 1787 } 1788 1789 /* need to do this after the switch so vif.type is correct */ 1790 ieee80211_link_setup(&sdata->deflink); 1791 1792 ieee80211_debugfs_recreate_netdev(sdata, false); 1793 } 1794 1795 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1796 enum nl80211_iftype type) 1797 { 1798 struct ieee80211_local *local = sdata->local; 1799 int ret, err; 1800 enum nl80211_iftype internal_type = type; 1801 bool p2p = false; 1802 1803 ASSERT_RTNL(); 1804 1805 if (!local->ops->change_interface) 1806 return -EBUSY; 1807 1808 /* for now, don't support changing while links exist */ 1809 if (ieee80211_vif_is_mld(&sdata->vif)) 1810 return -EBUSY; 1811 1812 switch (sdata->vif.type) { 1813 case NL80211_IFTYPE_AP: 1814 if (!list_empty(&sdata->u.ap.vlans)) 1815 return -EBUSY; 1816 break; 1817 case NL80211_IFTYPE_STATION: 1818 case NL80211_IFTYPE_ADHOC: 1819 case NL80211_IFTYPE_OCB: 1820 /* 1821 * Could maybe also all others here? 1822 * Just not sure how that interacts 1823 * with the RX/config path e.g. for 1824 * mesh. 1825 */ 1826 break; 1827 default: 1828 return -EBUSY; 1829 } 1830 1831 switch (type) { 1832 case NL80211_IFTYPE_AP: 1833 case NL80211_IFTYPE_STATION: 1834 case NL80211_IFTYPE_ADHOC: 1835 case NL80211_IFTYPE_OCB: 1836 /* 1837 * Could probably support everything 1838 * but here. 1839 */ 1840 break; 1841 case NL80211_IFTYPE_P2P_CLIENT: 1842 p2p = true; 1843 internal_type = NL80211_IFTYPE_STATION; 1844 break; 1845 case NL80211_IFTYPE_P2P_GO: 1846 p2p = true; 1847 internal_type = NL80211_IFTYPE_AP; 1848 break; 1849 default: 1850 return -EBUSY; 1851 } 1852 1853 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1854 if (ret) 1855 return ret; 1856 1857 ieee80211_stop_vif_queues(local, sdata, 1858 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1859 /* do_stop will synchronize_rcu() first thing */ 1860 ieee80211_do_stop(sdata, false); 1861 1862 ieee80211_teardown_sdata(sdata); 1863 1864 ieee80211_set_sdata_offload_flags(sdata); 1865 ret = drv_change_interface(local, sdata, internal_type, p2p); 1866 if (ret) 1867 type = ieee80211_vif_type_p2p(&sdata->vif); 1868 1869 /* 1870 * Ignore return value here, there's not much we can do since 1871 * the driver changed the interface type internally already. 1872 * The warnings will hopefully make driver authors fix it :-) 1873 */ 1874 ieee80211_check_queues(sdata, type); 1875 1876 ieee80211_setup_sdata(sdata, type); 1877 ieee80211_set_vif_encap_ops(sdata); 1878 1879 err = ieee80211_do_open(&sdata->wdev, false); 1880 WARN(err, "type change: do_open returned %d", err); 1881 1882 ieee80211_wake_vif_queues(local, sdata, 1883 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1884 return ret; 1885 } 1886 1887 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1888 enum nl80211_iftype type) 1889 { 1890 int ret; 1891 1892 ASSERT_RTNL(); 1893 1894 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1895 return 0; 1896 1897 if (ieee80211_sdata_running(sdata)) { 1898 ret = ieee80211_runtime_change_iftype(sdata, type); 1899 if (ret) 1900 return ret; 1901 } else { 1902 /* Purge and reset type-dependent state. */ 1903 ieee80211_teardown_sdata(sdata); 1904 ieee80211_setup_sdata(sdata, type); 1905 } 1906 1907 /* reset some values that shouldn't be kept across type changes */ 1908 if (type == NL80211_IFTYPE_STATION) 1909 sdata->u.mgd.use_4addr = false; 1910 1911 return 0; 1912 } 1913 1914 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1915 u8 *perm_addr, enum nl80211_iftype type) 1916 { 1917 struct ieee80211_sub_if_data *sdata; 1918 u64 mask, start, addr, val, inc; 1919 u8 *m; 1920 u8 tmp_addr[ETH_ALEN]; 1921 int i; 1922 1923 lockdep_assert_wiphy(local->hw.wiphy); 1924 1925 /* default ... something at least */ 1926 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1927 1928 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1929 local->hw.wiphy->n_addresses <= 1) 1930 return; 1931 1932 switch (type) { 1933 case NL80211_IFTYPE_MONITOR: 1934 /* doesn't matter */ 1935 break; 1936 case NL80211_IFTYPE_AP_VLAN: 1937 /* match up with an AP interface */ 1938 list_for_each_entry(sdata, &local->interfaces, list) { 1939 if (sdata->vif.type != NL80211_IFTYPE_AP) 1940 continue; 1941 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1942 break; 1943 } 1944 /* keep default if no AP interface present */ 1945 break; 1946 case NL80211_IFTYPE_P2P_CLIENT: 1947 case NL80211_IFTYPE_P2P_GO: 1948 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1949 list_for_each_entry(sdata, &local->interfaces, list) { 1950 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1951 continue; 1952 if (!ieee80211_sdata_running(sdata)) 1953 continue; 1954 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1955 return; 1956 } 1957 } 1958 fallthrough; 1959 default: 1960 /* assign a new address if possible -- try n_addresses first */ 1961 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1962 bool used = false; 1963 1964 list_for_each_entry(sdata, &local->interfaces, list) { 1965 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1966 sdata->vif.addr)) { 1967 used = true; 1968 break; 1969 } 1970 } 1971 1972 if (!used) { 1973 memcpy(perm_addr, 1974 local->hw.wiphy->addresses[i].addr, 1975 ETH_ALEN); 1976 break; 1977 } 1978 } 1979 1980 /* try mask if available */ 1981 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1982 break; 1983 1984 m = local->hw.wiphy->addr_mask; 1985 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1986 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1987 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1988 1989 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1990 /* not a contiguous mask ... not handled now! */ 1991 pr_info("not contiguous\n"); 1992 break; 1993 } 1994 1995 /* 1996 * Pick address of existing interface in case user changed 1997 * MAC address manually, default to perm_addr. 1998 */ 1999 m = local->hw.wiphy->perm_addr; 2000 list_for_each_entry(sdata, &local->interfaces, list) { 2001 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2002 continue; 2003 m = sdata->vif.addr; 2004 break; 2005 } 2006 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2007 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2008 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2009 2010 inc = 1ULL<<__ffs64(mask); 2011 val = (start & mask); 2012 addr = (start & ~mask) | (val & mask); 2013 do { 2014 bool used = false; 2015 2016 tmp_addr[5] = addr >> 0*8; 2017 tmp_addr[4] = addr >> 1*8; 2018 tmp_addr[3] = addr >> 2*8; 2019 tmp_addr[2] = addr >> 3*8; 2020 tmp_addr[1] = addr >> 4*8; 2021 tmp_addr[0] = addr >> 5*8; 2022 2023 val += inc; 2024 2025 list_for_each_entry(sdata, &local->interfaces, list) { 2026 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2027 used = true; 2028 break; 2029 } 2030 } 2031 2032 if (!used) { 2033 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2034 break; 2035 } 2036 addr = (start & ~mask) | (val & mask); 2037 } while (addr != start); 2038 2039 break; 2040 } 2041 } 2042 2043 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2044 unsigned char name_assign_type, 2045 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2046 struct vif_params *params) 2047 { 2048 struct net_device *ndev = NULL; 2049 struct ieee80211_sub_if_data *sdata = NULL; 2050 struct txq_info *txqi; 2051 int ret, i; 2052 2053 ASSERT_RTNL(); 2054 lockdep_assert_wiphy(local->hw.wiphy); 2055 2056 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2057 struct wireless_dev *wdev; 2058 2059 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2060 GFP_KERNEL); 2061 if (!sdata) 2062 return -ENOMEM; 2063 wdev = &sdata->wdev; 2064 2065 sdata->dev = NULL; 2066 strscpy(sdata->name, name, IFNAMSIZ); 2067 ieee80211_assign_perm_addr(local, wdev->address, type); 2068 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2069 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2070 } else { 2071 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2072 sizeof(void *)); 2073 int txq_size = 0; 2074 2075 if (type != NL80211_IFTYPE_AP_VLAN && 2076 (type != NL80211_IFTYPE_MONITOR || 2077 (params->flags & MONITOR_FLAG_ACTIVE))) 2078 txq_size += sizeof(struct txq_info) + 2079 local->hw.txq_data_size; 2080 2081 ndev = alloc_netdev_mqs(size + txq_size, 2082 name, name_assign_type, 2083 ieee80211_if_setup, 1, 1); 2084 if (!ndev) 2085 return -ENOMEM; 2086 2087 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2088 2089 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2090 2091 ndev->needed_headroom = local->tx_headroom + 2092 4*6 /* four MAC addresses */ 2093 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2094 + 6 /* mesh */ 2095 + 8 /* rfc1042/bridge tunnel */ 2096 - ETH_HLEN /* ethernet hard_header_len */ 2097 + IEEE80211_ENCRYPT_HEADROOM; 2098 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2099 2100 ret = dev_alloc_name(ndev, ndev->name); 2101 if (ret < 0) { 2102 free_netdev(ndev); 2103 return ret; 2104 } 2105 2106 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2107 if (is_valid_ether_addr(params->macaddr)) 2108 eth_hw_addr_set(ndev, params->macaddr); 2109 else 2110 eth_hw_addr_set(ndev, ndev->perm_addr); 2111 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2112 2113 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2114 sdata = netdev_priv(ndev); 2115 ndev->ieee80211_ptr = &sdata->wdev; 2116 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2117 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2118 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2119 2120 if (txq_size) { 2121 txqi = netdev_priv(ndev) + size; 2122 ieee80211_txq_init(sdata, NULL, txqi, 0); 2123 } 2124 2125 sdata->dev = ndev; 2126 } 2127 2128 /* initialise type-independent data */ 2129 sdata->wdev.wiphy = local->hw.wiphy; 2130 2131 ieee80211_sdata_init(local, sdata); 2132 2133 ieee80211_init_frag_cache(&sdata->frags); 2134 2135 INIT_LIST_HEAD(&sdata->key_list); 2136 2137 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2138 ieee80211_delayed_tailroom_dec); 2139 2140 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2141 struct ieee80211_supported_band *sband; 2142 sband = local->hw.wiphy->bands[i]; 2143 sdata->rc_rateidx_mask[i] = 2144 sband ? (1 << sband->n_bitrates) - 1 : 0; 2145 if (sband) { 2146 __le16 cap; 2147 u16 *vht_rate_mask; 2148 2149 memcpy(sdata->rc_rateidx_mcs_mask[i], 2150 sband->ht_cap.mcs.rx_mask, 2151 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2152 2153 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2154 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2155 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2156 } else { 2157 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2158 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2159 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2160 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2161 } 2162 } 2163 2164 ieee80211_set_default_queues(sdata); 2165 2166 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2167 sdata->deflink.user_power_level = local->user_power_level; 2168 2169 /* setup type-dependent data */ 2170 ieee80211_setup_sdata(sdata, type); 2171 2172 if (ndev) { 2173 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2174 if (type == NL80211_IFTYPE_STATION) 2175 sdata->u.mgd.use_4addr = params->use_4addr; 2176 2177 ndev->features |= local->hw.netdev_features; 2178 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2179 ndev->hw_features |= ndev->features & 2180 MAC80211_SUPPORTED_FEATURES_TX; 2181 sdata->vif.netdev_features = local->hw.netdev_features; 2182 2183 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2184 2185 /* MTU range is normally 256 - 2304, where the upper limit is 2186 * the maximum MSDU size. Monitor interfaces send and receive 2187 * MPDU and A-MSDU frames which may be much larger so we do 2188 * not impose an upper limit in that case. 2189 */ 2190 ndev->min_mtu = 256; 2191 if (type == NL80211_IFTYPE_MONITOR) 2192 ndev->max_mtu = 0; 2193 else 2194 ndev->max_mtu = local->hw.max_mtu; 2195 2196 ret = cfg80211_register_netdevice(ndev); 2197 if (ret) { 2198 free_netdev(ndev); 2199 return ret; 2200 } 2201 } 2202 2203 mutex_lock(&local->iflist_mtx); 2204 list_add_tail_rcu(&sdata->list, &local->interfaces); 2205 mutex_unlock(&local->iflist_mtx); 2206 2207 if (new_wdev) 2208 *new_wdev = &sdata->wdev; 2209 2210 return 0; 2211 } 2212 2213 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2214 { 2215 ASSERT_RTNL(); 2216 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2217 2218 mutex_lock(&sdata->local->iflist_mtx); 2219 list_del_rcu(&sdata->list); 2220 mutex_unlock(&sdata->local->iflist_mtx); 2221 2222 if (sdata->vif.txq) 2223 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2224 2225 synchronize_rcu(); 2226 2227 cfg80211_unregister_wdev(&sdata->wdev); 2228 2229 if (!sdata->dev) { 2230 ieee80211_teardown_sdata(sdata); 2231 kfree(sdata); 2232 } 2233 } 2234 2235 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2236 { 2237 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2238 return; 2239 ieee80211_do_stop(sdata, true); 2240 } 2241 2242 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2243 { 2244 struct ieee80211_sub_if_data *sdata, *tmp; 2245 LIST_HEAD(unreg_list); 2246 2247 ASSERT_RTNL(); 2248 2249 /* Before destroying the interfaces, make sure they're all stopped so 2250 * that the hardware is stopped. Otherwise, the driver might still be 2251 * iterating the interfaces during the shutdown, e.g. from a worker 2252 * or from RX processing or similar, and if it does so (using atomic 2253 * iteration) while we're manipulating the list, the iteration will 2254 * crash. 2255 * 2256 * After this, the hardware should be stopped and the driver should 2257 * have stopped all of its activities, so that we can do RCU-unaware 2258 * manipulations of the interface list below. 2259 */ 2260 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2261 2262 wiphy_lock(local->hw.wiphy); 2263 2264 WARN(local->open_count, "%s: open count remains %d\n", 2265 wiphy_name(local->hw.wiphy), local->open_count); 2266 2267 mutex_lock(&local->iflist_mtx); 2268 list_splice_init(&local->interfaces, &unreg_list); 2269 mutex_unlock(&local->iflist_mtx); 2270 2271 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2272 bool netdev = sdata->dev; 2273 2274 /* 2275 * Remove IP addresses explicitly, since the notifier will 2276 * skip the callbacks if wdev->registered is false, since 2277 * we can't acquire the wiphy_lock() again there if already 2278 * inside this locked section. 2279 */ 2280 sdata->vif.cfg.arp_addr_cnt = 0; 2281 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2282 sdata->u.mgd.associated) 2283 ieee80211_vif_cfg_change_notify(sdata, 2284 BSS_CHANGED_ARP_FILTER); 2285 2286 list_del(&sdata->list); 2287 cfg80211_unregister_wdev(&sdata->wdev); 2288 2289 if (!netdev) 2290 kfree(sdata); 2291 } 2292 wiphy_unlock(local->hw.wiphy); 2293 } 2294 2295 static int netdev_notify(struct notifier_block *nb, 2296 unsigned long state, void *ptr) 2297 { 2298 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2299 struct ieee80211_sub_if_data *sdata; 2300 2301 if (state != NETDEV_CHANGENAME) 2302 return NOTIFY_DONE; 2303 2304 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2305 return NOTIFY_DONE; 2306 2307 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2308 return NOTIFY_DONE; 2309 2310 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2311 memcpy(sdata->name, dev->name, IFNAMSIZ); 2312 ieee80211_debugfs_rename_netdev(sdata); 2313 2314 return NOTIFY_OK; 2315 } 2316 2317 static struct notifier_block mac80211_netdev_notifier = { 2318 .notifier_call = netdev_notify, 2319 }; 2320 2321 int ieee80211_iface_init(void) 2322 { 2323 return register_netdevice_notifier(&mac80211_netdev_notifier); 2324 } 2325 2326 void ieee80211_iface_exit(void) 2327 { 2328 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2329 } 2330 2331 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2332 { 2333 if (sdata->vif.type == NL80211_IFTYPE_AP) 2334 atomic_inc(&sdata->u.ap.num_mcast_sta); 2335 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2336 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2337 } 2338 2339 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2340 { 2341 if (sdata->vif.type == NL80211_IFTYPE_AP) 2342 atomic_dec(&sdata->u.ap.num_mcast_sta); 2343 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2344 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2345 } 2346 2347 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2348 { 2349 struct ieee80211_local *local = sdata->local; 2350 2351 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2352 return; 2353 2354 ieee80211_stop_vif_queues(local, sdata, 2355 IEEE80211_QUEUE_STOP_REASON_CSA); 2356 sdata->csa_blocked_queues = true; 2357 } 2358 2359 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2360 { 2361 struct ieee80211_local *local = sdata->local; 2362 2363 if (sdata->csa_blocked_queues) { 2364 ieee80211_wake_vif_queues(local, sdata, 2365 IEEE80211_QUEUE_STOP_REASON_CSA); 2366 sdata->csa_blocked_queues = false; 2367 } 2368 } 2369