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 if (sdata->csa_blocked_queues) { 548 ieee80211_wake_vif_queues(local, sdata, 549 IEEE80211_QUEUE_STOP_REASON_CSA); 550 sdata->csa_blocked_queues = false; 551 } 552 553 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa_finalize_work); 554 wiphy_work_cancel(local->hw.wiphy, 555 &sdata->deflink.color_change_finalize_work); 556 wiphy_delayed_work_cancel(local->hw.wiphy, 557 &sdata->deflink.dfs_cac_timer_work); 558 559 if (sdata->wdev.cac_started) { 560 chandef = sdata->vif.bss_conf.chanreq.oper; 561 WARN_ON(local->suspended); 562 ieee80211_link_release_channel(&sdata->deflink); 563 cfg80211_cac_event(sdata->dev, &chandef, 564 NL80211_RADAR_CAC_ABORTED, 565 GFP_KERNEL); 566 } 567 568 if (sdata->vif.type == NL80211_IFTYPE_AP) { 569 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 570 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 571 /* remove all packets in parent bc_buf pointing to this dev */ 572 ps = &sdata->bss->ps; 573 574 spin_lock_irqsave(&ps->bc_buf.lock, flags); 575 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 576 if (skb->dev == sdata->dev) { 577 __skb_unlink(skb, &ps->bc_buf); 578 local->total_ps_buffered--; 579 ieee80211_free_txskb(&local->hw, skb); 580 } 581 } 582 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 583 } 584 585 if (going_down) 586 local->open_count--; 587 588 switch (sdata->vif.type) { 589 case NL80211_IFTYPE_AP_VLAN: 590 list_del(&sdata->u.vlan.list); 591 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 592 /* see comment in the default case below */ 593 ieee80211_free_keys(sdata, true); 594 /* no need to tell driver */ 595 break; 596 case NL80211_IFTYPE_MONITOR: 597 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 598 local->cooked_mntrs--; 599 break; 600 } 601 602 local->monitors--; 603 if (local->monitors == 0) { 604 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 605 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 606 } 607 608 ieee80211_adjust_monitor_flags(sdata, -1); 609 break; 610 case NL80211_IFTYPE_NAN: 611 /* clean all the functions */ 612 spin_lock_bh(&sdata->u.nan.func_lock); 613 614 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 615 idr_remove(&sdata->u.nan.function_inst_ids, i); 616 cfg80211_free_nan_func(func); 617 } 618 idr_destroy(&sdata->u.nan.function_inst_ids); 619 620 spin_unlock_bh(&sdata->u.nan.func_lock); 621 break; 622 case NL80211_IFTYPE_P2P_DEVICE: 623 /* relies on synchronize_rcu() below */ 624 RCU_INIT_POINTER(local->p2p_sdata, NULL); 625 fallthrough; 626 default: 627 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 628 /* 629 * When we get here, the interface is marked down. 630 * Free the remaining keys, if there are any 631 * (which can happen in AP mode if userspace sets 632 * keys before the interface is operating) 633 * 634 * Force the key freeing to always synchronize_net() 635 * to wait for the RX path in case it is using this 636 * interface enqueuing frames at this very time on 637 * another CPU. 638 */ 639 ieee80211_free_keys(sdata, true); 640 skb_queue_purge(&sdata->skb_queue); 641 skb_queue_purge(&sdata->status_queue); 642 } 643 644 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 645 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 646 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 647 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 648 if (info->control.vif == &sdata->vif) { 649 __skb_unlink(skb, &local->pending[i]); 650 ieee80211_free_txskb(&local->hw, skb); 651 } 652 } 653 } 654 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 655 656 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 657 ieee80211_txq_remove_vlan(local, sdata); 658 659 sdata->bss = NULL; 660 661 if (local->open_count == 0) 662 ieee80211_clear_tx_pending(local); 663 664 sdata->vif.bss_conf.beacon_int = 0; 665 666 /* 667 * If the interface goes down while suspended, presumably because 668 * the device was unplugged and that happens before our resume, 669 * then the driver is already unconfigured and the remainder of 670 * this function isn't needed. 671 * XXX: what about WoWLAN? If the device has software state, e.g. 672 * memory allocated, it might expect teardown commands from 673 * mac80211 here? 674 */ 675 if (local->suspended) { 676 WARN_ON(local->wowlan); 677 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 678 return; 679 } 680 681 switch (sdata->vif.type) { 682 case NL80211_IFTYPE_AP_VLAN: 683 break; 684 case NL80211_IFTYPE_MONITOR: 685 if (local->monitors == 0) 686 ieee80211_del_virtual_monitor(local); 687 688 ieee80211_recalc_idle(local); 689 ieee80211_recalc_offload(local); 690 691 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 692 break; 693 694 fallthrough; 695 default: 696 if (going_down) 697 drv_remove_interface(local, sdata); 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); 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 void 820 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 821 { 822 dev_fetch_sw_netstats(stats, dev->tstats); 823 } 824 825 static int ieee80211_netdev_setup_tc(struct net_device *dev, 826 enum tc_setup_type type, void *type_data) 827 { 828 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 829 struct ieee80211_local *local = sdata->local; 830 831 return drv_net_setup_tc(local, sdata, dev, type, type_data); 832 } 833 834 static const struct net_device_ops ieee80211_dataif_ops = { 835 .ndo_open = ieee80211_open, 836 .ndo_stop = ieee80211_stop, 837 .ndo_uninit = ieee80211_uninit, 838 .ndo_start_xmit = ieee80211_subif_start_xmit, 839 .ndo_set_rx_mode = ieee80211_set_multicast_list, 840 .ndo_set_mac_address = ieee80211_change_mac, 841 .ndo_get_stats64 = ieee80211_get_stats64, 842 .ndo_setup_tc = ieee80211_netdev_setup_tc, 843 }; 844 845 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 846 struct sk_buff *skb, 847 struct net_device *sb_dev) 848 { 849 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 850 struct ieee80211_local *local = sdata->local; 851 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 852 struct ieee80211_hdr *hdr; 853 int len_rthdr; 854 855 if (local->hw.queues < IEEE80211_NUM_ACS) 856 return 0; 857 858 /* reset flags and info before parsing radiotap header */ 859 memset(info, 0, sizeof(*info)); 860 861 if (!ieee80211_parse_tx_radiotap(skb, dev)) 862 return 0; /* doesn't matter, frame will be dropped */ 863 864 len_rthdr = ieee80211_get_radiotap_len(skb->data); 865 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 866 if (skb->len < len_rthdr + 2 || 867 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 868 return 0; /* doesn't matter, frame will be dropped */ 869 870 return ieee80211_select_queue_80211(sdata, skb, hdr); 871 } 872 873 static const struct net_device_ops ieee80211_monitorif_ops = { 874 .ndo_open = ieee80211_open, 875 .ndo_stop = ieee80211_stop, 876 .ndo_uninit = ieee80211_uninit, 877 .ndo_start_xmit = ieee80211_monitor_start_xmit, 878 .ndo_set_rx_mode = ieee80211_set_multicast_list, 879 .ndo_set_mac_address = ieee80211_change_mac, 880 .ndo_select_queue = ieee80211_monitor_select_queue, 881 .ndo_get_stats64 = ieee80211_get_stats64, 882 }; 883 884 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 885 struct net_device_path *path) 886 { 887 struct ieee80211_sub_if_data *sdata; 888 struct ieee80211_local *local; 889 struct sta_info *sta; 890 int ret = -ENOENT; 891 892 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 893 local = sdata->local; 894 895 if (!local->ops->net_fill_forward_path) 896 return -EOPNOTSUPP; 897 898 rcu_read_lock(); 899 switch (sdata->vif.type) { 900 case NL80211_IFTYPE_AP_VLAN: 901 sta = rcu_dereference(sdata->u.vlan.sta); 902 if (sta) 903 break; 904 if (sdata->wdev.use_4addr) 905 goto out; 906 if (is_multicast_ether_addr(ctx->daddr)) 907 goto out; 908 sta = sta_info_get_bss(sdata, ctx->daddr); 909 break; 910 case NL80211_IFTYPE_AP: 911 if (is_multicast_ether_addr(ctx->daddr)) 912 goto out; 913 sta = sta_info_get(sdata, ctx->daddr); 914 break; 915 case NL80211_IFTYPE_STATION: 916 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 917 sta = sta_info_get(sdata, ctx->daddr); 918 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 919 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 920 goto out; 921 922 break; 923 } 924 } 925 926 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 927 break; 928 default: 929 goto out; 930 } 931 932 if (!sta) 933 goto out; 934 935 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 936 out: 937 rcu_read_unlock(); 938 939 return ret; 940 } 941 942 static const struct net_device_ops ieee80211_dataif_8023_ops = { 943 .ndo_open = ieee80211_open, 944 .ndo_stop = ieee80211_stop, 945 .ndo_uninit = ieee80211_uninit, 946 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 947 .ndo_set_rx_mode = ieee80211_set_multicast_list, 948 .ndo_set_mac_address = ieee80211_change_mac, 949 .ndo_get_stats64 = ieee80211_get_stats64, 950 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 951 .ndo_setup_tc = ieee80211_netdev_setup_tc, 952 }; 953 954 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 955 { 956 switch (iftype) { 957 /* P2P GO and client are mapped to AP/STATION types */ 958 case NL80211_IFTYPE_AP: 959 case NL80211_IFTYPE_STATION: 960 return true; 961 default: 962 return false; 963 } 964 } 965 966 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 967 { 968 struct ieee80211_local *local = sdata->local; 969 u32 flags; 970 971 flags = sdata->vif.offload_flags; 972 973 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 974 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 975 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 976 977 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 978 local->hw.wiphy->frag_threshold != (u32)-1) 979 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 980 981 if (local->monitors) 982 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 983 } else { 984 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 985 } 986 987 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 988 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 989 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 990 991 if (local->monitors && 992 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 993 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 994 } else { 995 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 996 } 997 998 if (sdata->vif.offload_flags == flags) 999 return false; 1000 1001 sdata->vif.offload_flags = flags; 1002 ieee80211_check_fast_rx_iface(sdata); 1003 return true; 1004 } 1005 1006 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1007 { 1008 struct ieee80211_local *local = sdata->local; 1009 struct ieee80211_sub_if_data *bss = sdata; 1010 bool enabled; 1011 1012 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1013 if (!sdata->bss) 1014 return; 1015 1016 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1017 } 1018 1019 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1020 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1021 return; 1022 1023 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1024 if (sdata->wdev.use_4addr && 1025 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1026 enabled = false; 1027 1028 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1029 &ieee80211_dataif_ops; 1030 } 1031 1032 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1033 { 1034 struct ieee80211_local *local = sdata->local; 1035 struct ieee80211_sub_if_data *vsdata; 1036 1037 if (ieee80211_set_sdata_offload_flags(sdata)) { 1038 drv_update_vif_offload(local, sdata); 1039 ieee80211_set_vif_encap_ops(sdata); 1040 } 1041 1042 list_for_each_entry(vsdata, &local->interfaces, list) { 1043 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1044 vsdata->bss != &sdata->u.ap) 1045 continue; 1046 1047 ieee80211_set_vif_encap_ops(vsdata); 1048 } 1049 } 1050 1051 void ieee80211_recalc_offload(struct ieee80211_local *local) 1052 { 1053 struct ieee80211_sub_if_data *sdata; 1054 1055 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1056 return; 1057 1058 lockdep_assert_wiphy(local->hw.wiphy); 1059 1060 list_for_each_entry(sdata, &local->interfaces, list) { 1061 if (!ieee80211_sdata_running(sdata)) 1062 continue; 1063 1064 ieee80211_recalc_sdata_offload(sdata); 1065 } 1066 } 1067 1068 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1069 const int offset) 1070 { 1071 struct ieee80211_local *local = sdata->local; 1072 u32 flags = sdata->u.mntr.flags; 1073 1074 #define ADJUST(_f, _s) do { \ 1075 if (flags & MONITOR_FLAG_##_f) \ 1076 local->fif_##_s += offset; \ 1077 } while (0) 1078 1079 ADJUST(FCSFAIL, fcsfail); 1080 ADJUST(PLCPFAIL, plcpfail); 1081 ADJUST(CONTROL, control); 1082 ADJUST(CONTROL, pspoll); 1083 ADJUST(OTHER_BSS, other_bss); 1084 1085 #undef ADJUST 1086 } 1087 1088 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1089 { 1090 struct ieee80211_local *local = sdata->local; 1091 int i; 1092 1093 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1094 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1095 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1096 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1097 sdata->vif.hw_queue[i] = i; 1098 else 1099 sdata->vif.hw_queue[i] = 0; 1100 } 1101 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1102 } 1103 1104 static void ieee80211_sdata_init(struct ieee80211_local *local, 1105 struct ieee80211_sub_if_data *sdata) 1106 { 1107 sdata->local = local; 1108 1109 /* 1110 * Initialize the default link, so we can use link_id 0 for non-MLD, 1111 * and that continues to work for non-MLD-aware drivers that use just 1112 * vif.bss_conf instead of vif.link_conf. 1113 * 1114 * Note that we never change this, so if link ID 0 isn't used in an 1115 * MLD connection, we get a separate allocation for it. 1116 */ 1117 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1118 } 1119 1120 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1121 { 1122 struct ieee80211_sub_if_data *sdata; 1123 int ret; 1124 1125 ASSERT_RTNL(); 1126 lockdep_assert_wiphy(local->hw.wiphy); 1127 1128 if (local->monitor_sdata) 1129 return 0; 1130 1131 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1132 if (!sdata) 1133 return -ENOMEM; 1134 1135 /* set up data */ 1136 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1137 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1138 wiphy_name(local->hw.wiphy)); 1139 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1140 sdata->wdev.wiphy = local->hw.wiphy; 1141 1142 ieee80211_sdata_init(local, sdata); 1143 1144 ieee80211_set_default_queues(sdata); 1145 1146 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1147 ret = drv_add_interface(local, sdata); 1148 if (WARN_ON(ret)) { 1149 /* ok .. stupid driver, it asked for this! */ 1150 kfree(sdata); 1151 return ret; 1152 } 1153 } 1154 1155 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1156 1157 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1158 if (ret) { 1159 kfree(sdata); 1160 return ret; 1161 } 1162 1163 mutex_lock(&local->iflist_mtx); 1164 rcu_assign_pointer(local->monitor_sdata, sdata); 1165 mutex_unlock(&local->iflist_mtx); 1166 1167 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1168 IEEE80211_CHANCTX_EXCLUSIVE); 1169 if (ret) { 1170 mutex_lock(&local->iflist_mtx); 1171 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1172 mutex_unlock(&local->iflist_mtx); 1173 synchronize_net(); 1174 drv_remove_interface(local, sdata); 1175 kfree(sdata); 1176 return ret; 1177 } 1178 1179 skb_queue_head_init(&sdata->skb_queue); 1180 skb_queue_head_init(&sdata->status_queue); 1181 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1182 1183 return 0; 1184 } 1185 1186 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1187 { 1188 struct ieee80211_sub_if_data *sdata; 1189 1190 ASSERT_RTNL(); 1191 lockdep_assert_wiphy(local->hw.wiphy); 1192 1193 mutex_lock(&local->iflist_mtx); 1194 1195 sdata = rcu_dereference_protected(local->monitor_sdata, 1196 lockdep_is_held(&local->iflist_mtx)); 1197 if (!sdata) { 1198 mutex_unlock(&local->iflist_mtx); 1199 return; 1200 } 1201 1202 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1203 mutex_unlock(&local->iflist_mtx); 1204 1205 synchronize_net(); 1206 1207 ieee80211_link_release_channel(&sdata->deflink); 1208 1209 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1210 drv_remove_interface(local, sdata); 1211 1212 kfree(sdata); 1213 } 1214 1215 /* 1216 * NOTE: Be very careful when changing this function, it must NOT return 1217 * an error on interface type changes that have been pre-checked, so most 1218 * checks should be in ieee80211_check_concurrent_iface. 1219 */ 1220 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1221 { 1222 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1223 struct net_device *dev = wdev->netdev; 1224 struct ieee80211_local *local = sdata->local; 1225 u64 changed = 0; 1226 int res; 1227 u32 hw_reconf_flags = 0; 1228 1229 lockdep_assert_wiphy(local->hw.wiphy); 1230 1231 switch (sdata->vif.type) { 1232 case NL80211_IFTYPE_AP_VLAN: { 1233 struct ieee80211_sub_if_data *master; 1234 1235 if (!sdata->bss) 1236 return -ENOLINK; 1237 1238 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1239 1240 master = container_of(sdata->bss, 1241 struct ieee80211_sub_if_data, u.ap); 1242 sdata->control_port_protocol = 1243 master->control_port_protocol; 1244 sdata->control_port_no_encrypt = 1245 master->control_port_no_encrypt; 1246 sdata->control_port_over_nl80211 = 1247 master->control_port_over_nl80211; 1248 sdata->control_port_no_preauth = 1249 master->control_port_no_preauth; 1250 sdata->vif.cab_queue = master->vif.cab_queue; 1251 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1252 sizeof(sdata->vif.hw_queue)); 1253 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1254 1255 sdata->crypto_tx_tailroom_needed_cnt += 1256 master->crypto_tx_tailroom_needed_cnt; 1257 1258 break; 1259 } 1260 case NL80211_IFTYPE_AP: 1261 sdata->bss = &sdata->u.ap; 1262 break; 1263 case NL80211_IFTYPE_MESH_POINT: 1264 case NL80211_IFTYPE_STATION: 1265 case NL80211_IFTYPE_MONITOR: 1266 case NL80211_IFTYPE_ADHOC: 1267 case NL80211_IFTYPE_P2P_DEVICE: 1268 case NL80211_IFTYPE_OCB: 1269 case NL80211_IFTYPE_NAN: 1270 /* no special treatment */ 1271 break; 1272 case NL80211_IFTYPE_UNSPECIFIED: 1273 case NUM_NL80211_IFTYPES: 1274 case NL80211_IFTYPE_P2P_CLIENT: 1275 case NL80211_IFTYPE_P2P_GO: 1276 case NL80211_IFTYPE_WDS: 1277 /* cannot happen */ 1278 WARN_ON(1); 1279 break; 1280 } 1281 1282 if (local->open_count == 0) { 1283 /* here we can consider everything in good order (again) */ 1284 local->reconfig_failure = false; 1285 1286 res = drv_start(local); 1287 if (res) 1288 goto err_del_bss; 1289 ieee80211_led_radio(local, true); 1290 ieee80211_mod_tpt_led_trig(local, 1291 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1292 } 1293 1294 /* 1295 * Copy the hopefully now-present MAC address to 1296 * this interface, if it has the special null one. 1297 */ 1298 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1299 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1300 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1301 1302 if (!is_valid_ether_addr(dev->dev_addr)) { 1303 res = -EADDRNOTAVAIL; 1304 goto err_stop; 1305 } 1306 } 1307 1308 switch (sdata->vif.type) { 1309 case NL80211_IFTYPE_AP_VLAN: 1310 /* no need to tell driver, but set carrier and chanctx */ 1311 if (sdata->bss->active) { 1312 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1313 netif_carrier_on(dev); 1314 ieee80211_set_vif_encap_ops(sdata); 1315 } else { 1316 netif_carrier_off(dev); 1317 } 1318 break; 1319 case NL80211_IFTYPE_MONITOR: 1320 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1321 local->cooked_mntrs++; 1322 break; 1323 } 1324 1325 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1326 res = drv_add_interface(local, sdata); 1327 if (res) 1328 goto err_stop; 1329 } else if (local->monitors == 0 && local->open_count == 0) { 1330 res = ieee80211_add_virtual_monitor(local); 1331 if (res) 1332 goto err_stop; 1333 } 1334 1335 /* must be before the call to ieee80211_configure_filter */ 1336 local->monitors++; 1337 if (local->monitors == 1) { 1338 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1339 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1340 } 1341 1342 ieee80211_adjust_monitor_flags(sdata, 1); 1343 ieee80211_configure_filter(local); 1344 ieee80211_recalc_offload(local); 1345 ieee80211_recalc_idle(local); 1346 1347 netif_carrier_on(dev); 1348 break; 1349 default: 1350 if (coming_up) { 1351 ieee80211_del_virtual_monitor(local); 1352 ieee80211_set_sdata_offload_flags(sdata); 1353 1354 res = drv_add_interface(local, sdata); 1355 if (res) 1356 goto err_stop; 1357 1358 ieee80211_set_vif_encap_ops(sdata); 1359 res = ieee80211_check_queues(sdata, 1360 ieee80211_vif_type_p2p(&sdata->vif)); 1361 if (res) 1362 goto err_del_interface; 1363 } 1364 1365 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1366 local->fif_pspoll++; 1367 local->fif_probe_req++; 1368 1369 ieee80211_configure_filter(local); 1370 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1371 local->fif_probe_req++; 1372 } 1373 1374 if (sdata->vif.probe_req_reg) 1375 drv_config_iface_filter(local, sdata, 1376 FIF_PROBE_REQ, 1377 FIF_PROBE_REQ); 1378 1379 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1380 sdata->vif.type != NL80211_IFTYPE_NAN) 1381 changed |= ieee80211_reset_erp_info(sdata); 1382 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1383 changed); 1384 1385 switch (sdata->vif.type) { 1386 case NL80211_IFTYPE_STATION: 1387 case NL80211_IFTYPE_ADHOC: 1388 case NL80211_IFTYPE_AP: 1389 case NL80211_IFTYPE_MESH_POINT: 1390 case NL80211_IFTYPE_OCB: 1391 netif_carrier_off(dev); 1392 break; 1393 case NL80211_IFTYPE_P2P_DEVICE: 1394 case NL80211_IFTYPE_NAN: 1395 break; 1396 default: 1397 /* not reached */ 1398 WARN_ON(1); 1399 } 1400 1401 /* 1402 * Set default queue parameters so drivers don't 1403 * need to initialise the hardware if the hardware 1404 * doesn't start up with sane defaults. 1405 * Enable QoS for anything but station interfaces. 1406 */ 1407 ieee80211_set_wmm_default(&sdata->deflink, true, 1408 sdata->vif.type != NL80211_IFTYPE_STATION); 1409 } 1410 1411 switch (sdata->vif.type) { 1412 case NL80211_IFTYPE_P2P_DEVICE: 1413 rcu_assign_pointer(local->p2p_sdata, sdata); 1414 break; 1415 case NL80211_IFTYPE_MONITOR: 1416 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1417 break; 1418 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1419 break; 1420 default: 1421 break; 1422 } 1423 1424 /* 1425 * set_multicast_list will be invoked by the networking core 1426 * which will check whether any increments here were done in 1427 * error and sync them down to the hardware as filter flags. 1428 */ 1429 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1430 atomic_inc(&local->iff_allmultis); 1431 1432 if (coming_up) 1433 local->open_count++; 1434 1435 if (local->open_count == 1) 1436 ieee80211_hw_conf_init(local); 1437 else if (hw_reconf_flags) 1438 ieee80211_hw_config(local, hw_reconf_flags); 1439 1440 ieee80211_recalc_ps(local); 1441 1442 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1443 1444 return 0; 1445 err_del_interface: 1446 drv_remove_interface(local, sdata); 1447 err_stop: 1448 if (!local->open_count) 1449 drv_stop(local); 1450 err_del_bss: 1451 sdata->bss = NULL; 1452 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1453 list_del(&sdata->u.vlan.list); 1454 /* might already be clear but that doesn't matter */ 1455 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1456 return res; 1457 } 1458 1459 static void ieee80211_if_free(struct net_device *dev) 1460 { 1461 free_percpu(dev->tstats); 1462 } 1463 1464 static void ieee80211_if_setup(struct net_device *dev) 1465 { 1466 ether_setup(dev); 1467 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1468 dev->priv_flags |= IFF_NO_QUEUE; 1469 dev->netdev_ops = &ieee80211_dataif_ops; 1470 dev->needs_free_netdev = true; 1471 dev->priv_destructor = ieee80211_if_free; 1472 } 1473 1474 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1475 struct ieee80211_sub_if_data *sdata, 1476 struct sk_buff *skb) 1477 { 1478 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1479 1480 lockdep_assert_wiphy(local->hw.wiphy); 1481 1482 if (ieee80211_is_action(mgmt->frame_control) && 1483 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1484 struct sta_info *sta; 1485 int len = skb->len; 1486 1487 sta = sta_info_get_bss(sdata, mgmt->sa); 1488 if (sta) { 1489 switch (mgmt->u.action.u.addba_req.action_code) { 1490 case WLAN_ACTION_ADDBA_REQ: 1491 ieee80211_process_addba_request(local, sta, 1492 mgmt, len); 1493 break; 1494 case WLAN_ACTION_ADDBA_RESP: 1495 ieee80211_process_addba_resp(local, sta, 1496 mgmt, len); 1497 break; 1498 case WLAN_ACTION_DELBA: 1499 ieee80211_process_delba(sdata, sta, 1500 mgmt, len); 1501 break; 1502 default: 1503 WARN_ON(1); 1504 break; 1505 } 1506 } 1507 } else if (ieee80211_is_action(mgmt->frame_control) && 1508 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1509 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1510 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1511 struct ieee80211_rx_status *status; 1512 enum nl80211_band band; 1513 struct sta_info *sta; 1514 u8 opmode; 1515 1516 status = IEEE80211_SKB_RXCB(skb); 1517 band = status->band; 1518 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1519 1520 sta = sta_info_get_bss(sdata, mgmt->sa); 1521 1522 if (sta) 1523 ieee80211_vht_handle_opmode(sdata, 1524 &sta->deflink, 1525 opmode, band); 1526 1527 break; 1528 } 1529 case WLAN_VHT_ACTION_GROUPID_MGMT: 1530 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1531 mgmt); 1532 break; 1533 default: 1534 WARN_ON(1); 1535 break; 1536 } 1537 } else if (ieee80211_is_action(mgmt->frame_control) && 1538 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1539 switch (mgmt->u.action.u.s1g.action_code) { 1540 case WLAN_S1G_TWT_TEARDOWN: 1541 case WLAN_S1G_TWT_SETUP: 1542 ieee80211_s1g_rx_twt_action(sdata, skb); 1543 break; 1544 default: 1545 break; 1546 } 1547 } else if (ieee80211_is_action(mgmt->frame_control) && 1548 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1549 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1550 switch (mgmt->u.action.u.ttlm_req.action_code) { 1551 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1552 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1553 skb->len); 1554 break; 1555 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1556 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1557 skb->len); 1558 break; 1559 default: 1560 break; 1561 } 1562 } 1563 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1564 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1565 ieee80211_sta_rx_queued_ext(sdata, skb); 1566 else 1567 WARN_ON(1); 1568 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1569 struct ieee80211_hdr *hdr = (void *)mgmt; 1570 struct sta_info *sta; 1571 1572 /* 1573 * So the frame isn't mgmt, but frame_control 1574 * is at the right place anyway, of course, so 1575 * the if statement is correct. 1576 * 1577 * Warn if we have other data frame types here, 1578 * they must not get here. 1579 */ 1580 WARN_ON(hdr->frame_control & 1581 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1582 WARN_ON(!(hdr->seq_ctrl & 1583 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1584 /* 1585 * This was a fragment of a frame, received while 1586 * a block-ack session was active. That cannot be 1587 * right, so terminate the session. 1588 */ 1589 sta = sta_info_get_bss(sdata, mgmt->sa); 1590 if (sta) { 1591 u16 tid = ieee80211_get_tid(hdr); 1592 1593 __ieee80211_stop_rx_ba_session( 1594 sta, tid, WLAN_BACK_RECIPIENT, 1595 WLAN_REASON_QSTA_REQUIRE_SETUP, 1596 true); 1597 } 1598 } else switch (sdata->vif.type) { 1599 case NL80211_IFTYPE_STATION: 1600 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1601 break; 1602 case NL80211_IFTYPE_ADHOC: 1603 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1604 break; 1605 case NL80211_IFTYPE_MESH_POINT: 1606 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1607 break; 1608 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1609 break; 1610 default: 1611 WARN(1, "frame for unexpected interface type"); 1612 break; 1613 } 1614 } 1615 1616 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1617 struct sk_buff *skb) 1618 { 1619 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1620 1621 if (ieee80211_is_action(mgmt->frame_control) && 1622 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1623 switch (mgmt->u.action.u.s1g.action_code) { 1624 case WLAN_S1G_TWT_TEARDOWN: 1625 case WLAN_S1G_TWT_SETUP: 1626 ieee80211_s1g_status_twt_action(sdata, skb); 1627 break; 1628 default: 1629 break; 1630 } 1631 } 1632 } 1633 1634 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1635 { 1636 struct ieee80211_sub_if_data *sdata = 1637 container_of(work, struct ieee80211_sub_if_data, work); 1638 struct ieee80211_local *local = sdata->local; 1639 struct sk_buff *skb; 1640 1641 if (!ieee80211_sdata_running(sdata)) 1642 return; 1643 1644 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1645 return; 1646 1647 if (!ieee80211_can_run_worker(local)) 1648 return; 1649 1650 /* first process frames */ 1651 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1652 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1653 1654 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1655 ieee80211_process_tdls_channel_switch(sdata, skb); 1656 else 1657 ieee80211_iface_process_skb(local, sdata, skb); 1658 1659 kfree_skb(skb); 1660 kcov_remote_stop(); 1661 } 1662 1663 /* process status queue */ 1664 while ((skb = skb_dequeue(&sdata->status_queue))) { 1665 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1666 1667 ieee80211_iface_process_status(sdata, skb); 1668 kfree_skb(skb); 1669 1670 kcov_remote_stop(); 1671 } 1672 1673 /* then other type-dependent work */ 1674 switch (sdata->vif.type) { 1675 case NL80211_IFTYPE_STATION: 1676 ieee80211_sta_work(sdata); 1677 break; 1678 case NL80211_IFTYPE_ADHOC: 1679 ieee80211_ibss_work(sdata); 1680 break; 1681 case NL80211_IFTYPE_MESH_POINT: 1682 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1683 break; 1684 ieee80211_mesh_work(sdata); 1685 break; 1686 case NL80211_IFTYPE_OCB: 1687 ieee80211_ocb_work(sdata); 1688 break; 1689 default: 1690 break; 1691 } 1692 } 1693 1694 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1695 struct wiphy_work *work) 1696 { 1697 struct ieee80211_sub_if_data *sdata = 1698 container_of(work, struct ieee80211_sub_if_data, 1699 activate_links_work); 1700 struct ieee80211_local *local = wiphy_priv(wiphy); 1701 1702 if (local->in_reconfig) 1703 return; 1704 1705 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1706 sdata->desired_active_links = 0; 1707 } 1708 1709 /* 1710 * Helper function to initialise an interface to a specific type. 1711 */ 1712 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1713 enum nl80211_iftype type) 1714 { 1715 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1716 0xff, 0xff, 0xff}; 1717 1718 /* clear type-dependent unions */ 1719 memset(&sdata->u, 0, sizeof(sdata->u)); 1720 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1721 1722 /* and set some type-dependent values */ 1723 sdata->vif.type = type; 1724 sdata->vif.p2p = false; 1725 sdata->wdev.iftype = type; 1726 1727 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1728 sdata->control_port_no_encrypt = false; 1729 sdata->control_port_over_nl80211 = false; 1730 sdata->control_port_no_preauth = false; 1731 sdata->vif.cfg.idle = true; 1732 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1733 1734 sdata->noack_map = 0; 1735 1736 /* only monitor/p2p-device differ */ 1737 if (sdata->dev) { 1738 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1739 sdata->dev->type = ARPHRD_ETHER; 1740 } 1741 1742 skb_queue_head_init(&sdata->skb_queue); 1743 skb_queue_head_init(&sdata->status_queue); 1744 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1745 wiphy_work_init(&sdata->activate_links_work, 1746 ieee80211_activate_links_work); 1747 1748 switch (type) { 1749 case NL80211_IFTYPE_P2P_GO: 1750 type = NL80211_IFTYPE_AP; 1751 sdata->vif.type = type; 1752 sdata->vif.p2p = true; 1753 fallthrough; 1754 case NL80211_IFTYPE_AP: 1755 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1756 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1757 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1758 break; 1759 case NL80211_IFTYPE_P2P_CLIENT: 1760 type = NL80211_IFTYPE_STATION; 1761 sdata->vif.type = type; 1762 sdata->vif.p2p = true; 1763 fallthrough; 1764 case NL80211_IFTYPE_STATION: 1765 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1766 ieee80211_sta_setup_sdata(sdata); 1767 break; 1768 case NL80211_IFTYPE_OCB: 1769 sdata->vif.bss_conf.bssid = bssid_wildcard; 1770 ieee80211_ocb_setup_sdata(sdata); 1771 break; 1772 case NL80211_IFTYPE_ADHOC: 1773 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1774 ieee80211_ibss_setup_sdata(sdata); 1775 break; 1776 case NL80211_IFTYPE_MESH_POINT: 1777 if (ieee80211_vif_is_mesh(&sdata->vif)) 1778 ieee80211_mesh_init_sdata(sdata); 1779 break; 1780 case NL80211_IFTYPE_MONITOR: 1781 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1782 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1783 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1784 MONITOR_FLAG_OTHER_BSS; 1785 break; 1786 case NL80211_IFTYPE_NAN: 1787 idr_init(&sdata->u.nan.function_inst_ids); 1788 spin_lock_init(&sdata->u.nan.func_lock); 1789 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1790 break; 1791 case NL80211_IFTYPE_AP_VLAN: 1792 case NL80211_IFTYPE_P2P_DEVICE: 1793 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1794 break; 1795 case NL80211_IFTYPE_UNSPECIFIED: 1796 case NL80211_IFTYPE_WDS: 1797 case NUM_NL80211_IFTYPES: 1798 WARN_ON(1); 1799 break; 1800 } 1801 1802 /* need to do this after the switch so vif.type is correct */ 1803 ieee80211_link_setup(&sdata->deflink); 1804 1805 ieee80211_debugfs_recreate_netdev(sdata, false); 1806 } 1807 1808 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1809 enum nl80211_iftype type) 1810 { 1811 struct ieee80211_local *local = sdata->local; 1812 int ret, err; 1813 enum nl80211_iftype internal_type = type; 1814 bool p2p = false; 1815 1816 ASSERT_RTNL(); 1817 1818 if (!local->ops->change_interface) 1819 return -EBUSY; 1820 1821 /* for now, don't support changing while links exist */ 1822 if (ieee80211_vif_is_mld(&sdata->vif)) 1823 return -EBUSY; 1824 1825 switch (sdata->vif.type) { 1826 case NL80211_IFTYPE_AP: 1827 if (!list_empty(&sdata->u.ap.vlans)) 1828 return -EBUSY; 1829 break; 1830 case NL80211_IFTYPE_STATION: 1831 case NL80211_IFTYPE_ADHOC: 1832 case NL80211_IFTYPE_OCB: 1833 /* 1834 * Could maybe also all others here? 1835 * Just not sure how that interacts 1836 * with the RX/config path e.g. for 1837 * mesh. 1838 */ 1839 break; 1840 default: 1841 return -EBUSY; 1842 } 1843 1844 switch (type) { 1845 case NL80211_IFTYPE_AP: 1846 case NL80211_IFTYPE_STATION: 1847 case NL80211_IFTYPE_ADHOC: 1848 case NL80211_IFTYPE_OCB: 1849 /* 1850 * Could probably support everything 1851 * but here. 1852 */ 1853 break; 1854 case NL80211_IFTYPE_P2P_CLIENT: 1855 p2p = true; 1856 internal_type = NL80211_IFTYPE_STATION; 1857 break; 1858 case NL80211_IFTYPE_P2P_GO: 1859 p2p = true; 1860 internal_type = NL80211_IFTYPE_AP; 1861 break; 1862 default: 1863 return -EBUSY; 1864 } 1865 1866 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1867 if (ret) 1868 return ret; 1869 1870 ieee80211_stop_vif_queues(local, sdata, 1871 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1872 /* do_stop will synchronize_rcu() first thing */ 1873 ieee80211_do_stop(sdata, false); 1874 1875 ieee80211_teardown_sdata(sdata); 1876 1877 ieee80211_set_sdata_offload_flags(sdata); 1878 ret = drv_change_interface(local, sdata, internal_type, p2p); 1879 if (ret) 1880 type = ieee80211_vif_type_p2p(&sdata->vif); 1881 1882 /* 1883 * Ignore return value here, there's not much we can do since 1884 * the driver changed the interface type internally already. 1885 * The warnings will hopefully make driver authors fix it :-) 1886 */ 1887 ieee80211_check_queues(sdata, type); 1888 1889 ieee80211_setup_sdata(sdata, type); 1890 ieee80211_set_vif_encap_ops(sdata); 1891 1892 err = ieee80211_do_open(&sdata->wdev, false); 1893 WARN(err, "type change: do_open returned %d", err); 1894 1895 ieee80211_wake_vif_queues(local, sdata, 1896 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1897 return ret; 1898 } 1899 1900 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1901 enum nl80211_iftype type) 1902 { 1903 int ret; 1904 1905 ASSERT_RTNL(); 1906 1907 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1908 return 0; 1909 1910 if (ieee80211_sdata_running(sdata)) { 1911 ret = ieee80211_runtime_change_iftype(sdata, type); 1912 if (ret) 1913 return ret; 1914 } else { 1915 /* Purge and reset type-dependent state. */ 1916 ieee80211_teardown_sdata(sdata); 1917 ieee80211_setup_sdata(sdata, type); 1918 } 1919 1920 /* reset some values that shouldn't be kept across type changes */ 1921 if (type == NL80211_IFTYPE_STATION) 1922 sdata->u.mgd.use_4addr = false; 1923 1924 return 0; 1925 } 1926 1927 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1928 u8 *perm_addr, enum nl80211_iftype type) 1929 { 1930 struct ieee80211_sub_if_data *sdata; 1931 u64 mask, start, addr, val, inc; 1932 u8 *m; 1933 u8 tmp_addr[ETH_ALEN]; 1934 int i; 1935 1936 lockdep_assert_wiphy(local->hw.wiphy); 1937 1938 /* default ... something at least */ 1939 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1940 1941 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1942 local->hw.wiphy->n_addresses <= 1) 1943 return; 1944 1945 switch (type) { 1946 case NL80211_IFTYPE_MONITOR: 1947 /* doesn't matter */ 1948 break; 1949 case NL80211_IFTYPE_AP_VLAN: 1950 /* match up with an AP interface */ 1951 list_for_each_entry(sdata, &local->interfaces, list) { 1952 if (sdata->vif.type != NL80211_IFTYPE_AP) 1953 continue; 1954 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1955 break; 1956 } 1957 /* keep default if no AP interface present */ 1958 break; 1959 case NL80211_IFTYPE_P2P_CLIENT: 1960 case NL80211_IFTYPE_P2P_GO: 1961 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1962 list_for_each_entry(sdata, &local->interfaces, list) { 1963 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1964 continue; 1965 if (!ieee80211_sdata_running(sdata)) 1966 continue; 1967 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1968 return; 1969 } 1970 } 1971 fallthrough; 1972 default: 1973 /* assign a new address if possible -- try n_addresses first */ 1974 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1975 bool used = false; 1976 1977 list_for_each_entry(sdata, &local->interfaces, list) { 1978 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1979 sdata->vif.addr)) { 1980 used = true; 1981 break; 1982 } 1983 } 1984 1985 if (!used) { 1986 memcpy(perm_addr, 1987 local->hw.wiphy->addresses[i].addr, 1988 ETH_ALEN); 1989 break; 1990 } 1991 } 1992 1993 /* try mask if available */ 1994 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1995 break; 1996 1997 m = local->hw.wiphy->addr_mask; 1998 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1999 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2000 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2001 2002 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2003 /* not a contiguous mask ... not handled now! */ 2004 pr_info("not contiguous\n"); 2005 break; 2006 } 2007 2008 /* 2009 * Pick address of existing interface in case user changed 2010 * MAC address manually, default to perm_addr. 2011 */ 2012 m = local->hw.wiphy->perm_addr; 2013 list_for_each_entry(sdata, &local->interfaces, list) { 2014 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2015 continue; 2016 m = sdata->vif.addr; 2017 break; 2018 } 2019 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2020 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2021 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2022 2023 inc = 1ULL<<__ffs64(mask); 2024 val = (start & mask); 2025 addr = (start & ~mask) | (val & mask); 2026 do { 2027 bool used = false; 2028 2029 tmp_addr[5] = addr >> 0*8; 2030 tmp_addr[4] = addr >> 1*8; 2031 tmp_addr[3] = addr >> 2*8; 2032 tmp_addr[2] = addr >> 3*8; 2033 tmp_addr[1] = addr >> 4*8; 2034 tmp_addr[0] = addr >> 5*8; 2035 2036 val += inc; 2037 2038 list_for_each_entry(sdata, &local->interfaces, list) { 2039 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2040 used = true; 2041 break; 2042 } 2043 } 2044 2045 if (!used) { 2046 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2047 break; 2048 } 2049 addr = (start & ~mask) | (val & mask); 2050 } while (addr != start); 2051 2052 break; 2053 } 2054 } 2055 2056 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2057 unsigned char name_assign_type, 2058 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2059 struct vif_params *params) 2060 { 2061 struct net_device *ndev = NULL; 2062 struct ieee80211_sub_if_data *sdata = NULL; 2063 struct txq_info *txqi; 2064 int ret, i; 2065 2066 ASSERT_RTNL(); 2067 lockdep_assert_wiphy(local->hw.wiphy); 2068 2069 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2070 struct wireless_dev *wdev; 2071 2072 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2073 GFP_KERNEL); 2074 if (!sdata) 2075 return -ENOMEM; 2076 wdev = &sdata->wdev; 2077 2078 sdata->dev = NULL; 2079 strscpy(sdata->name, name, IFNAMSIZ); 2080 ieee80211_assign_perm_addr(local, wdev->address, type); 2081 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2082 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2083 } else { 2084 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2085 sizeof(void *)); 2086 int txq_size = 0; 2087 2088 if (type != NL80211_IFTYPE_AP_VLAN && 2089 (type != NL80211_IFTYPE_MONITOR || 2090 (params->flags & MONITOR_FLAG_ACTIVE))) 2091 txq_size += sizeof(struct txq_info) + 2092 local->hw.txq_data_size; 2093 2094 ndev = alloc_netdev_mqs(size + txq_size, 2095 name, name_assign_type, 2096 ieee80211_if_setup, 1, 1); 2097 if (!ndev) 2098 return -ENOMEM; 2099 2100 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2101 2102 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2103 if (!ndev->tstats) { 2104 free_netdev(ndev); 2105 return -ENOMEM; 2106 } 2107 2108 ndev->needed_headroom = local->tx_headroom + 2109 4*6 /* four MAC addresses */ 2110 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2111 + 6 /* mesh */ 2112 + 8 /* rfc1042/bridge tunnel */ 2113 - ETH_HLEN /* ethernet hard_header_len */ 2114 + IEEE80211_ENCRYPT_HEADROOM; 2115 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2116 2117 ret = dev_alloc_name(ndev, ndev->name); 2118 if (ret < 0) { 2119 ieee80211_if_free(ndev); 2120 free_netdev(ndev); 2121 return ret; 2122 } 2123 2124 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2125 if (is_valid_ether_addr(params->macaddr)) 2126 eth_hw_addr_set(ndev, params->macaddr); 2127 else 2128 eth_hw_addr_set(ndev, ndev->perm_addr); 2129 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2130 2131 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2132 sdata = netdev_priv(ndev); 2133 ndev->ieee80211_ptr = &sdata->wdev; 2134 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2135 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2136 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2137 2138 if (txq_size) { 2139 txqi = netdev_priv(ndev) + size; 2140 ieee80211_txq_init(sdata, NULL, txqi, 0); 2141 } 2142 2143 sdata->dev = ndev; 2144 } 2145 2146 /* initialise type-independent data */ 2147 sdata->wdev.wiphy = local->hw.wiphy; 2148 2149 ieee80211_sdata_init(local, sdata); 2150 2151 ieee80211_init_frag_cache(&sdata->frags); 2152 2153 INIT_LIST_HEAD(&sdata->key_list); 2154 2155 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2156 ieee80211_delayed_tailroom_dec); 2157 2158 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2159 struct ieee80211_supported_band *sband; 2160 sband = local->hw.wiphy->bands[i]; 2161 sdata->rc_rateidx_mask[i] = 2162 sband ? (1 << sband->n_bitrates) - 1 : 0; 2163 if (sband) { 2164 __le16 cap; 2165 u16 *vht_rate_mask; 2166 2167 memcpy(sdata->rc_rateidx_mcs_mask[i], 2168 sband->ht_cap.mcs.rx_mask, 2169 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2170 2171 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2172 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2173 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2174 } else { 2175 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2176 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2177 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2178 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2179 } 2180 } 2181 2182 ieee80211_set_default_queues(sdata); 2183 2184 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2185 sdata->deflink.user_power_level = local->user_power_level; 2186 2187 /* setup type-dependent data */ 2188 ieee80211_setup_sdata(sdata, type); 2189 2190 if (ndev) { 2191 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2192 if (type == NL80211_IFTYPE_STATION) 2193 sdata->u.mgd.use_4addr = params->use_4addr; 2194 2195 ndev->features |= local->hw.netdev_features; 2196 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2197 ndev->hw_features |= ndev->features & 2198 MAC80211_SUPPORTED_FEATURES_TX; 2199 sdata->vif.netdev_features = local->hw.netdev_features; 2200 2201 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2202 2203 /* MTU range is normally 256 - 2304, where the upper limit is 2204 * the maximum MSDU size. Monitor interfaces send and receive 2205 * MPDU and A-MSDU frames which may be much larger so we do 2206 * not impose an upper limit in that case. 2207 */ 2208 ndev->min_mtu = 256; 2209 if (type == NL80211_IFTYPE_MONITOR) 2210 ndev->max_mtu = 0; 2211 else 2212 ndev->max_mtu = local->hw.max_mtu; 2213 2214 ret = cfg80211_register_netdevice(ndev); 2215 if (ret) { 2216 free_netdev(ndev); 2217 return ret; 2218 } 2219 } 2220 2221 mutex_lock(&local->iflist_mtx); 2222 list_add_tail_rcu(&sdata->list, &local->interfaces); 2223 mutex_unlock(&local->iflist_mtx); 2224 2225 if (new_wdev) 2226 *new_wdev = &sdata->wdev; 2227 2228 return 0; 2229 } 2230 2231 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2232 { 2233 ASSERT_RTNL(); 2234 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2235 2236 mutex_lock(&sdata->local->iflist_mtx); 2237 list_del_rcu(&sdata->list); 2238 mutex_unlock(&sdata->local->iflist_mtx); 2239 2240 if (sdata->vif.txq) 2241 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2242 2243 synchronize_rcu(); 2244 2245 cfg80211_unregister_wdev(&sdata->wdev); 2246 2247 if (!sdata->dev) { 2248 ieee80211_teardown_sdata(sdata); 2249 kfree(sdata); 2250 } 2251 } 2252 2253 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2254 { 2255 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2256 return; 2257 ieee80211_do_stop(sdata, true); 2258 } 2259 2260 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2261 { 2262 struct ieee80211_sub_if_data *sdata, *tmp; 2263 LIST_HEAD(unreg_list); 2264 2265 ASSERT_RTNL(); 2266 2267 /* Before destroying the interfaces, make sure they're all stopped so 2268 * that the hardware is stopped. Otherwise, the driver might still be 2269 * iterating the interfaces during the shutdown, e.g. from a worker 2270 * or from RX processing or similar, and if it does so (using atomic 2271 * iteration) while we're manipulating the list, the iteration will 2272 * crash. 2273 * 2274 * After this, the hardware should be stopped and the driver should 2275 * have stopped all of its activities, so that we can do RCU-unaware 2276 * manipulations of the interface list below. 2277 */ 2278 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2279 2280 wiphy_lock(local->hw.wiphy); 2281 2282 WARN(local->open_count, "%s: open count remains %d\n", 2283 wiphy_name(local->hw.wiphy), local->open_count); 2284 2285 mutex_lock(&local->iflist_mtx); 2286 list_splice_init(&local->interfaces, &unreg_list); 2287 mutex_unlock(&local->iflist_mtx); 2288 2289 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2290 bool netdev = sdata->dev; 2291 2292 /* 2293 * Remove IP addresses explicitly, since the notifier will 2294 * skip the callbacks if wdev->registered is false, since 2295 * we can't acquire the wiphy_lock() again there if already 2296 * inside this locked section. 2297 */ 2298 sdata->vif.cfg.arp_addr_cnt = 0; 2299 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2300 sdata->u.mgd.associated) 2301 ieee80211_vif_cfg_change_notify(sdata, 2302 BSS_CHANGED_ARP_FILTER); 2303 2304 list_del(&sdata->list); 2305 cfg80211_unregister_wdev(&sdata->wdev); 2306 2307 if (!netdev) 2308 kfree(sdata); 2309 } 2310 wiphy_unlock(local->hw.wiphy); 2311 } 2312 2313 static int netdev_notify(struct notifier_block *nb, 2314 unsigned long state, void *ptr) 2315 { 2316 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2317 struct ieee80211_sub_if_data *sdata; 2318 2319 if (state != NETDEV_CHANGENAME) 2320 return NOTIFY_DONE; 2321 2322 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2323 return NOTIFY_DONE; 2324 2325 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2326 return NOTIFY_DONE; 2327 2328 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2329 memcpy(sdata->name, dev->name, IFNAMSIZ); 2330 ieee80211_debugfs_rename_netdev(sdata); 2331 2332 return NOTIFY_OK; 2333 } 2334 2335 static struct notifier_block mac80211_netdev_notifier = { 2336 .notifier_call = netdev_notify, 2337 }; 2338 2339 int ieee80211_iface_init(void) 2340 { 2341 return register_netdevice_notifier(&mac80211_netdev_notifier); 2342 } 2343 2344 void ieee80211_iface_exit(void) 2345 { 2346 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2347 } 2348 2349 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2350 { 2351 if (sdata->vif.type == NL80211_IFTYPE_AP) 2352 atomic_inc(&sdata->u.ap.num_mcast_sta); 2353 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2354 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2355 } 2356 2357 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2358 { 2359 if (sdata->vif.type == NL80211_IFTYPE_AP) 2360 atomic_dec(&sdata->u.ap.num_mcast_sta); 2361 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2362 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2363 } 2364