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) 2018-2023 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 37 * (2) modifications and readers are protected against each other by 38 * the iflist_mtx. 39 * (3) modifications are done in an RCU manner so atomic readers 40 * can traverse the list in RCU-safe blocks. 41 * 42 * As a consequence, reads (traversals) of the list can be protected 43 * by either the RTNL, the iflist_mtx or RCU. 44 */ 45 46 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work); 47 48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 49 { 50 struct ieee80211_chanctx_conf *chanctx_conf; 51 int power; 52 53 rcu_read_lock(); 54 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 55 if (!chanctx_conf) { 56 rcu_read_unlock(); 57 return false; 58 } 59 60 power = ieee80211_chandef_max_power(&chanctx_conf->def); 61 rcu_read_unlock(); 62 63 if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL) 64 power = min(power, sdata->deflink.user_power_level); 65 66 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 67 power = min(power, sdata->deflink.ap_power_level); 68 69 if (power != sdata->vif.bss_conf.txpower) { 70 sdata->vif.bss_conf.txpower = power; 71 ieee80211_hw_config(sdata->local, 0); 72 return true; 73 } 74 75 return false; 76 } 77 78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 79 bool update_bss) 80 { 81 if (__ieee80211_recalc_txpower(sdata) || 82 (update_bss && ieee80211_sdata_running(sdata))) 83 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 84 BSS_CHANGED_TXPOWER); 85 } 86 87 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 88 { 89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 90 return 0; 91 92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 93 return IEEE80211_CONF_CHANGE_IDLE; 94 } 95 96 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 97 { 98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 99 return 0; 100 101 ieee80211_flush_queues(local, NULL, false); 102 103 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 104 return IEEE80211_CONF_CHANGE_IDLE; 105 } 106 107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 108 bool force_active) 109 { 110 bool working, scanning, active; 111 unsigned int led_trig_start = 0, led_trig_stop = 0; 112 113 lockdep_assert_held(&local->mtx); 114 115 active = force_active || 116 !list_empty(&local->chanctx_list) || 117 local->monitors; 118 119 working = !local->ops->remain_on_channel && 120 !list_empty(&local->roc_list); 121 122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 124 125 if (working || scanning) 126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 127 else 128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 129 130 if (active) 131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 132 else 133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 134 135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 136 137 if (working || scanning || active) 138 return __ieee80211_idle_off(local); 139 return __ieee80211_idle_on(local); 140 } 141 142 u32 ieee80211_idle_off(struct ieee80211_local *local) 143 { 144 return __ieee80211_recalc_idle(local, true); 145 } 146 147 void ieee80211_recalc_idle(struct ieee80211_local *local) 148 { 149 u32 change = __ieee80211_recalc_idle(local, false); 150 if (change) 151 ieee80211_hw_config(local, change); 152 } 153 154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 155 bool check_dup) 156 { 157 struct ieee80211_local *local = sdata->local; 158 struct ieee80211_sub_if_data *iter; 159 u64 new, mask, tmp; 160 u8 *m; 161 int ret = 0; 162 163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 164 return 0; 165 166 m = addr; 167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 170 171 m = local->hw.wiphy->addr_mask; 172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 175 176 if (!check_dup) 177 return ret; 178 179 mutex_lock(&local->iflist_mtx); 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 mutex_unlock(&local->iflist_mtx); 199 200 return ret; 201 } 202 203 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 204 { 205 struct ieee80211_roc_work *roc; 206 struct ieee80211_local *local = sdata->local; 207 struct ieee80211_sub_if_data *scan_sdata; 208 int ret = 0; 209 210 /* To be the most flexible here we want to only limit changing the 211 * address if the specific interface is doing offchannel work or 212 * scanning. 213 */ 214 if (netif_carrier_ok(sdata->dev)) 215 return -EBUSY; 216 217 mutex_lock(&local->mtx); 218 219 /* First check no ROC work is happening on this iface */ 220 list_for_each_entry(roc, &local->roc_list, list) { 221 if (roc->sdata != sdata) 222 continue; 223 224 if (roc->started) { 225 ret = -EBUSY; 226 goto unlock; 227 } 228 } 229 230 /* And if this iface is scanning */ 231 if (local->scanning) { 232 scan_sdata = rcu_dereference_protected(local->scan_sdata, 233 lockdep_is_held(&local->mtx)); 234 if (sdata == scan_sdata) 235 ret = -EBUSY; 236 } 237 238 switch (sdata->vif.type) { 239 case NL80211_IFTYPE_STATION: 240 case NL80211_IFTYPE_P2P_CLIENT: 241 /* More interface types could be added here but changing the 242 * address while powered makes the most sense in client modes. 243 */ 244 break; 245 default: 246 ret = -EOPNOTSUPP; 247 } 248 249 unlock: 250 mutex_unlock(&local->mtx); 251 return ret; 252 } 253 254 static int ieee80211_change_mac(struct net_device *dev, void *addr) 255 { 256 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 257 struct ieee80211_local *local = sdata->local; 258 struct sockaddr *sa = addr; 259 bool check_dup = true; 260 bool live = false; 261 int ret; 262 263 if (ieee80211_sdata_running(sdata)) { 264 ret = ieee80211_can_powered_addr_change(sdata); 265 if (ret) 266 return ret; 267 268 live = true; 269 } 270 271 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 272 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 273 check_dup = false; 274 275 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 276 if (ret) 277 return ret; 278 279 if (live) 280 drv_remove_interface(local, sdata); 281 ret = eth_mac_addr(dev, sa); 282 283 if (ret == 0) { 284 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 285 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 286 } 287 288 /* Regardless of eth_mac_addr() return we still want to add the 289 * interface back. This should not fail... 290 */ 291 if (live) 292 WARN_ON(drv_add_interface(local, sdata)); 293 294 return ret; 295 } 296 297 static inline int identical_mac_addr_allowed(int type1, int type2) 298 { 299 return type1 == NL80211_IFTYPE_MONITOR || 300 type2 == NL80211_IFTYPE_MONITOR || 301 type1 == NL80211_IFTYPE_P2P_DEVICE || 302 type2 == NL80211_IFTYPE_P2P_DEVICE || 303 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 304 (type1 == NL80211_IFTYPE_AP_VLAN && 305 (type2 == NL80211_IFTYPE_AP || 306 type2 == NL80211_IFTYPE_AP_VLAN)); 307 } 308 309 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 310 enum nl80211_iftype iftype) 311 { 312 struct ieee80211_local *local = sdata->local; 313 struct ieee80211_sub_if_data *nsdata; 314 int ret; 315 316 ASSERT_RTNL(); 317 318 /* we hold the RTNL here so can safely walk the list */ 319 list_for_each_entry(nsdata, &local->interfaces, list) { 320 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 321 /* 322 * Only OCB and monitor mode may coexist 323 */ 324 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 325 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 326 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 327 nsdata->vif.type == NL80211_IFTYPE_OCB)) 328 return -EBUSY; 329 330 /* 331 * Allow only a single IBSS interface to be up at any 332 * time. This is restricted because beacon distribution 333 * cannot work properly if both are in the same IBSS. 334 * 335 * To remove this restriction we'd have to disallow them 336 * from setting the same SSID on different IBSS interfaces 337 * belonging to the same hardware. Then, however, we're 338 * faced with having to adopt two different TSF timers... 339 */ 340 if (iftype == NL80211_IFTYPE_ADHOC && 341 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 342 return -EBUSY; 343 /* 344 * will not add another interface while any channel 345 * switch is active. 346 */ 347 if (nsdata->vif.bss_conf.csa_active) 348 return -EBUSY; 349 350 /* 351 * The remaining checks are only performed for interfaces 352 * with the same MAC address. 353 */ 354 if (!ether_addr_equal(sdata->vif.addr, 355 nsdata->vif.addr)) 356 continue; 357 358 /* 359 * check whether it may have the same address 360 */ 361 if (!identical_mac_addr_allowed(iftype, 362 nsdata->vif.type)) 363 return -ENOTUNIQ; 364 365 /* No support for VLAN with MLO yet */ 366 if (iftype == NL80211_IFTYPE_AP_VLAN && 367 sdata->wdev.use_4addr && 368 nsdata->vif.type == NL80211_IFTYPE_AP && 369 nsdata->vif.valid_links) 370 return -EOPNOTSUPP; 371 372 /* 373 * can only add VLANs to enabled APs 374 */ 375 if (iftype == NL80211_IFTYPE_AP_VLAN && 376 nsdata->vif.type == NL80211_IFTYPE_AP) 377 sdata->bss = &nsdata->u.ap; 378 } 379 } 380 381 mutex_lock(&local->chanctx_mtx); 382 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 383 mutex_unlock(&local->chanctx_mtx); 384 return ret; 385 } 386 387 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 388 enum nl80211_iftype iftype) 389 { 390 int n_queues = sdata->local->hw.queues; 391 int i; 392 393 if (iftype == NL80211_IFTYPE_NAN) 394 return 0; 395 396 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 397 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 398 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 399 IEEE80211_INVAL_HW_QUEUE)) 400 return -EINVAL; 401 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 402 n_queues)) 403 return -EINVAL; 404 } 405 } 406 407 if ((iftype != NL80211_IFTYPE_AP && 408 iftype != NL80211_IFTYPE_P2P_GO && 409 iftype != NL80211_IFTYPE_MESH_POINT) || 410 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 411 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 412 return 0; 413 } 414 415 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 416 return -EINVAL; 417 418 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 419 return -EINVAL; 420 421 return 0; 422 } 423 424 static int ieee80211_open(struct net_device *dev) 425 { 426 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 427 int err; 428 429 /* fail early if user set an invalid address */ 430 if (!is_valid_ether_addr(dev->dev_addr)) 431 return -EADDRNOTAVAIL; 432 433 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 434 if (err) 435 return err; 436 437 wiphy_lock(sdata->local->hw.wiphy); 438 err = ieee80211_do_open(&sdata->wdev, true); 439 wiphy_unlock(sdata->local->hw.wiphy); 440 441 return err; 442 } 443 444 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 445 { 446 struct ieee80211_local *local = sdata->local; 447 unsigned long flags; 448 struct sk_buff *skb, *tmp; 449 u32 hw_reconf_flags = 0; 450 int i, flushed; 451 struct ps_data *ps; 452 struct cfg80211_chan_def chandef; 453 bool cancel_scan; 454 struct cfg80211_nan_func *func; 455 456 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 457 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 458 459 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 460 if (cancel_scan) 461 ieee80211_scan_cancel(local); 462 463 ieee80211_roc_purge(local, sdata); 464 465 switch (sdata->vif.type) { 466 case NL80211_IFTYPE_STATION: 467 ieee80211_mgd_stop(sdata); 468 break; 469 case NL80211_IFTYPE_ADHOC: 470 ieee80211_ibss_stop(sdata); 471 break; 472 case NL80211_IFTYPE_MONITOR: 473 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 474 break; 475 list_del_rcu(&sdata->u.mntr.list); 476 break; 477 default: 478 break; 479 } 480 481 /* 482 * Remove all stations associated with this interface. 483 * 484 * This must be done before calling ops->remove_interface() 485 * because otherwise we can later invoke ops->sta_notify() 486 * whenever the STAs are removed, and that invalidates driver 487 * assumptions about always getting a vif pointer that is valid 488 * (because if we remove a STA after ops->remove_interface() 489 * the driver will have removed the vif info already!) 490 * 491 * For AP_VLANs stations may exist since there's nothing else that 492 * would have removed them, but in other modes there shouldn't 493 * be any stations. 494 */ 495 flushed = sta_info_flush(sdata); 496 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 497 498 /* don't count this interface for allmulti while it is down */ 499 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 500 atomic_dec(&local->iff_allmultis); 501 502 if (sdata->vif.type == NL80211_IFTYPE_AP) { 503 local->fif_pspoll--; 504 local->fif_probe_req--; 505 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 506 local->fif_probe_req--; 507 } 508 509 if (sdata->dev) { 510 netif_addr_lock_bh(sdata->dev); 511 spin_lock_bh(&local->filter_lock); 512 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 513 sdata->dev->addr_len); 514 spin_unlock_bh(&local->filter_lock); 515 netif_addr_unlock_bh(sdata->dev); 516 } 517 518 del_timer_sync(&local->dynamic_ps_timer); 519 cancel_work_sync(&local->dynamic_ps_enable_work); 520 521 cancel_work_sync(&sdata->recalc_smps); 522 523 sdata_lock(sdata); 524 WARN(ieee80211_vif_is_mld(&sdata->vif), 525 "destroying interface with valid links 0x%04x\n", 526 sdata->vif.valid_links); 527 528 mutex_lock(&local->mtx); 529 sdata->vif.bss_conf.csa_active = false; 530 if (sdata->vif.type == NL80211_IFTYPE_STATION) 531 sdata->deflink.u.mgd.csa_waiting_bcn = false; 532 if (sdata->deflink.csa_block_tx) { 533 ieee80211_wake_vif_queues(local, sdata, 534 IEEE80211_QUEUE_STOP_REASON_CSA); 535 sdata->deflink.csa_block_tx = false; 536 } 537 mutex_unlock(&local->mtx); 538 sdata_unlock(sdata); 539 540 cancel_work_sync(&sdata->deflink.csa_finalize_work); 541 cancel_work_sync(&sdata->deflink.color_change_finalize_work); 542 543 cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work); 544 545 if (sdata->wdev.cac_started) { 546 chandef = sdata->vif.bss_conf.chandef; 547 WARN_ON(local->suspended); 548 mutex_lock(&local->mtx); 549 ieee80211_link_release_channel(&sdata->deflink); 550 mutex_unlock(&local->mtx); 551 cfg80211_cac_event(sdata->dev, &chandef, 552 NL80211_RADAR_CAC_ABORTED, 553 GFP_KERNEL); 554 } 555 556 if (sdata->vif.type == NL80211_IFTYPE_AP) { 557 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 558 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 559 /* remove all packets in parent bc_buf pointing to this dev */ 560 ps = &sdata->bss->ps; 561 562 spin_lock_irqsave(&ps->bc_buf.lock, flags); 563 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 564 if (skb->dev == sdata->dev) { 565 __skb_unlink(skb, &ps->bc_buf); 566 local->total_ps_buffered--; 567 ieee80211_free_txskb(&local->hw, skb); 568 } 569 } 570 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 571 } 572 573 if (going_down) 574 local->open_count--; 575 576 switch (sdata->vif.type) { 577 case NL80211_IFTYPE_AP_VLAN: 578 mutex_lock(&local->mtx); 579 list_del(&sdata->u.vlan.list); 580 mutex_unlock(&local->mtx); 581 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 582 /* see comment in the default case below */ 583 ieee80211_free_keys(sdata, true); 584 /* no need to tell driver */ 585 break; 586 case NL80211_IFTYPE_MONITOR: 587 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 588 local->cooked_mntrs--; 589 break; 590 } 591 592 local->monitors--; 593 if (local->monitors == 0) { 594 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 595 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 596 } 597 598 ieee80211_adjust_monitor_flags(sdata, -1); 599 break; 600 case NL80211_IFTYPE_NAN: 601 /* clean all the functions */ 602 spin_lock_bh(&sdata->u.nan.func_lock); 603 604 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 605 idr_remove(&sdata->u.nan.function_inst_ids, i); 606 cfg80211_free_nan_func(func); 607 } 608 idr_destroy(&sdata->u.nan.function_inst_ids); 609 610 spin_unlock_bh(&sdata->u.nan.func_lock); 611 break; 612 case NL80211_IFTYPE_P2P_DEVICE: 613 /* relies on synchronize_rcu() below */ 614 RCU_INIT_POINTER(local->p2p_sdata, NULL); 615 fallthrough; 616 default: 617 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 618 /* 619 * When we get here, the interface is marked down. 620 * Free the remaining keys, if there are any 621 * (which can happen in AP mode if userspace sets 622 * keys before the interface is operating) 623 * 624 * Force the key freeing to always synchronize_net() 625 * to wait for the RX path in case it is using this 626 * interface enqueuing frames at this very time on 627 * another CPU. 628 */ 629 ieee80211_free_keys(sdata, true); 630 skb_queue_purge(&sdata->skb_queue); 631 skb_queue_purge(&sdata->status_queue); 632 } 633 634 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 635 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 636 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 637 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 638 if (info->control.vif == &sdata->vif) { 639 __skb_unlink(skb, &local->pending[i]); 640 ieee80211_free_txskb(&local->hw, skb); 641 } 642 } 643 } 644 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 645 646 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 647 ieee80211_txq_remove_vlan(local, sdata); 648 649 sdata->bss = NULL; 650 651 if (local->open_count == 0) 652 ieee80211_clear_tx_pending(local); 653 654 sdata->vif.bss_conf.beacon_int = 0; 655 656 /* 657 * If the interface goes down while suspended, presumably because 658 * the device was unplugged and that happens before our resume, 659 * then the driver is already unconfigured and the remainder of 660 * this function isn't needed. 661 * XXX: what about WoWLAN? If the device has software state, e.g. 662 * memory allocated, it might expect teardown commands from 663 * mac80211 here? 664 */ 665 if (local->suspended) { 666 WARN_ON(local->wowlan); 667 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 668 return; 669 } 670 671 switch (sdata->vif.type) { 672 case NL80211_IFTYPE_AP_VLAN: 673 break; 674 case NL80211_IFTYPE_MONITOR: 675 if (local->monitors == 0) 676 ieee80211_del_virtual_monitor(local); 677 678 mutex_lock(&local->mtx); 679 ieee80211_recalc_idle(local); 680 mutex_unlock(&local->mtx); 681 682 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 683 break; 684 685 fallthrough; 686 default: 687 if (going_down) 688 drv_remove_interface(local, sdata); 689 } 690 691 ieee80211_recalc_ps(local); 692 693 if (cancel_scan) 694 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 695 696 if (local->open_count == 0) { 697 ieee80211_stop_device(local); 698 699 /* no reconfiguring after stop! */ 700 return; 701 } 702 703 /* do after stop to avoid reconfiguring when we stop anyway */ 704 ieee80211_configure_filter(local); 705 ieee80211_hw_config(local, hw_reconf_flags); 706 707 if (local->monitors == local->open_count) 708 ieee80211_add_virtual_monitor(local); 709 } 710 711 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 712 { 713 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 714 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 715 716 if (!tx_vif) 717 return; 718 719 tx_sdata = vif_to_sdata(tx_vif); 720 sdata->vif.mbssid_tx_vif = NULL; 721 722 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 723 &tx_sdata->local->interfaces, list) { 724 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 725 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 726 ieee80211_sdata_running(non_tx_sdata)) { 727 non_tx_sdata->vif.mbssid_tx_vif = NULL; 728 dev_close(non_tx_sdata->wdev.netdev); 729 } 730 } 731 732 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 733 tx_sdata->vif.mbssid_tx_vif = NULL; 734 dev_close(tx_sdata->wdev.netdev); 735 } 736 } 737 738 static int ieee80211_stop(struct net_device *dev) 739 { 740 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 741 742 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 743 if (sdata->vif.type == NL80211_IFTYPE_AP) { 744 struct ieee80211_sub_if_data *vlan, *tmpsdata; 745 746 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 747 u.vlan.list) 748 dev_close(vlan->dev); 749 750 ieee80211_stop_mbssid(sdata); 751 } 752 753 cancel_work_sync(&sdata->activate_links_work); 754 755 wiphy_lock(sdata->local->hw.wiphy); 756 ieee80211_do_stop(sdata, true); 757 wiphy_unlock(sdata->local->hw.wiphy); 758 759 return 0; 760 } 761 762 static void ieee80211_set_multicast_list(struct net_device *dev) 763 { 764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 765 struct ieee80211_local *local = sdata->local; 766 int allmulti, sdata_allmulti; 767 768 allmulti = !!(dev->flags & IFF_ALLMULTI); 769 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 770 771 if (allmulti != sdata_allmulti) { 772 if (dev->flags & IFF_ALLMULTI) 773 atomic_inc(&local->iff_allmultis); 774 else 775 atomic_dec(&local->iff_allmultis); 776 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 777 } 778 779 spin_lock_bh(&local->filter_lock); 780 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 781 spin_unlock_bh(&local->filter_lock); 782 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 783 } 784 785 /* 786 * Called when the netdev is removed or, by the code below, before 787 * the interface type changes. 788 */ 789 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 790 { 791 /* free extra data */ 792 ieee80211_free_keys(sdata, false); 793 794 ieee80211_debugfs_remove_netdev(sdata); 795 796 ieee80211_destroy_frag_cache(&sdata->frags); 797 798 if (ieee80211_vif_is_mesh(&sdata->vif)) 799 ieee80211_mesh_teardown_sdata(sdata); 800 801 ieee80211_vif_clear_links(sdata); 802 ieee80211_link_stop(&sdata->deflink); 803 } 804 805 static void ieee80211_uninit(struct net_device *dev) 806 { 807 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 808 } 809 810 static void 811 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 812 { 813 dev_fetch_sw_netstats(stats, dev->tstats); 814 } 815 816 static int ieee80211_netdev_setup_tc(struct net_device *dev, 817 enum tc_setup_type type, void *type_data) 818 { 819 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 820 struct ieee80211_local *local = sdata->local; 821 822 return drv_net_setup_tc(local, sdata, dev, type, type_data); 823 } 824 825 static const struct net_device_ops ieee80211_dataif_ops = { 826 .ndo_open = ieee80211_open, 827 .ndo_stop = ieee80211_stop, 828 .ndo_uninit = ieee80211_uninit, 829 .ndo_start_xmit = ieee80211_subif_start_xmit, 830 .ndo_set_rx_mode = ieee80211_set_multicast_list, 831 .ndo_set_mac_address = ieee80211_change_mac, 832 .ndo_get_stats64 = ieee80211_get_stats64, 833 .ndo_setup_tc = ieee80211_netdev_setup_tc, 834 }; 835 836 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 837 struct sk_buff *skb, 838 struct net_device *sb_dev) 839 { 840 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 841 struct ieee80211_local *local = sdata->local; 842 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 843 struct ieee80211_hdr *hdr; 844 int len_rthdr; 845 846 if (local->hw.queues < IEEE80211_NUM_ACS) 847 return 0; 848 849 /* reset flags and info before parsing radiotap header */ 850 memset(info, 0, sizeof(*info)); 851 852 if (!ieee80211_parse_tx_radiotap(skb, dev)) 853 return 0; /* doesn't matter, frame will be dropped */ 854 855 len_rthdr = ieee80211_get_radiotap_len(skb->data); 856 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 857 if (skb->len < len_rthdr + 2 || 858 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 859 return 0; /* doesn't matter, frame will be dropped */ 860 861 return ieee80211_select_queue_80211(sdata, skb, hdr); 862 } 863 864 static const struct net_device_ops ieee80211_monitorif_ops = { 865 .ndo_open = ieee80211_open, 866 .ndo_stop = ieee80211_stop, 867 .ndo_uninit = ieee80211_uninit, 868 .ndo_start_xmit = ieee80211_monitor_start_xmit, 869 .ndo_set_rx_mode = ieee80211_set_multicast_list, 870 .ndo_set_mac_address = ieee80211_change_mac, 871 .ndo_select_queue = ieee80211_monitor_select_queue, 872 .ndo_get_stats64 = ieee80211_get_stats64, 873 }; 874 875 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 876 struct net_device_path *path) 877 { 878 struct ieee80211_sub_if_data *sdata; 879 struct ieee80211_local *local; 880 struct sta_info *sta; 881 int ret = -ENOENT; 882 883 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 884 local = sdata->local; 885 886 if (!local->ops->net_fill_forward_path) 887 return -EOPNOTSUPP; 888 889 rcu_read_lock(); 890 switch (sdata->vif.type) { 891 case NL80211_IFTYPE_AP_VLAN: 892 sta = rcu_dereference(sdata->u.vlan.sta); 893 if (sta) 894 break; 895 if (sdata->wdev.use_4addr) 896 goto out; 897 if (is_multicast_ether_addr(ctx->daddr)) 898 goto out; 899 sta = sta_info_get_bss(sdata, ctx->daddr); 900 break; 901 case NL80211_IFTYPE_AP: 902 if (is_multicast_ether_addr(ctx->daddr)) 903 goto out; 904 sta = sta_info_get(sdata, ctx->daddr); 905 break; 906 case NL80211_IFTYPE_STATION: 907 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 908 sta = sta_info_get(sdata, ctx->daddr); 909 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 910 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 911 goto out; 912 913 break; 914 } 915 } 916 917 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 918 break; 919 default: 920 goto out; 921 } 922 923 if (!sta) 924 goto out; 925 926 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 927 out: 928 rcu_read_unlock(); 929 930 return ret; 931 } 932 933 static const struct net_device_ops ieee80211_dataif_8023_ops = { 934 .ndo_open = ieee80211_open, 935 .ndo_stop = ieee80211_stop, 936 .ndo_uninit = ieee80211_uninit, 937 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 938 .ndo_set_rx_mode = ieee80211_set_multicast_list, 939 .ndo_set_mac_address = ieee80211_change_mac, 940 .ndo_get_stats64 = ieee80211_get_stats64, 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 mutex_lock(&local->iflist_mtx); 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 mutex_unlock(&local->iflist_mtx); 1059 } 1060 1061 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1062 const int offset) 1063 { 1064 struct ieee80211_local *local = sdata->local; 1065 u32 flags = sdata->u.mntr.flags; 1066 1067 #define ADJUST(_f, _s) do { \ 1068 if (flags & MONITOR_FLAG_##_f) \ 1069 local->fif_##_s += offset; \ 1070 } while (0) 1071 1072 ADJUST(FCSFAIL, fcsfail); 1073 ADJUST(PLCPFAIL, plcpfail); 1074 ADJUST(CONTROL, control); 1075 ADJUST(CONTROL, pspoll); 1076 ADJUST(OTHER_BSS, other_bss); 1077 1078 #undef ADJUST 1079 } 1080 1081 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1082 { 1083 struct ieee80211_local *local = sdata->local; 1084 int i; 1085 1086 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1087 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1088 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1089 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1090 sdata->vif.hw_queue[i] = i; 1091 else 1092 sdata->vif.hw_queue[i] = 0; 1093 } 1094 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1095 } 1096 1097 static void ieee80211_sdata_init(struct ieee80211_local *local, 1098 struct ieee80211_sub_if_data *sdata) 1099 { 1100 sdata->local = local; 1101 1102 /* 1103 * Initialize the default link, so we can use link_id 0 for non-MLD, 1104 * and that continues to work for non-MLD-aware drivers that use just 1105 * vif.bss_conf instead of vif.link_conf. 1106 * 1107 * Note that we never change this, so if link ID 0 isn't used in an 1108 * MLD connection, we get a separate allocation for it. 1109 */ 1110 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1111 } 1112 1113 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1114 { 1115 struct ieee80211_sub_if_data *sdata; 1116 int ret; 1117 1118 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1119 return 0; 1120 1121 ASSERT_RTNL(); 1122 lockdep_assert_wiphy(local->hw.wiphy); 1123 1124 if (local->monitor_sdata) 1125 return 0; 1126 1127 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1128 if (!sdata) 1129 return -ENOMEM; 1130 1131 /* set up data */ 1132 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1133 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1134 wiphy_name(local->hw.wiphy)); 1135 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1136 mutex_init(&sdata->wdev.mtx); 1137 1138 ieee80211_sdata_init(local, sdata); 1139 1140 ieee80211_set_default_queues(sdata); 1141 1142 ret = drv_add_interface(local, sdata); 1143 if (WARN_ON(ret)) { 1144 /* ok .. stupid driver, it asked for this! */ 1145 kfree(sdata); 1146 return ret; 1147 } 1148 1149 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1150 1151 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1152 if (ret) { 1153 kfree(sdata); 1154 return ret; 1155 } 1156 1157 mutex_lock(&local->iflist_mtx); 1158 rcu_assign_pointer(local->monitor_sdata, sdata); 1159 mutex_unlock(&local->iflist_mtx); 1160 1161 sdata_lock(sdata); 1162 mutex_lock(&local->mtx); 1163 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef, 1164 IEEE80211_CHANCTX_EXCLUSIVE); 1165 mutex_unlock(&local->mtx); 1166 sdata_unlock(sdata); 1167 if (ret) { 1168 mutex_lock(&local->iflist_mtx); 1169 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1170 mutex_unlock(&local->iflist_mtx); 1171 synchronize_net(); 1172 drv_remove_interface(local, sdata); 1173 mutex_destroy(&sdata->wdev.mtx); 1174 kfree(sdata); 1175 return ret; 1176 } 1177 1178 skb_queue_head_init(&sdata->skb_queue); 1179 skb_queue_head_init(&sdata->status_queue); 1180 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1181 1182 return 0; 1183 } 1184 1185 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1186 { 1187 struct ieee80211_sub_if_data *sdata; 1188 1189 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1190 return; 1191 1192 ASSERT_RTNL(); 1193 lockdep_assert_wiphy(local->hw.wiphy); 1194 1195 mutex_lock(&local->iflist_mtx); 1196 1197 sdata = rcu_dereference_protected(local->monitor_sdata, 1198 lockdep_is_held(&local->iflist_mtx)); 1199 if (!sdata) { 1200 mutex_unlock(&local->iflist_mtx); 1201 return; 1202 } 1203 1204 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1205 mutex_unlock(&local->iflist_mtx); 1206 1207 synchronize_net(); 1208 1209 sdata_lock(sdata); 1210 mutex_lock(&local->mtx); 1211 ieee80211_link_release_channel(&sdata->deflink); 1212 mutex_unlock(&local->mtx); 1213 sdata_unlock(sdata); 1214 1215 drv_remove_interface(local, sdata); 1216 1217 mutex_destroy(&sdata->wdev.mtx); 1218 kfree(sdata); 1219 } 1220 1221 /* 1222 * NOTE: Be very careful when changing this function, it must NOT return 1223 * an error on interface type changes that have been pre-checked, so most 1224 * checks should be in ieee80211_check_concurrent_iface. 1225 */ 1226 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1227 { 1228 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1229 struct net_device *dev = wdev->netdev; 1230 struct ieee80211_local *local = sdata->local; 1231 u64 changed = 0; 1232 int res; 1233 u32 hw_reconf_flags = 0; 1234 1235 switch (sdata->vif.type) { 1236 case NL80211_IFTYPE_AP_VLAN: { 1237 struct ieee80211_sub_if_data *master; 1238 1239 if (!sdata->bss) 1240 return -ENOLINK; 1241 1242 mutex_lock(&local->mtx); 1243 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1244 mutex_unlock(&local->mtx); 1245 1246 master = container_of(sdata->bss, 1247 struct ieee80211_sub_if_data, u.ap); 1248 sdata->control_port_protocol = 1249 master->control_port_protocol; 1250 sdata->control_port_no_encrypt = 1251 master->control_port_no_encrypt; 1252 sdata->control_port_over_nl80211 = 1253 master->control_port_over_nl80211; 1254 sdata->control_port_no_preauth = 1255 master->control_port_no_preauth; 1256 sdata->vif.cab_queue = master->vif.cab_queue; 1257 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1258 sizeof(sdata->vif.hw_queue)); 1259 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 1260 1261 mutex_lock(&local->key_mtx); 1262 sdata->crypto_tx_tailroom_needed_cnt += 1263 master->crypto_tx_tailroom_needed_cnt; 1264 mutex_unlock(&local->key_mtx); 1265 1266 break; 1267 } 1268 case NL80211_IFTYPE_AP: 1269 sdata->bss = &sdata->u.ap; 1270 break; 1271 case NL80211_IFTYPE_MESH_POINT: 1272 case NL80211_IFTYPE_STATION: 1273 case NL80211_IFTYPE_MONITOR: 1274 case NL80211_IFTYPE_ADHOC: 1275 case NL80211_IFTYPE_P2P_DEVICE: 1276 case NL80211_IFTYPE_OCB: 1277 case NL80211_IFTYPE_NAN: 1278 /* no special treatment */ 1279 break; 1280 case NL80211_IFTYPE_UNSPECIFIED: 1281 case NUM_NL80211_IFTYPES: 1282 case NL80211_IFTYPE_P2P_CLIENT: 1283 case NL80211_IFTYPE_P2P_GO: 1284 case NL80211_IFTYPE_WDS: 1285 /* cannot happen */ 1286 WARN_ON(1); 1287 break; 1288 } 1289 1290 if (local->open_count == 0) { 1291 /* here we can consider everything in good order (again) */ 1292 local->reconfig_failure = false; 1293 1294 res = drv_start(local); 1295 if (res) 1296 goto err_del_bss; 1297 /* we're brought up, everything changes */ 1298 hw_reconf_flags = ~0; 1299 ieee80211_led_radio(local, true); 1300 ieee80211_mod_tpt_led_trig(local, 1301 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1302 } 1303 1304 /* 1305 * Copy the hopefully now-present MAC address to 1306 * this interface, if it has the special null one. 1307 */ 1308 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1309 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1310 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1311 1312 if (!is_valid_ether_addr(dev->dev_addr)) { 1313 res = -EADDRNOTAVAIL; 1314 goto err_stop; 1315 } 1316 } 1317 1318 switch (sdata->vif.type) { 1319 case NL80211_IFTYPE_AP_VLAN: 1320 /* no need to tell driver, but set carrier and chanctx */ 1321 if (sdata->bss->active) { 1322 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1323 netif_carrier_on(dev); 1324 ieee80211_set_vif_encap_ops(sdata); 1325 } else { 1326 netif_carrier_off(dev); 1327 } 1328 break; 1329 case NL80211_IFTYPE_MONITOR: 1330 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1331 local->cooked_mntrs++; 1332 break; 1333 } 1334 1335 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1336 res = drv_add_interface(local, sdata); 1337 if (res) 1338 goto err_stop; 1339 } else if (local->monitors == 0 && local->open_count == 0) { 1340 res = ieee80211_add_virtual_monitor(local); 1341 if (res) 1342 goto err_stop; 1343 } 1344 1345 /* must be before the call to ieee80211_configure_filter */ 1346 local->monitors++; 1347 if (local->monitors == 1) { 1348 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1349 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1350 } 1351 1352 ieee80211_adjust_monitor_flags(sdata, 1); 1353 ieee80211_configure_filter(local); 1354 ieee80211_recalc_offload(local); 1355 mutex_lock(&local->mtx); 1356 ieee80211_recalc_idle(local); 1357 mutex_unlock(&local->mtx); 1358 1359 netif_carrier_on(dev); 1360 break; 1361 default: 1362 if (coming_up) { 1363 ieee80211_del_virtual_monitor(local); 1364 ieee80211_set_sdata_offload_flags(sdata); 1365 1366 res = drv_add_interface(local, sdata); 1367 if (res) 1368 goto err_stop; 1369 1370 ieee80211_set_vif_encap_ops(sdata); 1371 res = ieee80211_check_queues(sdata, 1372 ieee80211_vif_type_p2p(&sdata->vif)); 1373 if (res) 1374 goto err_del_interface; 1375 } 1376 1377 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1378 local->fif_pspoll++; 1379 local->fif_probe_req++; 1380 1381 ieee80211_configure_filter(local); 1382 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1383 local->fif_probe_req++; 1384 } 1385 1386 if (sdata->vif.probe_req_reg) 1387 drv_config_iface_filter(local, sdata, 1388 FIF_PROBE_REQ, 1389 FIF_PROBE_REQ); 1390 1391 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1392 sdata->vif.type != NL80211_IFTYPE_NAN) 1393 changed |= ieee80211_reset_erp_info(sdata); 1394 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1395 changed); 1396 1397 switch (sdata->vif.type) { 1398 case NL80211_IFTYPE_STATION: 1399 case NL80211_IFTYPE_ADHOC: 1400 case NL80211_IFTYPE_AP: 1401 case NL80211_IFTYPE_MESH_POINT: 1402 case NL80211_IFTYPE_OCB: 1403 netif_carrier_off(dev); 1404 break; 1405 case NL80211_IFTYPE_P2P_DEVICE: 1406 case NL80211_IFTYPE_NAN: 1407 break; 1408 default: 1409 /* not reached */ 1410 WARN_ON(1); 1411 } 1412 1413 /* 1414 * Set default queue parameters so drivers don't 1415 * need to initialise the hardware if the hardware 1416 * doesn't start up with sane defaults. 1417 * Enable QoS for anything but station interfaces. 1418 */ 1419 ieee80211_set_wmm_default(&sdata->deflink, true, 1420 sdata->vif.type != NL80211_IFTYPE_STATION); 1421 } 1422 1423 switch (sdata->vif.type) { 1424 case NL80211_IFTYPE_P2P_DEVICE: 1425 rcu_assign_pointer(local->p2p_sdata, sdata); 1426 break; 1427 case NL80211_IFTYPE_MONITOR: 1428 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1429 break; 1430 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1431 break; 1432 default: 1433 break; 1434 } 1435 1436 /* 1437 * set_multicast_list will be invoked by the networking core 1438 * which will check whether any increments here were done in 1439 * error and sync them down to the hardware as filter flags. 1440 */ 1441 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1442 atomic_inc(&local->iff_allmultis); 1443 1444 if (coming_up) 1445 local->open_count++; 1446 1447 if (hw_reconf_flags) 1448 ieee80211_hw_config(local, hw_reconf_flags); 1449 1450 ieee80211_recalc_ps(local); 1451 1452 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1453 1454 return 0; 1455 err_del_interface: 1456 drv_remove_interface(local, sdata); 1457 err_stop: 1458 if (!local->open_count) 1459 drv_stop(local); 1460 err_del_bss: 1461 sdata->bss = NULL; 1462 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1463 mutex_lock(&local->mtx); 1464 list_del(&sdata->u.vlan.list); 1465 mutex_unlock(&local->mtx); 1466 } 1467 /* might already be clear but that doesn't matter */ 1468 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1469 return res; 1470 } 1471 1472 static void ieee80211_if_free(struct net_device *dev) 1473 { 1474 free_percpu(dev->tstats); 1475 } 1476 1477 static void ieee80211_if_setup(struct net_device *dev) 1478 { 1479 ether_setup(dev); 1480 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1481 dev->priv_flags |= IFF_NO_QUEUE; 1482 dev->netdev_ops = &ieee80211_dataif_ops; 1483 dev->needs_free_netdev = true; 1484 dev->priv_destructor = ieee80211_if_free; 1485 } 1486 1487 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1488 struct ieee80211_sub_if_data *sdata, 1489 struct sk_buff *skb) 1490 { 1491 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1492 1493 if (ieee80211_is_action(mgmt->frame_control) && 1494 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1495 struct sta_info *sta; 1496 int len = skb->len; 1497 1498 mutex_lock(&local->sta_mtx); 1499 sta = sta_info_get_bss(sdata, mgmt->sa); 1500 if (sta) { 1501 switch (mgmt->u.action.u.addba_req.action_code) { 1502 case WLAN_ACTION_ADDBA_REQ: 1503 ieee80211_process_addba_request(local, sta, 1504 mgmt, len); 1505 break; 1506 case WLAN_ACTION_ADDBA_RESP: 1507 ieee80211_process_addba_resp(local, sta, 1508 mgmt, len); 1509 break; 1510 case WLAN_ACTION_DELBA: 1511 ieee80211_process_delba(sdata, sta, 1512 mgmt, len); 1513 break; 1514 default: 1515 WARN_ON(1); 1516 break; 1517 } 1518 } 1519 mutex_unlock(&local->sta_mtx); 1520 } else if (ieee80211_is_action(mgmt->frame_control) && 1521 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1522 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1523 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1524 struct ieee80211_rx_status *status; 1525 enum nl80211_band band; 1526 struct sta_info *sta; 1527 u8 opmode; 1528 1529 status = IEEE80211_SKB_RXCB(skb); 1530 band = status->band; 1531 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1532 1533 mutex_lock(&local->sta_mtx); 1534 sta = sta_info_get_bss(sdata, mgmt->sa); 1535 1536 if (sta) 1537 ieee80211_vht_handle_opmode(sdata, 1538 &sta->deflink, 1539 opmode, band); 1540 1541 mutex_unlock(&local->sta_mtx); 1542 break; 1543 } 1544 case WLAN_VHT_ACTION_GROUPID_MGMT: 1545 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1546 mgmt); 1547 break; 1548 default: 1549 WARN_ON(1); 1550 break; 1551 } 1552 } else if (ieee80211_is_action(mgmt->frame_control) && 1553 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1554 switch (mgmt->u.action.u.s1g.action_code) { 1555 case WLAN_S1G_TWT_TEARDOWN: 1556 case WLAN_S1G_TWT_SETUP: 1557 ieee80211_s1g_rx_twt_action(sdata, skb); 1558 break; 1559 default: 1560 break; 1561 } 1562 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1563 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1564 ieee80211_sta_rx_queued_ext(sdata, skb); 1565 else 1566 WARN_ON(1); 1567 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1568 struct ieee80211_hdr *hdr = (void *)mgmt; 1569 struct sta_info *sta; 1570 1571 /* 1572 * So the frame isn't mgmt, but frame_control 1573 * is at the right place anyway, of course, so 1574 * the if statement is correct. 1575 * 1576 * Warn if we have other data frame types here, 1577 * they must not get here. 1578 */ 1579 WARN_ON(hdr->frame_control & 1580 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1581 WARN_ON(!(hdr->seq_ctrl & 1582 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1583 /* 1584 * This was a fragment of a frame, received while 1585 * a block-ack session was active. That cannot be 1586 * right, so terminate the session. 1587 */ 1588 mutex_lock(&local->sta_mtx); 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 mutex_unlock(&local->sta_mtx); 1599 } else switch (sdata->vif.type) { 1600 case NL80211_IFTYPE_STATION: 1601 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1602 break; 1603 case NL80211_IFTYPE_ADHOC: 1604 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1605 break; 1606 case NL80211_IFTYPE_MESH_POINT: 1607 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1608 break; 1609 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1610 break; 1611 default: 1612 WARN(1, "frame for unexpected interface type"); 1613 break; 1614 } 1615 } 1616 1617 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1618 struct sk_buff *skb) 1619 { 1620 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1621 1622 if (ieee80211_is_action(mgmt->frame_control) && 1623 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1624 switch (mgmt->u.action.u.s1g.action_code) { 1625 case WLAN_S1G_TWT_TEARDOWN: 1626 case WLAN_S1G_TWT_SETUP: 1627 ieee80211_s1g_status_twt_action(sdata, skb); 1628 break; 1629 default: 1630 break; 1631 } 1632 } 1633 } 1634 1635 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1636 { 1637 struct ieee80211_sub_if_data *sdata = 1638 container_of(work, struct ieee80211_sub_if_data, work); 1639 struct ieee80211_local *local = sdata->local; 1640 struct sk_buff *skb; 1641 1642 if (!ieee80211_sdata_running(sdata)) 1643 return; 1644 1645 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1646 return; 1647 1648 if (!ieee80211_can_run_worker(local)) 1649 return; 1650 1651 /* first process frames */ 1652 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1653 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1654 1655 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1656 ieee80211_process_tdls_channel_switch(sdata, skb); 1657 else 1658 ieee80211_iface_process_skb(local, sdata, skb); 1659 1660 kfree_skb(skb); 1661 kcov_remote_stop(); 1662 } 1663 1664 /* process status queue */ 1665 while ((skb = skb_dequeue(&sdata->status_queue))) { 1666 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1667 1668 ieee80211_iface_process_status(sdata, skb); 1669 kfree_skb(skb); 1670 1671 kcov_remote_stop(); 1672 } 1673 1674 /* then other type-dependent work */ 1675 switch (sdata->vif.type) { 1676 case NL80211_IFTYPE_STATION: 1677 ieee80211_sta_work(sdata); 1678 break; 1679 case NL80211_IFTYPE_ADHOC: 1680 ieee80211_ibss_work(sdata); 1681 break; 1682 case NL80211_IFTYPE_MESH_POINT: 1683 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1684 break; 1685 ieee80211_mesh_work(sdata); 1686 break; 1687 case NL80211_IFTYPE_OCB: 1688 ieee80211_ocb_work(sdata); 1689 break; 1690 default: 1691 break; 1692 } 1693 } 1694 1695 static void ieee80211_recalc_smps_work(struct work_struct *work) 1696 { 1697 struct ieee80211_sub_if_data *sdata = 1698 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1699 1700 ieee80211_recalc_smps(sdata, &sdata->deflink); 1701 } 1702 1703 static void ieee80211_activate_links_work(struct work_struct *work) 1704 { 1705 struct ieee80211_sub_if_data *sdata = 1706 container_of(work, struct ieee80211_sub_if_data, 1707 activate_links_work); 1708 1709 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1710 } 1711 1712 /* 1713 * Helper function to initialise an interface to a specific type. 1714 */ 1715 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1716 enum nl80211_iftype type) 1717 { 1718 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1719 0xff, 0xff, 0xff}; 1720 1721 /* clear type-dependent unions */ 1722 memset(&sdata->u, 0, sizeof(sdata->u)); 1723 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1724 1725 /* and set some type-dependent values */ 1726 sdata->vif.type = type; 1727 sdata->vif.p2p = false; 1728 sdata->wdev.iftype = type; 1729 1730 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1731 sdata->control_port_no_encrypt = false; 1732 sdata->control_port_over_nl80211 = false; 1733 sdata->control_port_no_preauth = false; 1734 sdata->vif.cfg.idle = true; 1735 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1736 1737 sdata->noack_map = 0; 1738 1739 /* only monitor/p2p-device differ */ 1740 if (sdata->dev) { 1741 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1742 sdata->dev->type = ARPHRD_ETHER; 1743 } 1744 1745 skb_queue_head_init(&sdata->skb_queue); 1746 skb_queue_head_init(&sdata->status_queue); 1747 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1748 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1749 INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work); 1750 1751 switch (type) { 1752 case NL80211_IFTYPE_P2P_GO: 1753 type = NL80211_IFTYPE_AP; 1754 sdata->vif.type = type; 1755 sdata->vif.p2p = true; 1756 fallthrough; 1757 case NL80211_IFTYPE_AP: 1758 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1759 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1760 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1761 break; 1762 case NL80211_IFTYPE_P2P_CLIENT: 1763 type = NL80211_IFTYPE_STATION; 1764 sdata->vif.type = type; 1765 sdata->vif.p2p = true; 1766 fallthrough; 1767 case NL80211_IFTYPE_STATION: 1768 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1769 ieee80211_sta_setup_sdata(sdata); 1770 break; 1771 case NL80211_IFTYPE_OCB: 1772 sdata->vif.bss_conf.bssid = bssid_wildcard; 1773 ieee80211_ocb_setup_sdata(sdata); 1774 break; 1775 case NL80211_IFTYPE_ADHOC: 1776 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1777 ieee80211_ibss_setup_sdata(sdata); 1778 break; 1779 case NL80211_IFTYPE_MESH_POINT: 1780 if (ieee80211_vif_is_mesh(&sdata->vif)) 1781 ieee80211_mesh_init_sdata(sdata); 1782 break; 1783 case NL80211_IFTYPE_MONITOR: 1784 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1785 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1786 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1787 MONITOR_FLAG_OTHER_BSS; 1788 break; 1789 case NL80211_IFTYPE_NAN: 1790 idr_init(&sdata->u.nan.function_inst_ids); 1791 spin_lock_init(&sdata->u.nan.func_lock); 1792 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1793 break; 1794 case NL80211_IFTYPE_AP_VLAN: 1795 case NL80211_IFTYPE_P2P_DEVICE: 1796 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1797 break; 1798 case NL80211_IFTYPE_UNSPECIFIED: 1799 case NL80211_IFTYPE_WDS: 1800 case NUM_NL80211_IFTYPES: 1801 WARN_ON(1); 1802 break; 1803 } 1804 1805 /* need to do this after the switch so vif.type is correct */ 1806 ieee80211_link_setup(&sdata->deflink); 1807 1808 ieee80211_debugfs_add_netdev(sdata); 1809 } 1810 1811 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1812 enum nl80211_iftype type) 1813 { 1814 struct ieee80211_local *local = sdata->local; 1815 int ret, err; 1816 enum nl80211_iftype internal_type = type; 1817 bool p2p = false; 1818 1819 ASSERT_RTNL(); 1820 1821 if (!local->ops->change_interface) 1822 return -EBUSY; 1823 1824 /* for now, don't support changing while links exist */ 1825 if (ieee80211_vif_is_mld(&sdata->vif)) 1826 return -EBUSY; 1827 1828 switch (sdata->vif.type) { 1829 case NL80211_IFTYPE_AP: 1830 if (!list_empty(&sdata->u.ap.vlans)) 1831 return -EBUSY; 1832 break; 1833 case NL80211_IFTYPE_STATION: 1834 case NL80211_IFTYPE_ADHOC: 1835 case NL80211_IFTYPE_OCB: 1836 /* 1837 * Could maybe also all others here? 1838 * Just not sure how that interacts 1839 * with the RX/config path e.g. for 1840 * mesh. 1841 */ 1842 break; 1843 default: 1844 return -EBUSY; 1845 } 1846 1847 switch (type) { 1848 case NL80211_IFTYPE_AP: 1849 case NL80211_IFTYPE_STATION: 1850 case NL80211_IFTYPE_ADHOC: 1851 case NL80211_IFTYPE_OCB: 1852 /* 1853 * Could probably support everything 1854 * but here. 1855 */ 1856 break; 1857 case NL80211_IFTYPE_P2P_CLIENT: 1858 p2p = true; 1859 internal_type = NL80211_IFTYPE_STATION; 1860 break; 1861 case NL80211_IFTYPE_P2P_GO: 1862 p2p = true; 1863 internal_type = NL80211_IFTYPE_AP; 1864 break; 1865 default: 1866 return -EBUSY; 1867 } 1868 1869 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1870 if (ret) 1871 return ret; 1872 1873 ieee80211_stop_vif_queues(local, sdata, 1874 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1875 /* do_stop will synchronize_rcu() first thing */ 1876 ieee80211_do_stop(sdata, false); 1877 1878 ieee80211_teardown_sdata(sdata); 1879 1880 ieee80211_set_sdata_offload_flags(sdata); 1881 ret = drv_change_interface(local, sdata, internal_type, p2p); 1882 if (ret) 1883 type = ieee80211_vif_type_p2p(&sdata->vif); 1884 1885 /* 1886 * Ignore return value here, there's not much we can do since 1887 * the driver changed the interface type internally already. 1888 * The warnings will hopefully make driver authors fix it :-) 1889 */ 1890 ieee80211_check_queues(sdata, type); 1891 1892 ieee80211_setup_sdata(sdata, type); 1893 ieee80211_set_vif_encap_ops(sdata); 1894 1895 err = ieee80211_do_open(&sdata->wdev, false); 1896 WARN(err, "type change: do_open returned %d", err); 1897 1898 ieee80211_wake_vif_queues(local, sdata, 1899 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1900 return ret; 1901 } 1902 1903 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1904 enum nl80211_iftype type) 1905 { 1906 int ret; 1907 1908 ASSERT_RTNL(); 1909 1910 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1911 return 0; 1912 1913 if (ieee80211_sdata_running(sdata)) { 1914 ret = ieee80211_runtime_change_iftype(sdata, type); 1915 if (ret) 1916 return ret; 1917 } else { 1918 /* Purge and reset type-dependent state. */ 1919 ieee80211_teardown_sdata(sdata); 1920 ieee80211_setup_sdata(sdata, type); 1921 } 1922 1923 /* reset some values that shouldn't be kept across type changes */ 1924 if (type == NL80211_IFTYPE_STATION) 1925 sdata->u.mgd.use_4addr = false; 1926 1927 return 0; 1928 } 1929 1930 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1931 u8 *perm_addr, enum nl80211_iftype type) 1932 { 1933 struct ieee80211_sub_if_data *sdata; 1934 u64 mask, start, addr, val, inc; 1935 u8 *m; 1936 u8 tmp_addr[ETH_ALEN]; 1937 int i; 1938 1939 /* default ... something at least */ 1940 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1941 1942 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1943 local->hw.wiphy->n_addresses <= 1) 1944 return; 1945 1946 mutex_lock(&local->iflist_mtx); 1947 1948 switch (type) { 1949 case NL80211_IFTYPE_MONITOR: 1950 /* doesn't matter */ 1951 break; 1952 case NL80211_IFTYPE_AP_VLAN: 1953 /* match up with an AP interface */ 1954 list_for_each_entry(sdata, &local->interfaces, list) { 1955 if (sdata->vif.type != NL80211_IFTYPE_AP) 1956 continue; 1957 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1958 break; 1959 } 1960 /* keep default if no AP interface present */ 1961 break; 1962 case NL80211_IFTYPE_P2P_CLIENT: 1963 case NL80211_IFTYPE_P2P_GO: 1964 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1965 list_for_each_entry(sdata, &local->interfaces, list) { 1966 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1967 continue; 1968 if (!ieee80211_sdata_running(sdata)) 1969 continue; 1970 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1971 goto out_unlock; 1972 } 1973 } 1974 fallthrough; 1975 default: 1976 /* assign a new address if possible -- try n_addresses first */ 1977 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1978 bool used = false; 1979 1980 list_for_each_entry(sdata, &local->interfaces, list) { 1981 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1982 sdata->vif.addr)) { 1983 used = true; 1984 break; 1985 } 1986 } 1987 1988 if (!used) { 1989 memcpy(perm_addr, 1990 local->hw.wiphy->addresses[i].addr, 1991 ETH_ALEN); 1992 break; 1993 } 1994 } 1995 1996 /* try mask if available */ 1997 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1998 break; 1999 2000 m = local->hw.wiphy->addr_mask; 2001 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2002 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2003 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2004 2005 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2006 /* not a contiguous mask ... not handled now! */ 2007 pr_info("not contiguous\n"); 2008 break; 2009 } 2010 2011 /* 2012 * Pick address of existing interface in case user changed 2013 * MAC address manually, default to perm_addr. 2014 */ 2015 m = local->hw.wiphy->perm_addr; 2016 list_for_each_entry(sdata, &local->interfaces, list) { 2017 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2018 continue; 2019 m = sdata->vif.addr; 2020 break; 2021 } 2022 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2023 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2024 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2025 2026 inc = 1ULL<<__ffs64(mask); 2027 val = (start & mask); 2028 addr = (start & ~mask) | (val & mask); 2029 do { 2030 bool used = false; 2031 2032 tmp_addr[5] = addr >> 0*8; 2033 tmp_addr[4] = addr >> 1*8; 2034 tmp_addr[3] = addr >> 2*8; 2035 tmp_addr[2] = addr >> 3*8; 2036 tmp_addr[1] = addr >> 4*8; 2037 tmp_addr[0] = addr >> 5*8; 2038 2039 val += inc; 2040 2041 list_for_each_entry(sdata, &local->interfaces, list) { 2042 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2043 used = true; 2044 break; 2045 } 2046 } 2047 2048 if (!used) { 2049 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2050 break; 2051 } 2052 addr = (start & ~mask) | (val & mask); 2053 } while (addr != start); 2054 2055 break; 2056 } 2057 2058 out_unlock: 2059 mutex_unlock(&local->iflist_mtx); 2060 } 2061 2062 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2063 unsigned char name_assign_type, 2064 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2065 struct vif_params *params) 2066 { 2067 struct net_device *ndev = NULL; 2068 struct ieee80211_sub_if_data *sdata = NULL; 2069 struct txq_info *txqi; 2070 int ret, i; 2071 2072 ASSERT_RTNL(); 2073 2074 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2075 struct wireless_dev *wdev; 2076 2077 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2078 GFP_KERNEL); 2079 if (!sdata) 2080 return -ENOMEM; 2081 wdev = &sdata->wdev; 2082 2083 sdata->dev = NULL; 2084 strscpy(sdata->name, name, IFNAMSIZ); 2085 ieee80211_assign_perm_addr(local, wdev->address, type); 2086 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2087 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2088 } else { 2089 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2090 sizeof(void *)); 2091 int txq_size = 0; 2092 2093 if (type != NL80211_IFTYPE_AP_VLAN && 2094 (type != NL80211_IFTYPE_MONITOR || 2095 (params->flags & MONITOR_FLAG_ACTIVE))) 2096 txq_size += sizeof(struct txq_info) + 2097 local->hw.txq_data_size; 2098 2099 ndev = alloc_netdev_mqs(size + txq_size, 2100 name, name_assign_type, 2101 ieee80211_if_setup, 1, 1); 2102 if (!ndev) 2103 return -ENOMEM; 2104 2105 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2106 2107 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2108 if (!ndev->tstats) { 2109 free_netdev(ndev); 2110 return -ENOMEM; 2111 } 2112 2113 ndev->needed_headroom = local->tx_headroom + 2114 4*6 /* four MAC addresses */ 2115 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2116 + 6 /* mesh */ 2117 + 8 /* rfc1042/bridge tunnel */ 2118 - ETH_HLEN /* ethernet hard_header_len */ 2119 + IEEE80211_ENCRYPT_HEADROOM; 2120 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2121 2122 ret = dev_alloc_name(ndev, ndev->name); 2123 if (ret < 0) { 2124 ieee80211_if_free(ndev); 2125 free_netdev(ndev); 2126 return ret; 2127 } 2128 2129 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2130 if (is_valid_ether_addr(params->macaddr)) 2131 eth_hw_addr_set(ndev, params->macaddr); 2132 else 2133 eth_hw_addr_set(ndev, ndev->perm_addr); 2134 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2135 2136 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2137 sdata = netdev_priv(ndev); 2138 ndev->ieee80211_ptr = &sdata->wdev; 2139 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2140 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2141 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2142 2143 if (txq_size) { 2144 txqi = netdev_priv(ndev) + size; 2145 ieee80211_txq_init(sdata, NULL, txqi, 0); 2146 } 2147 2148 sdata->dev = ndev; 2149 } 2150 2151 /* initialise type-independent data */ 2152 sdata->wdev.wiphy = local->hw.wiphy; 2153 2154 ieee80211_sdata_init(local, sdata); 2155 2156 ieee80211_init_frag_cache(&sdata->frags); 2157 2158 INIT_LIST_HEAD(&sdata->key_list); 2159 2160 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 2161 ieee80211_delayed_tailroom_dec); 2162 2163 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2164 struct ieee80211_supported_band *sband; 2165 sband = local->hw.wiphy->bands[i]; 2166 sdata->rc_rateidx_mask[i] = 2167 sband ? (1 << sband->n_bitrates) - 1 : 0; 2168 if (sband) { 2169 __le16 cap; 2170 u16 *vht_rate_mask; 2171 2172 memcpy(sdata->rc_rateidx_mcs_mask[i], 2173 sband->ht_cap.mcs.rx_mask, 2174 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2175 2176 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2177 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2178 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2179 } else { 2180 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2181 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2182 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2183 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2184 } 2185 } 2186 2187 ieee80211_set_default_queues(sdata); 2188 2189 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2190 sdata->deflink.user_power_level = local->user_power_level; 2191 2192 /* setup type-dependent data */ 2193 ieee80211_setup_sdata(sdata, type); 2194 2195 if (ndev) { 2196 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2197 if (type == NL80211_IFTYPE_STATION) 2198 sdata->u.mgd.use_4addr = params->use_4addr; 2199 2200 ndev->features |= local->hw.netdev_features; 2201 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2202 ndev->hw_features |= ndev->features & 2203 MAC80211_SUPPORTED_FEATURES_TX; 2204 sdata->vif.netdev_features = local->hw.netdev_features; 2205 2206 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2207 2208 /* MTU range is normally 256 - 2304, where the upper limit is 2209 * the maximum MSDU size. Monitor interfaces send and receive 2210 * MPDU and A-MSDU frames which may be much larger so we do 2211 * not impose an upper limit in that case. 2212 */ 2213 ndev->min_mtu = 256; 2214 if (type == NL80211_IFTYPE_MONITOR) 2215 ndev->max_mtu = 0; 2216 else 2217 ndev->max_mtu = local->hw.max_mtu; 2218 2219 ret = cfg80211_register_netdevice(ndev); 2220 if (ret) { 2221 free_netdev(ndev); 2222 return ret; 2223 } 2224 } 2225 2226 mutex_lock(&local->iflist_mtx); 2227 list_add_tail_rcu(&sdata->list, &local->interfaces); 2228 mutex_unlock(&local->iflist_mtx); 2229 2230 if (new_wdev) 2231 *new_wdev = &sdata->wdev; 2232 2233 return 0; 2234 } 2235 2236 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2237 { 2238 ASSERT_RTNL(); 2239 2240 mutex_lock(&sdata->local->iflist_mtx); 2241 list_del_rcu(&sdata->list); 2242 mutex_unlock(&sdata->local->iflist_mtx); 2243 2244 if (sdata->vif.txq) 2245 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2246 2247 synchronize_rcu(); 2248 2249 cfg80211_unregister_wdev(&sdata->wdev); 2250 2251 if (!sdata->dev) { 2252 ieee80211_teardown_sdata(sdata); 2253 kfree(sdata); 2254 } 2255 } 2256 2257 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2258 { 2259 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2260 return; 2261 ieee80211_do_stop(sdata, true); 2262 } 2263 2264 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2265 { 2266 struct ieee80211_sub_if_data *sdata, *tmp; 2267 LIST_HEAD(unreg_list); 2268 2269 ASSERT_RTNL(); 2270 2271 /* Before destroying the interfaces, make sure they're all stopped so 2272 * that the hardware is stopped. Otherwise, the driver might still be 2273 * iterating the interfaces during the shutdown, e.g. from a worker 2274 * or from RX processing or similar, and if it does so (using atomic 2275 * iteration) while we're manipulating the list, the iteration will 2276 * crash. 2277 * 2278 * After this, the hardware should be stopped and the driver should 2279 * have stopped all of its activities, so that we can do RCU-unaware 2280 * manipulations of the interface list below. 2281 */ 2282 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2283 2284 WARN(local->open_count, "%s: open count remains %d\n", 2285 wiphy_name(local->hw.wiphy), local->open_count); 2286 2287 ieee80211_txq_teardown_flows(local); 2288 2289 mutex_lock(&local->iflist_mtx); 2290 list_splice_init(&local->interfaces, &unreg_list); 2291 mutex_unlock(&local->iflist_mtx); 2292 2293 wiphy_lock(local->hw.wiphy); 2294 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2295 bool netdev = sdata->dev; 2296 2297 list_del(&sdata->list); 2298 cfg80211_unregister_wdev(&sdata->wdev); 2299 2300 if (!netdev) 2301 kfree(sdata); 2302 } 2303 wiphy_unlock(local->hw.wiphy); 2304 } 2305 2306 static int netdev_notify(struct notifier_block *nb, 2307 unsigned long state, void *ptr) 2308 { 2309 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2310 struct ieee80211_sub_if_data *sdata; 2311 2312 if (state != NETDEV_CHANGENAME) 2313 return NOTIFY_DONE; 2314 2315 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2316 return NOTIFY_DONE; 2317 2318 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2319 return NOTIFY_DONE; 2320 2321 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2322 memcpy(sdata->name, dev->name, IFNAMSIZ); 2323 ieee80211_debugfs_rename_netdev(sdata); 2324 2325 return NOTIFY_OK; 2326 } 2327 2328 static struct notifier_block mac80211_netdev_notifier = { 2329 .notifier_call = netdev_notify, 2330 }; 2331 2332 int ieee80211_iface_init(void) 2333 { 2334 return register_netdevice_notifier(&mac80211_netdev_notifier); 2335 } 2336 2337 void ieee80211_iface_exit(void) 2338 { 2339 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2340 } 2341 2342 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2343 { 2344 if (sdata->vif.type == NL80211_IFTYPE_AP) 2345 atomic_inc(&sdata->u.ap.num_mcast_sta); 2346 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2347 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2348 } 2349 2350 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2351 { 2352 if (sdata->vif.type == NL80211_IFTYPE_AP) 2353 atomic_dec(&sdata->u.ap.num_mcast_sta); 2354 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2355 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2356 } 2357