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) 2018-2022 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 work_struct *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(sdata->vif.valid_links, 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 cancel_work_sync(&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 flush_delayed_work(&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 1137 ieee80211_sdata_init(local, sdata); 1138 1139 ieee80211_set_default_queues(sdata); 1140 1141 ret = drv_add_interface(local, sdata); 1142 if (WARN_ON(ret)) { 1143 /* ok .. stupid driver, it asked for this! */ 1144 kfree(sdata); 1145 return ret; 1146 } 1147 1148 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1149 1150 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1151 if (ret) { 1152 kfree(sdata); 1153 return ret; 1154 } 1155 1156 mutex_lock(&local->iflist_mtx); 1157 rcu_assign_pointer(local->monitor_sdata, sdata); 1158 mutex_unlock(&local->iflist_mtx); 1159 1160 mutex_lock(&local->mtx); 1161 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef, 1162 IEEE80211_CHANCTX_EXCLUSIVE); 1163 mutex_unlock(&local->mtx); 1164 if (ret) { 1165 mutex_lock(&local->iflist_mtx); 1166 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1167 mutex_unlock(&local->iflist_mtx); 1168 synchronize_net(); 1169 drv_remove_interface(local, sdata); 1170 kfree(sdata); 1171 return ret; 1172 } 1173 1174 skb_queue_head_init(&sdata->skb_queue); 1175 skb_queue_head_init(&sdata->status_queue); 1176 INIT_WORK(&sdata->work, ieee80211_iface_work); 1177 1178 return 0; 1179 } 1180 1181 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1182 { 1183 struct ieee80211_sub_if_data *sdata; 1184 1185 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1186 return; 1187 1188 ASSERT_RTNL(); 1189 lockdep_assert_wiphy(local->hw.wiphy); 1190 1191 mutex_lock(&local->iflist_mtx); 1192 1193 sdata = rcu_dereference_protected(local->monitor_sdata, 1194 lockdep_is_held(&local->iflist_mtx)); 1195 if (!sdata) { 1196 mutex_unlock(&local->iflist_mtx); 1197 return; 1198 } 1199 1200 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1201 mutex_unlock(&local->iflist_mtx); 1202 1203 synchronize_net(); 1204 1205 mutex_lock(&local->mtx); 1206 ieee80211_link_release_channel(&sdata->deflink); 1207 mutex_unlock(&local->mtx); 1208 1209 drv_remove_interface(local, sdata); 1210 1211 kfree(sdata); 1212 } 1213 1214 /* 1215 * NOTE: Be very careful when changing this function, it must NOT return 1216 * an error on interface type changes that have been pre-checked, so most 1217 * checks should be in ieee80211_check_concurrent_iface. 1218 */ 1219 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1220 { 1221 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1222 struct net_device *dev = wdev->netdev; 1223 struct ieee80211_local *local = sdata->local; 1224 u32 changed = 0; 1225 int res; 1226 u32 hw_reconf_flags = 0; 1227 1228 switch (sdata->vif.type) { 1229 case NL80211_IFTYPE_AP_VLAN: { 1230 struct ieee80211_sub_if_data *master; 1231 1232 if (!sdata->bss) 1233 return -ENOLINK; 1234 1235 mutex_lock(&local->mtx); 1236 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1237 mutex_unlock(&local->mtx); 1238 1239 master = container_of(sdata->bss, 1240 struct ieee80211_sub_if_data, u.ap); 1241 sdata->control_port_protocol = 1242 master->control_port_protocol; 1243 sdata->control_port_no_encrypt = 1244 master->control_port_no_encrypt; 1245 sdata->control_port_over_nl80211 = 1246 master->control_port_over_nl80211; 1247 sdata->control_port_no_preauth = 1248 master->control_port_no_preauth; 1249 sdata->vif.cab_queue = master->vif.cab_queue; 1250 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1251 sizeof(sdata->vif.hw_queue)); 1252 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 1253 1254 mutex_lock(&local->key_mtx); 1255 sdata->crypto_tx_tailroom_needed_cnt += 1256 master->crypto_tx_tailroom_needed_cnt; 1257 mutex_unlock(&local->key_mtx); 1258 1259 break; 1260 } 1261 case NL80211_IFTYPE_AP: 1262 sdata->bss = &sdata->u.ap; 1263 break; 1264 case NL80211_IFTYPE_MESH_POINT: 1265 case NL80211_IFTYPE_STATION: 1266 case NL80211_IFTYPE_MONITOR: 1267 case NL80211_IFTYPE_ADHOC: 1268 case NL80211_IFTYPE_P2P_DEVICE: 1269 case NL80211_IFTYPE_OCB: 1270 case NL80211_IFTYPE_NAN: 1271 /* no special treatment */ 1272 break; 1273 case NL80211_IFTYPE_UNSPECIFIED: 1274 case NUM_NL80211_IFTYPES: 1275 case NL80211_IFTYPE_P2P_CLIENT: 1276 case NL80211_IFTYPE_P2P_GO: 1277 case NL80211_IFTYPE_WDS: 1278 /* cannot happen */ 1279 WARN_ON(1); 1280 break; 1281 } 1282 1283 if (local->open_count == 0) { 1284 res = drv_start(local); 1285 if (res) 1286 goto err_del_bss; 1287 /* we're brought up, everything changes */ 1288 hw_reconf_flags = ~0; 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 mutex_lock(&local->mtx); 1346 ieee80211_recalc_idle(local); 1347 mutex_unlock(&local->mtx); 1348 1349 netif_carrier_on(dev); 1350 break; 1351 default: 1352 if (coming_up) { 1353 ieee80211_del_virtual_monitor(local); 1354 ieee80211_set_sdata_offload_flags(sdata); 1355 1356 res = drv_add_interface(local, sdata); 1357 if (res) 1358 goto err_stop; 1359 1360 ieee80211_set_vif_encap_ops(sdata); 1361 res = ieee80211_check_queues(sdata, 1362 ieee80211_vif_type_p2p(&sdata->vif)); 1363 if (res) 1364 goto err_del_interface; 1365 } 1366 1367 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1368 local->fif_pspoll++; 1369 local->fif_probe_req++; 1370 1371 ieee80211_configure_filter(local); 1372 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1373 local->fif_probe_req++; 1374 } 1375 1376 if (sdata->vif.probe_req_reg) 1377 drv_config_iface_filter(local, sdata, 1378 FIF_PROBE_REQ, 1379 FIF_PROBE_REQ); 1380 1381 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1382 sdata->vif.type != NL80211_IFTYPE_NAN) 1383 changed |= ieee80211_reset_erp_info(sdata); 1384 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1385 changed); 1386 1387 switch (sdata->vif.type) { 1388 case NL80211_IFTYPE_STATION: 1389 case NL80211_IFTYPE_ADHOC: 1390 case NL80211_IFTYPE_AP: 1391 case NL80211_IFTYPE_MESH_POINT: 1392 case NL80211_IFTYPE_OCB: 1393 netif_carrier_off(dev); 1394 break; 1395 case NL80211_IFTYPE_P2P_DEVICE: 1396 case NL80211_IFTYPE_NAN: 1397 break; 1398 default: 1399 /* not reached */ 1400 WARN_ON(1); 1401 } 1402 1403 /* 1404 * Set default queue parameters so drivers don't 1405 * need to initialise the hardware if the hardware 1406 * doesn't start up with sane defaults. 1407 * Enable QoS for anything but station interfaces. 1408 */ 1409 ieee80211_set_wmm_default(&sdata->deflink, true, 1410 sdata->vif.type != NL80211_IFTYPE_STATION); 1411 } 1412 1413 switch (sdata->vif.type) { 1414 case NL80211_IFTYPE_P2P_DEVICE: 1415 rcu_assign_pointer(local->p2p_sdata, sdata); 1416 break; 1417 case NL80211_IFTYPE_MONITOR: 1418 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1419 break; 1420 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1421 break; 1422 default: 1423 break; 1424 } 1425 1426 /* 1427 * set_multicast_list will be invoked by the networking core 1428 * which will check whether any increments here were done in 1429 * error and sync them down to the hardware as filter flags. 1430 */ 1431 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1432 atomic_inc(&local->iff_allmultis); 1433 1434 if (coming_up) 1435 local->open_count++; 1436 1437 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 mutex_lock(&local->mtx); 1454 list_del(&sdata->u.vlan.list); 1455 mutex_unlock(&local->mtx); 1456 } 1457 /* might already be clear but that doesn't matter */ 1458 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1459 return res; 1460 } 1461 1462 static void ieee80211_if_free(struct net_device *dev) 1463 { 1464 free_percpu(dev->tstats); 1465 } 1466 1467 static void ieee80211_if_setup(struct net_device *dev) 1468 { 1469 ether_setup(dev); 1470 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1471 dev->priv_flags |= IFF_NO_QUEUE; 1472 dev->netdev_ops = &ieee80211_dataif_ops; 1473 dev->needs_free_netdev = true; 1474 dev->priv_destructor = ieee80211_if_free; 1475 } 1476 1477 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1478 struct ieee80211_sub_if_data *sdata, 1479 struct sk_buff *skb) 1480 { 1481 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1482 1483 if (ieee80211_is_action(mgmt->frame_control) && 1484 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1485 struct sta_info *sta; 1486 int len = skb->len; 1487 1488 mutex_lock(&local->sta_mtx); 1489 sta = sta_info_get_bss(sdata, mgmt->sa); 1490 if (sta) { 1491 switch (mgmt->u.action.u.addba_req.action_code) { 1492 case WLAN_ACTION_ADDBA_REQ: 1493 ieee80211_process_addba_request(local, sta, 1494 mgmt, len); 1495 break; 1496 case WLAN_ACTION_ADDBA_RESP: 1497 ieee80211_process_addba_resp(local, sta, 1498 mgmt, len); 1499 break; 1500 case WLAN_ACTION_DELBA: 1501 ieee80211_process_delba(sdata, sta, 1502 mgmt, len); 1503 break; 1504 default: 1505 WARN_ON(1); 1506 break; 1507 } 1508 } 1509 mutex_unlock(&local->sta_mtx); 1510 } else if (ieee80211_is_action(mgmt->frame_control) && 1511 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1512 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1513 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1514 struct ieee80211_rx_status *status; 1515 enum nl80211_band band; 1516 struct sta_info *sta; 1517 u8 opmode; 1518 1519 status = IEEE80211_SKB_RXCB(skb); 1520 band = status->band; 1521 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1522 1523 mutex_lock(&local->sta_mtx); 1524 sta = sta_info_get_bss(sdata, mgmt->sa); 1525 1526 if (sta) 1527 ieee80211_vht_handle_opmode(sdata, 1528 &sta->deflink, 1529 opmode, band); 1530 1531 mutex_unlock(&local->sta_mtx); 1532 break; 1533 } 1534 case WLAN_VHT_ACTION_GROUPID_MGMT: 1535 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1536 mgmt); 1537 break; 1538 default: 1539 WARN_ON(1); 1540 break; 1541 } 1542 } else if (ieee80211_is_action(mgmt->frame_control) && 1543 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1544 switch (mgmt->u.action.u.s1g.action_code) { 1545 case WLAN_S1G_TWT_TEARDOWN: 1546 case WLAN_S1G_TWT_SETUP: 1547 ieee80211_s1g_rx_twt_action(sdata, skb); 1548 break; 1549 default: 1550 break; 1551 } 1552 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1553 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1554 ieee80211_sta_rx_queued_ext(sdata, skb); 1555 else 1556 WARN_ON(1); 1557 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1558 struct ieee80211_hdr *hdr = (void *)mgmt; 1559 struct sta_info *sta; 1560 1561 /* 1562 * So the frame isn't mgmt, but frame_control 1563 * is at the right place anyway, of course, so 1564 * the if statement is correct. 1565 * 1566 * Warn if we have other data frame types here, 1567 * they must not get here. 1568 */ 1569 WARN_ON(hdr->frame_control & 1570 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1571 WARN_ON(!(hdr->seq_ctrl & 1572 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1573 /* 1574 * This was a fragment of a frame, received while 1575 * a block-ack session was active. That cannot be 1576 * right, so terminate the session. 1577 */ 1578 mutex_lock(&local->sta_mtx); 1579 sta = sta_info_get_bss(sdata, mgmt->sa); 1580 if (sta) { 1581 u16 tid = ieee80211_get_tid(hdr); 1582 1583 __ieee80211_stop_rx_ba_session( 1584 sta, tid, WLAN_BACK_RECIPIENT, 1585 WLAN_REASON_QSTA_REQUIRE_SETUP, 1586 true); 1587 } 1588 mutex_unlock(&local->sta_mtx); 1589 } else switch (sdata->vif.type) { 1590 case NL80211_IFTYPE_STATION: 1591 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1592 break; 1593 case NL80211_IFTYPE_ADHOC: 1594 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1595 break; 1596 case NL80211_IFTYPE_MESH_POINT: 1597 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1598 break; 1599 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1600 break; 1601 default: 1602 WARN(1, "frame for unexpected interface type"); 1603 break; 1604 } 1605 } 1606 1607 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1608 struct sk_buff *skb) 1609 { 1610 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1611 1612 if (ieee80211_is_action(mgmt->frame_control) && 1613 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1614 switch (mgmt->u.action.u.s1g.action_code) { 1615 case WLAN_S1G_TWT_TEARDOWN: 1616 case WLAN_S1G_TWT_SETUP: 1617 ieee80211_s1g_status_twt_action(sdata, skb); 1618 break; 1619 default: 1620 break; 1621 } 1622 } 1623 } 1624 1625 static void ieee80211_iface_work(struct work_struct *work) 1626 { 1627 struct ieee80211_sub_if_data *sdata = 1628 container_of(work, struct ieee80211_sub_if_data, work); 1629 struct ieee80211_local *local = sdata->local; 1630 struct sk_buff *skb; 1631 1632 if (!ieee80211_sdata_running(sdata)) 1633 return; 1634 1635 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1636 return; 1637 1638 if (!ieee80211_can_run_worker(local)) 1639 return; 1640 1641 /* first process frames */ 1642 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1643 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1644 1645 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1646 ieee80211_process_tdls_channel_switch(sdata, skb); 1647 else 1648 ieee80211_iface_process_skb(local, sdata, skb); 1649 1650 kfree_skb(skb); 1651 kcov_remote_stop(); 1652 } 1653 1654 /* process status queue */ 1655 while ((skb = skb_dequeue(&sdata->status_queue))) { 1656 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1657 1658 ieee80211_iface_process_status(sdata, skb); 1659 kfree_skb(skb); 1660 1661 kcov_remote_stop(); 1662 } 1663 1664 /* then other type-dependent work */ 1665 switch (sdata->vif.type) { 1666 case NL80211_IFTYPE_STATION: 1667 ieee80211_sta_work(sdata); 1668 break; 1669 case NL80211_IFTYPE_ADHOC: 1670 ieee80211_ibss_work(sdata); 1671 break; 1672 case NL80211_IFTYPE_MESH_POINT: 1673 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1674 break; 1675 ieee80211_mesh_work(sdata); 1676 break; 1677 case NL80211_IFTYPE_OCB: 1678 ieee80211_ocb_work(sdata); 1679 break; 1680 default: 1681 break; 1682 } 1683 } 1684 1685 static void ieee80211_recalc_smps_work(struct work_struct *work) 1686 { 1687 struct ieee80211_sub_if_data *sdata = 1688 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1689 1690 ieee80211_recalc_smps(sdata, &sdata->deflink); 1691 } 1692 1693 static void ieee80211_activate_links_work(struct work_struct *work) 1694 { 1695 struct ieee80211_sub_if_data *sdata = 1696 container_of(work, struct ieee80211_sub_if_data, 1697 activate_links_work); 1698 1699 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1700 } 1701 1702 /* 1703 * Helper function to initialise an interface to a specific type. 1704 */ 1705 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1706 enum nl80211_iftype type) 1707 { 1708 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1709 0xff, 0xff, 0xff}; 1710 1711 /* clear type-dependent unions */ 1712 memset(&sdata->u, 0, sizeof(sdata->u)); 1713 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1714 1715 /* and set some type-dependent values */ 1716 sdata->vif.type = type; 1717 sdata->vif.p2p = false; 1718 sdata->wdev.iftype = type; 1719 1720 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1721 sdata->control_port_no_encrypt = false; 1722 sdata->control_port_over_nl80211 = false; 1723 sdata->control_port_no_preauth = false; 1724 sdata->vif.cfg.idle = true; 1725 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1726 1727 sdata->noack_map = 0; 1728 1729 /* only monitor/p2p-device differ */ 1730 if (sdata->dev) { 1731 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1732 sdata->dev->type = ARPHRD_ETHER; 1733 } 1734 1735 skb_queue_head_init(&sdata->skb_queue); 1736 skb_queue_head_init(&sdata->status_queue); 1737 INIT_WORK(&sdata->work, ieee80211_iface_work); 1738 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1739 INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work); 1740 1741 switch (type) { 1742 case NL80211_IFTYPE_P2P_GO: 1743 type = NL80211_IFTYPE_AP; 1744 sdata->vif.type = type; 1745 sdata->vif.p2p = true; 1746 fallthrough; 1747 case NL80211_IFTYPE_AP: 1748 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1749 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1750 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1751 break; 1752 case NL80211_IFTYPE_P2P_CLIENT: 1753 type = NL80211_IFTYPE_STATION; 1754 sdata->vif.type = type; 1755 sdata->vif.p2p = true; 1756 fallthrough; 1757 case NL80211_IFTYPE_STATION: 1758 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1759 ieee80211_sta_setup_sdata(sdata); 1760 break; 1761 case NL80211_IFTYPE_OCB: 1762 sdata->vif.bss_conf.bssid = bssid_wildcard; 1763 ieee80211_ocb_setup_sdata(sdata); 1764 break; 1765 case NL80211_IFTYPE_ADHOC: 1766 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1767 ieee80211_ibss_setup_sdata(sdata); 1768 break; 1769 case NL80211_IFTYPE_MESH_POINT: 1770 if (ieee80211_vif_is_mesh(&sdata->vif)) 1771 ieee80211_mesh_init_sdata(sdata); 1772 break; 1773 case NL80211_IFTYPE_MONITOR: 1774 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1775 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1776 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1777 MONITOR_FLAG_OTHER_BSS; 1778 break; 1779 case NL80211_IFTYPE_NAN: 1780 idr_init(&sdata->u.nan.function_inst_ids); 1781 spin_lock_init(&sdata->u.nan.func_lock); 1782 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1783 break; 1784 case NL80211_IFTYPE_AP_VLAN: 1785 case NL80211_IFTYPE_P2P_DEVICE: 1786 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1787 break; 1788 case NL80211_IFTYPE_UNSPECIFIED: 1789 case NL80211_IFTYPE_WDS: 1790 case NUM_NL80211_IFTYPES: 1791 WARN_ON(1); 1792 break; 1793 } 1794 1795 /* need to do this after the switch so vif.type is correct */ 1796 ieee80211_link_setup(&sdata->deflink); 1797 1798 ieee80211_debugfs_add_netdev(sdata); 1799 } 1800 1801 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1802 enum nl80211_iftype type) 1803 { 1804 struct ieee80211_local *local = sdata->local; 1805 int ret, err; 1806 enum nl80211_iftype internal_type = type; 1807 bool p2p = false; 1808 1809 ASSERT_RTNL(); 1810 1811 if (!local->ops->change_interface) 1812 return -EBUSY; 1813 1814 /* for now, don't support changing while links exist */ 1815 if (sdata->vif.valid_links) 1816 return -EBUSY; 1817 1818 switch (sdata->vif.type) { 1819 case NL80211_IFTYPE_AP: 1820 if (!list_empty(&sdata->u.ap.vlans)) 1821 return -EBUSY; 1822 break; 1823 case NL80211_IFTYPE_STATION: 1824 case NL80211_IFTYPE_ADHOC: 1825 case NL80211_IFTYPE_OCB: 1826 /* 1827 * Could maybe also all others here? 1828 * Just not sure how that interacts 1829 * with the RX/config path e.g. for 1830 * mesh. 1831 */ 1832 break; 1833 default: 1834 return -EBUSY; 1835 } 1836 1837 switch (type) { 1838 case NL80211_IFTYPE_AP: 1839 case NL80211_IFTYPE_STATION: 1840 case NL80211_IFTYPE_ADHOC: 1841 case NL80211_IFTYPE_OCB: 1842 /* 1843 * Could probably support everything 1844 * but here. 1845 */ 1846 break; 1847 case NL80211_IFTYPE_P2P_CLIENT: 1848 p2p = true; 1849 internal_type = NL80211_IFTYPE_STATION; 1850 break; 1851 case NL80211_IFTYPE_P2P_GO: 1852 p2p = true; 1853 internal_type = NL80211_IFTYPE_AP; 1854 break; 1855 default: 1856 return -EBUSY; 1857 } 1858 1859 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1860 if (ret) 1861 return ret; 1862 1863 ieee80211_stop_vif_queues(local, sdata, 1864 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1865 /* do_stop will synchronize_rcu() first thing */ 1866 ieee80211_do_stop(sdata, false); 1867 1868 ieee80211_teardown_sdata(sdata); 1869 1870 ieee80211_set_sdata_offload_flags(sdata); 1871 ret = drv_change_interface(local, sdata, internal_type, p2p); 1872 if (ret) 1873 type = ieee80211_vif_type_p2p(&sdata->vif); 1874 1875 /* 1876 * Ignore return value here, there's not much we can do since 1877 * the driver changed the interface type internally already. 1878 * The warnings will hopefully make driver authors fix it :-) 1879 */ 1880 ieee80211_check_queues(sdata, type); 1881 1882 ieee80211_setup_sdata(sdata, type); 1883 ieee80211_set_vif_encap_ops(sdata); 1884 1885 err = ieee80211_do_open(&sdata->wdev, false); 1886 WARN(err, "type change: do_open returned %d", err); 1887 1888 ieee80211_wake_vif_queues(local, sdata, 1889 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1890 return ret; 1891 } 1892 1893 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1894 enum nl80211_iftype type) 1895 { 1896 int ret; 1897 1898 ASSERT_RTNL(); 1899 1900 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1901 return 0; 1902 1903 if (ieee80211_sdata_running(sdata)) { 1904 ret = ieee80211_runtime_change_iftype(sdata, type); 1905 if (ret) 1906 return ret; 1907 } else { 1908 /* Purge and reset type-dependent state. */ 1909 ieee80211_teardown_sdata(sdata); 1910 ieee80211_setup_sdata(sdata, type); 1911 } 1912 1913 /* reset some values that shouldn't be kept across type changes */ 1914 if (type == NL80211_IFTYPE_STATION) 1915 sdata->u.mgd.use_4addr = false; 1916 1917 return 0; 1918 } 1919 1920 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1921 u8 *perm_addr, enum nl80211_iftype type) 1922 { 1923 struct ieee80211_sub_if_data *sdata; 1924 u64 mask, start, addr, val, inc; 1925 u8 *m; 1926 u8 tmp_addr[ETH_ALEN]; 1927 int i; 1928 1929 /* default ... something at least */ 1930 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1931 1932 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1933 local->hw.wiphy->n_addresses <= 1) 1934 return; 1935 1936 mutex_lock(&local->iflist_mtx); 1937 1938 switch (type) { 1939 case NL80211_IFTYPE_MONITOR: 1940 /* doesn't matter */ 1941 break; 1942 case NL80211_IFTYPE_AP_VLAN: 1943 /* match up with an AP interface */ 1944 list_for_each_entry(sdata, &local->interfaces, list) { 1945 if (sdata->vif.type != NL80211_IFTYPE_AP) 1946 continue; 1947 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1948 break; 1949 } 1950 /* keep default if no AP interface present */ 1951 break; 1952 case NL80211_IFTYPE_P2P_CLIENT: 1953 case NL80211_IFTYPE_P2P_GO: 1954 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1955 list_for_each_entry(sdata, &local->interfaces, list) { 1956 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1957 continue; 1958 if (!ieee80211_sdata_running(sdata)) 1959 continue; 1960 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1961 goto out_unlock; 1962 } 1963 } 1964 fallthrough; 1965 default: 1966 /* assign a new address if possible -- try n_addresses first */ 1967 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1968 bool used = false; 1969 1970 list_for_each_entry(sdata, &local->interfaces, list) { 1971 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1972 sdata->vif.addr)) { 1973 used = true; 1974 break; 1975 } 1976 } 1977 1978 if (!used) { 1979 memcpy(perm_addr, 1980 local->hw.wiphy->addresses[i].addr, 1981 ETH_ALEN); 1982 break; 1983 } 1984 } 1985 1986 /* try mask if available */ 1987 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1988 break; 1989 1990 m = local->hw.wiphy->addr_mask; 1991 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1992 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1993 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1994 1995 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1996 /* not a contiguous mask ... not handled now! */ 1997 pr_info("not contiguous\n"); 1998 break; 1999 } 2000 2001 /* 2002 * Pick address of existing interface in case user changed 2003 * MAC address manually, default to perm_addr. 2004 */ 2005 m = local->hw.wiphy->perm_addr; 2006 list_for_each_entry(sdata, &local->interfaces, list) { 2007 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2008 continue; 2009 m = sdata->vif.addr; 2010 break; 2011 } 2012 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2013 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2014 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2015 2016 inc = 1ULL<<__ffs64(mask); 2017 val = (start & mask); 2018 addr = (start & ~mask) | (val & mask); 2019 do { 2020 bool used = false; 2021 2022 tmp_addr[5] = addr >> 0*8; 2023 tmp_addr[4] = addr >> 1*8; 2024 tmp_addr[3] = addr >> 2*8; 2025 tmp_addr[2] = addr >> 3*8; 2026 tmp_addr[1] = addr >> 4*8; 2027 tmp_addr[0] = addr >> 5*8; 2028 2029 val += inc; 2030 2031 list_for_each_entry(sdata, &local->interfaces, list) { 2032 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2033 used = true; 2034 break; 2035 } 2036 } 2037 2038 if (!used) { 2039 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2040 break; 2041 } 2042 addr = (start & ~mask) | (val & mask); 2043 } while (addr != start); 2044 2045 break; 2046 } 2047 2048 out_unlock: 2049 mutex_unlock(&local->iflist_mtx); 2050 } 2051 2052 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2053 unsigned char name_assign_type, 2054 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2055 struct vif_params *params) 2056 { 2057 struct net_device *ndev = NULL; 2058 struct ieee80211_sub_if_data *sdata = NULL; 2059 struct txq_info *txqi; 2060 int ret, i; 2061 2062 ASSERT_RTNL(); 2063 2064 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2065 struct wireless_dev *wdev; 2066 2067 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2068 GFP_KERNEL); 2069 if (!sdata) 2070 return -ENOMEM; 2071 wdev = &sdata->wdev; 2072 2073 sdata->dev = NULL; 2074 strscpy(sdata->name, name, IFNAMSIZ); 2075 ieee80211_assign_perm_addr(local, wdev->address, type); 2076 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2077 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2078 } else { 2079 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2080 sizeof(void *)); 2081 int txq_size = 0; 2082 2083 if (type != NL80211_IFTYPE_AP_VLAN && 2084 (type != NL80211_IFTYPE_MONITOR || 2085 (params->flags & MONITOR_FLAG_ACTIVE))) 2086 txq_size += sizeof(struct txq_info) + 2087 local->hw.txq_data_size; 2088 2089 ndev = alloc_netdev_mqs(size + txq_size, 2090 name, name_assign_type, 2091 ieee80211_if_setup, 1, 1); 2092 if (!ndev) 2093 return -ENOMEM; 2094 2095 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2096 2097 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2098 if (!ndev->tstats) { 2099 free_netdev(ndev); 2100 return -ENOMEM; 2101 } 2102 2103 ndev->needed_headroom = local->tx_headroom + 2104 4*6 /* four MAC addresses */ 2105 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2106 + 6 /* mesh */ 2107 + 8 /* rfc1042/bridge tunnel */ 2108 - ETH_HLEN /* ethernet hard_header_len */ 2109 + IEEE80211_ENCRYPT_HEADROOM; 2110 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2111 2112 ret = dev_alloc_name(ndev, ndev->name); 2113 if (ret < 0) { 2114 ieee80211_if_free(ndev); 2115 free_netdev(ndev); 2116 return ret; 2117 } 2118 2119 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2120 if (is_valid_ether_addr(params->macaddr)) 2121 eth_hw_addr_set(ndev, params->macaddr); 2122 else 2123 eth_hw_addr_set(ndev, ndev->perm_addr); 2124 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2125 2126 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2127 sdata = netdev_priv(ndev); 2128 ndev->ieee80211_ptr = &sdata->wdev; 2129 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2130 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2131 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2132 2133 if (txq_size) { 2134 txqi = netdev_priv(ndev) + size; 2135 ieee80211_txq_init(sdata, NULL, txqi, 0); 2136 } 2137 2138 sdata->dev = ndev; 2139 } 2140 2141 /* initialise type-independent data */ 2142 sdata->wdev.wiphy = local->hw.wiphy; 2143 2144 ieee80211_sdata_init(local, sdata); 2145 2146 ieee80211_init_frag_cache(&sdata->frags); 2147 2148 INIT_LIST_HEAD(&sdata->key_list); 2149 2150 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 2151 ieee80211_delayed_tailroom_dec); 2152 2153 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2154 struct ieee80211_supported_band *sband; 2155 sband = local->hw.wiphy->bands[i]; 2156 sdata->rc_rateidx_mask[i] = 2157 sband ? (1 << sband->n_bitrates) - 1 : 0; 2158 if (sband) { 2159 __le16 cap; 2160 u16 *vht_rate_mask; 2161 2162 memcpy(sdata->rc_rateidx_mcs_mask[i], 2163 sband->ht_cap.mcs.rx_mask, 2164 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2165 2166 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2167 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2168 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2169 } else { 2170 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2171 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2172 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2173 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2174 } 2175 } 2176 2177 ieee80211_set_default_queues(sdata); 2178 2179 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2180 sdata->deflink.user_power_level = local->user_power_level; 2181 2182 /* setup type-dependent data */ 2183 ieee80211_setup_sdata(sdata, type); 2184 2185 if (ndev) { 2186 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2187 if (type == NL80211_IFTYPE_STATION) 2188 sdata->u.mgd.use_4addr = params->use_4addr; 2189 2190 ndev->features |= local->hw.netdev_features; 2191 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2192 ndev->hw_features |= ndev->features & 2193 MAC80211_SUPPORTED_FEATURES_TX; 2194 sdata->vif.netdev_features = local->hw.netdev_features; 2195 2196 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2197 2198 /* MTU range is normally 256 - 2304, where the upper limit is 2199 * the maximum MSDU size. Monitor interfaces send and receive 2200 * MPDU and A-MSDU frames which may be much larger so we do 2201 * not impose an upper limit in that case. 2202 */ 2203 ndev->min_mtu = 256; 2204 if (type == NL80211_IFTYPE_MONITOR) 2205 ndev->max_mtu = 0; 2206 else 2207 ndev->max_mtu = local->hw.max_mtu; 2208 2209 ret = cfg80211_register_netdevice(ndev); 2210 if (ret) { 2211 free_netdev(ndev); 2212 return ret; 2213 } 2214 } 2215 2216 mutex_lock(&local->iflist_mtx); 2217 list_add_tail_rcu(&sdata->list, &local->interfaces); 2218 mutex_unlock(&local->iflist_mtx); 2219 2220 if (new_wdev) 2221 *new_wdev = &sdata->wdev; 2222 2223 return 0; 2224 } 2225 2226 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2227 { 2228 ASSERT_RTNL(); 2229 2230 mutex_lock(&sdata->local->iflist_mtx); 2231 list_del_rcu(&sdata->list); 2232 mutex_unlock(&sdata->local->iflist_mtx); 2233 2234 if (sdata->vif.txq) 2235 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2236 2237 synchronize_rcu(); 2238 2239 cfg80211_unregister_wdev(&sdata->wdev); 2240 2241 if (!sdata->dev) { 2242 ieee80211_teardown_sdata(sdata); 2243 kfree(sdata); 2244 } 2245 } 2246 2247 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2248 { 2249 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2250 return; 2251 ieee80211_do_stop(sdata, true); 2252 } 2253 2254 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2255 { 2256 struct ieee80211_sub_if_data *sdata, *tmp; 2257 LIST_HEAD(unreg_list); 2258 LIST_HEAD(wdev_list); 2259 2260 ASSERT_RTNL(); 2261 2262 /* Before destroying the interfaces, make sure they're all stopped so 2263 * that the hardware is stopped. Otherwise, the driver might still be 2264 * iterating the interfaces during the shutdown, e.g. from a worker 2265 * or from RX processing or similar, and if it does so (using atomic 2266 * iteration) while we're manipulating the list, the iteration will 2267 * crash. 2268 * 2269 * After this, the hardware should be stopped and the driver should 2270 * have stopped all of its activities, so that we can do RCU-unaware 2271 * manipulations of the interface list below. 2272 */ 2273 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2274 2275 WARN(local->open_count, "%s: open count remains %d\n", 2276 wiphy_name(local->hw.wiphy), local->open_count); 2277 2278 ieee80211_txq_teardown_flows(local); 2279 2280 mutex_lock(&local->iflist_mtx); 2281 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 2282 list_del(&sdata->list); 2283 2284 if (sdata->dev) 2285 unregister_netdevice_queue(sdata->dev, &unreg_list); 2286 else 2287 list_add(&sdata->list, &wdev_list); 2288 } 2289 mutex_unlock(&local->iflist_mtx); 2290 2291 unregister_netdevice_many(&unreg_list); 2292 2293 wiphy_lock(local->hw.wiphy); 2294 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 2295 list_del(&sdata->list); 2296 cfg80211_unregister_wdev(&sdata->wdev); 2297 kfree(sdata); 2298 } 2299 wiphy_unlock(local->hw.wiphy); 2300 } 2301 2302 static int netdev_notify(struct notifier_block *nb, 2303 unsigned long state, void *ptr) 2304 { 2305 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2306 struct ieee80211_sub_if_data *sdata; 2307 2308 if (state != NETDEV_CHANGENAME) 2309 return NOTIFY_DONE; 2310 2311 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2312 return NOTIFY_DONE; 2313 2314 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2315 return NOTIFY_DONE; 2316 2317 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2318 memcpy(sdata->name, dev->name, IFNAMSIZ); 2319 ieee80211_debugfs_rename_netdev(sdata); 2320 2321 return NOTIFY_OK; 2322 } 2323 2324 static struct notifier_block mac80211_netdev_notifier = { 2325 .notifier_call = netdev_notify, 2326 }; 2327 2328 int ieee80211_iface_init(void) 2329 { 2330 return register_netdevice_notifier(&mac80211_netdev_notifier); 2331 } 2332 2333 void ieee80211_iface_exit(void) 2334 { 2335 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2336 } 2337 2338 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2339 { 2340 if (sdata->vif.type == NL80211_IFTYPE_AP) 2341 atomic_inc(&sdata->u.ap.num_mcast_sta); 2342 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2343 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2344 } 2345 2346 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2347 { 2348 if (sdata->vif.type == NL80211_IFTYPE_AP) 2349 atomic_dec(&sdata->u.ap.num_mcast_sta); 2350 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2351 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2352 } 2353