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 return -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 nsdata->wdev.use_4addr) 368 return -EOPNOTSUPP; 369 370 /* 371 * can only add VLANs to enabled APs 372 */ 373 if (iftype == NL80211_IFTYPE_AP_VLAN && 374 nsdata->vif.type == NL80211_IFTYPE_AP) 375 sdata->bss = &nsdata->u.ap; 376 } 377 } 378 379 mutex_lock(&local->chanctx_mtx); 380 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 381 mutex_unlock(&local->chanctx_mtx); 382 return ret; 383 } 384 385 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 386 enum nl80211_iftype iftype) 387 { 388 int n_queues = sdata->local->hw.queues; 389 int i; 390 391 if (iftype == NL80211_IFTYPE_NAN) 392 return 0; 393 394 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 395 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 396 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 397 IEEE80211_INVAL_HW_QUEUE)) 398 return -EINVAL; 399 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 400 n_queues)) 401 return -EINVAL; 402 } 403 } 404 405 if ((iftype != NL80211_IFTYPE_AP && 406 iftype != NL80211_IFTYPE_P2P_GO && 407 iftype != NL80211_IFTYPE_MESH_POINT) || 408 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 409 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 410 return 0; 411 } 412 413 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 414 return -EINVAL; 415 416 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 417 return -EINVAL; 418 419 return 0; 420 } 421 422 static int ieee80211_open(struct net_device *dev) 423 { 424 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 425 int err; 426 427 /* fail early if user set an invalid address */ 428 if (!is_valid_ether_addr(dev->dev_addr)) 429 return -EADDRNOTAVAIL; 430 431 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 432 if (err) 433 return err; 434 435 wiphy_lock(sdata->local->hw.wiphy); 436 err = ieee80211_do_open(&sdata->wdev, true); 437 wiphy_unlock(sdata->local->hw.wiphy); 438 439 return err; 440 } 441 442 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 443 { 444 struct ieee80211_local *local = sdata->local; 445 unsigned long flags; 446 struct sk_buff *skb, *tmp; 447 u32 hw_reconf_flags = 0; 448 int i, flushed; 449 struct ps_data *ps; 450 struct cfg80211_chan_def chandef; 451 bool cancel_scan; 452 struct cfg80211_nan_func *func; 453 454 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 455 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 456 457 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 458 if (cancel_scan) 459 ieee80211_scan_cancel(local); 460 461 /* 462 * Stop TX on this interface first. 463 */ 464 if (sdata->dev) 465 netif_tx_stop_all_queues(sdata->dev); 466 467 ieee80211_roc_purge(local, sdata); 468 469 switch (sdata->vif.type) { 470 case NL80211_IFTYPE_STATION: 471 ieee80211_mgd_stop(sdata); 472 break; 473 case NL80211_IFTYPE_ADHOC: 474 ieee80211_ibss_stop(sdata); 475 break; 476 case NL80211_IFTYPE_MONITOR: 477 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 478 break; 479 list_del_rcu(&sdata->u.mntr.list); 480 break; 481 default: 482 break; 483 } 484 485 /* 486 * Remove all stations associated with this interface. 487 * 488 * This must be done before calling ops->remove_interface() 489 * because otherwise we can later invoke ops->sta_notify() 490 * whenever the STAs are removed, and that invalidates driver 491 * assumptions about always getting a vif pointer that is valid 492 * (because if we remove a STA after ops->remove_interface() 493 * the driver will have removed the vif info already!) 494 * 495 * For AP_VLANs stations may exist since there's nothing else that 496 * would have removed them, but in other modes there shouldn't 497 * be any stations. 498 */ 499 flushed = sta_info_flush(sdata); 500 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 501 502 /* don't count this interface for allmulti while it is down */ 503 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 504 atomic_dec(&local->iff_allmultis); 505 506 if (sdata->vif.type == NL80211_IFTYPE_AP) { 507 local->fif_pspoll--; 508 local->fif_probe_req--; 509 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 510 local->fif_probe_req--; 511 } 512 513 if (sdata->dev) { 514 netif_addr_lock_bh(sdata->dev); 515 spin_lock_bh(&local->filter_lock); 516 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 517 sdata->dev->addr_len); 518 spin_unlock_bh(&local->filter_lock); 519 netif_addr_unlock_bh(sdata->dev); 520 } 521 522 del_timer_sync(&local->dynamic_ps_timer); 523 cancel_work_sync(&local->dynamic_ps_enable_work); 524 525 cancel_work_sync(&sdata->recalc_smps); 526 527 sdata_lock(sdata); 528 WARN(sdata->vif.valid_links, 529 "destroying interface with valid links 0x%04x\n", 530 sdata->vif.valid_links); 531 532 mutex_lock(&local->mtx); 533 sdata->vif.bss_conf.csa_active = false; 534 if (sdata->vif.type == NL80211_IFTYPE_STATION) 535 sdata->deflink.u.mgd.csa_waiting_bcn = false; 536 if (sdata->deflink.csa_block_tx) { 537 ieee80211_wake_vif_queues(local, sdata, 538 IEEE80211_QUEUE_STOP_REASON_CSA); 539 sdata->deflink.csa_block_tx = false; 540 } 541 mutex_unlock(&local->mtx); 542 sdata_unlock(sdata); 543 544 cancel_work_sync(&sdata->deflink.csa_finalize_work); 545 cancel_work_sync(&sdata->deflink.color_change_finalize_work); 546 547 cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work); 548 549 if (sdata->wdev.cac_started) { 550 chandef = sdata->vif.bss_conf.chandef; 551 WARN_ON(local->suspended); 552 mutex_lock(&local->mtx); 553 ieee80211_link_release_channel(&sdata->deflink); 554 mutex_unlock(&local->mtx); 555 cfg80211_cac_event(sdata->dev, &chandef, 556 NL80211_RADAR_CAC_ABORTED, 557 GFP_KERNEL); 558 } 559 560 if (sdata->vif.type == NL80211_IFTYPE_AP) { 561 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 562 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 563 /* remove all packets in parent bc_buf pointing to this dev */ 564 ps = &sdata->bss->ps; 565 566 spin_lock_irqsave(&ps->bc_buf.lock, flags); 567 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 568 if (skb->dev == sdata->dev) { 569 __skb_unlink(skb, &ps->bc_buf); 570 local->total_ps_buffered--; 571 ieee80211_free_txskb(&local->hw, skb); 572 } 573 } 574 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 575 } 576 577 if (going_down) 578 local->open_count--; 579 580 switch (sdata->vif.type) { 581 case NL80211_IFTYPE_AP_VLAN: 582 mutex_lock(&local->mtx); 583 list_del(&sdata->u.vlan.list); 584 mutex_unlock(&local->mtx); 585 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 586 /* see comment in the default case below */ 587 ieee80211_free_keys(sdata, true); 588 /* no need to tell driver */ 589 break; 590 case NL80211_IFTYPE_MONITOR: 591 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 592 local->cooked_mntrs--; 593 break; 594 } 595 596 local->monitors--; 597 if (local->monitors == 0) { 598 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 599 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 600 } 601 602 ieee80211_adjust_monitor_flags(sdata, -1); 603 break; 604 case NL80211_IFTYPE_NAN: 605 /* clean all the functions */ 606 spin_lock_bh(&sdata->u.nan.func_lock); 607 608 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 609 idr_remove(&sdata->u.nan.function_inst_ids, i); 610 cfg80211_free_nan_func(func); 611 } 612 idr_destroy(&sdata->u.nan.function_inst_ids); 613 614 spin_unlock_bh(&sdata->u.nan.func_lock); 615 break; 616 case NL80211_IFTYPE_P2P_DEVICE: 617 /* relies on synchronize_rcu() below */ 618 RCU_INIT_POINTER(local->p2p_sdata, NULL); 619 fallthrough; 620 default: 621 cancel_work_sync(&sdata->work); 622 /* 623 * When we get here, the interface is marked down. 624 * Free the remaining keys, if there are any 625 * (which can happen in AP mode if userspace sets 626 * keys before the interface is operating) 627 * 628 * Force the key freeing to always synchronize_net() 629 * to wait for the RX path in case it is using this 630 * interface enqueuing frames at this very time on 631 * another CPU. 632 */ 633 ieee80211_free_keys(sdata, true); 634 skb_queue_purge(&sdata->skb_queue); 635 skb_queue_purge(&sdata->status_queue); 636 } 637 638 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 639 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 640 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 641 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 642 if (info->control.vif == &sdata->vif) { 643 __skb_unlink(skb, &local->pending[i]); 644 ieee80211_free_txskb(&local->hw, skb); 645 } 646 } 647 } 648 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 649 650 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 651 ieee80211_txq_remove_vlan(local, sdata); 652 653 sdata->bss = NULL; 654 655 if (local->open_count == 0) 656 ieee80211_clear_tx_pending(local); 657 658 sdata->vif.bss_conf.beacon_int = 0; 659 660 /* 661 * If the interface goes down while suspended, presumably because 662 * the device was unplugged and that happens before our resume, 663 * then the driver is already unconfigured and the remainder of 664 * this function isn't needed. 665 * XXX: what about WoWLAN? If the device has software state, e.g. 666 * memory allocated, it might expect teardown commands from 667 * mac80211 here? 668 */ 669 if (local->suspended) { 670 WARN_ON(local->wowlan); 671 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 672 return; 673 } 674 675 switch (sdata->vif.type) { 676 case NL80211_IFTYPE_AP_VLAN: 677 break; 678 case NL80211_IFTYPE_MONITOR: 679 if (local->monitors == 0) 680 ieee80211_del_virtual_monitor(local); 681 682 mutex_lock(&local->mtx); 683 ieee80211_recalc_idle(local); 684 mutex_unlock(&local->mtx); 685 686 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 687 break; 688 689 fallthrough; 690 default: 691 if (going_down) 692 drv_remove_interface(local, sdata); 693 } 694 695 ieee80211_recalc_ps(local); 696 697 if (cancel_scan) 698 flush_delayed_work(&local->scan_work); 699 700 if (local->open_count == 0) { 701 ieee80211_stop_device(local); 702 703 /* no reconfiguring after stop! */ 704 return; 705 } 706 707 /* do after stop to avoid reconfiguring when we stop anyway */ 708 ieee80211_configure_filter(local); 709 ieee80211_hw_config(local, hw_reconf_flags); 710 711 if (local->monitors == local->open_count) 712 ieee80211_add_virtual_monitor(local); 713 } 714 715 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 716 { 717 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 718 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 719 720 if (!tx_vif) 721 return; 722 723 tx_sdata = vif_to_sdata(tx_vif); 724 sdata->vif.mbssid_tx_vif = NULL; 725 726 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 727 &tx_sdata->local->interfaces, list) { 728 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 729 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 730 ieee80211_sdata_running(non_tx_sdata)) { 731 non_tx_sdata->vif.mbssid_tx_vif = NULL; 732 dev_close(non_tx_sdata->wdev.netdev); 733 } 734 } 735 736 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 737 tx_sdata->vif.mbssid_tx_vif = NULL; 738 dev_close(tx_sdata->wdev.netdev); 739 } 740 } 741 742 static int ieee80211_stop(struct net_device *dev) 743 { 744 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 745 746 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 747 if (sdata->vif.type == NL80211_IFTYPE_AP) { 748 struct ieee80211_sub_if_data *vlan, *tmpsdata; 749 750 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 751 u.vlan.list) 752 dev_close(vlan->dev); 753 754 ieee80211_stop_mbssid(sdata); 755 } 756 757 wiphy_lock(sdata->local->hw.wiphy); 758 ieee80211_do_stop(sdata, true); 759 wiphy_unlock(sdata->local->hw.wiphy); 760 761 return 0; 762 } 763 764 static void ieee80211_set_multicast_list(struct net_device *dev) 765 { 766 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 767 struct ieee80211_local *local = sdata->local; 768 int allmulti, sdata_allmulti; 769 770 allmulti = !!(dev->flags & IFF_ALLMULTI); 771 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 772 773 if (allmulti != sdata_allmulti) { 774 if (dev->flags & IFF_ALLMULTI) 775 atomic_inc(&local->iff_allmultis); 776 else 777 atomic_dec(&local->iff_allmultis); 778 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 779 } 780 781 spin_lock_bh(&local->filter_lock); 782 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 783 spin_unlock_bh(&local->filter_lock); 784 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 785 } 786 787 /* 788 * Called when the netdev is removed or, by the code below, before 789 * the interface type changes. 790 */ 791 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 792 { 793 /* free extra data */ 794 ieee80211_free_keys(sdata, false); 795 796 ieee80211_debugfs_remove_netdev(sdata); 797 798 ieee80211_destroy_frag_cache(&sdata->frags); 799 800 if (ieee80211_vif_is_mesh(&sdata->vif)) 801 ieee80211_mesh_teardown_sdata(sdata); 802 803 ieee80211_vif_clear_links(sdata); 804 ieee80211_link_stop(&sdata->deflink); 805 } 806 807 static void ieee80211_uninit(struct net_device *dev) 808 { 809 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 810 } 811 812 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 813 struct sk_buff *skb, 814 struct net_device *sb_dev) 815 { 816 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 817 } 818 819 static void 820 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 821 { 822 dev_fetch_sw_netstats(stats, dev->tstats); 823 } 824 825 static 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_select_queue = ieee80211_netdev_select_queue, 833 .ndo_get_stats64 = ieee80211_get_stats64, 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_select_queue = ieee80211_netdev_select_queue, 941 .ndo_get_stats64 = ieee80211_get_stats64, 942 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 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 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1414 1415 switch (sdata->vif.type) { 1416 case NL80211_IFTYPE_P2P_DEVICE: 1417 rcu_assign_pointer(local->p2p_sdata, sdata); 1418 break; 1419 case NL80211_IFTYPE_MONITOR: 1420 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1421 break; 1422 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1423 break; 1424 default: 1425 break; 1426 } 1427 1428 /* 1429 * set_multicast_list will be invoked by the networking core 1430 * which will check whether any increments here were done in 1431 * error and sync them down to the hardware as filter flags. 1432 */ 1433 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1434 atomic_inc(&local->iff_allmultis); 1435 1436 if (coming_up) 1437 local->open_count++; 1438 1439 if (hw_reconf_flags) 1440 ieee80211_hw_config(local, hw_reconf_flags); 1441 1442 ieee80211_recalc_ps(local); 1443 1444 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 1445 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1446 local->ops->wake_tx_queue) { 1447 /* XXX: for AP_VLAN, actually track AP queues */ 1448 if (dev) 1449 netif_tx_start_all_queues(dev); 1450 } else if (dev) { 1451 unsigned long flags; 1452 int n_acs = IEEE80211_NUM_ACS; 1453 int ac; 1454 1455 if (local->hw.queues < IEEE80211_NUM_ACS) 1456 n_acs = 1; 1457 1458 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1459 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 1460 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 1461 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 1462 for (ac = 0; ac < n_acs; ac++) { 1463 int ac_queue = sdata->vif.hw_queue[ac]; 1464 1465 if (local->queue_stop_reasons[ac_queue] == 0 && 1466 skb_queue_empty(&local->pending[ac_queue])) 1467 netif_start_subqueue(dev, ac); 1468 } 1469 } 1470 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1471 } 1472 1473 return 0; 1474 err_del_interface: 1475 drv_remove_interface(local, sdata); 1476 err_stop: 1477 if (!local->open_count) 1478 drv_stop(local); 1479 err_del_bss: 1480 sdata->bss = NULL; 1481 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1482 mutex_lock(&local->mtx); 1483 list_del(&sdata->u.vlan.list); 1484 mutex_unlock(&local->mtx); 1485 } 1486 /* might already be clear but that doesn't matter */ 1487 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1488 return res; 1489 } 1490 1491 static void ieee80211_if_free(struct net_device *dev) 1492 { 1493 free_percpu(dev->tstats); 1494 } 1495 1496 static void ieee80211_if_setup(struct net_device *dev) 1497 { 1498 ether_setup(dev); 1499 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1500 dev->netdev_ops = &ieee80211_dataif_ops; 1501 dev->needs_free_netdev = true; 1502 dev->priv_destructor = ieee80211_if_free; 1503 } 1504 1505 static void ieee80211_if_setup_no_queue(struct net_device *dev) 1506 { 1507 ieee80211_if_setup(dev); 1508 dev->priv_flags |= IFF_NO_QUEUE; 1509 } 1510 1511 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1512 struct ieee80211_sub_if_data *sdata, 1513 struct sk_buff *skb) 1514 { 1515 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1516 1517 if (ieee80211_is_action(mgmt->frame_control) && 1518 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1519 struct sta_info *sta; 1520 int len = skb->len; 1521 1522 mutex_lock(&local->sta_mtx); 1523 sta = sta_info_get_bss(sdata, mgmt->sa); 1524 if (sta) { 1525 switch (mgmt->u.action.u.addba_req.action_code) { 1526 case WLAN_ACTION_ADDBA_REQ: 1527 ieee80211_process_addba_request(local, sta, 1528 mgmt, len); 1529 break; 1530 case WLAN_ACTION_ADDBA_RESP: 1531 ieee80211_process_addba_resp(local, sta, 1532 mgmt, len); 1533 break; 1534 case WLAN_ACTION_DELBA: 1535 ieee80211_process_delba(sdata, sta, 1536 mgmt, len); 1537 break; 1538 default: 1539 WARN_ON(1); 1540 break; 1541 } 1542 } 1543 mutex_unlock(&local->sta_mtx); 1544 } else if (ieee80211_is_action(mgmt->frame_control) && 1545 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1546 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1547 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1548 struct ieee80211_rx_status *status; 1549 enum nl80211_band band; 1550 struct sta_info *sta; 1551 u8 opmode; 1552 1553 status = IEEE80211_SKB_RXCB(skb); 1554 band = status->band; 1555 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1556 1557 mutex_lock(&local->sta_mtx); 1558 sta = sta_info_get_bss(sdata, mgmt->sa); 1559 1560 if (sta) 1561 ieee80211_vht_handle_opmode(sdata, 1562 &sta->deflink, 1563 opmode, band); 1564 1565 mutex_unlock(&local->sta_mtx); 1566 break; 1567 } 1568 case WLAN_VHT_ACTION_GROUPID_MGMT: 1569 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1570 mgmt); 1571 break; 1572 default: 1573 WARN_ON(1); 1574 break; 1575 } 1576 } else if (ieee80211_is_action(mgmt->frame_control) && 1577 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1578 switch (mgmt->u.action.u.s1g.action_code) { 1579 case WLAN_S1G_TWT_TEARDOWN: 1580 case WLAN_S1G_TWT_SETUP: 1581 ieee80211_s1g_rx_twt_action(sdata, skb); 1582 break; 1583 default: 1584 break; 1585 } 1586 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1587 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1588 ieee80211_sta_rx_queued_ext(sdata, skb); 1589 else 1590 WARN_ON(1); 1591 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1592 struct ieee80211_hdr *hdr = (void *)mgmt; 1593 struct sta_info *sta; 1594 1595 /* 1596 * So the frame isn't mgmt, but frame_control 1597 * is at the right place anyway, of course, so 1598 * the if statement is correct. 1599 * 1600 * Warn if we have other data frame types here, 1601 * they must not get here. 1602 */ 1603 WARN_ON(hdr->frame_control & 1604 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1605 WARN_ON(!(hdr->seq_ctrl & 1606 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1607 /* 1608 * This was a fragment of a frame, received while 1609 * a block-ack session was active. That cannot be 1610 * right, so terminate the session. 1611 */ 1612 mutex_lock(&local->sta_mtx); 1613 sta = sta_info_get_bss(sdata, mgmt->sa); 1614 if (sta) { 1615 u16 tid = ieee80211_get_tid(hdr); 1616 1617 __ieee80211_stop_rx_ba_session( 1618 sta, tid, WLAN_BACK_RECIPIENT, 1619 WLAN_REASON_QSTA_REQUIRE_SETUP, 1620 true); 1621 } 1622 mutex_unlock(&local->sta_mtx); 1623 } else switch (sdata->vif.type) { 1624 case NL80211_IFTYPE_STATION: 1625 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1626 break; 1627 case NL80211_IFTYPE_ADHOC: 1628 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1629 break; 1630 case NL80211_IFTYPE_MESH_POINT: 1631 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1632 break; 1633 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1634 break; 1635 default: 1636 WARN(1, "frame for unexpected interface type"); 1637 break; 1638 } 1639 } 1640 1641 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1642 struct sk_buff *skb) 1643 { 1644 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1645 1646 if (ieee80211_is_action(mgmt->frame_control) && 1647 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1648 switch (mgmt->u.action.u.s1g.action_code) { 1649 case WLAN_S1G_TWT_TEARDOWN: 1650 case WLAN_S1G_TWT_SETUP: 1651 ieee80211_s1g_status_twt_action(sdata, skb); 1652 break; 1653 default: 1654 break; 1655 } 1656 } 1657 } 1658 1659 static void ieee80211_iface_work(struct work_struct *work) 1660 { 1661 struct ieee80211_sub_if_data *sdata = 1662 container_of(work, struct ieee80211_sub_if_data, work); 1663 struct ieee80211_local *local = sdata->local; 1664 struct sk_buff *skb; 1665 1666 if (!ieee80211_sdata_running(sdata)) 1667 return; 1668 1669 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1670 return; 1671 1672 if (!ieee80211_can_run_worker(local)) 1673 return; 1674 1675 /* first process frames */ 1676 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1677 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1678 1679 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1680 ieee80211_process_tdls_channel_switch(sdata, skb); 1681 else 1682 ieee80211_iface_process_skb(local, sdata, skb); 1683 1684 kfree_skb(skb); 1685 kcov_remote_stop(); 1686 } 1687 1688 /* process status queue */ 1689 while ((skb = skb_dequeue(&sdata->status_queue))) { 1690 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1691 1692 ieee80211_iface_process_status(sdata, skb); 1693 kfree_skb(skb); 1694 1695 kcov_remote_stop(); 1696 } 1697 1698 /* then other type-dependent work */ 1699 switch (sdata->vif.type) { 1700 case NL80211_IFTYPE_STATION: 1701 ieee80211_sta_work(sdata); 1702 break; 1703 case NL80211_IFTYPE_ADHOC: 1704 ieee80211_ibss_work(sdata); 1705 break; 1706 case NL80211_IFTYPE_MESH_POINT: 1707 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1708 break; 1709 ieee80211_mesh_work(sdata); 1710 break; 1711 case NL80211_IFTYPE_OCB: 1712 ieee80211_ocb_work(sdata); 1713 break; 1714 default: 1715 break; 1716 } 1717 } 1718 1719 static void ieee80211_recalc_smps_work(struct work_struct *work) 1720 { 1721 struct ieee80211_sub_if_data *sdata = 1722 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1723 1724 ieee80211_recalc_smps(sdata, &sdata->deflink); 1725 } 1726 1727 /* 1728 * Helper function to initialise an interface to a specific type. 1729 */ 1730 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1731 enum nl80211_iftype type) 1732 { 1733 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1734 0xff, 0xff, 0xff}; 1735 1736 /* clear type-dependent unions */ 1737 memset(&sdata->u, 0, sizeof(sdata->u)); 1738 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1739 1740 /* and set some type-dependent values */ 1741 sdata->vif.type = type; 1742 sdata->vif.p2p = false; 1743 sdata->wdev.iftype = type; 1744 1745 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1746 sdata->control_port_no_encrypt = false; 1747 sdata->control_port_over_nl80211 = false; 1748 sdata->control_port_no_preauth = false; 1749 sdata->vif.cfg.idle = true; 1750 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1751 1752 sdata->noack_map = 0; 1753 1754 /* only monitor/p2p-device differ */ 1755 if (sdata->dev) { 1756 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1757 sdata->dev->type = ARPHRD_ETHER; 1758 } 1759 1760 skb_queue_head_init(&sdata->skb_queue); 1761 skb_queue_head_init(&sdata->status_queue); 1762 INIT_WORK(&sdata->work, ieee80211_iface_work); 1763 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1764 1765 switch (type) { 1766 case NL80211_IFTYPE_P2P_GO: 1767 type = NL80211_IFTYPE_AP; 1768 sdata->vif.type = type; 1769 sdata->vif.p2p = true; 1770 fallthrough; 1771 case NL80211_IFTYPE_AP: 1772 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1773 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1774 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1775 break; 1776 case NL80211_IFTYPE_P2P_CLIENT: 1777 type = NL80211_IFTYPE_STATION; 1778 sdata->vif.type = type; 1779 sdata->vif.p2p = true; 1780 fallthrough; 1781 case NL80211_IFTYPE_STATION: 1782 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1783 ieee80211_sta_setup_sdata(sdata); 1784 break; 1785 case NL80211_IFTYPE_OCB: 1786 sdata->vif.bss_conf.bssid = bssid_wildcard; 1787 ieee80211_ocb_setup_sdata(sdata); 1788 break; 1789 case NL80211_IFTYPE_ADHOC: 1790 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1791 ieee80211_ibss_setup_sdata(sdata); 1792 break; 1793 case NL80211_IFTYPE_MESH_POINT: 1794 if (ieee80211_vif_is_mesh(&sdata->vif)) 1795 ieee80211_mesh_init_sdata(sdata); 1796 break; 1797 case NL80211_IFTYPE_MONITOR: 1798 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1799 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1800 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1801 MONITOR_FLAG_OTHER_BSS; 1802 break; 1803 case NL80211_IFTYPE_NAN: 1804 idr_init(&sdata->u.nan.function_inst_ids); 1805 spin_lock_init(&sdata->u.nan.func_lock); 1806 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1807 break; 1808 case NL80211_IFTYPE_AP_VLAN: 1809 case NL80211_IFTYPE_P2P_DEVICE: 1810 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1811 break; 1812 case NL80211_IFTYPE_UNSPECIFIED: 1813 case NL80211_IFTYPE_WDS: 1814 case NUM_NL80211_IFTYPES: 1815 WARN_ON(1); 1816 break; 1817 } 1818 1819 /* need to do this after the switch so vif.type is correct */ 1820 ieee80211_link_setup(&sdata->deflink); 1821 1822 ieee80211_debugfs_add_netdev(sdata); 1823 } 1824 1825 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1826 enum nl80211_iftype type) 1827 { 1828 struct ieee80211_local *local = sdata->local; 1829 int ret, err; 1830 enum nl80211_iftype internal_type = type; 1831 bool p2p = false; 1832 1833 ASSERT_RTNL(); 1834 1835 if (!local->ops->change_interface) 1836 return -EBUSY; 1837 1838 /* for now, don't support changing while links exist */ 1839 if (sdata->vif.valid_links) 1840 return -EBUSY; 1841 1842 switch (sdata->vif.type) { 1843 case NL80211_IFTYPE_AP: 1844 if (!list_empty(&sdata->u.ap.vlans)) 1845 return -EBUSY; 1846 break; 1847 case NL80211_IFTYPE_STATION: 1848 case NL80211_IFTYPE_ADHOC: 1849 case NL80211_IFTYPE_OCB: 1850 /* 1851 * Could maybe also all others here? 1852 * Just not sure how that interacts 1853 * with the RX/config path e.g. for 1854 * mesh. 1855 */ 1856 break; 1857 default: 1858 return -EBUSY; 1859 } 1860 1861 switch (type) { 1862 case NL80211_IFTYPE_AP: 1863 case NL80211_IFTYPE_STATION: 1864 case NL80211_IFTYPE_ADHOC: 1865 case NL80211_IFTYPE_OCB: 1866 /* 1867 * Could probably support everything 1868 * but here. 1869 */ 1870 break; 1871 case NL80211_IFTYPE_P2P_CLIENT: 1872 p2p = true; 1873 internal_type = NL80211_IFTYPE_STATION; 1874 break; 1875 case NL80211_IFTYPE_P2P_GO: 1876 p2p = true; 1877 internal_type = NL80211_IFTYPE_AP; 1878 break; 1879 default: 1880 return -EBUSY; 1881 } 1882 1883 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1884 if (ret) 1885 return ret; 1886 1887 ieee80211_stop_vif_queues(local, sdata, 1888 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1889 synchronize_net(); 1890 1891 ieee80211_do_stop(sdata, false); 1892 1893 ieee80211_teardown_sdata(sdata); 1894 1895 ieee80211_set_sdata_offload_flags(sdata); 1896 ret = drv_change_interface(local, sdata, internal_type, p2p); 1897 if (ret) 1898 type = ieee80211_vif_type_p2p(&sdata->vif); 1899 1900 /* 1901 * Ignore return value here, there's not much we can do since 1902 * the driver changed the interface type internally already. 1903 * The warnings will hopefully make driver authors fix it :-) 1904 */ 1905 ieee80211_check_queues(sdata, type); 1906 1907 ieee80211_setup_sdata(sdata, type); 1908 ieee80211_set_vif_encap_ops(sdata); 1909 1910 err = ieee80211_do_open(&sdata->wdev, false); 1911 WARN(err, "type change: do_open returned %d", err); 1912 1913 ieee80211_wake_vif_queues(local, sdata, 1914 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1915 return ret; 1916 } 1917 1918 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1919 enum nl80211_iftype type) 1920 { 1921 int ret; 1922 1923 ASSERT_RTNL(); 1924 1925 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1926 return 0; 1927 1928 if (ieee80211_sdata_running(sdata)) { 1929 ret = ieee80211_runtime_change_iftype(sdata, type); 1930 if (ret) 1931 return ret; 1932 } else { 1933 /* Purge and reset type-dependent state. */ 1934 ieee80211_teardown_sdata(sdata); 1935 ieee80211_setup_sdata(sdata, type); 1936 } 1937 1938 /* reset some values that shouldn't be kept across type changes */ 1939 if (type == NL80211_IFTYPE_STATION) 1940 sdata->u.mgd.use_4addr = false; 1941 1942 return 0; 1943 } 1944 1945 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1946 u8 *perm_addr, enum nl80211_iftype type) 1947 { 1948 struct ieee80211_sub_if_data *sdata; 1949 u64 mask, start, addr, val, inc; 1950 u8 *m; 1951 u8 tmp_addr[ETH_ALEN]; 1952 int i; 1953 1954 /* default ... something at least */ 1955 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1956 1957 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1958 local->hw.wiphy->n_addresses <= 1) 1959 return; 1960 1961 mutex_lock(&local->iflist_mtx); 1962 1963 switch (type) { 1964 case NL80211_IFTYPE_MONITOR: 1965 /* doesn't matter */ 1966 break; 1967 case NL80211_IFTYPE_AP_VLAN: 1968 /* match up with an AP interface */ 1969 list_for_each_entry(sdata, &local->interfaces, list) { 1970 if (sdata->vif.type != NL80211_IFTYPE_AP) 1971 continue; 1972 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1973 break; 1974 } 1975 /* keep default if no AP interface present */ 1976 break; 1977 case NL80211_IFTYPE_P2P_CLIENT: 1978 case NL80211_IFTYPE_P2P_GO: 1979 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1980 list_for_each_entry(sdata, &local->interfaces, list) { 1981 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1982 continue; 1983 if (!ieee80211_sdata_running(sdata)) 1984 continue; 1985 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1986 goto out_unlock; 1987 } 1988 } 1989 fallthrough; 1990 default: 1991 /* assign a new address if possible -- try n_addresses first */ 1992 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1993 bool used = false; 1994 1995 list_for_each_entry(sdata, &local->interfaces, list) { 1996 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1997 sdata->vif.addr)) { 1998 used = true; 1999 break; 2000 } 2001 } 2002 2003 if (!used) { 2004 memcpy(perm_addr, 2005 local->hw.wiphy->addresses[i].addr, 2006 ETH_ALEN); 2007 break; 2008 } 2009 } 2010 2011 /* try mask if available */ 2012 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 2013 break; 2014 2015 m = local->hw.wiphy->addr_mask; 2016 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2017 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2018 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2019 2020 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2021 /* not a contiguous mask ... not handled now! */ 2022 pr_info("not contiguous\n"); 2023 break; 2024 } 2025 2026 /* 2027 * Pick address of existing interface in case user changed 2028 * MAC address manually, default to perm_addr. 2029 */ 2030 m = local->hw.wiphy->perm_addr; 2031 list_for_each_entry(sdata, &local->interfaces, list) { 2032 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2033 continue; 2034 m = sdata->vif.addr; 2035 break; 2036 } 2037 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2038 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2039 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2040 2041 inc = 1ULL<<__ffs64(mask); 2042 val = (start & mask); 2043 addr = (start & ~mask) | (val & mask); 2044 do { 2045 bool used = false; 2046 2047 tmp_addr[5] = addr >> 0*8; 2048 tmp_addr[4] = addr >> 1*8; 2049 tmp_addr[3] = addr >> 2*8; 2050 tmp_addr[2] = addr >> 3*8; 2051 tmp_addr[1] = addr >> 4*8; 2052 tmp_addr[0] = addr >> 5*8; 2053 2054 val += inc; 2055 2056 list_for_each_entry(sdata, &local->interfaces, list) { 2057 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2058 used = true; 2059 break; 2060 } 2061 } 2062 2063 if (!used) { 2064 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2065 break; 2066 } 2067 addr = (start & ~mask) | (val & mask); 2068 } while (addr != start); 2069 2070 break; 2071 } 2072 2073 out_unlock: 2074 mutex_unlock(&local->iflist_mtx); 2075 } 2076 2077 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2078 unsigned char name_assign_type, 2079 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2080 struct vif_params *params) 2081 { 2082 struct net_device *ndev = NULL; 2083 struct ieee80211_sub_if_data *sdata = NULL; 2084 struct txq_info *txqi; 2085 void (*if_setup)(struct net_device *dev); 2086 int ret, i; 2087 int txqs = 1; 2088 2089 ASSERT_RTNL(); 2090 2091 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2092 struct wireless_dev *wdev; 2093 2094 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2095 GFP_KERNEL); 2096 if (!sdata) 2097 return -ENOMEM; 2098 wdev = &sdata->wdev; 2099 2100 sdata->dev = NULL; 2101 strscpy(sdata->name, name, IFNAMSIZ); 2102 ieee80211_assign_perm_addr(local, wdev->address, type); 2103 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2104 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2105 } else { 2106 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2107 sizeof(void *)); 2108 int txq_size = 0; 2109 2110 if (local->ops->wake_tx_queue && 2111 type != NL80211_IFTYPE_AP_VLAN && 2112 (type != NL80211_IFTYPE_MONITOR || 2113 (params->flags & MONITOR_FLAG_ACTIVE))) 2114 txq_size += sizeof(struct txq_info) + 2115 local->hw.txq_data_size; 2116 2117 if (local->ops->wake_tx_queue) { 2118 if_setup = ieee80211_if_setup_no_queue; 2119 } else { 2120 if_setup = ieee80211_if_setup; 2121 if (local->hw.queues >= IEEE80211_NUM_ACS) 2122 txqs = IEEE80211_NUM_ACS; 2123 } 2124 2125 ndev = alloc_netdev_mqs(size + txq_size, 2126 name, name_assign_type, 2127 if_setup, txqs, 1); 2128 if (!ndev) 2129 return -ENOMEM; 2130 2131 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len) 2132 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len; 2133 2134 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2135 2136 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2137 if (!ndev->tstats) { 2138 free_netdev(ndev); 2139 return -ENOMEM; 2140 } 2141 2142 ndev->needed_headroom = local->tx_headroom + 2143 4*6 /* four MAC addresses */ 2144 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2145 + 6 /* mesh */ 2146 + 8 /* rfc1042/bridge tunnel */ 2147 - ETH_HLEN /* ethernet hard_header_len */ 2148 + IEEE80211_ENCRYPT_HEADROOM; 2149 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2150 2151 ret = dev_alloc_name(ndev, ndev->name); 2152 if (ret < 0) { 2153 ieee80211_if_free(ndev); 2154 free_netdev(ndev); 2155 return ret; 2156 } 2157 2158 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2159 if (is_valid_ether_addr(params->macaddr)) 2160 eth_hw_addr_set(ndev, params->macaddr); 2161 else 2162 eth_hw_addr_set(ndev, ndev->perm_addr); 2163 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2164 2165 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2166 sdata = netdev_priv(ndev); 2167 ndev->ieee80211_ptr = &sdata->wdev; 2168 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2169 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2170 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2171 2172 if (txq_size) { 2173 txqi = netdev_priv(ndev) + size; 2174 ieee80211_txq_init(sdata, NULL, txqi, 0); 2175 } 2176 2177 sdata->dev = ndev; 2178 } 2179 2180 /* initialise type-independent data */ 2181 sdata->wdev.wiphy = local->hw.wiphy; 2182 2183 ieee80211_sdata_init(local, sdata); 2184 2185 ieee80211_init_frag_cache(&sdata->frags); 2186 2187 INIT_LIST_HEAD(&sdata->key_list); 2188 2189 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 2190 ieee80211_delayed_tailroom_dec); 2191 2192 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2193 struct ieee80211_supported_band *sband; 2194 sband = local->hw.wiphy->bands[i]; 2195 sdata->rc_rateidx_mask[i] = 2196 sband ? (1 << sband->n_bitrates) - 1 : 0; 2197 if (sband) { 2198 __le16 cap; 2199 u16 *vht_rate_mask; 2200 2201 memcpy(sdata->rc_rateidx_mcs_mask[i], 2202 sband->ht_cap.mcs.rx_mask, 2203 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2204 2205 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2206 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2207 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2208 } else { 2209 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2210 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2211 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2212 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2213 } 2214 } 2215 2216 ieee80211_set_default_queues(sdata); 2217 2218 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2219 sdata->deflink.user_power_level = local->user_power_level; 2220 2221 /* setup type-dependent data */ 2222 ieee80211_setup_sdata(sdata, type); 2223 2224 if (ndev) { 2225 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2226 if (type == NL80211_IFTYPE_STATION) 2227 sdata->u.mgd.use_4addr = params->use_4addr; 2228 2229 ndev->features |= local->hw.netdev_features; 2230 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2231 ndev->hw_features |= ndev->features & 2232 MAC80211_SUPPORTED_FEATURES_TX; 2233 2234 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2235 2236 /* MTU range is normally 256 - 2304, where the upper limit is 2237 * the maximum MSDU size. Monitor interfaces send and receive 2238 * MPDU and A-MSDU frames which may be much larger so we do 2239 * not impose an upper limit in that case. 2240 */ 2241 ndev->min_mtu = 256; 2242 if (type == NL80211_IFTYPE_MONITOR) 2243 ndev->max_mtu = 0; 2244 else 2245 ndev->max_mtu = local->hw.max_mtu; 2246 2247 ret = cfg80211_register_netdevice(ndev); 2248 if (ret) { 2249 free_netdev(ndev); 2250 return ret; 2251 } 2252 } 2253 2254 mutex_lock(&local->iflist_mtx); 2255 list_add_tail_rcu(&sdata->list, &local->interfaces); 2256 mutex_unlock(&local->iflist_mtx); 2257 2258 if (new_wdev) 2259 *new_wdev = &sdata->wdev; 2260 2261 return 0; 2262 } 2263 2264 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2265 { 2266 ASSERT_RTNL(); 2267 2268 mutex_lock(&sdata->local->iflist_mtx); 2269 list_del_rcu(&sdata->list); 2270 mutex_unlock(&sdata->local->iflist_mtx); 2271 2272 if (sdata->vif.txq) 2273 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2274 2275 synchronize_rcu(); 2276 2277 cfg80211_unregister_wdev(&sdata->wdev); 2278 2279 if (!sdata->dev) { 2280 ieee80211_teardown_sdata(sdata); 2281 kfree(sdata); 2282 } 2283 } 2284 2285 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2286 { 2287 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2288 return; 2289 ieee80211_do_stop(sdata, true); 2290 } 2291 2292 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2293 { 2294 struct ieee80211_sub_if_data *sdata, *tmp; 2295 LIST_HEAD(unreg_list); 2296 LIST_HEAD(wdev_list); 2297 2298 ASSERT_RTNL(); 2299 2300 /* Before destroying the interfaces, make sure they're all stopped so 2301 * that the hardware is stopped. Otherwise, the driver might still be 2302 * iterating the interfaces during the shutdown, e.g. from a worker 2303 * or from RX processing or similar, and if it does so (using atomic 2304 * iteration) while we're manipulating the list, the iteration will 2305 * crash. 2306 * 2307 * After this, the hardware should be stopped and the driver should 2308 * have stopped all of its activities, so that we can do RCU-unaware 2309 * manipulations of the interface list below. 2310 */ 2311 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2312 2313 WARN(local->open_count, "%s: open count remains %d\n", 2314 wiphy_name(local->hw.wiphy), local->open_count); 2315 2316 ieee80211_txq_teardown_flows(local); 2317 2318 mutex_lock(&local->iflist_mtx); 2319 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 2320 list_del(&sdata->list); 2321 2322 if (sdata->dev) 2323 unregister_netdevice_queue(sdata->dev, &unreg_list); 2324 else 2325 list_add(&sdata->list, &wdev_list); 2326 } 2327 mutex_unlock(&local->iflist_mtx); 2328 2329 unregister_netdevice_many(&unreg_list); 2330 2331 wiphy_lock(local->hw.wiphy); 2332 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 2333 list_del(&sdata->list); 2334 cfg80211_unregister_wdev(&sdata->wdev); 2335 kfree(sdata); 2336 } 2337 wiphy_unlock(local->hw.wiphy); 2338 } 2339 2340 static int netdev_notify(struct notifier_block *nb, 2341 unsigned long state, void *ptr) 2342 { 2343 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2344 struct ieee80211_sub_if_data *sdata; 2345 2346 if (state != NETDEV_CHANGENAME) 2347 return NOTIFY_DONE; 2348 2349 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2350 return NOTIFY_DONE; 2351 2352 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2353 return NOTIFY_DONE; 2354 2355 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2356 memcpy(sdata->name, dev->name, IFNAMSIZ); 2357 ieee80211_debugfs_rename_netdev(sdata); 2358 2359 return NOTIFY_OK; 2360 } 2361 2362 static struct notifier_block mac80211_netdev_notifier = { 2363 .notifier_call = netdev_notify, 2364 }; 2365 2366 int ieee80211_iface_init(void) 2367 { 2368 return register_netdevice_notifier(&mac80211_netdev_notifier); 2369 } 2370 2371 void ieee80211_iface_exit(void) 2372 { 2373 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2374 } 2375 2376 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2377 { 2378 if (sdata->vif.type == NL80211_IFTYPE_AP) 2379 atomic_inc(&sdata->u.ap.num_mcast_sta); 2380 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2381 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2382 } 2383 2384 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2385 { 2386 if (sdata->vif.type == NL80211_IFTYPE_AP) 2387 atomic_dec(&sdata->u.ap.num_mcast_sta); 2388 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2389 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2390 } 2391