1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Interface handling 4 * 5 * Copyright 2002-2005, Instant802 Networks, Inc. 6 * Copyright 2005-2006, Devicescape Software, Inc. 7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 9 * Copyright 2013-2014 Intel Mobile Communications GmbH 10 * Copyright (c) 2016 Intel Deutschland GmbH 11 * Copyright (C) 2018-2024 Intel Corporation 12 */ 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/if_arp.h> 16 #include <linux/netdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/kcov.h> 19 #include <net/mac80211.h> 20 #include <net/ieee80211_radiotap.h> 21 #include "ieee80211_i.h" 22 #include "sta_info.h" 23 #include "debugfs_netdev.h" 24 #include "mesh.h" 25 #include "led.h" 26 #include "driver-ops.h" 27 #include "wme.h" 28 #include "rate.h" 29 30 /** 31 * DOC: Interface list locking 32 * 33 * The interface list in each struct ieee80211_local is protected 34 * three-fold: 35 * 36 * (1) modifications may only be done under the RTNL *and* wiphy mutex 37 * *and* iflist_mtx 38 * (2) modifications are done in an RCU manner so atomic readers 39 * can traverse the list in RCU-safe blocks. 40 * 41 * As a consequence, reads (traversals) of the list can be protected 42 * by either the RTNL, the wiphy mutex, the iflist_mtx or RCU. 43 */ 44 45 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work); 46 47 bool __ieee80211_recalc_txpower(struct ieee80211_link_data *link) 48 { 49 struct ieee80211_chanctx_conf *chanctx_conf; 50 int power; 51 52 rcu_read_lock(); 53 chanctx_conf = rcu_dereference(link->conf->chanctx_conf); 54 if (!chanctx_conf) { 55 rcu_read_unlock(); 56 return false; 57 } 58 59 power = ieee80211_chandef_max_power(&chanctx_conf->def); 60 rcu_read_unlock(); 61 62 if (link->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 63 power = min(power, link->user_power_level); 64 65 if (link->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 66 power = min(power, link->ap_power_level); 67 68 if (power != link->conf->txpower) { 69 link->conf->txpower = power; 70 return true; 71 } 72 73 return false; 74 } 75 76 void ieee80211_recalc_txpower(struct ieee80211_link_data *link, 77 bool update_bss) 78 { 79 if (__ieee80211_recalc_txpower(link) || 80 (update_bss && ieee80211_sdata_running(link->sdata))) 81 ieee80211_link_info_change_notify(link->sdata, link, 82 BSS_CHANGED_TXPOWER); 83 } 84 85 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 86 { 87 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 88 return 0; 89 90 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 91 return IEEE80211_CONF_CHANGE_IDLE; 92 } 93 94 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 95 { 96 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 97 return 0; 98 99 ieee80211_flush_queues(local, NULL, false); 100 101 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 102 return IEEE80211_CONF_CHANGE_IDLE; 103 } 104 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 106 bool force_active) 107 { 108 bool working, scanning, active; 109 unsigned int led_trig_start = 0, led_trig_stop = 0; 110 111 lockdep_assert_wiphy(local->hw.wiphy); 112 113 active = force_active || 114 !list_empty(&local->chanctx_list) || 115 local->monitors; 116 117 working = !local->ops->remain_on_channel && 118 !list_empty(&local->roc_list); 119 120 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 121 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 122 123 if (working || scanning) 124 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 125 else 126 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 127 128 if (active) 129 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 130 else 131 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 132 133 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 134 135 if (working || scanning || active) 136 return __ieee80211_idle_off(local); 137 return __ieee80211_idle_on(local); 138 } 139 140 u32 ieee80211_idle_off(struct ieee80211_local *local) 141 { 142 return __ieee80211_recalc_idle(local, true); 143 } 144 145 void ieee80211_recalc_idle(struct ieee80211_local *local) 146 { 147 u32 change = __ieee80211_recalc_idle(local, false); 148 if (change) 149 ieee80211_hw_config(local, change); 150 } 151 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 153 bool check_dup) 154 { 155 struct ieee80211_local *local = sdata->local; 156 struct ieee80211_sub_if_data *iter; 157 u64 new, mask, tmp; 158 u8 *m; 159 int ret = 0; 160 161 lockdep_assert_wiphy(local->hw.wiphy); 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 list_for_each_entry(iter, &local->interfaces, list) { 180 if (iter == sdata) 181 continue; 182 183 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 184 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 185 continue; 186 187 m = iter->vif.addr; 188 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 189 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 190 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 191 192 if ((new & ~mask) != (tmp & ~mask)) { 193 ret = -EINVAL; 194 break; 195 } 196 } 197 198 return ret; 199 } 200 201 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 202 { 203 struct ieee80211_roc_work *roc; 204 struct ieee80211_local *local = sdata->local; 205 struct ieee80211_sub_if_data *scan_sdata; 206 int ret = 0; 207 208 lockdep_assert_wiphy(local->hw.wiphy); 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 /* First check no ROC work is happening on this iface */ 218 list_for_each_entry(roc, &local->roc_list, list) { 219 if (roc->sdata != sdata) 220 continue; 221 222 if (roc->started) { 223 ret = -EBUSY; 224 goto unlock; 225 } 226 } 227 228 /* And if this iface is scanning */ 229 if (local->scanning) { 230 scan_sdata = rcu_dereference_protected(local->scan_sdata, 231 lockdep_is_held(&local->hw.wiphy->mtx)); 232 if (sdata == scan_sdata) 233 ret = -EBUSY; 234 } 235 236 switch (sdata->vif.type) { 237 case NL80211_IFTYPE_STATION: 238 case NL80211_IFTYPE_P2P_CLIENT: 239 /* More interface types could be added here but changing the 240 * address while powered makes the most sense in client modes. 241 */ 242 break; 243 default: 244 ret = -EOPNOTSUPP; 245 } 246 247 unlock: 248 return ret; 249 } 250 251 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata, 252 void *addr) 253 { 254 struct ieee80211_local *local = sdata->local; 255 struct sockaddr *sa = addr; 256 bool check_dup = true; 257 bool live = false; 258 int ret; 259 260 if (ieee80211_sdata_running(sdata)) { 261 ret = ieee80211_can_powered_addr_change(sdata); 262 if (ret) 263 return ret; 264 265 live = true; 266 } 267 268 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 269 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 270 check_dup = false; 271 272 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 273 if (ret) 274 return ret; 275 276 if (live) 277 drv_remove_interface(local, sdata); 278 ret = eth_mac_addr(sdata->dev, sa); 279 280 if (ret == 0) { 281 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 282 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 283 } 284 285 /* Regardless of eth_mac_addr() return we still want to add the 286 * interface back. This should not fail... 287 */ 288 if (live) 289 WARN_ON(drv_add_interface(local, sdata)); 290 291 return ret; 292 } 293 294 static int ieee80211_change_mac(struct net_device *dev, void *addr) 295 { 296 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 297 struct ieee80211_local *local = sdata->local; 298 299 /* 300 * This happens during unregistration if there's a bond device 301 * active (maybe other cases?) and we must get removed from it. 302 * But we really don't care anymore if it's not registered now. 303 */ 304 if (!dev->ieee80211_ptr->registered) 305 return 0; 306 307 guard(wiphy)(local->hw.wiphy); 308 309 return _ieee80211_change_mac(sdata, addr); 310 } 311 312 static inline int identical_mac_addr_allowed(int type1, int type2) 313 { 314 return type1 == NL80211_IFTYPE_MONITOR || 315 type2 == NL80211_IFTYPE_MONITOR || 316 type1 == NL80211_IFTYPE_P2P_DEVICE || 317 type2 == NL80211_IFTYPE_P2P_DEVICE || 318 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 319 (type1 == NL80211_IFTYPE_AP_VLAN && 320 (type2 == NL80211_IFTYPE_AP || 321 type2 == NL80211_IFTYPE_AP_VLAN)); 322 } 323 324 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 325 enum nl80211_iftype iftype) 326 { 327 struct ieee80211_local *local = sdata->local; 328 struct ieee80211_sub_if_data *nsdata; 329 330 ASSERT_RTNL(); 331 lockdep_assert_wiphy(local->hw.wiphy); 332 333 /* we hold the RTNL here so can safely walk the list */ 334 list_for_each_entry(nsdata, &local->interfaces, list) { 335 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 336 /* 337 * Only OCB and monitor mode may coexist 338 */ 339 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 340 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 341 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 342 nsdata->vif.type == NL80211_IFTYPE_OCB)) 343 return -EBUSY; 344 345 /* 346 * Allow only a single IBSS interface to be up at any 347 * time. This is restricted because beacon distribution 348 * cannot work properly if both are in the same IBSS. 349 * 350 * To remove this restriction we'd have to disallow them 351 * from setting the same SSID on different IBSS interfaces 352 * belonging to the same hardware. Then, however, we're 353 * faced with having to adopt two different TSF timers... 354 */ 355 if (iftype == NL80211_IFTYPE_ADHOC && 356 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 357 return -EBUSY; 358 /* 359 * will not add another interface while any channel 360 * switch is active. 361 */ 362 if (nsdata->vif.bss_conf.csa_active) 363 return -EBUSY; 364 365 /* 366 * The remaining checks are only performed for interfaces 367 * with the same MAC address. 368 */ 369 if (!ether_addr_equal(sdata->vif.addr, 370 nsdata->vif.addr)) 371 continue; 372 373 /* 374 * check whether it may have the same address 375 */ 376 if (!identical_mac_addr_allowed(iftype, 377 nsdata->vif.type)) 378 return -ENOTUNIQ; 379 380 /* No support for VLAN with MLO yet */ 381 if (iftype == NL80211_IFTYPE_AP_VLAN && 382 sdata->wdev.use_4addr && 383 nsdata->vif.type == NL80211_IFTYPE_AP && 384 nsdata->vif.valid_links) 385 return -EOPNOTSUPP; 386 387 /* 388 * can only add VLANs to enabled APs 389 */ 390 if (iftype == NL80211_IFTYPE_AP_VLAN && 391 nsdata->vif.type == NL80211_IFTYPE_AP) 392 sdata->bss = &nsdata->u.ap; 393 } 394 } 395 396 return ieee80211_check_combinations(sdata, NULL, 0, 0, -1); 397 } 398 399 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 400 enum nl80211_iftype iftype) 401 { 402 int n_queues = sdata->local->hw.queues; 403 int i; 404 405 if (iftype == NL80211_IFTYPE_NAN) 406 return 0; 407 408 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 409 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 410 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 411 IEEE80211_INVAL_HW_QUEUE)) 412 return -EINVAL; 413 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 414 n_queues)) 415 return -EINVAL; 416 } 417 } 418 419 if ((iftype != NL80211_IFTYPE_AP && 420 iftype != NL80211_IFTYPE_P2P_GO && 421 iftype != NL80211_IFTYPE_MESH_POINT) || 422 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 423 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 424 return 0; 425 } 426 427 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 428 return -EINVAL; 429 430 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 431 return -EINVAL; 432 433 return 0; 434 } 435 436 static int ieee80211_open(struct net_device *dev) 437 { 438 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 439 int err; 440 441 /* fail early if user set an invalid address */ 442 if (!is_valid_ether_addr(dev->dev_addr)) 443 return -EADDRNOTAVAIL; 444 445 guard(wiphy)(sdata->local->hw.wiphy); 446 447 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 448 if (err) 449 return err; 450 451 return ieee80211_do_open(&sdata->wdev, true); 452 } 453 454 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 455 { 456 struct ieee80211_local *local = sdata->local; 457 unsigned long flags; 458 struct sk_buff_head freeq; 459 struct sk_buff *skb, *tmp; 460 u32 hw_reconf_flags = 0; 461 int i, flushed; 462 struct ps_data *ps; 463 struct cfg80211_chan_def chandef; 464 bool cancel_scan; 465 struct cfg80211_nan_func *func; 466 467 lockdep_assert_wiphy(local->hw.wiphy); 468 469 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 470 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 471 472 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 473 if (cancel_scan) 474 ieee80211_scan_cancel(local); 475 476 ieee80211_roc_purge(local, sdata); 477 478 switch (sdata->vif.type) { 479 case NL80211_IFTYPE_STATION: 480 ieee80211_mgd_stop(sdata); 481 break; 482 case NL80211_IFTYPE_ADHOC: 483 ieee80211_ibss_stop(sdata); 484 break; 485 case NL80211_IFTYPE_MONITOR: 486 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 487 break; 488 list_del_rcu(&sdata->u.mntr.list); 489 break; 490 default: 491 break; 492 } 493 494 /* 495 * Remove all stations associated with this interface. 496 * 497 * This must be done before calling ops->remove_interface() 498 * because otherwise we can later invoke ops->sta_notify() 499 * whenever the STAs are removed, and that invalidates driver 500 * assumptions about always getting a vif pointer that is valid 501 * (because if we remove a STA after ops->remove_interface() 502 * the driver will have removed the vif info already!) 503 * 504 * For AP_VLANs stations may exist since there's nothing else that 505 * would have removed them, but in other modes there shouldn't 506 * be any stations. 507 */ 508 flushed = sta_info_flush(sdata, -1); 509 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 510 511 /* don't count this interface for allmulti while it is down */ 512 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 513 atomic_dec(&local->iff_allmultis); 514 515 if (sdata->vif.type == NL80211_IFTYPE_AP) { 516 local->fif_pspoll--; 517 local->fif_probe_req--; 518 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 519 local->fif_probe_req--; 520 } 521 522 if (sdata->dev) { 523 netif_addr_lock_bh(sdata->dev); 524 spin_lock_bh(&local->filter_lock); 525 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 526 sdata->dev->addr_len); 527 spin_unlock_bh(&local->filter_lock); 528 netif_addr_unlock_bh(sdata->dev); 529 } 530 531 del_timer_sync(&local->dynamic_ps_timer); 532 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 533 534 WARN(ieee80211_vif_is_mld(&sdata->vif), 535 "destroying interface with valid links 0x%04x\n", 536 sdata->vif.valid_links); 537 538 sdata->vif.bss_conf.csa_active = false; 539 if (sdata->vif.type == NL80211_IFTYPE_STATION) 540 sdata->deflink.u.mgd.csa.waiting_bcn = false; 541 ieee80211_vif_unblock_queues_csa(sdata); 542 543 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); 544 wiphy_work_cancel(local->hw.wiphy, 545 &sdata->deflink.color_change_finalize_work); 546 wiphy_delayed_work_cancel(local->hw.wiphy, 547 &sdata->deflink.dfs_cac_timer_work); 548 549 if (sdata->wdev.links[0].cac_started) { 550 chandef = sdata->vif.bss_conf.chanreq.oper; 551 WARN_ON(local->suspended); 552 ieee80211_link_release_channel(&sdata->deflink); 553 cfg80211_cac_event(sdata->dev, &chandef, 554 NL80211_RADAR_CAC_ABORTED, 555 GFP_KERNEL, 0); 556 } 557 558 if (sdata->vif.type == NL80211_IFTYPE_AP) { 559 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 560 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 561 /* remove all packets in parent bc_buf pointing to this dev */ 562 ps = &sdata->bss->ps; 563 564 spin_lock_irqsave(&ps->bc_buf.lock, flags); 565 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 566 if (skb->dev == sdata->dev) { 567 __skb_unlink(skb, &ps->bc_buf); 568 local->total_ps_buffered--; 569 ieee80211_free_txskb(&local->hw, skb); 570 } 571 } 572 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 573 } 574 575 if (going_down) 576 local->open_count--; 577 578 switch (sdata->vif.type) { 579 case NL80211_IFTYPE_AP_VLAN: 580 list_del(&sdata->u.vlan.list); 581 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 582 /* see comment in the default case below */ 583 ieee80211_free_keys(sdata, true); 584 /* no need to tell driver */ 585 break; 586 case NL80211_IFTYPE_MONITOR: 587 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 588 local->cooked_mntrs--; 589 break; 590 } 591 592 local->monitors--; 593 if (local->monitors == 0) { 594 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 595 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 596 } 597 598 ieee80211_adjust_monitor_flags(sdata, -1); 599 break; 600 case NL80211_IFTYPE_NAN: 601 /* clean all the functions */ 602 spin_lock_bh(&sdata->u.nan.func_lock); 603 604 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 605 idr_remove(&sdata->u.nan.function_inst_ids, i); 606 cfg80211_free_nan_func(func); 607 } 608 idr_destroy(&sdata->u.nan.function_inst_ids); 609 610 spin_unlock_bh(&sdata->u.nan.func_lock); 611 break; 612 case NL80211_IFTYPE_P2P_DEVICE: 613 /* relies on synchronize_rcu() below */ 614 RCU_INIT_POINTER(local->p2p_sdata, NULL); 615 fallthrough; 616 default: 617 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 618 /* 619 * When we get here, the interface is marked down. 620 * Free the remaining keys, if there are any 621 * (which can happen in AP mode if userspace sets 622 * keys before the interface is operating) 623 * 624 * Force the key freeing to always synchronize_net() 625 * to wait for the RX path in case it is using this 626 * interface enqueuing frames at this very time on 627 * another CPU. 628 */ 629 ieee80211_free_keys(sdata, true); 630 skb_queue_purge(&sdata->skb_queue); 631 skb_queue_purge(&sdata->status_queue); 632 } 633 634 /* 635 * Since ieee80211_free_txskb() may issue __dev_queue_xmit() 636 * which should be called with interrupts enabled, reclamation 637 * is done in two phases: 638 */ 639 __skb_queue_head_init(&freeq); 640 641 /* unlink from local queues... */ 642 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 643 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 644 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 645 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 646 if (info->control.vif == &sdata->vif) { 647 __skb_unlink(skb, &local->pending[i]); 648 __skb_queue_tail(&freeq, skb); 649 } 650 } 651 } 652 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 653 654 /* ... and perform actual reclamation with interrupts enabled. */ 655 skb_queue_walk_safe(&freeq, skb, tmp) { 656 __skb_unlink(skb, &freeq); 657 ieee80211_free_txskb(&local->hw, skb); 658 } 659 660 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 661 ieee80211_txq_remove_vlan(local, sdata); 662 663 sdata->bss = NULL; 664 665 if (local->open_count == 0) 666 ieee80211_clear_tx_pending(local); 667 668 sdata->vif.bss_conf.beacon_int = 0; 669 670 /* 671 * If the interface goes down while suspended, presumably because 672 * the device was unplugged and that happens before our resume, 673 * then the driver is already unconfigured and the remainder of 674 * this function isn't needed. 675 * XXX: what about WoWLAN? If the device has software state, e.g. 676 * memory allocated, it might expect teardown commands from 677 * mac80211 here? 678 */ 679 if (local->suspended) { 680 WARN_ON(local->wowlan); 681 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 682 return; 683 } 684 685 switch (sdata->vif.type) { 686 case NL80211_IFTYPE_AP_VLAN: 687 break; 688 case NL80211_IFTYPE_MONITOR: 689 if (local->monitors == 0) 690 ieee80211_del_virtual_monitor(local); 691 692 ieee80211_recalc_idle(local); 693 ieee80211_recalc_offload(local); 694 695 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 696 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 697 break; 698 699 ieee80211_link_release_channel(&sdata->deflink); 700 fallthrough; 701 default: 702 if (!going_down) 703 break; 704 drv_remove_interface(local, sdata); 705 706 /* Clear private driver data to prevent reuse */ 707 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); 708 } 709 710 ieee80211_recalc_ps(local); 711 712 if (cancel_scan) 713 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 714 715 if (local->open_count == 0) { 716 ieee80211_stop_device(local, false); 717 718 /* no reconfiguring after stop! */ 719 return; 720 } 721 722 /* do after stop to avoid reconfiguring when we stop anyway */ 723 ieee80211_configure_filter(local); 724 ieee80211_hw_config(local, hw_reconf_flags); 725 726 if (local->monitors == local->open_count) 727 ieee80211_add_virtual_monitor(local); 728 } 729 730 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 731 { 732 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 733 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 734 735 if (!tx_vif) 736 return; 737 738 tx_sdata = vif_to_sdata(tx_vif); 739 sdata->vif.mbssid_tx_vif = NULL; 740 741 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 742 &tx_sdata->local->interfaces, list) { 743 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 744 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 745 ieee80211_sdata_running(non_tx_sdata)) { 746 non_tx_sdata->vif.mbssid_tx_vif = NULL; 747 dev_close(non_tx_sdata->wdev.netdev); 748 } 749 } 750 751 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 752 tx_sdata->vif.mbssid_tx_vif = NULL; 753 dev_close(tx_sdata->wdev.netdev); 754 } 755 } 756 757 static int ieee80211_stop(struct net_device *dev) 758 { 759 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 760 761 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 762 if (sdata->vif.type == NL80211_IFTYPE_AP) { 763 struct ieee80211_sub_if_data *vlan, *tmpsdata; 764 765 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 766 u.vlan.list) 767 dev_close(vlan->dev); 768 769 ieee80211_stop_mbssid(sdata); 770 } 771 772 guard(wiphy)(sdata->local->hw.wiphy); 773 774 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 775 776 ieee80211_do_stop(sdata, true); 777 778 return 0; 779 } 780 781 static void ieee80211_set_multicast_list(struct net_device *dev) 782 { 783 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 784 struct ieee80211_local *local = sdata->local; 785 int allmulti, sdata_allmulti; 786 787 allmulti = !!(dev->flags & IFF_ALLMULTI); 788 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 789 790 if (allmulti != sdata_allmulti) { 791 if (dev->flags & IFF_ALLMULTI) 792 atomic_inc(&local->iff_allmultis); 793 else 794 atomic_dec(&local->iff_allmultis); 795 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 796 } 797 798 spin_lock_bh(&local->filter_lock); 799 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 800 spin_unlock_bh(&local->filter_lock); 801 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 802 } 803 804 /* 805 * Called when the netdev is removed or, by the code below, before 806 * the interface type changes. 807 */ 808 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 809 { 810 /* free extra data */ 811 ieee80211_free_keys(sdata, false); 812 813 ieee80211_debugfs_remove_netdev(sdata); 814 815 ieee80211_destroy_frag_cache(&sdata->frags); 816 817 if (ieee80211_vif_is_mesh(&sdata->vif)) 818 ieee80211_mesh_teardown_sdata(sdata); 819 820 ieee80211_vif_clear_links(sdata); 821 ieee80211_link_stop(&sdata->deflink); 822 } 823 824 static void ieee80211_uninit(struct net_device *dev) 825 { 826 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 827 } 828 829 static int ieee80211_netdev_setup_tc(struct net_device *dev, 830 enum tc_setup_type type, void *type_data) 831 { 832 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 833 struct ieee80211_local *local = sdata->local; 834 835 return drv_net_setup_tc(local, sdata, dev, type, type_data); 836 } 837 838 static const struct net_device_ops ieee80211_dataif_ops = { 839 .ndo_open = ieee80211_open, 840 .ndo_stop = ieee80211_stop, 841 .ndo_uninit = ieee80211_uninit, 842 .ndo_start_xmit = ieee80211_subif_start_xmit, 843 .ndo_set_rx_mode = ieee80211_set_multicast_list, 844 .ndo_set_mac_address = ieee80211_change_mac, 845 .ndo_setup_tc = ieee80211_netdev_setup_tc, 846 }; 847 848 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 849 struct sk_buff *skb, 850 struct net_device *sb_dev) 851 { 852 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 853 struct ieee80211_local *local = sdata->local; 854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 855 struct ieee80211_hdr *hdr; 856 int len_rthdr; 857 858 if (local->hw.queues < IEEE80211_NUM_ACS) 859 return 0; 860 861 /* reset flags and info before parsing radiotap header */ 862 memset(info, 0, sizeof(*info)); 863 864 if (!ieee80211_parse_tx_radiotap(skb, dev)) 865 return 0; /* doesn't matter, frame will be dropped */ 866 867 len_rthdr = ieee80211_get_radiotap_len(skb->data); 868 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 869 if (skb->len < len_rthdr + 2 || 870 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 871 return 0; /* doesn't matter, frame will be dropped */ 872 873 return ieee80211_select_queue_80211(sdata, skb, hdr); 874 } 875 876 static const struct net_device_ops ieee80211_monitorif_ops = { 877 .ndo_open = ieee80211_open, 878 .ndo_stop = ieee80211_stop, 879 .ndo_uninit = ieee80211_uninit, 880 .ndo_start_xmit = ieee80211_monitor_start_xmit, 881 .ndo_set_rx_mode = ieee80211_set_multicast_list, 882 .ndo_set_mac_address = ieee80211_change_mac, 883 .ndo_select_queue = ieee80211_monitor_select_queue, 884 }; 885 886 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 887 struct net_device_path *path) 888 { 889 struct ieee80211_sub_if_data *sdata; 890 struct ieee80211_local *local; 891 struct sta_info *sta; 892 int ret = -ENOENT; 893 894 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 895 local = sdata->local; 896 897 if (!local->ops->net_fill_forward_path) 898 return -EOPNOTSUPP; 899 900 rcu_read_lock(); 901 switch (sdata->vif.type) { 902 case NL80211_IFTYPE_AP_VLAN: 903 sta = rcu_dereference(sdata->u.vlan.sta); 904 if (sta) 905 break; 906 if (sdata->wdev.use_4addr) 907 goto out; 908 if (is_multicast_ether_addr(ctx->daddr)) 909 goto out; 910 sta = sta_info_get_bss(sdata, ctx->daddr); 911 break; 912 case NL80211_IFTYPE_AP: 913 if (is_multicast_ether_addr(ctx->daddr)) 914 goto out; 915 sta = sta_info_get(sdata, ctx->daddr); 916 break; 917 case NL80211_IFTYPE_STATION: 918 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 919 sta = sta_info_get(sdata, ctx->daddr); 920 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 921 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 922 goto out; 923 924 break; 925 } 926 } 927 928 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 929 break; 930 default: 931 goto out; 932 } 933 934 if (!sta) 935 goto out; 936 937 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 938 out: 939 rcu_read_unlock(); 940 941 return ret; 942 } 943 944 static const struct net_device_ops ieee80211_dataif_8023_ops = { 945 .ndo_open = ieee80211_open, 946 .ndo_stop = ieee80211_stop, 947 .ndo_uninit = ieee80211_uninit, 948 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 949 .ndo_set_rx_mode = ieee80211_set_multicast_list, 950 .ndo_set_mac_address = ieee80211_change_mac, 951 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 952 .ndo_setup_tc = ieee80211_netdev_setup_tc, 953 }; 954 955 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 956 { 957 switch (iftype) { 958 /* P2P GO and client are mapped to AP/STATION types */ 959 case NL80211_IFTYPE_AP: 960 case NL80211_IFTYPE_STATION: 961 return true; 962 default: 963 return false; 964 } 965 } 966 967 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 968 { 969 struct ieee80211_local *local = sdata->local; 970 u32 flags; 971 972 flags = sdata->vif.offload_flags; 973 974 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 975 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 976 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 977 978 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 979 local->hw.wiphy->frag_threshold != (u32)-1) 980 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 981 982 if (local->monitors) 983 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 984 } else { 985 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 986 } 987 988 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 989 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 990 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 991 992 if (local->monitors && 993 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 994 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 995 } else { 996 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 997 } 998 999 if (sdata->vif.offload_flags == flags) 1000 return false; 1001 1002 sdata->vif.offload_flags = flags; 1003 ieee80211_check_fast_rx_iface(sdata); 1004 return true; 1005 } 1006 1007 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1008 { 1009 struct ieee80211_local *local = sdata->local; 1010 struct ieee80211_sub_if_data *bss = sdata; 1011 bool enabled; 1012 1013 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1014 if (!sdata->bss) 1015 return; 1016 1017 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1018 } 1019 1020 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1021 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1022 return; 1023 1024 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1025 if (sdata->wdev.use_4addr && 1026 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1027 enabled = false; 1028 1029 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1030 &ieee80211_dataif_ops; 1031 } 1032 1033 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1034 { 1035 struct ieee80211_local *local = sdata->local; 1036 struct ieee80211_sub_if_data *vsdata; 1037 1038 if (ieee80211_set_sdata_offload_flags(sdata)) { 1039 drv_update_vif_offload(local, sdata); 1040 ieee80211_set_vif_encap_ops(sdata); 1041 } 1042 1043 list_for_each_entry(vsdata, &local->interfaces, list) { 1044 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1045 vsdata->bss != &sdata->u.ap) 1046 continue; 1047 1048 ieee80211_set_vif_encap_ops(vsdata); 1049 } 1050 } 1051 1052 void ieee80211_recalc_offload(struct ieee80211_local *local) 1053 { 1054 struct ieee80211_sub_if_data *sdata; 1055 1056 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1057 return; 1058 1059 lockdep_assert_wiphy(local->hw.wiphy); 1060 1061 list_for_each_entry(sdata, &local->interfaces, list) { 1062 if (!ieee80211_sdata_running(sdata)) 1063 continue; 1064 1065 ieee80211_recalc_sdata_offload(sdata); 1066 } 1067 } 1068 1069 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1070 const int offset) 1071 { 1072 struct ieee80211_local *local = sdata->local; 1073 u32 flags = sdata->u.mntr.flags; 1074 1075 #define ADJUST(_f, _s) do { \ 1076 if (flags & MONITOR_FLAG_##_f) \ 1077 local->fif_##_s += offset; \ 1078 } while (0) 1079 1080 ADJUST(FCSFAIL, fcsfail); 1081 ADJUST(PLCPFAIL, plcpfail); 1082 ADJUST(CONTROL, control); 1083 ADJUST(CONTROL, pspoll); 1084 ADJUST(OTHER_BSS, other_bss); 1085 if (!(flags & MONITOR_FLAG_SKIP_TX)) 1086 local->tx_mntrs += offset; 1087 1088 #undef ADJUST 1089 } 1090 1091 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1092 { 1093 struct ieee80211_local *local = sdata->local; 1094 int i; 1095 1096 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1097 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1098 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1099 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1100 sdata->vif.hw_queue[i] = i; 1101 else 1102 sdata->vif.hw_queue[i] = 0; 1103 } 1104 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1105 } 1106 1107 static void ieee80211_sdata_init(struct ieee80211_local *local, 1108 struct ieee80211_sub_if_data *sdata) 1109 { 1110 sdata->local = local; 1111 1112 /* 1113 * Initialize the default link, so we can use link_id 0 for non-MLD, 1114 * and that continues to work for non-MLD-aware drivers that use just 1115 * vif.bss_conf instead of vif.link_conf. 1116 * 1117 * Note that we never change this, so if link ID 0 isn't used in an 1118 * MLD connection, we get a separate allocation for it. 1119 */ 1120 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1121 } 1122 1123 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1124 { 1125 struct ieee80211_sub_if_data *sdata; 1126 int ret; 1127 1128 ASSERT_RTNL(); 1129 lockdep_assert_wiphy(local->hw.wiphy); 1130 1131 if (local->monitor_sdata || 1132 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1133 return 0; 1134 1135 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1136 if (!sdata) 1137 return -ENOMEM; 1138 1139 /* set up data */ 1140 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1141 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1142 wiphy_name(local->hw.wiphy)); 1143 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1144 sdata->wdev.wiphy = local->hw.wiphy; 1145 1146 ieee80211_sdata_init(local, sdata); 1147 1148 ieee80211_set_default_queues(sdata); 1149 1150 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1151 ret = drv_add_interface(local, sdata); 1152 if (WARN_ON(ret)) { 1153 /* ok .. stupid driver, it asked for this! */ 1154 kfree(sdata); 1155 return ret; 1156 } 1157 } 1158 1159 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1160 1161 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1162 if (ret) { 1163 kfree(sdata); 1164 return ret; 1165 } 1166 1167 mutex_lock(&local->iflist_mtx); 1168 rcu_assign_pointer(local->monitor_sdata, sdata); 1169 mutex_unlock(&local->iflist_mtx); 1170 1171 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1172 IEEE80211_CHANCTX_EXCLUSIVE); 1173 if (ret) { 1174 mutex_lock(&local->iflist_mtx); 1175 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1176 mutex_unlock(&local->iflist_mtx); 1177 synchronize_net(); 1178 drv_remove_interface(local, sdata); 1179 kfree(sdata); 1180 return ret; 1181 } 1182 1183 skb_queue_head_init(&sdata->skb_queue); 1184 skb_queue_head_init(&sdata->status_queue); 1185 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1186 1187 return 0; 1188 } 1189 1190 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1191 { 1192 struct ieee80211_sub_if_data *sdata; 1193 1194 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1195 return; 1196 1197 ASSERT_RTNL(); 1198 lockdep_assert_wiphy(local->hw.wiphy); 1199 1200 mutex_lock(&local->iflist_mtx); 1201 1202 sdata = rcu_dereference_protected(local->monitor_sdata, 1203 lockdep_is_held(&local->iflist_mtx)); 1204 if (!sdata) { 1205 mutex_unlock(&local->iflist_mtx); 1206 return; 1207 } 1208 1209 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1210 ieee80211_link_release_channel(&sdata->deflink); 1211 1212 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1213 drv_remove_interface(local, sdata); 1214 1215 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1216 mutex_unlock(&local->iflist_mtx); 1217 1218 synchronize_net(); 1219 1220 kfree(sdata); 1221 } 1222 1223 /* 1224 * NOTE: Be very careful when changing this function, it must NOT return 1225 * an error on interface type changes that have been pre-checked, so most 1226 * checks should be in ieee80211_check_concurrent_iface. 1227 */ 1228 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1229 { 1230 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1231 struct net_device *dev = wdev->netdev; 1232 struct ieee80211_local *local = sdata->local; 1233 u64 changed = 0; 1234 int res; 1235 u32 hw_reconf_flags = 0; 1236 1237 lockdep_assert_wiphy(local->hw.wiphy); 1238 1239 switch (sdata->vif.type) { 1240 case NL80211_IFTYPE_AP_VLAN: { 1241 struct ieee80211_sub_if_data *master; 1242 1243 if (!sdata->bss) 1244 return -ENOLINK; 1245 1246 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1247 1248 master = container_of(sdata->bss, 1249 struct ieee80211_sub_if_data, u.ap); 1250 sdata->control_port_protocol = 1251 master->control_port_protocol; 1252 sdata->control_port_no_encrypt = 1253 master->control_port_no_encrypt; 1254 sdata->control_port_over_nl80211 = 1255 master->control_port_over_nl80211; 1256 sdata->control_port_no_preauth = 1257 master->control_port_no_preauth; 1258 sdata->vif.cab_queue = master->vif.cab_queue; 1259 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1260 sizeof(sdata->vif.hw_queue)); 1261 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1262 1263 sdata->crypto_tx_tailroom_needed_cnt += 1264 master->crypto_tx_tailroom_needed_cnt; 1265 1266 break; 1267 } 1268 case NL80211_IFTYPE_AP: 1269 sdata->bss = &sdata->u.ap; 1270 break; 1271 case NL80211_IFTYPE_MESH_POINT: 1272 case NL80211_IFTYPE_STATION: 1273 case NL80211_IFTYPE_MONITOR: 1274 case NL80211_IFTYPE_ADHOC: 1275 case NL80211_IFTYPE_P2P_DEVICE: 1276 case NL80211_IFTYPE_OCB: 1277 case NL80211_IFTYPE_NAN: 1278 /* no special treatment */ 1279 break; 1280 case NL80211_IFTYPE_UNSPECIFIED: 1281 case NUM_NL80211_IFTYPES: 1282 case NL80211_IFTYPE_P2P_CLIENT: 1283 case NL80211_IFTYPE_P2P_GO: 1284 case NL80211_IFTYPE_WDS: 1285 /* cannot happen */ 1286 WARN_ON(1); 1287 break; 1288 } 1289 1290 if (local->open_count == 0) { 1291 /* here we can consider everything in good order (again) */ 1292 local->reconfig_failure = false; 1293 1294 res = drv_start(local); 1295 if (res) 1296 goto err_del_bss; 1297 ieee80211_led_radio(local, true); 1298 ieee80211_mod_tpt_led_trig(local, 1299 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1300 } 1301 1302 /* 1303 * Copy the hopefully now-present MAC address to 1304 * this interface, if it has the special null one. 1305 */ 1306 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1307 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1308 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1309 1310 if (!is_valid_ether_addr(dev->dev_addr)) { 1311 res = -EADDRNOTAVAIL; 1312 goto err_stop; 1313 } 1314 } 1315 1316 sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR || 1317 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE); 1318 switch (sdata->vif.type) { 1319 case NL80211_IFTYPE_AP_VLAN: 1320 /* no need to tell driver, but set carrier and chanctx */ 1321 if (sdata->bss->active) { 1322 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1323 netif_carrier_on(dev); 1324 ieee80211_set_vif_encap_ops(sdata); 1325 } else { 1326 netif_carrier_off(dev); 1327 } 1328 break; 1329 case NL80211_IFTYPE_MONITOR: 1330 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1331 local->cooked_mntrs++; 1332 break; 1333 } 1334 1335 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1336 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1337 res = drv_add_interface(local, sdata); 1338 if (res) 1339 goto err_stop; 1340 } else if (local->monitors == 0 && local->open_count == 0) { 1341 res = ieee80211_add_virtual_monitor(local); 1342 if (res) 1343 goto err_stop; 1344 } 1345 1346 /* must be before the call to ieee80211_configure_filter */ 1347 local->monitors++; 1348 if (local->monitors == 1) { 1349 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1350 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1351 } 1352 1353 ieee80211_adjust_monitor_flags(sdata, 1); 1354 ieee80211_configure_filter(local); 1355 ieee80211_recalc_offload(local); 1356 ieee80211_recalc_idle(local); 1357 1358 netif_carrier_on(dev); 1359 break; 1360 default: 1361 if (coming_up) { 1362 ieee80211_del_virtual_monitor(local); 1363 ieee80211_set_sdata_offload_flags(sdata); 1364 1365 res = drv_add_interface(local, sdata); 1366 if (res) 1367 goto err_stop; 1368 1369 ieee80211_set_vif_encap_ops(sdata); 1370 res = ieee80211_check_queues(sdata, 1371 ieee80211_vif_type_p2p(&sdata->vif)); 1372 if (res) 1373 goto err_del_interface; 1374 } 1375 1376 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1377 local->fif_pspoll++; 1378 local->fif_probe_req++; 1379 1380 ieee80211_configure_filter(local); 1381 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1382 local->fif_probe_req++; 1383 } 1384 1385 if (sdata->vif.probe_req_reg) 1386 drv_config_iface_filter(local, sdata, 1387 FIF_PROBE_REQ, 1388 FIF_PROBE_REQ); 1389 1390 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1391 sdata->vif.type != NL80211_IFTYPE_NAN) 1392 changed |= ieee80211_reset_erp_info(sdata); 1393 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1394 changed); 1395 1396 switch (sdata->vif.type) { 1397 case NL80211_IFTYPE_STATION: 1398 case NL80211_IFTYPE_ADHOC: 1399 case NL80211_IFTYPE_AP: 1400 case NL80211_IFTYPE_MESH_POINT: 1401 case NL80211_IFTYPE_OCB: 1402 netif_carrier_off(dev); 1403 break; 1404 case NL80211_IFTYPE_P2P_DEVICE: 1405 case NL80211_IFTYPE_NAN: 1406 break; 1407 default: 1408 /* not reached */ 1409 WARN_ON(1); 1410 } 1411 1412 /* 1413 * Set default queue parameters so drivers don't 1414 * need to initialise the hardware if the hardware 1415 * doesn't start up with sane defaults. 1416 * Enable QoS for anything but station interfaces. 1417 */ 1418 ieee80211_set_wmm_default(&sdata->deflink, true, 1419 sdata->vif.type != NL80211_IFTYPE_STATION); 1420 } 1421 1422 switch (sdata->vif.type) { 1423 case NL80211_IFTYPE_P2P_DEVICE: 1424 rcu_assign_pointer(local->p2p_sdata, sdata); 1425 break; 1426 case NL80211_IFTYPE_MONITOR: 1427 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1428 break; 1429 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1430 break; 1431 default: 1432 break; 1433 } 1434 1435 /* 1436 * set_multicast_list will be invoked by the networking core 1437 * which will check whether any increments here were done in 1438 * error and sync them down to the hardware as filter flags. 1439 */ 1440 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1441 atomic_inc(&local->iff_allmultis); 1442 1443 if (coming_up) 1444 local->open_count++; 1445 1446 if (local->open_count == 1) 1447 ieee80211_hw_conf_init(local); 1448 else if (hw_reconf_flags) 1449 ieee80211_hw_config(local, hw_reconf_flags); 1450 1451 ieee80211_recalc_ps(local); 1452 1453 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1454 1455 return 0; 1456 err_del_interface: 1457 drv_remove_interface(local, sdata); 1458 err_stop: 1459 if (!local->open_count) 1460 drv_stop(local, false); 1461 err_del_bss: 1462 sdata->bss = NULL; 1463 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1464 list_del(&sdata->u.vlan.list); 1465 /* might already be clear but that doesn't matter */ 1466 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1467 return res; 1468 } 1469 1470 static void ieee80211_if_setup(struct net_device *dev) 1471 { 1472 ether_setup(dev); 1473 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1474 dev->priv_flags |= IFF_NO_QUEUE; 1475 dev->netdev_ops = &ieee80211_dataif_ops; 1476 dev->needs_free_netdev = true; 1477 } 1478 1479 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1480 struct ieee80211_sub_if_data *sdata, 1481 struct sk_buff *skb) 1482 { 1483 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1484 1485 lockdep_assert_wiphy(local->hw.wiphy); 1486 1487 if (ieee80211_is_action(mgmt->frame_control) && 1488 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1489 struct sta_info *sta; 1490 int len = skb->len; 1491 1492 sta = sta_info_get_bss(sdata, mgmt->sa); 1493 if (sta) { 1494 switch (mgmt->u.action.u.addba_req.action_code) { 1495 case WLAN_ACTION_ADDBA_REQ: 1496 ieee80211_process_addba_request(local, sta, 1497 mgmt, len); 1498 break; 1499 case WLAN_ACTION_ADDBA_RESP: 1500 ieee80211_process_addba_resp(local, sta, 1501 mgmt, len); 1502 break; 1503 case WLAN_ACTION_DELBA: 1504 ieee80211_process_delba(sdata, sta, 1505 mgmt, len); 1506 break; 1507 default: 1508 WARN_ON(1); 1509 break; 1510 } 1511 } 1512 } else if (ieee80211_is_action(mgmt->frame_control) && 1513 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1514 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1515 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1516 struct ieee80211_rx_status *status; 1517 enum nl80211_band band; 1518 struct sta_info *sta; 1519 u8 opmode; 1520 1521 status = IEEE80211_SKB_RXCB(skb); 1522 band = status->band; 1523 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1524 1525 sta = sta_info_get_bss(sdata, mgmt->sa); 1526 1527 if (sta) 1528 ieee80211_vht_handle_opmode(sdata, 1529 &sta->deflink, 1530 opmode, band); 1531 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_action(mgmt->frame_control) && 1553 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1554 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1555 switch (mgmt->u.action.u.ttlm_req.action_code) { 1556 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1557 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1558 skb->len); 1559 break; 1560 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1561 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1562 skb->len); 1563 break; 1564 case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP: 1565 ieee80211_process_ml_reconf_resp(sdata, mgmt, 1566 skb->len); 1567 break; 1568 default: 1569 break; 1570 } 1571 } 1572 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1573 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1574 ieee80211_sta_rx_queued_ext(sdata, skb); 1575 else 1576 WARN_ON(1); 1577 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1578 struct ieee80211_hdr *hdr = (void *)mgmt; 1579 struct sta_info *sta; 1580 1581 /* 1582 * So the frame isn't mgmt, but frame_control 1583 * is at the right place anyway, of course, so 1584 * the if statement is correct. 1585 * 1586 * Warn if we have other data frame types here, 1587 * they must not get here. 1588 */ 1589 WARN_ON(hdr->frame_control & 1590 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1591 WARN_ON(!(hdr->seq_ctrl & 1592 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1593 /* 1594 * This was a fragment of a frame, received while 1595 * a block-ack session was active. That cannot be 1596 * right, so terminate the session. 1597 */ 1598 sta = sta_info_get_bss(sdata, mgmt->sa); 1599 if (sta) { 1600 u16 tid = ieee80211_get_tid(hdr); 1601 1602 __ieee80211_stop_rx_ba_session( 1603 sta, tid, WLAN_BACK_RECIPIENT, 1604 WLAN_REASON_QSTA_REQUIRE_SETUP, 1605 true); 1606 } 1607 } else switch (sdata->vif.type) { 1608 case NL80211_IFTYPE_STATION: 1609 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1610 break; 1611 case NL80211_IFTYPE_ADHOC: 1612 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1613 break; 1614 case NL80211_IFTYPE_MESH_POINT: 1615 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1616 break; 1617 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1618 break; 1619 default: 1620 WARN(1, "frame for unexpected interface type"); 1621 break; 1622 } 1623 } 1624 1625 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1626 struct sk_buff *skb) 1627 { 1628 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1629 1630 if (ieee80211_is_action(mgmt->frame_control) && 1631 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1632 switch (mgmt->u.action.u.s1g.action_code) { 1633 case WLAN_S1G_TWT_TEARDOWN: 1634 case WLAN_S1G_TWT_SETUP: 1635 ieee80211_s1g_status_twt_action(sdata, skb); 1636 break; 1637 default: 1638 break; 1639 } 1640 } 1641 } 1642 1643 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1644 { 1645 struct ieee80211_sub_if_data *sdata = 1646 container_of(work, struct ieee80211_sub_if_data, work); 1647 struct ieee80211_local *local = sdata->local; 1648 struct sk_buff *skb; 1649 1650 if (!ieee80211_sdata_running(sdata)) 1651 return; 1652 1653 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1654 return; 1655 1656 if (!ieee80211_can_run_worker(local)) 1657 return; 1658 1659 /* first process frames */ 1660 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1661 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1662 1663 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1664 ieee80211_process_tdls_channel_switch(sdata, skb); 1665 else 1666 ieee80211_iface_process_skb(local, sdata, skb); 1667 1668 kfree_skb(skb); 1669 kcov_remote_stop(); 1670 } 1671 1672 /* process status queue */ 1673 while ((skb = skb_dequeue(&sdata->status_queue))) { 1674 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1675 1676 ieee80211_iface_process_status(sdata, skb); 1677 kfree_skb(skb); 1678 1679 kcov_remote_stop(); 1680 } 1681 1682 /* then other type-dependent work */ 1683 switch (sdata->vif.type) { 1684 case NL80211_IFTYPE_STATION: 1685 ieee80211_sta_work(sdata); 1686 break; 1687 case NL80211_IFTYPE_ADHOC: 1688 ieee80211_ibss_work(sdata); 1689 break; 1690 case NL80211_IFTYPE_MESH_POINT: 1691 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1692 break; 1693 ieee80211_mesh_work(sdata); 1694 break; 1695 case NL80211_IFTYPE_OCB: 1696 ieee80211_ocb_work(sdata); 1697 break; 1698 default: 1699 break; 1700 } 1701 } 1702 1703 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1704 struct wiphy_work *work) 1705 { 1706 struct ieee80211_sub_if_data *sdata = 1707 container_of(work, struct ieee80211_sub_if_data, 1708 activate_links_work); 1709 struct ieee80211_local *local = wiphy_priv(wiphy); 1710 1711 if (local->in_reconfig) 1712 return; 1713 1714 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1715 sdata->desired_active_links = 0; 1716 } 1717 1718 /* 1719 * Helper function to initialise an interface to a specific type. 1720 */ 1721 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1722 enum nl80211_iftype type) 1723 { 1724 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1725 0xff, 0xff, 0xff}; 1726 1727 /* clear type-dependent unions */ 1728 memset(&sdata->u, 0, sizeof(sdata->u)); 1729 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1730 1731 /* and set some type-dependent values */ 1732 sdata->vif.type = type; 1733 sdata->vif.p2p = false; 1734 sdata->wdev.iftype = type; 1735 1736 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1737 sdata->control_port_no_encrypt = false; 1738 sdata->control_port_over_nl80211 = false; 1739 sdata->control_port_no_preauth = false; 1740 sdata->vif.cfg.idle = true; 1741 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1742 1743 sdata->noack_map = 0; 1744 1745 /* only monitor/p2p-device differ */ 1746 if (sdata->dev) { 1747 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1748 sdata->dev->type = ARPHRD_ETHER; 1749 } 1750 1751 skb_queue_head_init(&sdata->skb_queue); 1752 skb_queue_head_init(&sdata->status_queue); 1753 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1754 wiphy_work_init(&sdata->activate_links_work, 1755 ieee80211_activate_links_work); 1756 1757 switch (type) { 1758 case NL80211_IFTYPE_P2P_GO: 1759 type = NL80211_IFTYPE_AP; 1760 sdata->vif.type = type; 1761 sdata->vif.p2p = true; 1762 fallthrough; 1763 case NL80211_IFTYPE_AP: 1764 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1765 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1766 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1767 break; 1768 case NL80211_IFTYPE_P2P_CLIENT: 1769 type = NL80211_IFTYPE_STATION; 1770 sdata->vif.type = type; 1771 sdata->vif.p2p = true; 1772 fallthrough; 1773 case NL80211_IFTYPE_STATION: 1774 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1775 ieee80211_sta_setup_sdata(sdata); 1776 break; 1777 case NL80211_IFTYPE_OCB: 1778 sdata->vif.bss_conf.bssid = bssid_wildcard; 1779 ieee80211_ocb_setup_sdata(sdata); 1780 break; 1781 case NL80211_IFTYPE_ADHOC: 1782 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1783 ieee80211_ibss_setup_sdata(sdata); 1784 break; 1785 case NL80211_IFTYPE_MESH_POINT: 1786 if (ieee80211_vif_is_mesh(&sdata->vif)) 1787 ieee80211_mesh_init_sdata(sdata); 1788 break; 1789 case NL80211_IFTYPE_MONITOR: 1790 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1791 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1792 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1793 MONITOR_FLAG_OTHER_BSS; 1794 break; 1795 case NL80211_IFTYPE_NAN: 1796 idr_init(&sdata->u.nan.function_inst_ids); 1797 spin_lock_init(&sdata->u.nan.func_lock); 1798 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1799 break; 1800 case NL80211_IFTYPE_AP_VLAN: 1801 case NL80211_IFTYPE_P2P_DEVICE: 1802 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1803 break; 1804 case NL80211_IFTYPE_UNSPECIFIED: 1805 case NL80211_IFTYPE_WDS: 1806 case NUM_NL80211_IFTYPES: 1807 WARN_ON(1); 1808 break; 1809 } 1810 1811 /* need to do this after the switch so vif.type is correct */ 1812 ieee80211_link_setup(&sdata->deflink); 1813 1814 ieee80211_debugfs_recreate_netdev(sdata, false); 1815 } 1816 1817 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1818 enum nl80211_iftype type) 1819 { 1820 struct ieee80211_local *local = sdata->local; 1821 int ret, err; 1822 enum nl80211_iftype internal_type = type; 1823 bool p2p = false; 1824 1825 ASSERT_RTNL(); 1826 1827 if (!local->ops->change_interface) 1828 return -EBUSY; 1829 1830 /* for now, don't support changing while links exist */ 1831 if (ieee80211_vif_is_mld(&sdata->vif)) 1832 return -EBUSY; 1833 1834 switch (sdata->vif.type) { 1835 case NL80211_IFTYPE_AP: 1836 if (!list_empty(&sdata->u.ap.vlans)) 1837 return -EBUSY; 1838 break; 1839 case NL80211_IFTYPE_STATION: 1840 case NL80211_IFTYPE_ADHOC: 1841 case NL80211_IFTYPE_OCB: 1842 /* 1843 * Could maybe also all others here? 1844 * Just not sure how that interacts 1845 * with the RX/config path e.g. for 1846 * mesh. 1847 */ 1848 break; 1849 default: 1850 return -EBUSY; 1851 } 1852 1853 switch (type) { 1854 case NL80211_IFTYPE_AP: 1855 case NL80211_IFTYPE_STATION: 1856 case NL80211_IFTYPE_ADHOC: 1857 case NL80211_IFTYPE_OCB: 1858 /* 1859 * Could probably support everything 1860 * but here. 1861 */ 1862 break; 1863 case NL80211_IFTYPE_P2P_CLIENT: 1864 p2p = true; 1865 internal_type = NL80211_IFTYPE_STATION; 1866 break; 1867 case NL80211_IFTYPE_P2P_GO: 1868 p2p = true; 1869 internal_type = NL80211_IFTYPE_AP; 1870 break; 1871 default: 1872 return -EBUSY; 1873 } 1874 1875 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1876 if (ret) 1877 return ret; 1878 1879 ieee80211_stop_vif_queues(local, sdata, 1880 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1881 /* do_stop will synchronize_rcu() first thing */ 1882 ieee80211_do_stop(sdata, false); 1883 1884 ieee80211_teardown_sdata(sdata); 1885 1886 ieee80211_set_sdata_offload_flags(sdata); 1887 ret = drv_change_interface(local, sdata, internal_type, p2p); 1888 if (ret) 1889 type = ieee80211_vif_type_p2p(&sdata->vif); 1890 1891 /* 1892 * Ignore return value here, there's not much we can do since 1893 * the driver changed the interface type internally already. 1894 * The warnings will hopefully make driver authors fix it :-) 1895 */ 1896 ieee80211_check_queues(sdata, type); 1897 1898 ieee80211_setup_sdata(sdata, type); 1899 ieee80211_set_vif_encap_ops(sdata); 1900 1901 err = ieee80211_do_open(&sdata->wdev, false); 1902 WARN(err, "type change: do_open returned %d", err); 1903 1904 ieee80211_wake_vif_queues(local, sdata, 1905 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1906 return ret; 1907 } 1908 1909 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1910 enum nl80211_iftype type) 1911 { 1912 int ret; 1913 1914 ASSERT_RTNL(); 1915 1916 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1917 return 0; 1918 1919 if (ieee80211_sdata_running(sdata)) { 1920 ret = ieee80211_runtime_change_iftype(sdata, type); 1921 if (ret) 1922 return ret; 1923 } else { 1924 /* Purge and reset type-dependent state. */ 1925 ieee80211_teardown_sdata(sdata); 1926 ieee80211_setup_sdata(sdata, type); 1927 } 1928 1929 /* reset some values that shouldn't be kept across type changes */ 1930 if (type == NL80211_IFTYPE_STATION) 1931 sdata->u.mgd.use_4addr = false; 1932 1933 return 0; 1934 } 1935 1936 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1937 u8 *perm_addr, enum nl80211_iftype type) 1938 { 1939 struct ieee80211_sub_if_data *sdata; 1940 u64 mask, start, addr, val, inc; 1941 u8 *m; 1942 u8 tmp_addr[ETH_ALEN]; 1943 int i; 1944 1945 lockdep_assert_wiphy(local->hw.wiphy); 1946 1947 /* default ... something at least */ 1948 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1949 1950 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1951 local->hw.wiphy->n_addresses <= 1) 1952 return; 1953 1954 switch (type) { 1955 case NL80211_IFTYPE_MONITOR: 1956 /* doesn't matter */ 1957 break; 1958 case NL80211_IFTYPE_AP_VLAN: 1959 /* match up with an AP interface */ 1960 list_for_each_entry(sdata, &local->interfaces, list) { 1961 if (sdata->vif.type != NL80211_IFTYPE_AP) 1962 continue; 1963 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1964 break; 1965 } 1966 /* keep default if no AP interface present */ 1967 break; 1968 case NL80211_IFTYPE_P2P_CLIENT: 1969 case NL80211_IFTYPE_P2P_GO: 1970 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1971 list_for_each_entry(sdata, &local->interfaces, list) { 1972 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1973 continue; 1974 if (!ieee80211_sdata_running(sdata)) 1975 continue; 1976 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1977 return; 1978 } 1979 } 1980 fallthrough; 1981 default: 1982 /* assign a new address if possible -- try n_addresses first */ 1983 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1984 bool used = false; 1985 1986 list_for_each_entry(sdata, &local->interfaces, list) { 1987 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1988 sdata->vif.addr)) { 1989 used = true; 1990 break; 1991 } 1992 } 1993 1994 if (!used) { 1995 memcpy(perm_addr, 1996 local->hw.wiphy->addresses[i].addr, 1997 ETH_ALEN); 1998 break; 1999 } 2000 } 2001 2002 /* try mask if available */ 2003 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 2004 break; 2005 2006 m = local->hw.wiphy->addr_mask; 2007 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2008 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2009 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2010 2011 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2012 /* not a contiguous mask ... not handled now! */ 2013 pr_info("not contiguous\n"); 2014 break; 2015 } 2016 2017 /* 2018 * Pick address of existing interface in case user changed 2019 * MAC address manually, default to perm_addr. 2020 */ 2021 m = local->hw.wiphy->perm_addr; 2022 list_for_each_entry(sdata, &local->interfaces, list) { 2023 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2024 continue; 2025 m = sdata->vif.addr; 2026 break; 2027 } 2028 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2029 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2030 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2031 2032 inc = 1ULL<<__ffs64(mask); 2033 val = (start & mask); 2034 addr = (start & ~mask) | (val & mask); 2035 do { 2036 bool used = false; 2037 2038 tmp_addr[5] = addr >> 0*8; 2039 tmp_addr[4] = addr >> 1*8; 2040 tmp_addr[3] = addr >> 2*8; 2041 tmp_addr[2] = addr >> 3*8; 2042 tmp_addr[1] = addr >> 4*8; 2043 tmp_addr[0] = addr >> 5*8; 2044 2045 val += inc; 2046 2047 list_for_each_entry(sdata, &local->interfaces, list) { 2048 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2049 used = true; 2050 break; 2051 } 2052 } 2053 2054 if (!used) { 2055 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2056 break; 2057 } 2058 addr = (start & ~mask) | (val & mask); 2059 } while (addr != start); 2060 2061 break; 2062 } 2063 } 2064 2065 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2066 unsigned char name_assign_type, 2067 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2068 struct vif_params *params) 2069 { 2070 struct net_device *ndev = NULL; 2071 struct ieee80211_sub_if_data *sdata = NULL; 2072 struct txq_info *txqi; 2073 int ret, i; 2074 2075 ASSERT_RTNL(); 2076 lockdep_assert_wiphy(local->hw.wiphy); 2077 2078 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2079 struct wireless_dev *wdev; 2080 2081 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2082 GFP_KERNEL); 2083 if (!sdata) 2084 return -ENOMEM; 2085 wdev = &sdata->wdev; 2086 2087 sdata->dev = NULL; 2088 strscpy(sdata->name, name, IFNAMSIZ); 2089 ieee80211_assign_perm_addr(local, wdev->address, type); 2090 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2091 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2092 } else { 2093 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2094 sizeof(void *)); 2095 int txq_size = 0; 2096 2097 if (type != NL80211_IFTYPE_AP_VLAN && 2098 (type != NL80211_IFTYPE_MONITOR || 2099 (params->flags & MONITOR_FLAG_ACTIVE))) 2100 txq_size += sizeof(struct txq_info) + 2101 local->hw.txq_data_size; 2102 2103 ndev = alloc_netdev_mqs(size + txq_size, 2104 name, name_assign_type, 2105 ieee80211_if_setup, 1, 1); 2106 if (!ndev) 2107 return -ENOMEM; 2108 2109 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2110 2111 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2112 2113 ndev->needed_headroom = local->tx_headroom + 2114 4*6 /* four MAC addresses */ 2115 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2116 + 6 /* mesh */ 2117 + 8 /* rfc1042/bridge tunnel */ 2118 - ETH_HLEN /* ethernet hard_header_len */ 2119 + IEEE80211_ENCRYPT_HEADROOM; 2120 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2121 2122 ret = dev_alloc_name(ndev, ndev->name); 2123 if (ret < 0) { 2124 free_netdev(ndev); 2125 return ret; 2126 } 2127 2128 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2129 if (is_valid_ether_addr(params->macaddr)) 2130 eth_hw_addr_set(ndev, params->macaddr); 2131 else 2132 eth_hw_addr_set(ndev, ndev->perm_addr); 2133 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2134 2135 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2136 sdata = netdev_priv(ndev); 2137 ndev->ieee80211_ptr = &sdata->wdev; 2138 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2139 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2140 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2141 2142 if (txq_size) { 2143 txqi = netdev_priv(ndev) + size; 2144 ieee80211_txq_init(sdata, NULL, txqi, 0); 2145 } 2146 2147 sdata->dev = ndev; 2148 } 2149 2150 /* initialise type-independent data */ 2151 sdata->wdev.wiphy = local->hw.wiphy; 2152 2153 ieee80211_sdata_init(local, sdata); 2154 2155 ieee80211_init_frag_cache(&sdata->frags); 2156 2157 INIT_LIST_HEAD(&sdata->key_list); 2158 2159 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2160 ieee80211_delayed_tailroom_dec); 2161 2162 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2163 struct ieee80211_supported_band *sband; 2164 sband = local->hw.wiphy->bands[i]; 2165 sdata->rc_rateidx_mask[i] = 2166 sband ? (1 << sband->n_bitrates) - 1 : 0; 2167 if (sband) { 2168 __le16 cap; 2169 u16 *vht_rate_mask; 2170 2171 memcpy(sdata->rc_rateidx_mcs_mask[i], 2172 sband->ht_cap.mcs.rx_mask, 2173 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2174 2175 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2176 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2177 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2178 } else { 2179 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2180 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2181 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2182 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2183 } 2184 } 2185 2186 ieee80211_set_default_queues(sdata); 2187 2188 /* setup type-dependent data */ 2189 ieee80211_setup_sdata(sdata, type); 2190 2191 if (ndev) { 2192 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2193 if (type == NL80211_IFTYPE_STATION) 2194 sdata->u.mgd.use_4addr = params->use_4addr; 2195 2196 ndev->features |= local->hw.netdev_features; 2197 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2198 ndev->hw_features |= ndev->features & 2199 MAC80211_SUPPORTED_FEATURES_TX; 2200 sdata->vif.netdev_features = local->hw.netdev_features; 2201 2202 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2203 2204 /* MTU range is normally 256 - 2304, where the upper limit is 2205 * the maximum MSDU size. Monitor interfaces send and receive 2206 * MPDU and A-MSDU frames which may be much larger so we do 2207 * not impose an upper limit in that case. 2208 */ 2209 ndev->min_mtu = 256; 2210 if (type == NL80211_IFTYPE_MONITOR) 2211 ndev->max_mtu = 0; 2212 else 2213 ndev->max_mtu = local->hw.max_mtu; 2214 2215 ret = cfg80211_register_netdevice(ndev); 2216 if (ret) { 2217 free_netdev(ndev); 2218 return ret; 2219 } 2220 } 2221 2222 mutex_lock(&local->iflist_mtx); 2223 list_add_tail_rcu(&sdata->list, &local->interfaces); 2224 mutex_unlock(&local->iflist_mtx); 2225 2226 if (new_wdev) 2227 *new_wdev = &sdata->wdev; 2228 2229 return 0; 2230 } 2231 2232 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2233 { 2234 ASSERT_RTNL(); 2235 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2236 2237 mutex_lock(&sdata->local->iflist_mtx); 2238 list_del_rcu(&sdata->list); 2239 mutex_unlock(&sdata->local->iflist_mtx); 2240 2241 if (sdata->vif.txq) 2242 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2243 2244 synchronize_rcu(); 2245 2246 cfg80211_unregister_wdev(&sdata->wdev); 2247 2248 if (!sdata->dev) { 2249 ieee80211_teardown_sdata(sdata); 2250 kfree(sdata); 2251 } 2252 } 2253 2254 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2255 { 2256 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2257 return; 2258 ieee80211_do_stop(sdata, true); 2259 } 2260 2261 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2262 { 2263 struct ieee80211_sub_if_data *sdata, *tmp; 2264 LIST_HEAD(unreg_list); 2265 2266 ASSERT_RTNL(); 2267 2268 /* Before destroying the interfaces, make sure they're all stopped so 2269 * that the hardware is stopped. Otherwise, the driver might still be 2270 * iterating the interfaces during the shutdown, e.g. from a worker 2271 * or from RX processing or similar, and if it does so (using atomic 2272 * iteration) while we're manipulating the list, the iteration will 2273 * crash. 2274 * 2275 * After this, the hardware should be stopped and the driver should 2276 * have stopped all of its activities, so that we can do RCU-unaware 2277 * manipulations of the interface list below. 2278 */ 2279 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2280 2281 guard(wiphy)(local->hw.wiphy); 2282 2283 WARN(local->open_count, "%s: open count remains %d\n", 2284 wiphy_name(local->hw.wiphy), local->open_count); 2285 2286 mutex_lock(&local->iflist_mtx); 2287 list_splice_init(&local->interfaces, &unreg_list); 2288 mutex_unlock(&local->iflist_mtx); 2289 2290 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2291 bool netdev = sdata->dev; 2292 2293 /* 2294 * Remove IP addresses explicitly, since the notifier will 2295 * skip the callbacks if wdev->registered is false, since 2296 * we can't acquire the wiphy_lock() again there if already 2297 * inside this locked section. 2298 */ 2299 sdata->vif.cfg.arp_addr_cnt = 0; 2300 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2301 sdata->u.mgd.associated) 2302 ieee80211_vif_cfg_change_notify(sdata, 2303 BSS_CHANGED_ARP_FILTER); 2304 2305 list_del(&sdata->list); 2306 cfg80211_unregister_wdev(&sdata->wdev); 2307 2308 if (!netdev) 2309 kfree(sdata); 2310 } 2311 } 2312 2313 static int netdev_notify(struct notifier_block *nb, 2314 unsigned long state, void *ptr) 2315 { 2316 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2317 struct ieee80211_sub_if_data *sdata; 2318 2319 if (state != NETDEV_CHANGENAME) 2320 return NOTIFY_DONE; 2321 2322 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2323 return NOTIFY_DONE; 2324 2325 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2326 return NOTIFY_DONE; 2327 2328 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2329 memcpy(sdata->name, dev->name, IFNAMSIZ); 2330 ieee80211_debugfs_rename_netdev(sdata); 2331 2332 return NOTIFY_OK; 2333 } 2334 2335 static struct notifier_block mac80211_netdev_notifier = { 2336 .notifier_call = netdev_notify, 2337 }; 2338 2339 int ieee80211_iface_init(void) 2340 { 2341 return register_netdevice_notifier(&mac80211_netdev_notifier); 2342 } 2343 2344 void ieee80211_iface_exit(void) 2345 { 2346 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2347 } 2348 2349 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2350 { 2351 if (sdata->vif.type == NL80211_IFTYPE_AP) 2352 atomic_inc(&sdata->u.ap.num_mcast_sta); 2353 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2354 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2355 } 2356 2357 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2358 { 2359 if (sdata->vif.type == NL80211_IFTYPE_AP) 2360 atomic_dec(&sdata->u.ap.num_mcast_sta); 2361 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2362 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2363 } 2364 2365 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2366 { 2367 struct ieee80211_local *local = sdata->local; 2368 2369 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2370 return; 2371 2372 ieee80211_stop_vif_queues_norefcount(local, sdata, 2373 IEEE80211_QUEUE_STOP_REASON_CSA); 2374 } 2375 2376 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2377 { 2378 struct ieee80211_local *local = sdata->local; 2379 2380 ieee80211_wake_vif_queues_norefcount(local, sdata, 2381 IEEE80211_QUEUE_STOP_REASON_CSA); 2382 } 2383