1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Interface handling 4 * 5 * Copyright 2002-2005, Instant802 Networks, Inc. 6 * Copyright 2005-2006, Devicescape Software, Inc. 7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 9 * Copyright 2013-2014 Intel Mobile Communications GmbH 10 * Copyright (c) 2016 Intel Deutschland GmbH 11 * Copyright (C) 2018-2024 Intel Corporation 12 */ 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/if_arp.h> 16 #include <linux/netdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/kcov.h> 19 #include <net/mac80211.h> 20 #include <net/ieee80211_radiotap.h> 21 #include "ieee80211_i.h" 22 #include "sta_info.h" 23 #include "debugfs_netdev.h" 24 #include "mesh.h" 25 #include "led.h" 26 #include "driver-ops.h" 27 #include "wme.h" 28 #include "rate.h" 29 30 /** 31 * DOC: Interface list locking 32 * 33 * The interface list in each struct ieee80211_local is protected 34 * three-fold: 35 * 36 * (1) modifications may only be done under the RTNL *and* wiphy mutex 37 * *and* iflist_mtx 38 * (2) modifications are done in an RCU manner so atomic readers 39 * can traverse the list in RCU-safe blocks. 40 * 41 * As a consequence, reads (traversals) of the list can be protected 42 * by either the RTNL, the wiphy mutex, the iflist_mtx or RCU. 43 */ 44 45 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work); 46 47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 48 { 49 struct ieee80211_chanctx_conf *chanctx_conf; 50 int power; 51 52 rcu_read_lock(); 53 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 54 if (!chanctx_conf) { 55 rcu_read_unlock(); 56 return false; 57 } 58 59 power = ieee80211_chandef_max_power(&chanctx_conf->def); 60 rcu_read_unlock(); 61 62 if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL) 63 power = min(power, sdata->deflink.user_power_level); 64 65 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 66 power = min(power, sdata->deflink.ap_power_level); 67 68 if (power != sdata->vif.bss_conf.txpower) { 69 sdata->vif.bss_conf.txpower = power; 70 ieee80211_hw_config(sdata->local, 0); 71 return true; 72 } 73 74 return false; 75 } 76 77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 78 bool update_bss) 79 { 80 if (__ieee80211_recalc_txpower(sdata) || 81 (update_bss && ieee80211_sdata_running(sdata))) 82 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 83 BSS_CHANGED_TXPOWER); 84 } 85 86 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 87 { 88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 89 return 0; 90 91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 92 return IEEE80211_CONF_CHANGE_IDLE; 93 } 94 95 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 96 { 97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 98 return 0; 99 100 ieee80211_flush_queues(local, NULL, false); 101 102 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 103 return IEEE80211_CONF_CHANGE_IDLE; 104 } 105 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 107 bool force_active) 108 { 109 bool working, scanning, active; 110 unsigned int led_trig_start = 0, led_trig_stop = 0; 111 112 lockdep_assert_wiphy(local->hw.wiphy); 113 114 active = force_active || 115 !list_empty(&local->chanctx_list) || 116 local->monitors; 117 118 working = !local->ops->remain_on_channel && 119 !list_empty(&local->roc_list); 120 121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 123 124 if (working || scanning) 125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 else 127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 128 129 if (active) 130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 else 132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 133 134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 135 136 if (working || scanning || active) 137 return __ieee80211_idle_off(local); 138 return __ieee80211_idle_on(local); 139 } 140 141 u32 ieee80211_idle_off(struct ieee80211_local *local) 142 { 143 return __ieee80211_recalc_idle(local, true); 144 } 145 146 void ieee80211_recalc_idle(struct ieee80211_local *local) 147 { 148 u32 change = __ieee80211_recalc_idle(local, false); 149 if (change) 150 ieee80211_hw_config(local, change); 151 } 152 153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 154 bool check_dup) 155 { 156 struct ieee80211_local *local = sdata->local; 157 struct ieee80211_sub_if_data *iter; 158 u64 new, mask, tmp; 159 u8 *m; 160 int ret = 0; 161 162 lockdep_assert_wiphy(local->hw.wiphy); 163 164 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 165 return 0; 166 167 m = addr; 168 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 169 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 170 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 171 172 m = local->hw.wiphy->addr_mask; 173 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 176 177 if (!check_dup) 178 return ret; 179 180 list_for_each_entry(iter, &local->interfaces, list) { 181 if (iter == sdata) 182 continue; 183 184 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 186 continue; 187 188 m = iter->vif.addr; 189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 192 193 if ((new & ~mask) != (tmp & ~mask)) { 194 ret = -EINVAL; 195 break; 196 } 197 } 198 199 return ret; 200 } 201 202 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 203 { 204 struct ieee80211_roc_work *roc; 205 struct ieee80211_local *local = sdata->local; 206 struct ieee80211_sub_if_data *scan_sdata; 207 int ret = 0; 208 209 lockdep_assert_wiphy(local->hw.wiphy); 210 211 /* To be the most flexible here we want to only limit changing the 212 * address if the specific interface is doing offchannel work or 213 * scanning. 214 */ 215 if (netif_carrier_ok(sdata->dev)) 216 return -EBUSY; 217 218 /* First check no ROC work is happening on this iface */ 219 list_for_each_entry(roc, &local->roc_list, list) { 220 if (roc->sdata != sdata) 221 continue; 222 223 if (roc->started) { 224 ret = -EBUSY; 225 goto unlock; 226 } 227 } 228 229 /* And if this iface is scanning */ 230 if (local->scanning) { 231 scan_sdata = rcu_dereference_protected(local->scan_sdata, 232 lockdep_is_held(&local->hw.wiphy->mtx)); 233 if (sdata == scan_sdata) 234 ret = -EBUSY; 235 } 236 237 switch (sdata->vif.type) { 238 case NL80211_IFTYPE_STATION: 239 case NL80211_IFTYPE_P2P_CLIENT: 240 /* More interface types could be added here but changing the 241 * address while powered makes the most sense in client modes. 242 */ 243 break; 244 default: 245 ret = -EOPNOTSUPP; 246 } 247 248 unlock: 249 return ret; 250 } 251 252 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata, 253 void *addr) 254 { 255 struct ieee80211_local *local = sdata->local; 256 struct sockaddr *sa = addr; 257 bool check_dup = true; 258 bool live = false; 259 int ret; 260 261 if (ieee80211_sdata_running(sdata)) { 262 ret = ieee80211_can_powered_addr_change(sdata); 263 if (ret) 264 return ret; 265 266 live = true; 267 } 268 269 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 270 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 271 check_dup = false; 272 273 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 274 if (ret) 275 return ret; 276 277 if (live) 278 drv_remove_interface(local, sdata); 279 ret = eth_mac_addr(sdata->dev, sa); 280 281 if (ret == 0) { 282 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 283 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 284 } 285 286 /* Regardless of eth_mac_addr() return we still want to add the 287 * interface back. This should not fail... 288 */ 289 if (live) 290 WARN_ON(drv_add_interface(local, sdata)); 291 292 return ret; 293 } 294 295 static int ieee80211_change_mac(struct net_device *dev, void *addr) 296 { 297 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 298 struct ieee80211_local *local = sdata->local; 299 int ret; 300 301 /* 302 * This happens during unregistration if there's a bond device 303 * active (maybe other cases?) and we must get removed from it. 304 * But we really don't care anymore if it's not registered now. 305 */ 306 if (!dev->ieee80211_ptr->registered) 307 return 0; 308 309 wiphy_lock(local->hw.wiphy); 310 ret = _ieee80211_change_mac(sdata, addr); 311 wiphy_unlock(local->hw.wiphy); 312 313 return ret; 314 } 315 316 static inline int identical_mac_addr_allowed(int type1, int type2) 317 { 318 return type1 == NL80211_IFTYPE_MONITOR || 319 type2 == NL80211_IFTYPE_MONITOR || 320 type1 == NL80211_IFTYPE_P2P_DEVICE || 321 type2 == NL80211_IFTYPE_P2P_DEVICE || 322 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 323 (type1 == NL80211_IFTYPE_AP_VLAN && 324 (type2 == NL80211_IFTYPE_AP || 325 type2 == NL80211_IFTYPE_AP_VLAN)); 326 } 327 328 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 329 enum nl80211_iftype iftype) 330 { 331 struct ieee80211_local *local = sdata->local; 332 struct ieee80211_sub_if_data *nsdata; 333 334 ASSERT_RTNL(); 335 lockdep_assert_wiphy(local->hw.wiphy); 336 337 /* we hold the RTNL here so can safely walk the list */ 338 list_for_each_entry(nsdata, &local->interfaces, list) { 339 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 340 /* 341 * Only OCB and monitor mode may coexist 342 */ 343 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 344 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 345 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 346 nsdata->vif.type == NL80211_IFTYPE_OCB)) 347 return -EBUSY; 348 349 /* 350 * Allow only a single IBSS interface to be up at any 351 * time. This is restricted because beacon distribution 352 * cannot work properly if both are in the same IBSS. 353 * 354 * To remove this restriction we'd have to disallow them 355 * from setting the same SSID on different IBSS interfaces 356 * belonging to the same hardware. Then, however, we're 357 * faced with having to adopt two different TSF timers... 358 */ 359 if (iftype == NL80211_IFTYPE_ADHOC && 360 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 361 return -EBUSY; 362 /* 363 * will not add another interface while any channel 364 * switch is active. 365 */ 366 if (nsdata->vif.bss_conf.csa_active) 367 return -EBUSY; 368 369 /* 370 * The remaining checks are only performed for interfaces 371 * with the same MAC address. 372 */ 373 if (!ether_addr_equal(sdata->vif.addr, 374 nsdata->vif.addr)) 375 continue; 376 377 /* 378 * check whether it may have the same address 379 */ 380 if (!identical_mac_addr_allowed(iftype, 381 nsdata->vif.type)) 382 return -ENOTUNIQ; 383 384 /* No support for VLAN with MLO yet */ 385 if (iftype == NL80211_IFTYPE_AP_VLAN && 386 sdata->wdev.use_4addr && 387 nsdata->vif.type == NL80211_IFTYPE_AP && 388 nsdata->vif.valid_links) 389 return -EOPNOTSUPP; 390 391 /* 392 * can only add VLANs to enabled APs 393 */ 394 if (iftype == NL80211_IFTYPE_AP_VLAN && 395 nsdata->vif.type == NL80211_IFTYPE_AP) 396 sdata->bss = &nsdata->u.ap; 397 } 398 } 399 400 return ieee80211_check_combinations(sdata, NULL, 0, 0); 401 } 402 403 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 404 enum nl80211_iftype iftype) 405 { 406 int n_queues = sdata->local->hw.queues; 407 int i; 408 409 if (iftype == NL80211_IFTYPE_NAN) 410 return 0; 411 412 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 413 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 414 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 415 IEEE80211_INVAL_HW_QUEUE)) 416 return -EINVAL; 417 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 418 n_queues)) 419 return -EINVAL; 420 } 421 } 422 423 if ((iftype != NL80211_IFTYPE_AP && 424 iftype != NL80211_IFTYPE_P2P_GO && 425 iftype != NL80211_IFTYPE_MESH_POINT) || 426 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 427 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 428 return 0; 429 } 430 431 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 432 return -EINVAL; 433 434 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 435 return -EINVAL; 436 437 return 0; 438 } 439 440 static int ieee80211_open(struct net_device *dev) 441 { 442 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 443 int err; 444 445 /* fail early if user set an invalid address */ 446 if (!is_valid_ether_addr(dev->dev_addr)) 447 return -EADDRNOTAVAIL; 448 449 wiphy_lock(sdata->local->hw.wiphy); 450 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 451 if (err) 452 goto out; 453 454 err = ieee80211_do_open(&sdata->wdev, true); 455 out: 456 wiphy_unlock(sdata->local->hw.wiphy); 457 458 return err; 459 } 460 461 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 462 { 463 struct ieee80211_local *local = sdata->local; 464 unsigned long flags; 465 struct sk_buff *skb, *tmp; 466 u32 hw_reconf_flags = 0; 467 int i, flushed; 468 struct ps_data *ps; 469 struct cfg80211_chan_def chandef; 470 bool cancel_scan; 471 struct cfg80211_nan_func *func; 472 473 lockdep_assert_wiphy(local->hw.wiphy); 474 475 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 476 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 477 478 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 479 if (cancel_scan) 480 ieee80211_scan_cancel(local); 481 482 ieee80211_roc_purge(local, sdata); 483 484 switch (sdata->vif.type) { 485 case NL80211_IFTYPE_STATION: 486 ieee80211_mgd_stop(sdata); 487 break; 488 case NL80211_IFTYPE_ADHOC: 489 ieee80211_ibss_stop(sdata); 490 break; 491 case NL80211_IFTYPE_MONITOR: 492 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 493 break; 494 list_del_rcu(&sdata->u.mntr.list); 495 break; 496 default: 497 break; 498 } 499 500 /* 501 * Remove all stations associated with this interface. 502 * 503 * This must be done before calling ops->remove_interface() 504 * because otherwise we can later invoke ops->sta_notify() 505 * whenever the STAs are removed, and that invalidates driver 506 * assumptions about always getting a vif pointer that is valid 507 * (because if we remove a STA after ops->remove_interface() 508 * the driver will have removed the vif info already!) 509 * 510 * For AP_VLANs stations may exist since there's nothing else that 511 * would have removed them, but in other modes there shouldn't 512 * be any stations. 513 */ 514 flushed = sta_info_flush(sdata, -1); 515 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 516 517 /* don't count this interface for allmulti while it is down */ 518 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 519 atomic_dec(&local->iff_allmultis); 520 521 if (sdata->vif.type == NL80211_IFTYPE_AP) { 522 local->fif_pspoll--; 523 local->fif_probe_req--; 524 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 525 local->fif_probe_req--; 526 } 527 528 if (sdata->dev) { 529 netif_addr_lock_bh(sdata->dev); 530 spin_lock_bh(&local->filter_lock); 531 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 532 sdata->dev->addr_len); 533 spin_unlock_bh(&local->filter_lock); 534 netif_addr_unlock_bh(sdata->dev); 535 } 536 537 del_timer_sync(&local->dynamic_ps_timer); 538 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 539 540 WARN(ieee80211_vif_is_mld(&sdata->vif), 541 "destroying interface with valid links 0x%04x\n", 542 sdata->vif.valid_links); 543 544 sdata->vif.bss_conf.csa_active = false; 545 if (sdata->vif.type == NL80211_IFTYPE_STATION) 546 sdata->deflink.u.mgd.csa.waiting_bcn = false; 547 ieee80211_vif_unblock_queues_csa(sdata); 548 549 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); 550 wiphy_work_cancel(local->hw.wiphy, 551 &sdata->deflink.color_change_finalize_work); 552 wiphy_delayed_work_cancel(local->hw.wiphy, 553 &sdata->dfs_cac_timer_work); 554 555 if (sdata->wdev.cac_started) { 556 chandef = sdata->vif.bss_conf.chanreq.oper; 557 WARN_ON(local->suspended); 558 ieee80211_link_release_channel(&sdata->deflink); 559 cfg80211_cac_event(sdata->dev, &chandef, 560 NL80211_RADAR_CAC_ABORTED, 561 GFP_KERNEL); 562 } 563 564 if (sdata->vif.type == NL80211_IFTYPE_AP) { 565 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 566 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 567 /* remove all packets in parent bc_buf pointing to this dev */ 568 ps = &sdata->bss->ps; 569 570 spin_lock_irqsave(&ps->bc_buf.lock, flags); 571 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 572 if (skb->dev == sdata->dev) { 573 __skb_unlink(skb, &ps->bc_buf); 574 local->total_ps_buffered--; 575 ieee80211_free_txskb(&local->hw, skb); 576 } 577 } 578 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 579 } 580 581 if (going_down) 582 local->open_count--; 583 584 switch (sdata->vif.type) { 585 case NL80211_IFTYPE_AP_VLAN: 586 list_del(&sdata->u.vlan.list); 587 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 588 /* see comment in the default case below */ 589 ieee80211_free_keys(sdata, true); 590 /* no need to tell driver */ 591 break; 592 case NL80211_IFTYPE_MONITOR: 593 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 594 local->cooked_mntrs--; 595 break; 596 } 597 598 local->monitors--; 599 if (local->monitors == 0) { 600 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 601 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 602 } 603 604 ieee80211_adjust_monitor_flags(sdata, -1); 605 break; 606 case NL80211_IFTYPE_NAN: 607 /* clean all the functions */ 608 spin_lock_bh(&sdata->u.nan.func_lock); 609 610 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 611 idr_remove(&sdata->u.nan.function_inst_ids, i); 612 cfg80211_free_nan_func(func); 613 } 614 idr_destroy(&sdata->u.nan.function_inst_ids); 615 616 spin_unlock_bh(&sdata->u.nan.func_lock); 617 break; 618 case NL80211_IFTYPE_P2P_DEVICE: 619 /* relies on synchronize_rcu() below */ 620 RCU_INIT_POINTER(local->p2p_sdata, NULL); 621 fallthrough; 622 default: 623 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 624 /* 625 * When we get here, the interface is marked down. 626 * Free the remaining keys, if there are any 627 * (which can happen in AP mode if userspace sets 628 * keys before the interface is operating) 629 * 630 * Force the key freeing to always synchronize_net() 631 * to wait for the RX path in case it is using this 632 * interface enqueuing frames at this very time on 633 * another CPU. 634 */ 635 ieee80211_free_keys(sdata, true); 636 skb_queue_purge(&sdata->skb_queue); 637 skb_queue_purge(&sdata->status_queue); 638 } 639 640 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 641 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 642 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 644 if (info->control.vif == &sdata->vif) { 645 __skb_unlink(skb, &local->pending[i]); 646 ieee80211_free_txskb(&local->hw, skb); 647 } 648 } 649 } 650 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 651 652 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 653 ieee80211_txq_remove_vlan(local, sdata); 654 655 sdata->bss = NULL; 656 657 if (local->open_count == 0) 658 ieee80211_clear_tx_pending(local); 659 660 sdata->vif.bss_conf.beacon_int = 0; 661 662 /* 663 * If the interface goes down while suspended, presumably because 664 * the device was unplugged and that happens before our resume, 665 * then the driver is already unconfigured and the remainder of 666 * this function isn't needed. 667 * XXX: what about WoWLAN? If the device has software state, e.g. 668 * memory allocated, it might expect teardown commands from 669 * mac80211 here? 670 */ 671 if (local->suspended) { 672 WARN_ON(local->wowlan); 673 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 674 return; 675 } 676 677 switch (sdata->vif.type) { 678 case NL80211_IFTYPE_AP_VLAN: 679 break; 680 case NL80211_IFTYPE_MONITOR: 681 if (local->monitors == 0) 682 ieee80211_del_virtual_monitor(local); 683 684 ieee80211_recalc_idle(local); 685 ieee80211_recalc_offload(local); 686 687 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 688 break; 689 690 fallthrough; 691 default: 692 if (going_down) 693 drv_remove_interface(local, sdata); 694 } 695 696 ieee80211_recalc_ps(local); 697 698 if (cancel_scan) 699 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 700 701 if (local->open_count == 0) { 702 ieee80211_stop_device(local, false); 703 704 /* no reconfiguring after stop! */ 705 return; 706 } 707 708 /* do after stop to avoid reconfiguring when we stop anyway */ 709 ieee80211_configure_filter(local); 710 ieee80211_hw_config(local, hw_reconf_flags); 711 712 if (local->monitors == local->open_count) 713 ieee80211_add_virtual_monitor(local); 714 } 715 716 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 717 { 718 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 719 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 720 721 if (!tx_vif) 722 return; 723 724 tx_sdata = vif_to_sdata(tx_vif); 725 sdata->vif.mbssid_tx_vif = NULL; 726 727 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 728 &tx_sdata->local->interfaces, list) { 729 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 730 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 731 ieee80211_sdata_running(non_tx_sdata)) { 732 non_tx_sdata->vif.mbssid_tx_vif = NULL; 733 dev_close(non_tx_sdata->wdev.netdev); 734 } 735 } 736 737 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 738 tx_sdata->vif.mbssid_tx_vif = NULL; 739 dev_close(tx_sdata->wdev.netdev); 740 } 741 } 742 743 static int ieee80211_stop(struct net_device *dev) 744 { 745 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 746 747 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 748 if (sdata->vif.type == NL80211_IFTYPE_AP) { 749 struct ieee80211_sub_if_data *vlan, *tmpsdata; 750 751 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 752 u.vlan.list) 753 dev_close(vlan->dev); 754 755 ieee80211_stop_mbssid(sdata); 756 } 757 758 wiphy_lock(sdata->local->hw.wiphy); 759 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 760 761 ieee80211_do_stop(sdata, true); 762 wiphy_unlock(sdata->local->hw.wiphy); 763 764 return 0; 765 } 766 767 static void ieee80211_set_multicast_list(struct net_device *dev) 768 { 769 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 770 struct ieee80211_local *local = sdata->local; 771 int allmulti, sdata_allmulti; 772 773 allmulti = !!(dev->flags & IFF_ALLMULTI); 774 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 775 776 if (allmulti != sdata_allmulti) { 777 if (dev->flags & IFF_ALLMULTI) 778 atomic_inc(&local->iff_allmultis); 779 else 780 atomic_dec(&local->iff_allmultis); 781 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 782 } 783 784 spin_lock_bh(&local->filter_lock); 785 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 786 spin_unlock_bh(&local->filter_lock); 787 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 788 } 789 790 /* 791 * Called when the netdev is removed or, by the code below, before 792 * the interface type changes. 793 */ 794 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 795 { 796 /* free extra data */ 797 ieee80211_free_keys(sdata, false); 798 799 ieee80211_debugfs_remove_netdev(sdata); 800 801 ieee80211_destroy_frag_cache(&sdata->frags); 802 803 if (ieee80211_vif_is_mesh(&sdata->vif)) 804 ieee80211_mesh_teardown_sdata(sdata); 805 806 ieee80211_vif_clear_links(sdata); 807 ieee80211_link_stop(&sdata->deflink); 808 } 809 810 static void ieee80211_uninit(struct net_device *dev) 811 { 812 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 813 } 814 815 static int ieee80211_netdev_setup_tc(struct net_device *dev, 816 enum tc_setup_type type, void *type_data) 817 { 818 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 819 struct ieee80211_local *local = sdata->local; 820 821 return drv_net_setup_tc(local, sdata, dev, type, type_data); 822 } 823 824 static const struct net_device_ops ieee80211_dataif_ops = { 825 .ndo_open = ieee80211_open, 826 .ndo_stop = ieee80211_stop, 827 .ndo_uninit = ieee80211_uninit, 828 .ndo_start_xmit = ieee80211_subif_start_xmit, 829 .ndo_set_rx_mode = ieee80211_set_multicast_list, 830 .ndo_set_mac_address = ieee80211_change_mac, 831 .ndo_setup_tc = ieee80211_netdev_setup_tc, 832 }; 833 834 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 835 struct sk_buff *skb, 836 struct net_device *sb_dev) 837 { 838 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 839 struct ieee80211_local *local = sdata->local; 840 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 841 struct ieee80211_hdr *hdr; 842 int len_rthdr; 843 844 if (local->hw.queues < IEEE80211_NUM_ACS) 845 return 0; 846 847 /* reset flags and info before parsing radiotap header */ 848 memset(info, 0, sizeof(*info)); 849 850 if (!ieee80211_parse_tx_radiotap(skb, dev)) 851 return 0; /* doesn't matter, frame will be dropped */ 852 853 len_rthdr = ieee80211_get_radiotap_len(skb->data); 854 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 855 if (skb->len < len_rthdr + 2 || 856 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 857 return 0; /* doesn't matter, frame will be dropped */ 858 859 return ieee80211_select_queue_80211(sdata, skb, hdr); 860 } 861 862 static const struct net_device_ops ieee80211_monitorif_ops = { 863 .ndo_open = ieee80211_open, 864 .ndo_stop = ieee80211_stop, 865 .ndo_uninit = ieee80211_uninit, 866 .ndo_start_xmit = ieee80211_monitor_start_xmit, 867 .ndo_set_rx_mode = ieee80211_set_multicast_list, 868 .ndo_set_mac_address = ieee80211_change_mac, 869 .ndo_select_queue = ieee80211_monitor_select_queue, 870 }; 871 872 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 873 struct net_device_path *path) 874 { 875 struct ieee80211_sub_if_data *sdata; 876 struct ieee80211_local *local; 877 struct sta_info *sta; 878 int ret = -ENOENT; 879 880 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 881 local = sdata->local; 882 883 if (!local->ops->net_fill_forward_path) 884 return -EOPNOTSUPP; 885 886 rcu_read_lock(); 887 switch (sdata->vif.type) { 888 case NL80211_IFTYPE_AP_VLAN: 889 sta = rcu_dereference(sdata->u.vlan.sta); 890 if (sta) 891 break; 892 if (sdata->wdev.use_4addr) 893 goto out; 894 if (is_multicast_ether_addr(ctx->daddr)) 895 goto out; 896 sta = sta_info_get_bss(sdata, ctx->daddr); 897 break; 898 case NL80211_IFTYPE_AP: 899 if (is_multicast_ether_addr(ctx->daddr)) 900 goto out; 901 sta = sta_info_get(sdata, ctx->daddr); 902 break; 903 case NL80211_IFTYPE_STATION: 904 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 905 sta = sta_info_get(sdata, ctx->daddr); 906 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 907 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 908 goto out; 909 910 break; 911 } 912 } 913 914 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 915 break; 916 default: 917 goto out; 918 } 919 920 if (!sta) 921 goto out; 922 923 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 924 out: 925 rcu_read_unlock(); 926 927 return ret; 928 } 929 930 static const struct net_device_ops ieee80211_dataif_8023_ops = { 931 .ndo_open = ieee80211_open, 932 .ndo_stop = ieee80211_stop, 933 .ndo_uninit = ieee80211_uninit, 934 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 935 .ndo_set_rx_mode = ieee80211_set_multicast_list, 936 .ndo_set_mac_address = ieee80211_change_mac, 937 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 938 .ndo_setup_tc = ieee80211_netdev_setup_tc, 939 }; 940 941 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 942 { 943 switch (iftype) { 944 /* P2P GO and client are mapped to AP/STATION types */ 945 case NL80211_IFTYPE_AP: 946 case NL80211_IFTYPE_STATION: 947 return true; 948 default: 949 return false; 950 } 951 } 952 953 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 954 { 955 struct ieee80211_local *local = sdata->local; 956 u32 flags; 957 958 flags = sdata->vif.offload_flags; 959 960 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 961 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 962 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 963 964 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 965 local->hw.wiphy->frag_threshold != (u32)-1) 966 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 967 968 if (local->monitors) 969 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 970 } else { 971 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 972 } 973 974 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 975 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 976 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 977 978 if (local->monitors && 979 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 980 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 981 } else { 982 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 983 } 984 985 if (sdata->vif.offload_flags == flags) 986 return false; 987 988 sdata->vif.offload_flags = flags; 989 ieee80211_check_fast_rx_iface(sdata); 990 return true; 991 } 992 993 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 994 { 995 struct ieee80211_local *local = sdata->local; 996 struct ieee80211_sub_if_data *bss = sdata; 997 bool enabled; 998 999 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1000 if (!sdata->bss) 1001 return; 1002 1003 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1004 } 1005 1006 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1007 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1008 return; 1009 1010 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1011 if (sdata->wdev.use_4addr && 1012 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1013 enabled = false; 1014 1015 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1016 &ieee80211_dataif_ops; 1017 } 1018 1019 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1020 { 1021 struct ieee80211_local *local = sdata->local; 1022 struct ieee80211_sub_if_data *vsdata; 1023 1024 if (ieee80211_set_sdata_offload_flags(sdata)) { 1025 drv_update_vif_offload(local, sdata); 1026 ieee80211_set_vif_encap_ops(sdata); 1027 } 1028 1029 list_for_each_entry(vsdata, &local->interfaces, list) { 1030 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1031 vsdata->bss != &sdata->u.ap) 1032 continue; 1033 1034 ieee80211_set_vif_encap_ops(vsdata); 1035 } 1036 } 1037 1038 void ieee80211_recalc_offload(struct ieee80211_local *local) 1039 { 1040 struct ieee80211_sub_if_data *sdata; 1041 1042 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1043 return; 1044 1045 lockdep_assert_wiphy(local->hw.wiphy); 1046 1047 list_for_each_entry(sdata, &local->interfaces, list) { 1048 if (!ieee80211_sdata_running(sdata)) 1049 continue; 1050 1051 ieee80211_recalc_sdata_offload(sdata); 1052 } 1053 } 1054 1055 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1056 const int offset) 1057 { 1058 struct ieee80211_local *local = sdata->local; 1059 u32 flags = sdata->u.mntr.flags; 1060 1061 #define ADJUST(_f, _s) do { \ 1062 if (flags & MONITOR_FLAG_##_f) \ 1063 local->fif_##_s += offset; \ 1064 } while (0) 1065 1066 ADJUST(FCSFAIL, fcsfail); 1067 ADJUST(PLCPFAIL, plcpfail); 1068 ADJUST(CONTROL, control); 1069 ADJUST(CONTROL, pspoll); 1070 ADJUST(OTHER_BSS, other_bss); 1071 1072 #undef ADJUST 1073 } 1074 1075 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1076 { 1077 struct ieee80211_local *local = sdata->local; 1078 int i; 1079 1080 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1081 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1082 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1083 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1084 sdata->vif.hw_queue[i] = i; 1085 else 1086 sdata->vif.hw_queue[i] = 0; 1087 } 1088 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1089 } 1090 1091 static void ieee80211_sdata_init(struct ieee80211_local *local, 1092 struct ieee80211_sub_if_data *sdata) 1093 { 1094 sdata->local = local; 1095 1096 /* 1097 * Initialize the default link, so we can use link_id 0 for non-MLD, 1098 * and that continues to work for non-MLD-aware drivers that use just 1099 * vif.bss_conf instead of vif.link_conf. 1100 * 1101 * Note that we never change this, so if link ID 0 isn't used in an 1102 * MLD connection, we get a separate allocation for it. 1103 */ 1104 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1105 } 1106 1107 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1108 { 1109 struct ieee80211_sub_if_data *sdata; 1110 int ret; 1111 1112 ASSERT_RTNL(); 1113 lockdep_assert_wiphy(local->hw.wiphy); 1114 1115 if (local->monitor_sdata) 1116 return 0; 1117 1118 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1119 if (!sdata) 1120 return -ENOMEM; 1121 1122 /* set up data */ 1123 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1124 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1125 wiphy_name(local->hw.wiphy)); 1126 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1127 sdata->wdev.wiphy = local->hw.wiphy; 1128 1129 ieee80211_sdata_init(local, sdata); 1130 1131 ieee80211_set_default_queues(sdata); 1132 1133 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1134 ret = drv_add_interface(local, sdata); 1135 if (WARN_ON(ret)) { 1136 /* ok .. stupid driver, it asked for this! */ 1137 kfree(sdata); 1138 return ret; 1139 } 1140 } 1141 1142 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1143 1144 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1145 if (ret) { 1146 kfree(sdata); 1147 return ret; 1148 } 1149 1150 mutex_lock(&local->iflist_mtx); 1151 rcu_assign_pointer(local->monitor_sdata, sdata); 1152 mutex_unlock(&local->iflist_mtx); 1153 1154 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1155 IEEE80211_CHANCTX_EXCLUSIVE); 1156 if (ret) { 1157 mutex_lock(&local->iflist_mtx); 1158 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1159 mutex_unlock(&local->iflist_mtx); 1160 synchronize_net(); 1161 drv_remove_interface(local, sdata); 1162 kfree(sdata); 1163 return ret; 1164 } 1165 1166 skb_queue_head_init(&sdata->skb_queue); 1167 skb_queue_head_init(&sdata->status_queue); 1168 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1169 1170 return 0; 1171 } 1172 1173 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1174 { 1175 struct ieee80211_sub_if_data *sdata; 1176 1177 ASSERT_RTNL(); 1178 lockdep_assert_wiphy(local->hw.wiphy); 1179 1180 mutex_lock(&local->iflist_mtx); 1181 1182 sdata = rcu_dereference_protected(local->monitor_sdata, 1183 lockdep_is_held(&local->iflist_mtx)); 1184 if (!sdata) { 1185 mutex_unlock(&local->iflist_mtx); 1186 return; 1187 } 1188 1189 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1190 mutex_unlock(&local->iflist_mtx); 1191 1192 synchronize_net(); 1193 1194 ieee80211_link_release_channel(&sdata->deflink); 1195 1196 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1197 drv_remove_interface(local, sdata); 1198 1199 kfree(sdata); 1200 } 1201 1202 /* 1203 * NOTE: Be very careful when changing this function, it must NOT return 1204 * an error on interface type changes that have been pre-checked, so most 1205 * checks should be in ieee80211_check_concurrent_iface. 1206 */ 1207 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1208 { 1209 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1210 struct net_device *dev = wdev->netdev; 1211 struct ieee80211_local *local = sdata->local; 1212 u64 changed = 0; 1213 int res; 1214 u32 hw_reconf_flags = 0; 1215 1216 lockdep_assert_wiphy(local->hw.wiphy); 1217 1218 switch (sdata->vif.type) { 1219 case NL80211_IFTYPE_AP_VLAN: { 1220 struct ieee80211_sub_if_data *master; 1221 1222 if (!sdata->bss) 1223 return -ENOLINK; 1224 1225 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1226 1227 master = container_of(sdata->bss, 1228 struct ieee80211_sub_if_data, u.ap); 1229 sdata->control_port_protocol = 1230 master->control_port_protocol; 1231 sdata->control_port_no_encrypt = 1232 master->control_port_no_encrypt; 1233 sdata->control_port_over_nl80211 = 1234 master->control_port_over_nl80211; 1235 sdata->control_port_no_preauth = 1236 master->control_port_no_preauth; 1237 sdata->vif.cab_queue = master->vif.cab_queue; 1238 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1239 sizeof(sdata->vif.hw_queue)); 1240 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1241 1242 sdata->crypto_tx_tailroom_needed_cnt += 1243 master->crypto_tx_tailroom_needed_cnt; 1244 1245 break; 1246 } 1247 case NL80211_IFTYPE_AP: 1248 sdata->bss = &sdata->u.ap; 1249 break; 1250 case NL80211_IFTYPE_MESH_POINT: 1251 case NL80211_IFTYPE_STATION: 1252 case NL80211_IFTYPE_MONITOR: 1253 case NL80211_IFTYPE_ADHOC: 1254 case NL80211_IFTYPE_P2P_DEVICE: 1255 case NL80211_IFTYPE_OCB: 1256 case NL80211_IFTYPE_NAN: 1257 /* no special treatment */ 1258 break; 1259 case NL80211_IFTYPE_UNSPECIFIED: 1260 case NUM_NL80211_IFTYPES: 1261 case NL80211_IFTYPE_P2P_CLIENT: 1262 case NL80211_IFTYPE_P2P_GO: 1263 case NL80211_IFTYPE_WDS: 1264 /* cannot happen */ 1265 WARN_ON(1); 1266 break; 1267 } 1268 1269 if (local->open_count == 0) { 1270 /* here we can consider everything in good order (again) */ 1271 local->reconfig_failure = false; 1272 1273 res = drv_start(local); 1274 if (res) 1275 goto err_del_bss; 1276 ieee80211_led_radio(local, true); 1277 ieee80211_mod_tpt_led_trig(local, 1278 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1279 } 1280 1281 /* 1282 * Copy the hopefully now-present MAC address to 1283 * this interface, if it has the special null one. 1284 */ 1285 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1286 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1287 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1288 1289 if (!is_valid_ether_addr(dev->dev_addr)) { 1290 res = -EADDRNOTAVAIL; 1291 goto err_stop; 1292 } 1293 } 1294 1295 switch (sdata->vif.type) { 1296 case NL80211_IFTYPE_AP_VLAN: 1297 /* no need to tell driver, but set carrier and chanctx */ 1298 if (sdata->bss->active) { 1299 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1300 netif_carrier_on(dev); 1301 ieee80211_set_vif_encap_ops(sdata); 1302 } else { 1303 netif_carrier_off(dev); 1304 } 1305 break; 1306 case NL80211_IFTYPE_MONITOR: 1307 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1308 local->cooked_mntrs++; 1309 break; 1310 } 1311 1312 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1313 res = drv_add_interface(local, sdata); 1314 if (res) 1315 goto err_stop; 1316 } else if (local->monitors == 0 && local->open_count == 0) { 1317 res = ieee80211_add_virtual_monitor(local); 1318 if (res) 1319 goto err_stop; 1320 } 1321 1322 /* must be before the call to ieee80211_configure_filter */ 1323 local->monitors++; 1324 if (local->monitors == 1) { 1325 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1326 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1327 } 1328 1329 ieee80211_adjust_monitor_flags(sdata, 1); 1330 ieee80211_configure_filter(local); 1331 ieee80211_recalc_offload(local); 1332 ieee80211_recalc_idle(local); 1333 1334 netif_carrier_on(dev); 1335 break; 1336 default: 1337 if (coming_up) { 1338 ieee80211_del_virtual_monitor(local); 1339 ieee80211_set_sdata_offload_flags(sdata); 1340 1341 res = drv_add_interface(local, sdata); 1342 if (res) 1343 goto err_stop; 1344 1345 ieee80211_set_vif_encap_ops(sdata); 1346 res = ieee80211_check_queues(sdata, 1347 ieee80211_vif_type_p2p(&sdata->vif)); 1348 if (res) 1349 goto err_del_interface; 1350 } 1351 1352 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1353 local->fif_pspoll++; 1354 local->fif_probe_req++; 1355 1356 ieee80211_configure_filter(local); 1357 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1358 local->fif_probe_req++; 1359 } 1360 1361 if (sdata->vif.probe_req_reg) 1362 drv_config_iface_filter(local, sdata, 1363 FIF_PROBE_REQ, 1364 FIF_PROBE_REQ); 1365 1366 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1367 sdata->vif.type != NL80211_IFTYPE_NAN) 1368 changed |= ieee80211_reset_erp_info(sdata); 1369 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1370 changed); 1371 1372 switch (sdata->vif.type) { 1373 case NL80211_IFTYPE_STATION: 1374 case NL80211_IFTYPE_ADHOC: 1375 case NL80211_IFTYPE_AP: 1376 case NL80211_IFTYPE_MESH_POINT: 1377 case NL80211_IFTYPE_OCB: 1378 netif_carrier_off(dev); 1379 break; 1380 case NL80211_IFTYPE_P2P_DEVICE: 1381 case NL80211_IFTYPE_NAN: 1382 break; 1383 default: 1384 /* not reached */ 1385 WARN_ON(1); 1386 } 1387 1388 /* 1389 * Set default queue parameters so drivers don't 1390 * need to initialise the hardware if the hardware 1391 * doesn't start up with sane defaults. 1392 * Enable QoS for anything but station interfaces. 1393 */ 1394 ieee80211_set_wmm_default(&sdata->deflink, true, 1395 sdata->vif.type != NL80211_IFTYPE_STATION); 1396 } 1397 1398 switch (sdata->vif.type) { 1399 case NL80211_IFTYPE_P2P_DEVICE: 1400 rcu_assign_pointer(local->p2p_sdata, sdata); 1401 break; 1402 case NL80211_IFTYPE_MONITOR: 1403 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1404 break; 1405 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1406 break; 1407 default: 1408 break; 1409 } 1410 1411 /* 1412 * set_multicast_list will be invoked by the networking core 1413 * which will check whether any increments here were done in 1414 * error and sync them down to the hardware as filter flags. 1415 */ 1416 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1417 atomic_inc(&local->iff_allmultis); 1418 1419 if (coming_up) 1420 local->open_count++; 1421 1422 if (local->open_count == 1) 1423 ieee80211_hw_conf_init(local); 1424 else if (hw_reconf_flags) 1425 ieee80211_hw_config(local, hw_reconf_flags); 1426 1427 ieee80211_recalc_ps(local); 1428 1429 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1430 1431 return 0; 1432 err_del_interface: 1433 drv_remove_interface(local, sdata); 1434 err_stop: 1435 if (!local->open_count) 1436 drv_stop(local, false); 1437 err_del_bss: 1438 sdata->bss = NULL; 1439 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1440 list_del(&sdata->u.vlan.list); 1441 /* might already be clear but that doesn't matter */ 1442 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1443 return res; 1444 } 1445 1446 static void ieee80211_if_setup(struct net_device *dev) 1447 { 1448 ether_setup(dev); 1449 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1450 dev->priv_flags |= IFF_NO_QUEUE; 1451 dev->netdev_ops = &ieee80211_dataif_ops; 1452 dev->needs_free_netdev = true; 1453 } 1454 1455 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1456 struct ieee80211_sub_if_data *sdata, 1457 struct sk_buff *skb) 1458 { 1459 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1460 1461 lockdep_assert_wiphy(local->hw.wiphy); 1462 1463 if (ieee80211_is_action(mgmt->frame_control) && 1464 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1465 struct sta_info *sta; 1466 int len = skb->len; 1467 1468 sta = sta_info_get_bss(sdata, mgmt->sa); 1469 if (sta) { 1470 switch (mgmt->u.action.u.addba_req.action_code) { 1471 case WLAN_ACTION_ADDBA_REQ: 1472 ieee80211_process_addba_request(local, sta, 1473 mgmt, len); 1474 break; 1475 case WLAN_ACTION_ADDBA_RESP: 1476 ieee80211_process_addba_resp(local, sta, 1477 mgmt, len); 1478 break; 1479 case WLAN_ACTION_DELBA: 1480 ieee80211_process_delba(sdata, sta, 1481 mgmt, len); 1482 break; 1483 default: 1484 WARN_ON(1); 1485 break; 1486 } 1487 } 1488 } else if (ieee80211_is_action(mgmt->frame_control) && 1489 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1490 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1491 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1492 struct ieee80211_rx_status *status; 1493 enum nl80211_band band; 1494 struct sta_info *sta; 1495 u8 opmode; 1496 1497 status = IEEE80211_SKB_RXCB(skb); 1498 band = status->band; 1499 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1500 1501 sta = sta_info_get_bss(sdata, mgmt->sa); 1502 1503 if (sta) 1504 ieee80211_vht_handle_opmode(sdata, 1505 &sta->deflink, 1506 opmode, band); 1507 1508 break; 1509 } 1510 case WLAN_VHT_ACTION_GROUPID_MGMT: 1511 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1512 mgmt); 1513 break; 1514 default: 1515 WARN_ON(1); 1516 break; 1517 } 1518 } else if (ieee80211_is_action(mgmt->frame_control) && 1519 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1520 switch (mgmt->u.action.u.s1g.action_code) { 1521 case WLAN_S1G_TWT_TEARDOWN: 1522 case WLAN_S1G_TWT_SETUP: 1523 ieee80211_s1g_rx_twt_action(sdata, skb); 1524 break; 1525 default: 1526 break; 1527 } 1528 } else if (ieee80211_is_action(mgmt->frame_control) && 1529 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1530 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1531 switch (mgmt->u.action.u.ttlm_req.action_code) { 1532 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1533 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1534 skb->len); 1535 break; 1536 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1537 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1538 skb->len); 1539 break; 1540 default: 1541 break; 1542 } 1543 } 1544 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1545 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1546 ieee80211_sta_rx_queued_ext(sdata, skb); 1547 else 1548 WARN_ON(1); 1549 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1550 struct ieee80211_hdr *hdr = (void *)mgmt; 1551 struct sta_info *sta; 1552 1553 /* 1554 * So the frame isn't mgmt, but frame_control 1555 * is at the right place anyway, of course, so 1556 * the if statement is correct. 1557 * 1558 * Warn if we have other data frame types here, 1559 * they must not get here. 1560 */ 1561 WARN_ON(hdr->frame_control & 1562 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1563 WARN_ON(!(hdr->seq_ctrl & 1564 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1565 /* 1566 * This was a fragment of a frame, received while 1567 * a block-ack session was active. That cannot be 1568 * right, so terminate the session. 1569 */ 1570 sta = sta_info_get_bss(sdata, mgmt->sa); 1571 if (sta) { 1572 u16 tid = ieee80211_get_tid(hdr); 1573 1574 __ieee80211_stop_rx_ba_session( 1575 sta, tid, WLAN_BACK_RECIPIENT, 1576 WLAN_REASON_QSTA_REQUIRE_SETUP, 1577 true); 1578 } 1579 } else switch (sdata->vif.type) { 1580 case NL80211_IFTYPE_STATION: 1581 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1582 break; 1583 case NL80211_IFTYPE_ADHOC: 1584 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1585 break; 1586 case NL80211_IFTYPE_MESH_POINT: 1587 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1588 break; 1589 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1590 break; 1591 default: 1592 WARN(1, "frame for unexpected interface type"); 1593 break; 1594 } 1595 } 1596 1597 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1598 struct sk_buff *skb) 1599 { 1600 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1601 1602 if (ieee80211_is_action(mgmt->frame_control) && 1603 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1604 switch (mgmt->u.action.u.s1g.action_code) { 1605 case WLAN_S1G_TWT_TEARDOWN: 1606 case WLAN_S1G_TWT_SETUP: 1607 ieee80211_s1g_status_twt_action(sdata, skb); 1608 break; 1609 default: 1610 break; 1611 } 1612 } 1613 } 1614 1615 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1616 { 1617 struct ieee80211_sub_if_data *sdata = 1618 container_of(work, struct ieee80211_sub_if_data, work); 1619 struct ieee80211_local *local = sdata->local; 1620 struct sk_buff *skb; 1621 1622 if (!ieee80211_sdata_running(sdata)) 1623 return; 1624 1625 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1626 return; 1627 1628 if (!ieee80211_can_run_worker(local)) 1629 return; 1630 1631 /* first process frames */ 1632 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1633 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1634 1635 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1636 ieee80211_process_tdls_channel_switch(sdata, skb); 1637 else 1638 ieee80211_iface_process_skb(local, sdata, skb); 1639 1640 kfree_skb(skb); 1641 kcov_remote_stop(); 1642 } 1643 1644 /* process status queue */ 1645 while ((skb = skb_dequeue(&sdata->status_queue))) { 1646 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1647 1648 ieee80211_iface_process_status(sdata, skb); 1649 kfree_skb(skb); 1650 1651 kcov_remote_stop(); 1652 } 1653 1654 /* then other type-dependent work */ 1655 switch (sdata->vif.type) { 1656 case NL80211_IFTYPE_STATION: 1657 ieee80211_sta_work(sdata); 1658 break; 1659 case NL80211_IFTYPE_ADHOC: 1660 ieee80211_ibss_work(sdata); 1661 break; 1662 case NL80211_IFTYPE_MESH_POINT: 1663 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1664 break; 1665 ieee80211_mesh_work(sdata); 1666 break; 1667 case NL80211_IFTYPE_OCB: 1668 ieee80211_ocb_work(sdata); 1669 break; 1670 default: 1671 break; 1672 } 1673 } 1674 1675 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1676 struct wiphy_work *work) 1677 { 1678 struct ieee80211_sub_if_data *sdata = 1679 container_of(work, struct ieee80211_sub_if_data, 1680 activate_links_work); 1681 struct ieee80211_local *local = wiphy_priv(wiphy); 1682 1683 if (local->in_reconfig) 1684 return; 1685 1686 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1687 sdata->desired_active_links = 0; 1688 } 1689 1690 /* 1691 * Helper function to initialise an interface to a specific type. 1692 */ 1693 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1694 enum nl80211_iftype type) 1695 { 1696 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1697 0xff, 0xff, 0xff}; 1698 1699 /* clear type-dependent unions */ 1700 memset(&sdata->u, 0, sizeof(sdata->u)); 1701 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1702 1703 /* and set some type-dependent values */ 1704 sdata->vif.type = type; 1705 sdata->vif.p2p = false; 1706 sdata->wdev.iftype = type; 1707 1708 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1709 sdata->control_port_no_encrypt = false; 1710 sdata->control_port_over_nl80211 = false; 1711 sdata->control_port_no_preauth = false; 1712 sdata->vif.cfg.idle = true; 1713 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1714 1715 sdata->noack_map = 0; 1716 1717 /* only monitor/p2p-device differ */ 1718 if (sdata->dev) { 1719 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1720 sdata->dev->type = ARPHRD_ETHER; 1721 } 1722 1723 skb_queue_head_init(&sdata->skb_queue); 1724 skb_queue_head_init(&sdata->status_queue); 1725 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1726 wiphy_work_init(&sdata->activate_links_work, 1727 ieee80211_activate_links_work); 1728 wiphy_delayed_work_init(&sdata->dfs_cac_timer_work, 1729 ieee80211_dfs_cac_timer_work); 1730 1731 switch (type) { 1732 case NL80211_IFTYPE_P2P_GO: 1733 type = NL80211_IFTYPE_AP; 1734 sdata->vif.type = type; 1735 sdata->vif.p2p = true; 1736 fallthrough; 1737 case NL80211_IFTYPE_AP: 1738 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1739 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1740 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1741 break; 1742 case NL80211_IFTYPE_P2P_CLIENT: 1743 type = NL80211_IFTYPE_STATION; 1744 sdata->vif.type = type; 1745 sdata->vif.p2p = true; 1746 fallthrough; 1747 case NL80211_IFTYPE_STATION: 1748 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1749 ieee80211_sta_setup_sdata(sdata); 1750 break; 1751 case NL80211_IFTYPE_OCB: 1752 sdata->vif.bss_conf.bssid = bssid_wildcard; 1753 ieee80211_ocb_setup_sdata(sdata); 1754 break; 1755 case NL80211_IFTYPE_ADHOC: 1756 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1757 ieee80211_ibss_setup_sdata(sdata); 1758 break; 1759 case NL80211_IFTYPE_MESH_POINT: 1760 if (ieee80211_vif_is_mesh(&sdata->vif)) 1761 ieee80211_mesh_init_sdata(sdata); 1762 break; 1763 case NL80211_IFTYPE_MONITOR: 1764 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1765 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1766 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1767 MONITOR_FLAG_OTHER_BSS; 1768 break; 1769 case NL80211_IFTYPE_NAN: 1770 idr_init(&sdata->u.nan.function_inst_ids); 1771 spin_lock_init(&sdata->u.nan.func_lock); 1772 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1773 break; 1774 case NL80211_IFTYPE_AP_VLAN: 1775 case NL80211_IFTYPE_P2P_DEVICE: 1776 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1777 break; 1778 case NL80211_IFTYPE_UNSPECIFIED: 1779 case NL80211_IFTYPE_WDS: 1780 case NUM_NL80211_IFTYPES: 1781 WARN_ON(1); 1782 break; 1783 } 1784 1785 /* need to do this after the switch so vif.type is correct */ 1786 ieee80211_link_setup(&sdata->deflink); 1787 1788 ieee80211_debugfs_recreate_netdev(sdata, false); 1789 } 1790 1791 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1792 enum nl80211_iftype type) 1793 { 1794 struct ieee80211_local *local = sdata->local; 1795 int ret, err; 1796 enum nl80211_iftype internal_type = type; 1797 bool p2p = false; 1798 1799 ASSERT_RTNL(); 1800 1801 if (!local->ops->change_interface) 1802 return -EBUSY; 1803 1804 /* for now, don't support changing while links exist */ 1805 if (ieee80211_vif_is_mld(&sdata->vif)) 1806 return -EBUSY; 1807 1808 switch (sdata->vif.type) { 1809 case NL80211_IFTYPE_AP: 1810 if (!list_empty(&sdata->u.ap.vlans)) 1811 return -EBUSY; 1812 break; 1813 case NL80211_IFTYPE_STATION: 1814 case NL80211_IFTYPE_ADHOC: 1815 case NL80211_IFTYPE_OCB: 1816 /* 1817 * Could maybe also all others here? 1818 * Just not sure how that interacts 1819 * with the RX/config path e.g. for 1820 * mesh. 1821 */ 1822 break; 1823 default: 1824 return -EBUSY; 1825 } 1826 1827 switch (type) { 1828 case NL80211_IFTYPE_AP: 1829 case NL80211_IFTYPE_STATION: 1830 case NL80211_IFTYPE_ADHOC: 1831 case NL80211_IFTYPE_OCB: 1832 /* 1833 * Could probably support everything 1834 * but here. 1835 */ 1836 break; 1837 case NL80211_IFTYPE_P2P_CLIENT: 1838 p2p = true; 1839 internal_type = NL80211_IFTYPE_STATION; 1840 break; 1841 case NL80211_IFTYPE_P2P_GO: 1842 p2p = true; 1843 internal_type = NL80211_IFTYPE_AP; 1844 break; 1845 default: 1846 return -EBUSY; 1847 } 1848 1849 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1850 if (ret) 1851 return ret; 1852 1853 ieee80211_stop_vif_queues(local, sdata, 1854 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1855 /* do_stop will synchronize_rcu() first thing */ 1856 ieee80211_do_stop(sdata, false); 1857 1858 ieee80211_teardown_sdata(sdata); 1859 1860 ieee80211_set_sdata_offload_flags(sdata); 1861 ret = drv_change_interface(local, sdata, internal_type, p2p); 1862 if (ret) 1863 type = ieee80211_vif_type_p2p(&sdata->vif); 1864 1865 /* 1866 * Ignore return value here, there's not much we can do since 1867 * the driver changed the interface type internally already. 1868 * The warnings will hopefully make driver authors fix it :-) 1869 */ 1870 ieee80211_check_queues(sdata, type); 1871 1872 ieee80211_setup_sdata(sdata, type); 1873 ieee80211_set_vif_encap_ops(sdata); 1874 1875 err = ieee80211_do_open(&sdata->wdev, false); 1876 WARN(err, "type change: do_open returned %d", err); 1877 1878 ieee80211_wake_vif_queues(local, sdata, 1879 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1880 return ret; 1881 } 1882 1883 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1884 enum nl80211_iftype type) 1885 { 1886 int ret; 1887 1888 ASSERT_RTNL(); 1889 1890 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1891 return 0; 1892 1893 if (ieee80211_sdata_running(sdata)) { 1894 ret = ieee80211_runtime_change_iftype(sdata, type); 1895 if (ret) 1896 return ret; 1897 } else { 1898 /* Purge and reset type-dependent state. */ 1899 ieee80211_teardown_sdata(sdata); 1900 ieee80211_setup_sdata(sdata, type); 1901 } 1902 1903 /* reset some values that shouldn't be kept across type changes */ 1904 if (type == NL80211_IFTYPE_STATION) 1905 sdata->u.mgd.use_4addr = false; 1906 1907 return 0; 1908 } 1909 1910 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1911 u8 *perm_addr, enum nl80211_iftype type) 1912 { 1913 struct ieee80211_sub_if_data *sdata; 1914 u64 mask, start, addr, val, inc; 1915 u8 *m; 1916 u8 tmp_addr[ETH_ALEN]; 1917 int i; 1918 1919 lockdep_assert_wiphy(local->hw.wiphy); 1920 1921 /* default ... something at least */ 1922 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1923 1924 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1925 local->hw.wiphy->n_addresses <= 1) 1926 return; 1927 1928 switch (type) { 1929 case NL80211_IFTYPE_MONITOR: 1930 /* doesn't matter */ 1931 break; 1932 case NL80211_IFTYPE_AP_VLAN: 1933 /* match up with an AP interface */ 1934 list_for_each_entry(sdata, &local->interfaces, list) { 1935 if (sdata->vif.type != NL80211_IFTYPE_AP) 1936 continue; 1937 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1938 break; 1939 } 1940 /* keep default if no AP interface present */ 1941 break; 1942 case NL80211_IFTYPE_P2P_CLIENT: 1943 case NL80211_IFTYPE_P2P_GO: 1944 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1945 list_for_each_entry(sdata, &local->interfaces, list) { 1946 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1947 continue; 1948 if (!ieee80211_sdata_running(sdata)) 1949 continue; 1950 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1951 return; 1952 } 1953 } 1954 fallthrough; 1955 default: 1956 /* assign a new address if possible -- try n_addresses first */ 1957 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1958 bool used = false; 1959 1960 list_for_each_entry(sdata, &local->interfaces, list) { 1961 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1962 sdata->vif.addr)) { 1963 used = true; 1964 break; 1965 } 1966 } 1967 1968 if (!used) { 1969 memcpy(perm_addr, 1970 local->hw.wiphy->addresses[i].addr, 1971 ETH_ALEN); 1972 break; 1973 } 1974 } 1975 1976 /* try mask if available */ 1977 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1978 break; 1979 1980 m = local->hw.wiphy->addr_mask; 1981 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1982 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1983 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1984 1985 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1986 /* not a contiguous mask ... not handled now! */ 1987 pr_info("not contiguous\n"); 1988 break; 1989 } 1990 1991 /* 1992 * Pick address of existing interface in case user changed 1993 * MAC address manually, default to perm_addr. 1994 */ 1995 m = local->hw.wiphy->perm_addr; 1996 list_for_each_entry(sdata, &local->interfaces, list) { 1997 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1998 continue; 1999 m = sdata->vif.addr; 2000 break; 2001 } 2002 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2003 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2004 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2005 2006 inc = 1ULL<<__ffs64(mask); 2007 val = (start & mask); 2008 addr = (start & ~mask) | (val & mask); 2009 do { 2010 bool used = false; 2011 2012 tmp_addr[5] = addr >> 0*8; 2013 tmp_addr[4] = addr >> 1*8; 2014 tmp_addr[3] = addr >> 2*8; 2015 tmp_addr[2] = addr >> 3*8; 2016 tmp_addr[1] = addr >> 4*8; 2017 tmp_addr[0] = addr >> 5*8; 2018 2019 val += inc; 2020 2021 list_for_each_entry(sdata, &local->interfaces, list) { 2022 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2023 used = true; 2024 break; 2025 } 2026 } 2027 2028 if (!used) { 2029 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2030 break; 2031 } 2032 addr = (start & ~mask) | (val & mask); 2033 } while (addr != start); 2034 2035 break; 2036 } 2037 } 2038 2039 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2040 unsigned char name_assign_type, 2041 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2042 struct vif_params *params) 2043 { 2044 struct net_device *ndev = NULL; 2045 struct ieee80211_sub_if_data *sdata = NULL; 2046 struct txq_info *txqi; 2047 int ret, i; 2048 2049 ASSERT_RTNL(); 2050 lockdep_assert_wiphy(local->hw.wiphy); 2051 2052 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2053 struct wireless_dev *wdev; 2054 2055 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2056 GFP_KERNEL); 2057 if (!sdata) 2058 return -ENOMEM; 2059 wdev = &sdata->wdev; 2060 2061 sdata->dev = NULL; 2062 strscpy(sdata->name, name, IFNAMSIZ); 2063 ieee80211_assign_perm_addr(local, wdev->address, type); 2064 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2065 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2066 } else { 2067 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2068 sizeof(void *)); 2069 int txq_size = 0; 2070 2071 if (type != NL80211_IFTYPE_AP_VLAN && 2072 (type != NL80211_IFTYPE_MONITOR || 2073 (params->flags & MONITOR_FLAG_ACTIVE))) 2074 txq_size += sizeof(struct txq_info) + 2075 local->hw.txq_data_size; 2076 2077 ndev = alloc_netdev_mqs(size + txq_size, 2078 name, name_assign_type, 2079 ieee80211_if_setup, 1, 1); 2080 if (!ndev) 2081 return -ENOMEM; 2082 2083 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2084 2085 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2086 2087 ndev->needed_headroom = local->tx_headroom + 2088 4*6 /* four MAC addresses */ 2089 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2090 + 6 /* mesh */ 2091 + 8 /* rfc1042/bridge tunnel */ 2092 - ETH_HLEN /* ethernet hard_header_len */ 2093 + IEEE80211_ENCRYPT_HEADROOM; 2094 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2095 2096 ret = dev_alloc_name(ndev, ndev->name); 2097 if (ret < 0) { 2098 free_netdev(ndev); 2099 return ret; 2100 } 2101 2102 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2103 if (is_valid_ether_addr(params->macaddr)) 2104 eth_hw_addr_set(ndev, params->macaddr); 2105 else 2106 eth_hw_addr_set(ndev, ndev->perm_addr); 2107 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2108 2109 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2110 sdata = netdev_priv(ndev); 2111 ndev->ieee80211_ptr = &sdata->wdev; 2112 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2113 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2114 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2115 2116 if (txq_size) { 2117 txqi = netdev_priv(ndev) + size; 2118 ieee80211_txq_init(sdata, NULL, txqi, 0); 2119 } 2120 2121 sdata->dev = ndev; 2122 } 2123 2124 /* initialise type-independent data */ 2125 sdata->wdev.wiphy = local->hw.wiphy; 2126 2127 ieee80211_sdata_init(local, sdata); 2128 2129 ieee80211_init_frag_cache(&sdata->frags); 2130 2131 INIT_LIST_HEAD(&sdata->key_list); 2132 2133 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2134 ieee80211_delayed_tailroom_dec); 2135 2136 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2137 struct ieee80211_supported_band *sband; 2138 sband = local->hw.wiphy->bands[i]; 2139 sdata->rc_rateidx_mask[i] = 2140 sband ? (1 << sband->n_bitrates) - 1 : 0; 2141 if (sband) { 2142 __le16 cap; 2143 u16 *vht_rate_mask; 2144 2145 memcpy(sdata->rc_rateidx_mcs_mask[i], 2146 sband->ht_cap.mcs.rx_mask, 2147 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2148 2149 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2150 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2151 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2152 } else { 2153 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2154 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2155 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2156 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2157 } 2158 } 2159 2160 ieee80211_set_default_queues(sdata); 2161 2162 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2163 sdata->deflink.user_power_level = local->user_power_level; 2164 2165 /* setup type-dependent data */ 2166 ieee80211_setup_sdata(sdata, type); 2167 2168 if (ndev) { 2169 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2170 if (type == NL80211_IFTYPE_STATION) 2171 sdata->u.mgd.use_4addr = params->use_4addr; 2172 2173 ndev->features |= local->hw.netdev_features; 2174 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2175 ndev->hw_features |= ndev->features & 2176 MAC80211_SUPPORTED_FEATURES_TX; 2177 sdata->vif.netdev_features = local->hw.netdev_features; 2178 2179 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2180 2181 /* MTU range is normally 256 - 2304, where the upper limit is 2182 * the maximum MSDU size. Monitor interfaces send and receive 2183 * MPDU and A-MSDU frames which may be much larger so we do 2184 * not impose an upper limit in that case. 2185 */ 2186 ndev->min_mtu = 256; 2187 if (type == NL80211_IFTYPE_MONITOR) 2188 ndev->max_mtu = 0; 2189 else 2190 ndev->max_mtu = local->hw.max_mtu; 2191 2192 ret = cfg80211_register_netdevice(ndev); 2193 if (ret) { 2194 free_netdev(ndev); 2195 return ret; 2196 } 2197 } 2198 2199 mutex_lock(&local->iflist_mtx); 2200 list_add_tail_rcu(&sdata->list, &local->interfaces); 2201 mutex_unlock(&local->iflist_mtx); 2202 2203 if (new_wdev) 2204 *new_wdev = &sdata->wdev; 2205 2206 return 0; 2207 } 2208 2209 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2210 { 2211 ASSERT_RTNL(); 2212 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2213 2214 mutex_lock(&sdata->local->iflist_mtx); 2215 list_del_rcu(&sdata->list); 2216 mutex_unlock(&sdata->local->iflist_mtx); 2217 2218 if (sdata->vif.txq) 2219 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2220 2221 synchronize_rcu(); 2222 2223 cfg80211_unregister_wdev(&sdata->wdev); 2224 2225 if (!sdata->dev) { 2226 ieee80211_teardown_sdata(sdata); 2227 kfree(sdata); 2228 } 2229 } 2230 2231 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2232 { 2233 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2234 return; 2235 ieee80211_do_stop(sdata, true); 2236 } 2237 2238 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2239 { 2240 struct ieee80211_sub_if_data *sdata, *tmp; 2241 LIST_HEAD(unreg_list); 2242 2243 ASSERT_RTNL(); 2244 2245 /* Before destroying the interfaces, make sure they're all stopped so 2246 * that the hardware is stopped. Otherwise, the driver might still be 2247 * iterating the interfaces during the shutdown, e.g. from a worker 2248 * or from RX processing or similar, and if it does so (using atomic 2249 * iteration) while we're manipulating the list, the iteration will 2250 * crash. 2251 * 2252 * After this, the hardware should be stopped and the driver should 2253 * have stopped all of its activities, so that we can do RCU-unaware 2254 * manipulations of the interface list below. 2255 */ 2256 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2257 2258 wiphy_lock(local->hw.wiphy); 2259 2260 WARN(local->open_count, "%s: open count remains %d\n", 2261 wiphy_name(local->hw.wiphy), local->open_count); 2262 2263 mutex_lock(&local->iflist_mtx); 2264 list_splice_init(&local->interfaces, &unreg_list); 2265 mutex_unlock(&local->iflist_mtx); 2266 2267 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2268 bool netdev = sdata->dev; 2269 2270 /* 2271 * Remove IP addresses explicitly, since the notifier will 2272 * skip the callbacks if wdev->registered is false, since 2273 * we can't acquire the wiphy_lock() again there if already 2274 * inside this locked section. 2275 */ 2276 sdata->vif.cfg.arp_addr_cnt = 0; 2277 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2278 sdata->u.mgd.associated) 2279 ieee80211_vif_cfg_change_notify(sdata, 2280 BSS_CHANGED_ARP_FILTER); 2281 2282 list_del(&sdata->list); 2283 cfg80211_unregister_wdev(&sdata->wdev); 2284 2285 if (!netdev) 2286 kfree(sdata); 2287 } 2288 wiphy_unlock(local->hw.wiphy); 2289 } 2290 2291 static int netdev_notify(struct notifier_block *nb, 2292 unsigned long state, void *ptr) 2293 { 2294 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2295 struct ieee80211_sub_if_data *sdata; 2296 2297 if (state != NETDEV_CHANGENAME) 2298 return NOTIFY_DONE; 2299 2300 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2301 return NOTIFY_DONE; 2302 2303 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2304 return NOTIFY_DONE; 2305 2306 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2307 memcpy(sdata->name, dev->name, IFNAMSIZ); 2308 ieee80211_debugfs_rename_netdev(sdata); 2309 2310 return NOTIFY_OK; 2311 } 2312 2313 static struct notifier_block mac80211_netdev_notifier = { 2314 .notifier_call = netdev_notify, 2315 }; 2316 2317 int ieee80211_iface_init(void) 2318 { 2319 return register_netdevice_notifier(&mac80211_netdev_notifier); 2320 } 2321 2322 void ieee80211_iface_exit(void) 2323 { 2324 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2325 } 2326 2327 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2328 { 2329 if (sdata->vif.type == NL80211_IFTYPE_AP) 2330 atomic_inc(&sdata->u.ap.num_mcast_sta); 2331 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2332 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2333 } 2334 2335 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2336 { 2337 if (sdata->vif.type == NL80211_IFTYPE_AP) 2338 atomic_dec(&sdata->u.ap.num_mcast_sta); 2339 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2340 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2341 } 2342 2343 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2344 { 2345 struct ieee80211_local *local = sdata->local; 2346 2347 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2348 return; 2349 2350 ieee80211_stop_vif_queues(local, sdata, 2351 IEEE80211_QUEUE_STOP_REASON_CSA); 2352 sdata->csa_blocked_queues = true; 2353 } 2354 2355 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2356 { 2357 struct ieee80211_local *local = sdata->local; 2358 2359 if (sdata->csa_blocked_queues) { 2360 ieee80211_wake_vif_queues(local, sdata, 2361 IEEE80211_QUEUE_STOP_REASON_CSA); 2362 sdata->csa_blocked_queues = false; 2363 } 2364 } 2365