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 if (sdata->csa_blocked_tx) { 548 ieee80211_wake_vif_queues(local, sdata, 549 IEEE80211_QUEUE_STOP_REASON_CSA); 550 sdata->csa_blocked_tx = false; 551 } 552 553 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa_finalize_work); 554 wiphy_work_cancel(local->hw.wiphy, 555 &sdata->deflink.color_change_finalize_work); 556 wiphy_delayed_work_cancel(local->hw.wiphy, 557 &sdata->deflink.dfs_cac_timer_work); 558 559 if (sdata->wdev.cac_started) { 560 chandef = sdata->vif.bss_conf.chanreq.oper; 561 WARN_ON(local->suspended); 562 ieee80211_link_release_channel(&sdata->deflink); 563 cfg80211_cac_event(sdata->dev, &chandef, 564 NL80211_RADAR_CAC_ABORTED, 565 GFP_KERNEL); 566 } 567 568 if (sdata->vif.type == NL80211_IFTYPE_AP) { 569 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 570 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 571 /* remove all packets in parent bc_buf pointing to this dev */ 572 ps = &sdata->bss->ps; 573 574 spin_lock_irqsave(&ps->bc_buf.lock, flags); 575 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 576 if (skb->dev == sdata->dev) { 577 __skb_unlink(skb, &ps->bc_buf); 578 local->total_ps_buffered--; 579 ieee80211_free_txskb(&local->hw, skb); 580 } 581 } 582 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 583 } 584 585 if (going_down) 586 local->open_count--; 587 588 switch (sdata->vif.type) { 589 case NL80211_IFTYPE_AP_VLAN: 590 list_del(&sdata->u.vlan.list); 591 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 592 /* see comment in the default case below */ 593 ieee80211_free_keys(sdata, true); 594 /* no need to tell driver */ 595 break; 596 case NL80211_IFTYPE_MONITOR: 597 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 598 local->cooked_mntrs--; 599 break; 600 } 601 602 local->monitors--; 603 if (local->monitors == 0) { 604 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 605 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 606 } 607 608 ieee80211_adjust_monitor_flags(sdata, -1); 609 break; 610 case NL80211_IFTYPE_NAN: 611 /* clean all the functions */ 612 spin_lock_bh(&sdata->u.nan.func_lock); 613 614 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 615 idr_remove(&sdata->u.nan.function_inst_ids, i); 616 cfg80211_free_nan_func(func); 617 } 618 idr_destroy(&sdata->u.nan.function_inst_ids); 619 620 spin_unlock_bh(&sdata->u.nan.func_lock); 621 break; 622 case NL80211_IFTYPE_P2P_DEVICE: 623 /* relies on synchronize_rcu() below */ 624 RCU_INIT_POINTER(local->p2p_sdata, NULL); 625 fallthrough; 626 default: 627 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 628 /* 629 * When we get here, the interface is marked down. 630 * Free the remaining keys, if there are any 631 * (which can happen in AP mode if userspace sets 632 * keys before the interface is operating) 633 * 634 * Force the key freeing to always synchronize_net() 635 * to wait for the RX path in case it is using this 636 * interface enqueuing frames at this very time on 637 * another CPU. 638 */ 639 ieee80211_free_keys(sdata, true); 640 skb_queue_purge(&sdata->skb_queue); 641 skb_queue_purge(&sdata->status_queue); 642 } 643 644 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 645 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 646 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 647 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 648 if (info->control.vif == &sdata->vif) { 649 __skb_unlink(skb, &local->pending[i]); 650 ieee80211_free_txskb(&local->hw, skb); 651 } 652 } 653 } 654 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 655 656 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 657 ieee80211_txq_remove_vlan(local, sdata); 658 659 sdata->bss = NULL; 660 661 if (local->open_count == 0) 662 ieee80211_clear_tx_pending(local); 663 664 sdata->vif.bss_conf.beacon_int = 0; 665 666 /* 667 * If the interface goes down while suspended, presumably because 668 * the device was unplugged and that happens before our resume, 669 * then the driver is already unconfigured and the remainder of 670 * this function isn't needed. 671 * XXX: what about WoWLAN? If the device has software state, e.g. 672 * memory allocated, it might expect teardown commands from 673 * mac80211 here? 674 */ 675 if (local->suspended) { 676 WARN_ON(local->wowlan); 677 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 678 return; 679 } 680 681 switch (sdata->vif.type) { 682 case NL80211_IFTYPE_AP_VLAN: 683 break; 684 case NL80211_IFTYPE_MONITOR: 685 if (local->monitors == 0) 686 ieee80211_del_virtual_monitor(local); 687 688 ieee80211_recalc_idle(local); 689 690 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 691 break; 692 693 fallthrough; 694 default: 695 if (going_down) 696 drv_remove_interface(local, sdata); 697 } 698 699 ieee80211_recalc_ps(local); 700 701 if (cancel_scan) 702 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 703 704 if (local->open_count == 0) { 705 ieee80211_stop_device(local); 706 707 /* no reconfiguring after stop! */ 708 return; 709 } 710 711 /* do after stop to avoid reconfiguring when we stop anyway */ 712 ieee80211_configure_filter(local); 713 ieee80211_hw_config(local, hw_reconf_flags); 714 715 if (local->monitors == local->open_count) 716 ieee80211_add_virtual_monitor(local); 717 } 718 719 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 720 { 721 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 722 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 723 724 if (!tx_vif) 725 return; 726 727 tx_sdata = vif_to_sdata(tx_vif); 728 sdata->vif.mbssid_tx_vif = NULL; 729 730 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 731 &tx_sdata->local->interfaces, list) { 732 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 733 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 734 ieee80211_sdata_running(non_tx_sdata)) { 735 non_tx_sdata->vif.mbssid_tx_vif = NULL; 736 dev_close(non_tx_sdata->wdev.netdev); 737 } 738 } 739 740 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 741 tx_sdata->vif.mbssid_tx_vif = NULL; 742 dev_close(tx_sdata->wdev.netdev); 743 } 744 } 745 746 static int ieee80211_stop(struct net_device *dev) 747 { 748 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 749 750 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 751 if (sdata->vif.type == NL80211_IFTYPE_AP) { 752 struct ieee80211_sub_if_data *vlan, *tmpsdata; 753 754 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 755 u.vlan.list) 756 dev_close(vlan->dev); 757 758 ieee80211_stop_mbssid(sdata); 759 } 760 761 wiphy_lock(sdata->local->hw.wiphy); 762 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 763 764 ieee80211_do_stop(sdata, true); 765 wiphy_unlock(sdata->local->hw.wiphy); 766 767 return 0; 768 } 769 770 static void ieee80211_set_multicast_list(struct net_device *dev) 771 { 772 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 773 struct ieee80211_local *local = sdata->local; 774 int allmulti, sdata_allmulti; 775 776 allmulti = !!(dev->flags & IFF_ALLMULTI); 777 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 778 779 if (allmulti != sdata_allmulti) { 780 if (dev->flags & IFF_ALLMULTI) 781 atomic_inc(&local->iff_allmultis); 782 else 783 atomic_dec(&local->iff_allmultis); 784 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 785 } 786 787 spin_lock_bh(&local->filter_lock); 788 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 789 spin_unlock_bh(&local->filter_lock); 790 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 791 } 792 793 /* 794 * Called when the netdev is removed or, by the code below, before 795 * the interface type changes. 796 */ 797 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 798 { 799 /* free extra data */ 800 ieee80211_free_keys(sdata, false); 801 802 ieee80211_debugfs_remove_netdev(sdata); 803 804 ieee80211_destroy_frag_cache(&sdata->frags); 805 806 if (ieee80211_vif_is_mesh(&sdata->vif)) 807 ieee80211_mesh_teardown_sdata(sdata); 808 809 ieee80211_vif_clear_links(sdata); 810 ieee80211_link_stop(&sdata->deflink); 811 } 812 813 static void ieee80211_uninit(struct net_device *dev) 814 { 815 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 816 } 817 818 static void 819 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 820 { 821 dev_fetch_sw_netstats(stats, dev->tstats); 822 } 823 824 static int ieee80211_netdev_setup_tc(struct net_device *dev, 825 enum tc_setup_type type, void *type_data) 826 { 827 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 828 struct ieee80211_local *local = sdata->local; 829 830 return drv_net_setup_tc(local, sdata, dev, type, type_data); 831 } 832 833 static const struct net_device_ops ieee80211_dataif_ops = { 834 .ndo_open = ieee80211_open, 835 .ndo_stop = ieee80211_stop, 836 .ndo_uninit = ieee80211_uninit, 837 .ndo_start_xmit = ieee80211_subif_start_xmit, 838 .ndo_set_rx_mode = ieee80211_set_multicast_list, 839 .ndo_set_mac_address = ieee80211_change_mac, 840 .ndo_get_stats64 = ieee80211_get_stats64, 841 .ndo_setup_tc = ieee80211_netdev_setup_tc, 842 }; 843 844 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 845 struct sk_buff *skb, 846 struct net_device *sb_dev) 847 { 848 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 849 struct ieee80211_local *local = sdata->local; 850 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 851 struct ieee80211_hdr *hdr; 852 int len_rthdr; 853 854 if (local->hw.queues < IEEE80211_NUM_ACS) 855 return 0; 856 857 /* reset flags and info before parsing radiotap header */ 858 memset(info, 0, sizeof(*info)); 859 860 if (!ieee80211_parse_tx_radiotap(skb, dev)) 861 return 0; /* doesn't matter, frame will be dropped */ 862 863 len_rthdr = ieee80211_get_radiotap_len(skb->data); 864 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 865 if (skb->len < len_rthdr + 2 || 866 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 867 return 0; /* doesn't matter, frame will be dropped */ 868 869 return ieee80211_select_queue_80211(sdata, skb, hdr); 870 } 871 872 static const struct net_device_ops ieee80211_monitorif_ops = { 873 .ndo_open = ieee80211_open, 874 .ndo_stop = ieee80211_stop, 875 .ndo_uninit = ieee80211_uninit, 876 .ndo_start_xmit = ieee80211_monitor_start_xmit, 877 .ndo_set_rx_mode = ieee80211_set_multicast_list, 878 .ndo_set_mac_address = ieee80211_change_mac, 879 .ndo_select_queue = ieee80211_monitor_select_queue, 880 .ndo_get_stats64 = ieee80211_get_stats64, 881 }; 882 883 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 884 struct net_device_path *path) 885 { 886 struct ieee80211_sub_if_data *sdata; 887 struct ieee80211_local *local; 888 struct sta_info *sta; 889 int ret = -ENOENT; 890 891 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 892 local = sdata->local; 893 894 if (!local->ops->net_fill_forward_path) 895 return -EOPNOTSUPP; 896 897 rcu_read_lock(); 898 switch (sdata->vif.type) { 899 case NL80211_IFTYPE_AP_VLAN: 900 sta = rcu_dereference(sdata->u.vlan.sta); 901 if (sta) 902 break; 903 if (sdata->wdev.use_4addr) 904 goto out; 905 if (is_multicast_ether_addr(ctx->daddr)) 906 goto out; 907 sta = sta_info_get_bss(sdata, ctx->daddr); 908 break; 909 case NL80211_IFTYPE_AP: 910 if (is_multicast_ether_addr(ctx->daddr)) 911 goto out; 912 sta = sta_info_get(sdata, ctx->daddr); 913 break; 914 case NL80211_IFTYPE_STATION: 915 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 916 sta = sta_info_get(sdata, ctx->daddr); 917 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 918 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 919 goto out; 920 921 break; 922 } 923 } 924 925 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 926 break; 927 default: 928 goto out; 929 } 930 931 if (!sta) 932 goto out; 933 934 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 935 out: 936 rcu_read_unlock(); 937 938 return ret; 939 } 940 941 static const struct net_device_ops ieee80211_dataif_8023_ops = { 942 .ndo_open = ieee80211_open, 943 .ndo_stop = ieee80211_stop, 944 .ndo_uninit = ieee80211_uninit, 945 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 946 .ndo_set_rx_mode = ieee80211_set_multicast_list, 947 .ndo_set_mac_address = ieee80211_change_mac, 948 .ndo_get_stats64 = ieee80211_get_stats64, 949 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 950 .ndo_setup_tc = ieee80211_netdev_setup_tc, 951 }; 952 953 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 954 { 955 switch (iftype) { 956 /* P2P GO and client are mapped to AP/STATION types */ 957 case NL80211_IFTYPE_AP: 958 case NL80211_IFTYPE_STATION: 959 return true; 960 default: 961 return false; 962 } 963 } 964 965 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 966 { 967 struct ieee80211_local *local = sdata->local; 968 u32 flags; 969 970 flags = sdata->vif.offload_flags; 971 972 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 973 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 974 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 975 976 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 977 local->hw.wiphy->frag_threshold != (u32)-1) 978 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 979 980 if (local->monitors) 981 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 982 } else { 983 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 984 } 985 986 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 987 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 988 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 989 990 if (local->monitors && 991 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 992 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 993 } else { 994 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 995 } 996 997 if (sdata->vif.offload_flags == flags) 998 return false; 999 1000 sdata->vif.offload_flags = flags; 1001 ieee80211_check_fast_rx_iface(sdata); 1002 return true; 1003 } 1004 1005 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1006 { 1007 struct ieee80211_local *local = sdata->local; 1008 struct ieee80211_sub_if_data *bss = sdata; 1009 bool enabled; 1010 1011 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1012 if (!sdata->bss) 1013 return; 1014 1015 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1016 } 1017 1018 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1019 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1020 return; 1021 1022 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1023 if (sdata->wdev.use_4addr && 1024 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1025 enabled = false; 1026 1027 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1028 &ieee80211_dataif_ops; 1029 } 1030 1031 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1032 { 1033 struct ieee80211_local *local = sdata->local; 1034 struct ieee80211_sub_if_data *vsdata; 1035 1036 if (ieee80211_set_sdata_offload_flags(sdata)) { 1037 drv_update_vif_offload(local, sdata); 1038 ieee80211_set_vif_encap_ops(sdata); 1039 } 1040 1041 list_for_each_entry(vsdata, &local->interfaces, list) { 1042 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1043 vsdata->bss != &sdata->u.ap) 1044 continue; 1045 1046 ieee80211_set_vif_encap_ops(vsdata); 1047 } 1048 } 1049 1050 void ieee80211_recalc_offload(struct ieee80211_local *local) 1051 { 1052 struct ieee80211_sub_if_data *sdata; 1053 1054 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1055 return; 1056 1057 lockdep_assert_wiphy(local->hw.wiphy); 1058 1059 list_for_each_entry(sdata, &local->interfaces, list) { 1060 if (!ieee80211_sdata_running(sdata)) 1061 continue; 1062 1063 ieee80211_recalc_sdata_offload(sdata); 1064 } 1065 } 1066 1067 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1068 const int offset) 1069 { 1070 struct ieee80211_local *local = sdata->local; 1071 u32 flags = sdata->u.mntr.flags; 1072 1073 #define ADJUST(_f, _s) do { \ 1074 if (flags & MONITOR_FLAG_##_f) \ 1075 local->fif_##_s += offset; \ 1076 } while (0) 1077 1078 ADJUST(FCSFAIL, fcsfail); 1079 ADJUST(PLCPFAIL, plcpfail); 1080 ADJUST(CONTROL, control); 1081 ADJUST(CONTROL, pspoll); 1082 ADJUST(OTHER_BSS, other_bss); 1083 1084 #undef ADJUST 1085 } 1086 1087 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1088 { 1089 struct ieee80211_local *local = sdata->local; 1090 int i; 1091 1092 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1093 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1094 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1095 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1096 sdata->vif.hw_queue[i] = i; 1097 else 1098 sdata->vif.hw_queue[i] = 0; 1099 } 1100 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1101 } 1102 1103 static void ieee80211_sdata_init(struct ieee80211_local *local, 1104 struct ieee80211_sub_if_data *sdata) 1105 { 1106 sdata->local = local; 1107 1108 /* 1109 * Initialize the default link, so we can use link_id 0 for non-MLD, 1110 * and that continues to work for non-MLD-aware drivers that use just 1111 * vif.bss_conf instead of vif.link_conf. 1112 * 1113 * Note that we never change this, so if link ID 0 isn't used in an 1114 * MLD connection, we get a separate allocation for it. 1115 */ 1116 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1117 } 1118 1119 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1120 { 1121 struct ieee80211_sub_if_data *sdata; 1122 int ret; 1123 1124 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1125 return 0; 1126 1127 ASSERT_RTNL(); 1128 lockdep_assert_wiphy(local->hw.wiphy); 1129 1130 if (local->monitor_sdata) 1131 return 0; 1132 1133 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1134 if (!sdata) 1135 return -ENOMEM; 1136 1137 /* set up data */ 1138 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1139 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1140 wiphy_name(local->hw.wiphy)); 1141 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1142 sdata->wdev.wiphy = local->hw.wiphy; 1143 1144 ieee80211_sdata_init(local, sdata); 1145 1146 ieee80211_set_default_queues(sdata); 1147 1148 ret = drv_add_interface(local, sdata); 1149 if (WARN_ON(ret)) { 1150 /* ok .. stupid driver, it asked for this! */ 1151 kfree(sdata); 1152 return ret; 1153 } 1154 1155 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1156 1157 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1158 if (ret) { 1159 kfree(sdata); 1160 return ret; 1161 } 1162 1163 mutex_lock(&local->iflist_mtx); 1164 rcu_assign_pointer(local->monitor_sdata, sdata); 1165 mutex_unlock(&local->iflist_mtx); 1166 1167 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1168 IEEE80211_CHANCTX_EXCLUSIVE); 1169 if (ret) { 1170 mutex_lock(&local->iflist_mtx); 1171 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1172 mutex_unlock(&local->iflist_mtx); 1173 synchronize_net(); 1174 drv_remove_interface(local, sdata); 1175 kfree(sdata); 1176 return ret; 1177 } 1178 1179 skb_queue_head_init(&sdata->skb_queue); 1180 skb_queue_head_init(&sdata->status_queue); 1181 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1182 1183 return 0; 1184 } 1185 1186 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1187 { 1188 struct ieee80211_sub_if_data *sdata; 1189 1190 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1191 return; 1192 1193 ASSERT_RTNL(); 1194 lockdep_assert_wiphy(local->hw.wiphy); 1195 1196 mutex_lock(&local->iflist_mtx); 1197 1198 sdata = rcu_dereference_protected(local->monitor_sdata, 1199 lockdep_is_held(&local->iflist_mtx)); 1200 if (!sdata) { 1201 mutex_unlock(&local->iflist_mtx); 1202 return; 1203 } 1204 1205 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1206 mutex_unlock(&local->iflist_mtx); 1207 1208 synchronize_net(); 1209 1210 ieee80211_link_release_channel(&sdata->deflink); 1211 1212 drv_remove_interface(local, sdata); 1213 1214 kfree(sdata); 1215 } 1216 1217 /* 1218 * NOTE: Be very careful when changing this function, it must NOT return 1219 * an error on interface type changes that have been pre-checked, so most 1220 * checks should be in ieee80211_check_concurrent_iface. 1221 */ 1222 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1223 { 1224 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1225 struct net_device *dev = wdev->netdev; 1226 struct ieee80211_local *local = sdata->local; 1227 u64 changed = 0; 1228 int res; 1229 u32 hw_reconf_flags = 0; 1230 1231 lockdep_assert_wiphy(local->hw.wiphy); 1232 1233 switch (sdata->vif.type) { 1234 case NL80211_IFTYPE_AP_VLAN: { 1235 struct ieee80211_sub_if_data *master; 1236 1237 if (!sdata->bss) 1238 return -ENOLINK; 1239 1240 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1241 1242 master = container_of(sdata->bss, 1243 struct ieee80211_sub_if_data, u.ap); 1244 sdata->control_port_protocol = 1245 master->control_port_protocol; 1246 sdata->control_port_no_encrypt = 1247 master->control_port_no_encrypt; 1248 sdata->control_port_over_nl80211 = 1249 master->control_port_over_nl80211; 1250 sdata->control_port_no_preauth = 1251 master->control_port_no_preauth; 1252 sdata->vif.cab_queue = master->vif.cab_queue; 1253 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1254 sizeof(sdata->vif.hw_queue)); 1255 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1256 1257 sdata->crypto_tx_tailroom_needed_cnt += 1258 master->crypto_tx_tailroom_needed_cnt; 1259 1260 break; 1261 } 1262 case NL80211_IFTYPE_AP: 1263 sdata->bss = &sdata->u.ap; 1264 break; 1265 case NL80211_IFTYPE_MESH_POINT: 1266 case NL80211_IFTYPE_STATION: 1267 case NL80211_IFTYPE_MONITOR: 1268 case NL80211_IFTYPE_ADHOC: 1269 case NL80211_IFTYPE_P2P_DEVICE: 1270 case NL80211_IFTYPE_OCB: 1271 case NL80211_IFTYPE_NAN: 1272 /* no special treatment */ 1273 break; 1274 case NL80211_IFTYPE_UNSPECIFIED: 1275 case NUM_NL80211_IFTYPES: 1276 case NL80211_IFTYPE_P2P_CLIENT: 1277 case NL80211_IFTYPE_P2P_GO: 1278 case NL80211_IFTYPE_WDS: 1279 /* cannot happen */ 1280 WARN_ON(1); 1281 break; 1282 } 1283 1284 if (local->open_count == 0) { 1285 /* here we can consider everything in good order (again) */ 1286 local->reconfig_failure = false; 1287 1288 res = drv_start(local); 1289 if (res) 1290 goto err_del_bss; 1291 ieee80211_led_radio(local, true); 1292 ieee80211_mod_tpt_led_trig(local, 1293 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1294 } 1295 1296 /* 1297 * Copy the hopefully now-present MAC address to 1298 * this interface, if it has the special null one. 1299 */ 1300 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1301 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1302 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1303 1304 if (!is_valid_ether_addr(dev->dev_addr)) { 1305 res = -EADDRNOTAVAIL; 1306 goto err_stop; 1307 } 1308 } 1309 1310 switch (sdata->vif.type) { 1311 case NL80211_IFTYPE_AP_VLAN: 1312 /* no need to tell driver, but set carrier and chanctx */ 1313 if (sdata->bss->active) { 1314 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1315 netif_carrier_on(dev); 1316 ieee80211_set_vif_encap_ops(sdata); 1317 } else { 1318 netif_carrier_off(dev); 1319 } 1320 break; 1321 case NL80211_IFTYPE_MONITOR: 1322 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1323 local->cooked_mntrs++; 1324 break; 1325 } 1326 1327 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1328 res = drv_add_interface(local, sdata); 1329 if (res) 1330 goto err_stop; 1331 } else if (local->monitors == 0 && local->open_count == 0) { 1332 res = ieee80211_add_virtual_monitor(local); 1333 if (res) 1334 goto err_stop; 1335 } 1336 1337 /* must be before the call to ieee80211_configure_filter */ 1338 local->monitors++; 1339 if (local->monitors == 1) { 1340 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1341 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1342 } 1343 1344 ieee80211_adjust_monitor_flags(sdata, 1); 1345 ieee80211_configure_filter(local); 1346 ieee80211_recalc_offload(local); 1347 ieee80211_recalc_idle(local); 1348 1349 netif_carrier_on(dev); 1350 break; 1351 default: 1352 if (coming_up) { 1353 ieee80211_del_virtual_monitor(local); 1354 ieee80211_set_sdata_offload_flags(sdata); 1355 1356 res = drv_add_interface(local, sdata); 1357 if (res) 1358 goto err_stop; 1359 1360 ieee80211_set_vif_encap_ops(sdata); 1361 res = ieee80211_check_queues(sdata, 1362 ieee80211_vif_type_p2p(&sdata->vif)); 1363 if (res) 1364 goto err_del_interface; 1365 } 1366 1367 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1368 local->fif_pspoll++; 1369 local->fif_probe_req++; 1370 1371 ieee80211_configure_filter(local); 1372 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1373 local->fif_probe_req++; 1374 } 1375 1376 if (sdata->vif.probe_req_reg) 1377 drv_config_iface_filter(local, sdata, 1378 FIF_PROBE_REQ, 1379 FIF_PROBE_REQ); 1380 1381 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1382 sdata->vif.type != NL80211_IFTYPE_NAN) 1383 changed |= ieee80211_reset_erp_info(sdata); 1384 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1385 changed); 1386 1387 switch (sdata->vif.type) { 1388 case NL80211_IFTYPE_STATION: 1389 case NL80211_IFTYPE_ADHOC: 1390 case NL80211_IFTYPE_AP: 1391 case NL80211_IFTYPE_MESH_POINT: 1392 case NL80211_IFTYPE_OCB: 1393 netif_carrier_off(dev); 1394 break; 1395 case NL80211_IFTYPE_P2P_DEVICE: 1396 case NL80211_IFTYPE_NAN: 1397 break; 1398 default: 1399 /* not reached */ 1400 WARN_ON(1); 1401 } 1402 1403 /* 1404 * Set default queue parameters so drivers don't 1405 * need to initialise the hardware if the hardware 1406 * doesn't start up with sane defaults. 1407 * Enable QoS for anything but station interfaces. 1408 */ 1409 ieee80211_set_wmm_default(&sdata->deflink, true, 1410 sdata->vif.type != NL80211_IFTYPE_STATION); 1411 } 1412 1413 switch (sdata->vif.type) { 1414 case NL80211_IFTYPE_P2P_DEVICE: 1415 rcu_assign_pointer(local->p2p_sdata, sdata); 1416 break; 1417 case NL80211_IFTYPE_MONITOR: 1418 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1419 break; 1420 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1421 break; 1422 default: 1423 break; 1424 } 1425 1426 /* 1427 * set_multicast_list will be invoked by the networking core 1428 * which will check whether any increments here were done in 1429 * error and sync them down to the hardware as filter flags. 1430 */ 1431 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1432 atomic_inc(&local->iff_allmultis); 1433 1434 if (coming_up) 1435 local->open_count++; 1436 1437 if (local->open_count == 1) 1438 ieee80211_hw_conf_init(local); 1439 else if (hw_reconf_flags) 1440 ieee80211_hw_config(local, hw_reconf_flags); 1441 1442 ieee80211_recalc_ps(local); 1443 1444 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1445 1446 return 0; 1447 err_del_interface: 1448 drv_remove_interface(local, sdata); 1449 err_stop: 1450 if (!local->open_count) 1451 drv_stop(local); 1452 err_del_bss: 1453 sdata->bss = NULL; 1454 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1455 list_del(&sdata->u.vlan.list); 1456 /* might already be clear but that doesn't matter */ 1457 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1458 return res; 1459 } 1460 1461 static void ieee80211_if_free(struct net_device *dev) 1462 { 1463 free_percpu(dev->tstats); 1464 } 1465 1466 static void ieee80211_if_setup(struct net_device *dev) 1467 { 1468 ether_setup(dev); 1469 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1470 dev->priv_flags |= IFF_NO_QUEUE; 1471 dev->netdev_ops = &ieee80211_dataif_ops; 1472 dev->needs_free_netdev = true; 1473 dev->priv_destructor = ieee80211_if_free; 1474 } 1475 1476 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1477 struct ieee80211_sub_if_data *sdata, 1478 struct sk_buff *skb) 1479 { 1480 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1481 1482 lockdep_assert_wiphy(local->hw.wiphy); 1483 1484 if (ieee80211_is_action(mgmt->frame_control) && 1485 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1486 struct sta_info *sta; 1487 int len = skb->len; 1488 1489 sta = sta_info_get_bss(sdata, mgmt->sa); 1490 if (sta) { 1491 switch (mgmt->u.action.u.addba_req.action_code) { 1492 case WLAN_ACTION_ADDBA_REQ: 1493 ieee80211_process_addba_request(local, sta, 1494 mgmt, len); 1495 break; 1496 case WLAN_ACTION_ADDBA_RESP: 1497 ieee80211_process_addba_resp(local, sta, 1498 mgmt, len); 1499 break; 1500 case WLAN_ACTION_DELBA: 1501 ieee80211_process_delba(sdata, sta, 1502 mgmt, len); 1503 break; 1504 default: 1505 WARN_ON(1); 1506 break; 1507 } 1508 } 1509 } else if (ieee80211_is_action(mgmt->frame_control) && 1510 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1511 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1512 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1513 struct ieee80211_rx_status *status; 1514 enum nl80211_band band; 1515 struct sta_info *sta; 1516 u8 opmode; 1517 1518 status = IEEE80211_SKB_RXCB(skb); 1519 band = status->band; 1520 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1521 1522 sta = sta_info_get_bss(sdata, mgmt->sa); 1523 1524 if (sta) 1525 ieee80211_vht_handle_opmode(sdata, 1526 &sta->deflink, 1527 opmode, band); 1528 1529 break; 1530 } 1531 case WLAN_VHT_ACTION_GROUPID_MGMT: 1532 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1533 mgmt); 1534 break; 1535 default: 1536 WARN_ON(1); 1537 break; 1538 } 1539 } else if (ieee80211_is_action(mgmt->frame_control) && 1540 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1541 switch (mgmt->u.action.u.s1g.action_code) { 1542 case WLAN_S1G_TWT_TEARDOWN: 1543 case WLAN_S1G_TWT_SETUP: 1544 ieee80211_s1g_rx_twt_action(sdata, skb); 1545 break; 1546 default: 1547 break; 1548 } 1549 } else if (ieee80211_is_action(mgmt->frame_control) && 1550 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1551 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1552 switch (mgmt->u.action.u.ttlm_req.action_code) { 1553 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1554 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1555 skb->len); 1556 break; 1557 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1558 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1559 skb->len); 1560 break; 1561 default: 1562 break; 1563 } 1564 } 1565 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1566 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1567 ieee80211_sta_rx_queued_ext(sdata, skb); 1568 else 1569 WARN_ON(1); 1570 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1571 struct ieee80211_hdr *hdr = (void *)mgmt; 1572 struct sta_info *sta; 1573 1574 /* 1575 * So the frame isn't mgmt, but frame_control 1576 * is at the right place anyway, of course, so 1577 * the if statement is correct. 1578 * 1579 * Warn if we have other data frame types here, 1580 * they must not get here. 1581 */ 1582 WARN_ON(hdr->frame_control & 1583 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1584 WARN_ON(!(hdr->seq_ctrl & 1585 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1586 /* 1587 * This was a fragment of a frame, received while 1588 * a block-ack session was active. That cannot be 1589 * right, so terminate the session. 1590 */ 1591 sta = sta_info_get_bss(sdata, mgmt->sa); 1592 if (sta) { 1593 u16 tid = ieee80211_get_tid(hdr); 1594 1595 __ieee80211_stop_rx_ba_session( 1596 sta, tid, WLAN_BACK_RECIPIENT, 1597 WLAN_REASON_QSTA_REQUIRE_SETUP, 1598 true); 1599 } 1600 } else switch (sdata->vif.type) { 1601 case NL80211_IFTYPE_STATION: 1602 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1603 break; 1604 case NL80211_IFTYPE_ADHOC: 1605 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1606 break; 1607 case NL80211_IFTYPE_MESH_POINT: 1608 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1609 break; 1610 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1611 break; 1612 default: 1613 WARN(1, "frame for unexpected interface type"); 1614 break; 1615 } 1616 } 1617 1618 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1619 struct sk_buff *skb) 1620 { 1621 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1622 1623 if (ieee80211_is_action(mgmt->frame_control) && 1624 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1625 switch (mgmt->u.action.u.s1g.action_code) { 1626 case WLAN_S1G_TWT_TEARDOWN: 1627 case WLAN_S1G_TWT_SETUP: 1628 ieee80211_s1g_status_twt_action(sdata, skb); 1629 break; 1630 default: 1631 break; 1632 } 1633 } 1634 } 1635 1636 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1637 { 1638 struct ieee80211_sub_if_data *sdata = 1639 container_of(work, struct ieee80211_sub_if_data, work); 1640 struct ieee80211_local *local = sdata->local; 1641 struct sk_buff *skb; 1642 1643 if (!ieee80211_sdata_running(sdata)) 1644 return; 1645 1646 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1647 return; 1648 1649 if (!ieee80211_can_run_worker(local)) 1650 return; 1651 1652 /* first process frames */ 1653 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1654 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1655 1656 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1657 ieee80211_process_tdls_channel_switch(sdata, skb); 1658 else 1659 ieee80211_iface_process_skb(local, sdata, skb); 1660 1661 kfree_skb(skb); 1662 kcov_remote_stop(); 1663 } 1664 1665 /* process status queue */ 1666 while ((skb = skb_dequeue(&sdata->status_queue))) { 1667 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1668 1669 ieee80211_iface_process_status(sdata, skb); 1670 kfree_skb(skb); 1671 1672 kcov_remote_stop(); 1673 } 1674 1675 /* then other type-dependent work */ 1676 switch (sdata->vif.type) { 1677 case NL80211_IFTYPE_STATION: 1678 ieee80211_sta_work(sdata); 1679 break; 1680 case NL80211_IFTYPE_ADHOC: 1681 ieee80211_ibss_work(sdata); 1682 break; 1683 case NL80211_IFTYPE_MESH_POINT: 1684 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1685 break; 1686 ieee80211_mesh_work(sdata); 1687 break; 1688 case NL80211_IFTYPE_OCB: 1689 ieee80211_ocb_work(sdata); 1690 break; 1691 default: 1692 break; 1693 } 1694 } 1695 1696 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1697 struct wiphy_work *work) 1698 { 1699 struct ieee80211_sub_if_data *sdata = 1700 container_of(work, struct ieee80211_sub_if_data, 1701 activate_links_work); 1702 1703 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1704 } 1705 1706 /* 1707 * Helper function to initialise an interface to a specific type. 1708 */ 1709 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1710 enum nl80211_iftype type) 1711 { 1712 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1713 0xff, 0xff, 0xff}; 1714 1715 /* clear type-dependent unions */ 1716 memset(&sdata->u, 0, sizeof(sdata->u)); 1717 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1718 1719 /* and set some type-dependent values */ 1720 sdata->vif.type = type; 1721 sdata->vif.p2p = false; 1722 sdata->wdev.iftype = type; 1723 1724 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1725 sdata->control_port_no_encrypt = false; 1726 sdata->control_port_over_nl80211 = false; 1727 sdata->control_port_no_preauth = false; 1728 sdata->vif.cfg.idle = true; 1729 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1730 1731 sdata->noack_map = 0; 1732 1733 /* only monitor/p2p-device differ */ 1734 if (sdata->dev) { 1735 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1736 sdata->dev->type = ARPHRD_ETHER; 1737 } 1738 1739 skb_queue_head_init(&sdata->skb_queue); 1740 skb_queue_head_init(&sdata->status_queue); 1741 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1742 wiphy_work_init(&sdata->activate_links_work, 1743 ieee80211_activate_links_work); 1744 1745 switch (type) { 1746 case NL80211_IFTYPE_P2P_GO: 1747 type = NL80211_IFTYPE_AP; 1748 sdata->vif.type = type; 1749 sdata->vif.p2p = true; 1750 fallthrough; 1751 case NL80211_IFTYPE_AP: 1752 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1753 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1754 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1755 break; 1756 case NL80211_IFTYPE_P2P_CLIENT: 1757 type = NL80211_IFTYPE_STATION; 1758 sdata->vif.type = type; 1759 sdata->vif.p2p = true; 1760 fallthrough; 1761 case NL80211_IFTYPE_STATION: 1762 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1763 ieee80211_sta_setup_sdata(sdata); 1764 break; 1765 case NL80211_IFTYPE_OCB: 1766 sdata->vif.bss_conf.bssid = bssid_wildcard; 1767 ieee80211_ocb_setup_sdata(sdata); 1768 break; 1769 case NL80211_IFTYPE_ADHOC: 1770 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1771 ieee80211_ibss_setup_sdata(sdata); 1772 break; 1773 case NL80211_IFTYPE_MESH_POINT: 1774 if (ieee80211_vif_is_mesh(&sdata->vif)) 1775 ieee80211_mesh_init_sdata(sdata); 1776 break; 1777 case NL80211_IFTYPE_MONITOR: 1778 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1779 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1780 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1781 MONITOR_FLAG_OTHER_BSS; 1782 break; 1783 case NL80211_IFTYPE_NAN: 1784 idr_init(&sdata->u.nan.function_inst_ids); 1785 spin_lock_init(&sdata->u.nan.func_lock); 1786 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1787 break; 1788 case NL80211_IFTYPE_AP_VLAN: 1789 case NL80211_IFTYPE_P2P_DEVICE: 1790 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1791 break; 1792 case NL80211_IFTYPE_UNSPECIFIED: 1793 case NL80211_IFTYPE_WDS: 1794 case NUM_NL80211_IFTYPES: 1795 WARN_ON(1); 1796 break; 1797 } 1798 1799 /* need to do this after the switch so vif.type is correct */ 1800 ieee80211_link_setup(&sdata->deflink); 1801 1802 ieee80211_debugfs_recreate_netdev(sdata, false); 1803 } 1804 1805 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1806 enum nl80211_iftype type) 1807 { 1808 struct ieee80211_local *local = sdata->local; 1809 int ret, err; 1810 enum nl80211_iftype internal_type = type; 1811 bool p2p = false; 1812 1813 ASSERT_RTNL(); 1814 1815 if (!local->ops->change_interface) 1816 return -EBUSY; 1817 1818 /* for now, don't support changing while links exist */ 1819 if (ieee80211_vif_is_mld(&sdata->vif)) 1820 return -EBUSY; 1821 1822 switch (sdata->vif.type) { 1823 case NL80211_IFTYPE_AP: 1824 if (!list_empty(&sdata->u.ap.vlans)) 1825 return -EBUSY; 1826 break; 1827 case NL80211_IFTYPE_STATION: 1828 case NL80211_IFTYPE_ADHOC: 1829 case NL80211_IFTYPE_OCB: 1830 /* 1831 * Could maybe also all others here? 1832 * Just not sure how that interacts 1833 * with the RX/config path e.g. for 1834 * mesh. 1835 */ 1836 break; 1837 default: 1838 return -EBUSY; 1839 } 1840 1841 switch (type) { 1842 case NL80211_IFTYPE_AP: 1843 case NL80211_IFTYPE_STATION: 1844 case NL80211_IFTYPE_ADHOC: 1845 case NL80211_IFTYPE_OCB: 1846 /* 1847 * Could probably support everything 1848 * but here. 1849 */ 1850 break; 1851 case NL80211_IFTYPE_P2P_CLIENT: 1852 p2p = true; 1853 internal_type = NL80211_IFTYPE_STATION; 1854 break; 1855 case NL80211_IFTYPE_P2P_GO: 1856 p2p = true; 1857 internal_type = NL80211_IFTYPE_AP; 1858 break; 1859 default: 1860 return -EBUSY; 1861 } 1862 1863 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1864 if (ret) 1865 return ret; 1866 1867 ieee80211_stop_vif_queues(local, sdata, 1868 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1869 /* do_stop will synchronize_rcu() first thing */ 1870 ieee80211_do_stop(sdata, false); 1871 1872 ieee80211_teardown_sdata(sdata); 1873 1874 ieee80211_set_sdata_offload_flags(sdata); 1875 ret = drv_change_interface(local, sdata, internal_type, p2p); 1876 if (ret) 1877 type = ieee80211_vif_type_p2p(&sdata->vif); 1878 1879 /* 1880 * Ignore return value here, there's not much we can do since 1881 * the driver changed the interface type internally already. 1882 * The warnings will hopefully make driver authors fix it :-) 1883 */ 1884 ieee80211_check_queues(sdata, type); 1885 1886 ieee80211_setup_sdata(sdata, type); 1887 ieee80211_set_vif_encap_ops(sdata); 1888 1889 err = ieee80211_do_open(&sdata->wdev, false); 1890 WARN(err, "type change: do_open returned %d", err); 1891 1892 ieee80211_wake_vif_queues(local, sdata, 1893 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1894 return ret; 1895 } 1896 1897 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1898 enum nl80211_iftype type) 1899 { 1900 int ret; 1901 1902 ASSERT_RTNL(); 1903 1904 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1905 return 0; 1906 1907 if (ieee80211_sdata_running(sdata)) { 1908 ret = ieee80211_runtime_change_iftype(sdata, type); 1909 if (ret) 1910 return ret; 1911 } else { 1912 /* Purge and reset type-dependent state. */ 1913 ieee80211_teardown_sdata(sdata); 1914 ieee80211_setup_sdata(sdata, type); 1915 } 1916 1917 /* reset some values that shouldn't be kept across type changes */ 1918 if (type == NL80211_IFTYPE_STATION) 1919 sdata->u.mgd.use_4addr = false; 1920 1921 return 0; 1922 } 1923 1924 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1925 u8 *perm_addr, enum nl80211_iftype type) 1926 { 1927 struct ieee80211_sub_if_data *sdata; 1928 u64 mask, start, addr, val, inc; 1929 u8 *m; 1930 u8 tmp_addr[ETH_ALEN]; 1931 int i; 1932 1933 lockdep_assert_wiphy(local->hw.wiphy); 1934 1935 /* default ... something at least */ 1936 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1937 1938 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1939 local->hw.wiphy->n_addresses <= 1) 1940 return; 1941 1942 switch (type) { 1943 case NL80211_IFTYPE_MONITOR: 1944 /* doesn't matter */ 1945 break; 1946 case NL80211_IFTYPE_AP_VLAN: 1947 /* match up with an AP interface */ 1948 list_for_each_entry(sdata, &local->interfaces, list) { 1949 if (sdata->vif.type != NL80211_IFTYPE_AP) 1950 continue; 1951 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1952 break; 1953 } 1954 /* keep default if no AP interface present */ 1955 break; 1956 case NL80211_IFTYPE_P2P_CLIENT: 1957 case NL80211_IFTYPE_P2P_GO: 1958 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1959 list_for_each_entry(sdata, &local->interfaces, list) { 1960 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1961 continue; 1962 if (!ieee80211_sdata_running(sdata)) 1963 continue; 1964 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1965 return; 1966 } 1967 } 1968 fallthrough; 1969 default: 1970 /* assign a new address if possible -- try n_addresses first */ 1971 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1972 bool used = false; 1973 1974 list_for_each_entry(sdata, &local->interfaces, list) { 1975 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1976 sdata->vif.addr)) { 1977 used = true; 1978 break; 1979 } 1980 } 1981 1982 if (!used) { 1983 memcpy(perm_addr, 1984 local->hw.wiphy->addresses[i].addr, 1985 ETH_ALEN); 1986 break; 1987 } 1988 } 1989 1990 /* try mask if available */ 1991 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1992 break; 1993 1994 m = local->hw.wiphy->addr_mask; 1995 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1996 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1997 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1998 1999 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2000 /* not a contiguous mask ... not handled now! */ 2001 pr_info("not contiguous\n"); 2002 break; 2003 } 2004 2005 /* 2006 * Pick address of existing interface in case user changed 2007 * MAC address manually, default to perm_addr. 2008 */ 2009 m = local->hw.wiphy->perm_addr; 2010 list_for_each_entry(sdata, &local->interfaces, list) { 2011 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2012 continue; 2013 m = sdata->vif.addr; 2014 break; 2015 } 2016 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2017 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2018 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2019 2020 inc = 1ULL<<__ffs64(mask); 2021 val = (start & mask); 2022 addr = (start & ~mask) | (val & mask); 2023 do { 2024 bool used = false; 2025 2026 tmp_addr[5] = addr >> 0*8; 2027 tmp_addr[4] = addr >> 1*8; 2028 tmp_addr[3] = addr >> 2*8; 2029 tmp_addr[2] = addr >> 3*8; 2030 tmp_addr[1] = addr >> 4*8; 2031 tmp_addr[0] = addr >> 5*8; 2032 2033 val += inc; 2034 2035 list_for_each_entry(sdata, &local->interfaces, list) { 2036 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2037 used = true; 2038 break; 2039 } 2040 } 2041 2042 if (!used) { 2043 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2044 break; 2045 } 2046 addr = (start & ~mask) | (val & mask); 2047 } while (addr != start); 2048 2049 break; 2050 } 2051 } 2052 2053 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2054 unsigned char name_assign_type, 2055 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2056 struct vif_params *params) 2057 { 2058 struct net_device *ndev = NULL; 2059 struct ieee80211_sub_if_data *sdata = NULL; 2060 struct txq_info *txqi; 2061 int ret, i; 2062 2063 ASSERT_RTNL(); 2064 lockdep_assert_wiphy(local->hw.wiphy); 2065 2066 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2067 struct wireless_dev *wdev; 2068 2069 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2070 GFP_KERNEL); 2071 if (!sdata) 2072 return -ENOMEM; 2073 wdev = &sdata->wdev; 2074 2075 sdata->dev = NULL; 2076 strscpy(sdata->name, name, IFNAMSIZ); 2077 ieee80211_assign_perm_addr(local, wdev->address, type); 2078 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2079 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2080 } else { 2081 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2082 sizeof(void *)); 2083 int txq_size = 0; 2084 2085 if (type != NL80211_IFTYPE_AP_VLAN && 2086 (type != NL80211_IFTYPE_MONITOR || 2087 (params->flags & MONITOR_FLAG_ACTIVE))) 2088 txq_size += sizeof(struct txq_info) + 2089 local->hw.txq_data_size; 2090 2091 ndev = alloc_netdev_mqs(size + txq_size, 2092 name, name_assign_type, 2093 ieee80211_if_setup, 1, 1); 2094 if (!ndev) 2095 return -ENOMEM; 2096 2097 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2098 2099 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2100 if (!ndev->tstats) { 2101 free_netdev(ndev); 2102 return -ENOMEM; 2103 } 2104 2105 ndev->needed_headroom = local->tx_headroom + 2106 4*6 /* four MAC addresses */ 2107 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2108 + 6 /* mesh */ 2109 + 8 /* rfc1042/bridge tunnel */ 2110 - ETH_HLEN /* ethernet hard_header_len */ 2111 + IEEE80211_ENCRYPT_HEADROOM; 2112 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2113 2114 ret = dev_alloc_name(ndev, ndev->name); 2115 if (ret < 0) { 2116 ieee80211_if_free(ndev); 2117 free_netdev(ndev); 2118 return ret; 2119 } 2120 2121 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2122 if (is_valid_ether_addr(params->macaddr)) 2123 eth_hw_addr_set(ndev, params->macaddr); 2124 else 2125 eth_hw_addr_set(ndev, ndev->perm_addr); 2126 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2127 2128 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2129 sdata = netdev_priv(ndev); 2130 ndev->ieee80211_ptr = &sdata->wdev; 2131 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2132 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2133 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2134 2135 if (txq_size) { 2136 txqi = netdev_priv(ndev) + size; 2137 ieee80211_txq_init(sdata, NULL, txqi, 0); 2138 } 2139 2140 sdata->dev = ndev; 2141 } 2142 2143 /* initialise type-independent data */ 2144 sdata->wdev.wiphy = local->hw.wiphy; 2145 2146 ieee80211_sdata_init(local, sdata); 2147 2148 ieee80211_init_frag_cache(&sdata->frags); 2149 2150 INIT_LIST_HEAD(&sdata->key_list); 2151 2152 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2153 ieee80211_delayed_tailroom_dec); 2154 2155 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2156 struct ieee80211_supported_band *sband; 2157 sband = local->hw.wiphy->bands[i]; 2158 sdata->rc_rateidx_mask[i] = 2159 sband ? (1 << sband->n_bitrates) - 1 : 0; 2160 if (sband) { 2161 __le16 cap; 2162 u16 *vht_rate_mask; 2163 2164 memcpy(sdata->rc_rateidx_mcs_mask[i], 2165 sband->ht_cap.mcs.rx_mask, 2166 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2167 2168 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2169 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2170 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2171 } else { 2172 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2173 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2174 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2175 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2176 } 2177 } 2178 2179 ieee80211_set_default_queues(sdata); 2180 2181 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2182 sdata->deflink.user_power_level = local->user_power_level; 2183 2184 /* setup type-dependent data */ 2185 ieee80211_setup_sdata(sdata, type); 2186 2187 if (ndev) { 2188 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2189 if (type == NL80211_IFTYPE_STATION) 2190 sdata->u.mgd.use_4addr = params->use_4addr; 2191 2192 ndev->features |= local->hw.netdev_features; 2193 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2194 ndev->hw_features |= ndev->features & 2195 MAC80211_SUPPORTED_FEATURES_TX; 2196 sdata->vif.netdev_features = local->hw.netdev_features; 2197 2198 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2199 2200 /* MTU range is normally 256 - 2304, where the upper limit is 2201 * the maximum MSDU size. Monitor interfaces send and receive 2202 * MPDU and A-MSDU frames which may be much larger so we do 2203 * not impose an upper limit in that case. 2204 */ 2205 ndev->min_mtu = 256; 2206 if (type == NL80211_IFTYPE_MONITOR) 2207 ndev->max_mtu = 0; 2208 else 2209 ndev->max_mtu = local->hw.max_mtu; 2210 2211 ret = cfg80211_register_netdevice(ndev); 2212 if (ret) { 2213 free_netdev(ndev); 2214 return ret; 2215 } 2216 } 2217 2218 mutex_lock(&local->iflist_mtx); 2219 list_add_tail_rcu(&sdata->list, &local->interfaces); 2220 mutex_unlock(&local->iflist_mtx); 2221 2222 if (new_wdev) 2223 *new_wdev = &sdata->wdev; 2224 2225 return 0; 2226 } 2227 2228 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2229 { 2230 ASSERT_RTNL(); 2231 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2232 2233 mutex_lock(&sdata->local->iflist_mtx); 2234 list_del_rcu(&sdata->list); 2235 mutex_unlock(&sdata->local->iflist_mtx); 2236 2237 if (sdata->vif.txq) 2238 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2239 2240 synchronize_rcu(); 2241 2242 cfg80211_unregister_wdev(&sdata->wdev); 2243 2244 if (!sdata->dev) { 2245 ieee80211_teardown_sdata(sdata); 2246 kfree(sdata); 2247 } 2248 } 2249 2250 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2251 { 2252 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2253 return; 2254 ieee80211_do_stop(sdata, true); 2255 } 2256 2257 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2258 { 2259 struct ieee80211_sub_if_data *sdata, *tmp; 2260 LIST_HEAD(unreg_list); 2261 2262 ASSERT_RTNL(); 2263 2264 /* Before destroying the interfaces, make sure they're all stopped so 2265 * that the hardware is stopped. Otherwise, the driver might still be 2266 * iterating the interfaces during the shutdown, e.g. from a worker 2267 * or from RX processing or similar, and if it does so (using atomic 2268 * iteration) while we're manipulating the list, the iteration will 2269 * crash. 2270 * 2271 * After this, the hardware should be stopped and the driver should 2272 * have stopped all of its activities, so that we can do RCU-unaware 2273 * manipulations of the interface list below. 2274 */ 2275 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2276 2277 wiphy_lock(local->hw.wiphy); 2278 2279 WARN(local->open_count, "%s: open count remains %d\n", 2280 wiphy_name(local->hw.wiphy), local->open_count); 2281 2282 mutex_lock(&local->iflist_mtx); 2283 list_splice_init(&local->interfaces, &unreg_list); 2284 mutex_unlock(&local->iflist_mtx); 2285 2286 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2287 bool netdev = sdata->dev; 2288 2289 /* 2290 * Remove IP addresses explicitly, since the notifier will 2291 * skip the callbacks if wdev->registered is false, since 2292 * we can't acquire the wiphy_lock() again there if already 2293 * inside this locked section. 2294 */ 2295 sdata->vif.cfg.arp_addr_cnt = 0; 2296 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2297 sdata->u.mgd.associated) 2298 ieee80211_vif_cfg_change_notify(sdata, 2299 BSS_CHANGED_ARP_FILTER); 2300 2301 list_del(&sdata->list); 2302 cfg80211_unregister_wdev(&sdata->wdev); 2303 2304 if (!netdev) 2305 kfree(sdata); 2306 } 2307 wiphy_unlock(local->hw.wiphy); 2308 } 2309 2310 static int netdev_notify(struct notifier_block *nb, 2311 unsigned long state, void *ptr) 2312 { 2313 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2314 struct ieee80211_sub_if_data *sdata; 2315 2316 if (state != NETDEV_CHANGENAME) 2317 return NOTIFY_DONE; 2318 2319 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2320 return NOTIFY_DONE; 2321 2322 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2323 return NOTIFY_DONE; 2324 2325 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2326 memcpy(sdata->name, dev->name, IFNAMSIZ); 2327 ieee80211_debugfs_rename_netdev(sdata); 2328 2329 return NOTIFY_OK; 2330 } 2331 2332 static struct notifier_block mac80211_netdev_notifier = { 2333 .notifier_call = netdev_notify, 2334 }; 2335 2336 int ieee80211_iface_init(void) 2337 { 2338 return register_netdevice_notifier(&mac80211_netdev_notifier); 2339 } 2340 2341 void ieee80211_iface_exit(void) 2342 { 2343 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2344 } 2345 2346 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2347 { 2348 if (sdata->vif.type == NL80211_IFTYPE_AP) 2349 atomic_inc(&sdata->u.ap.num_mcast_sta); 2350 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2351 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2352 } 2353 2354 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2355 { 2356 if (sdata->vif.type == NL80211_IFTYPE_AP) 2357 atomic_dec(&sdata->u.ap.num_mcast_sta); 2358 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2359 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2360 } 2361