1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Interface handling 4 * 5 * Copyright 2002-2005, Instant802 Networks, Inc. 6 * Copyright 2005-2006, Devicescape Software, Inc. 7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 9 * Copyright 2013-2014 Intel Mobile Communications GmbH 10 * Copyright (c) 2016 Intel Deutschland GmbH 11 * Copyright (C) 2018-2024 Intel Corporation 12 */ 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/if_arp.h> 16 #include <linux/netdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/kcov.h> 19 #include <net/mac80211.h> 20 #include <net/ieee80211_radiotap.h> 21 #include "ieee80211_i.h" 22 #include "sta_info.h" 23 #include "debugfs_netdev.h" 24 #include "mesh.h" 25 #include "led.h" 26 #include "driver-ops.h" 27 #include "wme.h" 28 #include "rate.h" 29 30 /** 31 * DOC: Interface list locking 32 * 33 * The interface list in each struct ieee80211_local is protected 34 * three-fold: 35 * 36 * (1) modifications may only be done under the RTNL *and* wiphy mutex 37 * *and* iflist_mtx 38 * (2) modifications are done in an RCU manner so atomic readers 39 * can traverse the list in RCU-safe blocks. 40 * 41 * As a consequence, reads (traversals) of the list can be protected 42 * by either the RTNL, the wiphy mutex, the iflist_mtx or RCU. 43 */ 44 45 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work); 46 47 bool __ieee80211_recalc_txpower(struct ieee80211_link_data *link) 48 { 49 struct ieee80211_chanctx_conf *chanctx_conf; 50 int power; 51 52 rcu_read_lock(); 53 chanctx_conf = rcu_dereference(link->conf->chanctx_conf); 54 if (!chanctx_conf) { 55 rcu_read_unlock(); 56 return false; 57 } 58 59 power = ieee80211_chandef_max_power(&chanctx_conf->def); 60 rcu_read_unlock(); 61 62 if (link->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 63 power = min(power, link->user_power_level); 64 65 if (link->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 66 power = min(power, link->ap_power_level); 67 68 if (power != link->conf->txpower) { 69 link->conf->txpower = power; 70 return true; 71 } 72 73 return false; 74 } 75 76 void ieee80211_recalc_txpower(struct ieee80211_link_data *link, 77 bool update_bss) 78 { 79 if (__ieee80211_recalc_txpower(link) || 80 (update_bss && ieee80211_sdata_running(link->sdata))) 81 ieee80211_link_info_change_notify(link->sdata, link, 82 BSS_CHANGED_TXPOWER); 83 } 84 85 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 86 { 87 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 88 return 0; 89 90 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 91 return IEEE80211_CONF_CHANGE_IDLE; 92 } 93 94 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 95 { 96 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 97 return 0; 98 99 ieee80211_flush_queues(local, NULL, false); 100 101 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 102 return IEEE80211_CONF_CHANGE_IDLE; 103 } 104 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 106 bool force_active) 107 { 108 bool working, scanning, active; 109 unsigned int led_trig_start = 0, led_trig_stop = 0; 110 111 lockdep_assert_wiphy(local->hw.wiphy); 112 113 active = force_active || 114 !list_empty(&local->chanctx_list) || 115 local->monitors; 116 117 working = !local->ops->remain_on_channel && 118 !list_empty(&local->roc_list); 119 120 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 121 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 122 123 if (working || scanning) 124 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 125 else 126 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 127 128 if (active) 129 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 130 else 131 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 132 133 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 134 135 if (working || scanning || active) 136 return __ieee80211_idle_off(local); 137 return __ieee80211_idle_on(local); 138 } 139 140 u32 ieee80211_idle_off(struct ieee80211_local *local) 141 { 142 return __ieee80211_recalc_idle(local, true); 143 } 144 145 void ieee80211_recalc_idle(struct ieee80211_local *local) 146 { 147 u32 change = __ieee80211_recalc_idle(local, false); 148 if (change) 149 ieee80211_hw_config(local, change); 150 } 151 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 153 bool check_dup) 154 { 155 struct ieee80211_local *local = sdata->local; 156 struct ieee80211_sub_if_data *iter; 157 u64 new, mask, tmp; 158 u8 *m; 159 int ret = 0; 160 161 lockdep_assert_wiphy(local->hw.wiphy); 162 163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 164 return 0; 165 166 m = addr; 167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 170 171 m = local->hw.wiphy->addr_mask; 172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 175 176 if (!check_dup) 177 return ret; 178 179 list_for_each_entry(iter, &local->interfaces, list) { 180 if (iter == sdata) 181 continue; 182 183 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 184 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 185 continue; 186 187 m = iter->vif.addr; 188 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 189 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 190 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 191 192 if ((new & ~mask) != (tmp & ~mask)) { 193 ret = -EINVAL; 194 break; 195 } 196 } 197 198 return ret; 199 } 200 201 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 202 { 203 struct ieee80211_roc_work *roc; 204 struct ieee80211_local *local = sdata->local; 205 struct ieee80211_sub_if_data *scan_sdata; 206 int ret = 0; 207 208 lockdep_assert_wiphy(local->hw.wiphy); 209 210 /* To be the most flexible here we want to only limit changing the 211 * address if the specific interface is doing offchannel work or 212 * scanning. 213 */ 214 if (netif_carrier_ok(sdata->dev)) 215 return -EBUSY; 216 217 /* First check no ROC work is happening on this iface */ 218 list_for_each_entry(roc, &local->roc_list, list) { 219 if (roc->sdata != sdata) 220 continue; 221 222 if (roc->started) { 223 ret = -EBUSY; 224 goto unlock; 225 } 226 } 227 228 /* And if this iface is scanning */ 229 if (local->scanning) { 230 scan_sdata = rcu_dereference_protected(local->scan_sdata, 231 lockdep_is_held(&local->hw.wiphy->mtx)); 232 if (sdata == scan_sdata) 233 ret = -EBUSY; 234 } 235 236 switch (sdata->vif.type) { 237 case NL80211_IFTYPE_STATION: 238 case NL80211_IFTYPE_P2P_CLIENT: 239 /* More interface types could be added here but changing the 240 * address while powered makes the most sense in client modes. 241 */ 242 break; 243 default: 244 ret = -EOPNOTSUPP; 245 } 246 247 unlock: 248 return ret; 249 } 250 251 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata, 252 void *addr) 253 { 254 struct ieee80211_local *local = sdata->local; 255 struct sockaddr *sa = addr; 256 bool check_dup = true; 257 bool live = false; 258 int ret; 259 260 if (ieee80211_sdata_running(sdata)) { 261 ret = ieee80211_can_powered_addr_change(sdata); 262 if (ret) 263 return ret; 264 265 live = true; 266 } 267 268 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 269 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 270 check_dup = false; 271 272 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 273 if (ret) 274 return ret; 275 276 if (live) 277 drv_remove_interface(local, sdata); 278 ret = eth_mac_addr(sdata->dev, sa); 279 280 if (ret == 0) { 281 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 282 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 283 } 284 285 /* Regardless of eth_mac_addr() return we still want to add the 286 * interface back. This should not fail... 287 */ 288 if (live) 289 WARN_ON(drv_add_interface(local, sdata)); 290 291 return ret; 292 } 293 294 static int ieee80211_change_mac(struct net_device *dev, void *addr) 295 { 296 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 297 struct ieee80211_local *local = sdata->local; 298 int ret; 299 300 /* 301 * This happens during unregistration if there's a bond device 302 * active (maybe other cases?) and we must get removed from it. 303 * But we really don't care anymore if it's not registered now. 304 */ 305 if (!dev->ieee80211_ptr->registered) 306 return 0; 307 308 wiphy_lock(local->hw.wiphy); 309 ret = _ieee80211_change_mac(sdata, addr); 310 wiphy_unlock(local->hw.wiphy); 311 312 return ret; 313 } 314 315 static inline int identical_mac_addr_allowed(int type1, int type2) 316 { 317 return type1 == NL80211_IFTYPE_MONITOR || 318 type2 == NL80211_IFTYPE_MONITOR || 319 type1 == NL80211_IFTYPE_P2P_DEVICE || 320 type2 == NL80211_IFTYPE_P2P_DEVICE || 321 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 322 (type1 == NL80211_IFTYPE_AP_VLAN && 323 (type2 == NL80211_IFTYPE_AP || 324 type2 == NL80211_IFTYPE_AP_VLAN)); 325 } 326 327 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 328 enum nl80211_iftype iftype) 329 { 330 struct ieee80211_local *local = sdata->local; 331 struct ieee80211_sub_if_data *nsdata; 332 333 ASSERT_RTNL(); 334 lockdep_assert_wiphy(local->hw.wiphy); 335 336 /* we hold the RTNL here so can safely walk the list */ 337 list_for_each_entry(nsdata, &local->interfaces, list) { 338 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 339 /* 340 * Only OCB and monitor mode may coexist 341 */ 342 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 343 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 344 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 345 nsdata->vif.type == NL80211_IFTYPE_OCB)) 346 return -EBUSY; 347 348 /* 349 * Allow only a single IBSS interface to be up at any 350 * time. This is restricted because beacon distribution 351 * cannot work properly if both are in the same IBSS. 352 * 353 * To remove this restriction we'd have to disallow them 354 * from setting the same SSID on different IBSS interfaces 355 * belonging to the same hardware. Then, however, we're 356 * faced with having to adopt two different TSF timers... 357 */ 358 if (iftype == NL80211_IFTYPE_ADHOC && 359 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 360 return -EBUSY; 361 /* 362 * will not add another interface while any channel 363 * switch is active. 364 */ 365 if (nsdata->vif.bss_conf.csa_active) 366 return -EBUSY; 367 368 /* 369 * The remaining checks are only performed for interfaces 370 * with the same MAC address. 371 */ 372 if (!ether_addr_equal(sdata->vif.addr, 373 nsdata->vif.addr)) 374 continue; 375 376 /* 377 * check whether it may have the same address 378 */ 379 if (!identical_mac_addr_allowed(iftype, 380 nsdata->vif.type)) 381 return -ENOTUNIQ; 382 383 /* No support for VLAN with MLO yet */ 384 if (iftype == NL80211_IFTYPE_AP_VLAN && 385 sdata->wdev.use_4addr && 386 nsdata->vif.type == NL80211_IFTYPE_AP && 387 nsdata->vif.valid_links) 388 return -EOPNOTSUPP; 389 390 /* 391 * can only add VLANs to enabled APs 392 */ 393 if (iftype == NL80211_IFTYPE_AP_VLAN && 394 nsdata->vif.type == NL80211_IFTYPE_AP) 395 sdata->bss = &nsdata->u.ap; 396 } 397 } 398 399 return ieee80211_check_combinations(sdata, NULL, 0, 0, -1); 400 } 401 402 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 403 enum nl80211_iftype iftype) 404 { 405 int n_queues = sdata->local->hw.queues; 406 int i; 407 408 if (iftype == NL80211_IFTYPE_NAN) 409 return 0; 410 411 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 412 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 413 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 414 IEEE80211_INVAL_HW_QUEUE)) 415 return -EINVAL; 416 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 417 n_queues)) 418 return -EINVAL; 419 } 420 } 421 422 if ((iftype != NL80211_IFTYPE_AP && 423 iftype != NL80211_IFTYPE_P2P_GO && 424 iftype != NL80211_IFTYPE_MESH_POINT) || 425 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 426 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 427 return 0; 428 } 429 430 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 431 return -EINVAL; 432 433 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 434 return -EINVAL; 435 436 return 0; 437 } 438 439 static int ieee80211_open(struct net_device *dev) 440 { 441 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 442 int err; 443 444 /* fail early if user set an invalid address */ 445 if (!is_valid_ether_addr(dev->dev_addr)) 446 return -EADDRNOTAVAIL; 447 448 wiphy_lock(sdata->local->hw.wiphy); 449 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 450 if (err) 451 goto out; 452 453 err = ieee80211_do_open(&sdata->wdev, true); 454 out: 455 wiphy_unlock(sdata->local->hw.wiphy); 456 457 return err; 458 } 459 460 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 461 { 462 struct ieee80211_local *local = sdata->local; 463 unsigned long flags; 464 struct sk_buff_head freeq; 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->deflink.dfs_cac_timer_work); 554 555 if (sdata->wdev.links[0].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, 0); 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 /* 641 * Since ieee80211_free_txskb() may issue __dev_queue_xmit() 642 * which should be called with interrupts enabled, reclamation 643 * is done in two phases: 644 */ 645 __skb_queue_head_init(&freeq); 646 647 /* unlink from local queues... */ 648 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 649 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 650 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 651 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 652 if (info->control.vif == &sdata->vif) { 653 __skb_unlink(skb, &local->pending[i]); 654 __skb_queue_tail(&freeq, skb); 655 } 656 } 657 } 658 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 659 660 /* ... and perform actual reclamation with interrupts enabled. */ 661 skb_queue_walk_safe(&freeq, skb, tmp) { 662 __skb_unlink(skb, &freeq); 663 ieee80211_free_txskb(&local->hw, skb); 664 } 665 666 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 667 ieee80211_txq_remove_vlan(local, sdata); 668 669 sdata->bss = NULL; 670 671 if (local->open_count == 0) 672 ieee80211_clear_tx_pending(local); 673 674 sdata->vif.bss_conf.beacon_int = 0; 675 676 /* 677 * If the interface goes down while suspended, presumably because 678 * the device was unplugged and that happens before our resume, 679 * then the driver is already unconfigured and the remainder of 680 * this function isn't needed. 681 * XXX: what about WoWLAN? If the device has software state, e.g. 682 * memory allocated, it might expect teardown commands from 683 * mac80211 here? 684 */ 685 if (local->suspended) { 686 WARN_ON(local->wowlan); 687 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 688 return; 689 } 690 691 switch (sdata->vif.type) { 692 case NL80211_IFTYPE_AP_VLAN: 693 break; 694 case NL80211_IFTYPE_MONITOR: 695 if (local->monitors == 0) 696 ieee80211_del_virtual_monitor(local); 697 698 ieee80211_recalc_idle(local); 699 ieee80211_recalc_offload(local); 700 701 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) && 702 !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 703 break; 704 705 ieee80211_link_release_channel(&sdata->deflink); 706 fallthrough; 707 default: 708 if (!going_down) 709 break; 710 drv_remove_interface(local, sdata); 711 712 /* Clear private driver data to prevent reuse */ 713 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); 714 } 715 716 ieee80211_recalc_ps(local); 717 718 if (cancel_scan) 719 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 720 721 if (local->open_count == 0) { 722 ieee80211_stop_device(local, false); 723 724 /* no reconfiguring after stop! */ 725 return; 726 } 727 728 /* do after stop to avoid reconfiguring when we stop anyway */ 729 ieee80211_configure_filter(local); 730 ieee80211_hw_config(local, hw_reconf_flags); 731 732 if (local->monitors == local->open_count) 733 ieee80211_add_virtual_monitor(local); 734 } 735 736 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 737 { 738 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 739 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 740 741 if (!tx_vif) 742 return; 743 744 tx_sdata = vif_to_sdata(tx_vif); 745 sdata->vif.mbssid_tx_vif = NULL; 746 747 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 748 &tx_sdata->local->interfaces, list) { 749 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 750 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 751 ieee80211_sdata_running(non_tx_sdata)) { 752 non_tx_sdata->vif.mbssid_tx_vif = NULL; 753 dev_close(non_tx_sdata->wdev.netdev); 754 } 755 } 756 757 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 758 tx_sdata->vif.mbssid_tx_vif = NULL; 759 dev_close(tx_sdata->wdev.netdev); 760 } 761 } 762 763 static int ieee80211_stop(struct net_device *dev) 764 { 765 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 766 767 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 768 if (sdata->vif.type == NL80211_IFTYPE_AP) { 769 struct ieee80211_sub_if_data *vlan, *tmpsdata; 770 771 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 772 u.vlan.list) 773 dev_close(vlan->dev); 774 775 ieee80211_stop_mbssid(sdata); 776 } 777 778 wiphy_lock(sdata->local->hw.wiphy); 779 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 780 781 ieee80211_do_stop(sdata, true); 782 wiphy_unlock(sdata->local->hw.wiphy); 783 784 return 0; 785 } 786 787 static void ieee80211_set_multicast_list(struct net_device *dev) 788 { 789 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 790 struct ieee80211_local *local = sdata->local; 791 int allmulti, sdata_allmulti; 792 793 allmulti = !!(dev->flags & IFF_ALLMULTI); 794 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 795 796 if (allmulti != sdata_allmulti) { 797 if (dev->flags & IFF_ALLMULTI) 798 atomic_inc(&local->iff_allmultis); 799 else 800 atomic_dec(&local->iff_allmultis); 801 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 802 } 803 804 spin_lock_bh(&local->filter_lock); 805 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 806 spin_unlock_bh(&local->filter_lock); 807 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 808 } 809 810 /* 811 * Called when the netdev is removed or, by the code below, before 812 * the interface type changes. 813 */ 814 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 815 { 816 /* free extra data */ 817 ieee80211_free_keys(sdata, false); 818 819 ieee80211_debugfs_remove_netdev(sdata); 820 821 ieee80211_destroy_frag_cache(&sdata->frags); 822 823 if (ieee80211_vif_is_mesh(&sdata->vif)) 824 ieee80211_mesh_teardown_sdata(sdata); 825 826 ieee80211_vif_clear_links(sdata); 827 ieee80211_link_stop(&sdata->deflink); 828 } 829 830 static void ieee80211_uninit(struct net_device *dev) 831 { 832 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 833 } 834 835 static int ieee80211_netdev_setup_tc(struct net_device *dev, 836 enum tc_setup_type type, void *type_data) 837 { 838 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 839 struct ieee80211_local *local = sdata->local; 840 841 return drv_net_setup_tc(local, sdata, dev, type, type_data); 842 } 843 844 static const struct net_device_ops ieee80211_dataif_ops = { 845 .ndo_open = ieee80211_open, 846 .ndo_stop = ieee80211_stop, 847 .ndo_uninit = ieee80211_uninit, 848 .ndo_start_xmit = ieee80211_subif_start_xmit, 849 .ndo_set_rx_mode = ieee80211_set_multicast_list, 850 .ndo_set_mac_address = ieee80211_change_mac, 851 .ndo_setup_tc = ieee80211_netdev_setup_tc, 852 }; 853 854 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 855 struct sk_buff *skb, 856 struct net_device *sb_dev) 857 { 858 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 859 struct ieee80211_local *local = sdata->local; 860 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 861 struct ieee80211_hdr *hdr; 862 int len_rthdr; 863 864 if (local->hw.queues < IEEE80211_NUM_ACS) 865 return 0; 866 867 /* reset flags and info before parsing radiotap header */ 868 memset(info, 0, sizeof(*info)); 869 870 if (!ieee80211_parse_tx_radiotap(skb, dev)) 871 return 0; /* doesn't matter, frame will be dropped */ 872 873 len_rthdr = ieee80211_get_radiotap_len(skb->data); 874 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 875 if (skb->len < len_rthdr + 2 || 876 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 877 return 0; /* doesn't matter, frame will be dropped */ 878 879 return ieee80211_select_queue_80211(sdata, skb, hdr); 880 } 881 882 static const struct net_device_ops ieee80211_monitorif_ops = { 883 .ndo_open = ieee80211_open, 884 .ndo_stop = ieee80211_stop, 885 .ndo_uninit = ieee80211_uninit, 886 .ndo_start_xmit = ieee80211_monitor_start_xmit, 887 .ndo_set_rx_mode = ieee80211_set_multicast_list, 888 .ndo_set_mac_address = ieee80211_change_mac, 889 .ndo_select_queue = ieee80211_monitor_select_queue, 890 }; 891 892 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 893 struct net_device_path *path) 894 { 895 struct ieee80211_sub_if_data *sdata; 896 struct ieee80211_local *local; 897 struct sta_info *sta; 898 int ret = -ENOENT; 899 900 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 901 local = sdata->local; 902 903 if (!local->ops->net_fill_forward_path) 904 return -EOPNOTSUPP; 905 906 rcu_read_lock(); 907 switch (sdata->vif.type) { 908 case NL80211_IFTYPE_AP_VLAN: 909 sta = rcu_dereference(sdata->u.vlan.sta); 910 if (sta) 911 break; 912 if (sdata->wdev.use_4addr) 913 goto out; 914 if (is_multicast_ether_addr(ctx->daddr)) 915 goto out; 916 sta = sta_info_get_bss(sdata, ctx->daddr); 917 break; 918 case NL80211_IFTYPE_AP: 919 if (is_multicast_ether_addr(ctx->daddr)) 920 goto out; 921 sta = sta_info_get(sdata, ctx->daddr); 922 break; 923 case NL80211_IFTYPE_STATION: 924 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 925 sta = sta_info_get(sdata, ctx->daddr); 926 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 927 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 928 goto out; 929 930 break; 931 } 932 } 933 934 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 935 break; 936 default: 937 goto out; 938 } 939 940 if (!sta) 941 goto out; 942 943 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 944 out: 945 rcu_read_unlock(); 946 947 return ret; 948 } 949 950 static const struct net_device_ops ieee80211_dataif_8023_ops = { 951 .ndo_open = ieee80211_open, 952 .ndo_stop = ieee80211_stop, 953 .ndo_uninit = ieee80211_uninit, 954 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 955 .ndo_set_rx_mode = ieee80211_set_multicast_list, 956 .ndo_set_mac_address = ieee80211_change_mac, 957 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 958 .ndo_setup_tc = ieee80211_netdev_setup_tc, 959 }; 960 961 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 962 { 963 switch (iftype) { 964 /* P2P GO and client are mapped to AP/STATION types */ 965 case NL80211_IFTYPE_AP: 966 case NL80211_IFTYPE_STATION: 967 return true; 968 default: 969 return false; 970 } 971 } 972 973 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 974 { 975 struct ieee80211_local *local = sdata->local; 976 u32 flags; 977 978 flags = sdata->vif.offload_flags; 979 980 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 981 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 982 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 983 984 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 985 local->hw.wiphy->frag_threshold != (u32)-1) 986 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 987 988 if (local->monitors) 989 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 990 } else { 991 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 992 } 993 994 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 995 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 996 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 997 998 if (local->monitors && 999 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 1000 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1001 } else { 1002 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1003 } 1004 1005 if (sdata->vif.offload_flags == flags) 1006 return false; 1007 1008 sdata->vif.offload_flags = flags; 1009 ieee80211_check_fast_rx_iface(sdata); 1010 return true; 1011 } 1012 1013 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1014 { 1015 struct ieee80211_local *local = sdata->local; 1016 struct ieee80211_sub_if_data *bss = sdata; 1017 bool enabled; 1018 1019 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1020 if (!sdata->bss) 1021 return; 1022 1023 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1024 } 1025 1026 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1027 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1028 return; 1029 1030 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1031 if (sdata->wdev.use_4addr && 1032 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1033 enabled = false; 1034 1035 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1036 &ieee80211_dataif_ops; 1037 } 1038 1039 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1040 { 1041 struct ieee80211_local *local = sdata->local; 1042 struct ieee80211_sub_if_data *vsdata; 1043 1044 if (ieee80211_set_sdata_offload_flags(sdata)) { 1045 drv_update_vif_offload(local, sdata); 1046 ieee80211_set_vif_encap_ops(sdata); 1047 } 1048 1049 list_for_each_entry(vsdata, &local->interfaces, list) { 1050 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1051 vsdata->bss != &sdata->u.ap) 1052 continue; 1053 1054 ieee80211_set_vif_encap_ops(vsdata); 1055 } 1056 } 1057 1058 void ieee80211_recalc_offload(struct ieee80211_local *local) 1059 { 1060 struct ieee80211_sub_if_data *sdata; 1061 1062 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1063 return; 1064 1065 lockdep_assert_wiphy(local->hw.wiphy); 1066 1067 list_for_each_entry(sdata, &local->interfaces, list) { 1068 if (!ieee80211_sdata_running(sdata)) 1069 continue; 1070 1071 ieee80211_recalc_sdata_offload(sdata); 1072 } 1073 } 1074 1075 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1076 const int offset) 1077 { 1078 struct ieee80211_local *local = sdata->local; 1079 u32 flags = sdata->u.mntr.flags; 1080 1081 #define ADJUST(_f, _s) do { \ 1082 if (flags & MONITOR_FLAG_##_f) \ 1083 local->fif_##_s += offset; \ 1084 } while (0) 1085 1086 ADJUST(FCSFAIL, fcsfail); 1087 ADJUST(PLCPFAIL, plcpfail); 1088 ADJUST(CONTROL, control); 1089 ADJUST(CONTROL, pspoll); 1090 ADJUST(OTHER_BSS, other_bss); 1091 if (!(flags & MONITOR_FLAG_SKIP_TX)) 1092 local->tx_mntrs += offset; 1093 1094 #undef ADJUST 1095 } 1096 1097 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1098 { 1099 struct ieee80211_local *local = sdata->local; 1100 int i; 1101 1102 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1103 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1104 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1105 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1106 sdata->vif.hw_queue[i] = i; 1107 else 1108 sdata->vif.hw_queue[i] = 0; 1109 } 1110 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1111 } 1112 1113 static void ieee80211_sdata_init(struct ieee80211_local *local, 1114 struct ieee80211_sub_if_data *sdata) 1115 { 1116 sdata->local = local; 1117 1118 /* 1119 * Initialize the default link, so we can use link_id 0 for non-MLD, 1120 * and that continues to work for non-MLD-aware drivers that use just 1121 * vif.bss_conf instead of vif.link_conf. 1122 * 1123 * Note that we never change this, so if link ID 0 isn't used in an 1124 * MLD connection, we get a separate allocation for it. 1125 */ 1126 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1127 } 1128 1129 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1130 { 1131 struct ieee80211_sub_if_data *sdata; 1132 int ret; 1133 1134 ASSERT_RTNL(); 1135 lockdep_assert_wiphy(local->hw.wiphy); 1136 1137 if (local->monitor_sdata || 1138 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1139 return 0; 1140 1141 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1142 if (!sdata) 1143 return -ENOMEM; 1144 1145 /* set up data */ 1146 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1147 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1148 wiphy_name(local->hw.wiphy)); 1149 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1150 sdata->wdev.wiphy = local->hw.wiphy; 1151 1152 ieee80211_sdata_init(local, sdata); 1153 1154 ieee80211_set_default_queues(sdata); 1155 1156 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1157 ret = drv_add_interface(local, sdata); 1158 if (WARN_ON(ret)) { 1159 /* ok .. stupid driver, it asked for this! */ 1160 kfree(sdata); 1161 return ret; 1162 } 1163 } 1164 1165 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1166 1167 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1168 if (ret) { 1169 kfree(sdata); 1170 return ret; 1171 } 1172 1173 mutex_lock(&local->iflist_mtx); 1174 rcu_assign_pointer(local->monitor_sdata, sdata); 1175 mutex_unlock(&local->iflist_mtx); 1176 1177 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1178 IEEE80211_CHANCTX_EXCLUSIVE); 1179 if (ret) { 1180 mutex_lock(&local->iflist_mtx); 1181 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1182 mutex_unlock(&local->iflist_mtx); 1183 synchronize_net(); 1184 drv_remove_interface(local, sdata); 1185 kfree(sdata); 1186 return ret; 1187 } 1188 1189 skb_queue_head_init(&sdata->skb_queue); 1190 skb_queue_head_init(&sdata->status_queue); 1191 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1192 1193 return 0; 1194 } 1195 1196 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1197 { 1198 struct ieee80211_sub_if_data *sdata; 1199 1200 if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) 1201 return; 1202 1203 ASSERT_RTNL(); 1204 lockdep_assert_wiphy(local->hw.wiphy); 1205 1206 mutex_lock(&local->iflist_mtx); 1207 1208 sdata = rcu_dereference_protected(local->monitor_sdata, 1209 lockdep_is_held(&local->iflist_mtx)); 1210 if (!sdata) { 1211 mutex_unlock(&local->iflist_mtx); 1212 return; 1213 } 1214 1215 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1216 mutex_unlock(&local->iflist_mtx); 1217 1218 synchronize_net(); 1219 1220 ieee80211_link_release_channel(&sdata->deflink); 1221 1222 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1223 drv_remove_interface(local, sdata); 1224 1225 kfree(sdata); 1226 } 1227 1228 /* 1229 * NOTE: Be very careful when changing this function, it must NOT return 1230 * an error on interface type changes that have been pre-checked, so most 1231 * checks should be in ieee80211_check_concurrent_iface. 1232 */ 1233 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1234 { 1235 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1236 struct net_device *dev = wdev->netdev; 1237 struct ieee80211_local *local = sdata->local; 1238 u64 changed = 0; 1239 int res; 1240 u32 hw_reconf_flags = 0; 1241 1242 lockdep_assert_wiphy(local->hw.wiphy); 1243 1244 switch (sdata->vif.type) { 1245 case NL80211_IFTYPE_AP_VLAN: { 1246 struct ieee80211_sub_if_data *master; 1247 1248 if (!sdata->bss) 1249 return -ENOLINK; 1250 1251 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1252 1253 master = container_of(sdata->bss, 1254 struct ieee80211_sub_if_data, u.ap); 1255 sdata->control_port_protocol = 1256 master->control_port_protocol; 1257 sdata->control_port_no_encrypt = 1258 master->control_port_no_encrypt; 1259 sdata->control_port_over_nl80211 = 1260 master->control_port_over_nl80211; 1261 sdata->control_port_no_preauth = 1262 master->control_port_no_preauth; 1263 sdata->vif.cab_queue = master->vif.cab_queue; 1264 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1265 sizeof(sdata->vif.hw_queue)); 1266 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1267 1268 sdata->crypto_tx_tailroom_needed_cnt += 1269 master->crypto_tx_tailroom_needed_cnt; 1270 1271 break; 1272 } 1273 case NL80211_IFTYPE_AP: 1274 sdata->bss = &sdata->u.ap; 1275 break; 1276 case NL80211_IFTYPE_MESH_POINT: 1277 case NL80211_IFTYPE_STATION: 1278 case NL80211_IFTYPE_MONITOR: 1279 case NL80211_IFTYPE_ADHOC: 1280 case NL80211_IFTYPE_P2P_DEVICE: 1281 case NL80211_IFTYPE_OCB: 1282 case NL80211_IFTYPE_NAN: 1283 /* no special treatment */ 1284 break; 1285 case NL80211_IFTYPE_UNSPECIFIED: 1286 case NUM_NL80211_IFTYPES: 1287 case NL80211_IFTYPE_P2P_CLIENT: 1288 case NL80211_IFTYPE_P2P_GO: 1289 case NL80211_IFTYPE_WDS: 1290 /* cannot happen */ 1291 WARN_ON(1); 1292 break; 1293 } 1294 1295 if (local->open_count == 0) { 1296 /* here we can consider everything in good order (again) */ 1297 local->reconfig_failure = false; 1298 1299 res = drv_start(local); 1300 if (res) 1301 goto err_del_bss; 1302 ieee80211_led_radio(local, true); 1303 ieee80211_mod_tpt_led_trig(local, 1304 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1305 } 1306 1307 /* 1308 * Copy the hopefully now-present MAC address to 1309 * this interface, if it has the special null one. 1310 */ 1311 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1312 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1313 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1314 1315 if (!is_valid_ether_addr(dev->dev_addr)) { 1316 res = -EADDRNOTAVAIL; 1317 goto err_stop; 1318 } 1319 } 1320 1321 sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR || 1322 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE); 1323 switch (sdata->vif.type) { 1324 case NL80211_IFTYPE_AP_VLAN: 1325 /* no need to tell driver, but set carrier and chanctx */ 1326 if (sdata->bss->active) { 1327 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1328 netif_carrier_on(dev); 1329 ieee80211_set_vif_encap_ops(sdata); 1330 } else { 1331 netif_carrier_off(dev); 1332 } 1333 break; 1334 case NL80211_IFTYPE_MONITOR: 1335 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1336 local->cooked_mntrs++; 1337 break; 1338 } 1339 1340 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1341 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1342 res = drv_add_interface(local, sdata); 1343 if (res) 1344 goto err_stop; 1345 } else if (local->monitors == 0 && local->open_count == 0) { 1346 res = ieee80211_add_virtual_monitor(local); 1347 if (res) 1348 goto err_stop; 1349 } 1350 1351 /* must be before the call to ieee80211_configure_filter */ 1352 local->monitors++; 1353 if (local->monitors == 1) { 1354 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1355 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1356 } 1357 1358 ieee80211_adjust_monitor_flags(sdata, 1); 1359 ieee80211_configure_filter(local); 1360 ieee80211_recalc_offload(local); 1361 ieee80211_recalc_idle(local); 1362 1363 netif_carrier_on(dev); 1364 break; 1365 default: 1366 if (coming_up) { 1367 ieee80211_del_virtual_monitor(local); 1368 ieee80211_set_sdata_offload_flags(sdata); 1369 1370 res = drv_add_interface(local, sdata); 1371 if (res) 1372 goto err_stop; 1373 1374 ieee80211_set_vif_encap_ops(sdata); 1375 res = ieee80211_check_queues(sdata, 1376 ieee80211_vif_type_p2p(&sdata->vif)); 1377 if (res) 1378 goto err_del_interface; 1379 } 1380 1381 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1382 local->fif_pspoll++; 1383 local->fif_probe_req++; 1384 1385 ieee80211_configure_filter(local); 1386 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1387 local->fif_probe_req++; 1388 } 1389 1390 if (sdata->vif.probe_req_reg) 1391 drv_config_iface_filter(local, sdata, 1392 FIF_PROBE_REQ, 1393 FIF_PROBE_REQ); 1394 1395 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1396 sdata->vif.type != NL80211_IFTYPE_NAN) 1397 changed |= ieee80211_reset_erp_info(sdata); 1398 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1399 changed); 1400 1401 switch (sdata->vif.type) { 1402 case NL80211_IFTYPE_STATION: 1403 case NL80211_IFTYPE_ADHOC: 1404 case NL80211_IFTYPE_AP: 1405 case NL80211_IFTYPE_MESH_POINT: 1406 case NL80211_IFTYPE_OCB: 1407 netif_carrier_off(dev); 1408 break; 1409 case NL80211_IFTYPE_P2P_DEVICE: 1410 case NL80211_IFTYPE_NAN: 1411 break; 1412 default: 1413 /* not reached */ 1414 WARN_ON(1); 1415 } 1416 1417 /* 1418 * Set default queue parameters so drivers don't 1419 * need to initialise the hardware if the hardware 1420 * doesn't start up with sane defaults. 1421 * Enable QoS for anything but station interfaces. 1422 */ 1423 ieee80211_set_wmm_default(&sdata->deflink, true, 1424 sdata->vif.type != NL80211_IFTYPE_STATION); 1425 } 1426 1427 switch (sdata->vif.type) { 1428 case NL80211_IFTYPE_P2P_DEVICE: 1429 rcu_assign_pointer(local->p2p_sdata, sdata); 1430 break; 1431 case NL80211_IFTYPE_MONITOR: 1432 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1433 break; 1434 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1435 break; 1436 default: 1437 break; 1438 } 1439 1440 /* 1441 * set_multicast_list will be invoked by the networking core 1442 * which will check whether any increments here were done in 1443 * error and sync them down to the hardware as filter flags. 1444 */ 1445 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1446 atomic_inc(&local->iff_allmultis); 1447 1448 if (coming_up) 1449 local->open_count++; 1450 1451 if (local->open_count == 1) 1452 ieee80211_hw_conf_init(local); 1453 else if (hw_reconf_flags) 1454 ieee80211_hw_config(local, hw_reconf_flags); 1455 1456 ieee80211_recalc_ps(local); 1457 1458 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1459 1460 return 0; 1461 err_del_interface: 1462 drv_remove_interface(local, sdata); 1463 err_stop: 1464 if (!local->open_count) 1465 drv_stop(local, false); 1466 err_del_bss: 1467 sdata->bss = NULL; 1468 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1469 list_del(&sdata->u.vlan.list); 1470 /* might already be clear but that doesn't matter */ 1471 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1472 return res; 1473 } 1474 1475 static void ieee80211_if_setup(struct net_device *dev) 1476 { 1477 ether_setup(dev); 1478 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1479 dev->priv_flags |= IFF_NO_QUEUE; 1480 dev->netdev_ops = &ieee80211_dataif_ops; 1481 dev->needs_free_netdev = true; 1482 } 1483 1484 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1485 struct ieee80211_sub_if_data *sdata, 1486 struct sk_buff *skb) 1487 { 1488 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1489 1490 lockdep_assert_wiphy(local->hw.wiphy); 1491 1492 if (ieee80211_is_action(mgmt->frame_control) && 1493 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1494 struct sta_info *sta; 1495 int len = skb->len; 1496 1497 sta = sta_info_get_bss(sdata, mgmt->sa); 1498 if (sta) { 1499 switch (mgmt->u.action.u.addba_req.action_code) { 1500 case WLAN_ACTION_ADDBA_REQ: 1501 ieee80211_process_addba_request(local, sta, 1502 mgmt, len); 1503 break; 1504 case WLAN_ACTION_ADDBA_RESP: 1505 ieee80211_process_addba_resp(local, sta, 1506 mgmt, len); 1507 break; 1508 case WLAN_ACTION_DELBA: 1509 ieee80211_process_delba(sdata, sta, 1510 mgmt, len); 1511 break; 1512 default: 1513 WARN_ON(1); 1514 break; 1515 } 1516 } 1517 } else if (ieee80211_is_action(mgmt->frame_control) && 1518 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1519 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1520 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1521 struct ieee80211_rx_status *status; 1522 enum nl80211_band band; 1523 struct sta_info *sta; 1524 u8 opmode; 1525 1526 status = IEEE80211_SKB_RXCB(skb); 1527 band = status->band; 1528 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1529 1530 sta = sta_info_get_bss(sdata, mgmt->sa); 1531 1532 if (sta) 1533 ieee80211_vht_handle_opmode(sdata, 1534 &sta->deflink, 1535 opmode, band); 1536 1537 break; 1538 } 1539 case WLAN_VHT_ACTION_GROUPID_MGMT: 1540 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1541 mgmt); 1542 break; 1543 default: 1544 WARN_ON(1); 1545 break; 1546 } 1547 } else if (ieee80211_is_action(mgmt->frame_control) && 1548 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1549 switch (mgmt->u.action.u.s1g.action_code) { 1550 case WLAN_S1G_TWT_TEARDOWN: 1551 case WLAN_S1G_TWT_SETUP: 1552 ieee80211_s1g_rx_twt_action(sdata, skb); 1553 break; 1554 default: 1555 break; 1556 } 1557 } else if (ieee80211_is_action(mgmt->frame_control) && 1558 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1559 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1560 switch (mgmt->u.action.u.ttlm_req.action_code) { 1561 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1562 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1563 skb->len); 1564 break; 1565 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1566 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1567 skb->len); 1568 break; 1569 default: 1570 break; 1571 } 1572 } 1573 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1574 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1575 ieee80211_sta_rx_queued_ext(sdata, skb); 1576 else 1577 WARN_ON(1); 1578 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1579 struct ieee80211_hdr *hdr = (void *)mgmt; 1580 struct sta_info *sta; 1581 1582 /* 1583 * So the frame isn't mgmt, but frame_control 1584 * is at the right place anyway, of course, so 1585 * the if statement is correct. 1586 * 1587 * Warn if we have other data frame types here, 1588 * they must not get here. 1589 */ 1590 WARN_ON(hdr->frame_control & 1591 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1592 WARN_ON(!(hdr->seq_ctrl & 1593 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1594 /* 1595 * This was a fragment of a frame, received while 1596 * a block-ack session was active. That cannot be 1597 * right, so terminate the session. 1598 */ 1599 sta = sta_info_get_bss(sdata, mgmt->sa); 1600 if (sta) { 1601 u16 tid = ieee80211_get_tid(hdr); 1602 1603 __ieee80211_stop_rx_ba_session( 1604 sta, tid, WLAN_BACK_RECIPIENT, 1605 WLAN_REASON_QSTA_REQUIRE_SETUP, 1606 true); 1607 } 1608 } else switch (sdata->vif.type) { 1609 case NL80211_IFTYPE_STATION: 1610 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1611 break; 1612 case NL80211_IFTYPE_ADHOC: 1613 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1614 break; 1615 case NL80211_IFTYPE_MESH_POINT: 1616 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1617 break; 1618 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1619 break; 1620 default: 1621 WARN(1, "frame for unexpected interface type"); 1622 break; 1623 } 1624 } 1625 1626 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1627 struct sk_buff *skb) 1628 { 1629 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1630 1631 if (ieee80211_is_action(mgmt->frame_control) && 1632 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1633 switch (mgmt->u.action.u.s1g.action_code) { 1634 case WLAN_S1G_TWT_TEARDOWN: 1635 case WLAN_S1G_TWT_SETUP: 1636 ieee80211_s1g_status_twt_action(sdata, skb); 1637 break; 1638 default: 1639 break; 1640 } 1641 } 1642 } 1643 1644 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1645 { 1646 struct ieee80211_sub_if_data *sdata = 1647 container_of(work, struct ieee80211_sub_if_data, work); 1648 struct ieee80211_local *local = sdata->local; 1649 struct sk_buff *skb; 1650 1651 if (!ieee80211_sdata_running(sdata)) 1652 return; 1653 1654 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1655 return; 1656 1657 if (!ieee80211_can_run_worker(local)) 1658 return; 1659 1660 /* first process frames */ 1661 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1662 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1663 1664 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1665 ieee80211_process_tdls_channel_switch(sdata, skb); 1666 else 1667 ieee80211_iface_process_skb(local, sdata, skb); 1668 1669 kfree_skb(skb); 1670 kcov_remote_stop(); 1671 } 1672 1673 /* process status queue */ 1674 while ((skb = skb_dequeue(&sdata->status_queue))) { 1675 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1676 1677 ieee80211_iface_process_status(sdata, skb); 1678 kfree_skb(skb); 1679 1680 kcov_remote_stop(); 1681 } 1682 1683 /* then other type-dependent work */ 1684 switch (sdata->vif.type) { 1685 case NL80211_IFTYPE_STATION: 1686 ieee80211_sta_work(sdata); 1687 break; 1688 case NL80211_IFTYPE_ADHOC: 1689 ieee80211_ibss_work(sdata); 1690 break; 1691 case NL80211_IFTYPE_MESH_POINT: 1692 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1693 break; 1694 ieee80211_mesh_work(sdata); 1695 break; 1696 case NL80211_IFTYPE_OCB: 1697 ieee80211_ocb_work(sdata); 1698 break; 1699 default: 1700 break; 1701 } 1702 } 1703 1704 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1705 struct wiphy_work *work) 1706 { 1707 struct ieee80211_sub_if_data *sdata = 1708 container_of(work, struct ieee80211_sub_if_data, 1709 activate_links_work); 1710 struct ieee80211_local *local = wiphy_priv(wiphy); 1711 1712 if (local->in_reconfig) 1713 return; 1714 1715 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1716 sdata->desired_active_links = 0; 1717 } 1718 1719 /* 1720 * Helper function to initialise an interface to a specific type. 1721 */ 1722 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1723 enum nl80211_iftype type) 1724 { 1725 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1726 0xff, 0xff, 0xff}; 1727 1728 /* clear type-dependent unions */ 1729 memset(&sdata->u, 0, sizeof(sdata->u)); 1730 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1731 1732 /* and set some type-dependent values */ 1733 sdata->vif.type = type; 1734 sdata->vif.p2p = false; 1735 sdata->wdev.iftype = type; 1736 1737 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1738 sdata->control_port_no_encrypt = false; 1739 sdata->control_port_over_nl80211 = false; 1740 sdata->control_port_no_preauth = false; 1741 sdata->vif.cfg.idle = true; 1742 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1743 1744 sdata->noack_map = 0; 1745 1746 /* only monitor/p2p-device differ */ 1747 if (sdata->dev) { 1748 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1749 sdata->dev->type = ARPHRD_ETHER; 1750 } 1751 1752 skb_queue_head_init(&sdata->skb_queue); 1753 skb_queue_head_init(&sdata->status_queue); 1754 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1755 wiphy_work_init(&sdata->activate_links_work, 1756 ieee80211_activate_links_work); 1757 1758 switch (type) { 1759 case NL80211_IFTYPE_P2P_GO: 1760 type = NL80211_IFTYPE_AP; 1761 sdata->vif.type = type; 1762 sdata->vif.p2p = true; 1763 fallthrough; 1764 case NL80211_IFTYPE_AP: 1765 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1766 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1767 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1768 break; 1769 case NL80211_IFTYPE_P2P_CLIENT: 1770 type = NL80211_IFTYPE_STATION; 1771 sdata->vif.type = type; 1772 sdata->vif.p2p = true; 1773 fallthrough; 1774 case NL80211_IFTYPE_STATION: 1775 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1776 ieee80211_sta_setup_sdata(sdata); 1777 break; 1778 case NL80211_IFTYPE_OCB: 1779 sdata->vif.bss_conf.bssid = bssid_wildcard; 1780 ieee80211_ocb_setup_sdata(sdata); 1781 break; 1782 case NL80211_IFTYPE_ADHOC: 1783 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1784 ieee80211_ibss_setup_sdata(sdata); 1785 break; 1786 case NL80211_IFTYPE_MESH_POINT: 1787 if (ieee80211_vif_is_mesh(&sdata->vif)) 1788 ieee80211_mesh_init_sdata(sdata); 1789 break; 1790 case NL80211_IFTYPE_MONITOR: 1791 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1792 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1793 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1794 MONITOR_FLAG_OTHER_BSS; 1795 break; 1796 case NL80211_IFTYPE_NAN: 1797 idr_init(&sdata->u.nan.function_inst_ids); 1798 spin_lock_init(&sdata->u.nan.func_lock); 1799 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1800 break; 1801 case NL80211_IFTYPE_AP_VLAN: 1802 case NL80211_IFTYPE_P2P_DEVICE: 1803 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1804 break; 1805 case NL80211_IFTYPE_UNSPECIFIED: 1806 case NL80211_IFTYPE_WDS: 1807 case NUM_NL80211_IFTYPES: 1808 WARN_ON(1); 1809 break; 1810 } 1811 1812 /* need to do this after the switch so vif.type is correct */ 1813 ieee80211_link_setup(&sdata->deflink); 1814 1815 ieee80211_debugfs_recreate_netdev(sdata, false); 1816 } 1817 1818 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1819 enum nl80211_iftype type) 1820 { 1821 struct ieee80211_local *local = sdata->local; 1822 int ret, err; 1823 enum nl80211_iftype internal_type = type; 1824 bool p2p = false; 1825 1826 ASSERT_RTNL(); 1827 1828 if (!local->ops->change_interface) 1829 return -EBUSY; 1830 1831 /* for now, don't support changing while links exist */ 1832 if (ieee80211_vif_is_mld(&sdata->vif)) 1833 return -EBUSY; 1834 1835 switch (sdata->vif.type) { 1836 case NL80211_IFTYPE_AP: 1837 if (!list_empty(&sdata->u.ap.vlans)) 1838 return -EBUSY; 1839 break; 1840 case NL80211_IFTYPE_STATION: 1841 case NL80211_IFTYPE_ADHOC: 1842 case NL80211_IFTYPE_OCB: 1843 /* 1844 * Could maybe also all others here? 1845 * Just not sure how that interacts 1846 * with the RX/config path e.g. for 1847 * mesh. 1848 */ 1849 break; 1850 default: 1851 return -EBUSY; 1852 } 1853 1854 switch (type) { 1855 case NL80211_IFTYPE_AP: 1856 case NL80211_IFTYPE_STATION: 1857 case NL80211_IFTYPE_ADHOC: 1858 case NL80211_IFTYPE_OCB: 1859 /* 1860 * Could probably support everything 1861 * but here. 1862 */ 1863 break; 1864 case NL80211_IFTYPE_P2P_CLIENT: 1865 p2p = true; 1866 internal_type = NL80211_IFTYPE_STATION; 1867 break; 1868 case NL80211_IFTYPE_P2P_GO: 1869 p2p = true; 1870 internal_type = NL80211_IFTYPE_AP; 1871 break; 1872 default: 1873 return -EBUSY; 1874 } 1875 1876 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1877 if (ret) 1878 return ret; 1879 1880 ieee80211_stop_vif_queues(local, sdata, 1881 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1882 /* do_stop will synchronize_rcu() first thing */ 1883 ieee80211_do_stop(sdata, false); 1884 1885 ieee80211_teardown_sdata(sdata); 1886 1887 ieee80211_set_sdata_offload_flags(sdata); 1888 ret = drv_change_interface(local, sdata, internal_type, p2p); 1889 if (ret) 1890 type = ieee80211_vif_type_p2p(&sdata->vif); 1891 1892 /* 1893 * Ignore return value here, there's not much we can do since 1894 * the driver changed the interface type internally already. 1895 * The warnings will hopefully make driver authors fix it :-) 1896 */ 1897 ieee80211_check_queues(sdata, type); 1898 1899 ieee80211_setup_sdata(sdata, type); 1900 ieee80211_set_vif_encap_ops(sdata); 1901 1902 err = ieee80211_do_open(&sdata->wdev, false); 1903 WARN(err, "type change: do_open returned %d", err); 1904 1905 ieee80211_wake_vif_queues(local, sdata, 1906 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1907 return ret; 1908 } 1909 1910 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1911 enum nl80211_iftype type) 1912 { 1913 int ret; 1914 1915 ASSERT_RTNL(); 1916 1917 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1918 return 0; 1919 1920 if (ieee80211_sdata_running(sdata)) { 1921 ret = ieee80211_runtime_change_iftype(sdata, type); 1922 if (ret) 1923 return ret; 1924 } else { 1925 /* Purge and reset type-dependent state. */ 1926 ieee80211_teardown_sdata(sdata); 1927 ieee80211_setup_sdata(sdata, type); 1928 } 1929 1930 /* reset some values that shouldn't be kept across type changes */ 1931 if (type == NL80211_IFTYPE_STATION) 1932 sdata->u.mgd.use_4addr = false; 1933 1934 return 0; 1935 } 1936 1937 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1938 u8 *perm_addr, enum nl80211_iftype type) 1939 { 1940 struct ieee80211_sub_if_data *sdata; 1941 u64 mask, start, addr, val, inc; 1942 u8 *m; 1943 u8 tmp_addr[ETH_ALEN]; 1944 int i; 1945 1946 lockdep_assert_wiphy(local->hw.wiphy); 1947 1948 /* default ... something at least */ 1949 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1950 1951 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1952 local->hw.wiphy->n_addresses <= 1) 1953 return; 1954 1955 switch (type) { 1956 case NL80211_IFTYPE_MONITOR: 1957 /* doesn't matter */ 1958 break; 1959 case NL80211_IFTYPE_AP_VLAN: 1960 /* match up with an AP interface */ 1961 list_for_each_entry(sdata, &local->interfaces, list) { 1962 if (sdata->vif.type != NL80211_IFTYPE_AP) 1963 continue; 1964 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1965 break; 1966 } 1967 /* keep default if no AP interface present */ 1968 break; 1969 case NL80211_IFTYPE_P2P_CLIENT: 1970 case NL80211_IFTYPE_P2P_GO: 1971 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1972 list_for_each_entry(sdata, &local->interfaces, list) { 1973 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1974 continue; 1975 if (!ieee80211_sdata_running(sdata)) 1976 continue; 1977 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1978 return; 1979 } 1980 } 1981 fallthrough; 1982 default: 1983 /* assign a new address if possible -- try n_addresses first */ 1984 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1985 bool used = false; 1986 1987 list_for_each_entry(sdata, &local->interfaces, list) { 1988 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1989 sdata->vif.addr)) { 1990 used = true; 1991 break; 1992 } 1993 } 1994 1995 if (!used) { 1996 memcpy(perm_addr, 1997 local->hw.wiphy->addresses[i].addr, 1998 ETH_ALEN); 1999 break; 2000 } 2001 } 2002 2003 /* try mask if available */ 2004 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 2005 break; 2006 2007 m = local->hw.wiphy->addr_mask; 2008 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2009 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2010 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2011 2012 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2013 /* not a contiguous mask ... not handled now! */ 2014 pr_info("not contiguous\n"); 2015 break; 2016 } 2017 2018 /* 2019 * Pick address of existing interface in case user changed 2020 * MAC address manually, default to perm_addr. 2021 */ 2022 m = local->hw.wiphy->perm_addr; 2023 list_for_each_entry(sdata, &local->interfaces, list) { 2024 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2025 continue; 2026 m = sdata->vif.addr; 2027 break; 2028 } 2029 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2030 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2031 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2032 2033 inc = 1ULL<<__ffs64(mask); 2034 val = (start & mask); 2035 addr = (start & ~mask) | (val & mask); 2036 do { 2037 bool used = false; 2038 2039 tmp_addr[5] = addr >> 0*8; 2040 tmp_addr[4] = addr >> 1*8; 2041 tmp_addr[3] = addr >> 2*8; 2042 tmp_addr[2] = addr >> 3*8; 2043 tmp_addr[1] = addr >> 4*8; 2044 tmp_addr[0] = addr >> 5*8; 2045 2046 val += inc; 2047 2048 list_for_each_entry(sdata, &local->interfaces, list) { 2049 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2050 used = true; 2051 break; 2052 } 2053 } 2054 2055 if (!used) { 2056 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2057 break; 2058 } 2059 addr = (start & ~mask) | (val & mask); 2060 } while (addr != start); 2061 2062 break; 2063 } 2064 } 2065 2066 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2067 unsigned char name_assign_type, 2068 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2069 struct vif_params *params) 2070 { 2071 struct net_device *ndev = NULL; 2072 struct ieee80211_sub_if_data *sdata = NULL; 2073 struct txq_info *txqi; 2074 int ret, i; 2075 2076 ASSERT_RTNL(); 2077 lockdep_assert_wiphy(local->hw.wiphy); 2078 2079 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2080 struct wireless_dev *wdev; 2081 2082 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2083 GFP_KERNEL); 2084 if (!sdata) 2085 return -ENOMEM; 2086 wdev = &sdata->wdev; 2087 2088 sdata->dev = NULL; 2089 strscpy(sdata->name, name, IFNAMSIZ); 2090 ieee80211_assign_perm_addr(local, wdev->address, type); 2091 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2092 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2093 } else { 2094 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2095 sizeof(void *)); 2096 int txq_size = 0; 2097 2098 if (type != NL80211_IFTYPE_AP_VLAN && 2099 (type != NL80211_IFTYPE_MONITOR || 2100 (params->flags & MONITOR_FLAG_ACTIVE))) 2101 txq_size += sizeof(struct txq_info) + 2102 local->hw.txq_data_size; 2103 2104 ndev = alloc_netdev_mqs(size + txq_size, 2105 name, name_assign_type, 2106 ieee80211_if_setup, 1, 1); 2107 if (!ndev) 2108 return -ENOMEM; 2109 2110 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2111 2112 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2113 2114 ndev->needed_headroom = local->tx_headroom + 2115 4*6 /* four MAC addresses */ 2116 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2117 + 6 /* mesh */ 2118 + 8 /* rfc1042/bridge tunnel */ 2119 - ETH_HLEN /* ethernet hard_header_len */ 2120 + IEEE80211_ENCRYPT_HEADROOM; 2121 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2122 2123 ret = dev_alloc_name(ndev, ndev->name); 2124 if (ret < 0) { 2125 free_netdev(ndev); 2126 return ret; 2127 } 2128 2129 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2130 if (is_valid_ether_addr(params->macaddr)) 2131 eth_hw_addr_set(ndev, params->macaddr); 2132 else 2133 eth_hw_addr_set(ndev, ndev->perm_addr); 2134 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2135 2136 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2137 sdata = netdev_priv(ndev); 2138 ndev->ieee80211_ptr = &sdata->wdev; 2139 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2140 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2141 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2142 2143 if (txq_size) { 2144 txqi = netdev_priv(ndev) + size; 2145 ieee80211_txq_init(sdata, NULL, txqi, 0); 2146 } 2147 2148 sdata->dev = ndev; 2149 } 2150 2151 /* initialise type-independent data */ 2152 sdata->wdev.wiphy = local->hw.wiphy; 2153 2154 ieee80211_sdata_init(local, sdata); 2155 2156 ieee80211_init_frag_cache(&sdata->frags); 2157 2158 INIT_LIST_HEAD(&sdata->key_list); 2159 2160 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2161 ieee80211_delayed_tailroom_dec); 2162 2163 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2164 struct ieee80211_supported_band *sband; 2165 sband = local->hw.wiphy->bands[i]; 2166 sdata->rc_rateidx_mask[i] = 2167 sband ? (1 << sband->n_bitrates) - 1 : 0; 2168 if (sband) { 2169 __le16 cap; 2170 u16 *vht_rate_mask; 2171 2172 memcpy(sdata->rc_rateidx_mcs_mask[i], 2173 sband->ht_cap.mcs.rx_mask, 2174 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2175 2176 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2177 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2178 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2179 } else { 2180 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2181 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2182 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2183 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2184 } 2185 } 2186 2187 ieee80211_set_default_queues(sdata); 2188 2189 /* setup type-dependent data */ 2190 ieee80211_setup_sdata(sdata, type); 2191 2192 if (ndev) { 2193 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2194 if (type == NL80211_IFTYPE_STATION) 2195 sdata->u.mgd.use_4addr = params->use_4addr; 2196 2197 ndev->features |= local->hw.netdev_features; 2198 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2199 ndev->hw_features |= ndev->features & 2200 MAC80211_SUPPORTED_FEATURES_TX; 2201 sdata->vif.netdev_features = local->hw.netdev_features; 2202 2203 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2204 2205 /* MTU range is normally 256 - 2304, where the upper limit is 2206 * the maximum MSDU size. Monitor interfaces send and receive 2207 * MPDU and A-MSDU frames which may be much larger so we do 2208 * not impose an upper limit in that case. 2209 */ 2210 ndev->min_mtu = 256; 2211 if (type == NL80211_IFTYPE_MONITOR) 2212 ndev->max_mtu = 0; 2213 else 2214 ndev->max_mtu = local->hw.max_mtu; 2215 2216 ret = cfg80211_register_netdevice(ndev); 2217 if (ret) { 2218 free_netdev(ndev); 2219 return ret; 2220 } 2221 } 2222 2223 mutex_lock(&local->iflist_mtx); 2224 list_add_tail_rcu(&sdata->list, &local->interfaces); 2225 mutex_unlock(&local->iflist_mtx); 2226 2227 if (new_wdev) 2228 *new_wdev = &sdata->wdev; 2229 2230 return 0; 2231 } 2232 2233 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2234 { 2235 ASSERT_RTNL(); 2236 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2237 2238 mutex_lock(&sdata->local->iflist_mtx); 2239 list_del_rcu(&sdata->list); 2240 mutex_unlock(&sdata->local->iflist_mtx); 2241 2242 if (sdata->vif.txq) 2243 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2244 2245 synchronize_rcu(); 2246 2247 cfg80211_unregister_wdev(&sdata->wdev); 2248 2249 if (!sdata->dev) { 2250 ieee80211_teardown_sdata(sdata); 2251 kfree(sdata); 2252 } 2253 } 2254 2255 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2256 { 2257 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2258 return; 2259 ieee80211_do_stop(sdata, true); 2260 } 2261 2262 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2263 { 2264 struct ieee80211_sub_if_data *sdata, *tmp; 2265 LIST_HEAD(unreg_list); 2266 2267 ASSERT_RTNL(); 2268 2269 /* Before destroying the interfaces, make sure they're all stopped so 2270 * that the hardware is stopped. Otherwise, the driver might still be 2271 * iterating the interfaces during the shutdown, e.g. from a worker 2272 * or from RX processing or similar, and if it does so (using atomic 2273 * iteration) while we're manipulating the list, the iteration will 2274 * crash. 2275 * 2276 * After this, the hardware should be stopped and the driver should 2277 * have stopped all of its activities, so that we can do RCU-unaware 2278 * manipulations of the interface list below. 2279 */ 2280 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2281 2282 wiphy_lock(local->hw.wiphy); 2283 2284 WARN(local->open_count, "%s: open count remains %d\n", 2285 wiphy_name(local->hw.wiphy), local->open_count); 2286 2287 mutex_lock(&local->iflist_mtx); 2288 list_splice_init(&local->interfaces, &unreg_list); 2289 mutex_unlock(&local->iflist_mtx); 2290 2291 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2292 bool netdev = sdata->dev; 2293 2294 /* 2295 * Remove IP addresses explicitly, since the notifier will 2296 * skip the callbacks if wdev->registered is false, since 2297 * we can't acquire the wiphy_lock() again there if already 2298 * inside this locked section. 2299 */ 2300 sdata->vif.cfg.arp_addr_cnt = 0; 2301 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2302 sdata->u.mgd.associated) 2303 ieee80211_vif_cfg_change_notify(sdata, 2304 BSS_CHANGED_ARP_FILTER); 2305 2306 list_del(&sdata->list); 2307 cfg80211_unregister_wdev(&sdata->wdev); 2308 2309 if (!netdev) 2310 kfree(sdata); 2311 } 2312 wiphy_unlock(local->hw.wiphy); 2313 } 2314 2315 static int netdev_notify(struct notifier_block *nb, 2316 unsigned long state, void *ptr) 2317 { 2318 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2319 struct ieee80211_sub_if_data *sdata; 2320 2321 if (state != NETDEV_CHANGENAME) 2322 return NOTIFY_DONE; 2323 2324 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2325 return NOTIFY_DONE; 2326 2327 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2328 return NOTIFY_DONE; 2329 2330 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2331 memcpy(sdata->name, dev->name, IFNAMSIZ); 2332 ieee80211_debugfs_rename_netdev(sdata); 2333 2334 return NOTIFY_OK; 2335 } 2336 2337 static struct notifier_block mac80211_netdev_notifier = { 2338 .notifier_call = netdev_notify, 2339 }; 2340 2341 int ieee80211_iface_init(void) 2342 { 2343 return register_netdevice_notifier(&mac80211_netdev_notifier); 2344 } 2345 2346 void ieee80211_iface_exit(void) 2347 { 2348 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2349 } 2350 2351 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2352 { 2353 if (sdata->vif.type == NL80211_IFTYPE_AP) 2354 atomic_inc(&sdata->u.ap.num_mcast_sta); 2355 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2356 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2357 } 2358 2359 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2360 { 2361 if (sdata->vif.type == NL80211_IFTYPE_AP) 2362 atomic_dec(&sdata->u.ap.num_mcast_sta); 2363 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2364 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2365 } 2366 2367 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2368 { 2369 struct ieee80211_local *local = sdata->local; 2370 2371 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2372 return; 2373 2374 ieee80211_stop_vif_queues_norefcount(local, sdata, 2375 IEEE80211_QUEUE_STOP_REASON_CSA); 2376 } 2377 2378 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2379 { 2380 struct ieee80211_local *local = sdata->local; 2381 2382 ieee80211_wake_vif_queues_norefcount(local, sdata, 2383 IEEE80211_QUEUE_STOP_REASON_CSA); 2384 } 2385