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) 2018-2023 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 wiphy_lock(local->hw.wiphy); 302 ret = _ieee80211_change_mac(sdata, addr); 303 wiphy_unlock(local->hw.wiphy); 304 305 return ret; 306 } 307 308 static inline int identical_mac_addr_allowed(int type1, int type2) 309 { 310 return type1 == NL80211_IFTYPE_MONITOR || 311 type2 == NL80211_IFTYPE_MONITOR || 312 type1 == NL80211_IFTYPE_P2P_DEVICE || 313 type2 == NL80211_IFTYPE_P2P_DEVICE || 314 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 315 (type1 == NL80211_IFTYPE_AP_VLAN && 316 (type2 == NL80211_IFTYPE_AP || 317 type2 == NL80211_IFTYPE_AP_VLAN)); 318 } 319 320 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 321 enum nl80211_iftype iftype) 322 { 323 struct ieee80211_local *local = sdata->local; 324 struct ieee80211_sub_if_data *nsdata; 325 326 ASSERT_RTNL(); 327 lockdep_assert_wiphy(local->hw.wiphy); 328 329 /* we hold the RTNL here so can safely walk the list */ 330 list_for_each_entry(nsdata, &local->interfaces, list) { 331 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 332 /* 333 * Only OCB and monitor mode may coexist 334 */ 335 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 336 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 337 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 338 nsdata->vif.type == NL80211_IFTYPE_OCB)) 339 return -EBUSY; 340 341 /* 342 * Allow only a single IBSS interface to be up at any 343 * time. This is restricted because beacon distribution 344 * cannot work properly if both are in the same IBSS. 345 * 346 * To remove this restriction we'd have to disallow them 347 * from setting the same SSID on different IBSS interfaces 348 * belonging to the same hardware. Then, however, we're 349 * faced with having to adopt two different TSF timers... 350 */ 351 if (iftype == NL80211_IFTYPE_ADHOC && 352 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 353 return -EBUSY; 354 /* 355 * will not add another interface while any channel 356 * switch is active. 357 */ 358 if (nsdata->vif.bss_conf.csa_active) 359 return -EBUSY; 360 361 /* 362 * The remaining checks are only performed for interfaces 363 * with the same MAC address. 364 */ 365 if (!ether_addr_equal(sdata->vif.addr, 366 nsdata->vif.addr)) 367 continue; 368 369 /* 370 * check whether it may have the same address 371 */ 372 if (!identical_mac_addr_allowed(iftype, 373 nsdata->vif.type)) 374 return -ENOTUNIQ; 375 376 /* No support for VLAN with MLO yet */ 377 if (iftype == NL80211_IFTYPE_AP_VLAN && 378 sdata->wdev.use_4addr && 379 nsdata->vif.type == NL80211_IFTYPE_AP && 380 nsdata->vif.valid_links) 381 return -EOPNOTSUPP; 382 383 /* 384 * can only add VLANs to enabled APs 385 */ 386 if (iftype == NL80211_IFTYPE_AP_VLAN && 387 nsdata->vif.type == NL80211_IFTYPE_AP) 388 sdata->bss = &nsdata->u.ap; 389 } 390 } 391 392 return ieee80211_check_combinations(sdata, NULL, 0, 0); 393 } 394 395 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 396 enum nl80211_iftype iftype) 397 { 398 int n_queues = sdata->local->hw.queues; 399 int i; 400 401 if (iftype == NL80211_IFTYPE_NAN) 402 return 0; 403 404 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 405 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 406 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 407 IEEE80211_INVAL_HW_QUEUE)) 408 return -EINVAL; 409 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 410 n_queues)) 411 return -EINVAL; 412 } 413 } 414 415 if ((iftype != NL80211_IFTYPE_AP && 416 iftype != NL80211_IFTYPE_P2P_GO && 417 iftype != NL80211_IFTYPE_MESH_POINT) || 418 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 419 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 420 return 0; 421 } 422 423 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 424 return -EINVAL; 425 426 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 427 return -EINVAL; 428 429 return 0; 430 } 431 432 static int ieee80211_open(struct net_device *dev) 433 { 434 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 435 int err; 436 437 /* fail early if user set an invalid address */ 438 if (!is_valid_ether_addr(dev->dev_addr)) 439 return -EADDRNOTAVAIL; 440 441 wiphy_lock(sdata->local->hw.wiphy); 442 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 443 if (err) 444 goto out; 445 446 err = ieee80211_do_open(&sdata->wdev, true); 447 out: 448 wiphy_unlock(sdata->local->hw.wiphy); 449 450 return err; 451 } 452 453 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 454 { 455 struct ieee80211_local *local = sdata->local; 456 unsigned long flags; 457 struct sk_buff *skb, *tmp; 458 u32 hw_reconf_flags = 0; 459 int i, flushed; 460 struct ps_data *ps; 461 struct cfg80211_chan_def chandef; 462 bool cancel_scan; 463 struct cfg80211_nan_func *func; 464 465 lockdep_assert_wiphy(local->hw.wiphy); 466 467 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 468 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 469 470 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 471 if (cancel_scan) 472 ieee80211_scan_cancel(local); 473 474 ieee80211_roc_purge(local, sdata); 475 476 switch (sdata->vif.type) { 477 case NL80211_IFTYPE_STATION: 478 ieee80211_mgd_stop(sdata); 479 break; 480 case NL80211_IFTYPE_ADHOC: 481 ieee80211_ibss_stop(sdata); 482 break; 483 case NL80211_IFTYPE_MONITOR: 484 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 485 break; 486 list_del_rcu(&sdata->u.mntr.list); 487 break; 488 default: 489 break; 490 } 491 492 /* 493 * Remove all stations associated with this interface. 494 * 495 * This must be done before calling ops->remove_interface() 496 * because otherwise we can later invoke ops->sta_notify() 497 * whenever the STAs are removed, and that invalidates driver 498 * assumptions about always getting a vif pointer that is valid 499 * (because if we remove a STA after ops->remove_interface() 500 * the driver will have removed the vif info already!) 501 * 502 * For AP_VLANs stations may exist since there's nothing else that 503 * would have removed them, but in other modes there shouldn't 504 * be any stations. 505 */ 506 flushed = sta_info_flush(sdata); 507 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 508 509 /* don't count this interface for allmulti while it is down */ 510 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 511 atomic_dec(&local->iff_allmultis); 512 513 if (sdata->vif.type == NL80211_IFTYPE_AP) { 514 local->fif_pspoll--; 515 local->fif_probe_req--; 516 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 517 local->fif_probe_req--; 518 } 519 520 if (sdata->dev) { 521 netif_addr_lock_bh(sdata->dev); 522 spin_lock_bh(&local->filter_lock); 523 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 524 sdata->dev->addr_len); 525 spin_unlock_bh(&local->filter_lock); 526 netif_addr_unlock_bh(sdata->dev); 527 } 528 529 del_timer_sync(&local->dynamic_ps_timer); 530 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 531 532 WARN(ieee80211_vif_is_mld(&sdata->vif), 533 "destroying interface with valid links 0x%04x\n", 534 sdata->vif.valid_links); 535 536 sdata->vif.bss_conf.csa_active = false; 537 if (sdata->vif.type == NL80211_IFTYPE_STATION) 538 sdata->deflink.u.mgd.csa_waiting_bcn = false; 539 if (sdata->deflink.csa_block_tx) { 540 ieee80211_wake_vif_queues(local, sdata, 541 IEEE80211_QUEUE_STOP_REASON_CSA); 542 sdata->deflink.csa_block_tx = false; 543 } 544 545 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa_finalize_work); 546 wiphy_work_cancel(local->hw.wiphy, 547 &sdata->deflink.color_change_finalize_work); 548 wiphy_delayed_work_cancel(local->hw.wiphy, 549 &sdata->deflink.dfs_cac_timer_work); 550 551 if (sdata->wdev.cac_started) { 552 chandef = sdata->vif.bss_conf.chandef; 553 WARN_ON(local->suspended); 554 ieee80211_link_release_channel(&sdata->deflink); 555 cfg80211_cac_event(sdata->dev, &chandef, 556 NL80211_RADAR_CAC_ABORTED, 557 GFP_KERNEL); 558 } 559 560 if (sdata->vif.type == NL80211_IFTYPE_AP) { 561 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 562 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 563 /* remove all packets in parent bc_buf pointing to this dev */ 564 ps = &sdata->bss->ps; 565 566 spin_lock_irqsave(&ps->bc_buf.lock, flags); 567 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 568 if (skb->dev == sdata->dev) { 569 __skb_unlink(skb, &ps->bc_buf); 570 local->total_ps_buffered--; 571 ieee80211_free_txskb(&local->hw, skb); 572 } 573 } 574 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 575 } 576 577 if (going_down) 578 local->open_count--; 579 580 switch (sdata->vif.type) { 581 case NL80211_IFTYPE_AP_VLAN: 582 list_del(&sdata->u.vlan.list); 583 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 584 /* see comment in the default case below */ 585 ieee80211_free_keys(sdata, true); 586 /* no need to tell driver */ 587 break; 588 case NL80211_IFTYPE_MONITOR: 589 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 590 local->cooked_mntrs--; 591 break; 592 } 593 594 local->monitors--; 595 if (local->monitors == 0) { 596 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 597 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 598 } 599 600 ieee80211_adjust_monitor_flags(sdata, -1); 601 break; 602 case NL80211_IFTYPE_NAN: 603 /* clean all the functions */ 604 spin_lock_bh(&sdata->u.nan.func_lock); 605 606 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 607 idr_remove(&sdata->u.nan.function_inst_ids, i); 608 cfg80211_free_nan_func(func); 609 } 610 idr_destroy(&sdata->u.nan.function_inst_ids); 611 612 spin_unlock_bh(&sdata->u.nan.func_lock); 613 break; 614 case NL80211_IFTYPE_P2P_DEVICE: 615 /* relies on synchronize_rcu() below */ 616 RCU_INIT_POINTER(local->p2p_sdata, NULL); 617 fallthrough; 618 default: 619 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 620 /* 621 * When we get here, the interface is marked down. 622 * Free the remaining keys, if there are any 623 * (which can happen in AP mode if userspace sets 624 * keys before the interface is operating) 625 * 626 * Force the key freeing to always synchronize_net() 627 * to wait for the RX path in case it is using this 628 * interface enqueuing frames at this very time on 629 * another CPU. 630 */ 631 ieee80211_free_keys(sdata, true); 632 skb_queue_purge(&sdata->skb_queue); 633 skb_queue_purge(&sdata->status_queue); 634 } 635 636 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 637 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 638 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 639 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 640 if (info->control.vif == &sdata->vif) { 641 __skb_unlink(skb, &local->pending[i]); 642 ieee80211_free_txskb(&local->hw, skb); 643 } 644 } 645 } 646 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 647 648 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 649 ieee80211_txq_remove_vlan(local, sdata); 650 651 sdata->bss = NULL; 652 653 if (local->open_count == 0) 654 ieee80211_clear_tx_pending(local); 655 656 sdata->vif.bss_conf.beacon_int = 0; 657 658 /* 659 * If the interface goes down while suspended, presumably because 660 * the device was unplugged and that happens before our resume, 661 * then the driver is already unconfigured and the remainder of 662 * this function isn't needed. 663 * XXX: what about WoWLAN? If the device has software state, e.g. 664 * memory allocated, it might expect teardown commands from 665 * mac80211 here? 666 */ 667 if (local->suspended) { 668 WARN_ON(local->wowlan); 669 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 670 return; 671 } 672 673 switch (sdata->vif.type) { 674 case NL80211_IFTYPE_AP_VLAN: 675 break; 676 case NL80211_IFTYPE_MONITOR: 677 if (local->monitors == 0) 678 ieee80211_del_virtual_monitor(local); 679 680 ieee80211_recalc_idle(local); 681 682 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 683 break; 684 685 fallthrough; 686 default: 687 if (going_down) 688 drv_remove_interface(local, sdata); 689 } 690 691 ieee80211_recalc_ps(local); 692 693 if (cancel_scan) 694 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 695 696 if (local->open_count == 0) { 697 ieee80211_stop_device(local); 698 699 /* no reconfiguring after stop! */ 700 return; 701 } 702 703 /* do after stop to avoid reconfiguring when we stop anyway */ 704 ieee80211_configure_filter(local); 705 ieee80211_hw_config(local, hw_reconf_flags); 706 707 if (local->monitors == local->open_count) 708 ieee80211_add_virtual_monitor(local); 709 } 710 711 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 712 { 713 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 714 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 715 716 if (!tx_vif) 717 return; 718 719 tx_sdata = vif_to_sdata(tx_vif); 720 sdata->vif.mbssid_tx_vif = NULL; 721 722 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 723 &tx_sdata->local->interfaces, list) { 724 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 725 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 726 ieee80211_sdata_running(non_tx_sdata)) { 727 non_tx_sdata->vif.mbssid_tx_vif = NULL; 728 dev_close(non_tx_sdata->wdev.netdev); 729 } 730 } 731 732 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 733 tx_sdata->vif.mbssid_tx_vif = NULL; 734 dev_close(tx_sdata->wdev.netdev); 735 } 736 } 737 738 static int ieee80211_stop(struct net_device *dev) 739 { 740 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 741 742 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 743 if (sdata->vif.type == NL80211_IFTYPE_AP) { 744 struct ieee80211_sub_if_data *vlan, *tmpsdata; 745 746 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 747 u.vlan.list) 748 dev_close(vlan->dev); 749 750 ieee80211_stop_mbssid(sdata); 751 } 752 753 wiphy_lock(sdata->local->hw.wiphy); 754 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 755 756 ieee80211_do_stop(sdata, true); 757 wiphy_unlock(sdata->local->hw.wiphy); 758 759 return 0; 760 } 761 762 static void ieee80211_set_multicast_list(struct net_device *dev) 763 { 764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 765 struct ieee80211_local *local = sdata->local; 766 int allmulti, sdata_allmulti; 767 768 allmulti = !!(dev->flags & IFF_ALLMULTI); 769 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 770 771 if (allmulti != sdata_allmulti) { 772 if (dev->flags & IFF_ALLMULTI) 773 atomic_inc(&local->iff_allmultis); 774 else 775 atomic_dec(&local->iff_allmultis); 776 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 777 } 778 779 spin_lock_bh(&local->filter_lock); 780 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 781 spin_unlock_bh(&local->filter_lock); 782 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 783 } 784 785 /* 786 * Called when the netdev is removed or, by the code below, before 787 * the interface type changes. 788 */ 789 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 790 { 791 /* free extra data */ 792 ieee80211_free_keys(sdata, false); 793 794 ieee80211_debugfs_remove_netdev(sdata); 795 796 ieee80211_destroy_frag_cache(&sdata->frags); 797 798 if (ieee80211_vif_is_mesh(&sdata->vif)) 799 ieee80211_mesh_teardown_sdata(sdata); 800 801 ieee80211_vif_clear_links(sdata); 802 ieee80211_link_stop(&sdata->deflink); 803 } 804 805 static void ieee80211_uninit(struct net_device *dev) 806 { 807 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 808 } 809 810 static void 811 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 812 { 813 dev_fetch_sw_netstats(stats, dev->tstats); 814 } 815 816 static int ieee80211_netdev_setup_tc(struct net_device *dev, 817 enum tc_setup_type type, void *type_data) 818 { 819 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 820 struct ieee80211_local *local = sdata->local; 821 822 return drv_net_setup_tc(local, sdata, dev, type, type_data); 823 } 824 825 static const struct net_device_ops ieee80211_dataif_ops = { 826 .ndo_open = ieee80211_open, 827 .ndo_stop = ieee80211_stop, 828 .ndo_uninit = ieee80211_uninit, 829 .ndo_start_xmit = ieee80211_subif_start_xmit, 830 .ndo_set_rx_mode = ieee80211_set_multicast_list, 831 .ndo_set_mac_address = ieee80211_change_mac, 832 .ndo_get_stats64 = ieee80211_get_stats64, 833 .ndo_setup_tc = ieee80211_netdev_setup_tc, 834 }; 835 836 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 837 struct sk_buff *skb, 838 struct net_device *sb_dev) 839 { 840 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 841 struct ieee80211_local *local = sdata->local; 842 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 843 struct ieee80211_hdr *hdr; 844 int len_rthdr; 845 846 if (local->hw.queues < IEEE80211_NUM_ACS) 847 return 0; 848 849 /* reset flags and info before parsing radiotap header */ 850 memset(info, 0, sizeof(*info)); 851 852 if (!ieee80211_parse_tx_radiotap(skb, dev)) 853 return 0; /* doesn't matter, frame will be dropped */ 854 855 len_rthdr = ieee80211_get_radiotap_len(skb->data); 856 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 857 if (skb->len < len_rthdr + 2 || 858 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 859 return 0; /* doesn't matter, frame will be dropped */ 860 861 return ieee80211_select_queue_80211(sdata, skb, hdr); 862 } 863 864 static const struct net_device_ops ieee80211_monitorif_ops = { 865 .ndo_open = ieee80211_open, 866 .ndo_stop = ieee80211_stop, 867 .ndo_uninit = ieee80211_uninit, 868 .ndo_start_xmit = ieee80211_monitor_start_xmit, 869 .ndo_set_rx_mode = ieee80211_set_multicast_list, 870 .ndo_set_mac_address = ieee80211_change_mac, 871 .ndo_select_queue = ieee80211_monitor_select_queue, 872 .ndo_get_stats64 = ieee80211_get_stats64, 873 }; 874 875 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 876 struct net_device_path *path) 877 { 878 struct ieee80211_sub_if_data *sdata; 879 struct ieee80211_local *local; 880 struct sta_info *sta; 881 int ret = -ENOENT; 882 883 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 884 local = sdata->local; 885 886 if (!local->ops->net_fill_forward_path) 887 return -EOPNOTSUPP; 888 889 rcu_read_lock(); 890 switch (sdata->vif.type) { 891 case NL80211_IFTYPE_AP_VLAN: 892 sta = rcu_dereference(sdata->u.vlan.sta); 893 if (sta) 894 break; 895 if (sdata->wdev.use_4addr) 896 goto out; 897 if (is_multicast_ether_addr(ctx->daddr)) 898 goto out; 899 sta = sta_info_get_bss(sdata, ctx->daddr); 900 break; 901 case NL80211_IFTYPE_AP: 902 if (is_multicast_ether_addr(ctx->daddr)) 903 goto out; 904 sta = sta_info_get(sdata, ctx->daddr); 905 break; 906 case NL80211_IFTYPE_STATION: 907 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 908 sta = sta_info_get(sdata, ctx->daddr); 909 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 910 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 911 goto out; 912 913 break; 914 } 915 } 916 917 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 918 break; 919 default: 920 goto out; 921 } 922 923 if (!sta) 924 goto out; 925 926 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 927 out: 928 rcu_read_unlock(); 929 930 return ret; 931 } 932 933 static const struct net_device_ops ieee80211_dataif_8023_ops = { 934 .ndo_open = ieee80211_open, 935 .ndo_stop = ieee80211_stop, 936 .ndo_uninit = ieee80211_uninit, 937 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 938 .ndo_set_rx_mode = ieee80211_set_multicast_list, 939 .ndo_set_mac_address = ieee80211_change_mac, 940 .ndo_get_stats64 = ieee80211_get_stats64, 941 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 942 .ndo_setup_tc = ieee80211_netdev_setup_tc, 943 }; 944 945 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 946 { 947 switch (iftype) { 948 /* P2P GO and client are mapped to AP/STATION types */ 949 case NL80211_IFTYPE_AP: 950 case NL80211_IFTYPE_STATION: 951 return true; 952 default: 953 return false; 954 } 955 } 956 957 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 958 { 959 struct ieee80211_local *local = sdata->local; 960 u32 flags; 961 962 flags = sdata->vif.offload_flags; 963 964 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 965 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 966 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 967 968 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 969 local->hw.wiphy->frag_threshold != (u32)-1) 970 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 971 972 if (local->monitors) 973 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 974 } else { 975 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 976 } 977 978 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 979 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 980 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 981 982 if (local->monitors && 983 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 984 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 985 } else { 986 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 987 } 988 989 if (sdata->vif.offload_flags == flags) 990 return false; 991 992 sdata->vif.offload_flags = flags; 993 ieee80211_check_fast_rx_iface(sdata); 994 return true; 995 } 996 997 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 998 { 999 struct ieee80211_local *local = sdata->local; 1000 struct ieee80211_sub_if_data *bss = sdata; 1001 bool enabled; 1002 1003 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1004 if (!sdata->bss) 1005 return; 1006 1007 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1008 } 1009 1010 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1011 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1012 return; 1013 1014 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1015 if (sdata->wdev.use_4addr && 1016 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1017 enabled = false; 1018 1019 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1020 &ieee80211_dataif_ops; 1021 } 1022 1023 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1024 { 1025 struct ieee80211_local *local = sdata->local; 1026 struct ieee80211_sub_if_data *vsdata; 1027 1028 if (ieee80211_set_sdata_offload_flags(sdata)) { 1029 drv_update_vif_offload(local, sdata); 1030 ieee80211_set_vif_encap_ops(sdata); 1031 } 1032 1033 list_for_each_entry(vsdata, &local->interfaces, list) { 1034 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1035 vsdata->bss != &sdata->u.ap) 1036 continue; 1037 1038 ieee80211_set_vif_encap_ops(vsdata); 1039 } 1040 } 1041 1042 void ieee80211_recalc_offload(struct ieee80211_local *local) 1043 { 1044 struct ieee80211_sub_if_data *sdata; 1045 1046 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1047 return; 1048 1049 lockdep_assert_wiphy(local->hw.wiphy); 1050 1051 list_for_each_entry(sdata, &local->interfaces, list) { 1052 if (!ieee80211_sdata_running(sdata)) 1053 continue; 1054 1055 ieee80211_recalc_sdata_offload(sdata); 1056 } 1057 } 1058 1059 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1060 const int offset) 1061 { 1062 struct ieee80211_local *local = sdata->local; 1063 u32 flags = sdata->u.mntr.flags; 1064 1065 #define ADJUST(_f, _s) do { \ 1066 if (flags & MONITOR_FLAG_##_f) \ 1067 local->fif_##_s += offset; \ 1068 } while (0) 1069 1070 ADJUST(FCSFAIL, fcsfail); 1071 ADJUST(PLCPFAIL, plcpfail); 1072 ADJUST(CONTROL, control); 1073 ADJUST(CONTROL, pspoll); 1074 ADJUST(OTHER_BSS, other_bss); 1075 1076 #undef ADJUST 1077 } 1078 1079 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1080 { 1081 struct ieee80211_local *local = sdata->local; 1082 int i; 1083 1084 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1085 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1086 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1087 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1088 sdata->vif.hw_queue[i] = i; 1089 else 1090 sdata->vif.hw_queue[i] = 0; 1091 } 1092 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1093 } 1094 1095 static void ieee80211_sdata_init(struct ieee80211_local *local, 1096 struct ieee80211_sub_if_data *sdata) 1097 { 1098 sdata->local = local; 1099 1100 /* 1101 * Initialize the default link, so we can use link_id 0 for non-MLD, 1102 * and that continues to work for non-MLD-aware drivers that use just 1103 * vif.bss_conf instead of vif.link_conf. 1104 * 1105 * Note that we never change this, so if link ID 0 isn't used in an 1106 * MLD connection, we get a separate allocation for it. 1107 */ 1108 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1109 } 1110 1111 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1112 { 1113 struct ieee80211_sub_if_data *sdata; 1114 int ret; 1115 1116 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1117 return 0; 1118 1119 ASSERT_RTNL(); 1120 lockdep_assert_wiphy(local->hw.wiphy); 1121 1122 if (local->monitor_sdata) 1123 return 0; 1124 1125 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1126 if (!sdata) 1127 return -ENOMEM; 1128 1129 /* set up data */ 1130 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1131 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1132 wiphy_name(local->hw.wiphy)); 1133 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1134 sdata->wdev.wiphy = local->hw.wiphy; 1135 1136 ieee80211_sdata_init(local, sdata); 1137 1138 ieee80211_set_default_queues(sdata); 1139 1140 ret = drv_add_interface(local, sdata); 1141 if (WARN_ON(ret)) { 1142 /* ok .. stupid driver, it asked for this! */ 1143 kfree(sdata); 1144 return ret; 1145 } 1146 1147 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1148 1149 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1150 if (ret) { 1151 kfree(sdata); 1152 return ret; 1153 } 1154 1155 mutex_lock(&local->iflist_mtx); 1156 rcu_assign_pointer(local->monitor_sdata, sdata); 1157 mutex_unlock(&local->iflist_mtx); 1158 1159 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef, 1160 IEEE80211_CHANCTX_EXCLUSIVE); 1161 if (ret) { 1162 mutex_lock(&local->iflist_mtx); 1163 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1164 mutex_unlock(&local->iflist_mtx); 1165 synchronize_net(); 1166 drv_remove_interface(local, sdata); 1167 kfree(sdata); 1168 return ret; 1169 } 1170 1171 skb_queue_head_init(&sdata->skb_queue); 1172 skb_queue_head_init(&sdata->status_queue); 1173 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1174 1175 return 0; 1176 } 1177 1178 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1179 { 1180 struct ieee80211_sub_if_data *sdata; 1181 1182 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1183 return; 1184 1185 ASSERT_RTNL(); 1186 lockdep_assert_wiphy(local->hw.wiphy); 1187 1188 mutex_lock(&local->iflist_mtx); 1189 1190 sdata = rcu_dereference_protected(local->monitor_sdata, 1191 lockdep_is_held(&local->iflist_mtx)); 1192 if (!sdata) { 1193 mutex_unlock(&local->iflist_mtx); 1194 return; 1195 } 1196 1197 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1198 mutex_unlock(&local->iflist_mtx); 1199 1200 synchronize_net(); 1201 1202 ieee80211_link_release_channel(&sdata->deflink); 1203 1204 drv_remove_interface(local, sdata); 1205 1206 kfree(sdata); 1207 } 1208 1209 /* 1210 * NOTE: Be very careful when changing this function, it must NOT return 1211 * an error on interface type changes that have been pre-checked, so most 1212 * checks should be in ieee80211_check_concurrent_iface. 1213 */ 1214 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1215 { 1216 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1217 struct net_device *dev = wdev->netdev; 1218 struct ieee80211_local *local = sdata->local; 1219 u64 changed = 0; 1220 int res; 1221 u32 hw_reconf_flags = 0; 1222 1223 lockdep_assert_wiphy(local->hw.wiphy); 1224 1225 switch (sdata->vif.type) { 1226 case NL80211_IFTYPE_AP_VLAN: { 1227 struct ieee80211_sub_if_data *master; 1228 1229 if (!sdata->bss) 1230 return -ENOLINK; 1231 1232 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1233 1234 master = container_of(sdata->bss, 1235 struct ieee80211_sub_if_data, u.ap); 1236 sdata->control_port_protocol = 1237 master->control_port_protocol; 1238 sdata->control_port_no_encrypt = 1239 master->control_port_no_encrypt; 1240 sdata->control_port_over_nl80211 = 1241 master->control_port_over_nl80211; 1242 sdata->control_port_no_preauth = 1243 master->control_port_no_preauth; 1244 sdata->vif.cab_queue = master->vif.cab_queue; 1245 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1246 sizeof(sdata->vif.hw_queue)); 1247 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 1248 1249 sdata->crypto_tx_tailroom_needed_cnt += 1250 master->crypto_tx_tailroom_needed_cnt; 1251 1252 break; 1253 } 1254 case NL80211_IFTYPE_AP: 1255 sdata->bss = &sdata->u.ap; 1256 break; 1257 case NL80211_IFTYPE_MESH_POINT: 1258 case NL80211_IFTYPE_STATION: 1259 case NL80211_IFTYPE_MONITOR: 1260 case NL80211_IFTYPE_ADHOC: 1261 case NL80211_IFTYPE_P2P_DEVICE: 1262 case NL80211_IFTYPE_OCB: 1263 case NL80211_IFTYPE_NAN: 1264 /* no special treatment */ 1265 break; 1266 case NL80211_IFTYPE_UNSPECIFIED: 1267 case NUM_NL80211_IFTYPES: 1268 case NL80211_IFTYPE_P2P_CLIENT: 1269 case NL80211_IFTYPE_P2P_GO: 1270 case NL80211_IFTYPE_WDS: 1271 /* cannot happen */ 1272 WARN_ON(1); 1273 break; 1274 } 1275 1276 if (local->open_count == 0) { 1277 /* here we can consider everything in good order (again) */ 1278 local->reconfig_failure = false; 1279 1280 res = drv_start(local); 1281 if (res) 1282 goto err_del_bss; 1283 /* we're brought up, everything changes */ 1284 hw_reconf_flags = ~0; 1285 ieee80211_led_radio(local, true); 1286 ieee80211_mod_tpt_led_trig(local, 1287 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1288 } 1289 1290 /* 1291 * Copy the hopefully now-present MAC address to 1292 * this interface, if it has the special null one. 1293 */ 1294 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1295 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1296 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1297 1298 if (!is_valid_ether_addr(dev->dev_addr)) { 1299 res = -EADDRNOTAVAIL; 1300 goto err_stop; 1301 } 1302 } 1303 1304 switch (sdata->vif.type) { 1305 case NL80211_IFTYPE_AP_VLAN: 1306 /* no need to tell driver, but set carrier and chanctx */ 1307 if (sdata->bss->active) { 1308 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1309 netif_carrier_on(dev); 1310 ieee80211_set_vif_encap_ops(sdata); 1311 } else { 1312 netif_carrier_off(dev); 1313 } 1314 break; 1315 case NL80211_IFTYPE_MONITOR: 1316 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1317 local->cooked_mntrs++; 1318 break; 1319 } 1320 1321 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1322 res = drv_add_interface(local, sdata); 1323 if (res) 1324 goto err_stop; 1325 } else if (local->monitors == 0 && local->open_count == 0) { 1326 res = ieee80211_add_virtual_monitor(local); 1327 if (res) 1328 goto err_stop; 1329 } 1330 1331 /* must be before the call to ieee80211_configure_filter */ 1332 local->monitors++; 1333 if (local->monitors == 1) { 1334 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1335 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1336 } 1337 1338 ieee80211_adjust_monitor_flags(sdata, 1); 1339 ieee80211_configure_filter(local); 1340 ieee80211_recalc_offload(local); 1341 ieee80211_recalc_idle(local); 1342 1343 netif_carrier_on(dev); 1344 break; 1345 default: 1346 if (coming_up) { 1347 ieee80211_del_virtual_monitor(local); 1348 ieee80211_set_sdata_offload_flags(sdata); 1349 1350 res = drv_add_interface(local, sdata); 1351 if (res) 1352 goto err_stop; 1353 1354 ieee80211_set_vif_encap_ops(sdata); 1355 res = ieee80211_check_queues(sdata, 1356 ieee80211_vif_type_p2p(&sdata->vif)); 1357 if (res) 1358 goto err_del_interface; 1359 } 1360 1361 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1362 local->fif_pspoll++; 1363 local->fif_probe_req++; 1364 1365 ieee80211_configure_filter(local); 1366 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1367 local->fif_probe_req++; 1368 } 1369 1370 if (sdata->vif.probe_req_reg) 1371 drv_config_iface_filter(local, sdata, 1372 FIF_PROBE_REQ, 1373 FIF_PROBE_REQ); 1374 1375 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1376 sdata->vif.type != NL80211_IFTYPE_NAN) 1377 changed |= ieee80211_reset_erp_info(sdata); 1378 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1379 changed); 1380 1381 switch (sdata->vif.type) { 1382 case NL80211_IFTYPE_STATION: 1383 case NL80211_IFTYPE_ADHOC: 1384 case NL80211_IFTYPE_AP: 1385 case NL80211_IFTYPE_MESH_POINT: 1386 case NL80211_IFTYPE_OCB: 1387 netif_carrier_off(dev); 1388 break; 1389 case NL80211_IFTYPE_P2P_DEVICE: 1390 case NL80211_IFTYPE_NAN: 1391 break; 1392 default: 1393 /* not reached */ 1394 WARN_ON(1); 1395 } 1396 1397 /* 1398 * Set default queue parameters so drivers don't 1399 * need to initialise the hardware if the hardware 1400 * doesn't start up with sane defaults. 1401 * Enable QoS for anything but station interfaces. 1402 */ 1403 ieee80211_set_wmm_default(&sdata->deflink, true, 1404 sdata->vif.type != NL80211_IFTYPE_STATION); 1405 } 1406 1407 switch (sdata->vif.type) { 1408 case NL80211_IFTYPE_P2P_DEVICE: 1409 rcu_assign_pointer(local->p2p_sdata, sdata); 1410 break; 1411 case NL80211_IFTYPE_MONITOR: 1412 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1413 break; 1414 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1415 break; 1416 default: 1417 break; 1418 } 1419 1420 /* 1421 * set_multicast_list will be invoked by the networking core 1422 * which will check whether any increments here were done in 1423 * error and sync them down to the hardware as filter flags. 1424 */ 1425 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1426 atomic_inc(&local->iff_allmultis); 1427 1428 if (coming_up) 1429 local->open_count++; 1430 1431 if (hw_reconf_flags) 1432 ieee80211_hw_config(local, hw_reconf_flags); 1433 1434 ieee80211_recalc_ps(local); 1435 1436 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1437 1438 return 0; 1439 err_del_interface: 1440 drv_remove_interface(local, sdata); 1441 err_stop: 1442 if (!local->open_count) 1443 drv_stop(local); 1444 err_del_bss: 1445 sdata->bss = NULL; 1446 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1447 list_del(&sdata->u.vlan.list); 1448 /* might already be clear but that doesn't matter */ 1449 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1450 return res; 1451 } 1452 1453 static void ieee80211_if_free(struct net_device *dev) 1454 { 1455 free_percpu(dev->tstats); 1456 } 1457 1458 static void ieee80211_if_setup(struct net_device *dev) 1459 { 1460 ether_setup(dev); 1461 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1462 dev->priv_flags |= IFF_NO_QUEUE; 1463 dev->netdev_ops = &ieee80211_dataif_ops; 1464 dev->needs_free_netdev = true; 1465 dev->priv_destructor = ieee80211_if_free; 1466 } 1467 1468 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1469 struct ieee80211_sub_if_data *sdata, 1470 struct sk_buff *skb) 1471 { 1472 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1473 1474 lockdep_assert_wiphy(local->hw.wiphy); 1475 1476 if (ieee80211_is_action(mgmt->frame_control) && 1477 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1478 struct sta_info *sta; 1479 int len = skb->len; 1480 1481 sta = sta_info_get_bss(sdata, mgmt->sa); 1482 if (sta) { 1483 switch (mgmt->u.action.u.addba_req.action_code) { 1484 case WLAN_ACTION_ADDBA_REQ: 1485 ieee80211_process_addba_request(local, sta, 1486 mgmt, len); 1487 break; 1488 case WLAN_ACTION_ADDBA_RESP: 1489 ieee80211_process_addba_resp(local, sta, 1490 mgmt, len); 1491 break; 1492 case WLAN_ACTION_DELBA: 1493 ieee80211_process_delba(sdata, sta, 1494 mgmt, len); 1495 break; 1496 default: 1497 WARN_ON(1); 1498 break; 1499 } 1500 } 1501 } else if (ieee80211_is_action(mgmt->frame_control) && 1502 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1503 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1504 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1505 struct ieee80211_rx_status *status; 1506 enum nl80211_band band; 1507 struct sta_info *sta; 1508 u8 opmode; 1509 1510 status = IEEE80211_SKB_RXCB(skb); 1511 band = status->band; 1512 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1513 1514 sta = sta_info_get_bss(sdata, mgmt->sa); 1515 1516 if (sta) 1517 ieee80211_vht_handle_opmode(sdata, 1518 &sta->deflink, 1519 opmode, band); 1520 1521 break; 1522 } 1523 case WLAN_VHT_ACTION_GROUPID_MGMT: 1524 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1525 mgmt); 1526 break; 1527 default: 1528 WARN_ON(1); 1529 break; 1530 } 1531 } else if (ieee80211_is_action(mgmt->frame_control) && 1532 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1533 switch (mgmt->u.action.u.s1g.action_code) { 1534 case WLAN_S1G_TWT_TEARDOWN: 1535 case WLAN_S1G_TWT_SETUP: 1536 ieee80211_s1g_rx_twt_action(sdata, skb); 1537 break; 1538 default: 1539 break; 1540 } 1541 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1542 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1543 ieee80211_sta_rx_queued_ext(sdata, skb); 1544 else 1545 WARN_ON(1); 1546 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1547 struct ieee80211_hdr *hdr = (void *)mgmt; 1548 struct sta_info *sta; 1549 1550 /* 1551 * So the frame isn't mgmt, but frame_control 1552 * is at the right place anyway, of course, so 1553 * the if statement is correct. 1554 * 1555 * Warn if we have other data frame types here, 1556 * they must not get here. 1557 */ 1558 WARN_ON(hdr->frame_control & 1559 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1560 WARN_ON(!(hdr->seq_ctrl & 1561 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1562 /* 1563 * This was a fragment of a frame, received while 1564 * a block-ack session was active. That cannot be 1565 * right, so terminate the session. 1566 */ 1567 sta = sta_info_get_bss(sdata, mgmt->sa); 1568 if (sta) { 1569 u16 tid = ieee80211_get_tid(hdr); 1570 1571 __ieee80211_stop_rx_ba_session( 1572 sta, tid, WLAN_BACK_RECIPIENT, 1573 WLAN_REASON_QSTA_REQUIRE_SETUP, 1574 true); 1575 } 1576 } else switch (sdata->vif.type) { 1577 case NL80211_IFTYPE_STATION: 1578 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1579 break; 1580 case NL80211_IFTYPE_ADHOC: 1581 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1582 break; 1583 case NL80211_IFTYPE_MESH_POINT: 1584 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1585 break; 1586 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1587 break; 1588 default: 1589 WARN(1, "frame for unexpected interface type"); 1590 break; 1591 } 1592 } 1593 1594 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1595 struct sk_buff *skb) 1596 { 1597 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1598 1599 if (ieee80211_is_action(mgmt->frame_control) && 1600 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1601 switch (mgmt->u.action.u.s1g.action_code) { 1602 case WLAN_S1G_TWT_TEARDOWN: 1603 case WLAN_S1G_TWT_SETUP: 1604 ieee80211_s1g_status_twt_action(sdata, skb); 1605 break; 1606 default: 1607 break; 1608 } 1609 } 1610 } 1611 1612 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1613 { 1614 struct ieee80211_sub_if_data *sdata = 1615 container_of(work, struct ieee80211_sub_if_data, work); 1616 struct ieee80211_local *local = sdata->local; 1617 struct sk_buff *skb; 1618 1619 if (!ieee80211_sdata_running(sdata)) 1620 return; 1621 1622 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1623 return; 1624 1625 if (!ieee80211_can_run_worker(local)) 1626 return; 1627 1628 /* first process frames */ 1629 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1630 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1631 1632 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1633 ieee80211_process_tdls_channel_switch(sdata, skb); 1634 else 1635 ieee80211_iface_process_skb(local, sdata, skb); 1636 1637 kfree_skb(skb); 1638 kcov_remote_stop(); 1639 } 1640 1641 /* process status queue */ 1642 while ((skb = skb_dequeue(&sdata->status_queue))) { 1643 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1644 1645 ieee80211_iface_process_status(sdata, skb); 1646 kfree_skb(skb); 1647 1648 kcov_remote_stop(); 1649 } 1650 1651 /* then other type-dependent work */ 1652 switch (sdata->vif.type) { 1653 case NL80211_IFTYPE_STATION: 1654 ieee80211_sta_work(sdata); 1655 break; 1656 case NL80211_IFTYPE_ADHOC: 1657 ieee80211_ibss_work(sdata); 1658 break; 1659 case NL80211_IFTYPE_MESH_POINT: 1660 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1661 break; 1662 ieee80211_mesh_work(sdata); 1663 break; 1664 case NL80211_IFTYPE_OCB: 1665 ieee80211_ocb_work(sdata); 1666 break; 1667 default: 1668 break; 1669 } 1670 } 1671 1672 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1673 struct wiphy_work *work) 1674 { 1675 struct ieee80211_sub_if_data *sdata = 1676 container_of(work, struct ieee80211_sub_if_data, 1677 activate_links_work); 1678 1679 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1680 } 1681 1682 /* 1683 * Helper function to initialise an interface to a specific type. 1684 */ 1685 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1686 enum nl80211_iftype type) 1687 { 1688 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1689 0xff, 0xff, 0xff}; 1690 1691 /* clear type-dependent unions */ 1692 memset(&sdata->u, 0, sizeof(sdata->u)); 1693 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1694 1695 /* and set some type-dependent values */ 1696 sdata->vif.type = type; 1697 sdata->vif.p2p = false; 1698 sdata->wdev.iftype = type; 1699 1700 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1701 sdata->control_port_no_encrypt = false; 1702 sdata->control_port_over_nl80211 = false; 1703 sdata->control_port_no_preauth = false; 1704 sdata->vif.cfg.idle = true; 1705 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1706 1707 sdata->noack_map = 0; 1708 1709 /* only monitor/p2p-device differ */ 1710 if (sdata->dev) { 1711 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1712 sdata->dev->type = ARPHRD_ETHER; 1713 } 1714 1715 skb_queue_head_init(&sdata->skb_queue); 1716 skb_queue_head_init(&sdata->status_queue); 1717 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1718 wiphy_work_init(&sdata->activate_links_work, 1719 ieee80211_activate_links_work); 1720 1721 switch (type) { 1722 case NL80211_IFTYPE_P2P_GO: 1723 type = NL80211_IFTYPE_AP; 1724 sdata->vif.type = type; 1725 sdata->vif.p2p = true; 1726 fallthrough; 1727 case NL80211_IFTYPE_AP: 1728 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1729 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1730 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1731 break; 1732 case NL80211_IFTYPE_P2P_CLIENT: 1733 type = NL80211_IFTYPE_STATION; 1734 sdata->vif.type = type; 1735 sdata->vif.p2p = true; 1736 fallthrough; 1737 case NL80211_IFTYPE_STATION: 1738 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1739 ieee80211_sta_setup_sdata(sdata); 1740 break; 1741 case NL80211_IFTYPE_OCB: 1742 sdata->vif.bss_conf.bssid = bssid_wildcard; 1743 ieee80211_ocb_setup_sdata(sdata); 1744 break; 1745 case NL80211_IFTYPE_ADHOC: 1746 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1747 ieee80211_ibss_setup_sdata(sdata); 1748 break; 1749 case NL80211_IFTYPE_MESH_POINT: 1750 if (ieee80211_vif_is_mesh(&sdata->vif)) 1751 ieee80211_mesh_init_sdata(sdata); 1752 break; 1753 case NL80211_IFTYPE_MONITOR: 1754 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1755 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1756 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1757 MONITOR_FLAG_OTHER_BSS; 1758 break; 1759 case NL80211_IFTYPE_NAN: 1760 idr_init(&sdata->u.nan.function_inst_ids); 1761 spin_lock_init(&sdata->u.nan.func_lock); 1762 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1763 break; 1764 case NL80211_IFTYPE_AP_VLAN: 1765 case NL80211_IFTYPE_P2P_DEVICE: 1766 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1767 break; 1768 case NL80211_IFTYPE_UNSPECIFIED: 1769 case NL80211_IFTYPE_WDS: 1770 case NUM_NL80211_IFTYPES: 1771 WARN_ON(1); 1772 break; 1773 } 1774 1775 /* need to do this after the switch so vif.type is correct */ 1776 ieee80211_link_setup(&sdata->deflink); 1777 1778 ieee80211_debugfs_add_netdev(sdata); 1779 } 1780 1781 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1782 enum nl80211_iftype type) 1783 { 1784 struct ieee80211_local *local = sdata->local; 1785 int ret, err; 1786 enum nl80211_iftype internal_type = type; 1787 bool p2p = false; 1788 1789 ASSERT_RTNL(); 1790 1791 if (!local->ops->change_interface) 1792 return -EBUSY; 1793 1794 /* for now, don't support changing while links exist */ 1795 if (ieee80211_vif_is_mld(&sdata->vif)) 1796 return -EBUSY; 1797 1798 switch (sdata->vif.type) { 1799 case NL80211_IFTYPE_AP: 1800 if (!list_empty(&sdata->u.ap.vlans)) 1801 return -EBUSY; 1802 break; 1803 case NL80211_IFTYPE_STATION: 1804 case NL80211_IFTYPE_ADHOC: 1805 case NL80211_IFTYPE_OCB: 1806 /* 1807 * Could maybe also all others here? 1808 * Just not sure how that interacts 1809 * with the RX/config path e.g. for 1810 * mesh. 1811 */ 1812 break; 1813 default: 1814 return -EBUSY; 1815 } 1816 1817 switch (type) { 1818 case NL80211_IFTYPE_AP: 1819 case NL80211_IFTYPE_STATION: 1820 case NL80211_IFTYPE_ADHOC: 1821 case NL80211_IFTYPE_OCB: 1822 /* 1823 * Could probably support everything 1824 * but here. 1825 */ 1826 break; 1827 case NL80211_IFTYPE_P2P_CLIENT: 1828 p2p = true; 1829 internal_type = NL80211_IFTYPE_STATION; 1830 break; 1831 case NL80211_IFTYPE_P2P_GO: 1832 p2p = true; 1833 internal_type = NL80211_IFTYPE_AP; 1834 break; 1835 default: 1836 return -EBUSY; 1837 } 1838 1839 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1840 if (ret) 1841 return ret; 1842 1843 ieee80211_stop_vif_queues(local, sdata, 1844 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1845 /* do_stop will synchronize_rcu() first thing */ 1846 ieee80211_do_stop(sdata, false); 1847 1848 ieee80211_teardown_sdata(sdata); 1849 1850 ieee80211_set_sdata_offload_flags(sdata); 1851 ret = drv_change_interface(local, sdata, internal_type, p2p); 1852 if (ret) 1853 type = ieee80211_vif_type_p2p(&sdata->vif); 1854 1855 /* 1856 * Ignore return value here, there's not much we can do since 1857 * the driver changed the interface type internally already. 1858 * The warnings will hopefully make driver authors fix it :-) 1859 */ 1860 ieee80211_check_queues(sdata, type); 1861 1862 ieee80211_setup_sdata(sdata, type); 1863 ieee80211_set_vif_encap_ops(sdata); 1864 1865 err = ieee80211_do_open(&sdata->wdev, false); 1866 WARN(err, "type change: do_open returned %d", err); 1867 1868 ieee80211_wake_vif_queues(local, sdata, 1869 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1870 return ret; 1871 } 1872 1873 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1874 enum nl80211_iftype type) 1875 { 1876 int ret; 1877 1878 ASSERT_RTNL(); 1879 1880 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1881 return 0; 1882 1883 if (ieee80211_sdata_running(sdata)) { 1884 ret = ieee80211_runtime_change_iftype(sdata, type); 1885 if (ret) 1886 return ret; 1887 } else { 1888 /* Purge and reset type-dependent state. */ 1889 ieee80211_teardown_sdata(sdata); 1890 ieee80211_setup_sdata(sdata, type); 1891 } 1892 1893 /* reset some values that shouldn't be kept across type changes */ 1894 if (type == NL80211_IFTYPE_STATION) 1895 sdata->u.mgd.use_4addr = false; 1896 1897 return 0; 1898 } 1899 1900 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1901 u8 *perm_addr, enum nl80211_iftype type) 1902 { 1903 struct ieee80211_sub_if_data *sdata; 1904 u64 mask, start, addr, val, inc; 1905 u8 *m; 1906 u8 tmp_addr[ETH_ALEN]; 1907 int i; 1908 1909 lockdep_assert_wiphy(local->hw.wiphy); 1910 1911 /* default ... something at least */ 1912 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1913 1914 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1915 local->hw.wiphy->n_addresses <= 1) 1916 return; 1917 1918 switch (type) { 1919 case NL80211_IFTYPE_MONITOR: 1920 /* doesn't matter */ 1921 break; 1922 case NL80211_IFTYPE_AP_VLAN: 1923 /* match up with an AP interface */ 1924 list_for_each_entry(sdata, &local->interfaces, list) { 1925 if (sdata->vif.type != NL80211_IFTYPE_AP) 1926 continue; 1927 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1928 break; 1929 } 1930 /* keep default if no AP interface present */ 1931 break; 1932 case NL80211_IFTYPE_P2P_CLIENT: 1933 case NL80211_IFTYPE_P2P_GO: 1934 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1935 list_for_each_entry(sdata, &local->interfaces, list) { 1936 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1937 continue; 1938 if (!ieee80211_sdata_running(sdata)) 1939 continue; 1940 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1941 return; 1942 } 1943 } 1944 fallthrough; 1945 default: 1946 /* assign a new address if possible -- try n_addresses first */ 1947 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1948 bool used = false; 1949 1950 list_for_each_entry(sdata, &local->interfaces, list) { 1951 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1952 sdata->vif.addr)) { 1953 used = true; 1954 break; 1955 } 1956 } 1957 1958 if (!used) { 1959 memcpy(perm_addr, 1960 local->hw.wiphy->addresses[i].addr, 1961 ETH_ALEN); 1962 break; 1963 } 1964 } 1965 1966 /* try mask if available */ 1967 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1968 break; 1969 1970 m = local->hw.wiphy->addr_mask; 1971 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1972 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1973 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1974 1975 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1976 /* not a contiguous mask ... not handled now! */ 1977 pr_info("not contiguous\n"); 1978 break; 1979 } 1980 1981 /* 1982 * Pick address of existing interface in case user changed 1983 * MAC address manually, default to perm_addr. 1984 */ 1985 m = local->hw.wiphy->perm_addr; 1986 list_for_each_entry(sdata, &local->interfaces, list) { 1987 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1988 continue; 1989 m = sdata->vif.addr; 1990 break; 1991 } 1992 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1993 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1994 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1995 1996 inc = 1ULL<<__ffs64(mask); 1997 val = (start & mask); 1998 addr = (start & ~mask) | (val & mask); 1999 do { 2000 bool used = false; 2001 2002 tmp_addr[5] = addr >> 0*8; 2003 tmp_addr[4] = addr >> 1*8; 2004 tmp_addr[3] = addr >> 2*8; 2005 tmp_addr[2] = addr >> 3*8; 2006 tmp_addr[1] = addr >> 4*8; 2007 tmp_addr[0] = addr >> 5*8; 2008 2009 val += inc; 2010 2011 list_for_each_entry(sdata, &local->interfaces, list) { 2012 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2013 used = true; 2014 break; 2015 } 2016 } 2017 2018 if (!used) { 2019 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2020 break; 2021 } 2022 addr = (start & ~mask) | (val & mask); 2023 } while (addr != start); 2024 2025 break; 2026 } 2027 } 2028 2029 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2030 unsigned char name_assign_type, 2031 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2032 struct vif_params *params) 2033 { 2034 struct net_device *ndev = NULL; 2035 struct ieee80211_sub_if_data *sdata = NULL; 2036 struct txq_info *txqi; 2037 int ret, i; 2038 2039 ASSERT_RTNL(); 2040 lockdep_assert_wiphy(local->hw.wiphy); 2041 2042 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2043 struct wireless_dev *wdev; 2044 2045 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2046 GFP_KERNEL); 2047 if (!sdata) 2048 return -ENOMEM; 2049 wdev = &sdata->wdev; 2050 2051 sdata->dev = NULL; 2052 strscpy(sdata->name, name, IFNAMSIZ); 2053 ieee80211_assign_perm_addr(local, wdev->address, type); 2054 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2055 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2056 } else { 2057 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2058 sizeof(void *)); 2059 int txq_size = 0; 2060 2061 if (type != NL80211_IFTYPE_AP_VLAN && 2062 (type != NL80211_IFTYPE_MONITOR || 2063 (params->flags & MONITOR_FLAG_ACTIVE))) 2064 txq_size += sizeof(struct txq_info) + 2065 local->hw.txq_data_size; 2066 2067 ndev = alloc_netdev_mqs(size + txq_size, 2068 name, name_assign_type, 2069 ieee80211_if_setup, 1, 1); 2070 if (!ndev) 2071 return -ENOMEM; 2072 2073 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2074 2075 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2076 if (!ndev->tstats) { 2077 free_netdev(ndev); 2078 return -ENOMEM; 2079 } 2080 2081 ndev->needed_headroom = local->tx_headroom + 2082 4*6 /* four MAC addresses */ 2083 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2084 + 6 /* mesh */ 2085 + 8 /* rfc1042/bridge tunnel */ 2086 - ETH_HLEN /* ethernet hard_header_len */ 2087 + IEEE80211_ENCRYPT_HEADROOM; 2088 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2089 2090 ret = dev_alloc_name(ndev, ndev->name); 2091 if (ret < 0) { 2092 ieee80211_if_free(ndev); 2093 free_netdev(ndev); 2094 return ret; 2095 } 2096 2097 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2098 if (is_valid_ether_addr(params->macaddr)) 2099 eth_hw_addr_set(ndev, params->macaddr); 2100 else 2101 eth_hw_addr_set(ndev, ndev->perm_addr); 2102 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2103 2104 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2105 sdata = netdev_priv(ndev); 2106 ndev->ieee80211_ptr = &sdata->wdev; 2107 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2108 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2109 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2110 2111 if (txq_size) { 2112 txqi = netdev_priv(ndev) + size; 2113 ieee80211_txq_init(sdata, NULL, txqi, 0); 2114 } 2115 2116 sdata->dev = ndev; 2117 } 2118 2119 /* initialise type-independent data */ 2120 sdata->wdev.wiphy = local->hw.wiphy; 2121 2122 ieee80211_sdata_init(local, sdata); 2123 2124 ieee80211_init_frag_cache(&sdata->frags); 2125 2126 INIT_LIST_HEAD(&sdata->key_list); 2127 2128 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2129 ieee80211_delayed_tailroom_dec); 2130 2131 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2132 struct ieee80211_supported_band *sband; 2133 sband = local->hw.wiphy->bands[i]; 2134 sdata->rc_rateidx_mask[i] = 2135 sband ? (1 << sband->n_bitrates) - 1 : 0; 2136 if (sband) { 2137 __le16 cap; 2138 u16 *vht_rate_mask; 2139 2140 memcpy(sdata->rc_rateidx_mcs_mask[i], 2141 sband->ht_cap.mcs.rx_mask, 2142 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2143 2144 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2145 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2146 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2147 } else { 2148 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2149 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2150 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2151 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2152 } 2153 } 2154 2155 ieee80211_set_default_queues(sdata); 2156 2157 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2158 sdata->deflink.user_power_level = local->user_power_level; 2159 2160 /* setup type-dependent data */ 2161 ieee80211_setup_sdata(sdata, type); 2162 2163 if (ndev) { 2164 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2165 if (type == NL80211_IFTYPE_STATION) 2166 sdata->u.mgd.use_4addr = params->use_4addr; 2167 2168 ndev->features |= local->hw.netdev_features; 2169 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2170 ndev->hw_features |= ndev->features & 2171 MAC80211_SUPPORTED_FEATURES_TX; 2172 sdata->vif.netdev_features = local->hw.netdev_features; 2173 2174 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2175 2176 /* MTU range is normally 256 - 2304, where the upper limit is 2177 * the maximum MSDU size. Monitor interfaces send and receive 2178 * MPDU and A-MSDU frames which may be much larger so we do 2179 * not impose an upper limit in that case. 2180 */ 2181 ndev->min_mtu = 256; 2182 if (type == NL80211_IFTYPE_MONITOR) 2183 ndev->max_mtu = 0; 2184 else 2185 ndev->max_mtu = local->hw.max_mtu; 2186 2187 ret = cfg80211_register_netdevice(ndev); 2188 if (ret) { 2189 free_netdev(ndev); 2190 return ret; 2191 } 2192 } 2193 2194 mutex_lock(&local->iflist_mtx); 2195 list_add_tail_rcu(&sdata->list, &local->interfaces); 2196 mutex_unlock(&local->iflist_mtx); 2197 2198 if (new_wdev) 2199 *new_wdev = &sdata->wdev; 2200 2201 return 0; 2202 } 2203 2204 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2205 { 2206 ASSERT_RTNL(); 2207 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2208 2209 mutex_lock(&sdata->local->iflist_mtx); 2210 list_del_rcu(&sdata->list); 2211 mutex_unlock(&sdata->local->iflist_mtx); 2212 2213 if (sdata->vif.txq) 2214 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2215 2216 synchronize_rcu(); 2217 2218 cfg80211_unregister_wdev(&sdata->wdev); 2219 2220 if (!sdata->dev) { 2221 ieee80211_teardown_sdata(sdata); 2222 kfree(sdata); 2223 } 2224 } 2225 2226 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2227 { 2228 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2229 return; 2230 ieee80211_do_stop(sdata, true); 2231 } 2232 2233 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2234 { 2235 struct ieee80211_sub_if_data *sdata, *tmp; 2236 LIST_HEAD(unreg_list); 2237 2238 ASSERT_RTNL(); 2239 2240 /* Before destroying the interfaces, make sure they're all stopped so 2241 * that the hardware is stopped. Otherwise, the driver might still be 2242 * iterating the interfaces during the shutdown, e.g. from a worker 2243 * or from RX processing or similar, and if it does so (using atomic 2244 * iteration) while we're manipulating the list, the iteration will 2245 * crash. 2246 * 2247 * After this, the hardware should be stopped and the driver should 2248 * have stopped all of its activities, so that we can do RCU-unaware 2249 * manipulations of the interface list below. 2250 */ 2251 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2252 2253 wiphy_lock(local->hw.wiphy); 2254 2255 WARN(local->open_count, "%s: open count remains %d\n", 2256 wiphy_name(local->hw.wiphy), local->open_count); 2257 2258 mutex_lock(&local->iflist_mtx); 2259 list_splice_init(&local->interfaces, &unreg_list); 2260 mutex_unlock(&local->iflist_mtx); 2261 2262 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2263 bool netdev = sdata->dev; 2264 2265 /* 2266 * Remove IP addresses explicitly, since the notifier will 2267 * skip the callbacks if wdev->registered is false, since 2268 * we can't acquire the wiphy_lock() again there if already 2269 * inside this locked section. 2270 */ 2271 sdata->vif.cfg.arp_addr_cnt = 0; 2272 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2273 sdata->u.mgd.associated) 2274 ieee80211_vif_cfg_change_notify(sdata, 2275 BSS_CHANGED_ARP_FILTER); 2276 2277 list_del(&sdata->list); 2278 cfg80211_unregister_wdev(&sdata->wdev); 2279 2280 if (!netdev) 2281 kfree(sdata); 2282 } 2283 wiphy_unlock(local->hw.wiphy); 2284 } 2285 2286 static int netdev_notify(struct notifier_block *nb, 2287 unsigned long state, void *ptr) 2288 { 2289 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2290 struct ieee80211_sub_if_data *sdata; 2291 2292 if (state != NETDEV_CHANGENAME) 2293 return NOTIFY_DONE; 2294 2295 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2296 return NOTIFY_DONE; 2297 2298 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2299 return NOTIFY_DONE; 2300 2301 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2302 memcpy(sdata->name, dev->name, IFNAMSIZ); 2303 ieee80211_debugfs_rename_netdev(sdata); 2304 2305 return NOTIFY_OK; 2306 } 2307 2308 static struct notifier_block mac80211_netdev_notifier = { 2309 .notifier_call = netdev_notify, 2310 }; 2311 2312 int ieee80211_iface_init(void) 2313 { 2314 return register_netdevice_notifier(&mac80211_netdev_notifier); 2315 } 2316 2317 void ieee80211_iface_exit(void) 2318 { 2319 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2320 } 2321 2322 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2323 { 2324 if (sdata->vif.type == NL80211_IFTYPE_AP) 2325 atomic_inc(&sdata->u.ap.num_mcast_sta); 2326 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2327 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2328 } 2329 2330 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2331 { 2332 if (sdata->vif.type == NL80211_IFTYPE_AP) 2333 atomic_dec(&sdata->u.ap.num_mcast_sta); 2334 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2335 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2336 } 2337