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) 2018-2021 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 37 * (2) modifications and readers are protected against each other by 38 * the iflist_mtx. 39 * (3) modifications are done in an RCU manner so atomic readers 40 * can traverse the list in RCU-safe blocks. 41 * 42 * As a consequence, reads (traversals) of the list can be protected 43 * by either the RTNL, the iflist_mtx or RCU. 44 */ 45 46 static void ieee80211_iface_work(struct work_struct *work); 47 48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 49 { 50 struct ieee80211_chanctx_conf *chanctx_conf; 51 int power; 52 53 rcu_read_lock(); 54 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 55 if (!chanctx_conf) { 56 rcu_read_unlock(); 57 return false; 58 } 59 60 power = ieee80211_chandef_max_power(&chanctx_conf->def); 61 rcu_read_unlock(); 62 63 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 64 power = min(power, sdata->user_power_level); 65 66 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 67 power = min(power, sdata->ap_power_level); 68 69 if (power != sdata->vif.bss_conf.txpower) { 70 sdata->vif.bss_conf.txpower = power; 71 ieee80211_hw_config(sdata->local, 0); 72 return true; 73 } 74 75 return false; 76 } 77 78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 79 bool update_bss) 80 { 81 if (__ieee80211_recalc_txpower(sdata) || 82 (update_bss && ieee80211_sdata_running(sdata))) 83 ieee80211_bss_info_change_notify(sdata, 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_held(&local->mtx); 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 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 163 return 0; 164 165 m = addr; 166 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 167 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 168 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 169 170 m = local->hw.wiphy->addr_mask; 171 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 174 175 if (!check_dup) 176 return ret; 177 178 mutex_lock(&local->iflist_mtx); 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 mutex_unlock(&local->iflist_mtx); 198 199 return ret; 200 } 201 202 static int ieee80211_change_mac(struct net_device *dev, void *addr) 203 { 204 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 205 struct sockaddr *sa = addr; 206 bool check_dup = true; 207 int ret; 208 209 if (ieee80211_sdata_running(sdata)) 210 return -EBUSY; 211 212 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 213 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 214 check_dup = false; 215 216 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 217 if (ret) 218 return ret; 219 220 ret = eth_mac_addr(dev, sa); 221 222 if (ret == 0) 223 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 224 225 return ret; 226 } 227 228 static inline int identical_mac_addr_allowed(int type1, int type2) 229 { 230 return type1 == NL80211_IFTYPE_MONITOR || 231 type2 == NL80211_IFTYPE_MONITOR || 232 type1 == NL80211_IFTYPE_P2P_DEVICE || 233 type2 == NL80211_IFTYPE_P2P_DEVICE || 234 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 235 (type1 == NL80211_IFTYPE_AP_VLAN && 236 (type2 == NL80211_IFTYPE_AP || 237 type2 == NL80211_IFTYPE_AP_VLAN)); 238 } 239 240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 241 enum nl80211_iftype iftype) 242 { 243 struct ieee80211_local *local = sdata->local; 244 struct ieee80211_sub_if_data *nsdata; 245 int ret; 246 247 ASSERT_RTNL(); 248 249 /* we hold the RTNL here so can safely walk the list */ 250 list_for_each_entry(nsdata, &local->interfaces, list) { 251 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 252 /* 253 * Only OCB and monitor mode may coexist 254 */ 255 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 256 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 257 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 258 nsdata->vif.type == NL80211_IFTYPE_OCB)) 259 return -EBUSY; 260 261 /* 262 * Allow only a single IBSS interface to be up at any 263 * time. This is restricted because beacon distribution 264 * cannot work properly if both are in the same IBSS. 265 * 266 * To remove this restriction we'd have to disallow them 267 * from setting the same SSID on different IBSS interfaces 268 * belonging to the same hardware. Then, however, we're 269 * faced with having to adopt two different TSF timers... 270 */ 271 if (iftype == NL80211_IFTYPE_ADHOC && 272 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 273 return -EBUSY; 274 /* 275 * will not add another interface while any channel 276 * switch is active. 277 */ 278 if (nsdata->vif.csa_active) 279 return -EBUSY; 280 281 /* 282 * The remaining checks are only performed for interfaces 283 * with the same MAC address. 284 */ 285 if (!ether_addr_equal(sdata->vif.addr, 286 nsdata->vif.addr)) 287 continue; 288 289 /* 290 * check whether it may have the same address 291 */ 292 if (!identical_mac_addr_allowed(iftype, 293 nsdata->vif.type)) 294 return -ENOTUNIQ; 295 296 /* 297 * can only add VLANs to enabled APs 298 */ 299 if (iftype == NL80211_IFTYPE_AP_VLAN && 300 nsdata->vif.type == NL80211_IFTYPE_AP) 301 sdata->bss = &nsdata->u.ap; 302 } 303 } 304 305 mutex_lock(&local->chanctx_mtx); 306 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 307 mutex_unlock(&local->chanctx_mtx); 308 return ret; 309 } 310 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 312 enum nl80211_iftype iftype) 313 { 314 int n_queues = sdata->local->hw.queues; 315 int i; 316 317 if (iftype == NL80211_IFTYPE_NAN) 318 return 0; 319 320 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 321 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 323 IEEE80211_INVAL_HW_QUEUE)) 324 return -EINVAL; 325 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 326 n_queues)) 327 return -EINVAL; 328 } 329 } 330 331 if ((iftype != NL80211_IFTYPE_AP && 332 iftype != NL80211_IFTYPE_P2P_GO && 333 iftype != NL80211_IFTYPE_MESH_POINT) || 334 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 335 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 336 return 0; 337 } 338 339 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 340 return -EINVAL; 341 342 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 343 return -EINVAL; 344 345 return 0; 346 } 347 348 static int ieee80211_open(struct net_device *dev) 349 { 350 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 351 int err; 352 353 /* fail early if user set an invalid address */ 354 if (!is_valid_ether_addr(dev->dev_addr)) 355 return -EADDRNOTAVAIL; 356 357 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 358 if (err) 359 return err; 360 361 wiphy_lock(sdata->local->hw.wiphy); 362 err = ieee80211_do_open(&sdata->wdev, true); 363 wiphy_unlock(sdata->local->hw.wiphy); 364 365 return err; 366 } 367 368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 369 { 370 struct ieee80211_local *local = sdata->local; 371 unsigned long flags; 372 struct sk_buff *skb, *tmp; 373 u32 hw_reconf_flags = 0; 374 int i, flushed; 375 struct ps_data *ps; 376 struct cfg80211_chan_def chandef; 377 bool cancel_scan; 378 struct cfg80211_nan_func *func; 379 380 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 381 382 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 383 if (cancel_scan) 384 ieee80211_scan_cancel(local); 385 386 /* 387 * Stop TX on this interface first. 388 */ 389 if (sdata->dev) 390 netif_tx_stop_all_queues(sdata->dev); 391 392 ieee80211_roc_purge(local, sdata); 393 394 switch (sdata->vif.type) { 395 case NL80211_IFTYPE_STATION: 396 ieee80211_mgd_stop(sdata); 397 break; 398 case NL80211_IFTYPE_ADHOC: 399 ieee80211_ibss_stop(sdata); 400 break; 401 case NL80211_IFTYPE_MONITOR: 402 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 403 break; 404 list_del_rcu(&sdata->u.mntr.list); 405 break; 406 default: 407 break; 408 } 409 410 /* 411 * Remove all stations associated with this interface. 412 * 413 * This must be done before calling ops->remove_interface() 414 * because otherwise we can later invoke ops->sta_notify() 415 * whenever the STAs are removed, and that invalidates driver 416 * assumptions about always getting a vif pointer that is valid 417 * (because if we remove a STA after ops->remove_interface() 418 * the driver will have removed the vif info already!) 419 * 420 * For AP_VLANs stations may exist since there's nothing else that 421 * would have removed them, but in other modes there shouldn't 422 * be any stations. 423 */ 424 flushed = sta_info_flush(sdata); 425 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 426 427 /* don't count this interface for allmulti while it is down */ 428 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 429 atomic_dec(&local->iff_allmultis); 430 431 if (sdata->vif.type == NL80211_IFTYPE_AP) { 432 local->fif_pspoll--; 433 local->fif_probe_req--; 434 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 435 local->fif_probe_req--; 436 } 437 438 if (sdata->dev) { 439 netif_addr_lock_bh(sdata->dev); 440 spin_lock_bh(&local->filter_lock); 441 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 442 sdata->dev->addr_len); 443 spin_unlock_bh(&local->filter_lock); 444 netif_addr_unlock_bh(sdata->dev); 445 } 446 447 del_timer_sync(&local->dynamic_ps_timer); 448 cancel_work_sync(&local->dynamic_ps_enable_work); 449 450 cancel_work_sync(&sdata->recalc_smps); 451 sdata_lock(sdata); 452 mutex_lock(&local->mtx); 453 sdata->vif.csa_active = false; 454 if (sdata->vif.type == NL80211_IFTYPE_STATION) 455 sdata->u.mgd.csa_waiting_bcn = false; 456 if (sdata->csa_block_tx) { 457 ieee80211_wake_vif_queues(local, sdata, 458 IEEE80211_QUEUE_STOP_REASON_CSA); 459 sdata->csa_block_tx = false; 460 } 461 mutex_unlock(&local->mtx); 462 sdata_unlock(sdata); 463 464 cancel_work_sync(&sdata->csa_finalize_work); 465 cancel_work_sync(&sdata->color_change_finalize_work); 466 467 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 468 469 if (sdata->wdev.cac_started) { 470 chandef = sdata->vif.bss_conf.chandef; 471 WARN_ON(local->suspended); 472 mutex_lock(&local->mtx); 473 ieee80211_vif_release_channel(sdata); 474 mutex_unlock(&local->mtx); 475 cfg80211_cac_event(sdata->dev, &chandef, 476 NL80211_RADAR_CAC_ABORTED, 477 GFP_KERNEL); 478 } 479 480 if (sdata->vif.type == NL80211_IFTYPE_AP) { 481 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 482 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 483 /* remove all packets in parent bc_buf pointing to this dev */ 484 ps = &sdata->bss->ps; 485 486 spin_lock_irqsave(&ps->bc_buf.lock, flags); 487 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 488 if (skb->dev == sdata->dev) { 489 __skb_unlink(skb, &ps->bc_buf); 490 local->total_ps_buffered--; 491 ieee80211_free_txskb(&local->hw, skb); 492 } 493 } 494 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 495 } 496 497 if (going_down) 498 local->open_count--; 499 500 switch (sdata->vif.type) { 501 case NL80211_IFTYPE_AP_VLAN: 502 mutex_lock(&local->mtx); 503 list_del(&sdata->u.vlan.list); 504 mutex_unlock(&local->mtx); 505 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 506 /* see comment in the default case below */ 507 ieee80211_free_keys(sdata, true); 508 /* no need to tell driver */ 509 break; 510 case NL80211_IFTYPE_MONITOR: 511 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 512 local->cooked_mntrs--; 513 break; 514 } 515 516 local->monitors--; 517 if (local->monitors == 0) { 518 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 519 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 520 } 521 522 ieee80211_adjust_monitor_flags(sdata, -1); 523 break; 524 case NL80211_IFTYPE_NAN: 525 /* clean all the functions */ 526 spin_lock_bh(&sdata->u.nan.func_lock); 527 528 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 529 idr_remove(&sdata->u.nan.function_inst_ids, i); 530 cfg80211_free_nan_func(func); 531 } 532 idr_destroy(&sdata->u.nan.function_inst_ids); 533 534 spin_unlock_bh(&sdata->u.nan.func_lock); 535 break; 536 case NL80211_IFTYPE_P2P_DEVICE: 537 /* relies on synchronize_rcu() below */ 538 RCU_INIT_POINTER(local->p2p_sdata, NULL); 539 fallthrough; 540 default: 541 cancel_work_sync(&sdata->work); 542 /* 543 * When we get here, the interface is marked down. 544 * Free the remaining keys, if there are any 545 * (which can happen in AP mode if userspace sets 546 * keys before the interface is operating) 547 * 548 * Force the key freeing to always synchronize_net() 549 * to wait for the RX path in case it is using this 550 * interface enqueuing frames at this very time on 551 * another CPU. 552 */ 553 ieee80211_free_keys(sdata, true); 554 skb_queue_purge(&sdata->skb_queue); 555 } 556 557 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 558 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 559 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 560 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 561 if (info->control.vif == &sdata->vif) { 562 __skb_unlink(skb, &local->pending[i]); 563 ieee80211_free_txskb(&local->hw, skb); 564 } 565 } 566 } 567 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 568 569 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 570 ieee80211_txq_remove_vlan(local, sdata); 571 572 sdata->bss = NULL; 573 574 if (local->open_count == 0) 575 ieee80211_clear_tx_pending(local); 576 577 sdata->vif.bss_conf.beacon_int = 0; 578 579 /* 580 * If the interface goes down while suspended, presumably because 581 * the device was unplugged and that happens before our resume, 582 * then the driver is already unconfigured and the remainder of 583 * this function isn't needed. 584 * XXX: what about WoWLAN? If the device has software state, e.g. 585 * memory allocated, it might expect teardown commands from 586 * mac80211 here? 587 */ 588 if (local->suspended) { 589 WARN_ON(local->wowlan); 590 WARN_ON(rtnl_dereference(local->monitor_sdata)); 591 return; 592 } 593 594 switch (sdata->vif.type) { 595 case NL80211_IFTYPE_AP_VLAN: 596 break; 597 case NL80211_IFTYPE_MONITOR: 598 if (local->monitors == 0) 599 ieee80211_del_virtual_monitor(local); 600 601 mutex_lock(&local->mtx); 602 ieee80211_recalc_idle(local); 603 mutex_unlock(&local->mtx); 604 605 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 606 break; 607 608 fallthrough; 609 default: 610 if (going_down) 611 drv_remove_interface(local, sdata); 612 } 613 614 ieee80211_recalc_ps(local); 615 616 if (cancel_scan) 617 flush_delayed_work(&local->scan_work); 618 619 if (local->open_count == 0) { 620 ieee80211_stop_device(local); 621 622 /* no reconfiguring after stop! */ 623 return; 624 } 625 626 /* do after stop to avoid reconfiguring when we stop anyway */ 627 ieee80211_configure_filter(local); 628 ieee80211_hw_config(local, hw_reconf_flags); 629 630 if (local->monitors == local->open_count) 631 ieee80211_add_virtual_monitor(local); 632 } 633 634 static int ieee80211_stop(struct net_device *dev) 635 { 636 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 637 638 /* close all dependent VLAN interfaces before locking wiphy */ 639 if (sdata->vif.type == NL80211_IFTYPE_AP) { 640 struct ieee80211_sub_if_data *vlan, *tmpsdata; 641 642 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 643 u.vlan.list) 644 dev_close(vlan->dev); 645 } 646 647 wiphy_lock(sdata->local->hw.wiphy); 648 ieee80211_do_stop(sdata, true); 649 wiphy_unlock(sdata->local->hw.wiphy); 650 651 return 0; 652 } 653 654 static void ieee80211_set_multicast_list(struct net_device *dev) 655 { 656 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 657 struct ieee80211_local *local = sdata->local; 658 int allmulti, sdata_allmulti; 659 660 allmulti = !!(dev->flags & IFF_ALLMULTI); 661 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 662 663 if (allmulti != sdata_allmulti) { 664 if (dev->flags & IFF_ALLMULTI) 665 atomic_inc(&local->iff_allmultis); 666 else 667 atomic_dec(&local->iff_allmultis); 668 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 669 } 670 671 spin_lock_bh(&local->filter_lock); 672 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 673 spin_unlock_bh(&local->filter_lock); 674 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 675 } 676 677 /* 678 * Called when the netdev is removed or, by the code below, before 679 * the interface type changes. 680 */ 681 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 682 { 683 /* free extra data */ 684 ieee80211_free_keys(sdata, false); 685 686 ieee80211_debugfs_remove_netdev(sdata); 687 688 ieee80211_destroy_frag_cache(&sdata->frags); 689 690 if (ieee80211_vif_is_mesh(&sdata->vif)) 691 ieee80211_mesh_teardown_sdata(sdata); 692 } 693 694 static void ieee80211_uninit(struct net_device *dev) 695 { 696 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 697 } 698 699 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 700 struct sk_buff *skb, 701 struct net_device *sb_dev) 702 { 703 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 704 } 705 706 static void 707 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 708 { 709 dev_fetch_sw_netstats(stats, dev->tstats); 710 } 711 712 static const struct net_device_ops ieee80211_dataif_ops = { 713 .ndo_open = ieee80211_open, 714 .ndo_stop = ieee80211_stop, 715 .ndo_uninit = ieee80211_uninit, 716 .ndo_start_xmit = ieee80211_subif_start_xmit, 717 .ndo_set_rx_mode = ieee80211_set_multicast_list, 718 .ndo_set_mac_address = ieee80211_change_mac, 719 .ndo_select_queue = ieee80211_netdev_select_queue, 720 .ndo_get_stats64 = ieee80211_get_stats64, 721 }; 722 723 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 724 struct sk_buff *skb, 725 struct net_device *sb_dev) 726 { 727 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 728 struct ieee80211_local *local = sdata->local; 729 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 730 struct ieee80211_hdr *hdr; 731 int len_rthdr; 732 733 if (local->hw.queues < IEEE80211_NUM_ACS) 734 return 0; 735 736 /* reset flags and info before parsing radiotap header */ 737 memset(info, 0, sizeof(*info)); 738 739 if (!ieee80211_parse_tx_radiotap(skb, dev)) 740 return 0; /* doesn't matter, frame will be dropped */ 741 742 len_rthdr = ieee80211_get_radiotap_len(skb->data); 743 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 744 if (skb->len < len_rthdr + 2 || 745 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 746 return 0; /* doesn't matter, frame will be dropped */ 747 748 return ieee80211_select_queue_80211(sdata, skb, hdr); 749 } 750 751 static const struct net_device_ops ieee80211_monitorif_ops = { 752 .ndo_open = ieee80211_open, 753 .ndo_stop = ieee80211_stop, 754 .ndo_uninit = ieee80211_uninit, 755 .ndo_start_xmit = ieee80211_monitor_start_xmit, 756 .ndo_set_rx_mode = ieee80211_set_multicast_list, 757 .ndo_set_mac_address = ieee80211_change_mac, 758 .ndo_select_queue = ieee80211_monitor_select_queue, 759 .ndo_get_stats64 = ieee80211_get_stats64, 760 }; 761 762 static const struct net_device_ops ieee80211_dataif_8023_ops = { 763 .ndo_open = ieee80211_open, 764 .ndo_stop = ieee80211_stop, 765 .ndo_uninit = ieee80211_uninit, 766 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 767 .ndo_set_rx_mode = ieee80211_set_multicast_list, 768 .ndo_set_mac_address = ieee80211_change_mac, 769 .ndo_select_queue = ieee80211_netdev_select_queue, 770 .ndo_get_stats64 = ieee80211_get_stats64, 771 }; 772 773 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 774 { 775 switch (iftype) { 776 /* P2P GO and client are mapped to AP/STATION types */ 777 case NL80211_IFTYPE_AP: 778 case NL80211_IFTYPE_STATION: 779 return true; 780 default: 781 return false; 782 } 783 } 784 785 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 786 { 787 struct ieee80211_local *local = sdata->local; 788 u32 flags; 789 790 flags = sdata->vif.offload_flags; 791 792 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 793 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 794 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 795 796 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 797 local->hw.wiphy->frag_threshold != (u32)-1) 798 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 799 800 if (local->monitors) 801 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 802 } else { 803 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 804 } 805 806 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 807 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 808 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 809 810 if (local->monitors && 811 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 812 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 813 } else { 814 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 815 } 816 817 if (sdata->vif.offload_flags == flags) 818 return false; 819 820 sdata->vif.offload_flags = flags; 821 ieee80211_check_fast_rx_iface(sdata); 822 return true; 823 } 824 825 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 826 { 827 struct ieee80211_local *local = sdata->local; 828 struct ieee80211_sub_if_data *bss = sdata; 829 bool enabled; 830 831 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 832 if (!sdata->bss) 833 return; 834 835 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 836 } 837 838 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 839 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 840 return; 841 842 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 843 if (sdata->wdev.use_4addr && 844 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 845 enabled = false; 846 847 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 848 &ieee80211_dataif_ops; 849 } 850 851 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 852 { 853 struct ieee80211_local *local = sdata->local; 854 struct ieee80211_sub_if_data *vsdata; 855 856 if (ieee80211_set_sdata_offload_flags(sdata)) { 857 drv_update_vif_offload(local, sdata); 858 ieee80211_set_vif_encap_ops(sdata); 859 } 860 861 list_for_each_entry(vsdata, &local->interfaces, list) { 862 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 863 vsdata->bss != &sdata->u.ap) 864 continue; 865 866 ieee80211_set_vif_encap_ops(vsdata); 867 } 868 } 869 870 void ieee80211_recalc_offload(struct ieee80211_local *local) 871 { 872 struct ieee80211_sub_if_data *sdata; 873 874 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 875 return; 876 877 mutex_lock(&local->iflist_mtx); 878 879 list_for_each_entry(sdata, &local->interfaces, list) { 880 if (!ieee80211_sdata_running(sdata)) 881 continue; 882 883 ieee80211_recalc_sdata_offload(sdata); 884 } 885 886 mutex_unlock(&local->iflist_mtx); 887 } 888 889 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 890 const int offset) 891 { 892 struct ieee80211_local *local = sdata->local; 893 u32 flags = sdata->u.mntr.flags; 894 895 #define ADJUST(_f, _s) do { \ 896 if (flags & MONITOR_FLAG_##_f) \ 897 local->fif_##_s += offset; \ 898 } while (0) 899 900 ADJUST(FCSFAIL, fcsfail); 901 ADJUST(PLCPFAIL, plcpfail); 902 ADJUST(CONTROL, control); 903 ADJUST(CONTROL, pspoll); 904 ADJUST(OTHER_BSS, other_bss); 905 906 #undef ADJUST 907 } 908 909 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 910 { 911 struct ieee80211_local *local = sdata->local; 912 int i; 913 914 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 915 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 916 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 917 else if (local->hw.queues >= IEEE80211_NUM_ACS) 918 sdata->vif.hw_queue[i] = i; 919 else 920 sdata->vif.hw_queue[i] = 0; 921 } 922 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 923 } 924 925 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 926 { 927 struct ieee80211_sub_if_data *sdata; 928 int ret; 929 930 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 931 return 0; 932 933 ASSERT_RTNL(); 934 935 if (local->monitor_sdata) 936 return 0; 937 938 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 939 if (!sdata) 940 return -ENOMEM; 941 942 /* set up data */ 943 sdata->local = local; 944 sdata->vif.type = NL80211_IFTYPE_MONITOR; 945 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 946 wiphy_name(local->hw.wiphy)); 947 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 948 949 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 950 951 ieee80211_set_default_queues(sdata); 952 953 ret = drv_add_interface(local, sdata); 954 if (WARN_ON(ret)) { 955 /* ok .. stupid driver, it asked for this! */ 956 kfree(sdata); 957 return ret; 958 } 959 960 set_bit(SDATA_STATE_RUNNING, &sdata->state); 961 962 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 963 if (ret) { 964 kfree(sdata); 965 return ret; 966 } 967 968 mutex_lock(&local->iflist_mtx); 969 rcu_assign_pointer(local->monitor_sdata, sdata); 970 mutex_unlock(&local->iflist_mtx); 971 972 mutex_lock(&local->mtx); 973 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 974 IEEE80211_CHANCTX_EXCLUSIVE); 975 mutex_unlock(&local->mtx); 976 if (ret) { 977 mutex_lock(&local->iflist_mtx); 978 RCU_INIT_POINTER(local->monitor_sdata, NULL); 979 mutex_unlock(&local->iflist_mtx); 980 synchronize_net(); 981 drv_remove_interface(local, sdata); 982 kfree(sdata); 983 return ret; 984 } 985 986 skb_queue_head_init(&sdata->skb_queue); 987 INIT_WORK(&sdata->work, ieee80211_iface_work); 988 989 return 0; 990 } 991 992 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 993 { 994 struct ieee80211_sub_if_data *sdata; 995 996 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 997 return; 998 999 ASSERT_RTNL(); 1000 1001 mutex_lock(&local->iflist_mtx); 1002 1003 sdata = rcu_dereference_protected(local->monitor_sdata, 1004 lockdep_is_held(&local->iflist_mtx)); 1005 if (!sdata) { 1006 mutex_unlock(&local->iflist_mtx); 1007 return; 1008 } 1009 1010 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1011 mutex_unlock(&local->iflist_mtx); 1012 1013 synchronize_net(); 1014 1015 mutex_lock(&local->mtx); 1016 ieee80211_vif_release_channel(sdata); 1017 mutex_unlock(&local->mtx); 1018 1019 drv_remove_interface(local, sdata); 1020 1021 kfree(sdata); 1022 } 1023 1024 /* 1025 * NOTE: Be very careful when changing this function, it must NOT return 1026 * an error on interface type changes that have been pre-checked, so most 1027 * checks should be in ieee80211_check_concurrent_iface. 1028 */ 1029 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1030 { 1031 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1032 struct net_device *dev = wdev->netdev; 1033 struct ieee80211_local *local = sdata->local; 1034 u32 changed = 0; 1035 int res; 1036 u32 hw_reconf_flags = 0; 1037 1038 switch (sdata->vif.type) { 1039 case NL80211_IFTYPE_AP_VLAN: { 1040 struct ieee80211_sub_if_data *master; 1041 1042 if (!sdata->bss) 1043 return -ENOLINK; 1044 1045 mutex_lock(&local->mtx); 1046 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1047 mutex_unlock(&local->mtx); 1048 1049 master = container_of(sdata->bss, 1050 struct ieee80211_sub_if_data, u.ap); 1051 sdata->control_port_protocol = 1052 master->control_port_protocol; 1053 sdata->control_port_no_encrypt = 1054 master->control_port_no_encrypt; 1055 sdata->control_port_over_nl80211 = 1056 master->control_port_over_nl80211; 1057 sdata->control_port_no_preauth = 1058 master->control_port_no_preauth; 1059 sdata->vif.cab_queue = master->vif.cab_queue; 1060 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1061 sizeof(sdata->vif.hw_queue)); 1062 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 1063 1064 mutex_lock(&local->key_mtx); 1065 sdata->crypto_tx_tailroom_needed_cnt += 1066 master->crypto_tx_tailroom_needed_cnt; 1067 mutex_unlock(&local->key_mtx); 1068 1069 break; 1070 } 1071 case NL80211_IFTYPE_AP: 1072 sdata->bss = &sdata->u.ap; 1073 break; 1074 case NL80211_IFTYPE_MESH_POINT: 1075 case NL80211_IFTYPE_STATION: 1076 case NL80211_IFTYPE_MONITOR: 1077 case NL80211_IFTYPE_ADHOC: 1078 case NL80211_IFTYPE_P2P_DEVICE: 1079 case NL80211_IFTYPE_OCB: 1080 case NL80211_IFTYPE_NAN: 1081 /* no special treatment */ 1082 break; 1083 case NL80211_IFTYPE_UNSPECIFIED: 1084 case NUM_NL80211_IFTYPES: 1085 case NL80211_IFTYPE_P2P_CLIENT: 1086 case NL80211_IFTYPE_P2P_GO: 1087 case NL80211_IFTYPE_WDS: 1088 /* cannot happen */ 1089 WARN_ON(1); 1090 break; 1091 } 1092 1093 if (local->open_count == 0) { 1094 res = drv_start(local); 1095 if (res) 1096 goto err_del_bss; 1097 /* we're brought up, everything changes */ 1098 hw_reconf_flags = ~0; 1099 ieee80211_led_radio(local, true); 1100 ieee80211_mod_tpt_led_trig(local, 1101 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1102 } 1103 1104 /* 1105 * Copy the hopefully now-present MAC address to 1106 * this interface, if it has the special null one. 1107 */ 1108 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1109 memcpy(dev->dev_addr, 1110 local->hw.wiphy->perm_addr, 1111 ETH_ALEN); 1112 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1113 1114 if (!is_valid_ether_addr(dev->dev_addr)) { 1115 res = -EADDRNOTAVAIL; 1116 goto err_stop; 1117 } 1118 } 1119 1120 switch (sdata->vif.type) { 1121 case NL80211_IFTYPE_AP_VLAN: 1122 /* no need to tell driver, but set carrier and chanctx */ 1123 if (rtnl_dereference(sdata->bss->beacon)) { 1124 ieee80211_vif_vlan_copy_chanctx(sdata); 1125 netif_carrier_on(dev); 1126 ieee80211_set_vif_encap_ops(sdata); 1127 } else { 1128 netif_carrier_off(dev); 1129 } 1130 break; 1131 case NL80211_IFTYPE_MONITOR: 1132 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1133 local->cooked_mntrs++; 1134 break; 1135 } 1136 1137 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1138 res = drv_add_interface(local, sdata); 1139 if (res) 1140 goto err_stop; 1141 } else if (local->monitors == 0 && local->open_count == 0) { 1142 res = ieee80211_add_virtual_monitor(local); 1143 if (res) 1144 goto err_stop; 1145 } 1146 1147 /* must be before the call to ieee80211_configure_filter */ 1148 local->monitors++; 1149 if (local->monitors == 1) { 1150 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1151 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1152 } 1153 1154 ieee80211_adjust_monitor_flags(sdata, 1); 1155 ieee80211_configure_filter(local); 1156 ieee80211_recalc_offload(local); 1157 mutex_lock(&local->mtx); 1158 ieee80211_recalc_idle(local); 1159 mutex_unlock(&local->mtx); 1160 1161 netif_carrier_on(dev); 1162 break; 1163 default: 1164 if (coming_up) { 1165 ieee80211_del_virtual_monitor(local); 1166 ieee80211_set_sdata_offload_flags(sdata); 1167 1168 res = drv_add_interface(local, sdata); 1169 if (res) 1170 goto err_stop; 1171 1172 ieee80211_set_vif_encap_ops(sdata); 1173 res = ieee80211_check_queues(sdata, 1174 ieee80211_vif_type_p2p(&sdata->vif)); 1175 if (res) 1176 goto err_del_interface; 1177 } 1178 1179 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1180 local->fif_pspoll++; 1181 local->fif_probe_req++; 1182 1183 ieee80211_configure_filter(local); 1184 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1185 local->fif_probe_req++; 1186 } 1187 1188 if (sdata->vif.probe_req_reg) 1189 drv_config_iface_filter(local, sdata, 1190 FIF_PROBE_REQ, 1191 FIF_PROBE_REQ); 1192 1193 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1194 sdata->vif.type != NL80211_IFTYPE_NAN) 1195 changed |= ieee80211_reset_erp_info(sdata); 1196 ieee80211_bss_info_change_notify(sdata, changed); 1197 1198 switch (sdata->vif.type) { 1199 case NL80211_IFTYPE_STATION: 1200 case NL80211_IFTYPE_ADHOC: 1201 case NL80211_IFTYPE_AP: 1202 case NL80211_IFTYPE_MESH_POINT: 1203 case NL80211_IFTYPE_OCB: 1204 netif_carrier_off(dev); 1205 break; 1206 case NL80211_IFTYPE_P2P_DEVICE: 1207 case NL80211_IFTYPE_NAN: 1208 break; 1209 default: 1210 /* not reached */ 1211 WARN_ON(1); 1212 } 1213 1214 /* 1215 * Set default queue parameters so drivers don't 1216 * need to initialise the hardware if the hardware 1217 * doesn't start up with sane defaults. 1218 * Enable QoS for anything but station interfaces. 1219 */ 1220 ieee80211_set_wmm_default(sdata, true, 1221 sdata->vif.type != NL80211_IFTYPE_STATION); 1222 } 1223 1224 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1225 1226 switch (sdata->vif.type) { 1227 case NL80211_IFTYPE_P2P_DEVICE: 1228 rcu_assign_pointer(local->p2p_sdata, sdata); 1229 break; 1230 case NL80211_IFTYPE_MONITOR: 1231 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1232 break; 1233 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1234 break; 1235 default: 1236 break; 1237 } 1238 1239 /* 1240 * set_multicast_list will be invoked by the networking core 1241 * which will check whether any increments here were done in 1242 * error and sync them down to the hardware as filter flags. 1243 */ 1244 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1245 atomic_inc(&local->iff_allmultis); 1246 1247 if (coming_up) 1248 local->open_count++; 1249 1250 if (hw_reconf_flags) 1251 ieee80211_hw_config(local, hw_reconf_flags); 1252 1253 ieee80211_recalc_ps(local); 1254 1255 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 1256 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1257 local->ops->wake_tx_queue) { 1258 /* XXX: for AP_VLAN, actually track AP queues */ 1259 if (dev) 1260 netif_tx_start_all_queues(dev); 1261 } else if (dev) { 1262 unsigned long flags; 1263 int n_acs = IEEE80211_NUM_ACS; 1264 int ac; 1265 1266 if (local->hw.queues < IEEE80211_NUM_ACS) 1267 n_acs = 1; 1268 1269 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1270 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 1271 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 1272 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 1273 for (ac = 0; ac < n_acs; ac++) { 1274 int ac_queue = sdata->vif.hw_queue[ac]; 1275 1276 if (local->queue_stop_reasons[ac_queue] == 0 && 1277 skb_queue_empty(&local->pending[ac_queue])) 1278 netif_start_subqueue(dev, ac); 1279 } 1280 } 1281 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1282 } 1283 1284 return 0; 1285 err_del_interface: 1286 drv_remove_interface(local, sdata); 1287 err_stop: 1288 if (!local->open_count) 1289 drv_stop(local); 1290 err_del_bss: 1291 sdata->bss = NULL; 1292 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1293 mutex_lock(&local->mtx); 1294 list_del(&sdata->u.vlan.list); 1295 mutex_unlock(&local->mtx); 1296 } 1297 /* might already be clear but that doesn't matter */ 1298 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1299 return res; 1300 } 1301 1302 static void ieee80211_if_free(struct net_device *dev) 1303 { 1304 free_percpu(dev->tstats); 1305 } 1306 1307 static void ieee80211_if_setup(struct net_device *dev) 1308 { 1309 ether_setup(dev); 1310 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1311 dev->netdev_ops = &ieee80211_dataif_ops; 1312 dev->needs_free_netdev = true; 1313 dev->priv_destructor = ieee80211_if_free; 1314 } 1315 1316 static void ieee80211_if_setup_no_queue(struct net_device *dev) 1317 { 1318 ieee80211_if_setup(dev); 1319 dev->priv_flags |= IFF_NO_QUEUE; 1320 } 1321 1322 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1323 struct ieee80211_sub_if_data *sdata, 1324 struct sk_buff *skb) 1325 { 1326 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1327 1328 if (ieee80211_is_action(mgmt->frame_control) && 1329 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1330 struct sta_info *sta; 1331 int len = skb->len; 1332 1333 mutex_lock(&local->sta_mtx); 1334 sta = sta_info_get_bss(sdata, mgmt->sa); 1335 if (sta) { 1336 switch (mgmt->u.action.u.addba_req.action_code) { 1337 case WLAN_ACTION_ADDBA_REQ: 1338 ieee80211_process_addba_request(local, sta, 1339 mgmt, len); 1340 break; 1341 case WLAN_ACTION_ADDBA_RESP: 1342 ieee80211_process_addba_resp(local, sta, 1343 mgmt, len); 1344 break; 1345 case WLAN_ACTION_DELBA: 1346 ieee80211_process_delba(sdata, sta, 1347 mgmt, len); 1348 break; 1349 default: 1350 WARN_ON(1); 1351 break; 1352 } 1353 } 1354 mutex_unlock(&local->sta_mtx); 1355 } else if (ieee80211_is_action(mgmt->frame_control) && 1356 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1357 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1358 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1359 struct ieee80211_rx_status *status; 1360 enum nl80211_band band; 1361 struct sta_info *sta; 1362 u8 opmode; 1363 1364 status = IEEE80211_SKB_RXCB(skb); 1365 band = status->band; 1366 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1367 1368 mutex_lock(&local->sta_mtx); 1369 sta = sta_info_get_bss(sdata, mgmt->sa); 1370 1371 if (sta) 1372 ieee80211_vht_handle_opmode(sdata, sta, opmode, 1373 band); 1374 1375 mutex_unlock(&local->sta_mtx); 1376 break; 1377 } 1378 case WLAN_VHT_ACTION_GROUPID_MGMT: 1379 ieee80211_process_mu_groups(sdata, mgmt); 1380 break; 1381 default: 1382 WARN_ON(1); 1383 break; 1384 } 1385 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1386 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1387 ieee80211_sta_rx_queued_ext(sdata, skb); 1388 else 1389 WARN_ON(1); 1390 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1391 struct ieee80211_hdr *hdr = (void *)mgmt; 1392 struct sta_info *sta; 1393 1394 /* 1395 * So the frame isn't mgmt, but frame_control 1396 * is at the right place anyway, of course, so 1397 * the if statement is correct. 1398 * 1399 * Warn if we have other data frame types here, 1400 * they must not get here. 1401 */ 1402 WARN_ON(hdr->frame_control & 1403 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1404 WARN_ON(!(hdr->seq_ctrl & 1405 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1406 /* 1407 * This was a fragment of a frame, received while 1408 * a block-ack session was active. That cannot be 1409 * right, so terminate the session. 1410 */ 1411 mutex_lock(&local->sta_mtx); 1412 sta = sta_info_get_bss(sdata, mgmt->sa); 1413 if (sta) { 1414 u16 tid = ieee80211_get_tid(hdr); 1415 1416 __ieee80211_stop_rx_ba_session( 1417 sta, tid, WLAN_BACK_RECIPIENT, 1418 WLAN_REASON_QSTA_REQUIRE_SETUP, 1419 true); 1420 } 1421 mutex_unlock(&local->sta_mtx); 1422 } else switch (sdata->vif.type) { 1423 case NL80211_IFTYPE_STATION: 1424 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1425 break; 1426 case NL80211_IFTYPE_ADHOC: 1427 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1428 break; 1429 case NL80211_IFTYPE_MESH_POINT: 1430 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1431 break; 1432 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1433 break; 1434 default: 1435 WARN(1, "frame for unexpected interface type"); 1436 break; 1437 } 1438 } 1439 1440 static void ieee80211_iface_work(struct work_struct *work) 1441 { 1442 struct ieee80211_sub_if_data *sdata = 1443 container_of(work, struct ieee80211_sub_if_data, work); 1444 struct ieee80211_local *local = sdata->local; 1445 struct sk_buff *skb; 1446 1447 if (!ieee80211_sdata_running(sdata)) 1448 return; 1449 1450 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1451 return; 1452 1453 if (!ieee80211_can_run_worker(local)) 1454 return; 1455 1456 /* first process frames */ 1457 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1458 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1459 1460 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1461 ieee80211_process_tdls_channel_switch(sdata, skb); 1462 else 1463 ieee80211_iface_process_skb(local, sdata, skb); 1464 1465 kfree_skb(skb); 1466 kcov_remote_stop(); 1467 } 1468 1469 /* then other type-dependent work */ 1470 switch (sdata->vif.type) { 1471 case NL80211_IFTYPE_STATION: 1472 ieee80211_sta_work(sdata); 1473 break; 1474 case NL80211_IFTYPE_ADHOC: 1475 ieee80211_ibss_work(sdata); 1476 break; 1477 case NL80211_IFTYPE_MESH_POINT: 1478 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1479 break; 1480 ieee80211_mesh_work(sdata); 1481 break; 1482 case NL80211_IFTYPE_OCB: 1483 ieee80211_ocb_work(sdata); 1484 break; 1485 default: 1486 break; 1487 } 1488 } 1489 1490 static void ieee80211_recalc_smps_work(struct work_struct *work) 1491 { 1492 struct ieee80211_sub_if_data *sdata = 1493 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1494 1495 ieee80211_recalc_smps(sdata); 1496 } 1497 1498 /* 1499 * Helper function to initialise an interface to a specific type. 1500 */ 1501 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1502 enum nl80211_iftype type) 1503 { 1504 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1505 0xff, 0xff, 0xff}; 1506 1507 /* clear type-dependent union */ 1508 memset(&sdata->u, 0, sizeof(sdata->u)); 1509 1510 /* and set some type-dependent values */ 1511 sdata->vif.type = type; 1512 sdata->vif.p2p = false; 1513 sdata->wdev.iftype = type; 1514 1515 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1516 sdata->control_port_no_encrypt = false; 1517 sdata->control_port_over_nl80211 = false; 1518 sdata->control_port_no_preauth = false; 1519 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1520 sdata->vif.bss_conf.idle = true; 1521 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1522 1523 sdata->noack_map = 0; 1524 1525 /* only monitor/p2p-device differ */ 1526 if (sdata->dev) { 1527 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1528 sdata->dev->type = ARPHRD_ETHER; 1529 } 1530 1531 skb_queue_head_init(&sdata->skb_queue); 1532 INIT_WORK(&sdata->work, ieee80211_iface_work); 1533 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1534 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1535 INIT_WORK(&sdata->color_change_finalize_work, ieee80211_color_change_finalize_work); 1536 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1537 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1538 1539 switch (type) { 1540 case NL80211_IFTYPE_P2P_GO: 1541 type = NL80211_IFTYPE_AP; 1542 sdata->vif.type = type; 1543 sdata->vif.p2p = true; 1544 fallthrough; 1545 case NL80211_IFTYPE_AP: 1546 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1547 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1548 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1549 break; 1550 case NL80211_IFTYPE_P2P_CLIENT: 1551 type = NL80211_IFTYPE_STATION; 1552 sdata->vif.type = type; 1553 sdata->vif.p2p = true; 1554 fallthrough; 1555 case NL80211_IFTYPE_STATION: 1556 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1557 ieee80211_sta_setup_sdata(sdata); 1558 break; 1559 case NL80211_IFTYPE_OCB: 1560 sdata->vif.bss_conf.bssid = bssid_wildcard; 1561 ieee80211_ocb_setup_sdata(sdata); 1562 break; 1563 case NL80211_IFTYPE_ADHOC: 1564 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1565 ieee80211_ibss_setup_sdata(sdata); 1566 break; 1567 case NL80211_IFTYPE_MESH_POINT: 1568 if (ieee80211_vif_is_mesh(&sdata->vif)) 1569 ieee80211_mesh_init_sdata(sdata); 1570 break; 1571 case NL80211_IFTYPE_MONITOR: 1572 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1573 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1574 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1575 MONITOR_FLAG_OTHER_BSS; 1576 break; 1577 case NL80211_IFTYPE_NAN: 1578 idr_init(&sdata->u.nan.function_inst_ids); 1579 spin_lock_init(&sdata->u.nan.func_lock); 1580 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1581 break; 1582 case NL80211_IFTYPE_AP_VLAN: 1583 case NL80211_IFTYPE_P2P_DEVICE: 1584 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1585 break; 1586 case NL80211_IFTYPE_UNSPECIFIED: 1587 case NL80211_IFTYPE_WDS: 1588 case NUM_NL80211_IFTYPES: 1589 WARN_ON(1); 1590 break; 1591 } 1592 1593 ieee80211_debugfs_add_netdev(sdata); 1594 } 1595 1596 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1597 enum nl80211_iftype type) 1598 { 1599 struct ieee80211_local *local = sdata->local; 1600 int ret, err; 1601 enum nl80211_iftype internal_type = type; 1602 bool p2p = false; 1603 1604 ASSERT_RTNL(); 1605 1606 if (!local->ops->change_interface) 1607 return -EBUSY; 1608 1609 switch (sdata->vif.type) { 1610 case NL80211_IFTYPE_AP: 1611 if (!list_empty(&sdata->u.ap.vlans)) 1612 return -EBUSY; 1613 break; 1614 case NL80211_IFTYPE_STATION: 1615 case NL80211_IFTYPE_ADHOC: 1616 case NL80211_IFTYPE_OCB: 1617 /* 1618 * Could maybe also all others here? 1619 * Just not sure how that interacts 1620 * with the RX/config path e.g. for 1621 * mesh. 1622 */ 1623 break; 1624 default: 1625 return -EBUSY; 1626 } 1627 1628 switch (type) { 1629 case NL80211_IFTYPE_AP: 1630 case NL80211_IFTYPE_STATION: 1631 case NL80211_IFTYPE_ADHOC: 1632 case NL80211_IFTYPE_OCB: 1633 /* 1634 * Could probably support everything 1635 * but here. 1636 */ 1637 break; 1638 case NL80211_IFTYPE_P2P_CLIENT: 1639 p2p = true; 1640 internal_type = NL80211_IFTYPE_STATION; 1641 break; 1642 case NL80211_IFTYPE_P2P_GO: 1643 p2p = true; 1644 internal_type = NL80211_IFTYPE_AP; 1645 break; 1646 default: 1647 return -EBUSY; 1648 } 1649 1650 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1651 if (ret) 1652 return ret; 1653 1654 ieee80211_stop_vif_queues(local, sdata, 1655 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1656 synchronize_net(); 1657 1658 ieee80211_do_stop(sdata, false); 1659 1660 ieee80211_teardown_sdata(sdata); 1661 1662 ieee80211_set_sdata_offload_flags(sdata); 1663 ret = drv_change_interface(local, sdata, internal_type, p2p); 1664 if (ret) 1665 type = ieee80211_vif_type_p2p(&sdata->vif); 1666 1667 /* 1668 * Ignore return value here, there's not much we can do since 1669 * the driver changed the interface type internally already. 1670 * The warnings will hopefully make driver authors fix it :-) 1671 */ 1672 ieee80211_check_queues(sdata, type); 1673 1674 ieee80211_setup_sdata(sdata, type); 1675 ieee80211_set_vif_encap_ops(sdata); 1676 1677 err = ieee80211_do_open(&sdata->wdev, false); 1678 WARN(err, "type change: do_open returned %d", err); 1679 1680 ieee80211_wake_vif_queues(local, sdata, 1681 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1682 return ret; 1683 } 1684 1685 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1686 enum nl80211_iftype type) 1687 { 1688 int ret; 1689 1690 ASSERT_RTNL(); 1691 1692 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1693 return 0; 1694 1695 if (ieee80211_sdata_running(sdata)) { 1696 ret = ieee80211_runtime_change_iftype(sdata, type); 1697 if (ret) 1698 return ret; 1699 } else { 1700 /* Purge and reset type-dependent state. */ 1701 ieee80211_teardown_sdata(sdata); 1702 ieee80211_setup_sdata(sdata, type); 1703 } 1704 1705 /* reset some values that shouldn't be kept across type changes */ 1706 if (type == NL80211_IFTYPE_STATION) 1707 sdata->u.mgd.use_4addr = false; 1708 1709 return 0; 1710 } 1711 1712 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1713 u8 *perm_addr, enum nl80211_iftype type) 1714 { 1715 struct ieee80211_sub_if_data *sdata; 1716 u64 mask, start, addr, val, inc; 1717 u8 *m; 1718 u8 tmp_addr[ETH_ALEN]; 1719 int i; 1720 1721 /* default ... something at least */ 1722 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1723 1724 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1725 local->hw.wiphy->n_addresses <= 1) 1726 return; 1727 1728 mutex_lock(&local->iflist_mtx); 1729 1730 switch (type) { 1731 case NL80211_IFTYPE_MONITOR: 1732 /* doesn't matter */ 1733 break; 1734 case NL80211_IFTYPE_AP_VLAN: 1735 /* match up with an AP interface */ 1736 list_for_each_entry(sdata, &local->interfaces, list) { 1737 if (sdata->vif.type != NL80211_IFTYPE_AP) 1738 continue; 1739 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1740 break; 1741 } 1742 /* keep default if no AP interface present */ 1743 break; 1744 case NL80211_IFTYPE_P2P_CLIENT: 1745 case NL80211_IFTYPE_P2P_GO: 1746 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1747 list_for_each_entry(sdata, &local->interfaces, list) { 1748 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1749 continue; 1750 if (!ieee80211_sdata_running(sdata)) 1751 continue; 1752 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1753 goto out_unlock; 1754 } 1755 } 1756 fallthrough; 1757 default: 1758 /* assign a new address if possible -- try n_addresses first */ 1759 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1760 bool used = false; 1761 1762 list_for_each_entry(sdata, &local->interfaces, list) { 1763 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1764 sdata->vif.addr)) { 1765 used = true; 1766 break; 1767 } 1768 } 1769 1770 if (!used) { 1771 memcpy(perm_addr, 1772 local->hw.wiphy->addresses[i].addr, 1773 ETH_ALEN); 1774 break; 1775 } 1776 } 1777 1778 /* try mask if available */ 1779 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1780 break; 1781 1782 m = local->hw.wiphy->addr_mask; 1783 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1784 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1785 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1786 1787 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1788 /* not a contiguous mask ... not handled now! */ 1789 pr_info("not contiguous\n"); 1790 break; 1791 } 1792 1793 /* 1794 * Pick address of existing interface in case user changed 1795 * MAC address manually, default to perm_addr. 1796 */ 1797 m = local->hw.wiphy->perm_addr; 1798 list_for_each_entry(sdata, &local->interfaces, list) { 1799 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1800 continue; 1801 m = sdata->vif.addr; 1802 break; 1803 } 1804 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1805 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1806 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1807 1808 inc = 1ULL<<__ffs64(mask); 1809 val = (start & mask); 1810 addr = (start & ~mask) | (val & mask); 1811 do { 1812 bool used = false; 1813 1814 tmp_addr[5] = addr >> 0*8; 1815 tmp_addr[4] = addr >> 1*8; 1816 tmp_addr[3] = addr >> 2*8; 1817 tmp_addr[2] = addr >> 3*8; 1818 tmp_addr[1] = addr >> 4*8; 1819 tmp_addr[0] = addr >> 5*8; 1820 1821 val += inc; 1822 1823 list_for_each_entry(sdata, &local->interfaces, list) { 1824 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1825 used = true; 1826 break; 1827 } 1828 } 1829 1830 if (!used) { 1831 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1832 break; 1833 } 1834 addr = (start & ~mask) | (val & mask); 1835 } while (addr != start); 1836 1837 break; 1838 } 1839 1840 out_unlock: 1841 mutex_unlock(&local->iflist_mtx); 1842 } 1843 1844 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1845 unsigned char name_assign_type, 1846 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1847 struct vif_params *params) 1848 { 1849 struct net_device *ndev = NULL; 1850 struct ieee80211_sub_if_data *sdata = NULL; 1851 struct txq_info *txqi; 1852 void (*if_setup)(struct net_device *dev); 1853 int ret, i; 1854 int txqs = 1; 1855 1856 ASSERT_RTNL(); 1857 1858 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 1859 struct wireless_dev *wdev; 1860 1861 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1862 GFP_KERNEL); 1863 if (!sdata) 1864 return -ENOMEM; 1865 wdev = &sdata->wdev; 1866 1867 sdata->dev = NULL; 1868 strlcpy(sdata->name, name, IFNAMSIZ); 1869 ieee80211_assign_perm_addr(local, wdev->address, type); 1870 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1871 } else { 1872 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 1873 sizeof(void *)); 1874 int txq_size = 0; 1875 1876 if (local->ops->wake_tx_queue && 1877 type != NL80211_IFTYPE_AP_VLAN && 1878 (type != NL80211_IFTYPE_MONITOR || 1879 (params->flags & MONITOR_FLAG_ACTIVE))) 1880 txq_size += sizeof(struct txq_info) + 1881 local->hw.txq_data_size; 1882 1883 if (local->ops->wake_tx_queue) { 1884 if_setup = ieee80211_if_setup_no_queue; 1885 } else { 1886 if_setup = ieee80211_if_setup; 1887 if (local->hw.queues >= IEEE80211_NUM_ACS) 1888 txqs = IEEE80211_NUM_ACS; 1889 } 1890 1891 ndev = alloc_netdev_mqs(size + txq_size, 1892 name, name_assign_type, 1893 if_setup, txqs, 1); 1894 if (!ndev) 1895 return -ENOMEM; 1896 1897 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len) 1898 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len; 1899 1900 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1901 1902 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1903 if (!ndev->tstats) { 1904 free_netdev(ndev); 1905 return -ENOMEM; 1906 } 1907 1908 ndev->needed_headroom = local->tx_headroom + 1909 4*6 /* four MAC addresses */ 1910 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1911 + 6 /* mesh */ 1912 + 8 /* rfc1042/bridge tunnel */ 1913 - ETH_HLEN /* ethernet hard_header_len */ 1914 + IEEE80211_ENCRYPT_HEADROOM; 1915 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1916 1917 ret = dev_alloc_name(ndev, ndev->name); 1918 if (ret < 0) { 1919 ieee80211_if_free(ndev); 1920 free_netdev(ndev); 1921 return ret; 1922 } 1923 1924 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1925 if (is_valid_ether_addr(params->macaddr)) 1926 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN); 1927 else 1928 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1929 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1930 1931 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1932 sdata = netdev_priv(ndev); 1933 ndev->ieee80211_ptr = &sdata->wdev; 1934 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1935 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1936 1937 if (txq_size) { 1938 txqi = netdev_priv(ndev) + size; 1939 ieee80211_txq_init(sdata, NULL, txqi, 0); 1940 } 1941 1942 sdata->dev = ndev; 1943 } 1944 1945 /* initialise type-independent data */ 1946 sdata->wdev.wiphy = local->hw.wiphy; 1947 sdata->local = local; 1948 1949 ieee80211_init_frag_cache(&sdata->frags); 1950 1951 INIT_LIST_HEAD(&sdata->key_list); 1952 1953 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1954 ieee80211_dfs_cac_timer_work); 1955 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1956 ieee80211_delayed_tailroom_dec); 1957 1958 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1959 struct ieee80211_supported_band *sband; 1960 sband = local->hw.wiphy->bands[i]; 1961 sdata->rc_rateidx_mask[i] = 1962 sband ? (1 << sband->n_bitrates) - 1 : 0; 1963 if (sband) { 1964 __le16 cap; 1965 u16 *vht_rate_mask; 1966 1967 memcpy(sdata->rc_rateidx_mcs_mask[i], 1968 sband->ht_cap.mcs.rx_mask, 1969 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1970 1971 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 1972 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 1973 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 1974 } else { 1975 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1976 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1977 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 1978 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 1979 } 1980 } 1981 1982 for (i = 0; i < IEEE80211_NUM_ACS; i++) 1983 init_airtime_info(&sdata->airtime[i], &local->airtime[i]); 1984 1985 ieee80211_set_default_queues(sdata); 1986 1987 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1988 sdata->user_power_level = local->user_power_level; 1989 1990 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1991 1992 /* setup type-dependent data */ 1993 ieee80211_setup_sdata(sdata, type); 1994 1995 if (ndev) { 1996 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1997 if (type == NL80211_IFTYPE_STATION) 1998 sdata->u.mgd.use_4addr = params->use_4addr; 1999 2000 ndev->features |= local->hw.netdev_features; 2001 ndev->hw_features |= ndev->features & 2002 MAC80211_SUPPORTED_FEATURES_TX; 2003 2004 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2005 2006 /* MTU range is normally 256 - 2304, where the upper limit is 2007 * the maximum MSDU size. Monitor interfaces send and receive 2008 * MPDU and A-MSDU frames which may be much larger so we do 2009 * not impose an upper limit in that case. 2010 */ 2011 ndev->min_mtu = 256; 2012 if (type == NL80211_IFTYPE_MONITOR) 2013 ndev->max_mtu = 0; 2014 else 2015 ndev->max_mtu = local->hw.max_mtu; 2016 2017 ret = cfg80211_register_netdevice(ndev); 2018 if (ret) { 2019 free_netdev(ndev); 2020 return ret; 2021 } 2022 } 2023 2024 mutex_lock(&local->iflist_mtx); 2025 list_add_tail_rcu(&sdata->list, &local->interfaces); 2026 mutex_unlock(&local->iflist_mtx); 2027 2028 if (new_wdev) 2029 *new_wdev = &sdata->wdev; 2030 2031 return 0; 2032 } 2033 2034 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2035 { 2036 ASSERT_RTNL(); 2037 2038 mutex_lock(&sdata->local->iflist_mtx); 2039 list_del_rcu(&sdata->list); 2040 mutex_unlock(&sdata->local->iflist_mtx); 2041 2042 if (sdata->vif.txq) 2043 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2044 2045 synchronize_rcu(); 2046 2047 cfg80211_unregister_wdev(&sdata->wdev); 2048 2049 if (!sdata->dev) { 2050 ieee80211_teardown_sdata(sdata); 2051 kfree(sdata); 2052 } 2053 } 2054 2055 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2056 { 2057 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2058 return; 2059 ieee80211_do_stop(sdata, true); 2060 } 2061 2062 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2063 { 2064 struct ieee80211_sub_if_data *sdata, *tmp; 2065 LIST_HEAD(unreg_list); 2066 LIST_HEAD(wdev_list); 2067 2068 ASSERT_RTNL(); 2069 2070 /* Before destroying the interfaces, make sure they're all stopped so 2071 * that the hardware is stopped. Otherwise, the driver might still be 2072 * iterating the interfaces during the shutdown, e.g. from a worker 2073 * or from RX processing or similar, and if it does so (using atomic 2074 * iteration) while we're manipulating the list, the iteration will 2075 * crash. 2076 * 2077 * After this, the hardware should be stopped and the driver should 2078 * have stopped all of its activities, so that we can do RCU-unaware 2079 * manipulations of the interface list below. 2080 */ 2081 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2082 2083 WARN(local->open_count, "%s: open count remains %d\n", 2084 wiphy_name(local->hw.wiphy), local->open_count); 2085 2086 ieee80211_txq_teardown_flows(local); 2087 2088 mutex_lock(&local->iflist_mtx); 2089 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 2090 list_del(&sdata->list); 2091 2092 if (sdata->dev) 2093 unregister_netdevice_queue(sdata->dev, &unreg_list); 2094 else 2095 list_add(&sdata->list, &wdev_list); 2096 } 2097 mutex_unlock(&local->iflist_mtx); 2098 2099 unregister_netdevice_many(&unreg_list); 2100 2101 wiphy_lock(local->hw.wiphy); 2102 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 2103 list_del(&sdata->list); 2104 cfg80211_unregister_wdev(&sdata->wdev); 2105 kfree(sdata); 2106 } 2107 wiphy_unlock(local->hw.wiphy); 2108 } 2109 2110 static int netdev_notify(struct notifier_block *nb, 2111 unsigned long state, void *ptr) 2112 { 2113 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2114 struct ieee80211_sub_if_data *sdata; 2115 2116 if (state != NETDEV_CHANGENAME) 2117 return NOTIFY_DONE; 2118 2119 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2120 return NOTIFY_DONE; 2121 2122 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2123 return NOTIFY_DONE; 2124 2125 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2126 memcpy(sdata->name, dev->name, IFNAMSIZ); 2127 ieee80211_debugfs_rename_netdev(sdata); 2128 2129 return NOTIFY_OK; 2130 } 2131 2132 static struct notifier_block mac80211_netdev_notifier = { 2133 .notifier_call = netdev_notify, 2134 }; 2135 2136 int ieee80211_iface_init(void) 2137 { 2138 return register_netdevice_notifier(&mac80211_netdev_notifier); 2139 } 2140 2141 void ieee80211_iface_exit(void) 2142 { 2143 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2144 } 2145 2146 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2147 { 2148 if (sdata->vif.type == NL80211_IFTYPE_AP) 2149 atomic_inc(&sdata->u.ap.num_mcast_sta); 2150 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2151 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2152 } 2153 2154 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2155 { 2156 if (sdata->vif.type == NL80211_IFTYPE_AP) 2157 atomic_dec(&sdata->u.ap.num_mcast_sta); 2158 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2159 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2160 } 2161