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) 2018-2020 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 <net/mac80211.h> 19 #include <net/ieee80211_radiotap.h> 20 #include "ieee80211_i.h" 21 #include "sta_info.h" 22 #include "debugfs_netdev.h" 23 #include "mesh.h" 24 #include "led.h" 25 #include "driver-ops.h" 26 #include "wme.h" 27 #include "rate.h" 28 29 /** 30 * DOC: Interface list locking 31 * 32 * The interface list in each struct ieee80211_local is protected 33 * three-fold: 34 * 35 * (1) modifications may only be done under the RTNL 36 * (2) modifications and readers are protected against each other by 37 * the iflist_mtx. 38 * (3) 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 iflist_mtx or RCU. 43 */ 44 45 static void ieee80211_iface_work(struct work_struct *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.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->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 63 power = min(power, sdata->user_power_level); 64 65 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 66 power = min(power, sdata->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_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 83 } 84 85 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 86 { 87 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 88 return 0; 89 90 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 91 return IEEE80211_CONF_CHANGE_IDLE; 92 } 93 94 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 95 { 96 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 97 return 0; 98 99 ieee80211_flush_queues(local, NULL, false); 100 101 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 102 return IEEE80211_CONF_CHANGE_IDLE; 103 } 104 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 106 bool force_active) 107 { 108 bool working, scanning, active; 109 unsigned int led_trig_start = 0, led_trig_stop = 0; 110 111 lockdep_assert_held(&local->mtx); 112 113 active = force_active || 114 !list_empty(&local->chanctx_list) || 115 local->monitors; 116 117 working = !local->ops->remain_on_channel && 118 !list_empty(&local->roc_list); 119 120 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 121 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 122 123 if (working || scanning) 124 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 125 else 126 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 127 128 if (active) 129 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 130 else 131 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 132 133 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 134 135 if (working || scanning || active) 136 return __ieee80211_idle_off(local); 137 return __ieee80211_idle_on(local); 138 } 139 140 u32 ieee80211_idle_off(struct ieee80211_local *local) 141 { 142 return __ieee80211_recalc_idle(local, true); 143 } 144 145 void ieee80211_recalc_idle(struct ieee80211_local *local) 146 { 147 u32 change = __ieee80211_recalc_idle(local, false); 148 if (change) 149 ieee80211_hw_config(local, change); 150 } 151 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 153 bool check_dup) 154 { 155 struct ieee80211_local *local = sdata->local; 156 struct ieee80211_sub_if_data *iter; 157 u64 new, mask, tmp; 158 u8 *m; 159 int ret = 0; 160 161 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 162 return 0; 163 164 m = addr; 165 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 166 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 167 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 168 169 m = local->hw.wiphy->addr_mask; 170 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 171 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 172 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 173 174 if (!check_dup) 175 return ret; 176 177 mutex_lock(&local->iflist_mtx); 178 list_for_each_entry(iter, &local->interfaces, list) { 179 if (iter == sdata) 180 continue; 181 182 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 183 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 184 continue; 185 186 m = iter->vif.addr; 187 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 188 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 189 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 190 191 if ((new & ~mask) != (tmp & ~mask)) { 192 ret = -EINVAL; 193 break; 194 } 195 } 196 mutex_unlock(&local->iflist_mtx); 197 198 return ret; 199 } 200 201 static int ieee80211_change_mac(struct net_device *dev, void *addr) 202 { 203 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 204 struct sockaddr *sa = addr; 205 bool check_dup = true; 206 int ret; 207 208 if (ieee80211_sdata_running(sdata)) 209 return -EBUSY; 210 211 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 212 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 213 check_dup = false; 214 215 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 216 if (ret) 217 return ret; 218 219 ret = eth_mac_addr(dev, sa); 220 221 if (ret == 0) 222 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 223 224 return ret; 225 } 226 227 static inline int identical_mac_addr_allowed(int type1, int type2) 228 { 229 return type1 == NL80211_IFTYPE_MONITOR || 230 type2 == NL80211_IFTYPE_MONITOR || 231 type1 == NL80211_IFTYPE_P2P_DEVICE || 232 type2 == NL80211_IFTYPE_P2P_DEVICE || 233 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 234 (type1 == NL80211_IFTYPE_WDS && 235 (type2 == NL80211_IFTYPE_WDS || 236 type2 == NL80211_IFTYPE_AP)) || 237 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 238 (type1 == NL80211_IFTYPE_AP_VLAN && 239 (type2 == NL80211_IFTYPE_AP || 240 type2 == NL80211_IFTYPE_AP_VLAN)); 241 } 242 243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 244 enum nl80211_iftype iftype) 245 { 246 struct ieee80211_local *local = sdata->local; 247 struct ieee80211_sub_if_data *nsdata; 248 int ret; 249 250 ASSERT_RTNL(); 251 252 /* we hold the RTNL here so can safely walk the list */ 253 list_for_each_entry(nsdata, &local->interfaces, list) { 254 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 255 /* 256 * Only OCB and monitor mode may coexist 257 */ 258 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 259 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 260 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 261 nsdata->vif.type == NL80211_IFTYPE_OCB)) 262 return -EBUSY; 263 264 /* 265 * Allow only a single IBSS interface to be up at any 266 * time. This is restricted because beacon distribution 267 * cannot work properly if both are in the same IBSS. 268 * 269 * To remove this restriction we'd have to disallow them 270 * from setting the same SSID on different IBSS interfaces 271 * belonging to the same hardware. Then, however, we're 272 * faced with having to adopt two different TSF timers... 273 */ 274 if (iftype == NL80211_IFTYPE_ADHOC && 275 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 276 return -EBUSY; 277 /* 278 * will not add another interface while any channel 279 * switch is active. 280 */ 281 if (nsdata->vif.csa_active) 282 return -EBUSY; 283 284 /* 285 * The remaining checks are only performed for interfaces 286 * with the same MAC address. 287 */ 288 if (!ether_addr_equal(sdata->vif.addr, 289 nsdata->vif.addr)) 290 continue; 291 292 /* 293 * check whether it may have the same address 294 */ 295 if (!identical_mac_addr_allowed(iftype, 296 nsdata->vif.type)) 297 return -ENOTUNIQ; 298 299 /* 300 * can only add VLANs to enabled APs 301 */ 302 if (iftype == NL80211_IFTYPE_AP_VLAN && 303 nsdata->vif.type == NL80211_IFTYPE_AP) 304 sdata->bss = &nsdata->u.ap; 305 } 306 } 307 308 mutex_lock(&local->chanctx_mtx); 309 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 310 mutex_unlock(&local->chanctx_mtx); 311 return ret; 312 } 313 314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 315 enum nl80211_iftype iftype) 316 { 317 int n_queues = sdata->local->hw.queues; 318 int i; 319 320 if (iftype == NL80211_IFTYPE_NAN) 321 return 0; 322 323 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 324 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 325 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 326 IEEE80211_INVAL_HW_QUEUE)) 327 return -EINVAL; 328 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 329 n_queues)) 330 return -EINVAL; 331 } 332 } 333 334 if ((iftype != NL80211_IFTYPE_AP && 335 iftype != NL80211_IFTYPE_P2P_GO && 336 iftype != NL80211_IFTYPE_MESH_POINT) || 337 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 338 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 339 return 0; 340 } 341 342 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 343 return -EINVAL; 344 345 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 346 return -EINVAL; 347 348 return 0; 349 } 350 351 static int ieee80211_open(struct net_device *dev) 352 { 353 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 354 int err; 355 356 /* fail early if user set an invalid address */ 357 if (!is_valid_ether_addr(dev->dev_addr)) 358 return -EADDRNOTAVAIL; 359 360 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 361 if (err) 362 return err; 363 364 return ieee80211_do_open(&sdata->wdev, true); 365 } 366 367 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 368 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 * In WDS mode a station must exist here and be flushed, for 421 * AP_VLANs stations may exist since there's nothing else that 422 * would have removed them, but in other modes there shouldn't 423 * be any stations. 424 */ 425 flushed = sta_info_flush(sdata); 426 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 427 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 428 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1))); 429 430 /* don't count this interface for allmulti while it is down */ 431 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 432 atomic_dec(&local->iff_allmultis); 433 434 if (sdata->vif.type == NL80211_IFTYPE_AP) { 435 local->fif_pspoll--; 436 local->fif_probe_req--; 437 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 438 local->fif_probe_req--; 439 } 440 441 if (sdata->dev) { 442 netif_addr_lock_bh(sdata->dev); 443 spin_lock_bh(&local->filter_lock); 444 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 445 sdata->dev->addr_len); 446 spin_unlock_bh(&local->filter_lock); 447 netif_addr_unlock_bh(sdata->dev); 448 } 449 450 del_timer_sync(&local->dynamic_ps_timer); 451 cancel_work_sync(&local->dynamic_ps_enable_work); 452 453 cancel_work_sync(&sdata->recalc_smps); 454 sdata_lock(sdata); 455 mutex_lock(&local->mtx); 456 sdata->vif.csa_active = false; 457 if (sdata->vif.type == NL80211_IFTYPE_STATION) 458 sdata->u.mgd.csa_waiting_bcn = false; 459 if (sdata->csa_block_tx) { 460 ieee80211_wake_vif_queues(local, sdata, 461 IEEE80211_QUEUE_STOP_REASON_CSA); 462 sdata->csa_block_tx = false; 463 } 464 mutex_unlock(&local->mtx); 465 sdata_unlock(sdata); 466 467 cancel_work_sync(&sdata->csa_finalize_work); 468 469 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 470 471 if (sdata->wdev.cac_started) { 472 chandef = sdata->vif.bss_conf.chandef; 473 WARN_ON(local->suspended); 474 mutex_lock(&local->mtx); 475 ieee80211_vif_release_channel(sdata); 476 mutex_unlock(&local->mtx); 477 cfg80211_cac_event(sdata->dev, &chandef, 478 NL80211_RADAR_CAC_ABORTED, 479 GFP_KERNEL); 480 } 481 482 /* APs need special treatment */ 483 if (sdata->vif.type == NL80211_IFTYPE_AP) { 484 struct ieee80211_sub_if_data *vlan, *tmpsdata; 485 486 /* down all dependent devices, that is VLANs */ 487 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 488 u.vlan.list) 489 dev_close(vlan->dev); 490 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 491 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 492 /* remove all packets in parent bc_buf pointing to this dev */ 493 ps = &sdata->bss->ps; 494 495 spin_lock_irqsave(&ps->bc_buf.lock, flags); 496 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 497 if (skb->dev == sdata->dev) { 498 __skb_unlink(skb, &ps->bc_buf); 499 local->total_ps_buffered--; 500 ieee80211_free_txskb(&local->hw, skb); 501 } 502 } 503 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 504 } 505 506 if (going_down) 507 local->open_count--; 508 509 switch (sdata->vif.type) { 510 case NL80211_IFTYPE_AP_VLAN: 511 mutex_lock(&local->mtx); 512 list_del(&sdata->u.vlan.list); 513 mutex_unlock(&local->mtx); 514 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 515 /* see comment in the default case below */ 516 ieee80211_free_keys(sdata, true); 517 /* no need to tell driver */ 518 break; 519 case NL80211_IFTYPE_MONITOR: 520 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 521 local->cooked_mntrs--; 522 break; 523 } 524 525 local->monitors--; 526 if (local->monitors == 0) { 527 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 528 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 529 } 530 531 ieee80211_adjust_monitor_flags(sdata, -1); 532 break; 533 case NL80211_IFTYPE_NAN: 534 /* clean all the functions */ 535 spin_lock_bh(&sdata->u.nan.func_lock); 536 537 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 538 idr_remove(&sdata->u.nan.function_inst_ids, i); 539 cfg80211_free_nan_func(func); 540 } 541 idr_destroy(&sdata->u.nan.function_inst_ids); 542 543 spin_unlock_bh(&sdata->u.nan.func_lock); 544 break; 545 case NL80211_IFTYPE_P2P_DEVICE: 546 /* relies on synchronize_rcu() below */ 547 RCU_INIT_POINTER(local->p2p_sdata, NULL); 548 fallthrough; 549 default: 550 cancel_work_sync(&sdata->work); 551 /* 552 * When we get here, the interface is marked down. 553 * Free the remaining keys, if there are any 554 * (which can happen in AP mode if userspace sets 555 * keys before the interface is operating, and maybe 556 * also in WDS mode) 557 * 558 * Force the key freeing to always synchronize_net() 559 * to wait for the RX path in case it is using this 560 * interface enqueuing frames at this very time on 561 * another CPU. 562 */ 563 ieee80211_free_keys(sdata, true); 564 skb_queue_purge(&sdata->skb_queue); 565 } 566 567 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 568 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 569 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 570 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 571 if (info->control.vif == &sdata->vif) { 572 __skb_unlink(skb, &local->pending[i]); 573 ieee80211_free_txskb(&local->hw, skb); 574 } 575 } 576 } 577 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 578 579 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 580 ieee80211_txq_remove_vlan(local, sdata); 581 582 sdata->bss = NULL; 583 584 if (local->open_count == 0) 585 ieee80211_clear_tx_pending(local); 586 587 sdata->vif.bss_conf.beacon_int = 0; 588 589 /* 590 * If the interface goes down while suspended, presumably because 591 * the device was unplugged and that happens before our resume, 592 * then the driver is already unconfigured and the remainder of 593 * this function isn't needed. 594 * XXX: what about WoWLAN? If the device has software state, e.g. 595 * memory allocated, it might expect teardown commands from 596 * mac80211 here? 597 */ 598 if (local->suspended) { 599 WARN_ON(local->wowlan); 600 WARN_ON(rtnl_dereference(local->monitor_sdata)); 601 return; 602 } 603 604 switch (sdata->vif.type) { 605 case NL80211_IFTYPE_AP_VLAN: 606 break; 607 case NL80211_IFTYPE_MONITOR: 608 if (local->monitors == 0) 609 ieee80211_del_virtual_monitor(local); 610 611 mutex_lock(&local->mtx); 612 ieee80211_recalc_idle(local); 613 mutex_unlock(&local->mtx); 614 615 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 616 break; 617 618 fallthrough; 619 default: 620 if (going_down) 621 drv_remove_interface(local, sdata); 622 } 623 624 ieee80211_recalc_ps(local); 625 626 if (cancel_scan) 627 flush_delayed_work(&local->scan_work); 628 629 if (local->open_count == 0) { 630 ieee80211_stop_device(local); 631 632 /* no reconfiguring after stop! */ 633 return; 634 } 635 636 /* do after stop to avoid reconfiguring when we stop anyway */ 637 ieee80211_configure_filter(local); 638 ieee80211_hw_config(local, hw_reconf_flags); 639 640 if (local->monitors == local->open_count) 641 ieee80211_add_virtual_monitor(local); 642 } 643 644 static int ieee80211_stop(struct net_device *dev) 645 { 646 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 647 648 ieee80211_do_stop(sdata, true); 649 650 return 0; 651 } 652 653 static void ieee80211_set_multicast_list(struct net_device *dev) 654 { 655 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 656 struct ieee80211_local *local = sdata->local; 657 int allmulti, sdata_allmulti; 658 659 allmulti = !!(dev->flags & IFF_ALLMULTI); 660 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 661 662 if (allmulti != sdata_allmulti) { 663 if (dev->flags & IFF_ALLMULTI) 664 atomic_inc(&local->iff_allmultis); 665 else 666 atomic_dec(&local->iff_allmultis); 667 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 668 } 669 670 spin_lock_bh(&local->filter_lock); 671 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 672 spin_unlock_bh(&local->filter_lock); 673 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 674 } 675 676 /* 677 * Called when the netdev is removed or, by the code below, before 678 * the interface type changes. 679 */ 680 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 681 { 682 int i; 683 684 /* free extra data */ 685 ieee80211_free_keys(sdata, false); 686 687 ieee80211_debugfs_remove_netdev(sdata); 688 689 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 690 __skb_queue_purge(&sdata->fragments[i].skb_list); 691 sdata->fragment_next = 0; 692 693 if (ieee80211_vif_is_mesh(&sdata->vif)) 694 ieee80211_mesh_teardown_sdata(sdata); 695 } 696 697 static void ieee80211_uninit(struct net_device *dev) 698 { 699 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 700 } 701 702 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 703 struct sk_buff *skb, 704 struct net_device *sb_dev) 705 { 706 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 707 } 708 709 static void 710 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 711 { 712 dev_fetch_sw_netstats(stats, dev->tstats); 713 } 714 715 static const struct net_device_ops ieee80211_dataif_ops = { 716 .ndo_open = ieee80211_open, 717 .ndo_stop = ieee80211_stop, 718 .ndo_uninit = ieee80211_uninit, 719 .ndo_start_xmit = ieee80211_subif_start_xmit, 720 .ndo_set_rx_mode = ieee80211_set_multicast_list, 721 .ndo_set_mac_address = ieee80211_change_mac, 722 .ndo_select_queue = ieee80211_netdev_select_queue, 723 .ndo_get_stats64 = ieee80211_get_stats64, 724 }; 725 726 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 727 struct sk_buff *skb, 728 struct net_device *sb_dev) 729 { 730 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 731 struct ieee80211_local *local = sdata->local; 732 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 733 struct ieee80211_hdr *hdr; 734 int len_rthdr; 735 736 if (local->hw.queues < IEEE80211_NUM_ACS) 737 return 0; 738 739 /* reset flags and info before parsing radiotap header */ 740 memset(info, 0, sizeof(*info)); 741 742 if (!ieee80211_parse_tx_radiotap(skb, dev)) 743 return 0; /* doesn't matter, frame will be dropped */ 744 745 len_rthdr = ieee80211_get_radiotap_len(skb->data); 746 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 747 if (skb->len < len_rthdr + 2 || 748 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 749 return 0; /* doesn't matter, frame will be dropped */ 750 751 return ieee80211_select_queue_80211(sdata, skb, hdr); 752 } 753 754 static const struct net_device_ops ieee80211_monitorif_ops = { 755 .ndo_open = ieee80211_open, 756 .ndo_stop = ieee80211_stop, 757 .ndo_uninit = ieee80211_uninit, 758 .ndo_start_xmit = ieee80211_monitor_start_xmit, 759 .ndo_set_rx_mode = ieee80211_set_multicast_list, 760 .ndo_set_mac_address = ieee80211_change_mac, 761 .ndo_select_queue = ieee80211_monitor_select_queue, 762 .ndo_get_stats64 = ieee80211_get_stats64, 763 }; 764 765 static const struct net_device_ops ieee80211_dataif_8023_ops = { 766 .ndo_open = ieee80211_open, 767 .ndo_stop = ieee80211_stop, 768 .ndo_uninit = ieee80211_uninit, 769 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 770 .ndo_set_rx_mode = ieee80211_set_multicast_list, 771 .ndo_set_mac_address = ieee80211_change_mac, 772 .ndo_select_queue = ieee80211_netdev_select_queue, 773 .ndo_get_stats64 = ieee80211_get_stats64, 774 }; 775 776 static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype) 777 { 778 switch (iftype) { 779 /* P2P GO and client are mapped to AP/STATION types */ 780 case NL80211_IFTYPE_AP: 781 case NL80211_IFTYPE_STATION: 782 return true; 783 default: 784 return false; 785 } 786 } 787 788 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 789 { 790 struct ieee80211_local *local = sdata->local; 791 u32 flags; 792 793 flags = sdata->vif.offload_flags; 794 795 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 796 ieee80211_iftype_supports_encap_offload(sdata->vif.type)) { 797 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 798 799 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 800 local->hw.wiphy->frag_threshold != (u32)-1) 801 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 802 803 if (local->monitors) 804 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 805 } else { 806 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 807 } 808 809 if (sdata->vif.offload_flags == flags) 810 return false; 811 812 sdata->vif.offload_flags = flags; 813 return true; 814 } 815 816 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 817 { 818 struct ieee80211_local *local = sdata->local; 819 struct ieee80211_sub_if_data *bss = sdata; 820 bool enabled; 821 822 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 823 if (!sdata->bss) 824 return; 825 826 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 827 } 828 829 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 830 !ieee80211_iftype_supports_encap_offload(bss->vif.type)) 831 return; 832 833 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 834 if (sdata->wdev.use_4addr && 835 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 836 enabled = false; 837 838 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 839 &ieee80211_dataif_ops; 840 } 841 842 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 843 { 844 struct ieee80211_local *local = sdata->local; 845 struct ieee80211_sub_if_data *vsdata; 846 847 if (ieee80211_set_sdata_offload_flags(sdata)) { 848 drv_update_vif_offload(local, sdata); 849 ieee80211_set_vif_encap_ops(sdata); 850 } 851 852 list_for_each_entry(vsdata, &local->interfaces, list) { 853 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 854 vsdata->bss != &sdata->u.ap) 855 continue; 856 857 ieee80211_set_vif_encap_ops(vsdata); 858 } 859 } 860 861 void ieee80211_recalc_offload(struct ieee80211_local *local) 862 { 863 struct ieee80211_sub_if_data *sdata; 864 865 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 866 return; 867 868 mutex_lock(&local->iflist_mtx); 869 870 list_for_each_entry(sdata, &local->interfaces, list) { 871 if (!ieee80211_sdata_running(sdata)) 872 continue; 873 874 ieee80211_recalc_sdata_offload(sdata); 875 } 876 877 mutex_unlock(&local->iflist_mtx); 878 } 879 880 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 881 const int offset) 882 { 883 struct ieee80211_local *local = sdata->local; 884 u32 flags = sdata->u.mntr.flags; 885 886 #define ADJUST(_f, _s) do { \ 887 if (flags & MONITOR_FLAG_##_f) \ 888 local->fif_##_s += offset; \ 889 } while (0) 890 891 ADJUST(FCSFAIL, fcsfail); 892 ADJUST(PLCPFAIL, plcpfail); 893 ADJUST(CONTROL, control); 894 ADJUST(CONTROL, pspoll); 895 ADJUST(OTHER_BSS, other_bss); 896 897 #undef ADJUST 898 } 899 900 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 901 { 902 struct ieee80211_local *local = sdata->local; 903 int i; 904 905 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 906 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 907 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 908 else if (local->hw.queues >= IEEE80211_NUM_ACS) 909 sdata->vif.hw_queue[i] = i; 910 else 911 sdata->vif.hw_queue[i] = 0; 912 } 913 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 914 } 915 916 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 917 { 918 struct ieee80211_sub_if_data *sdata; 919 int ret; 920 921 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 922 return 0; 923 924 ASSERT_RTNL(); 925 926 if (local->monitor_sdata) 927 return 0; 928 929 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 930 if (!sdata) 931 return -ENOMEM; 932 933 /* set up data */ 934 sdata->local = local; 935 sdata->vif.type = NL80211_IFTYPE_MONITOR; 936 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 937 wiphy_name(local->hw.wiphy)); 938 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 939 940 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 941 942 ieee80211_set_default_queues(sdata); 943 944 ret = drv_add_interface(local, sdata); 945 if (WARN_ON(ret)) { 946 /* ok .. stupid driver, it asked for this! */ 947 kfree(sdata); 948 return ret; 949 } 950 951 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 952 if (ret) { 953 kfree(sdata); 954 return ret; 955 } 956 957 mutex_lock(&local->iflist_mtx); 958 rcu_assign_pointer(local->monitor_sdata, sdata); 959 mutex_unlock(&local->iflist_mtx); 960 961 mutex_lock(&local->mtx); 962 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 963 IEEE80211_CHANCTX_EXCLUSIVE); 964 mutex_unlock(&local->mtx); 965 if (ret) { 966 mutex_lock(&local->iflist_mtx); 967 RCU_INIT_POINTER(local->monitor_sdata, NULL); 968 mutex_unlock(&local->iflist_mtx); 969 synchronize_net(); 970 drv_remove_interface(local, sdata); 971 kfree(sdata); 972 return ret; 973 } 974 975 skb_queue_head_init(&sdata->skb_queue); 976 INIT_WORK(&sdata->work, ieee80211_iface_work); 977 978 return 0; 979 } 980 981 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 982 { 983 struct ieee80211_sub_if_data *sdata; 984 985 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 986 return; 987 988 ASSERT_RTNL(); 989 990 mutex_lock(&local->iflist_mtx); 991 992 sdata = rcu_dereference_protected(local->monitor_sdata, 993 lockdep_is_held(&local->iflist_mtx)); 994 if (!sdata) { 995 mutex_unlock(&local->iflist_mtx); 996 return; 997 } 998 999 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1000 mutex_unlock(&local->iflist_mtx); 1001 1002 synchronize_net(); 1003 1004 mutex_lock(&local->mtx); 1005 ieee80211_vif_release_channel(sdata); 1006 mutex_unlock(&local->mtx); 1007 1008 drv_remove_interface(local, sdata); 1009 1010 kfree(sdata); 1011 } 1012 1013 /* 1014 * NOTE: Be very careful when changing this function, it must NOT return 1015 * an error on interface type changes that have been pre-checked, so most 1016 * checks should be in ieee80211_check_concurrent_iface. 1017 */ 1018 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1019 { 1020 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1021 struct net_device *dev = wdev->netdev; 1022 struct ieee80211_local *local = sdata->local; 1023 struct sta_info *sta; 1024 u32 changed = 0; 1025 int res; 1026 u32 hw_reconf_flags = 0; 1027 1028 switch (sdata->vif.type) { 1029 case NL80211_IFTYPE_WDS: 1030 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 1031 return -ENOLINK; 1032 break; 1033 case NL80211_IFTYPE_AP_VLAN: { 1034 struct ieee80211_sub_if_data *master; 1035 1036 if (!sdata->bss) 1037 return -ENOLINK; 1038 1039 mutex_lock(&local->mtx); 1040 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1041 mutex_unlock(&local->mtx); 1042 1043 master = container_of(sdata->bss, 1044 struct ieee80211_sub_if_data, u.ap); 1045 sdata->control_port_protocol = 1046 master->control_port_protocol; 1047 sdata->control_port_no_encrypt = 1048 master->control_port_no_encrypt; 1049 sdata->control_port_over_nl80211 = 1050 master->control_port_over_nl80211; 1051 sdata->control_port_no_preauth = 1052 master->control_port_no_preauth; 1053 sdata->vif.cab_queue = master->vif.cab_queue; 1054 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1055 sizeof(sdata->vif.hw_queue)); 1056 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 1057 1058 mutex_lock(&local->key_mtx); 1059 sdata->crypto_tx_tailroom_needed_cnt += 1060 master->crypto_tx_tailroom_needed_cnt; 1061 mutex_unlock(&local->key_mtx); 1062 1063 break; 1064 } 1065 case NL80211_IFTYPE_AP: 1066 sdata->bss = &sdata->u.ap; 1067 break; 1068 case NL80211_IFTYPE_MESH_POINT: 1069 case NL80211_IFTYPE_STATION: 1070 case NL80211_IFTYPE_MONITOR: 1071 case NL80211_IFTYPE_ADHOC: 1072 case NL80211_IFTYPE_P2P_DEVICE: 1073 case NL80211_IFTYPE_OCB: 1074 case NL80211_IFTYPE_NAN: 1075 /* no special treatment */ 1076 break; 1077 case NL80211_IFTYPE_UNSPECIFIED: 1078 case NUM_NL80211_IFTYPES: 1079 case NL80211_IFTYPE_P2P_CLIENT: 1080 case NL80211_IFTYPE_P2P_GO: 1081 /* cannot happen */ 1082 WARN_ON(1); 1083 break; 1084 } 1085 1086 if (local->open_count == 0) { 1087 res = drv_start(local); 1088 if (res) 1089 goto err_del_bss; 1090 /* we're brought up, everything changes */ 1091 hw_reconf_flags = ~0; 1092 ieee80211_led_radio(local, true); 1093 ieee80211_mod_tpt_led_trig(local, 1094 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1095 } 1096 1097 /* 1098 * Copy the hopefully now-present MAC address to 1099 * this interface, if it has the special null one. 1100 */ 1101 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1102 memcpy(dev->dev_addr, 1103 local->hw.wiphy->perm_addr, 1104 ETH_ALEN); 1105 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1106 1107 if (!is_valid_ether_addr(dev->dev_addr)) { 1108 res = -EADDRNOTAVAIL; 1109 goto err_stop; 1110 } 1111 } 1112 1113 switch (sdata->vif.type) { 1114 case NL80211_IFTYPE_AP_VLAN: 1115 /* no need to tell driver, but set carrier and chanctx */ 1116 if (rtnl_dereference(sdata->bss->beacon)) { 1117 ieee80211_vif_vlan_copy_chanctx(sdata); 1118 netif_carrier_on(dev); 1119 ieee80211_set_vif_encap_ops(sdata); 1120 } else { 1121 netif_carrier_off(dev); 1122 } 1123 break; 1124 case NL80211_IFTYPE_MONITOR: 1125 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1126 local->cooked_mntrs++; 1127 break; 1128 } 1129 1130 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1131 res = drv_add_interface(local, sdata); 1132 if (res) 1133 goto err_stop; 1134 } else if (local->monitors == 0 && local->open_count == 0) { 1135 res = ieee80211_add_virtual_monitor(local); 1136 if (res) 1137 goto err_stop; 1138 } 1139 1140 /* must be before the call to ieee80211_configure_filter */ 1141 local->monitors++; 1142 if (local->monitors == 1) { 1143 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1144 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1145 } 1146 1147 ieee80211_adjust_monitor_flags(sdata, 1); 1148 ieee80211_configure_filter(local); 1149 ieee80211_recalc_offload(local); 1150 mutex_lock(&local->mtx); 1151 ieee80211_recalc_idle(local); 1152 mutex_unlock(&local->mtx); 1153 1154 netif_carrier_on(dev); 1155 break; 1156 default: 1157 if (coming_up) { 1158 ieee80211_del_virtual_monitor(local); 1159 ieee80211_set_sdata_offload_flags(sdata); 1160 1161 res = drv_add_interface(local, sdata); 1162 if (res) 1163 goto err_stop; 1164 1165 ieee80211_set_vif_encap_ops(sdata); 1166 res = ieee80211_check_queues(sdata, 1167 ieee80211_vif_type_p2p(&sdata->vif)); 1168 if (res) 1169 goto err_del_interface; 1170 } 1171 1172 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1173 local->fif_pspoll++; 1174 local->fif_probe_req++; 1175 1176 ieee80211_configure_filter(local); 1177 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1178 local->fif_probe_req++; 1179 } 1180 1181 if (sdata->vif.probe_req_reg) 1182 drv_config_iface_filter(local, sdata, 1183 FIF_PROBE_REQ, 1184 FIF_PROBE_REQ); 1185 1186 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1187 sdata->vif.type != NL80211_IFTYPE_NAN) 1188 changed |= ieee80211_reset_erp_info(sdata); 1189 ieee80211_bss_info_change_notify(sdata, changed); 1190 1191 switch (sdata->vif.type) { 1192 case NL80211_IFTYPE_STATION: 1193 case NL80211_IFTYPE_ADHOC: 1194 case NL80211_IFTYPE_AP: 1195 case NL80211_IFTYPE_MESH_POINT: 1196 case NL80211_IFTYPE_OCB: 1197 netif_carrier_off(dev); 1198 break; 1199 case NL80211_IFTYPE_WDS: 1200 case NL80211_IFTYPE_P2P_DEVICE: 1201 case NL80211_IFTYPE_NAN: 1202 break; 1203 default: 1204 /* not reached */ 1205 WARN_ON(1); 1206 } 1207 1208 /* 1209 * Set default queue parameters so drivers don't 1210 * need to initialise the hardware if the hardware 1211 * doesn't start up with sane defaults. 1212 * Enable QoS for anything but station interfaces. 1213 */ 1214 ieee80211_set_wmm_default(sdata, true, 1215 sdata->vif.type != NL80211_IFTYPE_STATION); 1216 } 1217 1218 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1219 1220 switch (sdata->vif.type) { 1221 case NL80211_IFTYPE_WDS: 1222 /* Create STA entry for the WDS peer */ 1223 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 1224 GFP_KERNEL); 1225 if (!sta) { 1226 res = -ENOMEM; 1227 goto err_del_interface; 1228 } 1229 1230 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 1231 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 1232 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 1233 1234 res = sta_info_insert(sta); 1235 if (res) { 1236 /* STA has been freed */ 1237 goto err_del_interface; 1238 } 1239 1240 rate_control_rate_init(sta); 1241 netif_carrier_on(dev); 1242 break; 1243 case NL80211_IFTYPE_P2P_DEVICE: 1244 rcu_assign_pointer(local->p2p_sdata, sdata); 1245 break; 1246 case NL80211_IFTYPE_MONITOR: 1247 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1248 break; 1249 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1250 break; 1251 default: 1252 break; 1253 } 1254 1255 /* 1256 * set_multicast_list will be invoked by the networking core 1257 * which will check whether any increments here were done in 1258 * error and sync them down to the hardware as filter flags. 1259 */ 1260 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1261 atomic_inc(&local->iff_allmultis); 1262 1263 if (coming_up) 1264 local->open_count++; 1265 1266 if (hw_reconf_flags) 1267 ieee80211_hw_config(local, hw_reconf_flags); 1268 1269 ieee80211_recalc_ps(local); 1270 1271 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 1272 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1273 local->ops->wake_tx_queue) { 1274 /* XXX: for AP_VLAN, actually track AP queues */ 1275 if (dev) 1276 netif_tx_start_all_queues(dev); 1277 } else if (dev) { 1278 unsigned long flags; 1279 int n_acs = IEEE80211_NUM_ACS; 1280 int ac; 1281 1282 if (local->hw.queues < IEEE80211_NUM_ACS) 1283 n_acs = 1; 1284 1285 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1286 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 1287 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 1288 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 1289 for (ac = 0; ac < n_acs; ac++) { 1290 int ac_queue = sdata->vif.hw_queue[ac]; 1291 1292 if (local->queue_stop_reasons[ac_queue] == 0 && 1293 skb_queue_empty(&local->pending[ac_queue])) 1294 netif_start_subqueue(dev, ac); 1295 } 1296 } 1297 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1298 } 1299 1300 return 0; 1301 err_del_interface: 1302 drv_remove_interface(local, sdata); 1303 err_stop: 1304 if (!local->open_count) 1305 drv_stop(local); 1306 err_del_bss: 1307 sdata->bss = NULL; 1308 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1309 mutex_lock(&local->mtx); 1310 list_del(&sdata->u.vlan.list); 1311 mutex_unlock(&local->mtx); 1312 } 1313 /* might already be clear but that doesn't matter */ 1314 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1315 return res; 1316 } 1317 1318 static void ieee80211_if_free(struct net_device *dev) 1319 { 1320 free_percpu(dev->tstats); 1321 } 1322 1323 static void ieee80211_if_setup(struct net_device *dev) 1324 { 1325 ether_setup(dev); 1326 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1327 dev->netdev_ops = &ieee80211_dataif_ops; 1328 dev->needs_free_netdev = true; 1329 dev->priv_destructor = ieee80211_if_free; 1330 } 1331 1332 static void ieee80211_if_setup_no_queue(struct net_device *dev) 1333 { 1334 ieee80211_if_setup(dev); 1335 dev->priv_flags |= IFF_NO_QUEUE; 1336 } 1337 1338 static void ieee80211_iface_work(struct work_struct *work) 1339 { 1340 struct ieee80211_sub_if_data *sdata = 1341 container_of(work, struct ieee80211_sub_if_data, work); 1342 struct ieee80211_local *local = sdata->local; 1343 struct sk_buff *skb; 1344 struct sta_info *sta; 1345 1346 if (!ieee80211_sdata_running(sdata)) 1347 return; 1348 1349 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1350 return; 1351 1352 if (!ieee80211_can_run_worker(local)) 1353 return; 1354 1355 /* first process frames */ 1356 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1357 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1358 1359 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1360 if (ieee80211_is_action(mgmt->frame_control) && 1361 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1362 int len = skb->len; 1363 1364 mutex_lock(&local->sta_mtx); 1365 sta = sta_info_get_bss(sdata, mgmt->sa); 1366 if (sta) { 1367 switch (mgmt->u.action.u.addba_req.action_code) { 1368 case WLAN_ACTION_ADDBA_REQ: 1369 ieee80211_process_addba_request( 1370 local, sta, mgmt, len); 1371 break; 1372 case WLAN_ACTION_ADDBA_RESP: 1373 ieee80211_process_addba_resp(local, sta, 1374 mgmt, len); 1375 break; 1376 case WLAN_ACTION_DELBA: 1377 ieee80211_process_delba(sdata, sta, 1378 mgmt, len); 1379 break; 1380 default: 1381 WARN_ON(1); 1382 break; 1383 } 1384 } 1385 mutex_unlock(&local->sta_mtx); 1386 } else if (ieee80211_is_action(mgmt->frame_control) && 1387 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1388 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1389 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1390 struct ieee80211_rx_status *status; 1391 enum nl80211_band band; 1392 u8 opmode; 1393 1394 status = IEEE80211_SKB_RXCB(skb); 1395 band = status->band; 1396 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1397 1398 mutex_lock(&local->sta_mtx); 1399 sta = sta_info_get_bss(sdata, mgmt->sa); 1400 1401 if (sta) 1402 ieee80211_vht_handle_opmode(sdata, sta, 1403 opmode, 1404 band); 1405 1406 mutex_unlock(&local->sta_mtx); 1407 break; 1408 } 1409 case WLAN_VHT_ACTION_GROUPID_MGMT: 1410 ieee80211_process_mu_groups(sdata, mgmt); 1411 break; 1412 default: 1413 WARN_ON(1); 1414 break; 1415 } 1416 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1417 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1418 ieee80211_sta_rx_queued_ext(sdata, skb); 1419 else 1420 WARN_ON(1); 1421 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1422 struct ieee80211_hdr *hdr = (void *)mgmt; 1423 /* 1424 * So the frame isn't mgmt, but frame_control 1425 * is at the right place anyway, of course, so 1426 * the if statement is correct. 1427 * 1428 * Warn if we have other data frame types here, 1429 * they must not get here. 1430 */ 1431 WARN_ON(hdr->frame_control & 1432 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1433 WARN_ON(!(hdr->seq_ctrl & 1434 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1435 /* 1436 * This was a fragment of a frame, received while 1437 * a block-ack session was active. That cannot be 1438 * right, so terminate the session. 1439 */ 1440 mutex_lock(&local->sta_mtx); 1441 sta = sta_info_get_bss(sdata, mgmt->sa); 1442 if (sta) { 1443 u16 tid = ieee80211_get_tid(hdr); 1444 1445 __ieee80211_stop_rx_ba_session( 1446 sta, tid, WLAN_BACK_RECIPIENT, 1447 WLAN_REASON_QSTA_REQUIRE_SETUP, 1448 true); 1449 } 1450 mutex_unlock(&local->sta_mtx); 1451 } else switch (sdata->vif.type) { 1452 case NL80211_IFTYPE_STATION: 1453 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1454 break; 1455 case NL80211_IFTYPE_ADHOC: 1456 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1457 break; 1458 case NL80211_IFTYPE_MESH_POINT: 1459 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1460 break; 1461 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1462 break; 1463 default: 1464 WARN(1, "frame for unexpected interface type"); 1465 break; 1466 } 1467 1468 kfree_skb(skb); 1469 kcov_remote_stop(); 1470 } 1471 1472 /* then other type-dependent work */ 1473 switch (sdata->vif.type) { 1474 case NL80211_IFTYPE_STATION: 1475 ieee80211_sta_work(sdata); 1476 break; 1477 case NL80211_IFTYPE_ADHOC: 1478 ieee80211_ibss_work(sdata); 1479 break; 1480 case NL80211_IFTYPE_MESH_POINT: 1481 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1482 break; 1483 ieee80211_mesh_work(sdata); 1484 break; 1485 case NL80211_IFTYPE_OCB: 1486 ieee80211_ocb_work(sdata); 1487 break; 1488 default: 1489 break; 1490 } 1491 } 1492 1493 static void ieee80211_recalc_smps_work(struct work_struct *work) 1494 { 1495 struct ieee80211_sub_if_data *sdata = 1496 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1497 1498 ieee80211_recalc_smps(sdata); 1499 } 1500 1501 /* 1502 * Helper function to initialise an interface to a specific type. 1503 */ 1504 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1505 enum nl80211_iftype type) 1506 { 1507 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1508 0xff, 0xff, 0xff}; 1509 1510 /* clear type-dependent union */ 1511 memset(&sdata->u, 0, sizeof(sdata->u)); 1512 1513 /* and set some type-dependent values */ 1514 sdata->vif.type = type; 1515 sdata->vif.p2p = false; 1516 sdata->wdev.iftype = type; 1517 1518 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1519 sdata->control_port_no_encrypt = false; 1520 sdata->control_port_over_nl80211 = false; 1521 sdata->control_port_no_preauth = false; 1522 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1523 sdata->vif.bss_conf.idle = true; 1524 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1525 1526 sdata->noack_map = 0; 1527 1528 /* only monitor/p2p-device differ */ 1529 if (sdata->dev) { 1530 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1531 sdata->dev->type = ARPHRD_ETHER; 1532 } 1533 1534 skb_queue_head_init(&sdata->skb_queue); 1535 INIT_WORK(&sdata->work, ieee80211_iface_work); 1536 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1537 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1538 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1539 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1540 1541 switch (type) { 1542 case NL80211_IFTYPE_P2P_GO: 1543 type = NL80211_IFTYPE_AP; 1544 sdata->vif.type = type; 1545 sdata->vif.p2p = true; 1546 fallthrough; 1547 case NL80211_IFTYPE_AP: 1548 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1549 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1550 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1551 break; 1552 case NL80211_IFTYPE_P2P_CLIENT: 1553 type = NL80211_IFTYPE_STATION; 1554 sdata->vif.type = type; 1555 sdata->vif.p2p = true; 1556 fallthrough; 1557 case NL80211_IFTYPE_STATION: 1558 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1559 ieee80211_sta_setup_sdata(sdata); 1560 break; 1561 case NL80211_IFTYPE_OCB: 1562 sdata->vif.bss_conf.bssid = bssid_wildcard; 1563 ieee80211_ocb_setup_sdata(sdata); 1564 break; 1565 case NL80211_IFTYPE_ADHOC: 1566 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1567 ieee80211_ibss_setup_sdata(sdata); 1568 break; 1569 case NL80211_IFTYPE_MESH_POINT: 1570 if (ieee80211_vif_is_mesh(&sdata->vif)) 1571 ieee80211_mesh_init_sdata(sdata); 1572 break; 1573 case NL80211_IFTYPE_MONITOR: 1574 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1575 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1576 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1577 MONITOR_FLAG_OTHER_BSS; 1578 break; 1579 case NL80211_IFTYPE_WDS: 1580 sdata->vif.bss_conf.bssid = NULL; 1581 break; 1582 case NL80211_IFTYPE_NAN: 1583 idr_init(&sdata->u.nan.function_inst_ids); 1584 spin_lock_init(&sdata->u.nan.func_lock); 1585 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1586 break; 1587 case NL80211_IFTYPE_AP_VLAN: 1588 case NL80211_IFTYPE_P2P_DEVICE: 1589 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1590 break; 1591 case NL80211_IFTYPE_UNSPECIFIED: 1592 case NUM_NL80211_IFTYPES: 1593 WARN_ON(1); 1594 break; 1595 } 1596 1597 ieee80211_debugfs_add_netdev(sdata); 1598 } 1599 1600 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1601 enum nl80211_iftype type) 1602 { 1603 struct ieee80211_local *local = sdata->local; 1604 int ret, err; 1605 enum nl80211_iftype internal_type = type; 1606 bool p2p = false; 1607 1608 ASSERT_RTNL(); 1609 1610 if (!local->ops->change_interface) 1611 return -EBUSY; 1612 1613 switch (sdata->vif.type) { 1614 case NL80211_IFTYPE_AP: 1615 case NL80211_IFTYPE_STATION: 1616 case NL80211_IFTYPE_ADHOC: 1617 case NL80211_IFTYPE_OCB: 1618 /* 1619 * Could maybe also all others here? 1620 * Just not sure how that interacts 1621 * with the RX/config path e.g. for 1622 * mesh. 1623 */ 1624 break; 1625 default: 1626 return -EBUSY; 1627 } 1628 1629 switch (type) { 1630 case NL80211_IFTYPE_AP: 1631 case NL80211_IFTYPE_STATION: 1632 case NL80211_IFTYPE_ADHOC: 1633 case NL80211_IFTYPE_OCB: 1634 /* 1635 * Could probably support everything 1636 * but WDS here (WDS do_open can fail 1637 * under memory pressure, which this 1638 * code isn't prepared to handle). 1639 */ 1640 break; 1641 case NL80211_IFTYPE_P2P_CLIENT: 1642 p2p = true; 1643 internal_type = NL80211_IFTYPE_STATION; 1644 break; 1645 case NL80211_IFTYPE_P2P_GO: 1646 p2p = true; 1647 internal_type = NL80211_IFTYPE_AP; 1648 break; 1649 default: 1650 return -EBUSY; 1651 } 1652 1653 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1654 if (ret) 1655 return ret; 1656 1657 ieee80211_do_stop(sdata, false); 1658 1659 ieee80211_teardown_sdata(sdata); 1660 1661 ieee80211_set_sdata_offload_flags(sdata); 1662 ret = drv_change_interface(local, sdata, internal_type, p2p); 1663 if (ret) 1664 type = ieee80211_vif_type_p2p(&sdata->vif); 1665 1666 /* 1667 * Ignore return value here, there's not much we can do since 1668 * the driver changed the interface type internally already. 1669 * The warnings will hopefully make driver authors fix it :-) 1670 */ 1671 ieee80211_check_queues(sdata, type); 1672 1673 ieee80211_setup_sdata(sdata, type); 1674 ieee80211_set_vif_encap_ops(sdata); 1675 1676 err = ieee80211_do_open(&sdata->wdev, false); 1677 WARN(err, "type change: do_open returned %d", err); 1678 1679 return ret; 1680 } 1681 1682 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1683 enum nl80211_iftype type) 1684 { 1685 int ret; 1686 1687 ASSERT_RTNL(); 1688 1689 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1690 return 0; 1691 1692 if (ieee80211_sdata_running(sdata)) { 1693 ret = ieee80211_runtime_change_iftype(sdata, type); 1694 if (ret) 1695 return ret; 1696 } else { 1697 /* Purge and reset type-dependent state. */ 1698 ieee80211_teardown_sdata(sdata); 1699 ieee80211_setup_sdata(sdata, type); 1700 } 1701 1702 /* reset some values that shouldn't be kept across type changes */ 1703 if (type == NL80211_IFTYPE_STATION) 1704 sdata->u.mgd.use_4addr = false; 1705 1706 return 0; 1707 } 1708 1709 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1710 u8 *perm_addr, enum nl80211_iftype type) 1711 { 1712 struct ieee80211_sub_if_data *sdata; 1713 u64 mask, start, addr, val, inc; 1714 u8 *m; 1715 u8 tmp_addr[ETH_ALEN]; 1716 int i; 1717 1718 /* default ... something at least */ 1719 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1720 1721 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1722 local->hw.wiphy->n_addresses <= 1) 1723 return; 1724 1725 mutex_lock(&local->iflist_mtx); 1726 1727 switch (type) { 1728 case NL80211_IFTYPE_MONITOR: 1729 /* doesn't matter */ 1730 break; 1731 case NL80211_IFTYPE_WDS: 1732 case NL80211_IFTYPE_AP_VLAN: 1733 /* match up with an AP interface */ 1734 list_for_each_entry(sdata, &local->interfaces, list) { 1735 if (sdata->vif.type != NL80211_IFTYPE_AP) 1736 continue; 1737 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1738 break; 1739 } 1740 /* keep default if no AP interface present */ 1741 break; 1742 case NL80211_IFTYPE_P2P_CLIENT: 1743 case NL80211_IFTYPE_P2P_GO: 1744 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1745 list_for_each_entry(sdata, &local->interfaces, list) { 1746 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1747 continue; 1748 if (!ieee80211_sdata_running(sdata)) 1749 continue; 1750 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1751 goto out_unlock; 1752 } 1753 } 1754 fallthrough; 1755 default: 1756 /* assign a new address if possible -- try n_addresses first */ 1757 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1758 bool used = false; 1759 1760 list_for_each_entry(sdata, &local->interfaces, list) { 1761 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1762 sdata->vif.addr)) { 1763 used = true; 1764 break; 1765 } 1766 } 1767 1768 if (!used) { 1769 memcpy(perm_addr, 1770 local->hw.wiphy->addresses[i].addr, 1771 ETH_ALEN); 1772 break; 1773 } 1774 } 1775 1776 /* try mask if available */ 1777 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1778 break; 1779 1780 m = local->hw.wiphy->addr_mask; 1781 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1782 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1783 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1784 1785 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1786 /* not a contiguous mask ... not handled now! */ 1787 pr_info("not contiguous\n"); 1788 break; 1789 } 1790 1791 /* 1792 * Pick address of existing interface in case user changed 1793 * MAC address manually, default to perm_addr. 1794 */ 1795 m = local->hw.wiphy->perm_addr; 1796 list_for_each_entry(sdata, &local->interfaces, list) { 1797 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1798 continue; 1799 m = sdata->vif.addr; 1800 break; 1801 } 1802 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1803 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1804 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1805 1806 inc = 1ULL<<__ffs64(mask); 1807 val = (start & mask); 1808 addr = (start & ~mask) | (val & mask); 1809 do { 1810 bool used = false; 1811 1812 tmp_addr[5] = addr >> 0*8; 1813 tmp_addr[4] = addr >> 1*8; 1814 tmp_addr[3] = addr >> 2*8; 1815 tmp_addr[2] = addr >> 3*8; 1816 tmp_addr[1] = addr >> 4*8; 1817 tmp_addr[0] = addr >> 5*8; 1818 1819 val += inc; 1820 1821 list_for_each_entry(sdata, &local->interfaces, list) { 1822 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1823 used = true; 1824 break; 1825 } 1826 } 1827 1828 if (!used) { 1829 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1830 break; 1831 } 1832 addr = (start & ~mask) | (val & mask); 1833 } while (addr != start); 1834 1835 break; 1836 } 1837 1838 out_unlock: 1839 mutex_unlock(&local->iflist_mtx); 1840 } 1841 1842 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1843 unsigned char name_assign_type, 1844 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1845 struct vif_params *params) 1846 { 1847 struct net_device *ndev = NULL; 1848 struct ieee80211_sub_if_data *sdata = NULL; 1849 struct txq_info *txqi; 1850 void (*if_setup)(struct net_device *dev); 1851 int ret, i; 1852 int txqs = 1; 1853 1854 ASSERT_RTNL(); 1855 1856 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 1857 struct wireless_dev *wdev; 1858 1859 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1860 GFP_KERNEL); 1861 if (!sdata) 1862 return -ENOMEM; 1863 wdev = &sdata->wdev; 1864 1865 sdata->dev = NULL; 1866 strlcpy(sdata->name, name, IFNAMSIZ); 1867 ieee80211_assign_perm_addr(local, wdev->address, type); 1868 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1869 } else { 1870 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 1871 sizeof(void *)); 1872 int txq_size = 0; 1873 1874 if (local->ops->wake_tx_queue && 1875 type != NL80211_IFTYPE_AP_VLAN && 1876 (type != NL80211_IFTYPE_MONITOR || 1877 (params->flags & MONITOR_FLAG_ACTIVE))) 1878 txq_size += sizeof(struct txq_info) + 1879 local->hw.txq_data_size; 1880 1881 if (local->ops->wake_tx_queue) { 1882 if_setup = ieee80211_if_setup_no_queue; 1883 } else { 1884 if_setup = ieee80211_if_setup; 1885 if (local->hw.queues >= IEEE80211_NUM_ACS) 1886 txqs = IEEE80211_NUM_ACS; 1887 } 1888 1889 ndev = alloc_netdev_mqs(size + txq_size, 1890 name, name_assign_type, 1891 if_setup, txqs, 1); 1892 if (!ndev) 1893 return -ENOMEM; 1894 1895 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len) 1896 ndev->tx_queue_len = local->hw.wiphy->tx_queue_len; 1897 1898 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1899 1900 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1901 if (!ndev->tstats) { 1902 free_netdev(ndev); 1903 return -ENOMEM; 1904 } 1905 1906 ndev->needed_headroom = local->tx_headroom + 1907 4*6 /* four MAC addresses */ 1908 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1909 + 6 /* mesh */ 1910 + 8 /* rfc1042/bridge tunnel */ 1911 - ETH_HLEN /* ethernet hard_header_len */ 1912 + IEEE80211_ENCRYPT_HEADROOM; 1913 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1914 1915 ret = dev_alloc_name(ndev, ndev->name); 1916 if (ret < 0) { 1917 ieee80211_if_free(ndev); 1918 free_netdev(ndev); 1919 return ret; 1920 } 1921 1922 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1923 if (is_valid_ether_addr(params->macaddr)) 1924 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN); 1925 else 1926 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1927 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1928 1929 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1930 sdata = netdev_priv(ndev); 1931 ndev->ieee80211_ptr = &sdata->wdev; 1932 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1933 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1934 1935 if (txq_size) { 1936 txqi = netdev_priv(ndev) + size; 1937 ieee80211_txq_init(sdata, NULL, txqi, 0); 1938 } 1939 1940 sdata->dev = ndev; 1941 } 1942 1943 /* initialise type-independent data */ 1944 sdata->wdev.wiphy = local->hw.wiphy; 1945 sdata->local = local; 1946 1947 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1948 skb_queue_head_init(&sdata->fragments[i].skb_list); 1949 1950 INIT_LIST_HEAD(&sdata->key_list); 1951 1952 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1953 ieee80211_dfs_cac_timer_work); 1954 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1955 ieee80211_delayed_tailroom_dec); 1956 1957 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1958 struct ieee80211_supported_band *sband; 1959 sband = local->hw.wiphy->bands[i]; 1960 sdata->rc_rateidx_mask[i] = 1961 sband ? (1 << sband->n_bitrates) - 1 : 0; 1962 if (sband) { 1963 __le16 cap; 1964 u16 *vht_rate_mask; 1965 1966 memcpy(sdata->rc_rateidx_mcs_mask[i], 1967 sband->ht_cap.mcs.rx_mask, 1968 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1969 1970 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 1971 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 1972 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 1973 } else { 1974 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1975 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1976 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 1977 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 1978 } 1979 } 1980 1981 ieee80211_set_default_queues(sdata); 1982 1983 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1984 sdata->user_power_level = local->user_power_level; 1985 1986 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1987 1988 /* setup type-dependent data */ 1989 ieee80211_setup_sdata(sdata, type); 1990 1991 if (ndev) { 1992 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1993 if (type == NL80211_IFTYPE_STATION) 1994 sdata->u.mgd.use_4addr = params->use_4addr; 1995 1996 ndev->features |= local->hw.netdev_features; 1997 ndev->hw_features |= ndev->features & 1998 MAC80211_SUPPORTED_FEATURES_TX; 1999 2000 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2001 2002 /* MTU range: 256 - 2304 */ 2003 ndev->min_mtu = 256; 2004 ndev->max_mtu = local->hw.max_mtu; 2005 2006 ret = register_netdevice(ndev); 2007 if (ret) { 2008 free_netdev(ndev); 2009 return ret; 2010 } 2011 } 2012 2013 mutex_lock(&local->iflist_mtx); 2014 list_add_tail_rcu(&sdata->list, &local->interfaces); 2015 mutex_unlock(&local->iflist_mtx); 2016 2017 if (new_wdev) 2018 *new_wdev = &sdata->wdev; 2019 2020 return 0; 2021 } 2022 2023 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2024 { 2025 ASSERT_RTNL(); 2026 2027 mutex_lock(&sdata->local->iflist_mtx); 2028 list_del_rcu(&sdata->list); 2029 mutex_unlock(&sdata->local->iflist_mtx); 2030 2031 if (sdata->vif.txq) 2032 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2033 2034 synchronize_rcu(); 2035 2036 if (sdata->dev) { 2037 unregister_netdevice(sdata->dev); 2038 } else { 2039 cfg80211_unregister_wdev(&sdata->wdev); 2040 ieee80211_teardown_sdata(sdata); 2041 kfree(sdata); 2042 } 2043 } 2044 2045 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2046 { 2047 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2048 return; 2049 ieee80211_do_stop(sdata, true); 2050 } 2051 2052 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2053 { 2054 struct ieee80211_sub_if_data *sdata, *tmp; 2055 LIST_HEAD(unreg_list); 2056 LIST_HEAD(wdev_list); 2057 2058 ASSERT_RTNL(); 2059 2060 /* Before destroying the interfaces, make sure they're all stopped so 2061 * that the hardware is stopped. Otherwise, the driver might still be 2062 * iterating the interfaces during the shutdown, e.g. from a worker 2063 * or from RX processing or similar, and if it does so (using atomic 2064 * iteration) while we're manipulating the list, the iteration will 2065 * crash. 2066 * 2067 * After this, the hardware should be stopped and the driver should 2068 * have stopped all of its activities, so that we can do RCU-unaware 2069 * manipulations of the interface list below. 2070 */ 2071 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2072 2073 WARN(local->open_count, "%s: open count remains %d\n", 2074 wiphy_name(local->hw.wiphy), local->open_count); 2075 2076 ieee80211_txq_teardown_flows(local); 2077 2078 mutex_lock(&local->iflist_mtx); 2079 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 2080 list_del(&sdata->list); 2081 2082 if (sdata->dev) 2083 unregister_netdevice_queue(sdata->dev, &unreg_list); 2084 else 2085 list_add(&sdata->list, &wdev_list); 2086 } 2087 mutex_unlock(&local->iflist_mtx); 2088 unregister_netdevice_many(&unreg_list); 2089 2090 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 2091 list_del(&sdata->list); 2092 cfg80211_unregister_wdev(&sdata->wdev); 2093 kfree(sdata); 2094 } 2095 } 2096 2097 static int netdev_notify(struct notifier_block *nb, 2098 unsigned long state, void *ptr) 2099 { 2100 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2101 struct ieee80211_sub_if_data *sdata; 2102 2103 if (state != NETDEV_CHANGENAME) 2104 return NOTIFY_DONE; 2105 2106 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2107 return NOTIFY_DONE; 2108 2109 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2110 return NOTIFY_DONE; 2111 2112 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2113 memcpy(sdata->name, dev->name, IFNAMSIZ); 2114 ieee80211_debugfs_rename_netdev(sdata); 2115 2116 return NOTIFY_OK; 2117 } 2118 2119 static struct notifier_block mac80211_netdev_notifier = { 2120 .notifier_call = netdev_notify, 2121 }; 2122 2123 int ieee80211_iface_init(void) 2124 { 2125 return register_netdevice_notifier(&mac80211_netdev_notifier); 2126 } 2127 2128 void ieee80211_iface_exit(void) 2129 { 2130 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2131 } 2132 2133 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2134 { 2135 if (sdata->vif.type == NL80211_IFTYPE_AP) 2136 atomic_inc(&sdata->u.ap.num_mcast_sta); 2137 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2138 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2139 } 2140 2141 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2142 { 2143 if (sdata->vif.type == NL80211_IFTYPE_AP) 2144 atomic_dec(&sdata->u.ap.num_mcast_sta); 2145 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2146 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2147 } 2148