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) 2018-2022 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 __ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)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.bss_conf.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->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL) 64 power = min(power, sdata->deflink.user_power_level); 65 66 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 67 power = min(power, sdata->deflink.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 ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)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_link_info_change_notify(sdata, &sdata->deflink, 84 BSS_CHANGED_TXPOWER); 85 } 86 __ieee80211_idle_off(struct ieee80211_local * local)87 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 88 { 89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 90 return 0; 91 92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 93 return IEEE80211_CONF_CHANGE_IDLE; 94 } 95 __ieee80211_idle_on(struct ieee80211_local * local)96 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 97 { 98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 99 return 0; 100 101 ieee80211_flush_queues(local, NULL, false); 102 103 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 104 return IEEE80211_CONF_CHANGE_IDLE; 105 } 106 __ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 108 bool force_active) 109 { 110 bool working, scanning, active; 111 unsigned int led_trig_start = 0, led_trig_stop = 0; 112 113 lockdep_assert_held(&local->mtx); 114 115 active = force_active || 116 !list_empty(&local->chanctx_list) || 117 local->monitors; 118 119 working = !local->ops->remain_on_channel && 120 !list_empty(&local->roc_list); 121 122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 124 125 if (working || scanning) 126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 127 else 128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 129 130 if (active) 131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 132 else 133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 134 135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 136 137 if (working || scanning || active) 138 return __ieee80211_idle_off(local); 139 return __ieee80211_idle_on(local); 140 } 141 ieee80211_idle_off(struct ieee80211_local * local)142 u32 ieee80211_idle_off(struct ieee80211_local *local) 143 { 144 return __ieee80211_recalc_idle(local, true); 145 } 146 ieee80211_recalc_idle(struct ieee80211_local * local)147 void ieee80211_recalc_idle(struct ieee80211_local *local) 148 { 149 u32 change = __ieee80211_recalc_idle(local, false); 150 if (change) 151 ieee80211_hw_config(local, change); 152 } 153 ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 155 bool check_dup) 156 { 157 struct ieee80211_local *local = sdata->local; 158 struct ieee80211_sub_if_data *iter; 159 u64 new, mask, tmp; 160 u8 *m; 161 int ret = 0; 162 163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 164 return 0; 165 166 m = addr; 167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 170 171 m = local->hw.wiphy->addr_mask; 172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 175 176 if (!check_dup) 177 return ret; 178 179 mutex_lock(&local->iflist_mtx); 180 list_for_each_entry(iter, &local->interfaces, list) { 181 if (iter == sdata) 182 continue; 183 184 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 186 continue; 187 188 m = iter->vif.addr; 189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 192 193 if ((new & ~mask) != (tmp & ~mask)) { 194 ret = -EINVAL; 195 break; 196 } 197 } 198 mutex_unlock(&local->iflist_mtx); 199 200 return ret; 201 } 202 ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data * sdata)203 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 204 { 205 struct ieee80211_roc_work *roc; 206 struct ieee80211_local *local = sdata->local; 207 struct ieee80211_sub_if_data *scan_sdata; 208 int ret = 0; 209 210 /* To be the most flexible here we want to only limit changing the 211 * address if the specific interface is doing offchannel work or 212 * scanning. 213 */ 214 if (netif_carrier_ok(sdata->dev)) 215 return -EBUSY; 216 217 mutex_lock(&local->mtx); 218 219 /* First check no ROC work is happening on this iface */ 220 list_for_each_entry(roc, &local->roc_list, list) { 221 if (roc->sdata != sdata) 222 continue; 223 224 if (roc->started) { 225 ret = -EBUSY; 226 goto unlock; 227 } 228 } 229 230 /* And if this iface is scanning */ 231 if (local->scanning) { 232 scan_sdata = rcu_dereference_protected(local->scan_sdata, 233 lockdep_is_held(&local->mtx)); 234 if (sdata == scan_sdata) 235 ret = -EBUSY; 236 } 237 238 switch (sdata->vif.type) { 239 case NL80211_IFTYPE_STATION: 240 case NL80211_IFTYPE_P2P_CLIENT: 241 /* More interface types could be added here but changing the 242 * address while powered makes the most sense in client modes. 243 */ 244 break; 245 default: 246 ret = -EOPNOTSUPP; 247 } 248 249 unlock: 250 mutex_unlock(&local->mtx); 251 return ret; 252 } 253 ieee80211_change_mac(struct net_device * dev,void * addr)254 static int ieee80211_change_mac(struct net_device *dev, void *addr) 255 { 256 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 257 struct ieee80211_local *local = sdata->local; 258 struct sockaddr *sa = addr; 259 bool check_dup = true; 260 bool live = false; 261 int ret; 262 263 if (ieee80211_sdata_running(sdata)) { 264 ret = ieee80211_can_powered_addr_change(sdata); 265 if (ret) 266 return ret; 267 268 live = true; 269 } 270 271 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 272 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 273 check_dup = false; 274 275 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 276 if (ret) 277 return ret; 278 279 if (live) 280 drv_remove_interface(local, sdata); 281 ret = eth_mac_addr(dev, sa); 282 283 if (ret == 0) { 284 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 285 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 286 } 287 288 /* Regardless of eth_mac_addr() return we still want to add the 289 * interface back. This should not fail... 290 */ 291 if (live) 292 WARN_ON(drv_add_interface(local, sdata)); 293 294 return ret; 295 } 296 identical_mac_addr_allowed(int type1,int type2)297 static inline int identical_mac_addr_allowed(int type1, int type2) 298 { 299 return type1 == NL80211_IFTYPE_MONITOR || 300 type2 == NL80211_IFTYPE_MONITOR || 301 type1 == NL80211_IFTYPE_P2P_DEVICE || 302 type2 == NL80211_IFTYPE_P2P_DEVICE || 303 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 304 (type1 == NL80211_IFTYPE_AP_VLAN && 305 (type2 == NL80211_IFTYPE_AP || 306 type2 == NL80211_IFTYPE_AP_VLAN)); 307 } 308 ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)309 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 310 enum nl80211_iftype iftype) 311 { 312 struct ieee80211_local *local = sdata->local; 313 struct ieee80211_sub_if_data *nsdata; 314 int ret; 315 316 ASSERT_RTNL(); 317 318 /* we hold the RTNL here so can safely walk the list */ 319 list_for_each_entry(nsdata, &local->interfaces, list) { 320 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 321 /* 322 * Only OCB and monitor mode may coexist 323 */ 324 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 325 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 326 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 327 nsdata->vif.type == NL80211_IFTYPE_OCB)) 328 return -EBUSY; 329 330 /* 331 * Allow only a single IBSS interface to be up at any 332 * time. This is restricted because beacon distribution 333 * cannot work properly if both are in the same IBSS. 334 * 335 * To remove this restriction we'd have to disallow them 336 * from setting the same SSID on different IBSS interfaces 337 * belonging to the same hardware. Then, however, we're 338 * faced with having to adopt two different TSF timers... 339 */ 340 if (iftype == NL80211_IFTYPE_ADHOC && 341 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 342 return -EBUSY; 343 /* 344 * will not add another interface while any channel 345 * switch is active. 346 */ 347 if (nsdata->vif.bss_conf.csa_active) 348 return -EBUSY; 349 350 /* 351 * The remaining checks are only performed for interfaces 352 * with the same MAC address. 353 */ 354 if (!ether_addr_equal(sdata->vif.addr, 355 nsdata->vif.addr)) 356 continue; 357 358 /* 359 * check whether it may have the same address 360 */ 361 if (!identical_mac_addr_allowed(iftype, 362 nsdata->vif.type)) 363 return -ENOTUNIQ; 364 365 /* No support for VLAN with MLO yet */ 366 if (iftype == NL80211_IFTYPE_AP_VLAN && 367 sdata->wdev.use_4addr && 368 nsdata->vif.type == NL80211_IFTYPE_AP && 369 nsdata->vif.valid_links) 370 return -EOPNOTSUPP; 371 372 /* 373 * can only add VLANs to enabled APs 374 */ 375 if (iftype == NL80211_IFTYPE_AP_VLAN && 376 nsdata->vif.type == NL80211_IFTYPE_AP) 377 sdata->bss = &nsdata->u.ap; 378 } 379 } 380 381 mutex_lock(&local->chanctx_mtx); 382 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 383 mutex_unlock(&local->chanctx_mtx); 384 return ret; 385 } 386 ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)387 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 388 enum nl80211_iftype iftype) 389 { 390 int n_queues = sdata->local->hw.queues; 391 int i; 392 393 if (iftype == NL80211_IFTYPE_NAN) 394 return 0; 395 396 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 397 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 398 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 399 IEEE80211_INVAL_HW_QUEUE)) 400 return -EINVAL; 401 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 402 n_queues)) 403 return -EINVAL; 404 } 405 } 406 407 if ((iftype != NL80211_IFTYPE_AP && 408 iftype != NL80211_IFTYPE_P2P_GO && 409 iftype != NL80211_IFTYPE_MESH_POINT) || 410 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 411 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 412 return 0; 413 } 414 415 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 416 return -EINVAL; 417 418 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 419 return -EINVAL; 420 421 return 0; 422 } 423 ieee80211_open(struct net_device * dev)424 static int ieee80211_open(struct net_device *dev) 425 { 426 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 427 int err; 428 429 /* fail early if user set an invalid address */ 430 if (!is_valid_ether_addr(dev->dev_addr)) 431 return -EADDRNOTAVAIL; 432 433 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 434 if (err) 435 return err; 436 437 wiphy_lock(sdata->local->hw.wiphy); 438 err = ieee80211_do_open(&sdata->wdev, true); 439 wiphy_unlock(sdata->local->hw.wiphy); 440 441 return err; 442 } 443 ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)444 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 445 { 446 struct ieee80211_local *local = sdata->local; 447 unsigned long flags; 448 struct sk_buff *skb, *tmp; 449 u32 hw_reconf_flags = 0; 450 int i, flushed; 451 struct ps_data *ps; 452 struct cfg80211_chan_def chandef; 453 bool cancel_scan; 454 struct cfg80211_nan_func *func; 455 456 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 457 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 458 459 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 460 if (cancel_scan) 461 ieee80211_scan_cancel(local); 462 463 ieee80211_roc_purge(local, sdata); 464 465 switch (sdata->vif.type) { 466 case NL80211_IFTYPE_STATION: 467 ieee80211_mgd_stop(sdata); 468 break; 469 case NL80211_IFTYPE_ADHOC: 470 ieee80211_ibss_stop(sdata); 471 break; 472 case NL80211_IFTYPE_MONITOR: 473 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 474 break; 475 list_del_rcu(&sdata->u.mntr.list); 476 break; 477 default: 478 break; 479 } 480 481 /* 482 * Remove all stations associated with this interface. 483 * 484 * This must be done before calling ops->remove_interface() 485 * because otherwise we can later invoke ops->sta_notify() 486 * whenever the STAs are removed, and that invalidates driver 487 * assumptions about always getting a vif pointer that is valid 488 * (because if we remove a STA after ops->remove_interface() 489 * the driver will have removed the vif info already!) 490 * 491 * For AP_VLANs stations may exist since there's nothing else that 492 * would have removed them, but in other modes there shouldn't 493 * be any stations. 494 */ 495 flushed = sta_info_flush(sdata); 496 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 497 498 /* don't count this interface for allmulti while it is down */ 499 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 500 atomic_dec(&local->iff_allmultis); 501 502 if (sdata->vif.type == NL80211_IFTYPE_AP) { 503 local->fif_pspoll--; 504 local->fif_probe_req--; 505 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 506 local->fif_probe_req--; 507 } 508 509 if (sdata->dev) { 510 netif_addr_lock_bh(sdata->dev); 511 spin_lock_bh(&local->filter_lock); 512 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 513 sdata->dev->addr_len); 514 spin_unlock_bh(&local->filter_lock); 515 netif_addr_unlock_bh(sdata->dev); 516 } 517 518 del_timer_sync(&local->dynamic_ps_timer); 519 cancel_work_sync(&local->dynamic_ps_enable_work); 520 521 cancel_work_sync(&sdata->recalc_smps); 522 523 sdata_lock(sdata); 524 WARN(sdata->vif.valid_links, 525 "destroying interface with valid links 0x%04x\n", 526 sdata->vif.valid_links); 527 528 mutex_lock(&local->mtx); 529 sdata->vif.bss_conf.csa_active = false; 530 if (sdata->vif.type == NL80211_IFTYPE_STATION) 531 sdata->deflink.u.mgd.csa_waiting_bcn = false; 532 if (sdata->deflink.csa_block_tx) { 533 ieee80211_wake_vif_queues(local, sdata, 534 IEEE80211_QUEUE_STOP_REASON_CSA); 535 sdata->deflink.csa_block_tx = false; 536 } 537 mutex_unlock(&local->mtx); 538 sdata_unlock(sdata); 539 540 cancel_work_sync(&sdata->deflink.csa_finalize_work); 541 cancel_work_sync(&sdata->deflink.color_change_finalize_work); 542 543 cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work); 544 545 if (sdata->wdev.cac_started) { 546 chandef = sdata->vif.bss_conf.chandef; 547 WARN_ON(local->suspended); 548 mutex_lock(&local->mtx); 549 ieee80211_link_release_channel(&sdata->deflink); 550 mutex_unlock(&local->mtx); 551 cfg80211_cac_event(sdata->dev, &chandef, 552 NL80211_RADAR_CAC_ABORTED, 553 GFP_KERNEL); 554 } 555 556 if (sdata->vif.type == NL80211_IFTYPE_AP) { 557 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 558 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 559 /* remove all packets in parent bc_buf pointing to this dev */ 560 ps = &sdata->bss->ps; 561 562 spin_lock_irqsave(&ps->bc_buf.lock, flags); 563 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 564 if (skb->dev == sdata->dev) { 565 __skb_unlink(skb, &ps->bc_buf); 566 local->total_ps_buffered--; 567 ieee80211_free_txskb(&local->hw, skb); 568 } 569 } 570 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 571 } 572 573 if (going_down) 574 local->open_count--; 575 576 switch (sdata->vif.type) { 577 case NL80211_IFTYPE_AP_VLAN: 578 mutex_lock(&local->mtx); 579 list_del(&sdata->u.vlan.list); 580 mutex_unlock(&local->mtx); 581 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 582 /* see comment in the default case below */ 583 ieee80211_free_keys(sdata, true); 584 /* no need to tell driver */ 585 break; 586 case NL80211_IFTYPE_MONITOR: 587 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 588 local->cooked_mntrs--; 589 break; 590 } 591 592 local->monitors--; 593 if (local->monitors == 0) { 594 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 595 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 596 } 597 598 ieee80211_adjust_monitor_flags(sdata, -1); 599 break; 600 case NL80211_IFTYPE_NAN: 601 /* clean all the functions */ 602 spin_lock_bh(&sdata->u.nan.func_lock); 603 604 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 605 idr_remove(&sdata->u.nan.function_inst_ids, i); 606 cfg80211_free_nan_func(func); 607 } 608 idr_destroy(&sdata->u.nan.function_inst_ids); 609 610 spin_unlock_bh(&sdata->u.nan.func_lock); 611 break; 612 case NL80211_IFTYPE_P2P_DEVICE: 613 /* relies on synchronize_rcu() below */ 614 RCU_INIT_POINTER(local->p2p_sdata, NULL); 615 fallthrough; 616 default: 617 cancel_work_sync(&sdata->work); 618 /* 619 * When we get here, the interface is marked down. 620 * Free the remaining keys, if there are any 621 * (which can happen in AP mode if userspace sets 622 * keys before the interface is operating) 623 * 624 * Force the key freeing to always synchronize_net() 625 * to wait for the RX path in case it is using this 626 * interface enqueuing frames at this very time on 627 * another CPU. 628 */ 629 ieee80211_free_keys(sdata, true); 630 skb_queue_purge(&sdata->skb_queue); 631 skb_queue_purge(&sdata->status_queue); 632 } 633 634 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 635 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 636 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 637 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 638 if (info->control.vif == &sdata->vif) { 639 __skb_unlink(skb, &local->pending[i]); 640 ieee80211_free_txskb(&local->hw, skb); 641 } 642 } 643 } 644 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 645 646 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 647 ieee80211_txq_remove_vlan(local, sdata); 648 649 sdata->bss = NULL; 650 651 if (local->open_count == 0) 652 ieee80211_clear_tx_pending(local); 653 654 sdata->vif.bss_conf.beacon_int = 0; 655 656 /* 657 * If the interface goes down while suspended, presumably because 658 * the device was unplugged and that happens before our resume, 659 * then the driver is already unconfigured and the remainder of 660 * this function isn't needed. 661 * XXX: what about WoWLAN? If the device has software state, e.g. 662 * memory allocated, it might expect teardown commands from 663 * mac80211 here? 664 */ 665 if (local->suspended) { 666 WARN_ON(local->wowlan); 667 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 668 return; 669 } 670 671 switch (sdata->vif.type) { 672 case NL80211_IFTYPE_AP_VLAN: 673 break; 674 case NL80211_IFTYPE_MONITOR: 675 if (local->monitors == 0) 676 ieee80211_del_virtual_monitor(local); 677 678 mutex_lock(&local->mtx); 679 ieee80211_recalc_idle(local); 680 mutex_unlock(&local->mtx); 681 682 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 683 break; 684 685 fallthrough; 686 default: 687 if (going_down) 688 drv_remove_interface(local, sdata); 689 } 690 691 ieee80211_recalc_ps(local); 692 693 if (cancel_scan) 694 flush_delayed_work(&local->scan_work); 695 696 if (local->open_count == 0) { 697 ieee80211_stop_device(local); 698 699 /* no reconfiguring after stop! */ 700 return; 701 } 702 703 /* do after stop to avoid reconfiguring when we stop anyway */ 704 ieee80211_configure_filter(local); 705 ieee80211_hw_config(local, hw_reconf_flags); 706 707 if (local->monitors == local->open_count) 708 ieee80211_add_virtual_monitor(local); 709 } 710 ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)711 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 712 { 713 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 714 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 715 716 if (!tx_vif) 717 return; 718 719 tx_sdata = vif_to_sdata(tx_vif); 720 sdata->vif.mbssid_tx_vif = NULL; 721 722 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 723 &tx_sdata->local->interfaces, list) { 724 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 725 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 726 ieee80211_sdata_running(non_tx_sdata)) { 727 non_tx_sdata->vif.mbssid_tx_vif = NULL; 728 dev_close(non_tx_sdata->wdev.netdev); 729 } 730 } 731 732 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 733 tx_sdata->vif.mbssid_tx_vif = NULL; 734 dev_close(tx_sdata->wdev.netdev); 735 } 736 } 737 ieee80211_stop(struct net_device * dev)738 static int ieee80211_stop(struct net_device *dev) 739 { 740 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 741 742 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 743 if (sdata->vif.type == NL80211_IFTYPE_AP) { 744 struct ieee80211_sub_if_data *vlan, *tmpsdata; 745 746 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 747 u.vlan.list) 748 dev_close(vlan->dev); 749 750 ieee80211_stop_mbssid(sdata); 751 } 752 753 cancel_work_sync(&sdata->activate_links_work); 754 755 wiphy_lock(sdata->local->hw.wiphy); 756 ieee80211_do_stop(sdata, true); 757 wiphy_unlock(sdata->local->hw.wiphy); 758 759 return 0; 760 } 761 ieee80211_set_multicast_list(struct net_device * dev)762 static void ieee80211_set_multicast_list(struct net_device *dev) 763 { 764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 765 struct ieee80211_local *local = sdata->local; 766 int allmulti, sdata_allmulti; 767 768 allmulti = !!(dev->flags & IFF_ALLMULTI); 769 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 770 771 if (allmulti != sdata_allmulti) { 772 if (dev->flags & IFF_ALLMULTI) 773 atomic_inc(&local->iff_allmultis); 774 else 775 atomic_dec(&local->iff_allmultis); 776 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 777 } 778 779 spin_lock_bh(&local->filter_lock); 780 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 781 spin_unlock_bh(&local->filter_lock); 782 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 783 } 784 785 /* 786 * Called when the netdev is removed or, by the code below, before 787 * the interface type changes. 788 */ ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)789 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 790 { 791 /* free extra data */ 792 ieee80211_free_keys(sdata, false); 793 794 ieee80211_debugfs_remove_netdev(sdata); 795 796 ieee80211_destroy_frag_cache(&sdata->frags); 797 798 if (ieee80211_vif_is_mesh(&sdata->vif)) 799 ieee80211_mesh_teardown_sdata(sdata); 800 801 ieee80211_vif_clear_links(sdata); 802 ieee80211_link_stop(&sdata->deflink); 803 } 804 ieee80211_uninit(struct net_device * dev)805 static void ieee80211_uninit(struct net_device *dev) 806 { 807 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 808 } 809 810 static void ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)811 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 812 { 813 dev_fetch_sw_netstats(stats, dev->tstats); 814 } 815 816 static const struct net_device_ops ieee80211_dataif_ops = { 817 .ndo_open = ieee80211_open, 818 .ndo_stop = ieee80211_stop, 819 .ndo_uninit = ieee80211_uninit, 820 .ndo_start_xmit = ieee80211_subif_start_xmit, 821 .ndo_set_rx_mode = ieee80211_set_multicast_list, 822 .ndo_set_mac_address = ieee80211_change_mac, 823 .ndo_get_stats64 = ieee80211_get_stats64, 824 }; 825 ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)826 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 827 struct sk_buff *skb, 828 struct net_device *sb_dev) 829 { 830 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 831 struct ieee80211_local *local = sdata->local; 832 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 833 struct ieee80211_hdr *hdr; 834 int len_rthdr; 835 836 if (local->hw.queues < IEEE80211_NUM_ACS) 837 return 0; 838 839 /* reset flags and info before parsing radiotap header */ 840 memset(info, 0, sizeof(*info)); 841 842 if (!ieee80211_parse_tx_radiotap(skb, dev)) 843 return 0; /* doesn't matter, frame will be dropped */ 844 845 len_rthdr = ieee80211_get_radiotap_len(skb->data); 846 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 847 if (skb->len < len_rthdr + 2 || 848 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 849 return 0; /* doesn't matter, frame will be dropped */ 850 851 return ieee80211_select_queue_80211(sdata, skb, hdr); 852 } 853 854 static const struct net_device_ops ieee80211_monitorif_ops = { 855 .ndo_open = ieee80211_open, 856 .ndo_stop = ieee80211_stop, 857 .ndo_uninit = ieee80211_uninit, 858 .ndo_start_xmit = ieee80211_monitor_start_xmit, 859 .ndo_set_rx_mode = ieee80211_set_multicast_list, 860 .ndo_set_mac_address = ieee80211_change_mac, 861 .ndo_select_queue = ieee80211_monitor_select_queue, 862 .ndo_get_stats64 = ieee80211_get_stats64, 863 }; 864 ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)865 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 866 struct net_device_path *path) 867 { 868 struct ieee80211_sub_if_data *sdata; 869 struct ieee80211_local *local; 870 struct sta_info *sta; 871 int ret = -ENOENT; 872 873 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 874 local = sdata->local; 875 876 if (!local->ops->net_fill_forward_path) 877 return -EOPNOTSUPP; 878 879 rcu_read_lock(); 880 switch (sdata->vif.type) { 881 case NL80211_IFTYPE_AP_VLAN: 882 sta = rcu_dereference(sdata->u.vlan.sta); 883 if (sta) 884 break; 885 if (sdata->wdev.use_4addr) 886 goto out; 887 if (is_multicast_ether_addr(ctx->daddr)) 888 goto out; 889 sta = sta_info_get_bss(sdata, ctx->daddr); 890 break; 891 case NL80211_IFTYPE_AP: 892 if (is_multicast_ether_addr(ctx->daddr)) 893 goto out; 894 sta = sta_info_get(sdata, ctx->daddr); 895 break; 896 case NL80211_IFTYPE_STATION: 897 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 898 sta = sta_info_get(sdata, ctx->daddr); 899 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 900 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 901 goto out; 902 903 break; 904 } 905 } 906 907 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 908 break; 909 default: 910 goto out; 911 } 912 913 if (!sta) 914 goto out; 915 916 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 917 out: 918 rcu_read_unlock(); 919 920 return ret; 921 } 922 923 static const struct net_device_ops ieee80211_dataif_8023_ops = { 924 .ndo_open = ieee80211_open, 925 .ndo_stop = ieee80211_stop, 926 .ndo_uninit = ieee80211_uninit, 927 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 928 .ndo_set_rx_mode = ieee80211_set_multicast_list, 929 .ndo_set_mac_address = ieee80211_change_mac, 930 .ndo_get_stats64 = ieee80211_get_stats64, 931 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 932 }; 933 ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)934 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 935 { 936 switch (iftype) { 937 /* P2P GO and client are mapped to AP/STATION types */ 938 case NL80211_IFTYPE_AP: 939 case NL80211_IFTYPE_STATION: 940 return true; 941 default: 942 return false; 943 } 944 } 945 ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)946 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 947 { 948 struct ieee80211_local *local = sdata->local; 949 u32 flags; 950 951 flags = sdata->vif.offload_flags; 952 953 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 954 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 955 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 956 957 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 958 local->hw.wiphy->frag_threshold != (u32)-1) 959 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 960 961 if (local->monitors) 962 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 963 } else { 964 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 965 } 966 967 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 968 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 969 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 970 971 if (local->monitors && 972 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 973 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 974 } else { 975 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 976 } 977 978 if (sdata->vif.offload_flags == flags) 979 return false; 980 981 sdata->vif.offload_flags = flags; 982 ieee80211_check_fast_rx_iface(sdata); 983 return true; 984 } 985 ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)986 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 987 { 988 struct ieee80211_local *local = sdata->local; 989 struct ieee80211_sub_if_data *bss = sdata; 990 bool enabled; 991 992 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 993 if (!sdata->bss) 994 return; 995 996 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 997 } 998 999 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1000 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1001 return; 1002 1003 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1004 if (sdata->wdev.use_4addr && 1005 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1006 enabled = false; 1007 1008 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1009 &ieee80211_dataif_ops; 1010 } 1011 ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)1012 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1013 { 1014 struct ieee80211_local *local = sdata->local; 1015 struct ieee80211_sub_if_data *vsdata; 1016 1017 if (ieee80211_set_sdata_offload_flags(sdata)) { 1018 drv_update_vif_offload(local, sdata); 1019 ieee80211_set_vif_encap_ops(sdata); 1020 } 1021 1022 list_for_each_entry(vsdata, &local->interfaces, list) { 1023 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1024 vsdata->bss != &sdata->u.ap) 1025 continue; 1026 1027 ieee80211_set_vif_encap_ops(vsdata); 1028 } 1029 } 1030 ieee80211_recalc_offload(struct ieee80211_local * local)1031 void ieee80211_recalc_offload(struct ieee80211_local *local) 1032 { 1033 struct ieee80211_sub_if_data *sdata; 1034 1035 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1036 return; 1037 1038 mutex_lock(&local->iflist_mtx); 1039 1040 list_for_each_entry(sdata, &local->interfaces, list) { 1041 if (!ieee80211_sdata_running(sdata)) 1042 continue; 1043 1044 ieee80211_recalc_sdata_offload(sdata); 1045 } 1046 1047 mutex_unlock(&local->iflist_mtx); 1048 } 1049 ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1050 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1051 const int offset) 1052 { 1053 struct ieee80211_local *local = sdata->local; 1054 u32 flags = sdata->u.mntr.flags; 1055 1056 #define ADJUST(_f, _s) do { \ 1057 if (flags & MONITOR_FLAG_##_f) \ 1058 local->fif_##_s += offset; \ 1059 } while (0) 1060 1061 ADJUST(FCSFAIL, fcsfail); 1062 ADJUST(PLCPFAIL, plcpfail); 1063 ADJUST(CONTROL, control); 1064 ADJUST(CONTROL, pspoll); 1065 ADJUST(OTHER_BSS, other_bss); 1066 1067 #undef ADJUST 1068 } 1069 ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1070 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1071 { 1072 struct ieee80211_local *local = sdata->local; 1073 int i; 1074 1075 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1076 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1077 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1078 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1079 sdata->vif.hw_queue[i] = i; 1080 else 1081 sdata->vif.hw_queue[i] = 0; 1082 } 1083 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1084 } 1085 ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1086 static void ieee80211_sdata_init(struct ieee80211_local *local, 1087 struct ieee80211_sub_if_data *sdata) 1088 { 1089 sdata->local = local; 1090 1091 /* 1092 * Initialize the default link, so we can use link_id 0 for non-MLD, 1093 * and that continues to work for non-MLD-aware drivers that use just 1094 * vif.bss_conf instead of vif.link_conf. 1095 * 1096 * Note that we never change this, so if link ID 0 isn't used in an 1097 * MLD connection, we get a separate allocation for it. 1098 */ 1099 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1100 } 1101 ieee80211_add_virtual_monitor(struct ieee80211_local * local)1102 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1103 { 1104 struct ieee80211_sub_if_data *sdata; 1105 int ret; 1106 1107 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1108 return 0; 1109 1110 ASSERT_RTNL(); 1111 lockdep_assert_wiphy(local->hw.wiphy); 1112 1113 if (local->monitor_sdata) 1114 return 0; 1115 1116 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1117 if (!sdata) 1118 return -ENOMEM; 1119 1120 /* set up data */ 1121 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1122 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1123 wiphy_name(local->hw.wiphy)); 1124 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1125 1126 ieee80211_sdata_init(local, sdata); 1127 1128 ieee80211_set_default_queues(sdata); 1129 1130 ret = drv_add_interface(local, sdata); 1131 if (WARN_ON(ret)) { 1132 /* ok .. stupid driver, it asked for this! */ 1133 kfree(sdata); 1134 return ret; 1135 } 1136 1137 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1138 1139 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1140 if (ret) { 1141 kfree(sdata); 1142 return ret; 1143 } 1144 1145 mutex_lock(&local->iflist_mtx); 1146 rcu_assign_pointer(local->monitor_sdata, sdata); 1147 mutex_unlock(&local->iflist_mtx); 1148 1149 mutex_lock(&local->mtx); 1150 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef, 1151 IEEE80211_CHANCTX_EXCLUSIVE); 1152 mutex_unlock(&local->mtx); 1153 if (ret) { 1154 mutex_lock(&local->iflist_mtx); 1155 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1156 mutex_unlock(&local->iflist_mtx); 1157 synchronize_net(); 1158 drv_remove_interface(local, sdata); 1159 kfree(sdata); 1160 return ret; 1161 } 1162 1163 skb_queue_head_init(&sdata->skb_queue); 1164 skb_queue_head_init(&sdata->status_queue); 1165 INIT_WORK(&sdata->work, ieee80211_iface_work); 1166 1167 return 0; 1168 } 1169 ieee80211_del_virtual_monitor(struct ieee80211_local * local)1170 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1171 { 1172 struct ieee80211_sub_if_data *sdata; 1173 1174 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1175 return; 1176 1177 ASSERT_RTNL(); 1178 lockdep_assert_wiphy(local->hw.wiphy); 1179 1180 mutex_lock(&local->iflist_mtx); 1181 1182 sdata = rcu_dereference_protected(local->monitor_sdata, 1183 lockdep_is_held(&local->iflist_mtx)); 1184 if (!sdata) { 1185 mutex_unlock(&local->iflist_mtx); 1186 return; 1187 } 1188 1189 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1190 mutex_unlock(&local->iflist_mtx); 1191 1192 synchronize_net(); 1193 1194 mutex_lock(&local->mtx); 1195 ieee80211_link_release_channel(&sdata->deflink); 1196 mutex_unlock(&local->mtx); 1197 1198 drv_remove_interface(local, sdata); 1199 1200 kfree(sdata); 1201 } 1202 1203 /* 1204 * NOTE: Be very careful when changing this function, it must NOT return 1205 * an error on interface type changes that have been pre-checked, so most 1206 * checks should be in ieee80211_check_concurrent_iface. 1207 */ ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1208 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1209 { 1210 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1211 struct net_device *dev = wdev->netdev; 1212 struct ieee80211_local *local = sdata->local; 1213 u32 changed = 0; 1214 int res; 1215 u32 hw_reconf_flags = 0; 1216 1217 switch (sdata->vif.type) { 1218 case NL80211_IFTYPE_AP_VLAN: { 1219 struct ieee80211_sub_if_data *master; 1220 1221 if (!sdata->bss) 1222 return -ENOLINK; 1223 1224 mutex_lock(&local->mtx); 1225 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1226 mutex_unlock(&local->mtx); 1227 1228 master = container_of(sdata->bss, 1229 struct ieee80211_sub_if_data, u.ap); 1230 sdata->control_port_protocol = 1231 master->control_port_protocol; 1232 sdata->control_port_no_encrypt = 1233 master->control_port_no_encrypt; 1234 sdata->control_port_over_nl80211 = 1235 master->control_port_over_nl80211; 1236 sdata->control_port_no_preauth = 1237 master->control_port_no_preauth; 1238 sdata->vif.cab_queue = master->vif.cab_queue; 1239 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1240 sizeof(sdata->vif.hw_queue)); 1241 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 1242 1243 mutex_lock(&local->key_mtx); 1244 sdata->crypto_tx_tailroom_needed_cnt += 1245 master->crypto_tx_tailroom_needed_cnt; 1246 mutex_unlock(&local->key_mtx); 1247 1248 break; 1249 } 1250 case NL80211_IFTYPE_AP: 1251 sdata->bss = &sdata->u.ap; 1252 break; 1253 case NL80211_IFTYPE_MESH_POINT: 1254 case NL80211_IFTYPE_STATION: 1255 case NL80211_IFTYPE_MONITOR: 1256 case NL80211_IFTYPE_ADHOC: 1257 case NL80211_IFTYPE_P2P_DEVICE: 1258 case NL80211_IFTYPE_OCB: 1259 case NL80211_IFTYPE_NAN: 1260 /* no special treatment */ 1261 break; 1262 case NL80211_IFTYPE_UNSPECIFIED: 1263 case NUM_NL80211_IFTYPES: 1264 case NL80211_IFTYPE_P2P_CLIENT: 1265 case NL80211_IFTYPE_P2P_GO: 1266 case NL80211_IFTYPE_WDS: 1267 /* cannot happen */ 1268 WARN_ON(1); 1269 break; 1270 } 1271 1272 if (local->open_count == 0) { 1273 res = drv_start(local); 1274 if (res) 1275 goto err_del_bss; 1276 /* we're brought up, everything changes */ 1277 hw_reconf_flags = ~0; 1278 ieee80211_led_radio(local, true); 1279 ieee80211_mod_tpt_led_trig(local, 1280 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1281 } 1282 1283 /* 1284 * Copy the hopefully now-present MAC address to 1285 * this interface, if it has the special null one. 1286 */ 1287 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1288 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1289 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1290 1291 if (!is_valid_ether_addr(dev->dev_addr)) { 1292 res = -EADDRNOTAVAIL; 1293 goto err_stop; 1294 } 1295 } 1296 1297 switch (sdata->vif.type) { 1298 case NL80211_IFTYPE_AP_VLAN: 1299 /* no need to tell driver, but set carrier and chanctx */ 1300 if (sdata->bss->active) { 1301 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1302 netif_carrier_on(dev); 1303 ieee80211_set_vif_encap_ops(sdata); 1304 } else { 1305 netif_carrier_off(dev); 1306 } 1307 break; 1308 case NL80211_IFTYPE_MONITOR: 1309 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1310 local->cooked_mntrs++; 1311 break; 1312 } 1313 1314 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1315 res = drv_add_interface(local, sdata); 1316 if (res) 1317 goto err_stop; 1318 } else if (local->monitors == 0 && local->open_count == 0) { 1319 res = ieee80211_add_virtual_monitor(local); 1320 if (res) 1321 goto err_stop; 1322 } 1323 1324 /* must be before the call to ieee80211_configure_filter */ 1325 local->monitors++; 1326 if (local->monitors == 1) { 1327 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1328 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1329 } 1330 1331 ieee80211_adjust_monitor_flags(sdata, 1); 1332 ieee80211_configure_filter(local); 1333 ieee80211_recalc_offload(local); 1334 mutex_lock(&local->mtx); 1335 ieee80211_recalc_idle(local); 1336 mutex_unlock(&local->mtx); 1337 1338 netif_carrier_on(dev); 1339 break; 1340 default: 1341 if (coming_up) { 1342 ieee80211_del_virtual_monitor(local); 1343 ieee80211_set_sdata_offload_flags(sdata); 1344 1345 res = drv_add_interface(local, sdata); 1346 if (res) 1347 goto err_stop; 1348 1349 ieee80211_set_vif_encap_ops(sdata); 1350 res = ieee80211_check_queues(sdata, 1351 ieee80211_vif_type_p2p(&sdata->vif)); 1352 if (res) 1353 goto err_del_interface; 1354 } 1355 1356 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1357 local->fif_pspoll++; 1358 local->fif_probe_req++; 1359 1360 ieee80211_configure_filter(local); 1361 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1362 local->fif_probe_req++; 1363 } 1364 1365 if (sdata->vif.probe_req_reg) 1366 drv_config_iface_filter(local, sdata, 1367 FIF_PROBE_REQ, 1368 FIF_PROBE_REQ); 1369 1370 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1371 sdata->vif.type != NL80211_IFTYPE_NAN) 1372 changed |= ieee80211_reset_erp_info(sdata); 1373 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1374 changed); 1375 1376 switch (sdata->vif.type) { 1377 case NL80211_IFTYPE_STATION: 1378 case NL80211_IFTYPE_ADHOC: 1379 case NL80211_IFTYPE_AP: 1380 case NL80211_IFTYPE_MESH_POINT: 1381 case NL80211_IFTYPE_OCB: 1382 netif_carrier_off(dev); 1383 break; 1384 case NL80211_IFTYPE_P2P_DEVICE: 1385 case NL80211_IFTYPE_NAN: 1386 break; 1387 default: 1388 /* not reached */ 1389 WARN_ON(1); 1390 } 1391 1392 /* 1393 * Set default queue parameters so drivers don't 1394 * need to initialise the hardware if the hardware 1395 * doesn't start up with sane defaults. 1396 * Enable QoS for anything but station interfaces. 1397 */ 1398 ieee80211_set_wmm_default(&sdata->deflink, true, 1399 sdata->vif.type != NL80211_IFTYPE_STATION); 1400 } 1401 1402 switch (sdata->vif.type) { 1403 case NL80211_IFTYPE_P2P_DEVICE: 1404 rcu_assign_pointer(local->p2p_sdata, sdata); 1405 break; 1406 case NL80211_IFTYPE_MONITOR: 1407 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1408 break; 1409 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1410 break; 1411 default: 1412 break; 1413 } 1414 1415 /* 1416 * set_multicast_list will be invoked by the networking core 1417 * which will check whether any increments here were done in 1418 * error and sync them down to the hardware as filter flags. 1419 */ 1420 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1421 atomic_inc(&local->iff_allmultis); 1422 1423 if (coming_up) 1424 local->open_count++; 1425 1426 if (hw_reconf_flags) 1427 ieee80211_hw_config(local, hw_reconf_flags); 1428 1429 ieee80211_recalc_ps(local); 1430 1431 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1432 1433 return 0; 1434 err_del_interface: 1435 drv_remove_interface(local, sdata); 1436 err_stop: 1437 if (!local->open_count) 1438 drv_stop(local); 1439 err_del_bss: 1440 sdata->bss = NULL; 1441 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1442 mutex_lock(&local->mtx); 1443 list_del(&sdata->u.vlan.list); 1444 mutex_unlock(&local->mtx); 1445 } 1446 /* might already be clear but that doesn't matter */ 1447 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1448 return res; 1449 } 1450 ieee80211_if_free(struct net_device * dev)1451 static void ieee80211_if_free(struct net_device *dev) 1452 { 1453 free_percpu(dev->tstats); 1454 } 1455 ieee80211_if_setup(struct net_device * dev)1456 static void ieee80211_if_setup(struct net_device *dev) 1457 { 1458 ether_setup(dev); 1459 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1460 dev->priv_flags |= IFF_NO_QUEUE; 1461 dev->netdev_ops = &ieee80211_dataif_ops; 1462 dev->needs_free_netdev = true; 1463 dev->priv_destructor = ieee80211_if_free; 1464 } 1465 ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1466 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1467 struct ieee80211_sub_if_data *sdata, 1468 struct sk_buff *skb) 1469 { 1470 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1471 1472 if (ieee80211_is_action(mgmt->frame_control) && 1473 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1474 struct sta_info *sta; 1475 int len = skb->len; 1476 1477 mutex_lock(&local->sta_mtx); 1478 sta = sta_info_get_bss(sdata, mgmt->sa); 1479 if (sta) { 1480 switch (mgmt->u.action.u.addba_req.action_code) { 1481 case WLAN_ACTION_ADDBA_REQ: 1482 ieee80211_process_addba_request(local, sta, 1483 mgmt, len); 1484 break; 1485 case WLAN_ACTION_ADDBA_RESP: 1486 ieee80211_process_addba_resp(local, sta, 1487 mgmt, len); 1488 break; 1489 case WLAN_ACTION_DELBA: 1490 ieee80211_process_delba(sdata, sta, 1491 mgmt, len); 1492 break; 1493 default: 1494 WARN_ON(1); 1495 break; 1496 } 1497 } 1498 mutex_unlock(&local->sta_mtx); 1499 } else if (ieee80211_is_action(mgmt->frame_control) && 1500 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1501 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1502 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1503 struct ieee80211_rx_status *status; 1504 enum nl80211_band band; 1505 struct sta_info *sta; 1506 u8 opmode; 1507 1508 status = IEEE80211_SKB_RXCB(skb); 1509 band = status->band; 1510 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1511 1512 mutex_lock(&local->sta_mtx); 1513 sta = sta_info_get_bss(sdata, mgmt->sa); 1514 1515 if (sta) 1516 ieee80211_vht_handle_opmode(sdata, 1517 &sta->deflink, 1518 opmode, band); 1519 1520 mutex_unlock(&local->sta_mtx); 1521 break; 1522 } 1523 case WLAN_VHT_ACTION_GROUPID_MGMT: 1524 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1525 mgmt); 1526 break; 1527 default: 1528 WARN_ON(1); 1529 break; 1530 } 1531 } else if (ieee80211_is_action(mgmt->frame_control) && 1532 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1533 switch (mgmt->u.action.u.s1g.action_code) { 1534 case WLAN_S1G_TWT_TEARDOWN: 1535 case WLAN_S1G_TWT_SETUP: 1536 ieee80211_s1g_rx_twt_action(sdata, skb); 1537 break; 1538 default: 1539 break; 1540 } 1541 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1542 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1543 ieee80211_sta_rx_queued_ext(sdata, skb); 1544 else 1545 WARN_ON(1); 1546 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1547 struct ieee80211_hdr *hdr = (void *)mgmt; 1548 struct sta_info *sta; 1549 1550 /* 1551 * So the frame isn't mgmt, but frame_control 1552 * is at the right place anyway, of course, so 1553 * the if statement is correct. 1554 * 1555 * Warn if we have other data frame types here, 1556 * they must not get here. 1557 */ 1558 WARN_ON(hdr->frame_control & 1559 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1560 WARN_ON(!(hdr->seq_ctrl & 1561 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1562 /* 1563 * This was a fragment of a frame, received while 1564 * a block-ack session was active. That cannot be 1565 * right, so terminate the session. 1566 */ 1567 mutex_lock(&local->sta_mtx); 1568 sta = sta_info_get_bss(sdata, mgmt->sa); 1569 if (sta) { 1570 u16 tid = ieee80211_get_tid(hdr); 1571 1572 __ieee80211_stop_rx_ba_session( 1573 sta, tid, WLAN_BACK_RECIPIENT, 1574 WLAN_REASON_QSTA_REQUIRE_SETUP, 1575 true); 1576 } 1577 mutex_unlock(&local->sta_mtx); 1578 } else switch (sdata->vif.type) { 1579 case NL80211_IFTYPE_STATION: 1580 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1581 break; 1582 case NL80211_IFTYPE_ADHOC: 1583 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1584 break; 1585 case NL80211_IFTYPE_MESH_POINT: 1586 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1587 break; 1588 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1589 break; 1590 default: 1591 WARN(1, "frame for unexpected interface type"); 1592 break; 1593 } 1594 } 1595 ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1596 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1597 struct sk_buff *skb) 1598 { 1599 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1600 1601 if (ieee80211_is_action(mgmt->frame_control) && 1602 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1603 switch (mgmt->u.action.u.s1g.action_code) { 1604 case WLAN_S1G_TWT_TEARDOWN: 1605 case WLAN_S1G_TWT_SETUP: 1606 ieee80211_s1g_status_twt_action(sdata, skb); 1607 break; 1608 default: 1609 break; 1610 } 1611 } 1612 } 1613 ieee80211_iface_work(struct work_struct * work)1614 static void ieee80211_iface_work(struct work_struct *work) 1615 { 1616 struct ieee80211_sub_if_data *sdata = 1617 container_of(work, struct ieee80211_sub_if_data, work); 1618 struct ieee80211_local *local = sdata->local; 1619 struct sk_buff *skb; 1620 1621 if (!ieee80211_sdata_running(sdata)) 1622 return; 1623 1624 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1625 return; 1626 1627 if (!ieee80211_can_run_worker(local)) 1628 return; 1629 1630 /* first process frames */ 1631 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1632 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1633 1634 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1635 ieee80211_process_tdls_channel_switch(sdata, skb); 1636 else 1637 ieee80211_iface_process_skb(local, sdata, skb); 1638 1639 kfree_skb(skb); 1640 kcov_remote_stop(); 1641 } 1642 1643 /* process status queue */ 1644 while ((skb = skb_dequeue(&sdata->status_queue))) { 1645 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1646 1647 ieee80211_iface_process_status(sdata, skb); 1648 kfree_skb(skb); 1649 1650 kcov_remote_stop(); 1651 } 1652 1653 /* then other type-dependent work */ 1654 switch (sdata->vif.type) { 1655 case NL80211_IFTYPE_STATION: 1656 ieee80211_sta_work(sdata); 1657 break; 1658 case NL80211_IFTYPE_ADHOC: 1659 ieee80211_ibss_work(sdata); 1660 break; 1661 case NL80211_IFTYPE_MESH_POINT: 1662 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1663 break; 1664 ieee80211_mesh_work(sdata); 1665 break; 1666 case NL80211_IFTYPE_OCB: 1667 ieee80211_ocb_work(sdata); 1668 break; 1669 default: 1670 break; 1671 } 1672 } 1673 ieee80211_recalc_smps_work(struct work_struct * work)1674 static void ieee80211_recalc_smps_work(struct work_struct *work) 1675 { 1676 struct ieee80211_sub_if_data *sdata = 1677 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1678 1679 ieee80211_recalc_smps(sdata, &sdata->deflink); 1680 } 1681 ieee80211_activate_links_work(struct work_struct * work)1682 static void ieee80211_activate_links_work(struct work_struct *work) 1683 { 1684 struct ieee80211_sub_if_data *sdata = 1685 container_of(work, struct ieee80211_sub_if_data, 1686 activate_links_work); 1687 1688 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1689 } 1690 1691 /* 1692 * Helper function to initialise an interface to a specific type. 1693 */ ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1694 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1695 enum nl80211_iftype type) 1696 { 1697 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1698 0xff, 0xff, 0xff}; 1699 1700 /* clear type-dependent unions */ 1701 memset(&sdata->u, 0, sizeof(sdata->u)); 1702 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1703 1704 /* and set some type-dependent values */ 1705 sdata->vif.type = type; 1706 sdata->vif.p2p = false; 1707 sdata->wdev.iftype = type; 1708 1709 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1710 sdata->control_port_no_encrypt = false; 1711 sdata->control_port_over_nl80211 = false; 1712 sdata->control_port_no_preauth = false; 1713 sdata->vif.cfg.idle = true; 1714 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1715 1716 sdata->noack_map = 0; 1717 1718 /* only monitor/p2p-device differ */ 1719 if (sdata->dev) { 1720 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1721 sdata->dev->type = ARPHRD_ETHER; 1722 } 1723 1724 skb_queue_head_init(&sdata->skb_queue); 1725 skb_queue_head_init(&sdata->status_queue); 1726 INIT_WORK(&sdata->work, ieee80211_iface_work); 1727 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1728 INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work); 1729 1730 switch (type) { 1731 case NL80211_IFTYPE_P2P_GO: 1732 type = NL80211_IFTYPE_AP; 1733 sdata->vif.type = type; 1734 sdata->vif.p2p = true; 1735 fallthrough; 1736 case NL80211_IFTYPE_AP: 1737 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1738 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1739 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1740 break; 1741 case NL80211_IFTYPE_P2P_CLIENT: 1742 type = NL80211_IFTYPE_STATION; 1743 sdata->vif.type = type; 1744 sdata->vif.p2p = true; 1745 fallthrough; 1746 case NL80211_IFTYPE_STATION: 1747 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1748 ieee80211_sta_setup_sdata(sdata); 1749 break; 1750 case NL80211_IFTYPE_OCB: 1751 sdata->vif.bss_conf.bssid = bssid_wildcard; 1752 ieee80211_ocb_setup_sdata(sdata); 1753 break; 1754 case NL80211_IFTYPE_ADHOC: 1755 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1756 ieee80211_ibss_setup_sdata(sdata); 1757 break; 1758 case NL80211_IFTYPE_MESH_POINT: 1759 if (ieee80211_vif_is_mesh(&sdata->vif)) 1760 ieee80211_mesh_init_sdata(sdata); 1761 break; 1762 case NL80211_IFTYPE_MONITOR: 1763 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1764 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1765 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1766 MONITOR_FLAG_OTHER_BSS; 1767 break; 1768 case NL80211_IFTYPE_NAN: 1769 idr_init(&sdata->u.nan.function_inst_ids); 1770 spin_lock_init(&sdata->u.nan.func_lock); 1771 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1772 break; 1773 case NL80211_IFTYPE_AP_VLAN: 1774 case NL80211_IFTYPE_P2P_DEVICE: 1775 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1776 break; 1777 case NL80211_IFTYPE_UNSPECIFIED: 1778 case NL80211_IFTYPE_WDS: 1779 case NUM_NL80211_IFTYPES: 1780 WARN_ON(1); 1781 break; 1782 } 1783 1784 /* need to do this after the switch so vif.type is correct */ 1785 ieee80211_link_setup(&sdata->deflink); 1786 1787 ieee80211_debugfs_add_netdev(sdata); 1788 } 1789 ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1790 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1791 enum nl80211_iftype type) 1792 { 1793 struct ieee80211_local *local = sdata->local; 1794 int ret, err; 1795 enum nl80211_iftype internal_type = type; 1796 bool p2p = false; 1797 1798 ASSERT_RTNL(); 1799 1800 if (!local->ops->change_interface) 1801 return -EBUSY; 1802 1803 /* for now, don't support changing while links exist */ 1804 if (sdata->vif.valid_links) 1805 return -EBUSY; 1806 1807 switch (sdata->vif.type) { 1808 case NL80211_IFTYPE_AP: 1809 if (!list_empty(&sdata->u.ap.vlans)) 1810 return -EBUSY; 1811 break; 1812 case NL80211_IFTYPE_STATION: 1813 case NL80211_IFTYPE_ADHOC: 1814 case NL80211_IFTYPE_OCB: 1815 /* 1816 * Could maybe also all others here? 1817 * Just not sure how that interacts 1818 * with the RX/config path e.g. for 1819 * mesh. 1820 */ 1821 break; 1822 default: 1823 return -EBUSY; 1824 } 1825 1826 switch (type) { 1827 case NL80211_IFTYPE_AP: 1828 case NL80211_IFTYPE_STATION: 1829 case NL80211_IFTYPE_ADHOC: 1830 case NL80211_IFTYPE_OCB: 1831 /* 1832 * Could probably support everything 1833 * but here. 1834 */ 1835 break; 1836 case NL80211_IFTYPE_P2P_CLIENT: 1837 p2p = true; 1838 internal_type = NL80211_IFTYPE_STATION; 1839 break; 1840 case NL80211_IFTYPE_P2P_GO: 1841 p2p = true; 1842 internal_type = NL80211_IFTYPE_AP; 1843 break; 1844 default: 1845 return -EBUSY; 1846 } 1847 1848 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1849 if (ret) 1850 return ret; 1851 1852 ieee80211_stop_vif_queues(local, sdata, 1853 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1854 /* do_stop will synchronize_rcu() first thing */ 1855 ieee80211_do_stop(sdata, false); 1856 1857 ieee80211_teardown_sdata(sdata); 1858 1859 ieee80211_set_sdata_offload_flags(sdata); 1860 ret = drv_change_interface(local, sdata, internal_type, p2p); 1861 if (ret) 1862 type = ieee80211_vif_type_p2p(&sdata->vif); 1863 1864 /* 1865 * Ignore return value here, there's not much we can do since 1866 * the driver changed the interface type internally already. 1867 * The warnings will hopefully make driver authors fix it :-) 1868 */ 1869 ieee80211_check_queues(sdata, type); 1870 1871 ieee80211_setup_sdata(sdata, type); 1872 ieee80211_set_vif_encap_ops(sdata); 1873 1874 err = ieee80211_do_open(&sdata->wdev, false); 1875 WARN(err, "type change: do_open returned %d", err); 1876 1877 ieee80211_wake_vif_queues(local, sdata, 1878 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1879 return ret; 1880 } 1881 ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1882 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1883 enum nl80211_iftype type) 1884 { 1885 int ret; 1886 1887 ASSERT_RTNL(); 1888 1889 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1890 return 0; 1891 1892 if (ieee80211_sdata_running(sdata)) { 1893 ret = ieee80211_runtime_change_iftype(sdata, type); 1894 if (ret) 1895 return ret; 1896 } else { 1897 /* Purge and reset type-dependent state. */ 1898 ieee80211_teardown_sdata(sdata); 1899 ieee80211_setup_sdata(sdata, type); 1900 } 1901 1902 /* reset some values that shouldn't be kept across type changes */ 1903 if (type == NL80211_IFTYPE_STATION) 1904 sdata->u.mgd.use_4addr = false; 1905 1906 return 0; 1907 } 1908 ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1909 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1910 u8 *perm_addr, enum nl80211_iftype type) 1911 { 1912 struct ieee80211_sub_if_data *sdata; 1913 u64 mask, start, addr, val, inc; 1914 u8 *m; 1915 u8 tmp_addr[ETH_ALEN]; 1916 int i; 1917 1918 /* default ... something at least */ 1919 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1920 1921 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1922 local->hw.wiphy->n_addresses <= 1) 1923 return; 1924 1925 mutex_lock(&local->iflist_mtx); 1926 1927 switch (type) { 1928 case NL80211_IFTYPE_MONITOR: 1929 /* doesn't matter */ 1930 break; 1931 case NL80211_IFTYPE_AP_VLAN: 1932 /* match up with an AP interface */ 1933 list_for_each_entry(sdata, &local->interfaces, list) { 1934 if (sdata->vif.type != NL80211_IFTYPE_AP) 1935 continue; 1936 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1937 break; 1938 } 1939 /* keep default if no AP interface present */ 1940 break; 1941 case NL80211_IFTYPE_P2P_CLIENT: 1942 case NL80211_IFTYPE_P2P_GO: 1943 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1944 list_for_each_entry(sdata, &local->interfaces, list) { 1945 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1946 continue; 1947 if (!ieee80211_sdata_running(sdata)) 1948 continue; 1949 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1950 goto out_unlock; 1951 } 1952 } 1953 fallthrough; 1954 default: 1955 /* assign a new address if possible -- try n_addresses first */ 1956 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1957 bool used = false; 1958 1959 list_for_each_entry(sdata, &local->interfaces, list) { 1960 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1961 sdata->vif.addr)) { 1962 used = true; 1963 break; 1964 } 1965 } 1966 1967 if (!used) { 1968 memcpy(perm_addr, 1969 local->hw.wiphy->addresses[i].addr, 1970 ETH_ALEN); 1971 break; 1972 } 1973 } 1974 1975 /* try mask if available */ 1976 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1977 break; 1978 1979 m = local->hw.wiphy->addr_mask; 1980 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1981 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1982 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1983 1984 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1985 /* not a contiguous mask ... not handled now! */ 1986 pr_info("not contiguous\n"); 1987 break; 1988 } 1989 1990 /* 1991 * Pick address of existing interface in case user changed 1992 * MAC address manually, default to perm_addr. 1993 */ 1994 m = local->hw.wiphy->perm_addr; 1995 list_for_each_entry(sdata, &local->interfaces, list) { 1996 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1997 continue; 1998 m = sdata->vif.addr; 1999 break; 2000 } 2001 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2002 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2003 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2004 2005 inc = 1ULL<<__ffs64(mask); 2006 val = (start & mask); 2007 addr = (start & ~mask) | (val & mask); 2008 do { 2009 bool used = false; 2010 2011 tmp_addr[5] = addr >> 0*8; 2012 tmp_addr[4] = addr >> 1*8; 2013 tmp_addr[3] = addr >> 2*8; 2014 tmp_addr[2] = addr >> 3*8; 2015 tmp_addr[1] = addr >> 4*8; 2016 tmp_addr[0] = addr >> 5*8; 2017 2018 val += inc; 2019 2020 list_for_each_entry(sdata, &local->interfaces, list) { 2021 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2022 used = true; 2023 break; 2024 } 2025 } 2026 2027 if (!used) { 2028 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2029 break; 2030 } 2031 addr = (start & ~mask) | (val & mask); 2032 } while (addr != start); 2033 2034 break; 2035 } 2036 2037 out_unlock: 2038 mutex_unlock(&local->iflist_mtx); 2039 } 2040 ieee80211_if_add(struct ieee80211_local * local,const char * name,unsigned char name_assign_type,struct wireless_dev ** new_wdev,enum nl80211_iftype type,struct vif_params * params)2041 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2042 unsigned char name_assign_type, 2043 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2044 struct vif_params *params) 2045 { 2046 struct net_device *ndev = NULL; 2047 struct ieee80211_sub_if_data *sdata = NULL; 2048 struct txq_info *txqi; 2049 int ret, i; 2050 2051 ASSERT_RTNL(); 2052 2053 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2054 struct wireless_dev *wdev; 2055 2056 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2057 GFP_KERNEL); 2058 if (!sdata) 2059 return -ENOMEM; 2060 wdev = &sdata->wdev; 2061 2062 sdata->dev = NULL; 2063 strscpy(sdata->name, name, IFNAMSIZ); 2064 ieee80211_assign_perm_addr(local, wdev->address, type); 2065 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2066 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2067 } else { 2068 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2069 sizeof(void *)); 2070 int txq_size = 0; 2071 2072 if (type != NL80211_IFTYPE_AP_VLAN && 2073 (type != NL80211_IFTYPE_MONITOR || 2074 (params->flags & MONITOR_FLAG_ACTIVE))) 2075 txq_size += sizeof(struct txq_info) + 2076 local->hw.txq_data_size; 2077 2078 ndev = alloc_netdev_mqs(size + txq_size, 2079 name, name_assign_type, 2080 ieee80211_if_setup, 1, 1); 2081 if (!ndev) 2082 return -ENOMEM; 2083 2084 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2085 2086 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2087 if (!ndev->tstats) { 2088 free_netdev(ndev); 2089 return -ENOMEM; 2090 } 2091 2092 ndev->needed_headroom = local->tx_headroom + 2093 4*6 /* four MAC addresses */ 2094 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2095 + 6 /* mesh */ 2096 + 8 /* rfc1042/bridge tunnel */ 2097 - ETH_HLEN /* ethernet hard_header_len */ 2098 + IEEE80211_ENCRYPT_HEADROOM; 2099 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2100 2101 ret = dev_alloc_name(ndev, ndev->name); 2102 if (ret < 0) { 2103 ieee80211_if_free(ndev); 2104 free_netdev(ndev); 2105 return ret; 2106 } 2107 2108 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2109 if (is_valid_ether_addr(params->macaddr)) 2110 eth_hw_addr_set(ndev, params->macaddr); 2111 else 2112 eth_hw_addr_set(ndev, ndev->perm_addr); 2113 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2114 2115 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2116 sdata = netdev_priv(ndev); 2117 ndev->ieee80211_ptr = &sdata->wdev; 2118 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2119 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2120 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2121 2122 if (txq_size) { 2123 txqi = netdev_priv(ndev) + size; 2124 ieee80211_txq_init(sdata, NULL, txqi, 0); 2125 } 2126 2127 sdata->dev = ndev; 2128 } 2129 2130 /* initialise type-independent data */ 2131 sdata->wdev.wiphy = local->hw.wiphy; 2132 2133 ieee80211_sdata_init(local, sdata); 2134 2135 ieee80211_init_frag_cache(&sdata->frags); 2136 2137 INIT_LIST_HEAD(&sdata->key_list); 2138 2139 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 2140 ieee80211_delayed_tailroom_dec); 2141 2142 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2143 struct ieee80211_supported_band *sband; 2144 sband = local->hw.wiphy->bands[i]; 2145 sdata->rc_rateidx_mask[i] = 2146 sband ? (1 << sband->n_bitrates) - 1 : 0; 2147 if (sband) { 2148 __le16 cap; 2149 u16 *vht_rate_mask; 2150 2151 memcpy(sdata->rc_rateidx_mcs_mask[i], 2152 sband->ht_cap.mcs.rx_mask, 2153 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2154 2155 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2156 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2157 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2158 } else { 2159 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2160 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2161 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2162 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2163 } 2164 } 2165 2166 ieee80211_set_default_queues(sdata); 2167 2168 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2169 sdata->deflink.user_power_level = local->user_power_level; 2170 2171 /* setup type-dependent data */ 2172 ieee80211_setup_sdata(sdata, type); 2173 2174 if (ndev) { 2175 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2176 if (type == NL80211_IFTYPE_STATION) 2177 sdata->u.mgd.use_4addr = params->use_4addr; 2178 2179 ndev->features |= local->hw.netdev_features; 2180 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2181 ndev->hw_features |= ndev->features & 2182 MAC80211_SUPPORTED_FEATURES_TX; 2183 sdata->vif.netdev_features = local->hw.netdev_features; 2184 2185 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2186 2187 /* MTU range is normally 256 - 2304, where the upper limit is 2188 * the maximum MSDU size. Monitor interfaces send and receive 2189 * MPDU and A-MSDU frames which may be much larger so we do 2190 * not impose an upper limit in that case. 2191 */ 2192 ndev->min_mtu = 256; 2193 if (type == NL80211_IFTYPE_MONITOR) 2194 ndev->max_mtu = 0; 2195 else 2196 ndev->max_mtu = local->hw.max_mtu; 2197 2198 ret = cfg80211_register_netdevice(ndev); 2199 if (ret) { 2200 free_netdev(ndev); 2201 return ret; 2202 } 2203 } 2204 2205 mutex_lock(&local->iflist_mtx); 2206 list_add_tail_rcu(&sdata->list, &local->interfaces); 2207 mutex_unlock(&local->iflist_mtx); 2208 2209 if (new_wdev) 2210 *new_wdev = &sdata->wdev; 2211 2212 return 0; 2213 } 2214 ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2215 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2216 { 2217 ASSERT_RTNL(); 2218 2219 mutex_lock(&sdata->local->iflist_mtx); 2220 list_del_rcu(&sdata->list); 2221 mutex_unlock(&sdata->local->iflist_mtx); 2222 2223 if (sdata->vif.txq) 2224 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2225 2226 synchronize_rcu(); 2227 2228 cfg80211_unregister_wdev(&sdata->wdev); 2229 2230 if (!sdata->dev) { 2231 ieee80211_teardown_sdata(sdata); 2232 kfree(sdata); 2233 } 2234 } 2235 ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2236 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2237 { 2238 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2239 return; 2240 ieee80211_do_stop(sdata, true); 2241 } 2242 ieee80211_remove_interfaces(struct ieee80211_local * local)2243 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2244 { 2245 struct ieee80211_sub_if_data *sdata, *tmp; 2246 LIST_HEAD(unreg_list); 2247 LIST_HEAD(wdev_list); 2248 2249 ASSERT_RTNL(); 2250 2251 /* Before destroying the interfaces, make sure they're all stopped so 2252 * that the hardware is stopped. Otherwise, the driver might still be 2253 * iterating the interfaces during the shutdown, e.g. from a worker 2254 * or from RX processing or similar, and if it does so (using atomic 2255 * iteration) while we're manipulating the list, the iteration will 2256 * crash. 2257 * 2258 * After this, the hardware should be stopped and the driver should 2259 * have stopped all of its activities, so that we can do RCU-unaware 2260 * manipulations of the interface list below. 2261 */ 2262 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2263 2264 WARN(local->open_count, "%s: open count remains %d\n", 2265 wiphy_name(local->hw.wiphy), local->open_count); 2266 2267 ieee80211_txq_teardown_flows(local); 2268 2269 mutex_lock(&local->iflist_mtx); 2270 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 2271 list_del(&sdata->list); 2272 2273 if (sdata->dev) 2274 unregister_netdevice_queue(sdata->dev, &unreg_list); 2275 else 2276 list_add(&sdata->list, &wdev_list); 2277 } 2278 mutex_unlock(&local->iflist_mtx); 2279 2280 unregister_netdevice_many(&unreg_list); 2281 2282 wiphy_lock(local->hw.wiphy); 2283 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 2284 list_del(&sdata->list); 2285 cfg80211_unregister_wdev(&sdata->wdev); 2286 kfree(sdata); 2287 } 2288 wiphy_unlock(local->hw.wiphy); 2289 } 2290 netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2291 static int netdev_notify(struct notifier_block *nb, 2292 unsigned long state, void *ptr) 2293 { 2294 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2295 struct ieee80211_sub_if_data *sdata; 2296 2297 if (state != NETDEV_CHANGENAME) 2298 return NOTIFY_DONE; 2299 2300 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2301 return NOTIFY_DONE; 2302 2303 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2304 return NOTIFY_DONE; 2305 2306 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2307 memcpy(sdata->name, dev->name, IFNAMSIZ); 2308 ieee80211_debugfs_rename_netdev(sdata); 2309 2310 return NOTIFY_OK; 2311 } 2312 2313 static struct notifier_block mac80211_netdev_notifier = { 2314 .notifier_call = netdev_notify, 2315 }; 2316 ieee80211_iface_init(void)2317 int ieee80211_iface_init(void) 2318 { 2319 return register_netdevice_notifier(&mac80211_netdev_notifier); 2320 } 2321 ieee80211_iface_exit(void)2322 void ieee80211_iface_exit(void) 2323 { 2324 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2325 } 2326 ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2327 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2328 { 2329 if (sdata->vif.type == NL80211_IFTYPE_AP) 2330 atomic_inc(&sdata->u.ap.num_mcast_sta); 2331 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2332 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2333 } 2334 ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2335 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2336 { 2337 if (sdata->vif.type == NL80211_IFTYPE_AP) 2338 atomic_dec(&sdata->u.ap.num_mcast_sta); 2339 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2340 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2341 } 2342