1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Interface handling 4 * 5 * Copyright 2002-2005, Instant802 Networks, Inc. 6 * Copyright 2005-2006, Devicescape Software, Inc. 7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 9 * Copyright 2013-2014 Intel Mobile Communications GmbH 10 * Copyright (c) 2016 Intel Deutschland GmbH 11 * Copyright (C) 2018-2024 Intel Corporation 12 */ 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/if_arp.h> 16 #include <linux/netdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/kcov.h> 19 #include <net/mac80211.h> 20 #include <net/ieee80211_radiotap.h> 21 #include "ieee80211_i.h" 22 #include "sta_info.h" 23 #include "debugfs_netdev.h" 24 #include "mesh.h" 25 #include "led.h" 26 #include "driver-ops.h" 27 #include "wme.h" 28 #include "rate.h" 29 30 /** 31 * DOC: Interface list locking 32 * 33 * The interface list in each struct ieee80211_local is protected 34 * three-fold: 35 * 36 * (1) modifications may only be done under the RTNL *and* wiphy mutex 37 * *and* iflist_mtx 38 * (2) modifications are done in an RCU manner so atomic readers 39 * can traverse the list in RCU-safe blocks. 40 * 41 * As a consequence, reads (traversals) of the list can be protected 42 * by either the RTNL, the wiphy mutex, the iflist_mtx or RCU. 43 */ 44 45 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work); 46 __ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 48 { 49 struct ieee80211_chanctx_conf *chanctx_conf; 50 int power; 51 52 rcu_read_lock(); 53 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 54 if (!chanctx_conf) { 55 rcu_read_unlock(); 56 return false; 57 } 58 59 power = ieee80211_chandef_max_power(&chanctx_conf->def); 60 rcu_read_unlock(); 61 62 if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL) 63 power = min(power, sdata->deflink.user_power_level); 64 65 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 66 power = min(power, sdata->deflink.ap_power_level); 67 68 if (power != sdata->vif.bss_conf.txpower) { 69 sdata->vif.bss_conf.txpower = power; 70 ieee80211_hw_config(sdata->local, 0); 71 return true; 72 } 73 74 return false; 75 } 76 ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 78 bool update_bss) 79 { 80 if (__ieee80211_recalc_txpower(sdata) || 81 (update_bss && ieee80211_sdata_running(sdata))) 82 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 83 BSS_CHANGED_TXPOWER); 84 } 85 __ieee80211_idle_off(struct ieee80211_local * local)86 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 87 { 88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 89 return 0; 90 91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 92 return IEEE80211_CONF_CHANGE_IDLE; 93 } 94 __ieee80211_idle_on(struct ieee80211_local * local)95 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 96 { 97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 98 return 0; 99 100 ieee80211_flush_queues(local, NULL, false); 101 102 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 103 return IEEE80211_CONF_CHANGE_IDLE; 104 } 105 __ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 107 bool force_active) 108 { 109 bool working, scanning, active; 110 unsigned int led_trig_start = 0, led_trig_stop = 0; 111 112 lockdep_assert_wiphy(local->hw.wiphy); 113 114 active = force_active || 115 !list_empty(&local->chanctx_list) || 116 local->monitors; 117 118 working = !local->ops->remain_on_channel && 119 !list_empty(&local->roc_list); 120 121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 123 124 if (working || scanning) 125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 else 127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 128 129 if (active) 130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 else 132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 133 134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 135 136 if (working || scanning || active) 137 return __ieee80211_idle_off(local); 138 return __ieee80211_idle_on(local); 139 } 140 ieee80211_idle_off(struct ieee80211_local * local)141 u32 ieee80211_idle_off(struct ieee80211_local *local) 142 { 143 return __ieee80211_recalc_idle(local, true); 144 } 145 ieee80211_recalc_idle(struct ieee80211_local * local)146 void ieee80211_recalc_idle(struct ieee80211_local *local) 147 { 148 u32 change = __ieee80211_recalc_idle(local, false); 149 if (change) 150 ieee80211_hw_config(local, change); 151 } 152 ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 154 bool check_dup) 155 { 156 struct ieee80211_local *local = sdata->local; 157 struct ieee80211_sub_if_data *iter; 158 u64 new, mask, tmp; 159 u8 *m; 160 int ret = 0; 161 162 lockdep_assert_wiphy(local->hw.wiphy); 163 164 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 165 return 0; 166 167 m = addr; 168 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 169 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 170 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 171 172 m = local->hw.wiphy->addr_mask; 173 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 176 177 if (!check_dup) 178 return ret; 179 180 list_for_each_entry(iter, &local->interfaces, list) { 181 if (iter == sdata) 182 continue; 183 184 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 186 continue; 187 188 m = iter->vif.addr; 189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 192 193 if ((new & ~mask) != (tmp & ~mask)) { 194 ret = -EINVAL; 195 break; 196 } 197 } 198 199 return ret; 200 } 201 ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data * sdata)202 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata) 203 { 204 struct ieee80211_roc_work *roc; 205 struct ieee80211_local *local = sdata->local; 206 struct ieee80211_sub_if_data *scan_sdata; 207 int ret = 0; 208 209 lockdep_assert_wiphy(local->hw.wiphy); 210 211 /* To be the most flexible here we want to only limit changing the 212 * address if the specific interface is doing offchannel work or 213 * scanning. 214 */ 215 if (netif_carrier_ok(sdata->dev)) 216 return -EBUSY; 217 218 /* First check no ROC work is happening on this iface */ 219 list_for_each_entry(roc, &local->roc_list, list) { 220 if (roc->sdata != sdata) 221 continue; 222 223 if (roc->started) { 224 ret = -EBUSY; 225 goto unlock; 226 } 227 } 228 229 /* And if this iface is scanning */ 230 if (local->scanning) { 231 scan_sdata = rcu_dereference_protected(local->scan_sdata, 232 lockdep_is_held(&local->hw.wiphy->mtx)); 233 if (sdata == scan_sdata) 234 ret = -EBUSY; 235 } 236 237 switch (sdata->vif.type) { 238 case NL80211_IFTYPE_STATION: 239 case NL80211_IFTYPE_P2P_CLIENT: 240 /* More interface types could be added here but changing the 241 * address while powered makes the most sense in client modes. 242 */ 243 break; 244 default: 245 ret = -EOPNOTSUPP; 246 } 247 248 unlock: 249 return ret; 250 } 251 _ieee80211_change_mac(struct ieee80211_sub_if_data * sdata,void * addr)252 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata, 253 void *addr) 254 { 255 struct ieee80211_local *local = sdata->local; 256 struct sockaddr *sa = addr; 257 bool check_dup = true; 258 bool live = false; 259 int ret; 260 261 if (ieee80211_sdata_running(sdata)) { 262 ret = ieee80211_can_powered_addr_change(sdata); 263 if (ret) 264 return ret; 265 266 live = true; 267 } 268 269 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 270 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 271 check_dup = false; 272 273 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 274 if (ret) 275 return ret; 276 277 if (live) 278 drv_remove_interface(local, sdata); 279 ret = eth_mac_addr(sdata->dev, sa); 280 281 if (ret == 0) { 282 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 283 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 284 } 285 286 /* Regardless of eth_mac_addr() return we still want to add the 287 * interface back. This should not fail... 288 */ 289 if (live) 290 WARN_ON(drv_add_interface(local, sdata)); 291 292 return ret; 293 } 294 ieee80211_change_mac(struct net_device * dev,void * addr)295 static int ieee80211_change_mac(struct net_device *dev, void *addr) 296 { 297 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 298 struct ieee80211_local *local = sdata->local; 299 int ret; 300 301 /* 302 * This happens during unregistration if there's a bond device 303 * active (maybe other cases?) and we must get removed from it. 304 * But we really don't care anymore if it's not registered now. 305 */ 306 if (!dev->ieee80211_ptr->registered) 307 return 0; 308 309 wiphy_lock(local->hw.wiphy); 310 ret = _ieee80211_change_mac(sdata, addr); 311 wiphy_unlock(local->hw.wiphy); 312 313 return ret; 314 } 315 identical_mac_addr_allowed(int type1,int type2)316 static inline int identical_mac_addr_allowed(int type1, int type2) 317 { 318 return type1 == NL80211_IFTYPE_MONITOR || 319 type2 == NL80211_IFTYPE_MONITOR || 320 type1 == NL80211_IFTYPE_P2P_DEVICE || 321 type2 == NL80211_IFTYPE_P2P_DEVICE || 322 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 323 (type1 == NL80211_IFTYPE_AP_VLAN && 324 (type2 == NL80211_IFTYPE_AP || 325 type2 == NL80211_IFTYPE_AP_VLAN)); 326 } 327 ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)328 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 329 enum nl80211_iftype iftype) 330 { 331 struct ieee80211_local *local = sdata->local; 332 struct ieee80211_sub_if_data *nsdata; 333 334 ASSERT_RTNL(); 335 lockdep_assert_wiphy(local->hw.wiphy); 336 337 /* we hold the RTNL here so can safely walk the list */ 338 list_for_each_entry(nsdata, &local->interfaces, list) { 339 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 340 /* 341 * Only OCB and monitor mode may coexist 342 */ 343 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 344 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 345 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 346 nsdata->vif.type == NL80211_IFTYPE_OCB)) 347 return -EBUSY; 348 349 /* 350 * Allow only a single IBSS interface to be up at any 351 * time. This is restricted because beacon distribution 352 * cannot work properly if both are in the same IBSS. 353 * 354 * To remove this restriction we'd have to disallow them 355 * from setting the same SSID on different IBSS interfaces 356 * belonging to the same hardware. Then, however, we're 357 * faced with having to adopt two different TSF timers... 358 */ 359 if (iftype == NL80211_IFTYPE_ADHOC && 360 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 361 return -EBUSY; 362 /* 363 * will not add another interface while any channel 364 * switch is active. 365 */ 366 if (nsdata->vif.bss_conf.csa_active) 367 return -EBUSY; 368 369 /* 370 * The remaining checks are only performed for interfaces 371 * with the same MAC address. 372 */ 373 if (!ether_addr_equal(sdata->vif.addr, 374 nsdata->vif.addr)) 375 continue; 376 377 /* 378 * check whether it may have the same address 379 */ 380 if (!identical_mac_addr_allowed(iftype, 381 nsdata->vif.type)) 382 return -ENOTUNIQ; 383 384 /* No support for VLAN with MLO yet */ 385 if (iftype == NL80211_IFTYPE_AP_VLAN && 386 sdata->wdev.use_4addr && 387 nsdata->vif.type == NL80211_IFTYPE_AP && 388 nsdata->vif.valid_links) 389 return -EOPNOTSUPP; 390 391 /* 392 * can only add VLANs to enabled APs 393 */ 394 if (iftype == NL80211_IFTYPE_AP_VLAN && 395 nsdata->vif.type == NL80211_IFTYPE_AP) 396 sdata->bss = &nsdata->u.ap; 397 } 398 } 399 400 return ieee80211_check_combinations(sdata, NULL, 0, 0, -1); 401 } 402 ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)403 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 404 enum nl80211_iftype iftype) 405 { 406 int n_queues = sdata->local->hw.queues; 407 int i; 408 409 if (iftype == NL80211_IFTYPE_NAN) 410 return 0; 411 412 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 413 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 414 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 415 IEEE80211_INVAL_HW_QUEUE)) 416 return -EINVAL; 417 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 418 n_queues)) 419 return -EINVAL; 420 } 421 } 422 423 if ((iftype != NL80211_IFTYPE_AP && 424 iftype != NL80211_IFTYPE_P2P_GO && 425 iftype != NL80211_IFTYPE_MESH_POINT) || 426 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 427 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 428 return 0; 429 } 430 431 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 432 return -EINVAL; 433 434 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 435 return -EINVAL; 436 437 return 0; 438 } 439 ieee80211_open(struct net_device * dev)440 static int ieee80211_open(struct net_device *dev) 441 { 442 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 443 int err; 444 445 /* fail early if user set an invalid address */ 446 if (!is_valid_ether_addr(dev->dev_addr)) 447 return -EADDRNOTAVAIL; 448 449 wiphy_lock(sdata->local->hw.wiphy); 450 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 451 if (err) 452 goto out; 453 454 err = ieee80211_do_open(&sdata->wdev, true); 455 out: 456 wiphy_unlock(sdata->local->hw.wiphy); 457 458 return err; 459 } 460 ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)461 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down) 462 { 463 struct ieee80211_local *local = sdata->local; 464 unsigned long flags; 465 struct sk_buff_head freeq; 466 struct sk_buff *skb, *tmp; 467 u32 hw_reconf_flags = 0; 468 int i, flushed; 469 struct ps_data *ps; 470 struct cfg80211_chan_def chandef; 471 bool cancel_scan; 472 struct cfg80211_nan_func *func; 473 474 lockdep_assert_wiphy(local->hw.wiphy); 475 476 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 477 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */ 478 479 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 480 if (cancel_scan) 481 ieee80211_scan_cancel(local); 482 483 ieee80211_roc_purge(local, sdata); 484 485 switch (sdata->vif.type) { 486 case NL80211_IFTYPE_STATION: 487 ieee80211_mgd_stop(sdata); 488 break; 489 case NL80211_IFTYPE_ADHOC: 490 ieee80211_ibss_stop(sdata); 491 break; 492 case NL80211_IFTYPE_MONITOR: 493 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 494 break; 495 list_del_rcu(&sdata->u.mntr.list); 496 break; 497 default: 498 break; 499 } 500 501 /* 502 * Remove all stations associated with this interface. 503 * 504 * This must be done before calling ops->remove_interface() 505 * because otherwise we can later invoke ops->sta_notify() 506 * whenever the STAs are removed, and that invalidates driver 507 * assumptions about always getting a vif pointer that is valid 508 * (because if we remove a STA after ops->remove_interface() 509 * the driver will have removed the vif info already!) 510 * 511 * For AP_VLANs stations may exist since there's nothing else that 512 * would have removed them, but in other modes there shouldn't 513 * be any stations. 514 */ 515 flushed = sta_info_flush(sdata, -1); 516 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0); 517 518 /* don't count this interface for allmulti while it is down */ 519 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 520 atomic_dec(&local->iff_allmultis); 521 522 if (sdata->vif.type == NL80211_IFTYPE_AP) { 523 local->fif_pspoll--; 524 local->fif_probe_req--; 525 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 526 local->fif_probe_req--; 527 } 528 529 if (sdata->dev) { 530 netif_addr_lock_bh(sdata->dev); 531 spin_lock_bh(&local->filter_lock); 532 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 533 sdata->dev->addr_len); 534 spin_unlock_bh(&local->filter_lock); 535 netif_addr_unlock_bh(sdata->dev); 536 } 537 538 del_timer_sync(&local->dynamic_ps_timer); 539 wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work); 540 541 WARN(ieee80211_vif_is_mld(&sdata->vif), 542 "destroying interface with valid links 0x%04x\n", 543 sdata->vif.valid_links); 544 545 sdata->vif.bss_conf.csa_active = false; 546 if (sdata->vif.type == NL80211_IFTYPE_STATION) 547 sdata->deflink.u.mgd.csa.waiting_bcn = false; 548 ieee80211_vif_unblock_queues_csa(sdata); 549 550 wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work); 551 wiphy_work_cancel(local->hw.wiphy, 552 &sdata->deflink.color_change_finalize_work); 553 wiphy_delayed_work_cancel(local->hw.wiphy, 554 &sdata->deflink.dfs_cac_timer_work); 555 556 if (sdata->wdev.links[0].cac_started) { 557 chandef = sdata->vif.bss_conf.chanreq.oper; 558 WARN_ON(local->suspended); 559 ieee80211_link_release_channel(&sdata->deflink); 560 cfg80211_cac_event(sdata->dev, &chandef, 561 NL80211_RADAR_CAC_ABORTED, 562 GFP_KERNEL, 0); 563 } 564 565 if (sdata->vif.type == NL80211_IFTYPE_AP) { 566 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 567 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 568 /* remove all packets in parent bc_buf pointing to this dev */ 569 ps = &sdata->bss->ps; 570 571 spin_lock_irqsave(&ps->bc_buf.lock, flags); 572 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 573 if (skb->dev == sdata->dev) { 574 __skb_unlink(skb, &ps->bc_buf); 575 local->total_ps_buffered--; 576 ieee80211_free_txskb(&local->hw, skb); 577 } 578 } 579 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 580 } 581 582 if (going_down) 583 local->open_count--; 584 585 switch (sdata->vif.type) { 586 case NL80211_IFTYPE_AP_VLAN: 587 list_del(&sdata->u.vlan.list); 588 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL); 589 /* see comment in the default case below */ 590 ieee80211_free_keys(sdata, true); 591 /* no need to tell driver */ 592 break; 593 case NL80211_IFTYPE_MONITOR: 594 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 595 local->cooked_mntrs--; 596 break; 597 } 598 599 local->monitors--; 600 if (local->monitors == 0) { 601 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 602 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 603 } 604 605 ieee80211_adjust_monitor_flags(sdata, -1); 606 break; 607 case NL80211_IFTYPE_NAN: 608 /* clean all the functions */ 609 spin_lock_bh(&sdata->u.nan.func_lock); 610 611 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 612 idr_remove(&sdata->u.nan.function_inst_ids, i); 613 cfg80211_free_nan_func(func); 614 } 615 idr_destroy(&sdata->u.nan.function_inst_ids); 616 617 spin_unlock_bh(&sdata->u.nan.func_lock); 618 break; 619 case NL80211_IFTYPE_P2P_DEVICE: 620 /* relies on synchronize_rcu() below */ 621 RCU_INIT_POINTER(local->p2p_sdata, NULL); 622 fallthrough; 623 default: 624 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work); 625 /* 626 * When we get here, the interface is marked down. 627 * Free the remaining keys, if there are any 628 * (which can happen in AP mode if userspace sets 629 * keys before the interface is operating) 630 * 631 * Force the key freeing to always synchronize_net() 632 * to wait for the RX path in case it is using this 633 * interface enqueuing frames at this very time on 634 * another CPU. 635 */ 636 ieee80211_free_keys(sdata, true); 637 skb_queue_purge(&sdata->skb_queue); 638 skb_queue_purge(&sdata->status_queue); 639 } 640 641 /* 642 * Since ieee80211_free_txskb() may issue __dev_queue_xmit() 643 * which should be called with interrupts enabled, reclamation 644 * is done in two phases: 645 */ 646 __skb_queue_head_init(&freeq); 647 648 /* unlink from local queues... */ 649 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 650 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 651 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 652 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 653 if (info->control.vif == &sdata->vif) { 654 __skb_unlink(skb, &local->pending[i]); 655 __skb_queue_tail(&freeq, skb); 656 } 657 } 658 } 659 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 660 661 /* ... and perform actual reclamation with interrupts enabled. */ 662 skb_queue_walk_safe(&freeq, skb, tmp) { 663 __skb_unlink(skb, &freeq); 664 ieee80211_free_txskb(&local->hw, skb); 665 } 666 667 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 668 ieee80211_txq_remove_vlan(local, sdata); 669 670 sdata->bss = NULL; 671 672 if (local->open_count == 0) 673 ieee80211_clear_tx_pending(local); 674 675 sdata->vif.bss_conf.beacon_int = 0; 676 677 /* 678 * If the interface goes down while suspended, presumably because 679 * the device was unplugged and that happens before our resume, 680 * then the driver is already unconfigured and the remainder of 681 * this function isn't needed. 682 * XXX: what about WoWLAN? If the device has software state, e.g. 683 * memory allocated, it might expect teardown commands from 684 * mac80211 here? 685 */ 686 if (local->suspended) { 687 WARN_ON(local->wowlan); 688 WARN_ON(rcu_access_pointer(local->monitor_sdata)); 689 return; 690 } 691 692 switch (sdata->vif.type) { 693 case NL80211_IFTYPE_AP_VLAN: 694 break; 695 case NL80211_IFTYPE_MONITOR: 696 if (local->monitors == 0) 697 ieee80211_del_virtual_monitor(local); 698 699 ieee80211_recalc_idle(local); 700 ieee80211_recalc_offload(local); 701 702 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 703 break; 704 705 fallthrough; 706 default: 707 if (!going_down) 708 break; 709 drv_remove_interface(local, sdata); 710 711 /* Clear private driver data to prevent reuse */ 712 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size); 713 } 714 715 ieee80211_recalc_ps(local); 716 717 if (cancel_scan) 718 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work); 719 720 if (local->open_count == 0) { 721 ieee80211_stop_device(local, false); 722 723 /* no reconfiguring after stop! */ 724 return; 725 } 726 727 /* do after stop to avoid reconfiguring when we stop anyway */ 728 ieee80211_configure_filter(local); 729 ieee80211_hw_config(local, hw_reconf_flags); 730 731 if (local->monitors == local->open_count) 732 ieee80211_add_virtual_monitor(local); 733 } 734 ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)735 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata) 736 { 737 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata; 738 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif; 739 740 if (!tx_vif) 741 return; 742 743 tx_sdata = vif_to_sdata(tx_vif); 744 sdata->vif.mbssid_tx_vif = NULL; 745 746 list_for_each_entry_safe(non_tx_sdata, tmp_sdata, 747 &tx_sdata->local->interfaces, list) { 748 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata && 749 non_tx_sdata->vif.mbssid_tx_vif == tx_vif && 750 ieee80211_sdata_running(non_tx_sdata)) { 751 non_tx_sdata->vif.mbssid_tx_vif = NULL; 752 dev_close(non_tx_sdata->wdev.netdev); 753 } 754 } 755 756 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) { 757 tx_sdata->vif.mbssid_tx_vif = NULL; 758 dev_close(tx_sdata->wdev.netdev); 759 } 760 } 761 ieee80211_stop(struct net_device * dev)762 static int ieee80211_stop(struct net_device *dev) 763 { 764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 765 766 /* close dependent VLAN and MBSSID interfaces before locking wiphy */ 767 if (sdata->vif.type == NL80211_IFTYPE_AP) { 768 struct ieee80211_sub_if_data *vlan, *tmpsdata; 769 770 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 771 u.vlan.list) 772 dev_close(vlan->dev); 773 774 ieee80211_stop_mbssid(sdata); 775 } 776 777 wiphy_lock(sdata->local->hw.wiphy); 778 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work); 779 780 ieee80211_do_stop(sdata, true); 781 wiphy_unlock(sdata->local->hw.wiphy); 782 783 return 0; 784 } 785 ieee80211_set_multicast_list(struct net_device * dev)786 static void ieee80211_set_multicast_list(struct net_device *dev) 787 { 788 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 789 struct ieee80211_local *local = sdata->local; 790 int allmulti, sdata_allmulti; 791 792 allmulti = !!(dev->flags & IFF_ALLMULTI); 793 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 794 795 if (allmulti != sdata_allmulti) { 796 if (dev->flags & IFF_ALLMULTI) 797 atomic_inc(&local->iff_allmultis); 798 else 799 atomic_dec(&local->iff_allmultis); 800 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 801 } 802 803 spin_lock_bh(&local->filter_lock); 804 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 805 spin_unlock_bh(&local->filter_lock); 806 wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter); 807 } 808 809 /* 810 * Called when the netdev is removed or, by the code below, before 811 * the interface type changes. 812 */ ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)813 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 814 { 815 /* free extra data */ 816 ieee80211_free_keys(sdata, false); 817 818 ieee80211_debugfs_remove_netdev(sdata); 819 820 ieee80211_destroy_frag_cache(&sdata->frags); 821 822 if (ieee80211_vif_is_mesh(&sdata->vif)) 823 ieee80211_mesh_teardown_sdata(sdata); 824 825 ieee80211_vif_clear_links(sdata); 826 ieee80211_link_stop(&sdata->deflink); 827 } 828 ieee80211_uninit(struct net_device * dev)829 static void ieee80211_uninit(struct net_device *dev) 830 { 831 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 832 } 833 ieee80211_netdev_setup_tc(struct net_device * dev,enum tc_setup_type type,void * type_data)834 static int ieee80211_netdev_setup_tc(struct net_device *dev, 835 enum tc_setup_type type, void *type_data) 836 { 837 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 838 struct ieee80211_local *local = sdata->local; 839 840 return drv_net_setup_tc(local, sdata, dev, type, type_data); 841 } 842 843 static const struct net_device_ops ieee80211_dataif_ops = { 844 .ndo_open = ieee80211_open, 845 .ndo_stop = ieee80211_stop, 846 .ndo_uninit = ieee80211_uninit, 847 .ndo_start_xmit = ieee80211_subif_start_xmit, 848 .ndo_set_rx_mode = ieee80211_set_multicast_list, 849 .ndo_set_mac_address = ieee80211_change_mac, 850 .ndo_setup_tc = ieee80211_netdev_setup_tc, 851 }; 852 ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)853 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 854 struct sk_buff *skb, 855 struct net_device *sb_dev) 856 { 857 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 858 struct ieee80211_local *local = sdata->local; 859 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 860 struct ieee80211_hdr *hdr; 861 int len_rthdr; 862 863 if (local->hw.queues < IEEE80211_NUM_ACS) 864 return 0; 865 866 /* reset flags and info before parsing radiotap header */ 867 memset(info, 0, sizeof(*info)); 868 869 if (!ieee80211_parse_tx_radiotap(skb, dev)) 870 return 0; /* doesn't matter, frame will be dropped */ 871 872 len_rthdr = ieee80211_get_radiotap_len(skb->data); 873 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 874 if (skb->len < len_rthdr + 2 || 875 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control)) 876 return 0; /* doesn't matter, frame will be dropped */ 877 878 return ieee80211_select_queue_80211(sdata, skb, hdr); 879 } 880 881 static const struct net_device_ops ieee80211_monitorif_ops = { 882 .ndo_open = ieee80211_open, 883 .ndo_stop = ieee80211_stop, 884 .ndo_uninit = ieee80211_uninit, 885 .ndo_start_xmit = ieee80211_monitor_start_xmit, 886 .ndo_set_rx_mode = ieee80211_set_multicast_list, 887 .ndo_set_mac_address = ieee80211_change_mac, 888 .ndo_select_queue = ieee80211_monitor_select_queue, 889 }; 890 ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)891 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx, 892 struct net_device_path *path) 893 { 894 struct ieee80211_sub_if_data *sdata; 895 struct ieee80211_local *local; 896 struct sta_info *sta; 897 int ret = -ENOENT; 898 899 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev); 900 local = sdata->local; 901 902 if (!local->ops->net_fill_forward_path) 903 return -EOPNOTSUPP; 904 905 rcu_read_lock(); 906 switch (sdata->vif.type) { 907 case NL80211_IFTYPE_AP_VLAN: 908 sta = rcu_dereference(sdata->u.vlan.sta); 909 if (sta) 910 break; 911 if (sdata->wdev.use_4addr) 912 goto out; 913 if (is_multicast_ether_addr(ctx->daddr)) 914 goto out; 915 sta = sta_info_get_bss(sdata, ctx->daddr); 916 break; 917 case NL80211_IFTYPE_AP: 918 if (is_multicast_ether_addr(ctx->daddr)) 919 goto out; 920 sta = sta_info_get(sdata, ctx->daddr); 921 break; 922 case NL80211_IFTYPE_STATION: 923 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 924 sta = sta_info_get(sdata, ctx->daddr); 925 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 926 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 927 goto out; 928 929 break; 930 } 931 } 932 933 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 934 break; 935 default: 936 goto out; 937 } 938 939 if (!sta) 940 goto out; 941 942 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path); 943 out: 944 rcu_read_unlock(); 945 946 return ret; 947 } 948 949 static const struct net_device_ops ieee80211_dataif_8023_ops = { 950 .ndo_open = ieee80211_open, 951 .ndo_stop = ieee80211_stop, 952 .ndo_uninit = ieee80211_uninit, 953 .ndo_start_xmit = ieee80211_subif_start_xmit_8023, 954 .ndo_set_rx_mode = ieee80211_set_multicast_list, 955 .ndo_set_mac_address = ieee80211_change_mac, 956 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, 957 .ndo_setup_tc = ieee80211_netdev_setup_tc, 958 }; 959 ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)960 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype) 961 { 962 switch (iftype) { 963 /* P2P GO and client are mapped to AP/STATION types */ 964 case NL80211_IFTYPE_AP: 965 case NL80211_IFTYPE_STATION: 966 return true; 967 default: 968 return false; 969 } 970 } 971 ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)972 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata) 973 { 974 struct ieee80211_local *local = sdata->local; 975 u32 flags; 976 977 flags = sdata->vif.offload_flags; 978 979 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) && 980 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 981 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED; 982 983 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) && 984 local->hw.wiphy->frag_threshold != (u32)-1) 985 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 986 987 if (local->monitors) 988 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 989 } else { 990 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED; 991 } 992 993 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) && 994 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) { 995 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED; 996 997 if (local->monitors && 998 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP)) 999 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1000 } else { 1001 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED; 1002 } 1003 1004 if (sdata->vif.offload_flags == flags) 1005 return false; 1006 1007 sdata->vif.offload_flags = flags; 1008 ieee80211_check_fast_rx_iface(sdata); 1009 return true; 1010 } 1011 ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)1012 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata) 1013 { 1014 struct ieee80211_local *local = sdata->local; 1015 struct ieee80211_sub_if_data *bss = sdata; 1016 bool enabled; 1017 1018 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1019 if (!sdata->bss) 1020 return; 1021 1022 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1023 } 1024 1025 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) || 1026 !ieee80211_iftype_supports_hdr_offload(bss->vif.type)) 1027 return; 1028 1029 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED; 1030 if (sdata->wdev.use_4addr && 1031 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR)) 1032 enabled = false; 1033 1034 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops : 1035 &ieee80211_dataif_ops; 1036 } 1037 ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)1038 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata) 1039 { 1040 struct ieee80211_local *local = sdata->local; 1041 struct ieee80211_sub_if_data *vsdata; 1042 1043 if (ieee80211_set_sdata_offload_flags(sdata)) { 1044 drv_update_vif_offload(local, sdata); 1045 ieee80211_set_vif_encap_ops(sdata); 1046 } 1047 1048 list_for_each_entry(vsdata, &local->interfaces, list) { 1049 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN || 1050 vsdata->bss != &sdata->u.ap) 1051 continue; 1052 1053 ieee80211_set_vif_encap_ops(vsdata); 1054 } 1055 } 1056 ieee80211_recalc_offload(struct ieee80211_local * local)1057 void ieee80211_recalc_offload(struct ieee80211_local *local) 1058 { 1059 struct ieee80211_sub_if_data *sdata; 1060 1061 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD)) 1062 return; 1063 1064 lockdep_assert_wiphy(local->hw.wiphy); 1065 1066 list_for_each_entry(sdata, &local->interfaces, list) { 1067 if (!ieee80211_sdata_running(sdata)) 1068 continue; 1069 1070 ieee80211_recalc_sdata_offload(sdata); 1071 } 1072 } 1073 ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1074 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 1075 const int offset) 1076 { 1077 struct ieee80211_local *local = sdata->local; 1078 u32 flags = sdata->u.mntr.flags; 1079 1080 #define ADJUST(_f, _s) do { \ 1081 if (flags & MONITOR_FLAG_##_f) \ 1082 local->fif_##_s += offset; \ 1083 } while (0) 1084 1085 ADJUST(FCSFAIL, fcsfail); 1086 ADJUST(PLCPFAIL, plcpfail); 1087 ADJUST(CONTROL, control); 1088 ADJUST(CONTROL, pspoll); 1089 ADJUST(OTHER_BSS, other_bss); 1090 1091 #undef ADJUST 1092 } 1093 ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1094 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 1095 { 1096 struct ieee80211_local *local = sdata->local; 1097 int i; 1098 1099 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1100 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1101 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 1102 else if (local->hw.queues >= IEEE80211_NUM_ACS) 1103 sdata->vif.hw_queue[i] = i; 1104 else 1105 sdata->vif.hw_queue[i] = 0; 1106 } 1107 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 1108 } 1109 ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1110 static void ieee80211_sdata_init(struct ieee80211_local *local, 1111 struct ieee80211_sub_if_data *sdata) 1112 { 1113 sdata->local = local; 1114 1115 /* 1116 * Initialize the default link, so we can use link_id 0 for non-MLD, 1117 * and that continues to work for non-MLD-aware drivers that use just 1118 * vif.bss_conf instead of vif.link_conf. 1119 * 1120 * Note that we never change this, so if link ID 0 isn't used in an 1121 * MLD connection, we get a separate allocation for it. 1122 */ 1123 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf); 1124 } 1125 ieee80211_add_virtual_monitor(struct ieee80211_local * local)1126 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 1127 { 1128 struct ieee80211_sub_if_data *sdata; 1129 int ret; 1130 1131 ASSERT_RTNL(); 1132 lockdep_assert_wiphy(local->hw.wiphy); 1133 1134 if (local->monitor_sdata) 1135 return 0; 1136 1137 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 1138 if (!sdata) 1139 return -ENOMEM; 1140 1141 /* set up data */ 1142 sdata->vif.type = NL80211_IFTYPE_MONITOR; 1143 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 1144 wiphy_name(local->hw.wiphy)); 1145 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 1146 sdata->wdev.wiphy = local->hw.wiphy; 1147 1148 ieee80211_sdata_init(local, sdata); 1149 1150 ieee80211_set_default_queues(sdata); 1151 1152 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1153 ret = drv_add_interface(local, sdata); 1154 if (WARN_ON(ret)) { 1155 /* ok .. stupid driver, it asked for this! */ 1156 kfree(sdata); 1157 return ret; 1158 } 1159 } 1160 1161 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1162 1163 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 1164 if (ret) { 1165 kfree(sdata); 1166 return ret; 1167 } 1168 1169 mutex_lock(&local->iflist_mtx); 1170 rcu_assign_pointer(local->monitor_sdata, sdata); 1171 mutex_unlock(&local->iflist_mtx); 1172 1173 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq, 1174 IEEE80211_CHANCTX_EXCLUSIVE); 1175 if (ret) { 1176 mutex_lock(&local->iflist_mtx); 1177 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1178 mutex_unlock(&local->iflist_mtx); 1179 synchronize_net(); 1180 drv_remove_interface(local, sdata); 1181 kfree(sdata); 1182 return ret; 1183 } 1184 1185 skb_queue_head_init(&sdata->skb_queue); 1186 skb_queue_head_init(&sdata->status_queue); 1187 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1188 1189 return 0; 1190 } 1191 ieee80211_del_virtual_monitor(struct ieee80211_local * local)1192 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 1193 { 1194 struct ieee80211_sub_if_data *sdata; 1195 1196 ASSERT_RTNL(); 1197 lockdep_assert_wiphy(local->hw.wiphy); 1198 1199 mutex_lock(&local->iflist_mtx); 1200 1201 sdata = rcu_dereference_protected(local->monitor_sdata, 1202 lockdep_is_held(&local->iflist_mtx)); 1203 if (!sdata) { 1204 mutex_unlock(&local->iflist_mtx); 1205 return; 1206 } 1207 1208 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1209 mutex_unlock(&local->iflist_mtx); 1210 1211 synchronize_net(); 1212 1213 ieee80211_link_release_channel(&sdata->deflink); 1214 1215 if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 1216 drv_remove_interface(local, sdata); 1217 1218 kfree(sdata); 1219 } 1220 1221 /* 1222 * NOTE: Be very careful when changing this function, it must NOT return 1223 * an error on interface type changes that have been pre-checked, so most 1224 * checks should be in ieee80211_check_concurrent_iface. 1225 */ ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1226 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 1227 { 1228 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 1229 struct net_device *dev = wdev->netdev; 1230 struct ieee80211_local *local = sdata->local; 1231 u64 changed = 0; 1232 int res; 1233 u32 hw_reconf_flags = 0; 1234 1235 lockdep_assert_wiphy(local->hw.wiphy); 1236 1237 switch (sdata->vif.type) { 1238 case NL80211_IFTYPE_AP_VLAN: { 1239 struct ieee80211_sub_if_data *master; 1240 1241 if (!sdata->bss) 1242 return -ENOLINK; 1243 1244 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 1245 1246 master = container_of(sdata->bss, 1247 struct ieee80211_sub_if_data, u.ap); 1248 sdata->control_port_protocol = 1249 master->control_port_protocol; 1250 sdata->control_port_no_encrypt = 1251 master->control_port_no_encrypt; 1252 sdata->control_port_over_nl80211 = 1253 master->control_port_over_nl80211; 1254 sdata->control_port_no_preauth = 1255 master->control_port_no_preauth; 1256 sdata->vif.cab_queue = master->vif.cab_queue; 1257 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 1258 sizeof(sdata->vif.hw_queue)); 1259 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq; 1260 1261 sdata->crypto_tx_tailroom_needed_cnt += 1262 master->crypto_tx_tailroom_needed_cnt; 1263 1264 break; 1265 } 1266 case NL80211_IFTYPE_AP: 1267 sdata->bss = &sdata->u.ap; 1268 break; 1269 case NL80211_IFTYPE_MESH_POINT: 1270 case NL80211_IFTYPE_STATION: 1271 case NL80211_IFTYPE_MONITOR: 1272 case NL80211_IFTYPE_ADHOC: 1273 case NL80211_IFTYPE_P2P_DEVICE: 1274 case NL80211_IFTYPE_OCB: 1275 case NL80211_IFTYPE_NAN: 1276 /* no special treatment */ 1277 break; 1278 case NL80211_IFTYPE_UNSPECIFIED: 1279 case NUM_NL80211_IFTYPES: 1280 case NL80211_IFTYPE_P2P_CLIENT: 1281 case NL80211_IFTYPE_P2P_GO: 1282 case NL80211_IFTYPE_WDS: 1283 /* cannot happen */ 1284 WARN_ON(1); 1285 break; 1286 } 1287 1288 if (local->open_count == 0) { 1289 /* here we can consider everything in good order (again) */ 1290 local->reconfig_failure = false; 1291 1292 res = drv_start(local); 1293 if (res) 1294 goto err_del_bss; 1295 ieee80211_led_radio(local, true); 1296 ieee80211_mod_tpt_led_trig(local, 1297 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1298 } 1299 1300 /* 1301 * Copy the hopefully now-present MAC address to 1302 * this interface, if it has the special null one. 1303 */ 1304 if (dev && is_zero_ether_addr(dev->dev_addr)) { 1305 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr); 1306 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 1307 1308 if (!is_valid_ether_addr(dev->dev_addr)) { 1309 res = -EADDRNOTAVAIL; 1310 goto err_stop; 1311 } 1312 } 1313 1314 switch (sdata->vif.type) { 1315 case NL80211_IFTYPE_AP_VLAN: 1316 /* no need to tell driver, but set carrier and chanctx */ 1317 if (sdata->bss->active) { 1318 ieee80211_link_vlan_copy_chanctx(&sdata->deflink); 1319 netif_carrier_on(dev); 1320 ieee80211_set_vif_encap_ops(sdata); 1321 } else { 1322 netif_carrier_off(dev); 1323 } 1324 break; 1325 case NL80211_IFTYPE_MONITOR: 1326 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 1327 local->cooked_mntrs++; 1328 break; 1329 } 1330 1331 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1332 res = drv_add_interface(local, sdata); 1333 if (res) 1334 goto err_stop; 1335 } else if (local->monitors == 0 && local->open_count == 0) { 1336 res = ieee80211_add_virtual_monitor(local); 1337 if (res) 1338 goto err_stop; 1339 } 1340 1341 /* must be before the call to ieee80211_configure_filter */ 1342 local->monitors++; 1343 if (local->monitors == 1) { 1344 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 1345 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 1346 } 1347 1348 ieee80211_adjust_monitor_flags(sdata, 1); 1349 ieee80211_configure_filter(local); 1350 ieee80211_recalc_offload(local); 1351 ieee80211_recalc_idle(local); 1352 1353 netif_carrier_on(dev); 1354 break; 1355 default: 1356 if (coming_up) { 1357 ieee80211_del_virtual_monitor(local); 1358 ieee80211_set_sdata_offload_flags(sdata); 1359 1360 res = drv_add_interface(local, sdata); 1361 if (res) 1362 goto err_stop; 1363 1364 ieee80211_set_vif_encap_ops(sdata); 1365 res = ieee80211_check_queues(sdata, 1366 ieee80211_vif_type_p2p(&sdata->vif)); 1367 if (res) 1368 goto err_del_interface; 1369 } 1370 1371 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1372 local->fif_pspoll++; 1373 local->fif_probe_req++; 1374 1375 ieee80211_configure_filter(local); 1376 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1377 local->fif_probe_req++; 1378 } 1379 1380 if (sdata->vif.probe_req_reg) 1381 drv_config_iface_filter(local, sdata, 1382 FIF_PROBE_REQ, 1383 FIF_PROBE_REQ); 1384 1385 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 1386 sdata->vif.type != NL80211_IFTYPE_NAN) 1387 changed |= ieee80211_reset_erp_info(sdata); 1388 ieee80211_link_info_change_notify(sdata, &sdata->deflink, 1389 changed); 1390 1391 switch (sdata->vif.type) { 1392 case NL80211_IFTYPE_STATION: 1393 case NL80211_IFTYPE_ADHOC: 1394 case NL80211_IFTYPE_AP: 1395 case NL80211_IFTYPE_MESH_POINT: 1396 case NL80211_IFTYPE_OCB: 1397 netif_carrier_off(dev); 1398 break; 1399 case NL80211_IFTYPE_P2P_DEVICE: 1400 case NL80211_IFTYPE_NAN: 1401 break; 1402 default: 1403 /* not reached */ 1404 WARN_ON(1); 1405 } 1406 1407 /* 1408 * Set default queue parameters so drivers don't 1409 * need to initialise the hardware if the hardware 1410 * doesn't start up with sane defaults. 1411 * Enable QoS for anything but station interfaces. 1412 */ 1413 ieee80211_set_wmm_default(&sdata->deflink, true, 1414 sdata->vif.type != NL80211_IFTYPE_STATION); 1415 } 1416 1417 switch (sdata->vif.type) { 1418 case NL80211_IFTYPE_P2P_DEVICE: 1419 rcu_assign_pointer(local->p2p_sdata, sdata); 1420 break; 1421 case NL80211_IFTYPE_MONITOR: 1422 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) 1423 break; 1424 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list); 1425 break; 1426 default: 1427 break; 1428 } 1429 1430 /* 1431 * set_multicast_list will be invoked by the networking core 1432 * which will check whether any increments here were done in 1433 * error and sync them down to the hardware as filter flags. 1434 */ 1435 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 1436 atomic_inc(&local->iff_allmultis); 1437 1438 if (coming_up) 1439 local->open_count++; 1440 1441 if (local->open_count == 1) 1442 ieee80211_hw_conf_init(local); 1443 else if (hw_reconf_flags) 1444 ieee80211_hw_config(local, hw_reconf_flags); 1445 1446 ieee80211_recalc_ps(local); 1447 1448 set_bit(SDATA_STATE_RUNNING, &sdata->state); 1449 1450 return 0; 1451 err_del_interface: 1452 drv_remove_interface(local, sdata); 1453 err_stop: 1454 if (!local->open_count) 1455 drv_stop(local, false); 1456 err_del_bss: 1457 sdata->bss = NULL; 1458 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1459 list_del(&sdata->u.vlan.list); 1460 /* might already be clear but that doesn't matter */ 1461 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 1462 return res; 1463 } 1464 ieee80211_if_setup(struct net_device * dev)1465 static void ieee80211_if_setup(struct net_device *dev) 1466 { 1467 ether_setup(dev); 1468 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1469 dev->priv_flags |= IFF_NO_QUEUE; 1470 dev->netdev_ops = &ieee80211_dataif_ops; 1471 dev->needs_free_netdev = true; 1472 } 1473 ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1474 static void ieee80211_iface_process_skb(struct ieee80211_local *local, 1475 struct ieee80211_sub_if_data *sdata, 1476 struct sk_buff *skb) 1477 { 1478 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1479 1480 lockdep_assert_wiphy(local->hw.wiphy); 1481 1482 if (ieee80211_is_action(mgmt->frame_control) && 1483 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1484 struct sta_info *sta; 1485 int len = skb->len; 1486 1487 sta = sta_info_get_bss(sdata, mgmt->sa); 1488 if (sta) { 1489 switch (mgmt->u.action.u.addba_req.action_code) { 1490 case WLAN_ACTION_ADDBA_REQ: 1491 ieee80211_process_addba_request(local, sta, 1492 mgmt, len); 1493 break; 1494 case WLAN_ACTION_ADDBA_RESP: 1495 ieee80211_process_addba_resp(local, sta, 1496 mgmt, len); 1497 break; 1498 case WLAN_ACTION_DELBA: 1499 ieee80211_process_delba(sdata, sta, 1500 mgmt, len); 1501 break; 1502 default: 1503 WARN_ON(1); 1504 break; 1505 } 1506 } 1507 } else if (ieee80211_is_action(mgmt->frame_control) && 1508 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1509 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1510 case WLAN_VHT_ACTION_OPMODE_NOTIF: { 1511 struct ieee80211_rx_status *status; 1512 enum nl80211_band band; 1513 struct sta_info *sta; 1514 u8 opmode; 1515 1516 status = IEEE80211_SKB_RXCB(skb); 1517 band = status->band; 1518 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1519 1520 sta = sta_info_get_bss(sdata, mgmt->sa); 1521 1522 if (sta) 1523 ieee80211_vht_handle_opmode(sdata, 1524 &sta->deflink, 1525 opmode, band); 1526 1527 break; 1528 } 1529 case WLAN_VHT_ACTION_GROUPID_MGMT: 1530 ieee80211_process_mu_groups(sdata, &sdata->deflink, 1531 mgmt); 1532 break; 1533 default: 1534 WARN_ON(1); 1535 break; 1536 } 1537 } else if (ieee80211_is_action(mgmt->frame_control) && 1538 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1539 switch (mgmt->u.action.u.s1g.action_code) { 1540 case WLAN_S1G_TWT_TEARDOWN: 1541 case WLAN_S1G_TWT_SETUP: 1542 ieee80211_s1g_rx_twt_action(sdata, skb); 1543 break; 1544 default: 1545 break; 1546 } 1547 } else if (ieee80211_is_action(mgmt->frame_control) && 1548 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) { 1549 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1550 switch (mgmt->u.action.u.ttlm_req.action_code) { 1551 case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ: 1552 ieee80211_process_neg_ttlm_req(sdata, mgmt, 1553 skb->len); 1554 break; 1555 case WLAN_PROTECTED_EHT_ACTION_TTLM_RES: 1556 ieee80211_process_neg_ttlm_res(sdata, mgmt, 1557 skb->len); 1558 break; 1559 default: 1560 break; 1561 } 1562 } 1563 } else if (ieee80211_is_ext(mgmt->frame_control)) { 1564 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1565 ieee80211_sta_rx_queued_ext(sdata, skb); 1566 else 1567 WARN_ON(1); 1568 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1569 struct ieee80211_hdr *hdr = (void *)mgmt; 1570 struct sta_info *sta; 1571 1572 /* 1573 * So the frame isn't mgmt, but frame_control 1574 * is at the right place anyway, of course, so 1575 * the if statement is correct. 1576 * 1577 * Warn if we have other data frame types here, 1578 * they must not get here. 1579 */ 1580 WARN_ON(hdr->frame_control & 1581 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1582 WARN_ON(!(hdr->seq_ctrl & 1583 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1584 /* 1585 * This was a fragment of a frame, received while 1586 * a block-ack session was active. That cannot be 1587 * right, so terminate the session. 1588 */ 1589 sta = sta_info_get_bss(sdata, mgmt->sa); 1590 if (sta) { 1591 u16 tid = ieee80211_get_tid(hdr); 1592 1593 __ieee80211_stop_rx_ba_session( 1594 sta, tid, WLAN_BACK_RECIPIENT, 1595 WLAN_REASON_QSTA_REQUIRE_SETUP, 1596 true); 1597 } 1598 } else switch (sdata->vif.type) { 1599 case NL80211_IFTYPE_STATION: 1600 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1601 break; 1602 case NL80211_IFTYPE_ADHOC: 1603 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1604 break; 1605 case NL80211_IFTYPE_MESH_POINT: 1606 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1607 break; 1608 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1609 break; 1610 default: 1611 WARN(1, "frame for unexpected interface type"); 1612 break; 1613 } 1614 } 1615 ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1616 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata, 1617 struct sk_buff *skb) 1618 { 1619 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1620 1621 if (ieee80211_is_action(mgmt->frame_control) && 1622 mgmt->u.action.category == WLAN_CATEGORY_S1G) { 1623 switch (mgmt->u.action.u.s1g.action_code) { 1624 case WLAN_S1G_TWT_TEARDOWN: 1625 case WLAN_S1G_TWT_SETUP: 1626 ieee80211_s1g_status_twt_action(sdata, skb); 1627 break; 1628 default: 1629 break; 1630 } 1631 } 1632 } 1633 ieee80211_iface_work(struct wiphy * wiphy,struct wiphy_work * work)1634 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work) 1635 { 1636 struct ieee80211_sub_if_data *sdata = 1637 container_of(work, struct ieee80211_sub_if_data, work); 1638 struct ieee80211_local *local = sdata->local; 1639 struct sk_buff *skb; 1640 1641 if (!ieee80211_sdata_running(sdata)) 1642 return; 1643 1644 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1645 return; 1646 1647 if (!ieee80211_can_run_worker(local)) 1648 return; 1649 1650 /* first process frames */ 1651 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1652 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1653 1654 if (skb->protocol == cpu_to_be16(ETH_P_TDLS)) 1655 ieee80211_process_tdls_channel_switch(sdata, skb); 1656 else 1657 ieee80211_iface_process_skb(local, sdata, skb); 1658 1659 kfree_skb(skb); 1660 kcov_remote_stop(); 1661 } 1662 1663 /* process status queue */ 1664 while ((skb = skb_dequeue(&sdata->status_queue))) { 1665 kcov_remote_start_common(skb_get_kcov_handle(skb)); 1666 1667 ieee80211_iface_process_status(sdata, skb); 1668 kfree_skb(skb); 1669 1670 kcov_remote_stop(); 1671 } 1672 1673 /* then other type-dependent work */ 1674 switch (sdata->vif.type) { 1675 case NL80211_IFTYPE_STATION: 1676 ieee80211_sta_work(sdata); 1677 break; 1678 case NL80211_IFTYPE_ADHOC: 1679 ieee80211_ibss_work(sdata); 1680 break; 1681 case NL80211_IFTYPE_MESH_POINT: 1682 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1683 break; 1684 ieee80211_mesh_work(sdata); 1685 break; 1686 case NL80211_IFTYPE_OCB: 1687 ieee80211_ocb_work(sdata); 1688 break; 1689 default: 1690 break; 1691 } 1692 } 1693 ieee80211_activate_links_work(struct wiphy * wiphy,struct wiphy_work * work)1694 static void ieee80211_activate_links_work(struct wiphy *wiphy, 1695 struct wiphy_work *work) 1696 { 1697 struct ieee80211_sub_if_data *sdata = 1698 container_of(work, struct ieee80211_sub_if_data, 1699 activate_links_work); 1700 struct ieee80211_local *local = wiphy_priv(wiphy); 1701 1702 if (local->in_reconfig) 1703 return; 1704 1705 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links); 1706 sdata->desired_active_links = 0; 1707 } 1708 1709 /* 1710 * Helper function to initialise an interface to a specific type. 1711 */ ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1712 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1713 enum nl80211_iftype type) 1714 { 1715 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1716 0xff, 0xff, 0xff}; 1717 1718 /* clear type-dependent unions */ 1719 memset(&sdata->u, 0, sizeof(sdata->u)); 1720 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u)); 1721 1722 /* and set some type-dependent values */ 1723 sdata->vif.type = type; 1724 sdata->vif.p2p = false; 1725 sdata->wdev.iftype = type; 1726 1727 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1728 sdata->control_port_no_encrypt = false; 1729 sdata->control_port_over_nl80211 = false; 1730 sdata->control_port_no_preauth = false; 1731 sdata->vif.cfg.idle = true; 1732 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */ 1733 1734 sdata->noack_map = 0; 1735 1736 /* only monitor/p2p-device differ */ 1737 if (sdata->dev) { 1738 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1739 sdata->dev->type = ARPHRD_ETHER; 1740 } 1741 1742 skb_queue_head_init(&sdata->skb_queue); 1743 skb_queue_head_init(&sdata->status_queue); 1744 wiphy_work_init(&sdata->work, ieee80211_iface_work); 1745 wiphy_work_init(&sdata->activate_links_work, 1746 ieee80211_activate_links_work); 1747 1748 switch (type) { 1749 case NL80211_IFTYPE_P2P_GO: 1750 type = NL80211_IFTYPE_AP; 1751 sdata->vif.type = type; 1752 sdata->vif.p2p = true; 1753 fallthrough; 1754 case NL80211_IFTYPE_AP: 1755 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1756 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1757 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1758 break; 1759 case NL80211_IFTYPE_P2P_CLIENT: 1760 type = NL80211_IFTYPE_STATION; 1761 sdata->vif.type = type; 1762 sdata->vif.p2p = true; 1763 fallthrough; 1764 case NL80211_IFTYPE_STATION: 1765 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid; 1766 ieee80211_sta_setup_sdata(sdata); 1767 break; 1768 case NL80211_IFTYPE_OCB: 1769 sdata->vif.bss_conf.bssid = bssid_wildcard; 1770 ieee80211_ocb_setup_sdata(sdata); 1771 break; 1772 case NL80211_IFTYPE_ADHOC: 1773 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1774 ieee80211_ibss_setup_sdata(sdata); 1775 break; 1776 case NL80211_IFTYPE_MESH_POINT: 1777 if (ieee80211_vif_is_mesh(&sdata->vif)) 1778 ieee80211_mesh_init_sdata(sdata); 1779 break; 1780 case NL80211_IFTYPE_MONITOR: 1781 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1782 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1783 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1784 MONITOR_FLAG_OTHER_BSS; 1785 break; 1786 case NL80211_IFTYPE_NAN: 1787 idr_init(&sdata->u.nan.function_inst_ids); 1788 spin_lock_init(&sdata->u.nan.func_lock); 1789 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1790 break; 1791 case NL80211_IFTYPE_AP_VLAN: 1792 case NL80211_IFTYPE_P2P_DEVICE: 1793 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1794 break; 1795 case NL80211_IFTYPE_UNSPECIFIED: 1796 case NL80211_IFTYPE_WDS: 1797 case NUM_NL80211_IFTYPES: 1798 WARN_ON(1); 1799 break; 1800 } 1801 1802 /* need to do this after the switch so vif.type is correct */ 1803 ieee80211_link_setup(&sdata->deflink); 1804 1805 ieee80211_debugfs_recreate_netdev(sdata, false); 1806 } 1807 ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1808 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1809 enum nl80211_iftype type) 1810 { 1811 struct ieee80211_local *local = sdata->local; 1812 int ret, err; 1813 enum nl80211_iftype internal_type = type; 1814 bool p2p = false; 1815 1816 ASSERT_RTNL(); 1817 1818 if (!local->ops->change_interface) 1819 return -EBUSY; 1820 1821 /* for now, don't support changing while links exist */ 1822 if (ieee80211_vif_is_mld(&sdata->vif)) 1823 return -EBUSY; 1824 1825 switch (sdata->vif.type) { 1826 case NL80211_IFTYPE_AP: 1827 if (!list_empty(&sdata->u.ap.vlans)) 1828 return -EBUSY; 1829 break; 1830 case NL80211_IFTYPE_STATION: 1831 case NL80211_IFTYPE_ADHOC: 1832 case NL80211_IFTYPE_OCB: 1833 /* 1834 * Could maybe also all others here? 1835 * Just not sure how that interacts 1836 * with the RX/config path e.g. for 1837 * mesh. 1838 */ 1839 break; 1840 default: 1841 return -EBUSY; 1842 } 1843 1844 switch (type) { 1845 case NL80211_IFTYPE_AP: 1846 case NL80211_IFTYPE_STATION: 1847 case NL80211_IFTYPE_ADHOC: 1848 case NL80211_IFTYPE_OCB: 1849 /* 1850 * Could probably support everything 1851 * but here. 1852 */ 1853 break; 1854 case NL80211_IFTYPE_P2P_CLIENT: 1855 p2p = true; 1856 internal_type = NL80211_IFTYPE_STATION; 1857 break; 1858 case NL80211_IFTYPE_P2P_GO: 1859 p2p = true; 1860 internal_type = NL80211_IFTYPE_AP; 1861 break; 1862 default: 1863 return -EBUSY; 1864 } 1865 1866 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1867 if (ret) 1868 return ret; 1869 1870 ieee80211_stop_vif_queues(local, sdata, 1871 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1872 /* do_stop will synchronize_rcu() first thing */ 1873 ieee80211_do_stop(sdata, false); 1874 1875 ieee80211_teardown_sdata(sdata); 1876 1877 ieee80211_set_sdata_offload_flags(sdata); 1878 ret = drv_change_interface(local, sdata, internal_type, p2p); 1879 if (ret) 1880 type = ieee80211_vif_type_p2p(&sdata->vif); 1881 1882 /* 1883 * Ignore return value here, there's not much we can do since 1884 * the driver changed the interface type internally already. 1885 * The warnings will hopefully make driver authors fix it :-) 1886 */ 1887 ieee80211_check_queues(sdata, type); 1888 1889 ieee80211_setup_sdata(sdata, type); 1890 ieee80211_set_vif_encap_ops(sdata); 1891 1892 err = ieee80211_do_open(&sdata->wdev, false); 1893 WARN(err, "type change: do_open returned %d", err); 1894 1895 ieee80211_wake_vif_queues(local, sdata, 1896 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE); 1897 return ret; 1898 } 1899 ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1900 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1901 enum nl80211_iftype type) 1902 { 1903 int ret; 1904 1905 ASSERT_RTNL(); 1906 1907 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1908 return 0; 1909 1910 if (ieee80211_sdata_running(sdata)) { 1911 ret = ieee80211_runtime_change_iftype(sdata, type); 1912 if (ret) 1913 return ret; 1914 } else { 1915 /* Purge and reset type-dependent state. */ 1916 ieee80211_teardown_sdata(sdata); 1917 ieee80211_setup_sdata(sdata, type); 1918 } 1919 1920 /* reset some values that shouldn't be kept across type changes */ 1921 if (type == NL80211_IFTYPE_STATION) 1922 sdata->u.mgd.use_4addr = false; 1923 1924 return 0; 1925 } 1926 ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1927 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1928 u8 *perm_addr, enum nl80211_iftype type) 1929 { 1930 struct ieee80211_sub_if_data *sdata; 1931 u64 mask, start, addr, val, inc; 1932 u8 *m; 1933 u8 tmp_addr[ETH_ALEN]; 1934 int i; 1935 1936 lockdep_assert_wiphy(local->hw.wiphy); 1937 1938 /* default ... something at least */ 1939 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1940 1941 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1942 local->hw.wiphy->n_addresses <= 1) 1943 return; 1944 1945 switch (type) { 1946 case NL80211_IFTYPE_MONITOR: 1947 /* doesn't matter */ 1948 break; 1949 case NL80211_IFTYPE_AP_VLAN: 1950 /* match up with an AP interface */ 1951 list_for_each_entry(sdata, &local->interfaces, list) { 1952 if (sdata->vif.type != NL80211_IFTYPE_AP) 1953 continue; 1954 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1955 break; 1956 } 1957 /* keep default if no AP interface present */ 1958 break; 1959 case NL80211_IFTYPE_P2P_CLIENT: 1960 case NL80211_IFTYPE_P2P_GO: 1961 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1962 list_for_each_entry(sdata, &local->interfaces, list) { 1963 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1964 continue; 1965 if (!ieee80211_sdata_running(sdata)) 1966 continue; 1967 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1968 return; 1969 } 1970 } 1971 fallthrough; 1972 default: 1973 /* assign a new address if possible -- try n_addresses first */ 1974 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1975 bool used = false; 1976 1977 list_for_each_entry(sdata, &local->interfaces, list) { 1978 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1979 sdata->vif.addr)) { 1980 used = true; 1981 break; 1982 } 1983 } 1984 1985 if (!used) { 1986 memcpy(perm_addr, 1987 local->hw.wiphy->addresses[i].addr, 1988 ETH_ALEN); 1989 break; 1990 } 1991 } 1992 1993 /* try mask if available */ 1994 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1995 break; 1996 1997 m = local->hw.wiphy->addr_mask; 1998 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1999 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2000 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2001 2002 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 2003 /* not a contiguous mask ... not handled now! */ 2004 pr_info("not contiguous\n"); 2005 break; 2006 } 2007 2008 /* 2009 * Pick address of existing interface in case user changed 2010 * MAC address manually, default to perm_addr. 2011 */ 2012 m = local->hw.wiphy->perm_addr; 2013 list_for_each_entry(sdata, &local->interfaces, list) { 2014 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 2015 continue; 2016 m = sdata->vif.addr; 2017 break; 2018 } 2019 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 2020 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 2021 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 2022 2023 inc = 1ULL<<__ffs64(mask); 2024 val = (start & mask); 2025 addr = (start & ~mask) | (val & mask); 2026 do { 2027 bool used = false; 2028 2029 tmp_addr[5] = addr >> 0*8; 2030 tmp_addr[4] = addr >> 1*8; 2031 tmp_addr[3] = addr >> 2*8; 2032 tmp_addr[2] = addr >> 3*8; 2033 tmp_addr[1] = addr >> 4*8; 2034 tmp_addr[0] = addr >> 5*8; 2035 2036 val += inc; 2037 2038 list_for_each_entry(sdata, &local->interfaces, list) { 2039 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 2040 used = true; 2041 break; 2042 } 2043 } 2044 2045 if (!used) { 2046 memcpy(perm_addr, tmp_addr, ETH_ALEN); 2047 break; 2048 } 2049 addr = (start & ~mask) | (val & mask); 2050 } while (addr != start); 2051 2052 break; 2053 } 2054 } 2055 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)2056 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 2057 unsigned char name_assign_type, 2058 struct wireless_dev **new_wdev, enum nl80211_iftype type, 2059 struct vif_params *params) 2060 { 2061 struct net_device *ndev = NULL; 2062 struct ieee80211_sub_if_data *sdata = NULL; 2063 struct txq_info *txqi; 2064 int ret, i; 2065 2066 ASSERT_RTNL(); 2067 lockdep_assert_wiphy(local->hw.wiphy); 2068 2069 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 2070 struct wireless_dev *wdev; 2071 2072 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 2073 GFP_KERNEL); 2074 if (!sdata) 2075 return -ENOMEM; 2076 wdev = &sdata->wdev; 2077 2078 sdata->dev = NULL; 2079 strscpy(sdata->name, name, IFNAMSIZ); 2080 ieee80211_assign_perm_addr(local, wdev->address, type); 2081 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 2082 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2083 } else { 2084 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 2085 sizeof(void *)); 2086 int txq_size = 0; 2087 2088 if (type != NL80211_IFTYPE_AP_VLAN && 2089 (type != NL80211_IFTYPE_MONITOR || 2090 (params->flags & MONITOR_FLAG_ACTIVE))) 2091 txq_size += sizeof(struct txq_info) + 2092 local->hw.txq_data_size; 2093 2094 ndev = alloc_netdev_mqs(size + txq_size, 2095 name, name_assign_type, 2096 ieee80211_if_setup, 1, 1); 2097 if (!ndev) 2098 return -ENOMEM; 2099 2100 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 2101 2102 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 2103 2104 ndev->needed_headroom = local->tx_headroom + 2105 4*6 /* four MAC addresses */ 2106 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 2107 + 6 /* mesh */ 2108 + 8 /* rfc1042/bridge tunnel */ 2109 - ETH_HLEN /* ethernet hard_header_len */ 2110 + IEEE80211_ENCRYPT_HEADROOM; 2111 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 2112 2113 ret = dev_alloc_name(ndev, ndev->name); 2114 if (ret < 0) { 2115 free_netdev(ndev); 2116 return ret; 2117 } 2118 2119 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 2120 if (is_valid_ether_addr(params->macaddr)) 2121 eth_hw_addr_set(ndev, params->macaddr); 2122 else 2123 eth_hw_addr_set(ndev, ndev->perm_addr); 2124 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 2125 2126 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 2127 sdata = netdev_priv(ndev); 2128 ndev->ieee80211_ptr = &sdata->wdev; 2129 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 2130 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr); 2131 memcpy(sdata->name, ndev->name, IFNAMSIZ); 2132 2133 if (txq_size) { 2134 txqi = netdev_priv(ndev) + size; 2135 ieee80211_txq_init(sdata, NULL, txqi, 0); 2136 } 2137 2138 sdata->dev = ndev; 2139 } 2140 2141 /* initialise type-independent data */ 2142 sdata->wdev.wiphy = local->hw.wiphy; 2143 2144 ieee80211_sdata_init(local, sdata); 2145 2146 ieee80211_init_frag_cache(&sdata->frags); 2147 2148 INIT_LIST_HEAD(&sdata->key_list); 2149 2150 wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk, 2151 ieee80211_delayed_tailroom_dec); 2152 2153 for (i = 0; i < NUM_NL80211_BANDS; i++) { 2154 struct ieee80211_supported_band *sband; 2155 sband = local->hw.wiphy->bands[i]; 2156 sdata->rc_rateidx_mask[i] = 2157 sband ? (1 << sband->n_bitrates) - 1 : 0; 2158 if (sband) { 2159 __le16 cap; 2160 u16 *vht_rate_mask; 2161 2162 memcpy(sdata->rc_rateidx_mcs_mask[i], 2163 sband->ht_cap.mcs.rx_mask, 2164 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2165 2166 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 2167 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 2168 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 2169 } else { 2170 memset(sdata->rc_rateidx_mcs_mask[i], 0, 2171 sizeof(sdata->rc_rateidx_mcs_mask[i])); 2172 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 2173 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 2174 } 2175 } 2176 2177 ieee80211_set_default_queues(sdata); 2178 2179 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2180 sdata->deflink.user_power_level = local->user_power_level; 2181 2182 /* setup type-dependent data */ 2183 ieee80211_setup_sdata(sdata, type); 2184 2185 if (ndev) { 2186 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 2187 if (type == NL80211_IFTYPE_STATION) 2188 sdata->u.mgd.use_4addr = params->use_4addr; 2189 2190 ndev->features |= local->hw.netdev_features; 2191 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 2192 ndev->hw_features |= ndev->features & 2193 MAC80211_SUPPORTED_FEATURES_TX; 2194 sdata->vif.netdev_features = local->hw.netdev_features; 2195 2196 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 2197 2198 /* MTU range is normally 256 - 2304, where the upper limit is 2199 * the maximum MSDU size. Monitor interfaces send and receive 2200 * MPDU and A-MSDU frames which may be much larger so we do 2201 * not impose an upper limit in that case. 2202 */ 2203 ndev->min_mtu = 256; 2204 if (type == NL80211_IFTYPE_MONITOR) 2205 ndev->max_mtu = 0; 2206 else 2207 ndev->max_mtu = local->hw.max_mtu; 2208 2209 ret = cfg80211_register_netdevice(ndev); 2210 if (ret) { 2211 free_netdev(ndev); 2212 return ret; 2213 } 2214 } 2215 2216 mutex_lock(&local->iflist_mtx); 2217 list_add_tail_rcu(&sdata->list, &local->interfaces); 2218 mutex_unlock(&local->iflist_mtx); 2219 2220 if (new_wdev) 2221 *new_wdev = &sdata->wdev; 2222 2223 return 0; 2224 } 2225 ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2226 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 2227 { 2228 ASSERT_RTNL(); 2229 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2230 2231 mutex_lock(&sdata->local->iflist_mtx); 2232 list_del_rcu(&sdata->list); 2233 mutex_unlock(&sdata->local->iflist_mtx); 2234 2235 if (sdata->vif.txq) 2236 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); 2237 2238 synchronize_rcu(); 2239 2240 cfg80211_unregister_wdev(&sdata->wdev); 2241 2242 if (!sdata->dev) { 2243 ieee80211_teardown_sdata(sdata); 2244 kfree(sdata); 2245 } 2246 } 2247 ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2248 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 2249 { 2250 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 2251 return; 2252 ieee80211_do_stop(sdata, true); 2253 } 2254 ieee80211_remove_interfaces(struct ieee80211_local * local)2255 void ieee80211_remove_interfaces(struct ieee80211_local *local) 2256 { 2257 struct ieee80211_sub_if_data *sdata, *tmp; 2258 LIST_HEAD(unreg_list); 2259 2260 ASSERT_RTNL(); 2261 2262 /* Before destroying the interfaces, make sure they're all stopped so 2263 * that the hardware is stopped. Otherwise, the driver might still be 2264 * iterating the interfaces during the shutdown, e.g. from a worker 2265 * or from RX processing or similar, and if it does so (using atomic 2266 * iteration) while we're manipulating the list, the iteration will 2267 * crash. 2268 * 2269 * After this, the hardware should be stopped and the driver should 2270 * have stopped all of its activities, so that we can do RCU-unaware 2271 * manipulations of the interface list below. 2272 */ 2273 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 2274 2275 wiphy_lock(local->hw.wiphy); 2276 2277 WARN(local->open_count, "%s: open count remains %d\n", 2278 wiphy_name(local->hw.wiphy), local->open_count); 2279 2280 mutex_lock(&local->iflist_mtx); 2281 list_splice_init(&local->interfaces, &unreg_list); 2282 mutex_unlock(&local->iflist_mtx); 2283 2284 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) { 2285 bool netdev = sdata->dev; 2286 2287 /* 2288 * Remove IP addresses explicitly, since the notifier will 2289 * skip the callbacks if wdev->registered is false, since 2290 * we can't acquire the wiphy_lock() again there if already 2291 * inside this locked section. 2292 */ 2293 sdata->vif.cfg.arp_addr_cnt = 0; 2294 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2295 sdata->u.mgd.associated) 2296 ieee80211_vif_cfg_change_notify(sdata, 2297 BSS_CHANGED_ARP_FILTER); 2298 2299 list_del(&sdata->list); 2300 cfg80211_unregister_wdev(&sdata->wdev); 2301 2302 if (!netdev) 2303 kfree(sdata); 2304 } 2305 wiphy_unlock(local->hw.wiphy); 2306 } 2307 netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2308 static int netdev_notify(struct notifier_block *nb, 2309 unsigned long state, void *ptr) 2310 { 2311 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2312 struct ieee80211_sub_if_data *sdata; 2313 2314 if (state != NETDEV_CHANGENAME) 2315 return NOTIFY_DONE; 2316 2317 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 2318 return NOTIFY_DONE; 2319 2320 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 2321 return NOTIFY_DONE; 2322 2323 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2324 memcpy(sdata->name, dev->name, IFNAMSIZ); 2325 ieee80211_debugfs_rename_netdev(sdata); 2326 2327 return NOTIFY_OK; 2328 } 2329 2330 static struct notifier_block mac80211_netdev_notifier = { 2331 .notifier_call = netdev_notify, 2332 }; 2333 ieee80211_iface_init(void)2334 int ieee80211_iface_init(void) 2335 { 2336 return register_netdevice_notifier(&mac80211_netdev_notifier); 2337 } 2338 ieee80211_iface_exit(void)2339 void ieee80211_iface_exit(void) 2340 { 2341 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2342 } 2343 ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2344 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2345 { 2346 if (sdata->vif.type == NL80211_IFTYPE_AP) 2347 atomic_inc(&sdata->u.ap.num_mcast_sta); 2348 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2349 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2350 } 2351 ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2352 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2353 { 2354 if (sdata->vif.type == NL80211_IFTYPE_AP) 2355 atomic_dec(&sdata->u.ap.num_mcast_sta); 2356 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2357 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2358 } 2359 ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data * sdata)2360 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata) 2361 { 2362 struct ieee80211_local *local = sdata->local; 2363 2364 if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) 2365 return; 2366 2367 ieee80211_stop_vif_queues(local, sdata, 2368 IEEE80211_QUEUE_STOP_REASON_CSA); 2369 sdata->csa_blocked_queues = true; 2370 } 2371 ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data * sdata)2372 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata) 2373 { 2374 struct ieee80211_local *local = sdata->local; 2375 2376 if (sdata->csa_blocked_queues) { 2377 ieee80211_wake_vif_queues(local, sdata, 2378 IEEE80211_QUEUE_STOP_REASON_CSA); 2379 sdata->csa_blocked_queues = false; 2380 } 2381 } 2382