1 /* 2 * Interface handling 3 * 4 * Copyright 2002-2005, Instant802 Networks, Inc. 5 * Copyright 2005-2006, Devicescape Software, Inc. 6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 8 * Copyright 2013-2014 Intel Mobile Communications GmbH 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 #include <linux/slab.h> 15 #include <linux/kernel.h> 16 #include <linux/if_arp.h> 17 #include <linux/netdevice.h> 18 #include <linux/rtnetlink.h> 19 #include <net/mac80211.h> 20 #include <net/ieee80211_radiotap.h> 21 #include "ieee80211_i.h" 22 #include "sta_info.h" 23 #include "debugfs_netdev.h" 24 #include "mesh.h" 25 #include "led.h" 26 #include "driver-ops.h" 27 #include "wme.h" 28 #include "rate.h" 29 30 /** 31 * DOC: Interface list locking 32 * 33 * The interface list in each struct ieee80211_local is protected 34 * three-fold: 35 * 36 * (1) modifications may only be done under the RTNL 37 * (2) modifications and readers are protected against each other by 38 * the iflist_mtx. 39 * (3) modifications are done in an RCU manner so atomic readers 40 * can traverse the list in RCU-safe blocks. 41 * 42 * As a consequence, reads (traversals) of the list can be protected 43 * by either the RTNL, the iflist_mtx or RCU. 44 */ 45 46 static void ieee80211_iface_work(struct work_struct *work); 47 48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 49 { 50 struct ieee80211_chanctx_conf *chanctx_conf; 51 int power; 52 53 rcu_read_lock(); 54 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 55 if (!chanctx_conf) { 56 rcu_read_unlock(); 57 return false; 58 } 59 60 power = ieee80211_chandef_max_power(&chanctx_conf->def); 61 rcu_read_unlock(); 62 63 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 64 power = min(power, sdata->user_power_level); 65 66 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 67 power = min(power, sdata->ap_power_level); 68 69 if (power != sdata->vif.bss_conf.txpower) { 70 sdata->vif.bss_conf.txpower = power; 71 ieee80211_hw_config(sdata->local, 0); 72 return true; 73 } 74 75 return false; 76 } 77 78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 79 bool update_bss) 80 { 81 if (__ieee80211_recalc_txpower(sdata) || 82 (update_bss && ieee80211_sdata_running(sdata))) 83 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 84 } 85 86 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 87 { 88 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 89 return 0; 90 91 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 92 return IEEE80211_CONF_CHANGE_IDLE; 93 } 94 95 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 96 { 97 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 98 return 0; 99 100 ieee80211_flush_queues(local, NULL, false); 101 102 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 103 return IEEE80211_CONF_CHANGE_IDLE; 104 } 105 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 107 bool force_active) 108 { 109 bool working, scanning, active; 110 unsigned int led_trig_start = 0, led_trig_stop = 0; 111 112 lockdep_assert_held(&local->mtx); 113 114 active = force_active || 115 !list_empty(&local->chanctx_list) || 116 local->monitors; 117 118 working = !local->ops->remain_on_channel && 119 !list_empty(&local->roc_list); 120 121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 123 124 if (working || scanning) 125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 else 127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 128 129 if (active) 130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 else 132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 133 134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 135 136 if (working || scanning || active) 137 return __ieee80211_idle_off(local); 138 return __ieee80211_idle_on(local); 139 } 140 141 u32 ieee80211_idle_off(struct ieee80211_local *local) 142 { 143 return __ieee80211_recalc_idle(local, true); 144 } 145 146 void ieee80211_recalc_idle(struct ieee80211_local *local) 147 { 148 u32 change = __ieee80211_recalc_idle(local, false); 149 if (change) 150 ieee80211_hw_config(local, change); 151 } 152 153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 154 { 155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) 156 return -EINVAL; 157 158 dev->mtu = new_mtu; 159 return 0; 160 } 161 162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 163 bool check_dup) 164 { 165 struct ieee80211_local *local = sdata->local; 166 struct ieee80211_sub_if_data *iter; 167 u64 new, mask, tmp; 168 u8 *m; 169 int ret = 0; 170 171 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 172 return 0; 173 174 m = addr; 175 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 178 179 m = local->hw.wiphy->addr_mask; 180 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 181 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 182 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 183 184 if (!check_dup) 185 return ret; 186 187 mutex_lock(&local->iflist_mtx); 188 list_for_each_entry(iter, &local->interfaces, list) { 189 if (iter == sdata) 190 continue; 191 192 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 193 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 194 continue; 195 196 m = iter->vif.addr; 197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 200 201 if ((new & ~mask) != (tmp & ~mask)) { 202 ret = -EINVAL; 203 break; 204 } 205 } 206 mutex_unlock(&local->iflist_mtx); 207 208 return ret; 209 } 210 211 static int ieee80211_change_mac(struct net_device *dev, void *addr) 212 { 213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 214 struct sockaddr *sa = addr; 215 bool check_dup = true; 216 int ret; 217 218 if (ieee80211_sdata_running(sdata)) 219 return -EBUSY; 220 221 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 222 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 223 check_dup = false; 224 225 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 226 if (ret) 227 return ret; 228 229 ret = eth_mac_addr(dev, sa); 230 231 if (ret == 0) 232 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 233 234 return ret; 235 } 236 237 static inline int identical_mac_addr_allowed(int type1, int type2) 238 { 239 return type1 == NL80211_IFTYPE_MONITOR || 240 type2 == NL80211_IFTYPE_MONITOR || 241 type1 == NL80211_IFTYPE_P2P_DEVICE || 242 type2 == NL80211_IFTYPE_P2P_DEVICE || 243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 244 (type1 == NL80211_IFTYPE_WDS && 245 (type2 == NL80211_IFTYPE_WDS || 246 type2 == NL80211_IFTYPE_AP)) || 247 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 248 (type1 == NL80211_IFTYPE_AP_VLAN && 249 (type2 == NL80211_IFTYPE_AP || 250 type2 == NL80211_IFTYPE_AP_VLAN)); 251 } 252 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 254 enum nl80211_iftype iftype) 255 { 256 struct ieee80211_local *local = sdata->local; 257 struct ieee80211_sub_if_data *nsdata; 258 int ret; 259 260 ASSERT_RTNL(); 261 262 /* we hold the RTNL here so can safely walk the list */ 263 list_for_each_entry(nsdata, &local->interfaces, list) { 264 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 265 /* 266 * Only OCB and monitor mode may coexist 267 */ 268 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 269 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 270 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 271 nsdata->vif.type == NL80211_IFTYPE_OCB)) 272 return -EBUSY; 273 274 /* 275 * Allow only a single IBSS interface to be up at any 276 * time. This is restricted because beacon distribution 277 * cannot work properly if both are in the same IBSS. 278 * 279 * To remove this restriction we'd have to disallow them 280 * from setting the same SSID on different IBSS interfaces 281 * belonging to the same hardware. Then, however, we're 282 * faced with having to adopt two different TSF timers... 283 */ 284 if (iftype == NL80211_IFTYPE_ADHOC && 285 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 286 return -EBUSY; 287 /* 288 * will not add another interface while any channel 289 * switch is active. 290 */ 291 if (nsdata->vif.csa_active) 292 return -EBUSY; 293 294 /* 295 * The remaining checks are only performed for interfaces 296 * with the same MAC address. 297 */ 298 if (!ether_addr_equal(sdata->vif.addr, 299 nsdata->vif.addr)) 300 continue; 301 302 /* 303 * check whether it may have the same address 304 */ 305 if (!identical_mac_addr_allowed(iftype, 306 nsdata->vif.type)) 307 return -ENOTUNIQ; 308 309 /* 310 * can only add VLANs to enabled APs 311 */ 312 if (iftype == NL80211_IFTYPE_AP_VLAN && 313 nsdata->vif.type == NL80211_IFTYPE_AP) 314 sdata->bss = &nsdata->u.ap; 315 } 316 } 317 318 mutex_lock(&local->chanctx_mtx); 319 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 320 mutex_unlock(&local->chanctx_mtx); 321 return ret; 322 } 323 324 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 325 enum nl80211_iftype iftype) 326 { 327 int n_queues = sdata->local->hw.queues; 328 int i; 329 330 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 331 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 332 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 333 IEEE80211_INVAL_HW_QUEUE)) 334 return -EINVAL; 335 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 336 n_queues)) 337 return -EINVAL; 338 } 339 } 340 341 if ((iftype != NL80211_IFTYPE_AP && 342 iftype != NL80211_IFTYPE_P2P_GO && 343 iftype != NL80211_IFTYPE_MESH_POINT) || 344 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 345 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 346 return 0; 347 } 348 349 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 350 return -EINVAL; 351 352 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 353 return -EINVAL; 354 355 return 0; 356 } 357 358 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 359 const int offset) 360 { 361 struct ieee80211_local *local = sdata->local; 362 u32 flags = sdata->u.mntr.flags; 363 364 #define ADJUST(_f, _s) do { \ 365 if (flags & MONITOR_FLAG_##_f) \ 366 local->fif_##_s += offset; \ 367 } while (0) 368 369 ADJUST(FCSFAIL, fcsfail); 370 ADJUST(PLCPFAIL, plcpfail); 371 ADJUST(CONTROL, control); 372 ADJUST(CONTROL, pspoll); 373 ADJUST(OTHER_BSS, other_bss); 374 375 #undef ADJUST 376 } 377 378 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 379 { 380 struct ieee80211_local *local = sdata->local; 381 int i; 382 383 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 384 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 385 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 386 else if (local->hw.queues >= IEEE80211_NUM_ACS) 387 sdata->vif.hw_queue[i] = i; 388 else 389 sdata->vif.hw_queue[i] = 0; 390 } 391 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 392 } 393 394 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 395 { 396 struct ieee80211_sub_if_data *sdata; 397 int ret; 398 399 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 400 return 0; 401 402 ASSERT_RTNL(); 403 404 if (local->monitor_sdata) 405 return 0; 406 407 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 408 if (!sdata) 409 return -ENOMEM; 410 411 /* set up data */ 412 sdata->local = local; 413 sdata->vif.type = NL80211_IFTYPE_MONITOR; 414 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 415 wiphy_name(local->hw.wiphy)); 416 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 417 418 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 419 420 ieee80211_set_default_queues(sdata); 421 422 ret = drv_add_interface(local, sdata); 423 if (WARN_ON(ret)) { 424 /* ok .. stupid driver, it asked for this! */ 425 kfree(sdata); 426 return ret; 427 } 428 429 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 430 if (ret) { 431 kfree(sdata); 432 return ret; 433 } 434 435 mutex_lock(&local->iflist_mtx); 436 rcu_assign_pointer(local->monitor_sdata, sdata); 437 mutex_unlock(&local->iflist_mtx); 438 439 mutex_lock(&local->mtx); 440 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 441 IEEE80211_CHANCTX_EXCLUSIVE); 442 mutex_unlock(&local->mtx); 443 if (ret) { 444 mutex_lock(&local->iflist_mtx); 445 RCU_INIT_POINTER(local->monitor_sdata, NULL); 446 mutex_unlock(&local->iflist_mtx); 447 synchronize_net(); 448 drv_remove_interface(local, sdata); 449 kfree(sdata); 450 return ret; 451 } 452 453 skb_queue_head_init(&sdata->skb_queue); 454 INIT_WORK(&sdata->work, ieee80211_iface_work); 455 456 return 0; 457 } 458 459 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 460 { 461 struct ieee80211_sub_if_data *sdata; 462 463 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 464 return; 465 466 ASSERT_RTNL(); 467 468 mutex_lock(&local->iflist_mtx); 469 470 sdata = rcu_dereference_protected(local->monitor_sdata, 471 lockdep_is_held(&local->iflist_mtx)); 472 if (!sdata) { 473 mutex_unlock(&local->iflist_mtx); 474 return; 475 } 476 477 RCU_INIT_POINTER(local->monitor_sdata, NULL); 478 mutex_unlock(&local->iflist_mtx); 479 480 synchronize_net(); 481 482 mutex_lock(&local->mtx); 483 ieee80211_vif_release_channel(sdata); 484 mutex_unlock(&local->mtx); 485 486 drv_remove_interface(local, sdata); 487 488 kfree(sdata); 489 } 490 491 /* 492 * NOTE: Be very careful when changing this function, it must NOT return 493 * an error on interface type changes that have been pre-checked, so most 494 * checks should be in ieee80211_check_concurrent_iface. 495 */ 496 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 497 { 498 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 499 struct net_device *dev = wdev->netdev; 500 struct ieee80211_local *local = sdata->local; 501 struct sta_info *sta; 502 u32 changed = 0; 503 int res; 504 u32 hw_reconf_flags = 0; 505 506 switch (sdata->vif.type) { 507 case NL80211_IFTYPE_WDS: 508 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 509 return -ENOLINK; 510 break; 511 case NL80211_IFTYPE_AP_VLAN: { 512 struct ieee80211_sub_if_data *master; 513 514 if (!sdata->bss) 515 return -ENOLINK; 516 517 mutex_lock(&local->mtx); 518 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 519 mutex_unlock(&local->mtx); 520 521 master = container_of(sdata->bss, 522 struct ieee80211_sub_if_data, u.ap); 523 sdata->control_port_protocol = 524 master->control_port_protocol; 525 sdata->control_port_no_encrypt = 526 master->control_port_no_encrypt; 527 sdata->vif.cab_queue = master->vif.cab_queue; 528 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 529 sizeof(sdata->vif.hw_queue)); 530 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 531 532 mutex_lock(&local->key_mtx); 533 sdata->crypto_tx_tailroom_needed_cnt += 534 master->crypto_tx_tailroom_needed_cnt; 535 mutex_unlock(&local->key_mtx); 536 537 break; 538 } 539 case NL80211_IFTYPE_AP: 540 sdata->bss = &sdata->u.ap; 541 break; 542 case NL80211_IFTYPE_MESH_POINT: 543 case NL80211_IFTYPE_STATION: 544 case NL80211_IFTYPE_MONITOR: 545 case NL80211_IFTYPE_ADHOC: 546 case NL80211_IFTYPE_P2P_DEVICE: 547 case NL80211_IFTYPE_OCB: 548 /* no special treatment */ 549 break; 550 case NL80211_IFTYPE_UNSPECIFIED: 551 case NUM_NL80211_IFTYPES: 552 case NL80211_IFTYPE_P2P_CLIENT: 553 case NL80211_IFTYPE_P2P_GO: 554 /* cannot happen */ 555 WARN_ON(1); 556 break; 557 } 558 559 if (local->open_count == 0) { 560 res = drv_start(local); 561 if (res) 562 goto err_del_bss; 563 /* we're brought up, everything changes */ 564 hw_reconf_flags = ~0; 565 ieee80211_led_radio(local, true); 566 ieee80211_mod_tpt_led_trig(local, 567 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 568 } 569 570 /* 571 * Copy the hopefully now-present MAC address to 572 * this interface, if it has the special null one. 573 */ 574 if (dev && is_zero_ether_addr(dev->dev_addr)) { 575 memcpy(dev->dev_addr, 576 local->hw.wiphy->perm_addr, 577 ETH_ALEN); 578 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 579 580 if (!is_valid_ether_addr(dev->dev_addr)) { 581 res = -EADDRNOTAVAIL; 582 goto err_stop; 583 } 584 } 585 586 switch (sdata->vif.type) { 587 case NL80211_IFTYPE_AP_VLAN: 588 /* no need to tell driver, but set carrier and chanctx */ 589 if (rtnl_dereference(sdata->bss->beacon)) { 590 ieee80211_vif_vlan_copy_chanctx(sdata); 591 netif_carrier_on(dev); 592 } else { 593 netif_carrier_off(dev); 594 } 595 break; 596 case NL80211_IFTYPE_MONITOR: 597 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 598 local->cooked_mntrs++; 599 break; 600 } 601 602 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 603 res = drv_add_interface(local, sdata); 604 if (res) 605 goto err_stop; 606 } else if (local->monitors == 0 && local->open_count == 0) { 607 res = ieee80211_add_virtual_monitor(local); 608 if (res) 609 goto err_stop; 610 } 611 612 /* must be before the call to ieee80211_configure_filter */ 613 local->monitors++; 614 if (local->monitors == 1) { 615 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 616 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 617 } 618 619 ieee80211_adjust_monitor_flags(sdata, 1); 620 ieee80211_configure_filter(local); 621 mutex_lock(&local->mtx); 622 ieee80211_recalc_idle(local); 623 mutex_unlock(&local->mtx); 624 625 netif_carrier_on(dev); 626 break; 627 default: 628 if (coming_up) { 629 ieee80211_del_virtual_monitor(local); 630 631 res = drv_add_interface(local, sdata); 632 if (res) 633 goto err_stop; 634 res = ieee80211_check_queues(sdata, 635 ieee80211_vif_type_p2p(&sdata->vif)); 636 if (res) 637 goto err_del_interface; 638 } 639 640 if (sdata->vif.type == NL80211_IFTYPE_AP) { 641 local->fif_pspoll++; 642 local->fif_probe_req++; 643 644 ieee80211_configure_filter(local); 645 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 646 local->fif_probe_req++; 647 } 648 649 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 650 changed |= ieee80211_reset_erp_info(sdata); 651 ieee80211_bss_info_change_notify(sdata, changed); 652 653 switch (sdata->vif.type) { 654 case NL80211_IFTYPE_STATION: 655 case NL80211_IFTYPE_ADHOC: 656 case NL80211_IFTYPE_AP: 657 case NL80211_IFTYPE_MESH_POINT: 658 case NL80211_IFTYPE_OCB: 659 netif_carrier_off(dev); 660 break; 661 case NL80211_IFTYPE_WDS: 662 case NL80211_IFTYPE_P2P_DEVICE: 663 break; 664 default: 665 /* not reached */ 666 WARN_ON(1); 667 } 668 669 /* 670 * Set default queue parameters so drivers don't 671 * need to initialise the hardware if the hardware 672 * doesn't start up with sane defaults. 673 * Enable QoS for anything but station interfaces. 674 */ 675 ieee80211_set_wmm_default(sdata, true, 676 sdata->vif.type != NL80211_IFTYPE_STATION); 677 } 678 679 set_bit(SDATA_STATE_RUNNING, &sdata->state); 680 681 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 682 /* Create STA entry for the WDS peer */ 683 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 684 GFP_KERNEL); 685 if (!sta) { 686 res = -ENOMEM; 687 goto err_del_interface; 688 } 689 690 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 691 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 692 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 693 694 res = sta_info_insert(sta); 695 if (res) { 696 /* STA has been freed */ 697 goto err_del_interface; 698 } 699 700 rate_control_rate_init(sta); 701 netif_carrier_on(dev); 702 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 703 rcu_assign_pointer(local->p2p_sdata, sdata); 704 } 705 706 /* 707 * set_multicast_list will be invoked by the networking core 708 * which will check whether any increments here were done in 709 * error and sync them down to the hardware as filter flags. 710 */ 711 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 712 atomic_inc(&local->iff_allmultis); 713 714 if (coming_up) 715 local->open_count++; 716 717 if (hw_reconf_flags) 718 ieee80211_hw_config(local, hw_reconf_flags); 719 720 ieee80211_recalc_ps(local); 721 722 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 723 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 724 /* XXX: for AP_VLAN, actually track AP queues */ 725 netif_tx_start_all_queues(dev); 726 } else if (dev) { 727 unsigned long flags; 728 int n_acs = IEEE80211_NUM_ACS; 729 int ac; 730 731 if (local->hw.queues < IEEE80211_NUM_ACS) 732 n_acs = 1; 733 734 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 735 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 736 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 737 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 738 for (ac = 0; ac < n_acs; ac++) { 739 int ac_queue = sdata->vif.hw_queue[ac]; 740 741 if (local->queue_stop_reasons[ac_queue] == 0 && 742 skb_queue_empty(&local->pending[ac_queue])) 743 netif_start_subqueue(dev, ac); 744 } 745 } 746 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 747 } 748 749 return 0; 750 err_del_interface: 751 drv_remove_interface(local, sdata); 752 err_stop: 753 if (!local->open_count) 754 drv_stop(local); 755 err_del_bss: 756 sdata->bss = NULL; 757 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 758 mutex_lock(&local->mtx); 759 list_del(&sdata->u.vlan.list); 760 mutex_unlock(&local->mtx); 761 } 762 /* might already be clear but that doesn't matter */ 763 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 764 return res; 765 } 766 767 static int ieee80211_open(struct net_device *dev) 768 { 769 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 770 int err; 771 772 /* fail early if user set an invalid address */ 773 if (!is_valid_ether_addr(dev->dev_addr)) 774 return -EADDRNOTAVAIL; 775 776 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 777 if (err) 778 return err; 779 780 return ieee80211_do_open(&sdata->wdev, true); 781 } 782 783 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 784 bool going_down) 785 { 786 struct ieee80211_local *local = sdata->local; 787 struct fq *fq = &local->fq; 788 unsigned long flags; 789 struct sk_buff *skb, *tmp; 790 u32 hw_reconf_flags = 0; 791 int i, flushed; 792 struct ps_data *ps; 793 struct cfg80211_chan_def chandef; 794 bool cancel_scan; 795 796 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 797 798 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 799 if (cancel_scan) 800 ieee80211_scan_cancel(local); 801 802 /* 803 * Stop TX on this interface first. 804 */ 805 if (sdata->dev) 806 netif_tx_stop_all_queues(sdata->dev); 807 808 ieee80211_roc_purge(local, sdata); 809 810 switch (sdata->vif.type) { 811 case NL80211_IFTYPE_STATION: 812 ieee80211_mgd_stop(sdata); 813 break; 814 case NL80211_IFTYPE_ADHOC: 815 ieee80211_ibss_stop(sdata); 816 break; 817 case NL80211_IFTYPE_AP: 818 cancel_work_sync(&sdata->u.ap.request_smps_work); 819 break; 820 default: 821 break; 822 } 823 824 /* 825 * Remove all stations associated with this interface. 826 * 827 * This must be done before calling ops->remove_interface() 828 * because otherwise we can later invoke ops->sta_notify() 829 * whenever the STAs are removed, and that invalidates driver 830 * assumptions about always getting a vif pointer that is valid 831 * (because if we remove a STA after ops->remove_interface() 832 * the driver will have removed the vif info already!) 833 * 834 * In WDS mode a station must exist here and be flushed, for 835 * AP_VLANs stations may exist since there's nothing else that 836 * would have removed them, but in other modes there shouldn't 837 * be any stations. 838 */ 839 flushed = sta_info_flush(sdata); 840 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 841 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 842 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1))); 843 844 /* don't count this interface for allmulti while it is down */ 845 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 846 atomic_dec(&local->iff_allmultis); 847 848 if (sdata->vif.type == NL80211_IFTYPE_AP) { 849 local->fif_pspoll--; 850 local->fif_probe_req--; 851 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 852 local->fif_probe_req--; 853 } 854 855 if (sdata->dev) { 856 netif_addr_lock_bh(sdata->dev); 857 spin_lock_bh(&local->filter_lock); 858 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 859 sdata->dev->addr_len); 860 spin_unlock_bh(&local->filter_lock); 861 netif_addr_unlock_bh(sdata->dev); 862 } 863 864 del_timer_sync(&local->dynamic_ps_timer); 865 cancel_work_sync(&local->dynamic_ps_enable_work); 866 867 cancel_work_sync(&sdata->recalc_smps); 868 sdata_lock(sdata); 869 mutex_lock(&local->mtx); 870 sdata->vif.csa_active = false; 871 if (sdata->vif.type == NL80211_IFTYPE_STATION) 872 sdata->u.mgd.csa_waiting_bcn = false; 873 if (sdata->csa_block_tx) { 874 ieee80211_wake_vif_queues(local, sdata, 875 IEEE80211_QUEUE_STOP_REASON_CSA); 876 sdata->csa_block_tx = false; 877 } 878 mutex_unlock(&local->mtx); 879 sdata_unlock(sdata); 880 881 cancel_work_sync(&sdata->csa_finalize_work); 882 883 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 884 885 if (sdata->wdev.cac_started) { 886 chandef = sdata->vif.bss_conf.chandef; 887 WARN_ON(local->suspended); 888 mutex_lock(&local->mtx); 889 ieee80211_vif_release_channel(sdata); 890 mutex_unlock(&local->mtx); 891 cfg80211_cac_event(sdata->dev, &chandef, 892 NL80211_RADAR_CAC_ABORTED, 893 GFP_KERNEL); 894 } 895 896 /* APs need special treatment */ 897 if (sdata->vif.type == NL80211_IFTYPE_AP) { 898 struct ieee80211_sub_if_data *vlan, *tmpsdata; 899 900 /* down all dependent devices, that is VLANs */ 901 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 902 u.vlan.list) 903 dev_close(vlan->dev); 904 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 905 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 906 /* remove all packets in parent bc_buf pointing to this dev */ 907 ps = &sdata->bss->ps; 908 909 spin_lock_irqsave(&ps->bc_buf.lock, flags); 910 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 911 if (skb->dev == sdata->dev) { 912 __skb_unlink(skb, &ps->bc_buf); 913 local->total_ps_buffered--; 914 ieee80211_free_txskb(&local->hw, skb); 915 } 916 } 917 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 918 } 919 920 if (going_down) 921 local->open_count--; 922 923 switch (sdata->vif.type) { 924 case NL80211_IFTYPE_AP_VLAN: 925 mutex_lock(&local->mtx); 926 list_del(&sdata->u.vlan.list); 927 mutex_unlock(&local->mtx); 928 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 929 /* see comment in the default case below */ 930 ieee80211_free_keys(sdata, true); 931 /* no need to tell driver */ 932 break; 933 case NL80211_IFTYPE_MONITOR: 934 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 935 local->cooked_mntrs--; 936 break; 937 } 938 939 local->monitors--; 940 if (local->monitors == 0) { 941 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 942 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 943 } 944 945 ieee80211_adjust_monitor_flags(sdata, -1); 946 break; 947 case NL80211_IFTYPE_P2P_DEVICE: 948 /* relies on synchronize_rcu() below */ 949 RCU_INIT_POINTER(local->p2p_sdata, NULL); 950 /* fall through */ 951 default: 952 cancel_work_sync(&sdata->work); 953 /* 954 * When we get here, the interface is marked down. 955 * Free the remaining keys, if there are any 956 * (which can happen in AP mode if userspace sets 957 * keys before the interface is operating, and maybe 958 * also in WDS mode) 959 * 960 * Force the key freeing to always synchronize_net() 961 * to wait for the RX path in case it is using this 962 * interface enqueuing frames at this very time on 963 * another CPU. 964 */ 965 ieee80211_free_keys(sdata, true); 966 skb_queue_purge(&sdata->skb_queue); 967 } 968 969 sdata->bss = NULL; 970 971 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 972 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 973 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 974 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 975 if (info->control.vif == &sdata->vif) { 976 __skb_unlink(skb, &local->pending[i]); 977 ieee80211_free_txskb(&local->hw, skb); 978 } 979 } 980 } 981 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 982 983 if (sdata->vif.txq) { 984 struct txq_info *txqi = to_txq_info(sdata->vif.txq); 985 986 spin_lock_bh(&fq->lock); 987 ieee80211_txq_purge(local, txqi); 988 spin_unlock_bh(&fq->lock); 989 } 990 991 if (local->open_count == 0) 992 ieee80211_clear_tx_pending(local); 993 994 /* 995 * If the interface goes down while suspended, presumably because 996 * the device was unplugged and that happens before our resume, 997 * then the driver is already unconfigured and the remainder of 998 * this function isn't needed. 999 * XXX: what about WoWLAN? If the device has software state, e.g. 1000 * memory allocated, it might expect teardown commands from 1001 * mac80211 here? 1002 */ 1003 if (local->suspended) { 1004 WARN_ON(local->wowlan); 1005 WARN_ON(rtnl_dereference(local->monitor_sdata)); 1006 return; 1007 } 1008 1009 switch (sdata->vif.type) { 1010 case NL80211_IFTYPE_AP_VLAN: 1011 break; 1012 case NL80211_IFTYPE_MONITOR: 1013 if (local->monitors == 0) 1014 ieee80211_del_virtual_monitor(local); 1015 1016 mutex_lock(&local->mtx); 1017 ieee80211_recalc_idle(local); 1018 mutex_unlock(&local->mtx); 1019 1020 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 1021 break; 1022 1023 /* fall through */ 1024 default: 1025 if (going_down) 1026 drv_remove_interface(local, sdata); 1027 } 1028 1029 ieee80211_recalc_ps(local); 1030 1031 if (cancel_scan) 1032 flush_delayed_work(&local->scan_work); 1033 1034 if (local->open_count == 0) { 1035 ieee80211_stop_device(local); 1036 1037 /* no reconfiguring after stop! */ 1038 return; 1039 } 1040 1041 /* do after stop to avoid reconfiguring when we stop anyway */ 1042 ieee80211_configure_filter(local); 1043 ieee80211_hw_config(local, hw_reconf_flags); 1044 1045 if (local->monitors == local->open_count) 1046 ieee80211_add_virtual_monitor(local); 1047 } 1048 1049 static int ieee80211_stop(struct net_device *dev) 1050 { 1051 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1052 1053 ieee80211_do_stop(sdata, true); 1054 1055 return 0; 1056 } 1057 1058 static void ieee80211_set_multicast_list(struct net_device *dev) 1059 { 1060 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1061 struct ieee80211_local *local = sdata->local; 1062 int allmulti, sdata_allmulti; 1063 1064 allmulti = !!(dev->flags & IFF_ALLMULTI); 1065 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1066 1067 if (allmulti != sdata_allmulti) { 1068 if (dev->flags & IFF_ALLMULTI) 1069 atomic_inc(&local->iff_allmultis); 1070 else 1071 atomic_dec(&local->iff_allmultis); 1072 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1073 } 1074 1075 spin_lock_bh(&local->filter_lock); 1076 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1077 spin_unlock_bh(&local->filter_lock); 1078 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1079 } 1080 1081 /* 1082 * Called when the netdev is removed or, by the code below, before 1083 * the interface type changes. 1084 */ 1085 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1086 { 1087 int i; 1088 1089 /* free extra data */ 1090 ieee80211_free_keys(sdata, false); 1091 1092 ieee80211_debugfs_remove_netdev(sdata); 1093 1094 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1095 __skb_queue_purge(&sdata->fragments[i].skb_list); 1096 sdata->fragment_next = 0; 1097 1098 if (ieee80211_vif_is_mesh(&sdata->vif)) 1099 ieee80211_mesh_teardown_sdata(sdata); 1100 } 1101 1102 static void ieee80211_uninit(struct net_device *dev) 1103 { 1104 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1105 } 1106 1107 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1108 struct sk_buff *skb, 1109 void *accel_priv, 1110 select_queue_fallback_t fallback) 1111 { 1112 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1113 } 1114 1115 static struct rtnl_link_stats64 * 1116 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 1117 { 1118 int i; 1119 1120 for_each_possible_cpu(i) { 1121 const struct pcpu_sw_netstats *tstats; 1122 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1123 unsigned int start; 1124 1125 tstats = per_cpu_ptr(dev->tstats, i); 1126 1127 do { 1128 start = u64_stats_fetch_begin_irq(&tstats->syncp); 1129 rx_packets = tstats->rx_packets; 1130 tx_packets = tstats->tx_packets; 1131 rx_bytes = tstats->rx_bytes; 1132 tx_bytes = tstats->tx_bytes; 1133 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 1134 1135 stats->rx_packets += rx_packets; 1136 stats->tx_packets += tx_packets; 1137 stats->rx_bytes += rx_bytes; 1138 stats->tx_bytes += tx_bytes; 1139 } 1140 1141 return stats; 1142 } 1143 1144 static const struct net_device_ops ieee80211_dataif_ops = { 1145 .ndo_open = ieee80211_open, 1146 .ndo_stop = ieee80211_stop, 1147 .ndo_uninit = ieee80211_uninit, 1148 .ndo_start_xmit = ieee80211_subif_start_xmit, 1149 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1150 .ndo_change_mtu = ieee80211_change_mtu, 1151 .ndo_set_mac_address = ieee80211_change_mac, 1152 .ndo_select_queue = ieee80211_netdev_select_queue, 1153 .ndo_get_stats64 = ieee80211_get_stats64, 1154 }; 1155 1156 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1157 struct sk_buff *skb, 1158 void *accel_priv, 1159 select_queue_fallback_t fallback) 1160 { 1161 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1162 struct ieee80211_local *local = sdata->local; 1163 struct ieee80211_hdr *hdr; 1164 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1165 1166 if (local->hw.queues < IEEE80211_NUM_ACS) 1167 return 0; 1168 1169 if (skb->len < 4 || 1170 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1171 return 0; /* doesn't matter, frame will be dropped */ 1172 1173 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1174 1175 return ieee80211_select_queue_80211(sdata, skb, hdr); 1176 } 1177 1178 static const struct net_device_ops ieee80211_monitorif_ops = { 1179 .ndo_open = ieee80211_open, 1180 .ndo_stop = ieee80211_stop, 1181 .ndo_uninit = ieee80211_uninit, 1182 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1183 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1184 .ndo_change_mtu = ieee80211_change_mtu, 1185 .ndo_set_mac_address = ieee80211_change_mac, 1186 .ndo_select_queue = ieee80211_monitor_select_queue, 1187 .ndo_get_stats64 = ieee80211_get_stats64, 1188 }; 1189 1190 static void ieee80211_if_free(struct net_device *dev) 1191 { 1192 free_percpu(dev->tstats); 1193 free_netdev(dev); 1194 } 1195 1196 static void ieee80211_if_setup(struct net_device *dev) 1197 { 1198 ether_setup(dev); 1199 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1200 dev->netdev_ops = &ieee80211_dataif_ops; 1201 dev->destructor = ieee80211_if_free; 1202 } 1203 1204 static void ieee80211_if_setup_no_queue(struct net_device *dev) 1205 { 1206 ieee80211_if_setup(dev); 1207 dev->priv_flags |= IFF_NO_QUEUE; 1208 } 1209 1210 static void ieee80211_iface_work(struct work_struct *work) 1211 { 1212 struct ieee80211_sub_if_data *sdata = 1213 container_of(work, struct ieee80211_sub_if_data, work); 1214 struct ieee80211_local *local = sdata->local; 1215 struct sk_buff *skb; 1216 struct sta_info *sta; 1217 struct ieee80211_ra_tid *ra_tid; 1218 struct ieee80211_rx_agg *rx_agg; 1219 1220 if (!ieee80211_sdata_running(sdata)) 1221 return; 1222 1223 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1224 return; 1225 1226 if (!ieee80211_can_run_worker(local)) 1227 return; 1228 1229 /* first process frames */ 1230 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1231 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1232 1233 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1234 ra_tid = (void *)&skb->cb; 1235 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1236 ra_tid->tid); 1237 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1238 ra_tid = (void *)&skb->cb; 1239 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1240 ra_tid->tid); 1241 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) { 1242 rx_agg = (void *)&skb->cb; 1243 mutex_lock(&local->sta_mtx); 1244 sta = sta_info_get_bss(sdata, rx_agg->addr); 1245 if (sta) 1246 __ieee80211_start_rx_ba_session(sta, 1247 0, 0, 0, 1, rx_agg->tid, 1248 IEEE80211_MAX_AMPDU_BUF, 1249 false, true); 1250 mutex_unlock(&local->sta_mtx); 1251 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) { 1252 rx_agg = (void *)&skb->cb; 1253 mutex_lock(&local->sta_mtx); 1254 sta = sta_info_get_bss(sdata, rx_agg->addr); 1255 if (sta) 1256 __ieee80211_stop_rx_ba_session(sta, 1257 rx_agg->tid, 1258 WLAN_BACK_RECIPIENT, 0, 1259 false); 1260 mutex_unlock(&local->sta_mtx); 1261 } else if (ieee80211_is_action(mgmt->frame_control) && 1262 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1263 int len = skb->len; 1264 1265 mutex_lock(&local->sta_mtx); 1266 sta = sta_info_get_bss(sdata, mgmt->sa); 1267 if (sta) { 1268 switch (mgmt->u.action.u.addba_req.action_code) { 1269 case WLAN_ACTION_ADDBA_REQ: 1270 ieee80211_process_addba_request( 1271 local, sta, mgmt, len); 1272 break; 1273 case WLAN_ACTION_ADDBA_RESP: 1274 ieee80211_process_addba_resp(local, sta, 1275 mgmt, len); 1276 break; 1277 case WLAN_ACTION_DELBA: 1278 ieee80211_process_delba(sdata, sta, 1279 mgmt, len); 1280 break; 1281 default: 1282 WARN_ON(1); 1283 break; 1284 } 1285 } 1286 mutex_unlock(&local->sta_mtx); 1287 } else if (ieee80211_is_action(mgmt->frame_control) && 1288 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1289 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1290 case WLAN_VHT_ACTION_GROUPID_MGMT: 1291 ieee80211_process_mu_groups(sdata, mgmt); 1292 break; 1293 default: 1294 WARN_ON(1); 1295 break; 1296 } 1297 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1298 struct ieee80211_hdr *hdr = (void *)mgmt; 1299 /* 1300 * So the frame isn't mgmt, but frame_control 1301 * is at the right place anyway, of course, so 1302 * the if statement is correct. 1303 * 1304 * Warn if we have other data frame types here, 1305 * they must not get here. 1306 */ 1307 WARN_ON(hdr->frame_control & 1308 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1309 WARN_ON(!(hdr->seq_ctrl & 1310 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1311 /* 1312 * This was a fragment of a frame, received while 1313 * a block-ack session was active. That cannot be 1314 * right, so terminate the session. 1315 */ 1316 mutex_lock(&local->sta_mtx); 1317 sta = sta_info_get_bss(sdata, mgmt->sa); 1318 if (sta) { 1319 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1320 IEEE80211_QOS_CTL_TID_MASK; 1321 1322 __ieee80211_stop_rx_ba_session( 1323 sta, tid, WLAN_BACK_RECIPIENT, 1324 WLAN_REASON_QSTA_REQUIRE_SETUP, 1325 true); 1326 } 1327 mutex_unlock(&local->sta_mtx); 1328 } else switch (sdata->vif.type) { 1329 case NL80211_IFTYPE_STATION: 1330 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1331 break; 1332 case NL80211_IFTYPE_ADHOC: 1333 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1334 break; 1335 case NL80211_IFTYPE_MESH_POINT: 1336 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1337 break; 1338 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1339 break; 1340 default: 1341 WARN(1, "frame for unexpected interface type"); 1342 break; 1343 } 1344 1345 kfree_skb(skb); 1346 } 1347 1348 /* then other type-dependent work */ 1349 switch (sdata->vif.type) { 1350 case NL80211_IFTYPE_STATION: 1351 ieee80211_sta_work(sdata); 1352 break; 1353 case NL80211_IFTYPE_ADHOC: 1354 ieee80211_ibss_work(sdata); 1355 break; 1356 case NL80211_IFTYPE_MESH_POINT: 1357 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1358 break; 1359 ieee80211_mesh_work(sdata); 1360 break; 1361 case NL80211_IFTYPE_OCB: 1362 ieee80211_ocb_work(sdata); 1363 break; 1364 default: 1365 break; 1366 } 1367 } 1368 1369 static void ieee80211_recalc_smps_work(struct work_struct *work) 1370 { 1371 struct ieee80211_sub_if_data *sdata = 1372 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1373 1374 ieee80211_recalc_smps(sdata); 1375 } 1376 1377 /* 1378 * Helper function to initialise an interface to a specific type. 1379 */ 1380 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1381 enum nl80211_iftype type) 1382 { 1383 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1384 0xff, 0xff, 0xff}; 1385 1386 /* clear type-dependent union */ 1387 memset(&sdata->u, 0, sizeof(sdata->u)); 1388 1389 /* and set some type-dependent values */ 1390 sdata->vif.type = type; 1391 sdata->vif.p2p = false; 1392 sdata->wdev.iftype = type; 1393 1394 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1395 sdata->control_port_no_encrypt = false; 1396 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1397 sdata->vif.bss_conf.idle = true; 1398 1399 sdata->noack_map = 0; 1400 1401 /* only monitor/p2p-device differ */ 1402 if (sdata->dev) { 1403 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1404 sdata->dev->type = ARPHRD_ETHER; 1405 } 1406 1407 skb_queue_head_init(&sdata->skb_queue); 1408 INIT_WORK(&sdata->work, ieee80211_iface_work); 1409 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1410 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1411 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1412 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1413 1414 switch (type) { 1415 case NL80211_IFTYPE_P2P_GO: 1416 type = NL80211_IFTYPE_AP; 1417 sdata->vif.type = type; 1418 sdata->vif.p2p = true; 1419 /* fall through */ 1420 case NL80211_IFTYPE_AP: 1421 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1422 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1423 INIT_WORK(&sdata->u.ap.request_smps_work, 1424 ieee80211_request_smps_ap_work); 1425 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1426 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1427 break; 1428 case NL80211_IFTYPE_P2P_CLIENT: 1429 type = NL80211_IFTYPE_STATION; 1430 sdata->vif.type = type; 1431 sdata->vif.p2p = true; 1432 /* fall through */ 1433 case NL80211_IFTYPE_STATION: 1434 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1435 ieee80211_sta_setup_sdata(sdata); 1436 break; 1437 case NL80211_IFTYPE_OCB: 1438 sdata->vif.bss_conf.bssid = bssid_wildcard; 1439 ieee80211_ocb_setup_sdata(sdata); 1440 break; 1441 case NL80211_IFTYPE_ADHOC: 1442 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1443 ieee80211_ibss_setup_sdata(sdata); 1444 break; 1445 case NL80211_IFTYPE_MESH_POINT: 1446 if (ieee80211_vif_is_mesh(&sdata->vif)) 1447 ieee80211_mesh_init_sdata(sdata); 1448 break; 1449 case NL80211_IFTYPE_MONITOR: 1450 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1451 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1452 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1453 MONITOR_FLAG_OTHER_BSS; 1454 break; 1455 case NL80211_IFTYPE_WDS: 1456 sdata->vif.bss_conf.bssid = NULL; 1457 break; 1458 case NL80211_IFTYPE_AP_VLAN: 1459 case NL80211_IFTYPE_P2P_DEVICE: 1460 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1461 break; 1462 case NL80211_IFTYPE_UNSPECIFIED: 1463 case NUM_NL80211_IFTYPES: 1464 BUG(); 1465 break; 1466 } 1467 1468 ieee80211_debugfs_add_netdev(sdata); 1469 } 1470 1471 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1472 enum nl80211_iftype type) 1473 { 1474 struct ieee80211_local *local = sdata->local; 1475 int ret, err; 1476 enum nl80211_iftype internal_type = type; 1477 bool p2p = false; 1478 1479 ASSERT_RTNL(); 1480 1481 if (!local->ops->change_interface) 1482 return -EBUSY; 1483 1484 switch (sdata->vif.type) { 1485 case NL80211_IFTYPE_AP: 1486 case NL80211_IFTYPE_STATION: 1487 case NL80211_IFTYPE_ADHOC: 1488 case NL80211_IFTYPE_OCB: 1489 /* 1490 * Could maybe also all others here? 1491 * Just not sure how that interacts 1492 * with the RX/config path e.g. for 1493 * mesh. 1494 */ 1495 break; 1496 default: 1497 return -EBUSY; 1498 } 1499 1500 switch (type) { 1501 case NL80211_IFTYPE_AP: 1502 case NL80211_IFTYPE_STATION: 1503 case NL80211_IFTYPE_ADHOC: 1504 case NL80211_IFTYPE_OCB: 1505 /* 1506 * Could probably support everything 1507 * but WDS here (WDS do_open can fail 1508 * under memory pressure, which this 1509 * code isn't prepared to handle). 1510 */ 1511 break; 1512 case NL80211_IFTYPE_P2P_CLIENT: 1513 p2p = true; 1514 internal_type = NL80211_IFTYPE_STATION; 1515 break; 1516 case NL80211_IFTYPE_P2P_GO: 1517 p2p = true; 1518 internal_type = NL80211_IFTYPE_AP; 1519 break; 1520 default: 1521 return -EBUSY; 1522 } 1523 1524 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1525 if (ret) 1526 return ret; 1527 1528 ieee80211_do_stop(sdata, false); 1529 1530 ieee80211_teardown_sdata(sdata); 1531 1532 ret = drv_change_interface(local, sdata, internal_type, p2p); 1533 if (ret) 1534 type = ieee80211_vif_type_p2p(&sdata->vif); 1535 1536 /* 1537 * Ignore return value here, there's not much we can do since 1538 * the driver changed the interface type internally already. 1539 * The warnings will hopefully make driver authors fix it :-) 1540 */ 1541 ieee80211_check_queues(sdata, type); 1542 1543 ieee80211_setup_sdata(sdata, type); 1544 1545 err = ieee80211_do_open(&sdata->wdev, false); 1546 WARN(err, "type change: do_open returned %d", err); 1547 1548 return ret; 1549 } 1550 1551 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1552 enum nl80211_iftype type) 1553 { 1554 int ret; 1555 1556 ASSERT_RTNL(); 1557 1558 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1559 return 0; 1560 1561 if (ieee80211_sdata_running(sdata)) { 1562 ret = ieee80211_runtime_change_iftype(sdata, type); 1563 if (ret) 1564 return ret; 1565 } else { 1566 /* Purge and reset type-dependent state. */ 1567 ieee80211_teardown_sdata(sdata); 1568 ieee80211_setup_sdata(sdata, type); 1569 } 1570 1571 /* reset some values that shouldn't be kept across type changes */ 1572 if (type == NL80211_IFTYPE_STATION) 1573 sdata->u.mgd.use_4addr = false; 1574 1575 return 0; 1576 } 1577 1578 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1579 u8 *perm_addr, enum nl80211_iftype type) 1580 { 1581 struct ieee80211_sub_if_data *sdata; 1582 u64 mask, start, addr, val, inc; 1583 u8 *m; 1584 u8 tmp_addr[ETH_ALEN]; 1585 int i; 1586 1587 /* default ... something at least */ 1588 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1589 1590 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1591 local->hw.wiphy->n_addresses <= 1) 1592 return; 1593 1594 mutex_lock(&local->iflist_mtx); 1595 1596 switch (type) { 1597 case NL80211_IFTYPE_MONITOR: 1598 /* doesn't matter */ 1599 break; 1600 case NL80211_IFTYPE_WDS: 1601 case NL80211_IFTYPE_AP_VLAN: 1602 /* match up with an AP interface */ 1603 list_for_each_entry(sdata, &local->interfaces, list) { 1604 if (sdata->vif.type != NL80211_IFTYPE_AP) 1605 continue; 1606 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1607 break; 1608 } 1609 /* keep default if no AP interface present */ 1610 break; 1611 case NL80211_IFTYPE_P2P_CLIENT: 1612 case NL80211_IFTYPE_P2P_GO: 1613 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1614 list_for_each_entry(sdata, &local->interfaces, list) { 1615 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1616 continue; 1617 if (!ieee80211_sdata_running(sdata)) 1618 continue; 1619 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1620 goto out_unlock; 1621 } 1622 } 1623 /* otherwise fall through */ 1624 default: 1625 /* assign a new address if possible -- try n_addresses first */ 1626 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1627 bool used = false; 1628 1629 list_for_each_entry(sdata, &local->interfaces, list) { 1630 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1631 sdata->vif.addr)) { 1632 used = true; 1633 break; 1634 } 1635 } 1636 1637 if (!used) { 1638 memcpy(perm_addr, 1639 local->hw.wiphy->addresses[i].addr, 1640 ETH_ALEN); 1641 break; 1642 } 1643 } 1644 1645 /* try mask if available */ 1646 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1647 break; 1648 1649 m = local->hw.wiphy->addr_mask; 1650 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1651 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1652 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1653 1654 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1655 /* not a contiguous mask ... not handled now! */ 1656 pr_info("not contiguous\n"); 1657 break; 1658 } 1659 1660 /* 1661 * Pick address of existing interface in case user changed 1662 * MAC address manually, default to perm_addr. 1663 */ 1664 m = local->hw.wiphy->perm_addr; 1665 list_for_each_entry(sdata, &local->interfaces, list) { 1666 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1667 continue; 1668 m = sdata->vif.addr; 1669 break; 1670 } 1671 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1672 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1673 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1674 1675 inc = 1ULL<<__ffs64(mask); 1676 val = (start & mask); 1677 addr = (start & ~mask) | (val & mask); 1678 do { 1679 bool used = false; 1680 1681 tmp_addr[5] = addr >> 0*8; 1682 tmp_addr[4] = addr >> 1*8; 1683 tmp_addr[3] = addr >> 2*8; 1684 tmp_addr[2] = addr >> 3*8; 1685 tmp_addr[1] = addr >> 4*8; 1686 tmp_addr[0] = addr >> 5*8; 1687 1688 val += inc; 1689 1690 list_for_each_entry(sdata, &local->interfaces, list) { 1691 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1692 used = true; 1693 break; 1694 } 1695 } 1696 1697 if (!used) { 1698 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1699 break; 1700 } 1701 addr = (start & ~mask) | (val & mask); 1702 } while (addr != start); 1703 1704 break; 1705 } 1706 1707 out_unlock: 1708 mutex_unlock(&local->iflist_mtx); 1709 } 1710 1711 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1712 unsigned char name_assign_type, 1713 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1714 struct vif_params *params) 1715 { 1716 struct net_device *ndev = NULL; 1717 struct ieee80211_sub_if_data *sdata = NULL; 1718 struct txq_info *txqi; 1719 void (*if_setup)(struct net_device *dev); 1720 int ret, i; 1721 int txqs = 1; 1722 1723 ASSERT_RTNL(); 1724 1725 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1726 struct wireless_dev *wdev; 1727 1728 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1729 GFP_KERNEL); 1730 if (!sdata) 1731 return -ENOMEM; 1732 wdev = &sdata->wdev; 1733 1734 sdata->dev = NULL; 1735 strlcpy(sdata->name, name, IFNAMSIZ); 1736 ieee80211_assign_perm_addr(local, wdev->address, type); 1737 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1738 } else { 1739 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 1740 sizeof(void *)); 1741 int txq_size = 0; 1742 1743 if (local->ops->wake_tx_queue) 1744 txq_size += sizeof(struct txq_info) + 1745 local->hw.txq_data_size; 1746 1747 if (local->ops->wake_tx_queue) 1748 if_setup = ieee80211_if_setup_no_queue; 1749 else 1750 if_setup = ieee80211_if_setup; 1751 1752 if (local->hw.queues >= IEEE80211_NUM_ACS) 1753 txqs = IEEE80211_NUM_ACS; 1754 1755 ndev = alloc_netdev_mqs(size + txq_size, 1756 name, name_assign_type, 1757 if_setup, txqs, 1); 1758 if (!ndev) 1759 return -ENOMEM; 1760 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1761 1762 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1763 if (!ndev->tstats) { 1764 free_netdev(ndev); 1765 return -ENOMEM; 1766 } 1767 1768 ndev->needed_headroom = local->tx_headroom + 1769 4*6 /* four MAC addresses */ 1770 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1771 + 6 /* mesh */ 1772 + 8 /* rfc1042/bridge tunnel */ 1773 - ETH_HLEN /* ethernet hard_header_len */ 1774 + IEEE80211_ENCRYPT_HEADROOM; 1775 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1776 1777 ret = dev_alloc_name(ndev, ndev->name); 1778 if (ret < 0) { 1779 ieee80211_if_free(ndev); 1780 return ret; 1781 } 1782 1783 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1784 if (params && is_valid_ether_addr(params->macaddr)) 1785 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN); 1786 else 1787 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1788 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1789 1790 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1791 sdata = netdev_priv(ndev); 1792 ndev->ieee80211_ptr = &sdata->wdev; 1793 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1794 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1795 1796 if (txq_size) { 1797 txqi = netdev_priv(ndev) + size; 1798 ieee80211_txq_init(sdata, NULL, txqi, 0); 1799 } 1800 1801 sdata->dev = ndev; 1802 } 1803 1804 /* initialise type-independent data */ 1805 sdata->wdev.wiphy = local->hw.wiphy; 1806 sdata->local = local; 1807 1808 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1809 skb_queue_head_init(&sdata->fragments[i].skb_list); 1810 1811 INIT_LIST_HEAD(&sdata->key_list); 1812 1813 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1814 ieee80211_dfs_cac_timer_work); 1815 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1816 ieee80211_delayed_tailroom_dec); 1817 1818 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1819 struct ieee80211_supported_band *sband; 1820 sband = local->hw.wiphy->bands[i]; 1821 sdata->rc_rateidx_mask[i] = 1822 sband ? (1 << sband->n_bitrates) - 1 : 0; 1823 if (sband) { 1824 __le16 cap; 1825 u16 *vht_rate_mask; 1826 1827 memcpy(sdata->rc_rateidx_mcs_mask[i], 1828 sband->ht_cap.mcs.rx_mask, 1829 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1830 1831 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 1832 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 1833 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 1834 } else { 1835 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1836 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1837 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 1838 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 1839 } 1840 } 1841 1842 ieee80211_set_default_queues(sdata); 1843 1844 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1845 sdata->user_power_level = local->user_power_level; 1846 1847 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1848 1849 /* setup type-dependent data */ 1850 ieee80211_setup_sdata(sdata, type); 1851 1852 if (ndev) { 1853 if (params) { 1854 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1855 if (type == NL80211_IFTYPE_STATION) 1856 sdata->u.mgd.use_4addr = params->use_4addr; 1857 } 1858 1859 ndev->features |= local->hw.netdev_features; 1860 1861 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 1862 1863 ret = register_netdevice(ndev); 1864 if (ret) { 1865 ieee80211_if_free(ndev); 1866 return ret; 1867 } 1868 } 1869 1870 mutex_lock(&local->iflist_mtx); 1871 list_add_tail_rcu(&sdata->list, &local->interfaces); 1872 mutex_unlock(&local->iflist_mtx); 1873 1874 if (new_wdev) 1875 *new_wdev = &sdata->wdev; 1876 1877 return 0; 1878 } 1879 1880 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1881 { 1882 ASSERT_RTNL(); 1883 1884 mutex_lock(&sdata->local->iflist_mtx); 1885 list_del_rcu(&sdata->list); 1886 mutex_unlock(&sdata->local->iflist_mtx); 1887 1888 synchronize_rcu(); 1889 1890 if (sdata->dev) { 1891 unregister_netdevice(sdata->dev); 1892 } else { 1893 cfg80211_unregister_wdev(&sdata->wdev); 1894 ieee80211_teardown_sdata(sdata); 1895 kfree(sdata); 1896 } 1897 } 1898 1899 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1900 { 1901 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1902 return; 1903 ieee80211_do_stop(sdata, true); 1904 } 1905 1906 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1907 { 1908 struct ieee80211_sub_if_data *sdata, *tmp; 1909 LIST_HEAD(unreg_list); 1910 LIST_HEAD(wdev_list); 1911 1912 ASSERT_RTNL(); 1913 1914 /* Before destroying the interfaces, make sure they're all stopped so 1915 * that the hardware is stopped. Otherwise, the driver might still be 1916 * iterating the interfaces during the shutdown, e.g. from a worker 1917 * or from RX processing or similar, and if it does so (using atomic 1918 * iteration) while we're manipulating the list, the iteration will 1919 * crash. 1920 * 1921 * After this, the hardware should be stopped and the driver should 1922 * have stopped all of its activities, so that we can do RCU-unaware 1923 * manipulations of the interface list below. 1924 */ 1925 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 1926 1927 WARN(local->open_count, "%s: open count remains %d\n", 1928 wiphy_name(local->hw.wiphy), local->open_count); 1929 1930 mutex_lock(&local->iflist_mtx); 1931 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1932 list_del(&sdata->list); 1933 1934 if (sdata->dev) 1935 unregister_netdevice_queue(sdata->dev, &unreg_list); 1936 else 1937 list_add(&sdata->list, &wdev_list); 1938 } 1939 mutex_unlock(&local->iflist_mtx); 1940 unregister_netdevice_many(&unreg_list); 1941 1942 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1943 list_del(&sdata->list); 1944 cfg80211_unregister_wdev(&sdata->wdev); 1945 kfree(sdata); 1946 } 1947 } 1948 1949 static int netdev_notify(struct notifier_block *nb, 1950 unsigned long state, void *ptr) 1951 { 1952 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1953 struct ieee80211_sub_if_data *sdata; 1954 1955 if (state != NETDEV_CHANGENAME) 1956 return NOTIFY_DONE; 1957 1958 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1959 return NOTIFY_DONE; 1960 1961 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1962 return NOTIFY_DONE; 1963 1964 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1965 memcpy(sdata->name, dev->name, IFNAMSIZ); 1966 ieee80211_debugfs_rename_netdev(sdata); 1967 1968 return NOTIFY_OK; 1969 } 1970 1971 static struct notifier_block mac80211_netdev_notifier = { 1972 .notifier_call = netdev_notify, 1973 }; 1974 1975 int ieee80211_iface_init(void) 1976 { 1977 return register_netdevice_notifier(&mac80211_netdev_notifier); 1978 } 1979 1980 void ieee80211_iface_exit(void) 1981 { 1982 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1983 } 1984