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