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_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 154 bool check_dup) 155 { 156 struct ieee80211_local *local = sdata->local; 157 struct ieee80211_sub_if_data *iter; 158 u64 new, mask, tmp; 159 u8 *m; 160 int ret = 0; 161 162 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 163 return 0; 164 165 m = addr; 166 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 167 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 168 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 169 170 m = local->hw.wiphy->addr_mask; 171 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 174 175 if (!check_dup) 176 return ret; 177 178 mutex_lock(&local->iflist_mtx); 179 list_for_each_entry(iter, &local->interfaces, list) { 180 if (iter == sdata) 181 continue; 182 183 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 184 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 185 continue; 186 187 m = iter->vif.addr; 188 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 189 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 190 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 191 192 if ((new & ~mask) != (tmp & ~mask)) { 193 ret = -EINVAL; 194 break; 195 } 196 } 197 mutex_unlock(&local->iflist_mtx); 198 199 return ret; 200 } 201 202 static int ieee80211_change_mac(struct net_device *dev, void *addr) 203 { 204 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 205 struct sockaddr *sa = addr; 206 bool check_dup = true; 207 int ret; 208 209 if (ieee80211_sdata_running(sdata)) 210 return -EBUSY; 211 212 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 213 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 214 check_dup = false; 215 216 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 217 if (ret) 218 return ret; 219 220 ret = eth_mac_addr(dev, sa); 221 222 if (ret == 0) 223 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 224 225 return ret; 226 } 227 228 static inline int identical_mac_addr_allowed(int type1, int type2) 229 { 230 return type1 == NL80211_IFTYPE_MONITOR || 231 type2 == NL80211_IFTYPE_MONITOR || 232 type1 == NL80211_IFTYPE_P2P_DEVICE || 233 type2 == NL80211_IFTYPE_P2P_DEVICE || 234 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 235 (type1 == NL80211_IFTYPE_WDS && 236 (type2 == NL80211_IFTYPE_WDS || 237 type2 == NL80211_IFTYPE_AP)) || 238 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 239 (type1 == NL80211_IFTYPE_AP_VLAN && 240 (type2 == NL80211_IFTYPE_AP || 241 type2 == NL80211_IFTYPE_AP_VLAN)); 242 } 243 244 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 245 enum nl80211_iftype iftype) 246 { 247 struct ieee80211_local *local = sdata->local; 248 struct ieee80211_sub_if_data *nsdata; 249 int ret; 250 251 ASSERT_RTNL(); 252 253 /* we hold the RTNL here so can safely walk the list */ 254 list_for_each_entry(nsdata, &local->interfaces, list) { 255 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 256 /* 257 * Only OCB and monitor mode may coexist 258 */ 259 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 260 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 261 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 262 nsdata->vif.type == NL80211_IFTYPE_OCB)) 263 return -EBUSY; 264 265 /* 266 * Allow only a single IBSS interface to be up at any 267 * time. This is restricted because beacon distribution 268 * cannot work properly if both are in the same IBSS. 269 * 270 * To remove this restriction we'd have to disallow them 271 * from setting the same SSID on different IBSS interfaces 272 * belonging to the same hardware. Then, however, we're 273 * faced with having to adopt two different TSF timers... 274 */ 275 if (iftype == NL80211_IFTYPE_ADHOC && 276 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 277 return -EBUSY; 278 /* 279 * will not add another interface while any channel 280 * switch is active. 281 */ 282 if (nsdata->vif.csa_active) 283 return -EBUSY; 284 285 /* 286 * The remaining checks are only performed for interfaces 287 * with the same MAC address. 288 */ 289 if (!ether_addr_equal(sdata->vif.addr, 290 nsdata->vif.addr)) 291 continue; 292 293 /* 294 * check whether it may have the same address 295 */ 296 if (!identical_mac_addr_allowed(iftype, 297 nsdata->vif.type)) 298 return -ENOTUNIQ; 299 300 /* 301 * can only add VLANs to enabled APs 302 */ 303 if (iftype == NL80211_IFTYPE_AP_VLAN && 304 nsdata->vif.type == NL80211_IFTYPE_AP) 305 sdata->bss = &nsdata->u.ap; 306 } 307 } 308 309 mutex_lock(&local->chanctx_mtx); 310 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 311 mutex_unlock(&local->chanctx_mtx); 312 return ret; 313 } 314 315 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 316 enum nl80211_iftype iftype) 317 { 318 int n_queues = sdata->local->hw.queues; 319 int i; 320 321 if (iftype == NL80211_IFTYPE_NAN) 322 return 0; 323 324 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 325 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 326 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 327 IEEE80211_INVAL_HW_QUEUE)) 328 return -EINVAL; 329 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 330 n_queues)) 331 return -EINVAL; 332 } 333 } 334 335 if ((iftype != NL80211_IFTYPE_AP && 336 iftype != NL80211_IFTYPE_P2P_GO && 337 iftype != NL80211_IFTYPE_MESH_POINT) || 338 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 339 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 340 return 0; 341 } 342 343 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 344 return -EINVAL; 345 346 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 347 return -EINVAL; 348 349 return 0; 350 } 351 352 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 353 const int offset) 354 { 355 struct ieee80211_local *local = sdata->local; 356 u32 flags = sdata->u.mntr.flags; 357 358 #define ADJUST(_f, _s) do { \ 359 if (flags & MONITOR_FLAG_##_f) \ 360 local->fif_##_s += offset; \ 361 } while (0) 362 363 ADJUST(FCSFAIL, fcsfail); 364 ADJUST(PLCPFAIL, plcpfail); 365 ADJUST(CONTROL, control); 366 ADJUST(CONTROL, pspoll); 367 ADJUST(OTHER_BSS, other_bss); 368 369 #undef ADJUST 370 } 371 372 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 373 { 374 struct ieee80211_local *local = sdata->local; 375 int i; 376 377 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 378 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 379 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 380 else if (local->hw.queues >= IEEE80211_NUM_ACS) 381 sdata->vif.hw_queue[i] = i; 382 else 383 sdata->vif.hw_queue[i] = 0; 384 } 385 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 386 } 387 388 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 389 { 390 struct ieee80211_sub_if_data *sdata; 391 int ret; 392 393 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 394 return 0; 395 396 ASSERT_RTNL(); 397 398 if (local->monitor_sdata) 399 return 0; 400 401 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 402 if (!sdata) 403 return -ENOMEM; 404 405 /* set up data */ 406 sdata->local = local; 407 sdata->vif.type = NL80211_IFTYPE_MONITOR; 408 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 409 wiphy_name(local->hw.wiphy)); 410 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 411 412 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 413 414 ieee80211_set_default_queues(sdata); 415 416 ret = drv_add_interface(local, sdata); 417 if (WARN_ON(ret)) { 418 /* ok .. stupid driver, it asked for this! */ 419 kfree(sdata); 420 return ret; 421 } 422 423 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 424 if (ret) { 425 kfree(sdata); 426 return ret; 427 } 428 429 mutex_lock(&local->iflist_mtx); 430 rcu_assign_pointer(local->monitor_sdata, sdata); 431 mutex_unlock(&local->iflist_mtx); 432 433 mutex_lock(&local->mtx); 434 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 435 IEEE80211_CHANCTX_EXCLUSIVE); 436 mutex_unlock(&local->mtx); 437 if (ret) { 438 mutex_lock(&local->iflist_mtx); 439 RCU_INIT_POINTER(local->monitor_sdata, NULL); 440 mutex_unlock(&local->iflist_mtx); 441 synchronize_net(); 442 drv_remove_interface(local, sdata); 443 kfree(sdata); 444 return ret; 445 } 446 447 skb_queue_head_init(&sdata->skb_queue); 448 INIT_WORK(&sdata->work, ieee80211_iface_work); 449 450 return 0; 451 } 452 453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 454 { 455 struct ieee80211_sub_if_data *sdata; 456 457 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 458 return; 459 460 ASSERT_RTNL(); 461 462 mutex_lock(&local->iflist_mtx); 463 464 sdata = rcu_dereference_protected(local->monitor_sdata, 465 lockdep_is_held(&local->iflist_mtx)); 466 if (!sdata) { 467 mutex_unlock(&local->iflist_mtx); 468 return; 469 } 470 471 RCU_INIT_POINTER(local->monitor_sdata, NULL); 472 mutex_unlock(&local->iflist_mtx); 473 474 synchronize_net(); 475 476 mutex_lock(&local->mtx); 477 ieee80211_vif_release_channel(sdata); 478 mutex_unlock(&local->mtx); 479 480 drv_remove_interface(local, sdata); 481 482 kfree(sdata); 483 } 484 485 /* 486 * NOTE: Be very careful when changing this function, it must NOT return 487 * an error on interface type changes that have been pre-checked, so most 488 * checks should be in ieee80211_check_concurrent_iface. 489 */ 490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 491 { 492 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 493 struct net_device *dev = wdev->netdev; 494 struct ieee80211_local *local = sdata->local; 495 struct sta_info *sta; 496 u32 changed = 0; 497 int res; 498 u32 hw_reconf_flags = 0; 499 500 switch (sdata->vif.type) { 501 case NL80211_IFTYPE_WDS: 502 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 503 return -ENOLINK; 504 break; 505 case NL80211_IFTYPE_AP_VLAN: { 506 struct ieee80211_sub_if_data *master; 507 508 if (!sdata->bss) 509 return -ENOLINK; 510 511 mutex_lock(&local->mtx); 512 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 513 mutex_unlock(&local->mtx); 514 515 master = container_of(sdata->bss, 516 struct ieee80211_sub_if_data, u.ap); 517 sdata->control_port_protocol = 518 master->control_port_protocol; 519 sdata->control_port_no_encrypt = 520 master->control_port_no_encrypt; 521 sdata->vif.cab_queue = master->vif.cab_queue; 522 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 523 sizeof(sdata->vif.hw_queue)); 524 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 525 526 mutex_lock(&local->key_mtx); 527 sdata->crypto_tx_tailroom_needed_cnt += 528 master->crypto_tx_tailroom_needed_cnt; 529 mutex_unlock(&local->key_mtx); 530 531 break; 532 } 533 case NL80211_IFTYPE_AP: 534 sdata->bss = &sdata->u.ap; 535 break; 536 case NL80211_IFTYPE_MESH_POINT: 537 case NL80211_IFTYPE_STATION: 538 case NL80211_IFTYPE_MONITOR: 539 case NL80211_IFTYPE_ADHOC: 540 case NL80211_IFTYPE_P2P_DEVICE: 541 case NL80211_IFTYPE_OCB: 542 case NL80211_IFTYPE_NAN: 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 sdata->vif.type != NL80211_IFTYPE_NAN) 646 changed |= ieee80211_reset_erp_info(sdata); 647 ieee80211_bss_info_change_notify(sdata, changed); 648 649 switch (sdata->vif.type) { 650 case NL80211_IFTYPE_STATION: 651 case NL80211_IFTYPE_ADHOC: 652 case NL80211_IFTYPE_AP: 653 case NL80211_IFTYPE_MESH_POINT: 654 case NL80211_IFTYPE_OCB: 655 netif_carrier_off(dev); 656 break; 657 case NL80211_IFTYPE_WDS: 658 case NL80211_IFTYPE_P2P_DEVICE: 659 case NL80211_IFTYPE_NAN: 660 break; 661 default: 662 /* not reached */ 663 WARN_ON(1); 664 } 665 666 /* 667 * Set default queue parameters so drivers don't 668 * need to initialise the hardware if the hardware 669 * doesn't start up with sane defaults. 670 * Enable QoS for anything but station interfaces. 671 */ 672 ieee80211_set_wmm_default(sdata, true, 673 sdata->vif.type != NL80211_IFTYPE_STATION); 674 } 675 676 set_bit(SDATA_STATE_RUNNING, &sdata->state); 677 678 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 679 /* Create STA entry for the WDS peer */ 680 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 681 GFP_KERNEL); 682 if (!sta) { 683 res = -ENOMEM; 684 goto err_del_interface; 685 } 686 687 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 688 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 689 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 690 691 res = sta_info_insert(sta); 692 if (res) { 693 /* STA has been freed */ 694 goto err_del_interface; 695 } 696 697 rate_control_rate_init(sta); 698 netif_carrier_on(dev); 699 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 700 rcu_assign_pointer(local->p2p_sdata, sdata); 701 } 702 703 /* 704 * set_multicast_list will be invoked by the networking core 705 * which will check whether any increments here were done in 706 * error and sync them down to the hardware as filter flags. 707 */ 708 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 709 atomic_inc(&local->iff_allmultis); 710 711 if (coming_up) 712 local->open_count++; 713 714 if (hw_reconf_flags) 715 ieee80211_hw_config(local, hw_reconf_flags); 716 717 ieee80211_recalc_ps(local); 718 719 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 720 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 721 /* XXX: for AP_VLAN, actually track AP queues */ 722 netif_tx_start_all_queues(dev); 723 } else if (dev) { 724 unsigned long flags; 725 int n_acs = IEEE80211_NUM_ACS; 726 int ac; 727 728 if (local->hw.queues < IEEE80211_NUM_ACS) 729 n_acs = 1; 730 731 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 732 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 733 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 734 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 735 for (ac = 0; ac < n_acs; ac++) { 736 int ac_queue = sdata->vif.hw_queue[ac]; 737 738 if (local->queue_stop_reasons[ac_queue] == 0 && 739 skb_queue_empty(&local->pending[ac_queue])) 740 netif_start_subqueue(dev, ac); 741 } 742 } 743 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 744 } 745 746 return 0; 747 err_del_interface: 748 drv_remove_interface(local, sdata); 749 err_stop: 750 if (!local->open_count) 751 drv_stop(local); 752 err_del_bss: 753 sdata->bss = NULL; 754 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 755 mutex_lock(&local->mtx); 756 list_del(&sdata->u.vlan.list); 757 mutex_unlock(&local->mtx); 758 } 759 /* might already be clear but that doesn't matter */ 760 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 761 return res; 762 } 763 764 static int ieee80211_open(struct net_device *dev) 765 { 766 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 767 int err; 768 769 /* fail early if user set an invalid address */ 770 if (!is_valid_ether_addr(dev->dev_addr)) 771 return -EADDRNOTAVAIL; 772 773 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 774 if (err) 775 return err; 776 777 return ieee80211_do_open(&sdata->wdev, true); 778 } 779 780 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 781 bool going_down) 782 { 783 struct ieee80211_local *local = sdata->local; 784 struct fq *fq = &local->fq; 785 unsigned long flags; 786 struct sk_buff *skb, *tmp; 787 u32 hw_reconf_flags = 0; 788 int i, flushed; 789 struct ps_data *ps; 790 struct cfg80211_chan_def chandef; 791 bool cancel_scan; 792 struct cfg80211_nan_func *func; 793 794 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 795 796 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 797 if (cancel_scan) 798 ieee80211_scan_cancel(local); 799 800 /* 801 * Stop TX on this interface first. 802 */ 803 if (sdata->dev) 804 netif_tx_stop_all_queues(sdata->dev); 805 806 ieee80211_roc_purge(local, sdata); 807 808 switch (sdata->vif.type) { 809 case NL80211_IFTYPE_STATION: 810 ieee80211_mgd_stop(sdata); 811 break; 812 case NL80211_IFTYPE_ADHOC: 813 ieee80211_ibss_stop(sdata); 814 break; 815 case NL80211_IFTYPE_AP: 816 cancel_work_sync(&sdata->u.ap.request_smps_work); 817 break; 818 default: 819 break; 820 } 821 822 /* 823 * Remove all stations associated with this interface. 824 * 825 * This must be done before calling ops->remove_interface() 826 * because otherwise we can later invoke ops->sta_notify() 827 * whenever the STAs are removed, and that invalidates driver 828 * assumptions about always getting a vif pointer that is valid 829 * (because if we remove a STA after ops->remove_interface() 830 * the driver will have removed the vif info already!) 831 * 832 * In WDS mode a station must exist here and be flushed, for 833 * AP_VLANs stations may exist since there's nothing else that 834 * would have removed them, but in other modes there shouldn't 835 * be any stations. 836 */ 837 flushed = sta_info_flush(sdata); 838 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 839 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 840 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1))); 841 842 /* don't count this interface for allmulti while it is down */ 843 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 844 atomic_dec(&local->iff_allmultis); 845 846 if (sdata->vif.type == NL80211_IFTYPE_AP) { 847 local->fif_pspoll--; 848 local->fif_probe_req--; 849 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 850 local->fif_probe_req--; 851 } 852 853 if (sdata->dev) { 854 netif_addr_lock_bh(sdata->dev); 855 spin_lock_bh(&local->filter_lock); 856 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 857 sdata->dev->addr_len); 858 spin_unlock_bh(&local->filter_lock); 859 netif_addr_unlock_bh(sdata->dev); 860 } 861 862 del_timer_sync(&local->dynamic_ps_timer); 863 cancel_work_sync(&local->dynamic_ps_enable_work); 864 865 cancel_work_sync(&sdata->recalc_smps); 866 sdata_lock(sdata); 867 mutex_lock(&local->mtx); 868 sdata->vif.csa_active = false; 869 if (sdata->vif.type == NL80211_IFTYPE_STATION) 870 sdata->u.mgd.csa_waiting_bcn = false; 871 if (sdata->csa_block_tx) { 872 ieee80211_wake_vif_queues(local, sdata, 873 IEEE80211_QUEUE_STOP_REASON_CSA); 874 sdata->csa_block_tx = false; 875 } 876 mutex_unlock(&local->mtx); 877 sdata_unlock(sdata); 878 879 cancel_work_sync(&sdata->csa_finalize_work); 880 881 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 882 883 if (sdata->wdev.cac_started) { 884 chandef = sdata->vif.bss_conf.chandef; 885 WARN_ON(local->suspended); 886 mutex_lock(&local->mtx); 887 ieee80211_vif_release_channel(sdata); 888 mutex_unlock(&local->mtx); 889 cfg80211_cac_event(sdata->dev, &chandef, 890 NL80211_RADAR_CAC_ABORTED, 891 GFP_KERNEL); 892 } 893 894 /* APs need special treatment */ 895 if (sdata->vif.type == NL80211_IFTYPE_AP) { 896 struct ieee80211_sub_if_data *vlan, *tmpsdata; 897 898 /* down all dependent devices, that is VLANs */ 899 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 900 u.vlan.list) 901 dev_close(vlan->dev); 902 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 903 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 904 /* remove all packets in parent bc_buf pointing to this dev */ 905 ps = &sdata->bss->ps; 906 907 spin_lock_irqsave(&ps->bc_buf.lock, flags); 908 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 909 if (skb->dev == sdata->dev) { 910 __skb_unlink(skb, &ps->bc_buf); 911 local->total_ps_buffered--; 912 ieee80211_free_txskb(&local->hw, skb); 913 } 914 } 915 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 916 } 917 918 if (going_down) 919 local->open_count--; 920 921 switch (sdata->vif.type) { 922 case NL80211_IFTYPE_AP_VLAN: 923 mutex_lock(&local->mtx); 924 list_del(&sdata->u.vlan.list); 925 mutex_unlock(&local->mtx); 926 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 927 /* see comment in the default case below */ 928 ieee80211_free_keys(sdata, true); 929 /* no need to tell driver */ 930 break; 931 case NL80211_IFTYPE_MONITOR: 932 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 933 local->cooked_mntrs--; 934 break; 935 } 936 937 local->monitors--; 938 if (local->monitors == 0) { 939 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 940 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 941 } 942 943 ieee80211_adjust_monitor_flags(sdata, -1); 944 break; 945 case NL80211_IFTYPE_NAN: 946 /* clean all the functions */ 947 spin_lock_bh(&sdata->u.nan.func_lock); 948 949 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 950 idr_remove(&sdata->u.nan.function_inst_ids, i); 951 cfg80211_free_nan_func(func); 952 } 953 idr_destroy(&sdata->u.nan.function_inst_ids); 954 955 spin_unlock_bh(&sdata->u.nan.func_lock); 956 break; 957 case NL80211_IFTYPE_P2P_DEVICE: 958 /* relies on synchronize_rcu() below */ 959 RCU_INIT_POINTER(local->p2p_sdata, NULL); 960 /* fall through */ 961 default: 962 cancel_work_sync(&sdata->work); 963 /* 964 * When we get here, the interface is marked down. 965 * Free the remaining keys, if there are any 966 * (which can happen in AP mode if userspace sets 967 * keys before the interface is operating, and maybe 968 * also in WDS mode) 969 * 970 * Force the key freeing to always synchronize_net() 971 * to wait for the RX path in case it is using this 972 * interface enqueuing frames at this very time on 973 * another CPU. 974 */ 975 ieee80211_free_keys(sdata, true); 976 skb_queue_purge(&sdata->skb_queue); 977 } 978 979 sdata->bss = NULL; 980 981 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 982 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 983 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 984 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 985 if (info->control.vif == &sdata->vif) { 986 __skb_unlink(skb, &local->pending[i]); 987 ieee80211_free_txskb(&local->hw, skb); 988 } 989 } 990 } 991 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 992 993 if (sdata->vif.txq) { 994 struct txq_info *txqi = to_txq_info(sdata->vif.txq); 995 996 spin_lock_bh(&fq->lock); 997 ieee80211_txq_purge(local, txqi); 998 spin_unlock_bh(&fq->lock); 999 } 1000 1001 if (local->open_count == 0) 1002 ieee80211_clear_tx_pending(local); 1003 1004 /* 1005 * If the interface goes down while suspended, presumably because 1006 * the device was unplugged and that happens before our resume, 1007 * then the driver is already unconfigured and the remainder of 1008 * this function isn't needed. 1009 * XXX: what about WoWLAN? If the device has software state, e.g. 1010 * memory allocated, it might expect teardown commands from 1011 * mac80211 here? 1012 */ 1013 if (local->suspended) { 1014 WARN_ON(local->wowlan); 1015 WARN_ON(rtnl_dereference(local->monitor_sdata)); 1016 return; 1017 } 1018 1019 switch (sdata->vif.type) { 1020 case NL80211_IFTYPE_AP_VLAN: 1021 break; 1022 case NL80211_IFTYPE_MONITOR: 1023 if (local->monitors == 0) 1024 ieee80211_del_virtual_monitor(local); 1025 1026 mutex_lock(&local->mtx); 1027 ieee80211_recalc_idle(local); 1028 mutex_unlock(&local->mtx); 1029 1030 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 1031 break; 1032 1033 /* fall through */ 1034 default: 1035 if (going_down) 1036 drv_remove_interface(local, sdata); 1037 } 1038 1039 ieee80211_recalc_ps(local); 1040 1041 if (cancel_scan) 1042 flush_delayed_work(&local->scan_work); 1043 1044 if (local->open_count == 0) { 1045 ieee80211_stop_device(local); 1046 1047 /* no reconfiguring after stop! */ 1048 return; 1049 } 1050 1051 /* do after stop to avoid reconfiguring when we stop anyway */ 1052 ieee80211_configure_filter(local); 1053 ieee80211_hw_config(local, hw_reconf_flags); 1054 1055 if (local->monitors == local->open_count) 1056 ieee80211_add_virtual_monitor(local); 1057 } 1058 1059 static int ieee80211_stop(struct net_device *dev) 1060 { 1061 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1062 1063 ieee80211_do_stop(sdata, true); 1064 1065 return 0; 1066 } 1067 1068 static void ieee80211_set_multicast_list(struct net_device *dev) 1069 { 1070 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1071 struct ieee80211_local *local = sdata->local; 1072 int allmulti, sdata_allmulti; 1073 1074 allmulti = !!(dev->flags & IFF_ALLMULTI); 1075 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1076 1077 if (allmulti != sdata_allmulti) { 1078 if (dev->flags & IFF_ALLMULTI) 1079 atomic_inc(&local->iff_allmultis); 1080 else 1081 atomic_dec(&local->iff_allmultis); 1082 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1083 } 1084 1085 spin_lock_bh(&local->filter_lock); 1086 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1087 spin_unlock_bh(&local->filter_lock); 1088 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1089 } 1090 1091 /* 1092 * Called when the netdev is removed or, by the code below, before 1093 * the interface type changes. 1094 */ 1095 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1096 { 1097 int i; 1098 1099 /* free extra data */ 1100 ieee80211_free_keys(sdata, false); 1101 1102 ieee80211_debugfs_remove_netdev(sdata); 1103 1104 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1105 __skb_queue_purge(&sdata->fragments[i].skb_list); 1106 sdata->fragment_next = 0; 1107 1108 if (ieee80211_vif_is_mesh(&sdata->vif)) 1109 ieee80211_mesh_teardown_sdata(sdata); 1110 } 1111 1112 static void ieee80211_uninit(struct net_device *dev) 1113 { 1114 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1115 } 1116 1117 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1118 struct sk_buff *skb, 1119 void *accel_priv, 1120 select_queue_fallback_t fallback) 1121 { 1122 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1123 } 1124 1125 static struct rtnl_link_stats64 * 1126 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 1127 { 1128 int i; 1129 1130 for_each_possible_cpu(i) { 1131 const struct pcpu_sw_netstats *tstats; 1132 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1133 unsigned int start; 1134 1135 tstats = per_cpu_ptr(dev->tstats, i); 1136 1137 do { 1138 start = u64_stats_fetch_begin_irq(&tstats->syncp); 1139 rx_packets = tstats->rx_packets; 1140 tx_packets = tstats->tx_packets; 1141 rx_bytes = tstats->rx_bytes; 1142 tx_bytes = tstats->tx_bytes; 1143 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 1144 1145 stats->rx_packets += rx_packets; 1146 stats->tx_packets += tx_packets; 1147 stats->rx_bytes += rx_bytes; 1148 stats->tx_bytes += tx_bytes; 1149 } 1150 1151 return stats; 1152 } 1153 1154 static const struct net_device_ops ieee80211_dataif_ops = { 1155 .ndo_open = ieee80211_open, 1156 .ndo_stop = ieee80211_stop, 1157 .ndo_uninit = ieee80211_uninit, 1158 .ndo_start_xmit = ieee80211_subif_start_xmit, 1159 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1160 .ndo_set_mac_address = ieee80211_change_mac, 1161 .ndo_select_queue = ieee80211_netdev_select_queue, 1162 .ndo_get_stats64 = ieee80211_get_stats64, 1163 }; 1164 1165 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1166 struct sk_buff *skb, 1167 void *accel_priv, 1168 select_queue_fallback_t fallback) 1169 { 1170 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1171 struct ieee80211_local *local = sdata->local; 1172 struct ieee80211_hdr *hdr; 1173 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1174 1175 if (local->hw.queues < IEEE80211_NUM_ACS) 1176 return 0; 1177 1178 if (skb->len < 4 || 1179 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1180 return 0; /* doesn't matter, frame will be dropped */ 1181 1182 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1183 1184 return ieee80211_select_queue_80211(sdata, skb, hdr); 1185 } 1186 1187 static const struct net_device_ops ieee80211_monitorif_ops = { 1188 .ndo_open = ieee80211_open, 1189 .ndo_stop = ieee80211_stop, 1190 .ndo_uninit = ieee80211_uninit, 1191 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1192 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1193 .ndo_set_mac_address = ieee80211_change_mac, 1194 .ndo_select_queue = ieee80211_monitor_select_queue, 1195 .ndo_get_stats64 = ieee80211_get_stats64, 1196 }; 1197 1198 static void ieee80211_if_free(struct net_device *dev) 1199 { 1200 free_percpu(dev->tstats); 1201 free_netdev(dev); 1202 } 1203 1204 static void ieee80211_if_setup(struct net_device *dev) 1205 { 1206 ether_setup(dev); 1207 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1208 dev->netdev_ops = &ieee80211_dataif_ops; 1209 dev->destructor = ieee80211_if_free; 1210 } 1211 1212 static void ieee80211_if_setup_no_queue(struct net_device *dev) 1213 { 1214 ieee80211_if_setup(dev); 1215 dev->priv_flags |= IFF_NO_QUEUE; 1216 } 1217 1218 static void ieee80211_iface_work(struct work_struct *work) 1219 { 1220 struct ieee80211_sub_if_data *sdata = 1221 container_of(work, struct ieee80211_sub_if_data, work); 1222 struct ieee80211_local *local = sdata->local; 1223 struct sk_buff *skb; 1224 struct sta_info *sta; 1225 struct ieee80211_ra_tid *ra_tid; 1226 struct ieee80211_rx_agg *rx_agg; 1227 1228 if (!ieee80211_sdata_running(sdata)) 1229 return; 1230 1231 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) 1232 return; 1233 1234 if (!ieee80211_can_run_worker(local)) 1235 return; 1236 1237 /* first process frames */ 1238 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1239 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1240 1241 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1242 ra_tid = (void *)&skb->cb; 1243 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1244 ra_tid->tid); 1245 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1246 ra_tid = (void *)&skb->cb; 1247 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1248 ra_tid->tid); 1249 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) { 1250 rx_agg = (void *)&skb->cb; 1251 mutex_lock(&local->sta_mtx); 1252 sta = sta_info_get_bss(sdata, rx_agg->addr); 1253 if (sta) 1254 __ieee80211_start_rx_ba_session(sta, 1255 0, 0, 0, 1, rx_agg->tid, 1256 IEEE80211_MAX_AMPDU_BUF, 1257 false, true); 1258 mutex_unlock(&local->sta_mtx); 1259 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) { 1260 rx_agg = (void *)&skb->cb; 1261 mutex_lock(&local->sta_mtx); 1262 sta = sta_info_get_bss(sdata, rx_agg->addr); 1263 if (sta) 1264 __ieee80211_stop_rx_ba_session(sta, 1265 rx_agg->tid, 1266 WLAN_BACK_RECIPIENT, 0, 1267 false); 1268 mutex_unlock(&local->sta_mtx); 1269 } else if (ieee80211_is_action(mgmt->frame_control) && 1270 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1271 int len = skb->len; 1272 1273 mutex_lock(&local->sta_mtx); 1274 sta = sta_info_get_bss(sdata, mgmt->sa); 1275 if (sta) { 1276 switch (mgmt->u.action.u.addba_req.action_code) { 1277 case WLAN_ACTION_ADDBA_REQ: 1278 ieee80211_process_addba_request( 1279 local, sta, mgmt, len); 1280 break; 1281 case WLAN_ACTION_ADDBA_RESP: 1282 ieee80211_process_addba_resp(local, sta, 1283 mgmt, len); 1284 break; 1285 case WLAN_ACTION_DELBA: 1286 ieee80211_process_delba(sdata, sta, 1287 mgmt, len); 1288 break; 1289 default: 1290 WARN_ON(1); 1291 break; 1292 } 1293 } 1294 mutex_unlock(&local->sta_mtx); 1295 } else if (ieee80211_is_action(mgmt->frame_control) && 1296 mgmt->u.action.category == WLAN_CATEGORY_VHT) { 1297 switch (mgmt->u.action.u.vht_group_notif.action_code) { 1298 case WLAN_VHT_ACTION_GROUPID_MGMT: 1299 ieee80211_process_mu_groups(sdata, mgmt); 1300 break; 1301 default: 1302 WARN_ON(1); 1303 break; 1304 } 1305 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1306 struct ieee80211_hdr *hdr = (void *)mgmt; 1307 /* 1308 * So the frame isn't mgmt, but frame_control 1309 * is at the right place anyway, of course, so 1310 * the if statement is correct. 1311 * 1312 * Warn if we have other data frame types here, 1313 * they must not get here. 1314 */ 1315 WARN_ON(hdr->frame_control & 1316 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1317 WARN_ON(!(hdr->seq_ctrl & 1318 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1319 /* 1320 * This was a fragment of a frame, received while 1321 * a block-ack session was active. That cannot be 1322 * right, so terminate the session. 1323 */ 1324 mutex_lock(&local->sta_mtx); 1325 sta = sta_info_get_bss(sdata, mgmt->sa); 1326 if (sta) { 1327 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1328 IEEE80211_QOS_CTL_TID_MASK; 1329 1330 __ieee80211_stop_rx_ba_session( 1331 sta, tid, WLAN_BACK_RECIPIENT, 1332 WLAN_REASON_QSTA_REQUIRE_SETUP, 1333 true); 1334 } 1335 mutex_unlock(&local->sta_mtx); 1336 } else switch (sdata->vif.type) { 1337 case NL80211_IFTYPE_STATION: 1338 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1339 break; 1340 case NL80211_IFTYPE_ADHOC: 1341 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1342 break; 1343 case NL80211_IFTYPE_MESH_POINT: 1344 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1345 break; 1346 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1347 break; 1348 default: 1349 WARN(1, "frame for unexpected interface type"); 1350 break; 1351 } 1352 1353 kfree_skb(skb); 1354 } 1355 1356 /* then other type-dependent work */ 1357 switch (sdata->vif.type) { 1358 case NL80211_IFTYPE_STATION: 1359 ieee80211_sta_work(sdata); 1360 break; 1361 case NL80211_IFTYPE_ADHOC: 1362 ieee80211_ibss_work(sdata); 1363 break; 1364 case NL80211_IFTYPE_MESH_POINT: 1365 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1366 break; 1367 ieee80211_mesh_work(sdata); 1368 break; 1369 case NL80211_IFTYPE_OCB: 1370 ieee80211_ocb_work(sdata); 1371 break; 1372 default: 1373 break; 1374 } 1375 } 1376 1377 static void ieee80211_recalc_smps_work(struct work_struct *work) 1378 { 1379 struct ieee80211_sub_if_data *sdata = 1380 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1381 1382 ieee80211_recalc_smps(sdata); 1383 } 1384 1385 /* 1386 * Helper function to initialise an interface to a specific type. 1387 */ 1388 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1389 enum nl80211_iftype type) 1390 { 1391 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1392 0xff, 0xff, 0xff}; 1393 1394 /* clear type-dependent union */ 1395 memset(&sdata->u, 0, sizeof(sdata->u)); 1396 1397 /* and set some type-dependent values */ 1398 sdata->vif.type = type; 1399 sdata->vif.p2p = false; 1400 sdata->wdev.iftype = type; 1401 1402 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1403 sdata->control_port_no_encrypt = false; 1404 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1405 sdata->vif.bss_conf.idle = true; 1406 1407 sdata->noack_map = 0; 1408 1409 /* only monitor/p2p-device differ */ 1410 if (sdata->dev) { 1411 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1412 sdata->dev->type = ARPHRD_ETHER; 1413 } 1414 1415 skb_queue_head_init(&sdata->skb_queue); 1416 INIT_WORK(&sdata->work, ieee80211_iface_work); 1417 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1418 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1419 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1420 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1421 1422 switch (type) { 1423 case NL80211_IFTYPE_P2P_GO: 1424 type = NL80211_IFTYPE_AP; 1425 sdata->vif.type = type; 1426 sdata->vif.p2p = true; 1427 /* fall through */ 1428 case NL80211_IFTYPE_AP: 1429 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1430 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1431 INIT_WORK(&sdata->u.ap.request_smps_work, 1432 ieee80211_request_smps_ap_work); 1433 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1434 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1435 break; 1436 case NL80211_IFTYPE_P2P_CLIENT: 1437 type = NL80211_IFTYPE_STATION; 1438 sdata->vif.type = type; 1439 sdata->vif.p2p = true; 1440 /* fall through */ 1441 case NL80211_IFTYPE_STATION: 1442 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1443 ieee80211_sta_setup_sdata(sdata); 1444 break; 1445 case NL80211_IFTYPE_OCB: 1446 sdata->vif.bss_conf.bssid = bssid_wildcard; 1447 ieee80211_ocb_setup_sdata(sdata); 1448 break; 1449 case NL80211_IFTYPE_ADHOC: 1450 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1451 ieee80211_ibss_setup_sdata(sdata); 1452 break; 1453 case NL80211_IFTYPE_MESH_POINT: 1454 if (ieee80211_vif_is_mesh(&sdata->vif)) 1455 ieee80211_mesh_init_sdata(sdata); 1456 break; 1457 case NL80211_IFTYPE_MONITOR: 1458 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1459 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1460 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1461 MONITOR_FLAG_OTHER_BSS; 1462 break; 1463 case NL80211_IFTYPE_WDS: 1464 sdata->vif.bss_conf.bssid = NULL; 1465 break; 1466 case NL80211_IFTYPE_NAN: 1467 idr_init(&sdata->u.nan.function_inst_ids); 1468 spin_lock_init(&sdata->u.nan.func_lock); 1469 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1470 break; 1471 case NL80211_IFTYPE_AP_VLAN: 1472 case NL80211_IFTYPE_P2P_DEVICE: 1473 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1474 break; 1475 case NL80211_IFTYPE_UNSPECIFIED: 1476 case NUM_NL80211_IFTYPES: 1477 BUG(); 1478 break; 1479 } 1480 1481 ieee80211_debugfs_add_netdev(sdata); 1482 } 1483 1484 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1485 enum nl80211_iftype type) 1486 { 1487 struct ieee80211_local *local = sdata->local; 1488 int ret, err; 1489 enum nl80211_iftype internal_type = type; 1490 bool p2p = false; 1491 1492 ASSERT_RTNL(); 1493 1494 if (!local->ops->change_interface) 1495 return -EBUSY; 1496 1497 switch (sdata->vif.type) { 1498 case NL80211_IFTYPE_AP: 1499 case NL80211_IFTYPE_STATION: 1500 case NL80211_IFTYPE_ADHOC: 1501 case NL80211_IFTYPE_OCB: 1502 /* 1503 * Could maybe also all others here? 1504 * Just not sure how that interacts 1505 * with the RX/config path e.g. for 1506 * mesh. 1507 */ 1508 break; 1509 default: 1510 return -EBUSY; 1511 } 1512 1513 switch (type) { 1514 case NL80211_IFTYPE_AP: 1515 case NL80211_IFTYPE_STATION: 1516 case NL80211_IFTYPE_ADHOC: 1517 case NL80211_IFTYPE_OCB: 1518 /* 1519 * Could probably support everything 1520 * but WDS here (WDS do_open can fail 1521 * under memory pressure, which this 1522 * code isn't prepared to handle). 1523 */ 1524 break; 1525 case NL80211_IFTYPE_P2P_CLIENT: 1526 p2p = true; 1527 internal_type = NL80211_IFTYPE_STATION; 1528 break; 1529 case NL80211_IFTYPE_P2P_GO: 1530 p2p = true; 1531 internal_type = NL80211_IFTYPE_AP; 1532 break; 1533 default: 1534 return -EBUSY; 1535 } 1536 1537 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1538 if (ret) 1539 return ret; 1540 1541 ieee80211_do_stop(sdata, false); 1542 1543 ieee80211_teardown_sdata(sdata); 1544 1545 ret = drv_change_interface(local, sdata, internal_type, p2p); 1546 if (ret) 1547 type = ieee80211_vif_type_p2p(&sdata->vif); 1548 1549 /* 1550 * Ignore return value here, there's not much we can do since 1551 * the driver changed the interface type internally already. 1552 * The warnings will hopefully make driver authors fix it :-) 1553 */ 1554 ieee80211_check_queues(sdata, type); 1555 1556 ieee80211_setup_sdata(sdata, type); 1557 1558 err = ieee80211_do_open(&sdata->wdev, false); 1559 WARN(err, "type change: do_open returned %d", err); 1560 1561 return ret; 1562 } 1563 1564 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1565 enum nl80211_iftype type) 1566 { 1567 int ret; 1568 1569 ASSERT_RTNL(); 1570 1571 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1572 return 0; 1573 1574 if (ieee80211_sdata_running(sdata)) { 1575 ret = ieee80211_runtime_change_iftype(sdata, type); 1576 if (ret) 1577 return ret; 1578 } else { 1579 /* Purge and reset type-dependent state. */ 1580 ieee80211_teardown_sdata(sdata); 1581 ieee80211_setup_sdata(sdata, type); 1582 } 1583 1584 /* reset some values that shouldn't be kept across type changes */ 1585 if (type == NL80211_IFTYPE_STATION) 1586 sdata->u.mgd.use_4addr = false; 1587 1588 return 0; 1589 } 1590 1591 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1592 u8 *perm_addr, enum nl80211_iftype type) 1593 { 1594 struct ieee80211_sub_if_data *sdata; 1595 u64 mask, start, addr, val, inc; 1596 u8 *m; 1597 u8 tmp_addr[ETH_ALEN]; 1598 int i; 1599 1600 /* default ... something at least */ 1601 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1602 1603 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1604 local->hw.wiphy->n_addresses <= 1) 1605 return; 1606 1607 mutex_lock(&local->iflist_mtx); 1608 1609 switch (type) { 1610 case NL80211_IFTYPE_MONITOR: 1611 /* doesn't matter */ 1612 break; 1613 case NL80211_IFTYPE_WDS: 1614 case NL80211_IFTYPE_AP_VLAN: 1615 /* match up with an AP interface */ 1616 list_for_each_entry(sdata, &local->interfaces, list) { 1617 if (sdata->vif.type != NL80211_IFTYPE_AP) 1618 continue; 1619 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1620 break; 1621 } 1622 /* keep default if no AP interface present */ 1623 break; 1624 case NL80211_IFTYPE_P2P_CLIENT: 1625 case NL80211_IFTYPE_P2P_GO: 1626 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1627 list_for_each_entry(sdata, &local->interfaces, list) { 1628 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1629 continue; 1630 if (!ieee80211_sdata_running(sdata)) 1631 continue; 1632 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1633 goto out_unlock; 1634 } 1635 } 1636 /* otherwise fall through */ 1637 default: 1638 /* assign a new address if possible -- try n_addresses first */ 1639 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1640 bool used = false; 1641 1642 list_for_each_entry(sdata, &local->interfaces, list) { 1643 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1644 sdata->vif.addr)) { 1645 used = true; 1646 break; 1647 } 1648 } 1649 1650 if (!used) { 1651 memcpy(perm_addr, 1652 local->hw.wiphy->addresses[i].addr, 1653 ETH_ALEN); 1654 break; 1655 } 1656 } 1657 1658 /* try mask if available */ 1659 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1660 break; 1661 1662 m = local->hw.wiphy->addr_mask; 1663 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1664 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1665 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1666 1667 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1668 /* not a contiguous mask ... not handled now! */ 1669 pr_info("not contiguous\n"); 1670 break; 1671 } 1672 1673 /* 1674 * Pick address of existing interface in case user changed 1675 * MAC address manually, default to perm_addr. 1676 */ 1677 m = local->hw.wiphy->perm_addr; 1678 list_for_each_entry(sdata, &local->interfaces, list) { 1679 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1680 continue; 1681 m = sdata->vif.addr; 1682 break; 1683 } 1684 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1685 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1686 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1687 1688 inc = 1ULL<<__ffs64(mask); 1689 val = (start & mask); 1690 addr = (start & ~mask) | (val & mask); 1691 do { 1692 bool used = false; 1693 1694 tmp_addr[5] = addr >> 0*8; 1695 tmp_addr[4] = addr >> 1*8; 1696 tmp_addr[3] = addr >> 2*8; 1697 tmp_addr[2] = addr >> 3*8; 1698 tmp_addr[1] = addr >> 4*8; 1699 tmp_addr[0] = addr >> 5*8; 1700 1701 val += inc; 1702 1703 list_for_each_entry(sdata, &local->interfaces, list) { 1704 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1705 used = true; 1706 break; 1707 } 1708 } 1709 1710 if (!used) { 1711 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1712 break; 1713 } 1714 addr = (start & ~mask) | (val & mask); 1715 } while (addr != start); 1716 1717 break; 1718 } 1719 1720 out_unlock: 1721 mutex_unlock(&local->iflist_mtx); 1722 } 1723 1724 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1725 unsigned char name_assign_type, 1726 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1727 struct vif_params *params) 1728 { 1729 struct net_device *ndev = NULL; 1730 struct ieee80211_sub_if_data *sdata = NULL; 1731 struct txq_info *txqi; 1732 void (*if_setup)(struct net_device *dev); 1733 int ret, i; 1734 int txqs = 1; 1735 1736 ASSERT_RTNL(); 1737 1738 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 1739 struct wireless_dev *wdev; 1740 1741 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1742 GFP_KERNEL); 1743 if (!sdata) 1744 return -ENOMEM; 1745 wdev = &sdata->wdev; 1746 1747 sdata->dev = NULL; 1748 strlcpy(sdata->name, name, IFNAMSIZ); 1749 ieee80211_assign_perm_addr(local, wdev->address, type); 1750 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1751 } else { 1752 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 1753 sizeof(void *)); 1754 int txq_size = 0; 1755 1756 if (local->ops->wake_tx_queue) 1757 txq_size += sizeof(struct txq_info) + 1758 local->hw.txq_data_size; 1759 1760 if (local->ops->wake_tx_queue) 1761 if_setup = ieee80211_if_setup_no_queue; 1762 else 1763 if_setup = ieee80211_if_setup; 1764 1765 if (local->hw.queues >= IEEE80211_NUM_ACS) 1766 txqs = IEEE80211_NUM_ACS; 1767 1768 ndev = alloc_netdev_mqs(size + txq_size, 1769 name, name_assign_type, 1770 if_setup, txqs, 1); 1771 if (!ndev) 1772 return -ENOMEM; 1773 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1774 1775 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1776 if (!ndev->tstats) { 1777 free_netdev(ndev); 1778 return -ENOMEM; 1779 } 1780 1781 ndev->needed_headroom = local->tx_headroom + 1782 4*6 /* four MAC addresses */ 1783 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1784 + 6 /* mesh */ 1785 + 8 /* rfc1042/bridge tunnel */ 1786 - ETH_HLEN /* ethernet hard_header_len */ 1787 + IEEE80211_ENCRYPT_HEADROOM; 1788 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1789 1790 ret = dev_alloc_name(ndev, ndev->name); 1791 if (ret < 0) { 1792 ieee80211_if_free(ndev); 1793 return ret; 1794 } 1795 1796 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1797 if (params && is_valid_ether_addr(params->macaddr)) 1798 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN); 1799 else 1800 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1801 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1802 1803 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1804 sdata = netdev_priv(ndev); 1805 ndev->ieee80211_ptr = &sdata->wdev; 1806 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1807 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1808 1809 if (txq_size) { 1810 txqi = netdev_priv(ndev) + size; 1811 ieee80211_txq_init(sdata, NULL, txqi, 0); 1812 } 1813 1814 sdata->dev = ndev; 1815 } 1816 1817 /* initialise type-independent data */ 1818 sdata->wdev.wiphy = local->hw.wiphy; 1819 sdata->local = local; 1820 1821 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1822 skb_queue_head_init(&sdata->fragments[i].skb_list); 1823 1824 INIT_LIST_HEAD(&sdata->key_list); 1825 1826 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1827 ieee80211_dfs_cac_timer_work); 1828 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1829 ieee80211_delayed_tailroom_dec); 1830 1831 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1832 struct ieee80211_supported_band *sband; 1833 sband = local->hw.wiphy->bands[i]; 1834 sdata->rc_rateidx_mask[i] = 1835 sband ? (1 << sband->n_bitrates) - 1 : 0; 1836 if (sband) { 1837 __le16 cap; 1838 u16 *vht_rate_mask; 1839 1840 memcpy(sdata->rc_rateidx_mcs_mask[i], 1841 sband->ht_cap.mcs.rx_mask, 1842 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1843 1844 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 1845 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 1846 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 1847 } else { 1848 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1849 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1850 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 1851 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 1852 } 1853 } 1854 1855 ieee80211_set_default_queues(sdata); 1856 1857 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1858 sdata->user_power_level = local->user_power_level; 1859 1860 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1861 1862 /* setup type-dependent data */ 1863 ieee80211_setup_sdata(sdata, type); 1864 1865 if (ndev) { 1866 if (params) { 1867 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1868 if (type == NL80211_IFTYPE_STATION) 1869 sdata->u.mgd.use_4addr = params->use_4addr; 1870 } 1871 1872 ndev->features |= local->hw.netdev_features; 1873 1874 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 1875 1876 /* MTU range: 256 - 2304 */ 1877 ndev->min_mtu = 256; 1878 ndev->max_mtu = IEEE80211_MAX_DATA_LEN; 1879 1880 ret = register_netdevice(ndev); 1881 if (ret) { 1882 ieee80211_if_free(ndev); 1883 return ret; 1884 } 1885 } 1886 1887 mutex_lock(&local->iflist_mtx); 1888 list_add_tail_rcu(&sdata->list, &local->interfaces); 1889 mutex_unlock(&local->iflist_mtx); 1890 1891 if (new_wdev) 1892 *new_wdev = &sdata->wdev; 1893 1894 return 0; 1895 } 1896 1897 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1898 { 1899 ASSERT_RTNL(); 1900 1901 mutex_lock(&sdata->local->iflist_mtx); 1902 list_del_rcu(&sdata->list); 1903 mutex_unlock(&sdata->local->iflist_mtx); 1904 1905 synchronize_rcu(); 1906 1907 if (sdata->dev) { 1908 unregister_netdevice(sdata->dev); 1909 } else { 1910 cfg80211_unregister_wdev(&sdata->wdev); 1911 ieee80211_teardown_sdata(sdata); 1912 kfree(sdata); 1913 } 1914 } 1915 1916 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1917 { 1918 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1919 return; 1920 ieee80211_do_stop(sdata, true); 1921 } 1922 1923 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1924 { 1925 struct ieee80211_sub_if_data *sdata, *tmp; 1926 LIST_HEAD(unreg_list); 1927 LIST_HEAD(wdev_list); 1928 1929 ASSERT_RTNL(); 1930 1931 /* Before destroying the interfaces, make sure they're all stopped so 1932 * that the hardware is stopped. Otherwise, the driver might still be 1933 * iterating the interfaces during the shutdown, e.g. from a worker 1934 * or from RX processing or similar, and if it does so (using atomic 1935 * iteration) while we're manipulating the list, the iteration will 1936 * crash. 1937 * 1938 * After this, the hardware should be stopped and the driver should 1939 * have stopped all of its activities, so that we can do RCU-unaware 1940 * manipulations of the interface list below. 1941 */ 1942 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 1943 1944 WARN(local->open_count, "%s: open count remains %d\n", 1945 wiphy_name(local->hw.wiphy), local->open_count); 1946 1947 mutex_lock(&local->iflist_mtx); 1948 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1949 list_del(&sdata->list); 1950 1951 if (sdata->dev) 1952 unregister_netdevice_queue(sdata->dev, &unreg_list); 1953 else 1954 list_add(&sdata->list, &wdev_list); 1955 } 1956 mutex_unlock(&local->iflist_mtx); 1957 unregister_netdevice_many(&unreg_list); 1958 1959 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1960 list_del(&sdata->list); 1961 cfg80211_unregister_wdev(&sdata->wdev); 1962 kfree(sdata); 1963 } 1964 } 1965 1966 static int netdev_notify(struct notifier_block *nb, 1967 unsigned long state, void *ptr) 1968 { 1969 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1970 struct ieee80211_sub_if_data *sdata; 1971 1972 if (state != NETDEV_CHANGENAME) 1973 return NOTIFY_DONE; 1974 1975 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1976 return NOTIFY_DONE; 1977 1978 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1979 return NOTIFY_DONE; 1980 1981 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1982 memcpy(sdata->name, dev->name, IFNAMSIZ); 1983 ieee80211_debugfs_rename_netdev(sdata); 1984 1985 return NOTIFY_OK; 1986 } 1987 1988 static struct notifier_block mac80211_netdev_notifier = { 1989 .notifier_call = netdev_notify, 1990 }; 1991 1992 int ieee80211_iface_init(void) 1993 { 1994 return register_netdevice_notifier(&mac80211_netdev_notifier); 1995 } 1996 1997 void ieee80211_iface_exit(void) 1998 { 1999 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2000 } 2001 2002 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2003 { 2004 if (sdata->vif.type == NL80211_IFTYPE_AP) 2005 atomic_inc(&sdata->u.ap.num_mcast_sta); 2006 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2007 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2008 } 2009 2010 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2011 { 2012 if (sdata->vif.type == NL80211_IFTYPE_AP) 2013 atomic_dec(&sdata->u.ap.num_mcast_sta); 2014 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2015 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2016 } 2017