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 * Copyright (c) 2016 Intel Deutschland GmbH 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 #include <linux/slab.h> 16 #include <linux/kernel.h> 17 #include <linux/if_arp.h> 18 #include <linux/netdevice.h> 19 #include <linux/rtnetlink.h> 20 #include <net/mac80211.h> 21 #include <net/ieee80211_radiotap.h> 22 #include "ieee80211_i.h" 23 #include "sta_info.h" 24 #include "debugfs_netdev.h" 25 #include "mesh.h" 26 #include "led.h" 27 #include "driver-ops.h" 28 #include "wme.h" 29 #include "rate.h" 30 31 /** 32 * DOC: Interface list locking 33 * 34 * The interface list in each struct ieee80211_local is protected 35 * three-fold: 36 * 37 * (1) modifications may only be done under the RTNL 38 * (2) modifications and readers are protected against each other by 39 * the iflist_mtx. 40 * (3) modifications are done in an RCU manner so atomic readers 41 * can traverse the list in RCU-safe blocks. 42 * 43 * As a consequence, reads (traversals) of the list can be protected 44 * by either the RTNL, the iflist_mtx or RCU. 45 */ 46 47 static void ieee80211_iface_work(struct work_struct *work); 48 49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 50 { 51 struct ieee80211_chanctx_conf *chanctx_conf; 52 int power; 53 54 rcu_read_lock(); 55 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 56 if (!chanctx_conf) { 57 rcu_read_unlock(); 58 return false; 59 } 60 61 power = ieee80211_chandef_max_power(&chanctx_conf->def); 62 rcu_read_unlock(); 63 64 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 65 power = min(power, sdata->user_power_level); 66 67 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 68 power = min(power, sdata->ap_power_level); 69 70 if (power != sdata->vif.bss_conf.txpower) { 71 sdata->vif.bss_conf.txpower = power; 72 ieee80211_hw_config(sdata->local, 0); 73 return true; 74 } 75 76 return false; 77 } 78 79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 80 bool update_bss) 81 { 82 if (__ieee80211_recalc_txpower(sdata) || 83 (update_bss && ieee80211_sdata_running(sdata))) 84 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 85 } 86 87 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 88 { 89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 90 return 0; 91 92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 93 return IEEE80211_CONF_CHANGE_IDLE; 94 } 95 96 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 97 { 98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 99 return 0; 100 101 ieee80211_flush_queues(local, NULL, false); 102 103 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 104 return IEEE80211_CONF_CHANGE_IDLE; 105 } 106 107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 108 bool force_active) 109 { 110 bool working, scanning, active; 111 unsigned int led_trig_start = 0, led_trig_stop = 0; 112 113 lockdep_assert_held(&local->mtx); 114 115 active = force_active || 116 !list_empty(&local->chanctx_list) || 117 local->monitors; 118 119 working = !local->ops->remain_on_channel && 120 !list_empty(&local->roc_list); 121 122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 124 125 if (working || scanning) 126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 127 else 128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 129 130 if (active) 131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 132 else 133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 134 135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 136 137 if (working || scanning || active) 138 return __ieee80211_idle_off(local); 139 return __ieee80211_idle_on(local); 140 } 141 142 u32 ieee80211_idle_off(struct ieee80211_local *local) 143 { 144 return __ieee80211_recalc_idle(local, true); 145 } 146 147 void ieee80211_recalc_idle(struct ieee80211_local *local) 148 { 149 u32 change = __ieee80211_recalc_idle(local, false); 150 if (change) 151 ieee80211_hw_config(local, change); 152 } 153 154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 155 bool check_dup) 156 { 157 struct ieee80211_local *local = sdata->local; 158 struct ieee80211_sub_if_data *iter; 159 u64 new, mask, tmp; 160 u8 *m; 161 int ret = 0; 162 163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 164 return 0; 165 166 m = addr; 167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 170 171 m = local->hw.wiphy->addr_mask; 172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 175 176 if (!check_dup) 177 return ret; 178 179 mutex_lock(&local->iflist_mtx); 180 list_for_each_entry(iter, &local->interfaces, list) { 181 if (iter == sdata) 182 continue; 183 184 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 186 continue; 187 188 m = iter->vif.addr; 189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 192 193 if ((new & ~mask) != (tmp & ~mask)) { 194 ret = -EINVAL; 195 break; 196 } 197 } 198 mutex_unlock(&local->iflist_mtx); 199 200 return ret; 201 } 202 203 static int ieee80211_change_mac(struct net_device *dev, void *addr) 204 { 205 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 206 struct sockaddr *sa = addr; 207 bool check_dup = true; 208 int ret; 209 210 if (ieee80211_sdata_running(sdata)) 211 return -EBUSY; 212 213 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 214 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 215 check_dup = false; 216 217 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 218 if (ret) 219 return ret; 220 221 ret = eth_mac_addr(dev, sa); 222 223 if (ret == 0) 224 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 225 226 return ret; 227 } 228 229 static inline int identical_mac_addr_allowed(int type1, int type2) 230 { 231 return type1 == NL80211_IFTYPE_MONITOR || 232 type2 == NL80211_IFTYPE_MONITOR || 233 type1 == NL80211_IFTYPE_P2P_DEVICE || 234 type2 == NL80211_IFTYPE_P2P_DEVICE || 235 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 236 (type1 == NL80211_IFTYPE_WDS && 237 (type2 == NL80211_IFTYPE_WDS || 238 type2 == NL80211_IFTYPE_AP)) || 239 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 240 (type1 == NL80211_IFTYPE_AP_VLAN && 241 (type2 == NL80211_IFTYPE_AP || 242 type2 == NL80211_IFTYPE_AP_VLAN)); 243 } 244 245 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 246 enum nl80211_iftype iftype) 247 { 248 struct ieee80211_local *local = sdata->local; 249 struct ieee80211_sub_if_data *nsdata; 250 int ret; 251 252 ASSERT_RTNL(); 253 254 /* we hold the RTNL here so can safely walk the list */ 255 list_for_each_entry(nsdata, &local->interfaces, list) { 256 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 257 /* 258 * Only OCB and monitor mode may coexist 259 */ 260 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 261 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 262 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 263 nsdata->vif.type == NL80211_IFTYPE_OCB)) 264 return -EBUSY; 265 266 /* 267 * Allow only a single IBSS interface to be up at any 268 * time. This is restricted because beacon distribution 269 * cannot work properly if both are in the same IBSS. 270 * 271 * To remove this restriction we'd have to disallow them 272 * from setting the same SSID on different IBSS interfaces 273 * belonging to the same hardware. Then, however, we're 274 * faced with having to adopt two different TSF timers... 275 */ 276 if (iftype == NL80211_IFTYPE_ADHOC && 277 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 278 return -EBUSY; 279 /* 280 * will not add another interface while any channel 281 * switch is active. 282 */ 283 if (nsdata->vif.csa_active) 284 return -EBUSY; 285 286 /* 287 * The remaining checks are only performed for interfaces 288 * with the same MAC address. 289 */ 290 if (!ether_addr_equal(sdata->vif.addr, 291 nsdata->vif.addr)) 292 continue; 293 294 /* 295 * check whether it may have the same address 296 */ 297 if (!identical_mac_addr_allowed(iftype, 298 nsdata->vif.type)) 299 return -ENOTUNIQ; 300 301 /* 302 * can only add VLANs to enabled APs 303 */ 304 if (iftype == NL80211_IFTYPE_AP_VLAN && 305 nsdata->vif.type == NL80211_IFTYPE_AP) 306 sdata->bss = &nsdata->u.ap; 307 } 308 } 309 310 mutex_lock(&local->chanctx_mtx); 311 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 312 mutex_unlock(&local->chanctx_mtx); 313 return ret; 314 } 315 316 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 317 enum nl80211_iftype iftype) 318 { 319 int n_queues = sdata->local->hw.queues; 320 int i; 321 322 if (iftype == NL80211_IFTYPE_NAN) 323 return 0; 324 325 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 326 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 327 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 328 IEEE80211_INVAL_HW_QUEUE)) 329 return -EINVAL; 330 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 331 n_queues)) 332 return -EINVAL; 333 } 334 } 335 336 if ((iftype != NL80211_IFTYPE_AP && 337 iftype != NL80211_IFTYPE_P2P_GO && 338 iftype != NL80211_IFTYPE_MESH_POINT) || 339 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) { 340 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 341 return 0; 342 } 343 344 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 345 return -EINVAL; 346 347 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 348 return -EINVAL; 349 350 return 0; 351 } 352 353 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 354 const int offset) 355 { 356 struct ieee80211_local *local = sdata->local; 357 u32 flags = sdata->u.mntr.flags; 358 359 #define ADJUST(_f, _s) do { \ 360 if (flags & MONITOR_FLAG_##_f) \ 361 local->fif_##_s += offset; \ 362 } while (0) 363 364 ADJUST(FCSFAIL, fcsfail); 365 ADJUST(PLCPFAIL, plcpfail); 366 ADJUST(CONTROL, control); 367 ADJUST(CONTROL, pspoll); 368 ADJUST(OTHER_BSS, other_bss); 369 370 #undef ADJUST 371 } 372 373 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 374 { 375 struct ieee80211_local *local = sdata->local; 376 int i; 377 378 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 379 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 380 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 381 else if (local->hw.queues >= IEEE80211_NUM_ACS) 382 sdata->vif.hw_queue[i] = i; 383 else 384 sdata->vif.hw_queue[i] = 0; 385 } 386 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 387 } 388 389 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 390 { 391 struct ieee80211_sub_if_data *sdata; 392 int ret; 393 394 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) 395 return 0; 396 397 ASSERT_RTNL(); 398 399 if (local->monitor_sdata) 400 return 0; 401 402 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 403 if (!sdata) 404 return -ENOMEM; 405 406 /* set up data */ 407 sdata->local = local; 408 sdata->vif.type = NL80211_IFTYPE_MONITOR; 409 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 410 wiphy_name(local->hw.wiphy)); 411 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 412 413 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 414 415 ieee80211_set_default_queues(sdata); 416 417 ret = drv_add_interface(local, sdata); 418 if (WARN_ON(ret)) { 419 /* ok .. stupid driver, it asked for this! */ 420 kfree(sdata); 421 return ret; 422 } 423 424 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 425 if (ret) { 426 kfree(sdata); 427 return ret; 428 } 429 430 mutex_lock(&local->iflist_mtx); 431 rcu_assign_pointer(local->monitor_sdata, sdata); 432 mutex_unlock(&local->iflist_mtx); 433 434 mutex_lock(&local->mtx); 435 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 436 IEEE80211_CHANCTX_EXCLUSIVE); 437 mutex_unlock(&local->mtx); 438 if (ret) { 439 mutex_lock(&local->iflist_mtx); 440 RCU_INIT_POINTER(local->monitor_sdata, NULL); 441 mutex_unlock(&local->iflist_mtx); 442 synchronize_net(); 443 drv_remove_interface(local, sdata); 444 kfree(sdata); 445 return ret; 446 } 447 448 skb_queue_head_init(&sdata->skb_queue); 449 INIT_WORK(&sdata->work, ieee80211_iface_work); 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 case NL80211_IFTYPE_NAN: 544 /* no special treatment */ 545 break; 546 case NL80211_IFTYPE_UNSPECIFIED: 547 case NUM_NL80211_IFTYPES: 548 case NL80211_IFTYPE_P2P_CLIENT: 549 case NL80211_IFTYPE_P2P_GO: 550 /* cannot happen */ 551 WARN_ON(1); 552 break; 553 } 554 555 if (local->open_count == 0) { 556 res = drv_start(local); 557 if (res) 558 goto err_del_bss; 559 /* we're brought up, everything changes */ 560 hw_reconf_flags = ~0; 561 ieee80211_led_radio(local, true); 562 ieee80211_mod_tpt_led_trig(local, 563 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 564 } 565 566 /* 567 * Copy the hopefully now-present MAC address to 568 * this interface, if it has the special null one. 569 */ 570 if (dev && is_zero_ether_addr(dev->dev_addr)) { 571 memcpy(dev->dev_addr, 572 local->hw.wiphy->perm_addr, 573 ETH_ALEN); 574 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 575 576 if (!is_valid_ether_addr(dev->dev_addr)) { 577 res = -EADDRNOTAVAIL; 578 goto err_stop; 579 } 580 } 581 582 switch (sdata->vif.type) { 583 case NL80211_IFTYPE_AP_VLAN: 584 /* no need to tell driver, but set carrier and chanctx */ 585 if (rtnl_dereference(sdata->bss->beacon)) { 586 ieee80211_vif_vlan_copy_chanctx(sdata); 587 netif_carrier_on(dev); 588 } else { 589 netif_carrier_off(dev); 590 } 591 break; 592 case NL80211_IFTYPE_MONITOR: 593 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 594 local->cooked_mntrs++; 595 break; 596 } 597 598 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 599 res = drv_add_interface(local, sdata); 600 if (res) 601 goto err_stop; 602 } else if (local->monitors == 0 && local->open_count == 0) { 603 res = ieee80211_add_virtual_monitor(local); 604 if (res) 605 goto err_stop; 606 } 607 608 /* must be before the call to ieee80211_configure_filter */ 609 local->monitors++; 610 if (local->monitors == 1) { 611 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 612 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 613 } 614 615 ieee80211_adjust_monitor_flags(sdata, 1); 616 ieee80211_configure_filter(local); 617 mutex_lock(&local->mtx); 618 ieee80211_recalc_idle(local); 619 mutex_unlock(&local->mtx); 620 621 netif_carrier_on(dev); 622 break; 623 default: 624 if (coming_up) { 625 ieee80211_del_virtual_monitor(local); 626 627 res = drv_add_interface(local, sdata); 628 if (res) 629 goto err_stop; 630 res = ieee80211_check_queues(sdata, 631 ieee80211_vif_type_p2p(&sdata->vif)); 632 if (res) 633 goto err_del_interface; 634 } 635 636 if (sdata->vif.type == NL80211_IFTYPE_AP) { 637 local->fif_pspoll++; 638 local->fif_probe_req++; 639 640 ieee80211_configure_filter(local); 641 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 642 local->fif_probe_req++; 643 } 644 645 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 646 sdata->vif.type != NL80211_IFTYPE_NAN) 647 changed |= ieee80211_reset_erp_info(sdata); 648 ieee80211_bss_info_change_notify(sdata, changed); 649 650 switch (sdata->vif.type) { 651 case NL80211_IFTYPE_STATION: 652 case NL80211_IFTYPE_ADHOC: 653 case NL80211_IFTYPE_AP: 654 case NL80211_IFTYPE_MESH_POINT: 655 case NL80211_IFTYPE_OCB: 656 netif_carrier_off(dev); 657 break; 658 case NL80211_IFTYPE_WDS: 659 case NL80211_IFTYPE_P2P_DEVICE: 660 case NL80211_IFTYPE_NAN: 661 break; 662 default: 663 /* not reached */ 664 WARN_ON(1); 665 } 666 667 /* 668 * Set default queue parameters so drivers don't 669 * need to initialise the hardware if the hardware 670 * doesn't start up with sane defaults. 671 * Enable QoS for anything but station interfaces. 672 */ 673 ieee80211_set_wmm_default(sdata, true, 674 sdata->vif.type != NL80211_IFTYPE_STATION); 675 } 676 677 set_bit(SDATA_STATE_RUNNING, &sdata->state); 678 679 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 680 /* Create STA entry for the WDS peer */ 681 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 682 GFP_KERNEL); 683 if (!sta) { 684 res = -ENOMEM; 685 goto err_del_interface; 686 } 687 688 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 689 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 690 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 691 692 res = sta_info_insert(sta); 693 if (res) { 694 /* STA has been freed */ 695 goto err_del_interface; 696 } 697 698 rate_control_rate_init(sta); 699 netif_carrier_on(dev); 700 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 701 rcu_assign_pointer(local->p2p_sdata, sdata); 702 } 703 704 /* 705 * set_multicast_list will be invoked by the networking core 706 * which will check whether any increments here were done in 707 * error and sync them down to the hardware as filter flags. 708 */ 709 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 710 atomic_inc(&local->iff_allmultis); 711 712 if (coming_up) 713 local->open_count++; 714 715 if (hw_reconf_flags) 716 ieee80211_hw_config(local, hw_reconf_flags); 717 718 ieee80211_recalc_ps(local); 719 720 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 721 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 722 local->ops->wake_tx_queue) { 723 /* XXX: for AP_VLAN, actually track AP queues */ 724 netif_tx_start_all_queues(dev); 725 } else if (dev) { 726 unsigned long flags; 727 int n_acs = IEEE80211_NUM_ACS; 728 int ac; 729 730 if (local->hw.queues < IEEE80211_NUM_ACS) 731 n_acs = 1; 732 733 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 734 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 735 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 736 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 737 for (ac = 0; ac < n_acs; ac++) { 738 int ac_queue = sdata->vif.hw_queue[ac]; 739 740 if (local->queue_stop_reasons[ac_queue] == 0 && 741 skb_queue_empty(&local->pending[ac_queue])) 742 netif_start_subqueue(dev, ac); 743 } 744 } 745 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 746 } 747 748 return 0; 749 err_del_interface: 750 drv_remove_interface(local, sdata); 751 err_stop: 752 if (!local->open_count) 753 drv_stop(local); 754 err_del_bss: 755 sdata->bss = NULL; 756 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 757 mutex_lock(&local->mtx); 758 list_del(&sdata->u.vlan.list); 759 mutex_unlock(&local->mtx); 760 } 761 /* might already be clear but that doesn't matter */ 762 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 763 return res; 764 } 765 766 static int ieee80211_open(struct net_device *dev) 767 { 768 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 769 int err; 770 771 /* fail early if user set an invalid address */ 772 if (!is_valid_ether_addr(dev->dev_addr)) 773 return -EADDRNOTAVAIL; 774 775 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 776 if (err) 777 return err; 778 779 return ieee80211_do_open(&sdata->wdev, true); 780 } 781 782 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 783 bool going_down) 784 { 785 struct ieee80211_local *local = sdata->local; 786 struct fq *fq = &local->fq; 787 unsigned long flags; 788 struct sk_buff *skb, *tmp; 789 u32 hw_reconf_flags = 0; 790 int i, flushed; 791 struct ps_data *ps; 792 struct cfg80211_chan_def chandef; 793 bool cancel_scan; 794 struct cfg80211_nan_func *func; 795 796 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 797 798 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 799 if (cancel_scan) 800 ieee80211_scan_cancel(local); 801 802 /* 803 * Stop TX on this interface first. 804 */ 805 if (sdata->dev) 806 netif_tx_stop_all_queues(sdata->dev); 807 808 ieee80211_roc_purge(local, sdata); 809 810 switch (sdata->vif.type) { 811 case NL80211_IFTYPE_STATION: 812 ieee80211_mgd_stop(sdata); 813 break; 814 case NL80211_IFTYPE_ADHOC: 815 ieee80211_ibss_stop(sdata); 816 break; 817 case NL80211_IFTYPE_AP: 818 cancel_work_sync(&sdata->u.ap.request_smps_work); 819 break; 820 default: 821 break; 822 } 823 824 /* 825 * Remove all stations associated with this interface. 826 * 827 * This must be done before calling ops->remove_interface() 828 * because otherwise we can later invoke ops->sta_notify() 829 * whenever the STAs are removed, and that invalidates driver 830 * assumptions about always getting a vif pointer that is valid 831 * (because if we remove a STA after ops->remove_interface() 832 * the driver will have removed the vif info already!) 833 * 834 * In WDS mode a station must exist here and be flushed, for 835 * AP_VLANs stations may exist since there's nothing else that 836 * would have removed them, but in other modes there shouldn't 837 * be any stations. 838 */ 839 flushed = sta_info_flush(sdata); 840 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 841 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 842 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1))); 843 844 /* don't count this interface for allmulti while it is down */ 845 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 846 atomic_dec(&local->iff_allmultis); 847 848 if (sdata->vif.type == NL80211_IFTYPE_AP) { 849 local->fif_pspoll--; 850 local->fif_probe_req--; 851 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 852 local->fif_probe_req--; 853 } 854 855 if (sdata->dev) { 856 netif_addr_lock_bh(sdata->dev); 857 spin_lock_bh(&local->filter_lock); 858 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 859 sdata->dev->addr_len); 860 spin_unlock_bh(&local->filter_lock); 861 netif_addr_unlock_bh(sdata->dev); 862 } 863 864 del_timer_sync(&local->dynamic_ps_timer); 865 cancel_work_sync(&local->dynamic_ps_enable_work); 866 867 cancel_work_sync(&sdata->recalc_smps); 868 sdata_lock(sdata); 869 mutex_lock(&local->mtx); 870 sdata->vif.csa_active = false; 871 if (sdata->vif.type == NL80211_IFTYPE_STATION) 872 sdata->u.mgd.csa_waiting_bcn = false; 873 if (sdata->csa_block_tx) { 874 ieee80211_wake_vif_queues(local, sdata, 875 IEEE80211_QUEUE_STOP_REASON_CSA); 876 sdata->csa_block_tx = false; 877 } 878 mutex_unlock(&local->mtx); 879 sdata_unlock(sdata); 880 881 cancel_work_sync(&sdata->csa_finalize_work); 882 883 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 884 885 if (sdata->wdev.cac_started) { 886 chandef = sdata->vif.bss_conf.chandef; 887 WARN_ON(local->suspended); 888 mutex_lock(&local->mtx); 889 ieee80211_vif_release_channel(sdata); 890 mutex_unlock(&local->mtx); 891 cfg80211_cac_event(sdata->dev, &chandef, 892 NL80211_RADAR_CAC_ABORTED, 893 GFP_KERNEL); 894 } 895 896 /* APs need special treatment */ 897 if (sdata->vif.type == NL80211_IFTYPE_AP) { 898 struct ieee80211_sub_if_data *vlan, *tmpsdata; 899 900 /* down all dependent devices, that is VLANs */ 901 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 902 u.vlan.list) 903 dev_close(vlan->dev); 904 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 905 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 906 /* remove all packets in parent bc_buf pointing to this dev */ 907 ps = &sdata->bss->ps; 908 909 spin_lock_irqsave(&ps->bc_buf.lock, flags); 910 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 911 if (skb->dev == sdata->dev) { 912 __skb_unlink(skb, &ps->bc_buf); 913 local->total_ps_buffered--; 914 ieee80211_free_txskb(&local->hw, skb); 915 } 916 } 917 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 918 } 919 920 if (going_down) 921 local->open_count--; 922 923 switch (sdata->vif.type) { 924 case NL80211_IFTYPE_AP_VLAN: 925 mutex_lock(&local->mtx); 926 list_del(&sdata->u.vlan.list); 927 mutex_unlock(&local->mtx); 928 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 929 /* see comment in the default case below */ 930 ieee80211_free_keys(sdata, true); 931 /* no need to tell driver */ 932 break; 933 case NL80211_IFTYPE_MONITOR: 934 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) { 935 local->cooked_mntrs--; 936 break; 937 } 938 939 local->monitors--; 940 if (local->monitors == 0) { 941 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 942 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 943 } 944 945 ieee80211_adjust_monitor_flags(sdata, -1); 946 break; 947 case NL80211_IFTYPE_NAN: 948 /* clean all the functions */ 949 spin_lock_bh(&sdata->u.nan.func_lock); 950 951 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) { 952 idr_remove(&sdata->u.nan.function_inst_ids, i); 953 cfg80211_free_nan_func(func); 954 } 955 idr_destroy(&sdata->u.nan.function_inst_ids); 956 957 spin_unlock_bh(&sdata->u.nan.func_lock); 958 break; 959 case NL80211_IFTYPE_P2P_DEVICE: 960 /* relies on synchronize_rcu() below */ 961 RCU_INIT_POINTER(local->p2p_sdata, NULL); 962 /* fall through */ 963 default: 964 cancel_work_sync(&sdata->work); 965 /* 966 * When we get here, the interface is marked down. 967 * Free the remaining keys, if there are any 968 * (which can happen in AP mode if userspace sets 969 * keys before the interface is operating, and maybe 970 * also in WDS mode) 971 * 972 * Force the key freeing to always synchronize_net() 973 * to wait for the RX path in case it is using this 974 * interface enqueuing frames at this very time on 975 * another CPU. 976 */ 977 ieee80211_free_keys(sdata, true); 978 skb_queue_purge(&sdata->skb_queue); 979 } 980 981 sdata->bss = NULL; 982 983 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 984 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 985 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 986 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 987 if (info->control.vif == &sdata->vif) { 988 __skb_unlink(skb, &local->pending[i]); 989 ieee80211_free_txskb(&local->hw, skb); 990 } 991 } 992 } 993 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 994 995 if (sdata->vif.txq) { 996 struct txq_info *txqi = to_txq_info(sdata->vif.txq); 997 998 spin_lock_bh(&fq->lock); 999 ieee80211_txq_purge(local, txqi); 1000 spin_unlock_bh(&fq->lock); 1001 } 1002 1003 if (local->open_count == 0) 1004 ieee80211_clear_tx_pending(local); 1005 1006 /* 1007 * If the interface goes down while suspended, presumably because 1008 * the device was unplugged and that happens before our resume, 1009 * then the driver is already unconfigured and the remainder of 1010 * this function isn't needed. 1011 * XXX: what about WoWLAN? If the device has software state, e.g. 1012 * memory allocated, it might expect teardown commands from 1013 * mac80211 here? 1014 */ 1015 if (local->suspended) { 1016 WARN_ON(local->wowlan); 1017 WARN_ON(rtnl_dereference(local->monitor_sdata)); 1018 return; 1019 } 1020 1021 switch (sdata->vif.type) { 1022 case NL80211_IFTYPE_AP_VLAN: 1023 break; 1024 case NL80211_IFTYPE_MONITOR: 1025 if (local->monitors == 0) 1026 ieee80211_del_virtual_monitor(local); 1027 1028 mutex_lock(&local->mtx); 1029 ieee80211_recalc_idle(local); 1030 mutex_unlock(&local->mtx); 1031 1032 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE)) 1033 break; 1034 1035 /* fall through */ 1036 default: 1037 if (going_down) 1038 drv_remove_interface(local, sdata); 1039 } 1040 1041 ieee80211_recalc_ps(local); 1042 1043 if (cancel_scan) 1044 flush_delayed_work(&local->scan_work); 1045 1046 if (local->open_count == 0) { 1047 ieee80211_stop_device(local); 1048 1049 /* no reconfiguring after stop! */ 1050 return; 1051 } 1052 1053 /* do after stop to avoid reconfiguring when we stop anyway */ 1054 ieee80211_configure_filter(local); 1055 ieee80211_hw_config(local, hw_reconf_flags); 1056 1057 if (local->monitors == local->open_count) 1058 ieee80211_add_virtual_monitor(local); 1059 } 1060 1061 static int ieee80211_stop(struct net_device *dev) 1062 { 1063 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1064 1065 ieee80211_do_stop(sdata, true); 1066 1067 return 0; 1068 } 1069 1070 static void ieee80211_set_multicast_list(struct net_device *dev) 1071 { 1072 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1073 struct ieee80211_local *local = sdata->local; 1074 int allmulti, sdata_allmulti; 1075 1076 allmulti = !!(dev->flags & IFF_ALLMULTI); 1077 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1078 1079 if (allmulti != sdata_allmulti) { 1080 if (dev->flags & IFF_ALLMULTI) 1081 atomic_inc(&local->iff_allmultis); 1082 else 1083 atomic_dec(&local->iff_allmultis); 1084 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1085 } 1086 1087 spin_lock_bh(&local->filter_lock); 1088 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1089 spin_unlock_bh(&local->filter_lock); 1090 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1091 } 1092 1093 /* 1094 * Called when the netdev is removed or, by the code below, before 1095 * the interface type changes. 1096 */ 1097 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1098 { 1099 int i; 1100 1101 /* free extra data */ 1102 ieee80211_free_keys(sdata, false); 1103 1104 ieee80211_debugfs_remove_netdev(sdata); 1105 1106 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1107 __skb_queue_purge(&sdata->fragments[i].skb_list); 1108 sdata->fragment_next = 0; 1109 1110 if (ieee80211_vif_is_mesh(&sdata->vif)) 1111 ieee80211_mesh_teardown_sdata(sdata); 1112 } 1113 1114 static void ieee80211_uninit(struct net_device *dev) 1115 { 1116 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1117 } 1118 1119 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1120 struct sk_buff *skb, 1121 void *accel_priv, 1122 select_queue_fallback_t fallback) 1123 { 1124 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1125 } 1126 1127 static void 1128 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 1129 { 1130 int i; 1131 1132 for_each_possible_cpu(i) { 1133 const struct pcpu_sw_netstats *tstats; 1134 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1135 unsigned int start; 1136 1137 tstats = per_cpu_ptr(dev->tstats, i); 1138 1139 do { 1140 start = u64_stats_fetch_begin_irq(&tstats->syncp); 1141 rx_packets = tstats->rx_packets; 1142 tx_packets = tstats->tx_packets; 1143 rx_bytes = tstats->rx_bytes; 1144 tx_bytes = tstats->tx_bytes; 1145 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 1146 1147 stats->rx_packets += rx_packets; 1148 stats->tx_packets += tx_packets; 1149 stats->rx_bytes += rx_bytes; 1150 stats->tx_bytes += tx_bytes; 1151 } 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_OPMODE_NOTIF: { 1299 struct ieee80211_rx_status *status; 1300 enum nl80211_band band; 1301 u8 opmode; 1302 1303 status = IEEE80211_SKB_RXCB(skb); 1304 band = status->band; 1305 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; 1306 1307 mutex_lock(&local->sta_mtx); 1308 sta = sta_info_get_bss(sdata, mgmt->sa); 1309 1310 if (sta) 1311 ieee80211_vht_handle_opmode(sdata, sta, 1312 opmode, 1313 band); 1314 1315 mutex_unlock(&local->sta_mtx); 1316 break; 1317 } 1318 case WLAN_VHT_ACTION_GROUPID_MGMT: 1319 ieee80211_process_mu_groups(sdata, mgmt); 1320 break; 1321 default: 1322 WARN_ON(1); 1323 break; 1324 } 1325 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1326 struct ieee80211_hdr *hdr = (void *)mgmt; 1327 /* 1328 * So the frame isn't mgmt, but frame_control 1329 * is at the right place anyway, of course, so 1330 * the if statement is correct. 1331 * 1332 * Warn if we have other data frame types here, 1333 * they must not get here. 1334 */ 1335 WARN_ON(hdr->frame_control & 1336 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1337 WARN_ON(!(hdr->seq_ctrl & 1338 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1339 /* 1340 * This was a fragment of a frame, received while 1341 * a block-ack session was active. That cannot be 1342 * right, so terminate the session. 1343 */ 1344 mutex_lock(&local->sta_mtx); 1345 sta = sta_info_get_bss(sdata, mgmt->sa); 1346 if (sta) { 1347 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1348 IEEE80211_QOS_CTL_TID_MASK; 1349 1350 __ieee80211_stop_rx_ba_session( 1351 sta, tid, WLAN_BACK_RECIPIENT, 1352 WLAN_REASON_QSTA_REQUIRE_SETUP, 1353 true); 1354 } 1355 mutex_unlock(&local->sta_mtx); 1356 } else switch (sdata->vif.type) { 1357 case NL80211_IFTYPE_STATION: 1358 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1359 break; 1360 case NL80211_IFTYPE_ADHOC: 1361 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1362 break; 1363 case NL80211_IFTYPE_MESH_POINT: 1364 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1365 break; 1366 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1367 break; 1368 default: 1369 WARN(1, "frame for unexpected interface type"); 1370 break; 1371 } 1372 1373 kfree_skb(skb); 1374 } 1375 1376 /* then other type-dependent work */ 1377 switch (sdata->vif.type) { 1378 case NL80211_IFTYPE_STATION: 1379 ieee80211_sta_work(sdata); 1380 break; 1381 case NL80211_IFTYPE_ADHOC: 1382 ieee80211_ibss_work(sdata); 1383 break; 1384 case NL80211_IFTYPE_MESH_POINT: 1385 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1386 break; 1387 ieee80211_mesh_work(sdata); 1388 break; 1389 case NL80211_IFTYPE_OCB: 1390 ieee80211_ocb_work(sdata); 1391 break; 1392 default: 1393 break; 1394 } 1395 } 1396 1397 static void ieee80211_recalc_smps_work(struct work_struct *work) 1398 { 1399 struct ieee80211_sub_if_data *sdata = 1400 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1401 1402 ieee80211_recalc_smps(sdata); 1403 } 1404 1405 /* 1406 * Helper function to initialise an interface to a specific type. 1407 */ 1408 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1409 enum nl80211_iftype type) 1410 { 1411 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1412 0xff, 0xff, 0xff}; 1413 1414 /* clear type-dependent union */ 1415 memset(&sdata->u, 0, sizeof(sdata->u)); 1416 1417 /* and set some type-dependent values */ 1418 sdata->vif.type = type; 1419 sdata->vif.p2p = false; 1420 sdata->wdev.iftype = type; 1421 1422 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1423 sdata->control_port_no_encrypt = false; 1424 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1425 sdata->vif.bss_conf.idle = true; 1426 1427 sdata->noack_map = 0; 1428 1429 /* only monitor/p2p-device differ */ 1430 if (sdata->dev) { 1431 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1432 sdata->dev->type = ARPHRD_ETHER; 1433 } 1434 1435 skb_queue_head_init(&sdata->skb_queue); 1436 INIT_WORK(&sdata->work, ieee80211_iface_work); 1437 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1438 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1439 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1440 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1441 1442 switch (type) { 1443 case NL80211_IFTYPE_P2P_GO: 1444 type = NL80211_IFTYPE_AP; 1445 sdata->vif.type = type; 1446 sdata->vif.p2p = true; 1447 /* fall through */ 1448 case NL80211_IFTYPE_AP: 1449 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1450 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1451 INIT_WORK(&sdata->u.ap.request_smps_work, 1452 ieee80211_request_smps_ap_work); 1453 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1454 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1455 break; 1456 case NL80211_IFTYPE_P2P_CLIENT: 1457 type = NL80211_IFTYPE_STATION; 1458 sdata->vif.type = type; 1459 sdata->vif.p2p = true; 1460 /* fall through */ 1461 case NL80211_IFTYPE_STATION: 1462 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1463 ieee80211_sta_setup_sdata(sdata); 1464 break; 1465 case NL80211_IFTYPE_OCB: 1466 sdata->vif.bss_conf.bssid = bssid_wildcard; 1467 ieee80211_ocb_setup_sdata(sdata); 1468 break; 1469 case NL80211_IFTYPE_ADHOC: 1470 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1471 ieee80211_ibss_setup_sdata(sdata); 1472 break; 1473 case NL80211_IFTYPE_MESH_POINT: 1474 if (ieee80211_vif_is_mesh(&sdata->vif)) 1475 ieee80211_mesh_init_sdata(sdata); 1476 break; 1477 case NL80211_IFTYPE_MONITOR: 1478 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1479 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1480 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL | 1481 MONITOR_FLAG_OTHER_BSS; 1482 break; 1483 case NL80211_IFTYPE_WDS: 1484 sdata->vif.bss_conf.bssid = NULL; 1485 break; 1486 case NL80211_IFTYPE_NAN: 1487 idr_init(&sdata->u.nan.function_inst_ids); 1488 spin_lock_init(&sdata->u.nan.func_lock); 1489 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1490 break; 1491 case NL80211_IFTYPE_AP_VLAN: 1492 case NL80211_IFTYPE_P2P_DEVICE: 1493 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1494 break; 1495 case NL80211_IFTYPE_UNSPECIFIED: 1496 case NUM_NL80211_IFTYPES: 1497 BUG(); 1498 break; 1499 } 1500 1501 ieee80211_debugfs_add_netdev(sdata); 1502 } 1503 1504 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1505 enum nl80211_iftype type) 1506 { 1507 struct ieee80211_local *local = sdata->local; 1508 int ret, err; 1509 enum nl80211_iftype internal_type = type; 1510 bool p2p = false; 1511 1512 ASSERT_RTNL(); 1513 1514 if (!local->ops->change_interface) 1515 return -EBUSY; 1516 1517 switch (sdata->vif.type) { 1518 case NL80211_IFTYPE_AP: 1519 case NL80211_IFTYPE_STATION: 1520 case NL80211_IFTYPE_ADHOC: 1521 case NL80211_IFTYPE_OCB: 1522 /* 1523 * Could maybe also all others here? 1524 * Just not sure how that interacts 1525 * with the RX/config path e.g. for 1526 * mesh. 1527 */ 1528 break; 1529 default: 1530 return -EBUSY; 1531 } 1532 1533 switch (type) { 1534 case NL80211_IFTYPE_AP: 1535 case NL80211_IFTYPE_STATION: 1536 case NL80211_IFTYPE_ADHOC: 1537 case NL80211_IFTYPE_OCB: 1538 /* 1539 * Could probably support everything 1540 * but WDS here (WDS do_open can fail 1541 * under memory pressure, which this 1542 * code isn't prepared to handle). 1543 */ 1544 break; 1545 case NL80211_IFTYPE_P2P_CLIENT: 1546 p2p = true; 1547 internal_type = NL80211_IFTYPE_STATION; 1548 break; 1549 case NL80211_IFTYPE_P2P_GO: 1550 p2p = true; 1551 internal_type = NL80211_IFTYPE_AP; 1552 break; 1553 default: 1554 return -EBUSY; 1555 } 1556 1557 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1558 if (ret) 1559 return ret; 1560 1561 ieee80211_do_stop(sdata, false); 1562 1563 ieee80211_teardown_sdata(sdata); 1564 1565 ret = drv_change_interface(local, sdata, internal_type, p2p); 1566 if (ret) 1567 type = ieee80211_vif_type_p2p(&sdata->vif); 1568 1569 /* 1570 * Ignore return value here, there's not much we can do since 1571 * the driver changed the interface type internally already. 1572 * The warnings will hopefully make driver authors fix it :-) 1573 */ 1574 ieee80211_check_queues(sdata, type); 1575 1576 ieee80211_setup_sdata(sdata, type); 1577 1578 err = ieee80211_do_open(&sdata->wdev, false); 1579 WARN(err, "type change: do_open returned %d", err); 1580 1581 return ret; 1582 } 1583 1584 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1585 enum nl80211_iftype type) 1586 { 1587 int ret; 1588 1589 ASSERT_RTNL(); 1590 1591 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1592 return 0; 1593 1594 if (ieee80211_sdata_running(sdata)) { 1595 ret = ieee80211_runtime_change_iftype(sdata, type); 1596 if (ret) 1597 return ret; 1598 } else { 1599 /* Purge and reset type-dependent state. */ 1600 ieee80211_teardown_sdata(sdata); 1601 ieee80211_setup_sdata(sdata, type); 1602 } 1603 1604 /* reset some values that shouldn't be kept across type changes */ 1605 if (type == NL80211_IFTYPE_STATION) 1606 sdata->u.mgd.use_4addr = false; 1607 1608 return 0; 1609 } 1610 1611 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1612 u8 *perm_addr, enum nl80211_iftype type) 1613 { 1614 struct ieee80211_sub_if_data *sdata; 1615 u64 mask, start, addr, val, inc; 1616 u8 *m; 1617 u8 tmp_addr[ETH_ALEN]; 1618 int i; 1619 1620 /* default ... something at least */ 1621 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1622 1623 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1624 local->hw.wiphy->n_addresses <= 1) 1625 return; 1626 1627 mutex_lock(&local->iflist_mtx); 1628 1629 switch (type) { 1630 case NL80211_IFTYPE_MONITOR: 1631 /* doesn't matter */ 1632 break; 1633 case NL80211_IFTYPE_WDS: 1634 case NL80211_IFTYPE_AP_VLAN: 1635 /* match up with an AP interface */ 1636 list_for_each_entry(sdata, &local->interfaces, list) { 1637 if (sdata->vif.type != NL80211_IFTYPE_AP) 1638 continue; 1639 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1640 break; 1641 } 1642 /* keep default if no AP interface present */ 1643 break; 1644 case NL80211_IFTYPE_P2P_CLIENT: 1645 case NL80211_IFTYPE_P2P_GO: 1646 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) { 1647 list_for_each_entry(sdata, &local->interfaces, list) { 1648 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1649 continue; 1650 if (!ieee80211_sdata_running(sdata)) 1651 continue; 1652 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1653 goto out_unlock; 1654 } 1655 } 1656 /* otherwise fall through */ 1657 default: 1658 /* assign a new address if possible -- try n_addresses first */ 1659 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1660 bool used = false; 1661 1662 list_for_each_entry(sdata, &local->interfaces, list) { 1663 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1664 sdata->vif.addr)) { 1665 used = true; 1666 break; 1667 } 1668 } 1669 1670 if (!used) { 1671 memcpy(perm_addr, 1672 local->hw.wiphy->addresses[i].addr, 1673 ETH_ALEN); 1674 break; 1675 } 1676 } 1677 1678 /* try mask if available */ 1679 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1680 break; 1681 1682 m = local->hw.wiphy->addr_mask; 1683 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1684 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1685 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1686 1687 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1688 /* not a contiguous mask ... not handled now! */ 1689 pr_info("not contiguous\n"); 1690 break; 1691 } 1692 1693 /* 1694 * Pick address of existing interface in case user changed 1695 * MAC address manually, default to perm_addr. 1696 */ 1697 m = local->hw.wiphy->perm_addr; 1698 list_for_each_entry(sdata, &local->interfaces, list) { 1699 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1700 continue; 1701 m = sdata->vif.addr; 1702 break; 1703 } 1704 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1705 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1706 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1707 1708 inc = 1ULL<<__ffs64(mask); 1709 val = (start & mask); 1710 addr = (start & ~mask) | (val & mask); 1711 do { 1712 bool used = false; 1713 1714 tmp_addr[5] = addr >> 0*8; 1715 tmp_addr[4] = addr >> 1*8; 1716 tmp_addr[3] = addr >> 2*8; 1717 tmp_addr[2] = addr >> 3*8; 1718 tmp_addr[1] = addr >> 4*8; 1719 tmp_addr[0] = addr >> 5*8; 1720 1721 val += inc; 1722 1723 list_for_each_entry(sdata, &local->interfaces, list) { 1724 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1725 used = true; 1726 break; 1727 } 1728 } 1729 1730 if (!used) { 1731 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1732 break; 1733 } 1734 addr = (start & ~mask) | (val & mask); 1735 } while (addr != start); 1736 1737 break; 1738 } 1739 1740 out_unlock: 1741 mutex_unlock(&local->iflist_mtx); 1742 } 1743 1744 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1745 unsigned char name_assign_type, 1746 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1747 struct vif_params *params) 1748 { 1749 struct net_device *ndev = NULL; 1750 struct ieee80211_sub_if_data *sdata = NULL; 1751 struct txq_info *txqi; 1752 void (*if_setup)(struct net_device *dev); 1753 int ret, i; 1754 int txqs = 1; 1755 1756 ASSERT_RTNL(); 1757 1758 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) { 1759 struct wireless_dev *wdev; 1760 1761 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1762 GFP_KERNEL); 1763 if (!sdata) 1764 return -ENOMEM; 1765 wdev = &sdata->wdev; 1766 1767 sdata->dev = NULL; 1768 strlcpy(sdata->name, name, IFNAMSIZ); 1769 ieee80211_assign_perm_addr(local, wdev->address, type); 1770 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1771 } else { 1772 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 1773 sizeof(void *)); 1774 int txq_size = 0; 1775 1776 if (local->ops->wake_tx_queue) 1777 txq_size += sizeof(struct txq_info) + 1778 local->hw.txq_data_size; 1779 1780 if (local->ops->wake_tx_queue) 1781 if_setup = ieee80211_if_setup_no_queue; 1782 else 1783 if_setup = ieee80211_if_setup; 1784 1785 if (local->hw.queues >= IEEE80211_NUM_ACS) 1786 txqs = IEEE80211_NUM_ACS; 1787 1788 ndev = alloc_netdev_mqs(size + txq_size, 1789 name, name_assign_type, 1790 if_setup, txqs, 1); 1791 if (!ndev) 1792 return -ENOMEM; 1793 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1794 1795 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1796 if (!ndev->tstats) { 1797 free_netdev(ndev); 1798 return -ENOMEM; 1799 } 1800 1801 ndev->needed_headroom = local->tx_headroom + 1802 4*6 /* four MAC addresses */ 1803 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1804 + 6 /* mesh */ 1805 + 8 /* rfc1042/bridge tunnel */ 1806 - ETH_HLEN /* ethernet hard_header_len */ 1807 + IEEE80211_ENCRYPT_HEADROOM; 1808 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1809 1810 ret = dev_alloc_name(ndev, ndev->name); 1811 if (ret < 0) { 1812 ieee80211_if_free(ndev); 1813 return ret; 1814 } 1815 1816 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1817 if (params && is_valid_ether_addr(params->macaddr)) 1818 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN); 1819 else 1820 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1821 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1822 1823 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1824 sdata = netdev_priv(ndev); 1825 ndev->ieee80211_ptr = &sdata->wdev; 1826 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1827 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1828 1829 if (txq_size) { 1830 txqi = netdev_priv(ndev) + size; 1831 ieee80211_txq_init(sdata, NULL, txqi, 0); 1832 } 1833 1834 sdata->dev = ndev; 1835 } 1836 1837 /* initialise type-independent data */ 1838 sdata->wdev.wiphy = local->hw.wiphy; 1839 sdata->local = local; 1840 1841 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1842 skb_queue_head_init(&sdata->fragments[i].skb_list); 1843 1844 INIT_LIST_HEAD(&sdata->key_list); 1845 1846 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1847 ieee80211_dfs_cac_timer_work); 1848 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1849 ieee80211_delayed_tailroom_dec); 1850 1851 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1852 struct ieee80211_supported_band *sband; 1853 sband = local->hw.wiphy->bands[i]; 1854 sdata->rc_rateidx_mask[i] = 1855 sband ? (1 << sband->n_bitrates) - 1 : 0; 1856 if (sband) { 1857 __le16 cap; 1858 u16 *vht_rate_mask; 1859 1860 memcpy(sdata->rc_rateidx_mcs_mask[i], 1861 sband->ht_cap.mcs.rx_mask, 1862 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1863 1864 cap = sband->vht_cap.vht_mcs.rx_mcs_map; 1865 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i]; 1866 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask); 1867 } else { 1868 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1869 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1870 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0, 1871 sizeof(sdata->rc_rateidx_vht_mcs_mask[i])); 1872 } 1873 } 1874 1875 ieee80211_set_default_queues(sdata); 1876 1877 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1878 sdata->user_power_level = local->user_power_level; 1879 1880 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1881 1882 /* setup type-dependent data */ 1883 ieee80211_setup_sdata(sdata, type); 1884 1885 if (ndev) { 1886 if (params) { 1887 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1888 if (type == NL80211_IFTYPE_STATION) 1889 sdata->u.mgd.use_4addr = params->use_4addr; 1890 } 1891 1892 ndev->features |= local->hw.netdev_features; 1893 1894 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 1895 1896 /* MTU range: 256 - 2304 */ 1897 ndev->min_mtu = 256; 1898 ndev->max_mtu = IEEE80211_MAX_DATA_LEN; 1899 1900 ret = register_netdevice(ndev); 1901 if (ret) { 1902 ieee80211_if_free(ndev); 1903 return ret; 1904 } 1905 } 1906 1907 mutex_lock(&local->iflist_mtx); 1908 list_add_tail_rcu(&sdata->list, &local->interfaces); 1909 mutex_unlock(&local->iflist_mtx); 1910 1911 if (new_wdev) 1912 *new_wdev = &sdata->wdev; 1913 1914 return 0; 1915 } 1916 1917 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1918 { 1919 ASSERT_RTNL(); 1920 1921 mutex_lock(&sdata->local->iflist_mtx); 1922 list_del_rcu(&sdata->list); 1923 mutex_unlock(&sdata->local->iflist_mtx); 1924 1925 synchronize_rcu(); 1926 1927 if (sdata->dev) { 1928 unregister_netdevice(sdata->dev); 1929 } else { 1930 cfg80211_unregister_wdev(&sdata->wdev); 1931 ieee80211_teardown_sdata(sdata); 1932 kfree(sdata); 1933 } 1934 } 1935 1936 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1937 { 1938 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1939 return; 1940 ieee80211_do_stop(sdata, true); 1941 } 1942 1943 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1944 { 1945 struct ieee80211_sub_if_data *sdata, *tmp; 1946 LIST_HEAD(unreg_list); 1947 LIST_HEAD(wdev_list); 1948 1949 ASSERT_RTNL(); 1950 1951 /* Before destroying the interfaces, make sure they're all stopped so 1952 * that the hardware is stopped. Otherwise, the driver might still be 1953 * iterating the interfaces during the shutdown, e.g. from a worker 1954 * or from RX processing or similar, and if it does so (using atomic 1955 * iteration) while we're manipulating the list, the iteration will 1956 * crash. 1957 * 1958 * After this, the hardware should be stopped and the driver should 1959 * have stopped all of its activities, so that we can do RCU-unaware 1960 * manipulations of the interface list below. 1961 */ 1962 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 1963 1964 WARN(local->open_count, "%s: open count remains %d\n", 1965 wiphy_name(local->hw.wiphy), local->open_count); 1966 1967 mutex_lock(&local->iflist_mtx); 1968 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1969 list_del(&sdata->list); 1970 1971 if (sdata->dev) 1972 unregister_netdevice_queue(sdata->dev, &unreg_list); 1973 else 1974 list_add(&sdata->list, &wdev_list); 1975 } 1976 mutex_unlock(&local->iflist_mtx); 1977 unregister_netdevice_many(&unreg_list); 1978 1979 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1980 list_del(&sdata->list); 1981 cfg80211_unregister_wdev(&sdata->wdev); 1982 kfree(sdata); 1983 } 1984 } 1985 1986 static int netdev_notify(struct notifier_block *nb, 1987 unsigned long state, void *ptr) 1988 { 1989 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1990 struct ieee80211_sub_if_data *sdata; 1991 1992 if (state != NETDEV_CHANGENAME) 1993 return NOTIFY_DONE; 1994 1995 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1996 return NOTIFY_DONE; 1997 1998 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1999 return NOTIFY_DONE; 2000 2001 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2002 memcpy(sdata->name, dev->name, IFNAMSIZ); 2003 ieee80211_debugfs_rename_netdev(sdata); 2004 2005 return NOTIFY_OK; 2006 } 2007 2008 static struct notifier_block mac80211_netdev_notifier = { 2009 .notifier_call = netdev_notify, 2010 }; 2011 2012 int ieee80211_iface_init(void) 2013 { 2014 return register_netdevice_notifier(&mac80211_netdev_notifier); 2015 } 2016 2017 void ieee80211_iface_exit(void) 2018 { 2019 unregister_netdevice_notifier(&mac80211_netdev_notifier); 2020 } 2021 2022 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata) 2023 { 2024 if (sdata->vif.type == NL80211_IFTYPE_AP) 2025 atomic_inc(&sdata->u.ap.num_mcast_sta); 2026 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2027 atomic_inc(&sdata->u.vlan.num_mcast_sta); 2028 } 2029 2030 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata) 2031 { 2032 if (sdata->vif.type == NL80211_IFTYPE_AP) 2033 atomic_dec(&sdata->u.ap.num_mcast_sta); 2034 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2035 atomic_dec(&sdata->u.vlan.num_mcast_sta); 2036 } 2037