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 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/if_arp.h> 16 #include <linux/netdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <net/mac80211.h> 19 #include <net/ieee80211_radiotap.h> 20 #include "ieee80211_i.h" 21 #include "sta_info.h" 22 #include "debugfs_netdev.h" 23 #include "mesh.h" 24 #include "led.h" 25 #include "driver-ops.h" 26 #include "wme.h" 27 #include "rate.h" 28 29 /** 30 * DOC: Interface list locking 31 * 32 * The interface list in each struct ieee80211_local is protected 33 * three-fold: 34 * 35 * (1) modifications may only be done under the RTNL 36 * (2) modifications and readers are protected against each other by 37 * the iflist_mtx. 38 * (3) modifications are done in an RCU manner so atomic readers 39 * can traverse the list in RCU-safe blocks. 40 * 41 * As a consequence, reads (traversals) of the list can be protected 42 * by either the RTNL, the iflist_mtx or RCU. 43 */ 44 45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 46 { 47 struct ieee80211_chanctx_conf *chanctx_conf; 48 int power; 49 50 rcu_read_lock(); 51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 52 if (!chanctx_conf) { 53 rcu_read_unlock(); 54 return false; 55 } 56 57 power = ieee80211_chandef_max_power(&chanctx_conf->def); 58 rcu_read_unlock(); 59 60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 61 power = min(power, sdata->user_power_level); 62 63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 64 power = min(power, sdata->ap_power_level); 65 66 if (power != sdata->vif.bss_conf.txpower) { 67 sdata->vif.bss_conf.txpower = power; 68 ieee80211_hw_config(sdata->local, 0); 69 return true; 70 } 71 72 return false; 73 } 74 75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 76 { 77 if (__ieee80211_recalc_txpower(sdata)) 78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 79 } 80 81 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 82 { 83 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 84 return 0; 85 86 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 87 return IEEE80211_CONF_CHANGE_IDLE; 88 } 89 90 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 91 { 92 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 93 return 0; 94 95 ieee80211_flush_queues(local, NULL); 96 97 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 98 return IEEE80211_CONF_CHANGE_IDLE; 99 } 100 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 102 bool force_active) 103 { 104 bool working = false, scanning, active; 105 unsigned int led_trig_start = 0, led_trig_stop = 0; 106 struct ieee80211_roc_work *roc; 107 108 lockdep_assert_held(&local->mtx); 109 110 active = force_active || 111 !list_empty(&local->chanctx_list) || 112 local->monitors; 113 114 if (!local->ops->remain_on_channel) { 115 list_for_each_entry(roc, &local->roc_list, list) { 116 working = true; 117 break; 118 } 119 } 120 121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 123 124 if (working || scanning) 125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 else 127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 128 129 if (active) 130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 else 132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 133 134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 135 136 if (working || scanning || active) 137 return __ieee80211_idle_off(local); 138 return __ieee80211_idle_on(local); 139 } 140 141 u32 ieee80211_idle_off(struct ieee80211_local *local) 142 { 143 return __ieee80211_recalc_idle(local, true); 144 } 145 146 void ieee80211_recalc_idle(struct ieee80211_local *local) 147 { 148 u32 change = __ieee80211_recalc_idle(local, false); 149 if (change) 150 ieee80211_hw_config(local, change); 151 } 152 153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 154 { 155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) 156 return -EINVAL; 157 158 dev->mtu = new_mtu; 159 return 0; 160 } 161 162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 163 bool check_dup) 164 { 165 struct ieee80211_local *local = sdata->local; 166 struct ieee80211_sub_if_data *iter; 167 u64 new, mask, tmp; 168 u8 *m; 169 int ret = 0; 170 171 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 172 return 0; 173 174 m = addr; 175 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 178 179 m = local->hw.wiphy->addr_mask; 180 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 181 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 182 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 183 184 if (!check_dup) 185 return ret; 186 187 mutex_lock(&local->iflist_mtx); 188 list_for_each_entry(iter, &local->interfaces, list) { 189 if (iter == sdata) 190 continue; 191 192 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 193 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 194 continue; 195 196 m = iter->vif.addr; 197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 200 201 if ((new & ~mask) != (tmp & ~mask)) { 202 ret = -EINVAL; 203 break; 204 } 205 } 206 mutex_unlock(&local->iflist_mtx); 207 208 return ret; 209 } 210 211 static int ieee80211_change_mac(struct net_device *dev, void *addr) 212 { 213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 214 struct sockaddr *sa = addr; 215 bool check_dup = true; 216 int ret; 217 218 if (ieee80211_sdata_running(sdata)) 219 return -EBUSY; 220 221 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 222 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 223 check_dup = false; 224 225 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 226 if (ret) 227 return ret; 228 229 ret = eth_mac_addr(dev, sa); 230 231 if (ret == 0) 232 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 233 234 return ret; 235 } 236 237 static inline int identical_mac_addr_allowed(int type1, int type2) 238 { 239 return type1 == NL80211_IFTYPE_MONITOR || 240 type2 == NL80211_IFTYPE_MONITOR || 241 type1 == NL80211_IFTYPE_P2P_DEVICE || 242 type2 == NL80211_IFTYPE_P2P_DEVICE || 243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 244 (type1 == NL80211_IFTYPE_WDS && 245 (type2 == NL80211_IFTYPE_WDS || 246 type2 == NL80211_IFTYPE_AP)) || 247 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 248 (type1 == NL80211_IFTYPE_AP_VLAN && 249 (type2 == NL80211_IFTYPE_AP || 250 type2 == NL80211_IFTYPE_AP_VLAN)); 251 } 252 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 254 enum nl80211_iftype iftype) 255 { 256 struct ieee80211_local *local = sdata->local; 257 struct ieee80211_sub_if_data *nsdata; 258 259 ASSERT_RTNL(); 260 261 /* we hold the RTNL here so can safely walk the list */ 262 list_for_each_entry(nsdata, &local->interfaces, list) { 263 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 264 /* 265 * Allow only a single IBSS interface to be up at any 266 * time. This is restricted because beacon distribution 267 * cannot work properly if both are in the same IBSS. 268 * 269 * To remove this restriction we'd have to disallow them 270 * from setting the same SSID on different IBSS interfaces 271 * belonging to the same hardware. Then, however, we're 272 * faced with having to adopt two different TSF timers... 273 */ 274 if (iftype == NL80211_IFTYPE_ADHOC && 275 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 276 return -EBUSY; 277 /* 278 * will not add another interface while any channel 279 * switch is active. 280 */ 281 if (nsdata->vif.csa_active) 282 return -EBUSY; 283 284 /* 285 * The remaining checks are only performed for interfaces 286 * with the same MAC address. 287 */ 288 if (!ether_addr_equal(sdata->vif.addr, 289 nsdata->vif.addr)) 290 continue; 291 292 /* 293 * check whether it may have the same address 294 */ 295 if (!identical_mac_addr_allowed(iftype, 296 nsdata->vif.type)) 297 return -ENOTUNIQ; 298 299 /* 300 * can only add VLANs to enabled APs 301 */ 302 if (iftype == NL80211_IFTYPE_AP_VLAN && 303 nsdata->vif.type == NL80211_IFTYPE_AP) 304 sdata->bss = &nsdata->u.ap; 305 } 306 } 307 308 return 0; 309 } 310 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 312 enum nl80211_iftype iftype) 313 { 314 int n_queues = sdata->local->hw.queues; 315 int i; 316 317 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 318 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 319 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 320 IEEE80211_INVAL_HW_QUEUE)) 321 return -EINVAL; 322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 323 n_queues)) 324 return -EINVAL; 325 } 326 } 327 328 if ((iftype != NL80211_IFTYPE_AP && 329 iftype != NL80211_IFTYPE_P2P_GO && 330 iftype != NL80211_IFTYPE_MESH_POINT) || 331 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { 332 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 333 return 0; 334 } 335 336 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 337 return -EINVAL; 338 339 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 340 return -EINVAL; 341 342 return 0; 343 } 344 345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 346 const int offset) 347 { 348 struct ieee80211_local *local = sdata->local; 349 u32 flags = sdata->u.mntr_flags; 350 351 #define ADJUST(_f, _s) do { \ 352 if (flags & MONITOR_FLAG_##_f) \ 353 local->fif_##_s += offset; \ 354 } while (0) 355 356 ADJUST(FCSFAIL, fcsfail); 357 ADJUST(PLCPFAIL, plcpfail); 358 ADJUST(CONTROL, control); 359 ADJUST(CONTROL, pspoll); 360 ADJUST(OTHER_BSS, other_bss); 361 362 #undef ADJUST 363 } 364 365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 366 { 367 struct ieee80211_local *local = sdata->local; 368 int i; 369 370 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 371 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 372 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 373 else if (local->hw.queues >= IEEE80211_NUM_ACS) 374 sdata->vif.hw_queue[i] = i; 375 else 376 sdata->vif.hw_queue[i] = 0; 377 } 378 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 379 } 380 381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 382 { 383 struct ieee80211_sub_if_data *sdata; 384 int ret; 385 386 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 387 return 0; 388 389 ASSERT_RTNL(); 390 391 if (local->monitor_sdata) 392 return 0; 393 394 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 395 if (!sdata) 396 return -ENOMEM; 397 398 /* set up data */ 399 sdata->local = local; 400 sdata->vif.type = NL80211_IFTYPE_MONITOR; 401 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 402 wiphy_name(local->hw.wiphy)); 403 404 ieee80211_set_default_queues(sdata); 405 406 ret = drv_add_interface(local, sdata); 407 if (WARN_ON(ret)) { 408 /* ok .. stupid driver, it asked for this! */ 409 kfree(sdata); 410 return ret; 411 } 412 413 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 414 if (ret) { 415 kfree(sdata); 416 return ret; 417 } 418 419 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 420 IEEE80211_CHANCTX_EXCLUSIVE); 421 if (ret) { 422 drv_remove_interface(local, sdata); 423 kfree(sdata); 424 return ret; 425 } 426 427 mutex_lock(&local->iflist_mtx); 428 rcu_assign_pointer(local->monitor_sdata, sdata); 429 mutex_unlock(&local->iflist_mtx); 430 431 return 0; 432 } 433 434 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 435 { 436 struct ieee80211_sub_if_data *sdata; 437 438 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 439 return; 440 441 ASSERT_RTNL(); 442 443 mutex_lock(&local->iflist_mtx); 444 445 sdata = rcu_dereference_protected(local->monitor_sdata, 446 lockdep_is_held(&local->iflist_mtx)); 447 if (!sdata) { 448 mutex_unlock(&local->iflist_mtx); 449 return; 450 } 451 452 rcu_assign_pointer(local->monitor_sdata, NULL); 453 mutex_unlock(&local->iflist_mtx); 454 455 synchronize_net(); 456 457 ieee80211_vif_release_channel(sdata); 458 459 drv_remove_interface(local, sdata); 460 461 kfree(sdata); 462 } 463 464 /* 465 * NOTE: Be very careful when changing this function, it must NOT return 466 * an error on interface type changes that have been pre-checked, so most 467 * checks should be in ieee80211_check_concurrent_iface. 468 */ 469 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 470 { 471 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 472 struct net_device *dev = wdev->netdev; 473 struct ieee80211_local *local = sdata->local; 474 struct sta_info *sta; 475 u32 changed = 0; 476 int res; 477 u32 hw_reconf_flags = 0; 478 479 switch (sdata->vif.type) { 480 case NL80211_IFTYPE_WDS: 481 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 482 return -ENOLINK; 483 break; 484 case NL80211_IFTYPE_AP_VLAN: { 485 struct ieee80211_sub_if_data *master; 486 487 if (!sdata->bss) 488 return -ENOLINK; 489 490 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 491 492 master = container_of(sdata->bss, 493 struct ieee80211_sub_if_data, u.ap); 494 sdata->control_port_protocol = 495 master->control_port_protocol; 496 sdata->control_port_no_encrypt = 497 master->control_port_no_encrypt; 498 sdata->vif.cab_queue = master->vif.cab_queue; 499 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 500 sizeof(sdata->vif.hw_queue)); 501 break; 502 } 503 case NL80211_IFTYPE_AP: 504 sdata->bss = &sdata->u.ap; 505 break; 506 case NL80211_IFTYPE_MESH_POINT: 507 case NL80211_IFTYPE_STATION: 508 case NL80211_IFTYPE_MONITOR: 509 case NL80211_IFTYPE_ADHOC: 510 case NL80211_IFTYPE_P2P_DEVICE: 511 /* no special treatment */ 512 break; 513 case NL80211_IFTYPE_UNSPECIFIED: 514 case NUM_NL80211_IFTYPES: 515 case NL80211_IFTYPE_P2P_CLIENT: 516 case NL80211_IFTYPE_P2P_GO: 517 /* cannot happen */ 518 WARN_ON(1); 519 break; 520 } 521 522 if (local->open_count == 0) { 523 res = drv_start(local); 524 if (res) 525 goto err_del_bss; 526 /* we're brought up, everything changes */ 527 hw_reconf_flags = ~0; 528 ieee80211_led_radio(local, true); 529 ieee80211_mod_tpt_led_trig(local, 530 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 531 } 532 533 /* 534 * Copy the hopefully now-present MAC address to 535 * this interface, if it has the special null one. 536 */ 537 if (dev && is_zero_ether_addr(dev->dev_addr)) { 538 memcpy(dev->dev_addr, 539 local->hw.wiphy->perm_addr, 540 ETH_ALEN); 541 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 542 543 if (!is_valid_ether_addr(dev->dev_addr)) { 544 res = -EADDRNOTAVAIL; 545 goto err_stop; 546 } 547 } 548 549 switch (sdata->vif.type) { 550 case NL80211_IFTYPE_AP_VLAN: 551 /* no need to tell driver, but set carrier and chanctx */ 552 if (rtnl_dereference(sdata->bss->beacon)) { 553 ieee80211_vif_vlan_copy_chanctx(sdata); 554 netif_carrier_on(dev); 555 } else { 556 netif_carrier_off(dev); 557 } 558 break; 559 case NL80211_IFTYPE_MONITOR: 560 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 561 local->cooked_mntrs++; 562 break; 563 } 564 565 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 566 res = drv_add_interface(local, sdata); 567 if (res) 568 goto err_stop; 569 } else if (local->monitors == 0 && local->open_count == 0) { 570 res = ieee80211_add_virtual_monitor(local); 571 if (res) 572 goto err_stop; 573 } 574 575 /* must be before the call to ieee80211_configure_filter */ 576 local->monitors++; 577 if (local->monitors == 1) { 578 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 579 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 580 } 581 582 ieee80211_adjust_monitor_flags(sdata, 1); 583 ieee80211_configure_filter(local); 584 mutex_lock(&local->mtx); 585 ieee80211_recalc_idle(local); 586 mutex_unlock(&local->mtx); 587 588 netif_carrier_on(dev); 589 break; 590 default: 591 if (coming_up) { 592 ieee80211_del_virtual_monitor(local); 593 594 res = drv_add_interface(local, sdata); 595 if (res) 596 goto err_stop; 597 res = ieee80211_check_queues(sdata, 598 ieee80211_vif_type_p2p(&sdata->vif)); 599 if (res) 600 goto err_del_interface; 601 } 602 603 if (sdata->vif.type == NL80211_IFTYPE_AP) { 604 local->fif_pspoll++; 605 local->fif_probe_req++; 606 607 ieee80211_configure_filter(local); 608 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 609 local->fif_probe_req++; 610 } 611 612 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 613 changed |= ieee80211_reset_erp_info(sdata); 614 ieee80211_bss_info_change_notify(sdata, changed); 615 616 switch (sdata->vif.type) { 617 case NL80211_IFTYPE_STATION: 618 case NL80211_IFTYPE_ADHOC: 619 case NL80211_IFTYPE_AP: 620 case NL80211_IFTYPE_MESH_POINT: 621 netif_carrier_off(dev); 622 break; 623 case NL80211_IFTYPE_WDS: 624 case NL80211_IFTYPE_P2P_DEVICE: 625 break; 626 default: 627 /* not reached */ 628 WARN_ON(1); 629 } 630 631 /* 632 * set default queue parameters so drivers don't 633 * need to initialise the hardware if the hardware 634 * doesn't start up with sane defaults 635 */ 636 ieee80211_set_wmm_default(sdata, true); 637 } 638 639 set_bit(SDATA_STATE_RUNNING, &sdata->state); 640 641 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 642 /* Create STA entry for the WDS peer */ 643 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 644 GFP_KERNEL); 645 if (!sta) { 646 res = -ENOMEM; 647 goto err_del_interface; 648 } 649 650 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 651 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 652 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 653 654 res = sta_info_insert(sta); 655 if (res) { 656 /* STA has been freed */ 657 goto err_del_interface; 658 } 659 660 rate_control_rate_init(sta); 661 netif_carrier_on(dev); 662 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 663 rcu_assign_pointer(local->p2p_sdata, sdata); 664 } 665 666 /* 667 * set_multicast_list will be invoked by the networking core 668 * which will check whether any increments here were done in 669 * error and sync them down to the hardware as filter flags. 670 */ 671 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 672 atomic_inc(&local->iff_allmultis); 673 674 if (sdata->flags & IEEE80211_SDATA_PROMISC) 675 atomic_inc(&local->iff_promiscs); 676 677 if (coming_up) 678 local->open_count++; 679 680 if (hw_reconf_flags) 681 ieee80211_hw_config(local, hw_reconf_flags); 682 683 ieee80211_recalc_ps(local, -1); 684 685 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 687 /* XXX: for AP_VLAN, actually track AP queues */ 688 netif_tx_start_all_queues(dev); 689 } else if (dev) { 690 unsigned long flags; 691 int n_acs = IEEE80211_NUM_ACS; 692 int ac; 693 694 if (local->hw.queues < IEEE80211_NUM_ACS) 695 n_acs = 1; 696 697 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 698 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 699 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 700 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 701 for (ac = 0; ac < n_acs; ac++) { 702 int ac_queue = sdata->vif.hw_queue[ac]; 703 704 if (local->queue_stop_reasons[ac_queue] == 0 && 705 skb_queue_empty(&local->pending[ac_queue])) 706 netif_start_subqueue(dev, ac); 707 } 708 } 709 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 710 } 711 712 return 0; 713 err_del_interface: 714 drv_remove_interface(local, sdata); 715 err_stop: 716 if (!local->open_count) 717 drv_stop(local); 718 err_del_bss: 719 sdata->bss = NULL; 720 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 721 list_del(&sdata->u.vlan.list); 722 /* might already be clear but that doesn't matter */ 723 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 724 return res; 725 } 726 727 static int ieee80211_open(struct net_device *dev) 728 { 729 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 730 int err; 731 732 /* fail early if user set an invalid address */ 733 if (!is_valid_ether_addr(dev->dev_addr)) 734 return -EADDRNOTAVAIL; 735 736 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 737 if (err) 738 return err; 739 740 return ieee80211_do_open(&sdata->wdev, true); 741 } 742 743 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 744 bool going_down) 745 { 746 struct ieee80211_local *local = sdata->local; 747 unsigned long flags; 748 struct sk_buff *skb, *tmp; 749 u32 hw_reconf_flags = 0; 750 int i, flushed; 751 struct ps_data *ps; 752 753 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 754 755 if (rcu_access_pointer(local->scan_sdata) == sdata) 756 ieee80211_scan_cancel(local); 757 758 /* 759 * Stop TX on this interface first. 760 */ 761 if (sdata->dev) 762 netif_tx_stop_all_queues(sdata->dev); 763 764 ieee80211_roc_purge(local, sdata); 765 766 if (sdata->vif.type == NL80211_IFTYPE_STATION) 767 ieee80211_mgd_stop(sdata); 768 769 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 770 ieee80211_ibss_stop(sdata); 771 772 773 /* 774 * Remove all stations associated with this interface. 775 * 776 * This must be done before calling ops->remove_interface() 777 * because otherwise we can later invoke ops->sta_notify() 778 * whenever the STAs are removed, and that invalidates driver 779 * assumptions about always getting a vif pointer that is valid 780 * (because if we remove a STA after ops->remove_interface() 781 * the driver will have removed the vif info already!) 782 * 783 * This is relevant only in WDS mode, in all other modes we've 784 * already removed all stations when disconnecting or similar, 785 * so warn otherwise. 786 * 787 * We call sta_info_flush_cleanup() later, to combine RCU waits. 788 */ 789 flushed = sta_info_flush_defer(sdata); 790 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 791 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)); 792 793 /* don't count this interface for promisc/allmulti while it is down */ 794 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 795 atomic_dec(&local->iff_allmultis); 796 797 if (sdata->flags & IEEE80211_SDATA_PROMISC) 798 atomic_dec(&local->iff_promiscs); 799 800 if (sdata->vif.type == NL80211_IFTYPE_AP) { 801 local->fif_pspoll--; 802 local->fif_probe_req--; 803 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 804 local->fif_probe_req--; 805 } 806 807 if (sdata->dev) { 808 netif_addr_lock_bh(sdata->dev); 809 spin_lock_bh(&local->filter_lock); 810 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 811 sdata->dev->addr_len); 812 spin_unlock_bh(&local->filter_lock); 813 netif_addr_unlock_bh(sdata->dev); 814 } 815 816 del_timer_sync(&local->dynamic_ps_timer); 817 cancel_work_sync(&local->dynamic_ps_enable_work); 818 819 cancel_work_sync(&sdata->recalc_smps); 820 sdata->vif.csa_active = false; 821 cancel_work_sync(&sdata->csa_finalize_work); 822 823 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 824 825 if (sdata->wdev.cac_started) { 826 WARN_ON(local->suspended); 827 mutex_lock(&local->iflist_mtx); 828 ieee80211_vif_release_channel(sdata); 829 mutex_unlock(&local->iflist_mtx); 830 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED, 831 GFP_KERNEL); 832 } 833 834 /* APs need special treatment */ 835 if (sdata->vif.type == NL80211_IFTYPE_AP) { 836 struct ieee80211_sub_if_data *vlan, *tmpsdata; 837 838 /* down all dependent devices, that is VLANs */ 839 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 840 u.vlan.list) 841 dev_close(vlan->dev); 842 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 843 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 844 /* remove all packets in parent bc_buf pointing to this dev */ 845 ps = &sdata->bss->ps; 846 847 spin_lock_irqsave(&ps->bc_buf.lock, flags); 848 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 849 if (skb->dev == sdata->dev) { 850 __skb_unlink(skb, &ps->bc_buf); 851 local->total_ps_buffered--; 852 ieee80211_free_txskb(&local->hw, skb); 853 } 854 } 855 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 856 } 857 858 if (going_down) 859 local->open_count--; 860 861 switch (sdata->vif.type) { 862 case NL80211_IFTYPE_AP_VLAN: 863 list_del(&sdata->u.vlan.list); 864 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); 865 /* no need to tell driver */ 866 break; 867 case NL80211_IFTYPE_MONITOR: 868 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 869 local->cooked_mntrs--; 870 break; 871 } 872 873 local->monitors--; 874 if (local->monitors == 0) { 875 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 876 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 877 } 878 879 ieee80211_adjust_monitor_flags(sdata, -1); 880 break; 881 case NL80211_IFTYPE_P2P_DEVICE: 882 /* relies on synchronize_rcu() below */ 883 rcu_assign_pointer(local->p2p_sdata, NULL); 884 /* fall through */ 885 default: 886 cancel_work_sync(&sdata->work); 887 /* 888 * When we get here, the interface is marked down. 889 * 890 * sta_info_flush_cleanup() requires rcu_barrier() 891 * first to wait for the station call_rcu() calls 892 * to complete, and we also need synchronize_rcu() 893 * to wait for the RX path in case it is using the 894 * interface and enqueuing frames at this very time on 895 * another CPU. 896 */ 897 synchronize_rcu(); 898 rcu_barrier(); 899 sta_info_flush_cleanup(sdata); 900 901 /* 902 * Free all remaining keys, there shouldn't be any, 903 * except maybe in WDS mode? 904 */ 905 ieee80211_free_keys(sdata); 906 907 /* fall through */ 908 case NL80211_IFTYPE_AP: 909 skb_queue_purge(&sdata->skb_queue); 910 } 911 912 sdata->bss = NULL; 913 914 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 915 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 916 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 917 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 918 if (info->control.vif == &sdata->vif) { 919 __skb_unlink(skb, &local->pending[i]); 920 ieee80211_free_txskb(&local->hw, skb); 921 } 922 } 923 } 924 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 925 926 if (local->open_count == 0) 927 ieee80211_clear_tx_pending(local); 928 929 /* 930 * If the interface goes down while suspended, presumably because 931 * the device was unplugged and that happens before our resume, 932 * then the driver is already unconfigured and the remainder of 933 * this function isn't needed. 934 * XXX: what about WoWLAN? If the device has software state, e.g. 935 * memory allocated, it might expect teardown commands from 936 * mac80211 here? 937 */ 938 if (local->suspended) { 939 WARN_ON(local->wowlan); 940 WARN_ON(rtnl_dereference(local->monitor_sdata)); 941 return; 942 } 943 944 switch (sdata->vif.type) { 945 case NL80211_IFTYPE_AP_VLAN: 946 break; 947 case NL80211_IFTYPE_MONITOR: 948 if (local->monitors == 0) 949 ieee80211_del_virtual_monitor(local); 950 951 mutex_lock(&local->mtx); 952 ieee80211_recalc_idle(local); 953 mutex_unlock(&local->mtx); 954 955 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 956 break; 957 958 /* fall through */ 959 default: 960 if (going_down) 961 drv_remove_interface(local, sdata); 962 } 963 964 ieee80211_recalc_ps(local, -1); 965 966 if (local->open_count == 0) { 967 ieee80211_stop_device(local); 968 969 /* no reconfiguring after stop! */ 970 return; 971 } 972 973 /* do after stop to avoid reconfiguring when we stop anyway */ 974 ieee80211_configure_filter(local); 975 ieee80211_hw_config(local, hw_reconf_flags); 976 977 if (local->monitors == local->open_count) 978 ieee80211_add_virtual_monitor(local); 979 } 980 981 static int ieee80211_stop(struct net_device *dev) 982 { 983 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 984 985 ieee80211_do_stop(sdata, true); 986 987 return 0; 988 } 989 990 static void ieee80211_set_multicast_list(struct net_device *dev) 991 { 992 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 993 struct ieee80211_local *local = sdata->local; 994 int allmulti, promisc, sdata_allmulti, sdata_promisc; 995 996 allmulti = !!(dev->flags & IFF_ALLMULTI); 997 promisc = !!(dev->flags & IFF_PROMISC); 998 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 999 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 1000 1001 if (allmulti != sdata_allmulti) { 1002 if (dev->flags & IFF_ALLMULTI) 1003 atomic_inc(&local->iff_allmultis); 1004 else 1005 atomic_dec(&local->iff_allmultis); 1006 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1007 } 1008 1009 if (promisc != sdata_promisc) { 1010 if (dev->flags & IFF_PROMISC) 1011 atomic_inc(&local->iff_promiscs); 1012 else 1013 atomic_dec(&local->iff_promiscs); 1014 sdata->flags ^= IEEE80211_SDATA_PROMISC; 1015 } 1016 1017 /* 1018 * TODO: If somebody needs this on AP interfaces, 1019 * it can be enabled easily but multicast 1020 * addresses from VLANs need to be synced. 1021 */ 1022 if (sdata->vif.type != NL80211_IFTYPE_MONITOR && 1023 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 1024 sdata->vif.type != NL80211_IFTYPE_AP) 1025 drv_set_multicast_list(local, sdata, &dev->mc); 1026 1027 spin_lock_bh(&local->filter_lock); 1028 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1029 spin_unlock_bh(&local->filter_lock); 1030 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1031 } 1032 1033 /* 1034 * Called when the netdev is removed or, by the code below, before 1035 * the interface type changes. 1036 */ 1037 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1038 { 1039 int flushed; 1040 int i; 1041 1042 /* free extra data */ 1043 ieee80211_free_keys(sdata); 1044 1045 ieee80211_debugfs_remove_netdev(sdata); 1046 1047 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1048 __skb_queue_purge(&sdata->fragments[i].skb_list); 1049 sdata->fragment_next = 0; 1050 1051 if (ieee80211_vif_is_mesh(&sdata->vif)) 1052 mesh_rmc_free(sdata); 1053 1054 flushed = sta_info_flush(sdata); 1055 WARN_ON(flushed); 1056 } 1057 1058 static void ieee80211_uninit(struct net_device *dev) 1059 { 1060 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1061 } 1062 1063 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1064 struct sk_buff *skb) 1065 { 1066 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1067 } 1068 1069 static const struct net_device_ops ieee80211_dataif_ops = { 1070 .ndo_open = ieee80211_open, 1071 .ndo_stop = ieee80211_stop, 1072 .ndo_uninit = ieee80211_uninit, 1073 .ndo_start_xmit = ieee80211_subif_start_xmit, 1074 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1075 .ndo_change_mtu = ieee80211_change_mtu, 1076 .ndo_set_mac_address = ieee80211_change_mac, 1077 .ndo_select_queue = ieee80211_netdev_select_queue, 1078 }; 1079 1080 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1081 struct sk_buff *skb) 1082 { 1083 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1084 struct ieee80211_local *local = sdata->local; 1085 struct ieee80211_hdr *hdr; 1086 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1087 1088 if (local->hw.queues < IEEE80211_NUM_ACS) 1089 return 0; 1090 1091 if (skb->len < 4 || 1092 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1093 return 0; /* doesn't matter, frame will be dropped */ 1094 1095 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1096 1097 return ieee80211_select_queue_80211(sdata, skb, hdr); 1098 } 1099 1100 static const struct net_device_ops ieee80211_monitorif_ops = { 1101 .ndo_open = ieee80211_open, 1102 .ndo_stop = ieee80211_stop, 1103 .ndo_uninit = ieee80211_uninit, 1104 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1105 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1106 .ndo_change_mtu = ieee80211_change_mtu, 1107 .ndo_set_mac_address = ieee80211_change_mac, 1108 .ndo_select_queue = ieee80211_monitor_select_queue, 1109 }; 1110 1111 static void ieee80211_if_setup(struct net_device *dev) 1112 { 1113 ether_setup(dev); 1114 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1115 dev->netdev_ops = &ieee80211_dataif_ops; 1116 dev->destructor = free_netdev; 1117 } 1118 1119 static void ieee80211_iface_work(struct work_struct *work) 1120 { 1121 struct ieee80211_sub_if_data *sdata = 1122 container_of(work, struct ieee80211_sub_if_data, work); 1123 struct ieee80211_local *local = sdata->local; 1124 struct sk_buff *skb; 1125 struct sta_info *sta; 1126 struct ieee80211_ra_tid *ra_tid; 1127 1128 if (!ieee80211_sdata_running(sdata)) 1129 return; 1130 1131 if (local->scanning) 1132 return; 1133 1134 /* 1135 * ieee80211_queue_work() should have picked up most cases, 1136 * here we'll pick the rest. 1137 */ 1138 if (WARN(local->suspended, 1139 "interface work scheduled while going to suspend\n")) 1140 return; 1141 1142 /* first process frames */ 1143 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1144 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1145 1146 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1147 ra_tid = (void *)&skb->cb; 1148 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1149 ra_tid->tid); 1150 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1151 ra_tid = (void *)&skb->cb; 1152 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1153 ra_tid->tid); 1154 } else if (ieee80211_is_action(mgmt->frame_control) && 1155 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1156 int len = skb->len; 1157 1158 mutex_lock(&local->sta_mtx); 1159 sta = sta_info_get_bss(sdata, mgmt->sa); 1160 if (sta) { 1161 switch (mgmt->u.action.u.addba_req.action_code) { 1162 case WLAN_ACTION_ADDBA_REQ: 1163 ieee80211_process_addba_request( 1164 local, sta, mgmt, len); 1165 break; 1166 case WLAN_ACTION_ADDBA_RESP: 1167 ieee80211_process_addba_resp(local, sta, 1168 mgmt, len); 1169 break; 1170 case WLAN_ACTION_DELBA: 1171 ieee80211_process_delba(sdata, sta, 1172 mgmt, len); 1173 break; 1174 default: 1175 WARN_ON(1); 1176 break; 1177 } 1178 } 1179 mutex_unlock(&local->sta_mtx); 1180 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1181 struct ieee80211_hdr *hdr = (void *)mgmt; 1182 /* 1183 * So the frame isn't mgmt, but frame_control 1184 * is at the right place anyway, of course, so 1185 * the if statement is correct. 1186 * 1187 * Warn if we have other data frame types here, 1188 * they must not get here. 1189 */ 1190 WARN_ON(hdr->frame_control & 1191 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1192 WARN_ON(!(hdr->seq_ctrl & 1193 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1194 /* 1195 * This was a fragment of a frame, received while 1196 * a block-ack session was active. That cannot be 1197 * right, so terminate the session. 1198 */ 1199 mutex_lock(&local->sta_mtx); 1200 sta = sta_info_get_bss(sdata, mgmt->sa); 1201 if (sta) { 1202 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1203 IEEE80211_QOS_CTL_TID_MASK; 1204 1205 __ieee80211_stop_rx_ba_session( 1206 sta, tid, WLAN_BACK_RECIPIENT, 1207 WLAN_REASON_QSTA_REQUIRE_SETUP, 1208 true); 1209 } 1210 mutex_unlock(&local->sta_mtx); 1211 } else switch (sdata->vif.type) { 1212 case NL80211_IFTYPE_STATION: 1213 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1214 break; 1215 case NL80211_IFTYPE_ADHOC: 1216 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1217 break; 1218 case NL80211_IFTYPE_MESH_POINT: 1219 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1220 break; 1221 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1222 break; 1223 default: 1224 WARN(1, "frame for unexpected interface type"); 1225 break; 1226 } 1227 1228 kfree_skb(skb); 1229 } 1230 1231 /* then other type-dependent work */ 1232 switch (sdata->vif.type) { 1233 case NL80211_IFTYPE_STATION: 1234 ieee80211_sta_work(sdata); 1235 break; 1236 case NL80211_IFTYPE_ADHOC: 1237 ieee80211_ibss_work(sdata); 1238 break; 1239 case NL80211_IFTYPE_MESH_POINT: 1240 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1241 break; 1242 ieee80211_mesh_work(sdata); 1243 break; 1244 default: 1245 break; 1246 } 1247 } 1248 1249 static void ieee80211_recalc_smps_work(struct work_struct *work) 1250 { 1251 struct ieee80211_sub_if_data *sdata = 1252 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1253 1254 ieee80211_recalc_smps(sdata); 1255 } 1256 1257 /* 1258 * Helper function to initialise an interface to a specific type. 1259 */ 1260 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1261 enum nl80211_iftype type) 1262 { 1263 /* clear type-dependent union */ 1264 memset(&sdata->u, 0, sizeof(sdata->u)); 1265 1266 /* and set some type-dependent values */ 1267 sdata->vif.type = type; 1268 sdata->vif.p2p = false; 1269 sdata->wdev.iftype = type; 1270 1271 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1272 sdata->control_port_no_encrypt = false; 1273 1274 sdata->noack_map = 0; 1275 1276 /* only monitor/p2p-device differ */ 1277 if (sdata->dev) { 1278 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1279 sdata->dev->type = ARPHRD_ETHER; 1280 } 1281 1282 skb_queue_head_init(&sdata->skb_queue); 1283 INIT_WORK(&sdata->work, ieee80211_iface_work); 1284 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1285 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1286 1287 switch (type) { 1288 case NL80211_IFTYPE_P2P_GO: 1289 type = NL80211_IFTYPE_AP; 1290 sdata->vif.type = type; 1291 sdata->vif.p2p = true; 1292 /* fall through */ 1293 case NL80211_IFTYPE_AP: 1294 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1295 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1296 INIT_WORK(&sdata->u.ap.request_smps_work, 1297 ieee80211_request_smps_ap_work); 1298 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1299 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1300 break; 1301 case NL80211_IFTYPE_P2P_CLIENT: 1302 type = NL80211_IFTYPE_STATION; 1303 sdata->vif.type = type; 1304 sdata->vif.p2p = true; 1305 /* fall through */ 1306 case NL80211_IFTYPE_STATION: 1307 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1308 ieee80211_sta_setup_sdata(sdata); 1309 break; 1310 case NL80211_IFTYPE_ADHOC: 1311 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1312 ieee80211_ibss_setup_sdata(sdata); 1313 break; 1314 case NL80211_IFTYPE_MESH_POINT: 1315 if (ieee80211_vif_is_mesh(&sdata->vif)) 1316 ieee80211_mesh_init_sdata(sdata); 1317 break; 1318 case NL80211_IFTYPE_MONITOR: 1319 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1320 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1321 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1322 MONITOR_FLAG_OTHER_BSS; 1323 break; 1324 case NL80211_IFTYPE_WDS: 1325 sdata->vif.bss_conf.bssid = NULL; 1326 break; 1327 case NL80211_IFTYPE_AP_VLAN: 1328 case NL80211_IFTYPE_P2P_DEVICE: 1329 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1330 break; 1331 case NL80211_IFTYPE_UNSPECIFIED: 1332 case NUM_NL80211_IFTYPES: 1333 BUG(); 1334 break; 1335 } 1336 1337 ieee80211_debugfs_add_netdev(sdata); 1338 } 1339 1340 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1341 enum nl80211_iftype type) 1342 { 1343 struct ieee80211_local *local = sdata->local; 1344 int ret, err; 1345 enum nl80211_iftype internal_type = type; 1346 bool p2p = false; 1347 1348 ASSERT_RTNL(); 1349 1350 if (!local->ops->change_interface) 1351 return -EBUSY; 1352 1353 switch (sdata->vif.type) { 1354 case NL80211_IFTYPE_AP: 1355 case NL80211_IFTYPE_STATION: 1356 case NL80211_IFTYPE_ADHOC: 1357 /* 1358 * Could maybe also all others here? 1359 * Just not sure how that interacts 1360 * with the RX/config path e.g. for 1361 * mesh. 1362 */ 1363 break; 1364 default: 1365 return -EBUSY; 1366 } 1367 1368 switch (type) { 1369 case NL80211_IFTYPE_AP: 1370 case NL80211_IFTYPE_STATION: 1371 case NL80211_IFTYPE_ADHOC: 1372 /* 1373 * Could probably support everything 1374 * but WDS here (WDS do_open can fail 1375 * under memory pressure, which this 1376 * code isn't prepared to handle). 1377 */ 1378 break; 1379 case NL80211_IFTYPE_P2P_CLIENT: 1380 p2p = true; 1381 internal_type = NL80211_IFTYPE_STATION; 1382 break; 1383 case NL80211_IFTYPE_P2P_GO: 1384 p2p = true; 1385 internal_type = NL80211_IFTYPE_AP; 1386 break; 1387 default: 1388 return -EBUSY; 1389 } 1390 1391 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1392 if (ret) 1393 return ret; 1394 1395 ieee80211_do_stop(sdata, false); 1396 1397 ieee80211_teardown_sdata(sdata); 1398 1399 ret = drv_change_interface(local, sdata, internal_type, p2p); 1400 if (ret) 1401 type = ieee80211_vif_type_p2p(&sdata->vif); 1402 1403 /* 1404 * Ignore return value here, there's not much we can do since 1405 * the driver changed the interface type internally already. 1406 * The warnings will hopefully make driver authors fix it :-) 1407 */ 1408 ieee80211_check_queues(sdata, type); 1409 1410 ieee80211_setup_sdata(sdata, type); 1411 1412 err = ieee80211_do_open(&sdata->wdev, false); 1413 WARN(err, "type change: do_open returned %d", err); 1414 1415 return ret; 1416 } 1417 1418 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1419 enum nl80211_iftype type) 1420 { 1421 int ret; 1422 1423 ASSERT_RTNL(); 1424 1425 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1426 return 0; 1427 1428 if (ieee80211_sdata_running(sdata)) { 1429 ret = ieee80211_runtime_change_iftype(sdata, type); 1430 if (ret) 1431 return ret; 1432 } else { 1433 /* Purge and reset type-dependent state. */ 1434 ieee80211_teardown_sdata(sdata); 1435 ieee80211_setup_sdata(sdata, type); 1436 } 1437 1438 /* reset some values that shouldn't be kept across type changes */ 1439 sdata->drop_unencrypted = 0; 1440 if (type == NL80211_IFTYPE_STATION) 1441 sdata->u.mgd.use_4addr = false; 1442 1443 return 0; 1444 } 1445 1446 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1447 u8 *perm_addr, enum nl80211_iftype type) 1448 { 1449 struct ieee80211_sub_if_data *sdata; 1450 u64 mask, start, addr, val, inc; 1451 u8 *m; 1452 u8 tmp_addr[ETH_ALEN]; 1453 int i; 1454 1455 /* default ... something at least */ 1456 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1457 1458 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1459 local->hw.wiphy->n_addresses <= 1) 1460 return; 1461 1462 mutex_lock(&local->iflist_mtx); 1463 1464 switch (type) { 1465 case NL80211_IFTYPE_MONITOR: 1466 /* doesn't matter */ 1467 break; 1468 case NL80211_IFTYPE_WDS: 1469 case NL80211_IFTYPE_AP_VLAN: 1470 /* match up with an AP interface */ 1471 list_for_each_entry(sdata, &local->interfaces, list) { 1472 if (sdata->vif.type != NL80211_IFTYPE_AP) 1473 continue; 1474 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1475 break; 1476 } 1477 /* keep default if no AP interface present */ 1478 break; 1479 case NL80211_IFTYPE_P2P_CLIENT: 1480 case NL80211_IFTYPE_P2P_GO: 1481 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1482 list_for_each_entry(sdata, &local->interfaces, list) { 1483 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1484 continue; 1485 if (!ieee80211_sdata_running(sdata)) 1486 continue; 1487 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1488 goto out_unlock; 1489 } 1490 } 1491 /* otherwise fall through */ 1492 default: 1493 /* assign a new address if possible -- try n_addresses first */ 1494 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1495 bool used = false; 1496 1497 list_for_each_entry(sdata, &local->interfaces, list) { 1498 if (memcmp(local->hw.wiphy->addresses[i].addr, 1499 sdata->vif.addr, ETH_ALEN) == 0) { 1500 used = true; 1501 break; 1502 } 1503 } 1504 1505 if (!used) { 1506 memcpy(perm_addr, 1507 local->hw.wiphy->addresses[i].addr, 1508 ETH_ALEN); 1509 break; 1510 } 1511 } 1512 1513 /* try mask if available */ 1514 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1515 break; 1516 1517 m = local->hw.wiphy->addr_mask; 1518 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1519 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1520 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1521 1522 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1523 /* not a contiguous mask ... not handled now! */ 1524 pr_info("not contiguous\n"); 1525 break; 1526 } 1527 1528 /* 1529 * Pick address of existing interface in case user changed 1530 * MAC address manually, default to perm_addr. 1531 */ 1532 m = local->hw.wiphy->perm_addr; 1533 list_for_each_entry(sdata, &local->interfaces, list) { 1534 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1535 continue; 1536 m = sdata->vif.addr; 1537 break; 1538 } 1539 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1540 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1541 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1542 1543 inc = 1ULL<<__ffs64(mask); 1544 val = (start & mask); 1545 addr = (start & ~mask) | (val & mask); 1546 do { 1547 bool used = false; 1548 1549 tmp_addr[5] = addr >> 0*8; 1550 tmp_addr[4] = addr >> 1*8; 1551 tmp_addr[3] = addr >> 2*8; 1552 tmp_addr[2] = addr >> 3*8; 1553 tmp_addr[1] = addr >> 4*8; 1554 tmp_addr[0] = addr >> 5*8; 1555 1556 val += inc; 1557 1558 list_for_each_entry(sdata, &local->interfaces, list) { 1559 if (memcmp(tmp_addr, sdata->vif.addr, 1560 ETH_ALEN) == 0) { 1561 used = true; 1562 break; 1563 } 1564 } 1565 1566 if (!used) { 1567 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1568 break; 1569 } 1570 addr = (start & ~mask) | (val & mask); 1571 } while (addr != start); 1572 1573 break; 1574 } 1575 1576 out_unlock: 1577 mutex_unlock(&local->iflist_mtx); 1578 } 1579 1580 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk) 1581 { 1582 struct ieee80211_sub_if_data *sdata; 1583 1584 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk); 1585 1586 ieee80211_cleanup_sdata_stas(sdata); 1587 } 1588 1589 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1590 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1591 struct vif_params *params) 1592 { 1593 struct net_device *ndev = NULL; 1594 struct ieee80211_sub_if_data *sdata = NULL; 1595 int ret, i; 1596 int txqs = 1; 1597 1598 ASSERT_RTNL(); 1599 1600 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1601 struct wireless_dev *wdev; 1602 1603 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1604 GFP_KERNEL); 1605 if (!sdata) 1606 return -ENOMEM; 1607 wdev = &sdata->wdev; 1608 1609 sdata->dev = NULL; 1610 strlcpy(sdata->name, name, IFNAMSIZ); 1611 ieee80211_assign_perm_addr(local, wdev->address, type); 1612 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1613 } else { 1614 if (local->hw.queues >= IEEE80211_NUM_ACS) 1615 txqs = IEEE80211_NUM_ACS; 1616 1617 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1618 local->hw.vif_data_size, 1619 name, ieee80211_if_setup, txqs, 1); 1620 if (!ndev) 1621 return -ENOMEM; 1622 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1623 1624 ndev->needed_headroom = local->tx_headroom + 1625 4*6 /* four MAC addresses */ 1626 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1627 + 6 /* mesh */ 1628 + 8 /* rfc1042/bridge tunnel */ 1629 - ETH_HLEN /* ethernet hard_header_len */ 1630 + IEEE80211_ENCRYPT_HEADROOM; 1631 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1632 1633 ret = dev_alloc_name(ndev, ndev->name); 1634 if (ret < 0) { 1635 free_netdev(ndev); 1636 return ret; 1637 } 1638 1639 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1640 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1641 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1642 1643 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1644 sdata = netdev_priv(ndev); 1645 ndev->ieee80211_ptr = &sdata->wdev; 1646 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1647 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1648 1649 sdata->dev = ndev; 1650 } 1651 1652 /* initialise type-independent data */ 1653 sdata->wdev.wiphy = local->hw.wiphy; 1654 sdata->local = local; 1655 1656 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1657 skb_queue_head_init(&sdata->fragments[i].skb_list); 1658 1659 INIT_LIST_HEAD(&sdata->key_list); 1660 1661 spin_lock_init(&sdata->cleanup_stations_lock); 1662 INIT_LIST_HEAD(&sdata->cleanup_stations); 1663 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk); 1664 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1665 ieee80211_dfs_cac_timer_work); 1666 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1667 ieee80211_delayed_tailroom_dec); 1668 1669 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1670 struct ieee80211_supported_band *sband; 1671 sband = local->hw.wiphy->bands[i]; 1672 sdata->rc_rateidx_mask[i] = 1673 sband ? (1 << sband->n_bitrates) - 1 : 0; 1674 if (sband) 1675 memcpy(sdata->rc_rateidx_mcs_mask[i], 1676 sband->ht_cap.mcs.rx_mask, 1677 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1678 else 1679 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1680 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1681 } 1682 1683 ieee80211_set_default_queues(sdata); 1684 1685 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1686 sdata->user_power_level = local->user_power_level; 1687 1688 /* setup type-dependent data */ 1689 ieee80211_setup_sdata(sdata, type); 1690 1691 if (ndev) { 1692 if (params) { 1693 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1694 if (type == NL80211_IFTYPE_STATION) 1695 sdata->u.mgd.use_4addr = params->use_4addr; 1696 } 1697 1698 ndev->features |= local->hw.netdev_features; 1699 1700 ret = register_netdevice(ndev); 1701 if (ret) { 1702 free_netdev(ndev); 1703 return ret; 1704 } 1705 } 1706 1707 mutex_lock(&local->iflist_mtx); 1708 list_add_tail_rcu(&sdata->list, &local->interfaces); 1709 mutex_unlock(&local->iflist_mtx); 1710 1711 if (new_wdev) 1712 *new_wdev = &sdata->wdev; 1713 1714 return 0; 1715 } 1716 1717 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1718 { 1719 ASSERT_RTNL(); 1720 1721 mutex_lock(&sdata->local->iflist_mtx); 1722 list_del_rcu(&sdata->list); 1723 mutex_unlock(&sdata->local->iflist_mtx); 1724 1725 synchronize_rcu(); 1726 1727 if (sdata->dev) { 1728 unregister_netdevice(sdata->dev); 1729 } else { 1730 cfg80211_unregister_wdev(&sdata->wdev); 1731 kfree(sdata); 1732 } 1733 } 1734 1735 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1736 { 1737 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1738 return; 1739 ieee80211_do_stop(sdata, true); 1740 ieee80211_teardown_sdata(sdata); 1741 } 1742 1743 /* 1744 * Remove all interfaces, may only be called at hardware unregistration 1745 * time because it doesn't do RCU-safe list removals. 1746 */ 1747 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1748 { 1749 struct ieee80211_sub_if_data *sdata, *tmp; 1750 LIST_HEAD(unreg_list); 1751 LIST_HEAD(wdev_list); 1752 1753 ASSERT_RTNL(); 1754 1755 /* 1756 * Close all AP_VLAN interfaces first, as otherwise they 1757 * might be closed while the AP interface they belong to 1758 * is closed, causing unregister_netdevice_many() to crash. 1759 */ 1760 list_for_each_entry(sdata, &local->interfaces, list) 1761 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1762 dev_close(sdata->dev); 1763 1764 mutex_lock(&local->iflist_mtx); 1765 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1766 list_del(&sdata->list); 1767 1768 if (sdata->dev) 1769 unregister_netdevice_queue(sdata->dev, &unreg_list); 1770 else 1771 list_add(&sdata->list, &wdev_list); 1772 } 1773 mutex_unlock(&local->iflist_mtx); 1774 unregister_netdevice_many(&unreg_list); 1775 list_del(&unreg_list); 1776 1777 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1778 list_del(&sdata->list); 1779 cfg80211_unregister_wdev(&sdata->wdev); 1780 kfree(sdata); 1781 } 1782 } 1783 1784 static int netdev_notify(struct notifier_block *nb, 1785 unsigned long state, void *ptr) 1786 { 1787 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1788 struct ieee80211_sub_if_data *sdata; 1789 1790 if (state != NETDEV_CHANGENAME) 1791 return 0; 1792 1793 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1794 return 0; 1795 1796 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1797 return 0; 1798 1799 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1800 1801 memcpy(sdata->name, dev->name, IFNAMSIZ); 1802 1803 ieee80211_debugfs_rename_netdev(sdata); 1804 return 0; 1805 } 1806 1807 static struct notifier_block mac80211_netdev_notifier = { 1808 .notifier_call = netdev_notify, 1809 }; 1810 1811 int ieee80211_iface_init(void) 1812 { 1813 return register_netdevice_notifier(&mac80211_netdev_notifier); 1814 } 1815 1816 void ieee80211_iface_exit(void) 1817 { 1818 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1819 } 1820