1 /* 2 * Interface handling (except master interface) 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 46 static u32 ieee80211_idle_off(struct ieee80211_local *local, 47 const char *reason) 48 { 49 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 50 return 0; 51 52 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 53 return IEEE80211_CONF_CHANGE_IDLE; 54 } 55 56 static u32 ieee80211_idle_on(struct ieee80211_local *local) 57 { 58 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 59 return 0; 60 61 drv_flush(local, false); 62 63 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 64 return IEEE80211_CONF_CHANGE_IDLE; 65 } 66 67 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local) 68 { 69 struct ieee80211_sub_if_data *sdata; 70 int count = 0; 71 bool working = false, scanning = false; 72 unsigned int led_trig_start = 0, led_trig_stop = 0; 73 struct ieee80211_roc_work *roc; 74 75 #ifdef CONFIG_PROVE_LOCKING 76 WARN_ON(debug_locks && !lockdep_rtnl_is_held() && 77 !lockdep_is_held(&local->iflist_mtx)); 78 #endif 79 lockdep_assert_held(&local->mtx); 80 81 list_for_each_entry(sdata, &local->interfaces, list) { 82 if (!ieee80211_sdata_running(sdata)) { 83 sdata->vif.bss_conf.idle = true; 84 continue; 85 } 86 87 sdata->old_idle = sdata->vif.bss_conf.idle; 88 89 /* do not count disabled managed interfaces */ 90 if (sdata->vif.type == NL80211_IFTYPE_STATION && 91 !sdata->u.mgd.associated && 92 !sdata->u.mgd.auth_data && 93 !sdata->u.mgd.assoc_data) { 94 sdata->vif.bss_conf.idle = true; 95 continue; 96 } 97 /* do not count unused IBSS interfaces */ 98 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 99 !sdata->u.ibss.ssid_len) { 100 sdata->vif.bss_conf.idle = true; 101 continue; 102 } 103 /* count everything else */ 104 sdata->vif.bss_conf.idle = false; 105 count++; 106 } 107 108 if (!local->ops->remain_on_channel) { 109 list_for_each_entry(roc, &local->roc_list, list) { 110 working = true; 111 roc->sdata->vif.bss_conf.idle = false; 112 } 113 } 114 115 sdata = rcu_dereference_protected(local->scan_sdata, 116 lockdep_is_held(&local->mtx)); 117 if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) { 118 scanning = true; 119 sdata->vif.bss_conf.idle = false; 120 } 121 122 list_for_each_entry(sdata, &local->interfaces, list) { 123 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 124 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 125 continue; 126 if (sdata->old_idle == sdata->vif.bss_conf.idle) 127 continue; 128 if (!ieee80211_sdata_running(sdata)) 129 continue; 130 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE); 131 } 132 133 if (working || scanning) 134 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 135 else 136 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 137 138 if (count) 139 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 140 else 141 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 142 143 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 144 145 if (working) 146 return ieee80211_idle_off(local, "working"); 147 if (scanning) 148 return ieee80211_idle_off(local, "scanning"); 149 if (!count) 150 return ieee80211_idle_on(local); 151 else 152 return ieee80211_idle_off(local, "in use"); 153 154 return 0; 155 } 156 157 void ieee80211_recalc_idle(struct ieee80211_local *local) 158 { 159 u32 chg; 160 161 mutex_lock(&local->iflist_mtx); 162 chg = __ieee80211_recalc_idle(local); 163 mutex_unlock(&local->iflist_mtx); 164 if (chg) 165 ieee80211_hw_config(local, chg); 166 } 167 168 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 169 { 170 int meshhdrlen; 171 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 172 173 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0; 174 175 /* FIX: what would be proper limits for MTU? 176 * This interface uses 802.3 frames. */ 177 if (new_mtu < 256 || 178 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) { 179 return -EINVAL; 180 } 181 182 dev->mtu = new_mtu; 183 return 0; 184 } 185 186 static int ieee80211_change_mac(struct net_device *dev, void *addr) 187 { 188 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 189 struct sockaddr *sa = addr; 190 int ret; 191 192 if (ieee80211_sdata_running(sdata)) 193 return -EBUSY; 194 195 ret = eth_mac_addr(dev, sa); 196 197 if (ret == 0) 198 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 199 200 return ret; 201 } 202 203 static inline int identical_mac_addr_allowed(int type1, int type2) 204 { 205 return type1 == NL80211_IFTYPE_MONITOR || 206 type2 == NL80211_IFTYPE_MONITOR || 207 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 208 (type1 == NL80211_IFTYPE_WDS && 209 (type2 == NL80211_IFTYPE_WDS || 210 type2 == NL80211_IFTYPE_AP)) || 211 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 212 (type1 == NL80211_IFTYPE_AP_VLAN && 213 (type2 == NL80211_IFTYPE_AP || 214 type2 == NL80211_IFTYPE_AP_VLAN)); 215 } 216 217 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 218 enum nl80211_iftype iftype) 219 { 220 struct ieee80211_local *local = sdata->local; 221 struct ieee80211_sub_if_data *nsdata; 222 223 ASSERT_RTNL(); 224 225 /* we hold the RTNL here so can safely walk the list */ 226 list_for_each_entry(nsdata, &local->interfaces, list) { 227 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 228 /* 229 * Allow only a single IBSS interface to be up at any 230 * time. This is restricted because beacon distribution 231 * cannot work properly if both are in the same IBSS. 232 * 233 * To remove this restriction we'd have to disallow them 234 * from setting the same SSID on different IBSS interfaces 235 * belonging to the same hardware. Then, however, we're 236 * faced with having to adopt two different TSF timers... 237 */ 238 if (iftype == NL80211_IFTYPE_ADHOC && 239 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 240 return -EBUSY; 241 242 /* 243 * The remaining checks are only performed for interfaces 244 * with the same MAC address. 245 */ 246 if (!ether_addr_equal(sdata->vif.addr, 247 nsdata->vif.addr)) 248 continue; 249 250 /* 251 * check whether it may have the same address 252 */ 253 if (!identical_mac_addr_allowed(iftype, 254 nsdata->vif.type)) 255 return -ENOTUNIQ; 256 257 /* 258 * can only add VLANs to enabled APs 259 */ 260 if (iftype == NL80211_IFTYPE_AP_VLAN && 261 nsdata->vif.type == NL80211_IFTYPE_AP) 262 sdata->bss = &nsdata->u.ap; 263 } 264 } 265 266 return 0; 267 } 268 269 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata) 270 { 271 int n_queues = sdata->local->hw.queues; 272 int i; 273 274 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 275 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 276 IEEE80211_INVAL_HW_QUEUE)) 277 return -EINVAL; 278 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 279 n_queues)) 280 return -EINVAL; 281 } 282 283 if ((sdata->vif.type != NL80211_IFTYPE_AP) || 284 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { 285 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 286 return 0; 287 } 288 289 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 290 return -EINVAL; 291 292 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 293 return -EINVAL; 294 295 return 0; 296 } 297 298 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 299 const int offset) 300 { 301 struct ieee80211_local *local = sdata->local; 302 u32 flags = sdata->u.mntr_flags; 303 304 #define ADJUST(_f, _s) do { \ 305 if (flags & MONITOR_FLAG_##_f) \ 306 local->fif_##_s += offset; \ 307 } while (0) 308 309 ADJUST(FCSFAIL, fcsfail); 310 ADJUST(PLCPFAIL, plcpfail); 311 ADJUST(CONTROL, control); 312 ADJUST(CONTROL, pspoll); 313 ADJUST(OTHER_BSS, other_bss); 314 315 #undef ADJUST 316 } 317 318 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 319 { 320 struct ieee80211_local *local = sdata->local; 321 int i; 322 323 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 324 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 325 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 326 else if (local->hw.queues >= IEEE80211_NUM_ACS) 327 sdata->vif.hw_queue[i] = i; 328 else 329 sdata->vif.hw_queue[i] = 0; 330 } 331 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 332 } 333 334 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 335 { 336 struct ieee80211_sub_if_data *sdata; 337 int ret = 0; 338 339 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 340 return 0; 341 342 mutex_lock(&local->iflist_mtx); 343 344 if (local->monitor_sdata) 345 goto out_unlock; 346 347 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 348 if (!sdata) { 349 ret = -ENOMEM; 350 goto out_unlock; 351 } 352 353 /* set up data */ 354 sdata->local = local; 355 sdata->vif.type = NL80211_IFTYPE_MONITOR; 356 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 357 wiphy_name(local->hw.wiphy)); 358 359 ieee80211_set_default_queues(sdata); 360 361 ret = drv_add_interface(local, sdata); 362 if (WARN_ON(ret)) { 363 /* ok .. stupid driver, it asked for this! */ 364 kfree(sdata); 365 goto out_unlock; 366 } 367 368 ret = ieee80211_check_queues(sdata); 369 if (ret) { 370 kfree(sdata); 371 goto out_unlock; 372 } 373 374 rcu_assign_pointer(local->monitor_sdata, sdata); 375 out_unlock: 376 mutex_unlock(&local->iflist_mtx); 377 return ret; 378 } 379 380 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 381 { 382 struct ieee80211_sub_if_data *sdata; 383 384 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 385 return; 386 387 mutex_lock(&local->iflist_mtx); 388 389 sdata = rcu_dereference_protected(local->monitor_sdata, 390 lockdep_is_held(&local->iflist_mtx)); 391 if (!sdata) 392 goto out_unlock; 393 394 rcu_assign_pointer(local->monitor_sdata, NULL); 395 synchronize_net(); 396 397 drv_remove_interface(local, sdata); 398 399 kfree(sdata); 400 out_unlock: 401 mutex_unlock(&local->iflist_mtx); 402 } 403 404 /* 405 * NOTE: Be very careful when changing this function, it must NOT return 406 * an error on interface type changes that have been pre-checked, so most 407 * checks should be in ieee80211_check_concurrent_iface. 408 */ 409 static int ieee80211_do_open(struct net_device *dev, bool coming_up) 410 { 411 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 412 struct ieee80211_local *local = sdata->local; 413 struct sta_info *sta; 414 u32 changed = 0; 415 int res; 416 u32 hw_reconf_flags = 0; 417 418 switch (sdata->vif.type) { 419 case NL80211_IFTYPE_WDS: 420 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 421 return -ENOLINK; 422 break; 423 case NL80211_IFTYPE_AP_VLAN: { 424 struct ieee80211_sub_if_data *master; 425 426 if (!sdata->bss) 427 return -ENOLINK; 428 429 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 430 431 master = container_of(sdata->bss, 432 struct ieee80211_sub_if_data, u.ap); 433 sdata->control_port_protocol = 434 master->control_port_protocol; 435 sdata->control_port_no_encrypt = 436 master->control_port_no_encrypt; 437 break; 438 } 439 case NL80211_IFTYPE_AP: 440 sdata->bss = &sdata->u.ap; 441 break; 442 case NL80211_IFTYPE_MESH_POINT: 443 case NL80211_IFTYPE_STATION: 444 case NL80211_IFTYPE_MONITOR: 445 case NL80211_IFTYPE_ADHOC: 446 /* no special treatment */ 447 break; 448 case NL80211_IFTYPE_UNSPECIFIED: 449 case NUM_NL80211_IFTYPES: 450 case NL80211_IFTYPE_P2P_CLIENT: 451 case NL80211_IFTYPE_P2P_GO: 452 /* cannot happen */ 453 WARN_ON(1); 454 break; 455 } 456 457 if (local->open_count == 0) { 458 res = drv_start(local); 459 if (res) 460 goto err_del_bss; 461 if (local->ops->napi_poll) 462 napi_enable(&local->napi); 463 /* we're brought up, everything changes */ 464 hw_reconf_flags = ~0; 465 ieee80211_led_radio(local, true); 466 ieee80211_mod_tpt_led_trig(local, 467 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 468 } 469 470 /* 471 * Copy the hopefully now-present MAC address to 472 * this interface, if it has the special null one. 473 */ 474 if (is_zero_ether_addr(dev->dev_addr)) { 475 memcpy(dev->dev_addr, 476 local->hw.wiphy->perm_addr, 477 ETH_ALEN); 478 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 479 480 if (!is_valid_ether_addr(dev->dev_addr)) { 481 res = -EADDRNOTAVAIL; 482 goto err_stop; 483 } 484 } 485 486 switch (sdata->vif.type) { 487 case NL80211_IFTYPE_AP_VLAN: 488 /* no need to tell driver, but set carrier */ 489 if (rtnl_dereference(sdata->bss->beacon)) 490 netif_carrier_on(dev); 491 else 492 netif_carrier_off(dev); 493 break; 494 case NL80211_IFTYPE_MONITOR: 495 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 496 local->cooked_mntrs++; 497 break; 498 } 499 500 if (local->monitors == 0 && local->open_count == 0) { 501 res = ieee80211_add_virtual_monitor(local); 502 if (res) 503 goto err_stop; 504 } 505 506 /* must be before the call to ieee80211_configure_filter */ 507 local->monitors++; 508 if (local->monitors == 1) { 509 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 510 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 511 } 512 513 ieee80211_adjust_monitor_flags(sdata, 1); 514 ieee80211_configure_filter(local); 515 516 netif_carrier_on(dev); 517 break; 518 default: 519 if (coming_up) { 520 ieee80211_del_virtual_monitor(local); 521 522 res = drv_add_interface(local, sdata); 523 if (res) 524 goto err_stop; 525 res = ieee80211_check_queues(sdata); 526 if (res) 527 goto err_del_interface; 528 } 529 530 if (sdata->vif.type == NL80211_IFTYPE_AP) { 531 local->fif_pspoll++; 532 local->fif_probe_req++; 533 534 ieee80211_configure_filter(local); 535 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 536 local->fif_probe_req++; 537 } 538 539 changed |= ieee80211_reset_erp_info(sdata); 540 ieee80211_bss_info_change_notify(sdata, changed); 541 542 if (sdata->vif.type == NL80211_IFTYPE_STATION || 543 sdata->vif.type == NL80211_IFTYPE_ADHOC || 544 sdata->vif.type == NL80211_IFTYPE_AP) 545 netif_carrier_off(dev); 546 else 547 netif_carrier_on(dev); 548 549 /* 550 * set default queue parameters so drivers don't 551 * need to initialise the hardware if the hardware 552 * doesn't start up with sane defaults 553 */ 554 ieee80211_set_wmm_default(sdata, true); 555 } 556 557 set_bit(SDATA_STATE_RUNNING, &sdata->state); 558 559 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 560 /* Create STA entry for the WDS peer */ 561 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 562 GFP_KERNEL); 563 if (!sta) { 564 res = -ENOMEM; 565 goto err_del_interface; 566 } 567 568 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 569 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 570 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 571 572 res = sta_info_insert(sta); 573 if (res) { 574 /* STA has been freed */ 575 goto err_del_interface; 576 } 577 578 rate_control_rate_init(sta); 579 } 580 581 /* 582 * set_multicast_list will be invoked by the networking core 583 * which will check whether any increments here were done in 584 * error and sync them down to the hardware as filter flags. 585 */ 586 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 587 atomic_inc(&local->iff_allmultis); 588 589 if (sdata->flags & IEEE80211_SDATA_PROMISC) 590 atomic_inc(&local->iff_promiscs); 591 592 mutex_lock(&local->mtx); 593 hw_reconf_flags |= __ieee80211_recalc_idle(local); 594 mutex_unlock(&local->mtx); 595 596 if (coming_up) 597 local->open_count++; 598 599 if (hw_reconf_flags) 600 ieee80211_hw_config(local, hw_reconf_flags); 601 602 ieee80211_recalc_ps(local, -1); 603 604 netif_tx_start_all_queues(dev); 605 606 return 0; 607 err_del_interface: 608 drv_remove_interface(local, sdata); 609 err_stop: 610 if (!local->open_count) 611 drv_stop(local); 612 err_del_bss: 613 sdata->bss = NULL; 614 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 615 list_del(&sdata->u.vlan.list); 616 /* might already be clear but that doesn't matter */ 617 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 618 return res; 619 } 620 621 static int ieee80211_open(struct net_device *dev) 622 { 623 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 624 int err; 625 626 /* fail early if user set an invalid address */ 627 if (!is_valid_ether_addr(dev->dev_addr)) 628 return -EADDRNOTAVAIL; 629 630 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 631 if (err) 632 return err; 633 634 return ieee80211_do_open(dev, true); 635 } 636 637 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 638 bool going_down) 639 { 640 struct ieee80211_local *local = sdata->local; 641 unsigned long flags; 642 struct sk_buff *skb, *tmp; 643 u32 hw_reconf_flags = 0; 644 int i; 645 enum nl80211_channel_type orig_ct; 646 647 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 648 649 if (rcu_access_pointer(local->scan_sdata) == sdata) 650 ieee80211_scan_cancel(local); 651 652 /* 653 * Stop TX on this interface first. 654 */ 655 netif_tx_stop_all_queues(sdata->dev); 656 657 ieee80211_roc_purge(sdata); 658 659 /* 660 * Remove all stations associated with this interface. 661 * 662 * This must be done before calling ops->remove_interface() 663 * because otherwise we can later invoke ops->sta_notify() 664 * whenever the STAs are removed, and that invalidates driver 665 * assumptions about always getting a vif pointer that is valid 666 * (because if we remove a STA after ops->remove_interface() 667 * the driver will have removed the vif info already!) 668 * 669 * This is relevant only in AP, WDS and mesh modes, since in 670 * all other modes we've already removed all stations when 671 * disconnecting etc. 672 */ 673 sta_info_flush(local, sdata); 674 675 /* 676 * Don't count this interface for promisc/allmulti while it 677 * is down. dev_mc_unsync() will invoke set_multicast_list 678 * on the master interface which will sync these down to the 679 * hardware as filter flags. 680 */ 681 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 682 atomic_dec(&local->iff_allmultis); 683 684 if (sdata->flags & IEEE80211_SDATA_PROMISC) 685 atomic_dec(&local->iff_promiscs); 686 687 if (sdata->vif.type == NL80211_IFTYPE_AP) { 688 local->fif_pspoll--; 689 local->fif_probe_req--; 690 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 691 local->fif_probe_req--; 692 } 693 694 netif_addr_lock_bh(sdata->dev); 695 spin_lock_bh(&local->filter_lock); 696 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 697 sdata->dev->addr_len); 698 spin_unlock_bh(&local->filter_lock); 699 netif_addr_unlock_bh(sdata->dev); 700 701 ieee80211_configure_filter(local); 702 703 del_timer_sync(&local->dynamic_ps_timer); 704 cancel_work_sync(&local->dynamic_ps_enable_work); 705 706 /* APs need special treatment */ 707 if (sdata->vif.type == NL80211_IFTYPE_AP) { 708 struct ieee80211_sub_if_data *vlan, *tmpsdata; 709 struct beacon_data *old_beacon = 710 rtnl_dereference(sdata->u.ap.beacon); 711 struct sk_buff *old_probe_resp = 712 rtnl_dereference(sdata->u.ap.probe_resp); 713 714 /* sdata_running will return false, so this will disable */ 715 ieee80211_bss_info_change_notify(sdata, 716 BSS_CHANGED_BEACON_ENABLED); 717 718 /* remove beacon and probe response */ 719 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL); 720 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL); 721 synchronize_rcu(); 722 kfree(old_beacon); 723 kfree_skb(old_probe_resp); 724 725 /* down all dependent devices, that is VLANs */ 726 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 727 u.vlan.list) 728 dev_close(vlan->dev); 729 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 730 731 /* free all potentially still buffered bcast frames */ 732 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf); 733 skb_queue_purge(&sdata->u.ap.ps_bc_buf); 734 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) { 735 ieee80211_mgd_stop(sdata); 736 } 737 738 if (going_down) 739 local->open_count--; 740 741 switch (sdata->vif.type) { 742 case NL80211_IFTYPE_AP_VLAN: 743 list_del(&sdata->u.vlan.list); 744 /* no need to tell driver */ 745 break; 746 case NL80211_IFTYPE_MONITOR: 747 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 748 local->cooked_mntrs--; 749 break; 750 } 751 752 local->monitors--; 753 if (local->monitors == 0) { 754 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 755 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 756 ieee80211_del_virtual_monitor(local); 757 } 758 759 ieee80211_adjust_monitor_flags(sdata, -1); 760 ieee80211_configure_filter(local); 761 break; 762 default: 763 flush_work(&sdata->work); 764 /* 765 * When we get here, the interface is marked down. 766 * Call synchronize_rcu() to wait for the RX path 767 * should it be using the interface and enqueuing 768 * frames at this very time on another CPU. 769 */ 770 synchronize_rcu(); 771 skb_queue_purge(&sdata->skb_queue); 772 773 /* 774 * Disable beaconing here for mesh only, AP and IBSS 775 * are already taken care of. 776 */ 777 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 778 ieee80211_bss_info_change_notify(sdata, 779 BSS_CHANGED_BEACON_ENABLED); 780 781 /* 782 * Free all remaining keys, there shouldn't be any, 783 * except maybe group keys in AP more or WDS? 784 */ 785 ieee80211_free_keys(sdata); 786 787 if (going_down) 788 drv_remove_interface(local, sdata); 789 } 790 791 sdata->bss = NULL; 792 793 mutex_lock(&local->mtx); 794 hw_reconf_flags |= __ieee80211_recalc_idle(local); 795 mutex_unlock(&local->mtx); 796 797 ieee80211_recalc_ps(local, -1); 798 799 if (local->open_count == 0) { 800 if (local->ops->napi_poll) 801 napi_disable(&local->napi); 802 ieee80211_clear_tx_pending(local); 803 ieee80211_stop_device(local); 804 805 /* no reconfiguring after stop! */ 806 hw_reconf_flags = 0; 807 } 808 809 /* Re-calculate channel-type, in case there are multiple vifs 810 * on different channel types. 811 */ 812 orig_ct = local->_oper_channel_type; 813 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT); 814 815 /* do after stop to avoid reconfiguring when we stop anyway */ 816 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type)) 817 ieee80211_hw_config(local, hw_reconf_flags); 818 819 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 820 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 821 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 822 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 823 if (info->control.vif == &sdata->vif) { 824 __skb_unlink(skb, &local->pending[i]); 825 dev_kfree_skb_irq(skb); 826 } 827 } 828 } 829 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 830 831 if (local->monitors == local->open_count && local->monitors > 0) 832 ieee80211_add_virtual_monitor(local); 833 } 834 835 static int ieee80211_stop(struct net_device *dev) 836 { 837 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 838 839 ieee80211_do_stop(sdata, true); 840 841 return 0; 842 } 843 844 static void ieee80211_set_multicast_list(struct net_device *dev) 845 { 846 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 847 struct ieee80211_local *local = sdata->local; 848 int allmulti, promisc, sdata_allmulti, sdata_promisc; 849 850 allmulti = !!(dev->flags & IFF_ALLMULTI); 851 promisc = !!(dev->flags & IFF_PROMISC); 852 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 853 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 854 855 if (allmulti != sdata_allmulti) { 856 if (dev->flags & IFF_ALLMULTI) 857 atomic_inc(&local->iff_allmultis); 858 else 859 atomic_dec(&local->iff_allmultis); 860 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 861 } 862 863 if (promisc != sdata_promisc) { 864 if (dev->flags & IFF_PROMISC) 865 atomic_inc(&local->iff_promiscs); 866 else 867 atomic_dec(&local->iff_promiscs); 868 sdata->flags ^= IEEE80211_SDATA_PROMISC; 869 } 870 spin_lock_bh(&local->filter_lock); 871 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 872 spin_unlock_bh(&local->filter_lock); 873 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 874 } 875 876 /* 877 * Called when the netdev is removed or, by the code below, before 878 * the interface type changes. 879 */ 880 static void ieee80211_teardown_sdata(struct net_device *dev) 881 { 882 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 883 struct ieee80211_local *local = sdata->local; 884 int flushed; 885 int i; 886 887 /* free extra data */ 888 ieee80211_free_keys(sdata); 889 890 ieee80211_debugfs_remove_netdev(sdata); 891 892 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 893 __skb_queue_purge(&sdata->fragments[i].skb_list); 894 sdata->fragment_next = 0; 895 896 if (ieee80211_vif_is_mesh(&sdata->vif)) 897 mesh_rmc_free(sdata); 898 899 flushed = sta_info_flush(local, sdata); 900 WARN_ON(flushed); 901 } 902 903 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 904 struct sk_buff *skb) 905 { 906 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 907 } 908 909 static const struct net_device_ops ieee80211_dataif_ops = { 910 .ndo_open = ieee80211_open, 911 .ndo_stop = ieee80211_stop, 912 .ndo_uninit = ieee80211_teardown_sdata, 913 .ndo_start_xmit = ieee80211_subif_start_xmit, 914 .ndo_set_rx_mode = ieee80211_set_multicast_list, 915 .ndo_change_mtu = ieee80211_change_mtu, 916 .ndo_set_mac_address = ieee80211_change_mac, 917 .ndo_select_queue = ieee80211_netdev_select_queue, 918 }; 919 920 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 921 struct sk_buff *skb) 922 { 923 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 924 struct ieee80211_local *local = sdata->local; 925 struct ieee80211_hdr *hdr; 926 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 927 928 if (local->hw.queues < IEEE80211_NUM_ACS) 929 return 0; 930 931 if (skb->len < 4 || 932 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 933 return 0; /* doesn't matter, frame will be dropped */ 934 935 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 936 937 return ieee80211_select_queue_80211(sdata, skb, hdr); 938 } 939 940 static const struct net_device_ops ieee80211_monitorif_ops = { 941 .ndo_open = ieee80211_open, 942 .ndo_stop = ieee80211_stop, 943 .ndo_uninit = ieee80211_teardown_sdata, 944 .ndo_start_xmit = ieee80211_monitor_start_xmit, 945 .ndo_set_rx_mode = ieee80211_set_multicast_list, 946 .ndo_change_mtu = ieee80211_change_mtu, 947 .ndo_set_mac_address = eth_mac_addr, 948 .ndo_select_queue = ieee80211_monitor_select_queue, 949 }; 950 951 static void ieee80211_if_setup(struct net_device *dev) 952 { 953 ether_setup(dev); 954 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 955 dev->netdev_ops = &ieee80211_dataif_ops; 956 dev->destructor = free_netdev; 957 } 958 959 static void ieee80211_iface_work(struct work_struct *work) 960 { 961 struct ieee80211_sub_if_data *sdata = 962 container_of(work, struct ieee80211_sub_if_data, work); 963 struct ieee80211_local *local = sdata->local; 964 struct sk_buff *skb; 965 struct sta_info *sta; 966 struct ieee80211_ra_tid *ra_tid; 967 968 if (!ieee80211_sdata_running(sdata)) 969 return; 970 971 if (local->scanning) 972 return; 973 974 /* 975 * ieee80211_queue_work() should have picked up most cases, 976 * here we'll pick the rest. 977 */ 978 if (WARN(local->suspended, 979 "interface work scheduled while going to suspend\n")) 980 return; 981 982 /* first process frames */ 983 while ((skb = skb_dequeue(&sdata->skb_queue))) { 984 struct ieee80211_mgmt *mgmt = (void *)skb->data; 985 986 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 987 ra_tid = (void *)&skb->cb; 988 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 989 ra_tid->tid); 990 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 991 ra_tid = (void *)&skb->cb; 992 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 993 ra_tid->tid); 994 } else if (ieee80211_is_action(mgmt->frame_control) && 995 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 996 int len = skb->len; 997 998 mutex_lock(&local->sta_mtx); 999 sta = sta_info_get_bss(sdata, mgmt->sa); 1000 if (sta) { 1001 switch (mgmt->u.action.u.addba_req.action_code) { 1002 case WLAN_ACTION_ADDBA_REQ: 1003 ieee80211_process_addba_request( 1004 local, sta, mgmt, len); 1005 break; 1006 case WLAN_ACTION_ADDBA_RESP: 1007 ieee80211_process_addba_resp(local, sta, 1008 mgmt, len); 1009 break; 1010 case WLAN_ACTION_DELBA: 1011 ieee80211_process_delba(sdata, sta, 1012 mgmt, len); 1013 break; 1014 default: 1015 WARN_ON(1); 1016 break; 1017 } 1018 } 1019 mutex_unlock(&local->sta_mtx); 1020 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1021 struct ieee80211_hdr *hdr = (void *)mgmt; 1022 /* 1023 * So the frame isn't mgmt, but frame_control 1024 * is at the right place anyway, of course, so 1025 * the if statement is correct. 1026 * 1027 * Warn if we have other data frame types here, 1028 * they must not get here. 1029 */ 1030 WARN_ON(hdr->frame_control & 1031 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1032 WARN_ON(!(hdr->seq_ctrl & 1033 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1034 /* 1035 * This was a fragment of a frame, received while 1036 * a block-ack session was active. That cannot be 1037 * right, so terminate the session. 1038 */ 1039 mutex_lock(&local->sta_mtx); 1040 sta = sta_info_get_bss(sdata, mgmt->sa); 1041 if (sta) { 1042 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1043 IEEE80211_QOS_CTL_TID_MASK; 1044 1045 __ieee80211_stop_rx_ba_session( 1046 sta, tid, WLAN_BACK_RECIPIENT, 1047 WLAN_REASON_QSTA_REQUIRE_SETUP, 1048 true); 1049 } 1050 mutex_unlock(&local->sta_mtx); 1051 } else switch (sdata->vif.type) { 1052 case NL80211_IFTYPE_STATION: 1053 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1054 break; 1055 case NL80211_IFTYPE_ADHOC: 1056 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1057 break; 1058 case NL80211_IFTYPE_MESH_POINT: 1059 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1060 break; 1061 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1062 break; 1063 default: 1064 WARN(1, "frame for unexpected interface type"); 1065 break; 1066 } 1067 1068 kfree_skb(skb); 1069 } 1070 1071 /* then other type-dependent work */ 1072 switch (sdata->vif.type) { 1073 case NL80211_IFTYPE_STATION: 1074 ieee80211_sta_work(sdata); 1075 break; 1076 case NL80211_IFTYPE_ADHOC: 1077 ieee80211_ibss_work(sdata); 1078 break; 1079 case NL80211_IFTYPE_MESH_POINT: 1080 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1081 break; 1082 ieee80211_mesh_work(sdata); 1083 break; 1084 default: 1085 break; 1086 } 1087 } 1088 1089 1090 /* 1091 * Helper function to initialise an interface to a specific type. 1092 */ 1093 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1094 enum nl80211_iftype type) 1095 { 1096 /* clear type-dependent union */ 1097 memset(&sdata->u, 0, sizeof(sdata->u)); 1098 1099 /* and set some type-dependent values */ 1100 sdata->vif.type = type; 1101 sdata->vif.p2p = false; 1102 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1103 sdata->wdev.iftype = type; 1104 1105 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1106 sdata->control_port_no_encrypt = false; 1107 1108 sdata->noack_map = 0; 1109 1110 /* only monitor differs */ 1111 sdata->dev->type = ARPHRD_ETHER; 1112 1113 skb_queue_head_init(&sdata->skb_queue); 1114 INIT_WORK(&sdata->work, ieee80211_iface_work); 1115 1116 switch (type) { 1117 case NL80211_IFTYPE_P2P_GO: 1118 type = NL80211_IFTYPE_AP; 1119 sdata->vif.type = type; 1120 sdata->vif.p2p = true; 1121 /* fall through */ 1122 case NL80211_IFTYPE_AP: 1123 skb_queue_head_init(&sdata->u.ap.ps_bc_buf); 1124 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1125 break; 1126 case NL80211_IFTYPE_P2P_CLIENT: 1127 type = NL80211_IFTYPE_STATION; 1128 sdata->vif.type = type; 1129 sdata->vif.p2p = true; 1130 /* fall through */ 1131 case NL80211_IFTYPE_STATION: 1132 ieee80211_sta_setup_sdata(sdata); 1133 break; 1134 case NL80211_IFTYPE_ADHOC: 1135 ieee80211_ibss_setup_sdata(sdata); 1136 break; 1137 case NL80211_IFTYPE_MESH_POINT: 1138 if (ieee80211_vif_is_mesh(&sdata->vif)) 1139 ieee80211_mesh_init_sdata(sdata); 1140 break; 1141 case NL80211_IFTYPE_MONITOR: 1142 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1143 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1144 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1145 MONITOR_FLAG_OTHER_BSS; 1146 break; 1147 case NL80211_IFTYPE_WDS: 1148 case NL80211_IFTYPE_AP_VLAN: 1149 break; 1150 case NL80211_IFTYPE_UNSPECIFIED: 1151 case NUM_NL80211_IFTYPES: 1152 BUG(); 1153 break; 1154 } 1155 1156 ieee80211_debugfs_add_netdev(sdata); 1157 } 1158 1159 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata) 1160 { 1161 switch (sdata->vif.type) { 1162 case NL80211_IFTYPE_MESH_POINT: 1163 mesh_path_flush_by_iface(sdata); 1164 break; 1165 1166 default: 1167 break; 1168 } 1169 } 1170 1171 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1172 enum nl80211_iftype type) 1173 { 1174 struct ieee80211_local *local = sdata->local; 1175 int ret, err; 1176 enum nl80211_iftype internal_type = type; 1177 bool p2p = false; 1178 1179 ASSERT_RTNL(); 1180 1181 if (!local->ops->change_interface) 1182 return -EBUSY; 1183 1184 switch (sdata->vif.type) { 1185 case NL80211_IFTYPE_AP: 1186 case NL80211_IFTYPE_STATION: 1187 case NL80211_IFTYPE_ADHOC: 1188 /* 1189 * Could maybe also all others here? 1190 * Just not sure how that interacts 1191 * with the RX/config path e.g. for 1192 * mesh. 1193 */ 1194 break; 1195 default: 1196 return -EBUSY; 1197 } 1198 1199 switch (type) { 1200 case NL80211_IFTYPE_AP: 1201 case NL80211_IFTYPE_STATION: 1202 case NL80211_IFTYPE_ADHOC: 1203 /* 1204 * Could probably support everything 1205 * but WDS here (WDS do_open can fail 1206 * under memory pressure, which this 1207 * code isn't prepared to handle). 1208 */ 1209 break; 1210 case NL80211_IFTYPE_P2P_CLIENT: 1211 p2p = true; 1212 internal_type = NL80211_IFTYPE_STATION; 1213 break; 1214 case NL80211_IFTYPE_P2P_GO: 1215 p2p = true; 1216 internal_type = NL80211_IFTYPE_AP; 1217 break; 1218 default: 1219 return -EBUSY; 1220 } 1221 1222 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1223 if (ret) 1224 return ret; 1225 1226 ieee80211_do_stop(sdata, false); 1227 1228 ieee80211_teardown_sdata(sdata->dev); 1229 1230 ret = drv_change_interface(local, sdata, internal_type, p2p); 1231 if (ret) 1232 type = sdata->vif.type; 1233 1234 /* 1235 * Ignore return value here, there's not much we can do since 1236 * the driver changed the interface type internally already. 1237 * The warnings will hopefully make driver authors fix it :-) 1238 */ 1239 ieee80211_check_queues(sdata); 1240 1241 ieee80211_setup_sdata(sdata, type); 1242 1243 err = ieee80211_do_open(sdata->dev, false); 1244 WARN(err, "type change: do_open returned %d", err); 1245 1246 return ret; 1247 } 1248 1249 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1250 enum nl80211_iftype type) 1251 { 1252 int ret; 1253 1254 ASSERT_RTNL(); 1255 1256 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1257 return 0; 1258 1259 /* Setting ad-hoc mode on non-IBSS channel is not supported. */ 1260 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && 1261 type == NL80211_IFTYPE_ADHOC) 1262 return -EOPNOTSUPP; 1263 1264 if (ieee80211_sdata_running(sdata)) { 1265 ret = ieee80211_runtime_change_iftype(sdata, type); 1266 if (ret) 1267 return ret; 1268 } else { 1269 /* Purge and reset type-dependent state. */ 1270 ieee80211_teardown_sdata(sdata->dev); 1271 ieee80211_setup_sdata(sdata, type); 1272 } 1273 1274 /* reset some values that shouldn't be kept across type changes */ 1275 sdata->vif.bss_conf.basic_rates = 1276 ieee80211_mandatory_rates(sdata->local, 1277 sdata->local->hw.conf.channel->band); 1278 sdata->drop_unencrypted = 0; 1279 if (type == NL80211_IFTYPE_STATION) 1280 sdata->u.mgd.use_4addr = false; 1281 1282 return 0; 1283 } 1284 1285 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1286 struct net_device *dev, 1287 enum nl80211_iftype type) 1288 { 1289 struct ieee80211_sub_if_data *sdata; 1290 u64 mask, start, addr, val, inc; 1291 u8 *m; 1292 u8 tmp_addr[ETH_ALEN]; 1293 int i; 1294 1295 /* default ... something at least */ 1296 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1297 1298 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1299 local->hw.wiphy->n_addresses <= 1) 1300 return; 1301 1302 1303 mutex_lock(&local->iflist_mtx); 1304 1305 switch (type) { 1306 case NL80211_IFTYPE_MONITOR: 1307 /* doesn't matter */ 1308 break; 1309 case NL80211_IFTYPE_WDS: 1310 case NL80211_IFTYPE_AP_VLAN: 1311 /* match up with an AP interface */ 1312 list_for_each_entry(sdata, &local->interfaces, list) { 1313 if (sdata->vif.type != NL80211_IFTYPE_AP) 1314 continue; 1315 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN); 1316 break; 1317 } 1318 /* keep default if no AP interface present */ 1319 break; 1320 default: 1321 /* assign a new address if possible -- try n_addresses first */ 1322 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1323 bool used = false; 1324 1325 list_for_each_entry(sdata, &local->interfaces, list) { 1326 if (memcmp(local->hw.wiphy->addresses[i].addr, 1327 sdata->vif.addr, ETH_ALEN) == 0) { 1328 used = true; 1329 break; 1330 } 1331 } 1332 1333 if (!used) { 1334 memcpy(dev->perm_addr, 1335 local->hw.wiphy->addresses[i].addr, 1336 ETH_ALEN); 1337 break; 1338 } 1339 } 1340 1341 /* try mask if available */ 1342 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1343 break; 1344 1345 m = local->hw.wiphy->addr_mask; 1346 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1347 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1348 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1349 1350 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1351 /* not a contiguous mask ... not handled now! */ 1352 pr_info("not contiguous\n"); 1353 break; 1354 } 1355 1356 m = local->hw.wiphy->perm_addr; 1357 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1358 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1359 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1360 1361 inc = 1ULL<<__ffs64(mask); 1362 val = (start & mask); 1363 addr = (start & ~mask) | (val & mask); 1364 do { 1365 bool used = false; 1366 1367 tmp_addr[5] = addr >> 0*8; 1368 tmp_addr[4] = addr >> 1*8; 1369 tmp_addr[3] = addr >> 2*8; 1370 tmp_addr[2] = addr >> 3*8; 1371 tmp_addr[1] = addr >> 4*8; 1372 tmp_addr[0] = addr >> 5*8; 1373 1374 val += inc; 1375 1376 list_for_each_entry(sdata, &local->interfaces, list) { 1377 if (memcmp(tmp_addr, sdata->vif.addr, 1378 ETH_ALEN) == 0) { 1379 used = true; 1380 break; 1381 } 1382 } 1383 1384 if (!used) { 1385 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN); 1386 break; 1387 } 1388 addr = (start & ~mask) | (val & mask); 1389 } while (addr != start); 1390 1391 break; 1392 } 1393 1394 mutex_unlock(&local->iflist_mtx); 1395 } 1396 1397 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1398 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1399 struct vif_params *params) 1400 { 1401 struct net_device *ndev; 1402 struct ieee80211_sub_if_data *sdata = NULL; 1403 int ret, i; 1404 int txqs = 1; 1405 1406 ASSERT_RTNL(); 1407 1408 if (local->hw.queues >= IEEE80211_NUM_ACS) 1409 txqs = IEEE80211_NUM_ACS; 1410 1411 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size, 1412 name, ieee80211_if_setup, txqs, 1); 1413 if (!ndev) 1414 return -ENOMEM; 1415 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1416 1417 ndev->needed_headroom = local->tx_headroom + 1418 4*6 /* four MAC addresses */ 1419 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1420 + 6 /* mesh */ 1421 + 8 /* rfc1042/bridge tunnel */ 1422 - ETH_HLEN /* ethernet hard_header_len */ 1423 + IEEE80211_ENCRYPT_HEADROOM; 1424 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1425 1426 ret = dev_alloc_name(ndev, ndev->name); 1427 if (ret < 0) 1428 goto fail; 1429 1430 ieee80211_assign_perm_addr(local, ndev, type); 1431 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1432 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1433 1434 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ 1435 sdata = netdev_priv(ndev); 1436 ndev->ieee80211_ptr = &sdata->wdev; 1437 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1438 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1439 1440 /* initialise type-independent data */ 1441 sdata->wdev.wiphy = local->hw.wiphy; 1442 sdata->local = local; 1443 sdata->dev = ndev; 1444 #ifdef CONFIG_INET 1445 sdata->arp_filter_state = true; 1446 #endif 1447 1448 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1449 skb_queue_head_init(&sdata->fragments[i].skb_list); 1450 1451 INIT_LIST_HEAD(&sdata->key_list); 1452 1453 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1454 struct ieee80211_supported_band *sband; 1455 sband = local->hw.wiphy->bands[i]; 1456 sdata->rc_rateidx_mask[i] = 1457 sband ? (1 << sband->n_bitrates) - 1 : 0; 1458 if (sband) 1459 memcpy(sdata->rc_rateidx_mcs_mask[i], 1460 sband->ht_cap.mcs.rx_mask, 1461 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1462 else 1463 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1464 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1465 } 1466 1467 ieee80211_set_default_queues(sdata); 1468 1469 /* setup type-dependent data */ 1470 ieee80211_setup_sdata(sdata, type); 1471 1472 if (params) { 1473 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1474 if (type == NL80211_IFTYPE_STATION) 1475 sdata->u.mgd.use_4addr = params->use_4addr; 1476 } 1477 1478 ndev->features |= local->hw.netdev_features; 1479 1480 ret = register_netdevice(ndev); 1481 if (ret) 1482 goto fail; 1483 1484 mutex_lock(&local->iflist_mtx); 1485 list_add_tail_rcu(&sdata->list, &local->interfaces); 1486 mutex_unlock(&local->iflist_mtx); 1487 1488 if (new_wdev) 1489 *new_wdev = &sdata->wdev; 1490 1491 return 0; 1492 1493 fail: 1494 free_netdev(ndev); 1495 return ret; 1496 } 1497 1498 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1499 { 1500 ASSERT_RTNL(); 1501 1502 mutex_lock(&sdata->local->iflist_mtx); 1503 list_del_rcu(&sdata->list); 1504 mutex_unlock(&sdata->local->iflist_mtx); 1505 1506 /* clean up type-dependent data */ 1507 ieee80211_clean_sdata(sdata); 1508 1509 synchronize_rcu(); 1510 unregister_netdevice(sdata->dev); 1511 } 1512 1513 /* 1514 * Remove all interfaces, may only be called at hardware unregistration 1515 * time because it doesn't do RCU-safe list removals. 1516 */ 1517 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1518 { 1519 struct ieee80211_sub_if_data *sdata, *tmp; 1520 LIST_HEAD(unreg_list); 1521 1522 ASSERT_RTNL(); 1523 1524 mutex_lock(&local->iflist_mtx); 1525 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1526 list_del(&sdata->list); 1527 1528 ieee80211_clean_sdata(sdata); 1529 1530 unregister_netdevice_queue(sdata->dev, &unreg_list); 1531 } 1532 mutex_unlock(&local->iflist_mtx); 1533 unregister_netdevice_many(&unreg_list); 1534 list_del(&unreg_list); 1535 } 1536 1537 static int netdev_notify(struct notifier_block *nb, 1538 unsigned long state, 1539 void *ndev) 1540 { 1541 struct net_device *dev = ndev; 1542 struct ieee80211_sub_if_data *sdata; 1543 1544 if (state != NETDEV_CHANGENAME) 1545 return 0; 1546 1547 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1548 return 0; 1549 1550 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1551 return 0; 1552 1553 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1554 1555 memcpy(sdata->name, dev->name, IFNAMSIZ); 1556 1557 ieee80211_debugfs_rename_netdev(sdata); 1558 return 0; 1559 } 1560 1561 static struct notifier_block mac80211_netdev_notifier = { 1562 .notifier_call = netdev_notify, 1563 }; 1564 1565 int ieee80211_iface_init(void) 1566 { 1567 return register_netdevice_notifier(&mac80211_netdev_notifier); 1568 } 1569 1570 void ieee80211_iface_exit(void) 1571 { 1572 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1573 } 1574