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/kernel.h> 14 #include <linux/if_arp.h> 15 #include <linux/netdevice.h> 16 #include <linux/rtnetlink.h> 17 #include <net/mac80211.h> 18 #include "ieee80211_i.h" 19 #include "sta_info.h" 20 #include "debugfs_netdev.h" 21 #include "mesh.h" 22 #include "led.h" 23 #include "driver-ops.h" 24 25 /** 26 * DOC: Interface list locking 27 * 28 * The interface list in each struct ieee80211_local is protected 29 * three-fold: 30 * 31 * (1) modifications may only be done under the RTNL 32 * (2) modifications and readers are protected against each other by 33 * the iflist_mtx. 34 * (3) modifications are done in an RCU manner so atomic readers 35 * can traverse the list in RCU-safe blocks. 36 * 37 * As a consequence, reads (traversals) of the list can be protected 38 * by either the RTNL, the iflist_mtx or RCU. 39 */ 40 41 42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 43 { 44 int meshhdrlen; 45 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 46 47 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0; 48 49 /* FIX: what would be proper limits for MTU? 50 * This interface uses 802.3 frames. */ 51 if (new_mtu < 256 || 52 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) { 53 return -EINVAL; 54 } 55 56 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 57 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); 58 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 59 dev->mtu = new_mtu; 60 return 0; 61 } 62 63 static inline int identical_mac_addr_allowed(int type1, int type2) 64 { 65 return type1 == NL80211_IFTYPE_MONITOR || 66 type2 == NL80211_IFTYPE_MONITOR || 67 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 68 (type1 == NL80211_IFTYPE_WDS && 69 (type2 == NL80211_IFTYPE_WDS || 70 type2 == NL80211_IFTYPE_AP)) || 71 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 72 (type1 == NL80211_IFTYPE_AP_VLAN && 73 (type2 == NL80211_IFTYPE_AP || 74 type2 == NL80211_IFTYPE_AP_VLAN)); 75 } 76 77 static int ieee80211_open(struct net_device *dev) 78 { 79 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 80 struct ieee80211_sub_if_data *nsdata; 81 struct ieee80211_local *local = sdata->local; 82 struct sta_info *sta; 83 struct ieee80211_if_init_conf conf; 84 u32 changed = 0; 85 int res; 86 u32 hw_reconf_flags = 0; 87 u8 null_addr[ETH_ALEN] = {0}; 88 89 /* fail early if user set an invalid address */ 90 if (compare_ether_addr(dev->dev_addr, null_addr) && 91 !is_valid_ether_addr(dev->dev_addr)) 92 return -EADDRNOTAVAIL; 93 94 /* we hold the RTNL here so can safely walk the list */ 95 list_for_each_entry(nsdata, &local->interfaces, list) { 96 struct net_device *ndev = nsdata->dev; 97 98 if (ndev != dev && netif_running(ndev)) { 99 /* 100 * Allow only a single IBSS interface to be up at any 101 * time. This is restricted because beacon distribution 102 * cannot work properly if both are in the same IBSS. 103 * 104 * To remove this restriction we'd have to disallow them 105 * from setting the same SSID on different IBSS interfaces 106 * belonging to the same hardware. Then, however, we're 107 * faced with having to adopt two different TSF timers... 108 */ 109 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 110 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 111 return -EBUSY; 112 113 /* 114 * The remaining checks are only performed for interfaces 115 * with the same MAC address. 116 */ 117 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr)) 118 continue; 119 120 /* 121 * check whether it may have the same address 122 */ 123 if (!identical_mac_addr_allowed(sdata->vif.type, 124 nsdata->vif.type)) 125 return -ENOTUNIQ; 126 127 /* 128 * can only add VLANs to enabled APs 129 */ 130 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 131 nsdata->vif.type == NL80211_IFTYPE_AP) 132 sdata->bss = &nsdata->u.ap; 133 } 134 } 135 136 switch (sdata->vif.type) { 137 case NL80211_IFTYPE_WDS: 138 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 139 return -ENOLINK; 140 break; 141 case NL80211_IFTYPE_AP_VLAN: 142 if (!sdata->bss) 143 return -ENOLINK; 144 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 145 break; 146 case NL80211_IFTYPE_AP: 147 sdata->bss = &sdata->u.ap; 148 break; 149 case NL80211_IFTYPE_MESH_POINT: 150 if (!ieee80211_vif_is_mesh(&sdata->vif)) 151 break; 152 /* mesh ifaces must set allmulti to forward mcast traffic */ 153 atomic_inc(&local->iff_allmultis); 154 break; 155 case NL80211_IFTYPE_STATION: 156 case NL80211_IFTYPE_MONITOR: 157 case NL80211_IFTYPE_ADHOC: 158 /* no special treatment */ 159 break; 160 case NL80211_IFTYPE_UNSPECIFIED: 161 case __NL80211_IFTYPE_AFTER_LAST: 162 /* cannot happen */ 163 WARN_ON(1); 164 break; 165 } 166 167 if (local->open_count == 0) { 168 res = drv_start(local); 169 if (res) 170 goto err_del_bss; 171 /* we're brought up, everything changes */ 172 hw_reconf_flags = ~0; 173 ieee80211_led_radio(local, true); 174 } 175 176 /* 177 * Check all interfaces and copy the hopefully now-present 178 * MAC address to those that have the special null one. 179 */ 180 list_for_each_entry(nsdata, &local->interfaces, list) { 181 struct net_device *ndev = nsdata->dev; 182 183 /* 184 * No need to check netif_running since we do not allow 185 * it to start up with this invalid address. 186 */ 187 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) 188 memcpy(ndev->dev_addr, 189 local->hw.wiphy->perm_addr, 190 ETH_ALEN); 191 } 192 193 if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0) 194 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, 195 ETH_ALEN); 196 197 /* 198 * Validate the MAC address for this device. 199 */ 200 if (!is_valid_ether_addr(dev->dev_addr)) { 201 if (!local->open_count) 202 drv_stop(local); 203 return -EADDRNOTAVAIL; 204 } 205 206 switch (sdata->vif.type) { 207 case NL80211_IFTYPE_AP_VLAN: 208 /* no need to tell driver */ 209 break; 210 case NL80211_IFTYPE_MONITOR: 211 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 212 local->cooked_mntrs++; 213 break; 214 } 215 216 /* must be before the call to ieee80211_configure_filter */ 217 local->monitors++; 218 if (local->monitors == 1) { 219 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP; 220 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP; 221 } 222 223 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) 224 local->fif_fcsfail++; 225 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) 226 local->fif_plcpfail++; 227 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) 228 local->fif_control++; 229 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) 230 local->fif_other_bss++; 231 232 netif_addr_lock_bh(local->mdev); 233 ieee80211_configure_filter(local); 234 netif_addr_unlock_bh(local->mdev); 235 break; 236 case NL80211_IFTYPE_STATION: 237 sdata->u.mgd.flags &= ~IEEE80211_STA_PREV_BSSID_SET; 238 /* fall through */ 239 default: 240 conf.vif = &sdata->vif; 241 conf.type = sdata->vif.type; 242 conf.mac_addr = dev->dev_addr; 243 res = drv_add_interface(local, &conf); 244 if (res) 245 goto err_stop; 246 247 if (ieee80211_vif_is_mesh(&sdata->vif)) { 248 local->fif_other_bss++; 249 netif_addr_lock_bh(local->mdev); 250 ieee80211_configure_filter(local); 251 netif_addr_unlock_bh(local->mdev); 252 253 ieee80211_start_mesh(sdata); 254 } 255 changed |= ieee80211_reset_erp_info(sdata); 256 ieee80211_bss_info_change_notify(sdata, changed); 257 ieee80211_enable_keys(sdata); 258 259 if (sdata->vif.type == NL80211_IFTYPE_STATION) 260 netif_carrier_off(dev); 261 else 262 netif_carrier_on(dev); 263 } 264 265 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 266 /* Create STA entry for the WDS peer */ 267 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 268 GFP_KERNEL); 269 if (!sta) { 270 res = -ENOMEM; 271 goto err_del_interface; 272 } 273 274 /* no locking required since STA is not live yet */ 275 sta->flags |= WLAN_STA_AUTHORIZED; 276 277 res = sta_info_insert(sta); 278 if (res) { 279 /* STA has been freed */ 280 goto err_del_interface; 281 } 282 } 283 284 if (local->open_count == 0) { 285 res = dev_open(local->mdev); 286 WARN_ON(res); 287 if (res) 288 goto err_del_interface; 289 tasklet_enable(&local->tx_pending_tasklet); 290 tasklet_enable(&local->tasklet); 291 } 292 293 /* 294 * set_multicast_list will be invoked by the networking core 295 * which will check whether any increments here were done in 296 * error and sync them down to the hardware as filter flags. 297 */ 298 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 299 atomic_inc(&local->iff_allmultis); 300 301 if (sdata->flags & IEEE80211_SDATA_PROMISC) 302 atomic_inc(&local->iff_promiscs); 303 304 hw_reconf_flags |= __ieee80211_recalc_idle(local); 305 306 local->open_count++; 307 if (hw_reconf_flags) { 308 ieee80211_hw_config(local, hw_reconf_flags); 309 /* 310 * set default queue parameters so drivers don't 311 * need to initialise the hardware if the hardware 312 * doesn't start up with sane defaults 313 */ 314 ieee80211_set_wmm_default(sdata); 315 } 316 317 ieee80211_recalc_ps(local, -1); 318 319 /* 320 * ieee80211_sta_work is disabled while network interface 321 * is down. Therefore, some configuration changes may not 322 * yet be effective. Trigger execution of ieee80211_sta_work 323 * to fix this. 324 */ 325 if (sdata->vif.type == NL80211_IFTYPE_STATION) 326 queue_work(local->hw.workqueue, &sdata->u.mgd.work); 327 328 netif_tx_start_all_queues(dev); 329 330 return 0; 331 err_del_interface: 332 drv_remove_interface(local, &conf); 333 err_stop: 334 if (!local->open_count) 335 drv_stop(local); 336 err_del_bss: 337 sdata->bss = NULL; 338 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 339 list_del(&sdata->u.vlan.list); 340 return res; 341 } 342 343 static int ieee80211_stop(struct net_device *dev) 344 { 345 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 346 struct ieee80211_local *local = sdata->local; 347 struct ieee80211_if_init_conf conf; 348 struct sta_info *sta; 349 u32 hw_reconf_flags = 0; 350 351 /* 352 * Stop TX on this interface first. 353 */ 354 netif_tx_stop_all_queues(dev); 355 356 /* 357 * Now delete all active aggregation sessions. 358 */ 359 rcu_read_lock(); 360 361 list_for_each_entry_rcu(sta, &local->sta_list, list) { 362 if (sta->sdata == sdata) 363 ieee80211_sta_tear_down_BA_sessions(sta); 364 } 365 366 rcu_read_unlock(); 367 368 /* 369 * Announce that we are leaving the network, in case we are a 370 * station interface type. This must be done before removing 371 * all stations associated with sta_info_flush, otherwise STA 372 * information will be gone and no announce being done. 373 */ 374 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 375 if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED) 376 ieee80211_sta_deauthenticate(sdata, 377 WLAN_REASON_DEAUTH_LEAVING); 378 } 379 380 /* 381 * Remove all stations associated with this interface. 382 * 383 * This must be done before calling ops->remove_interface() 384 * because otherwise we can later invoke ops->sta_notify() 385 * whenever the STAs are removed, and that invalidates driver 386 * assumptions about always getting a vif pointer that is valid 387 * (because if we remove a STA after ops->remove_interface() 388 * the driver will have removed the vif info already!) 389 * 390 * We could relax this and only unlink the stations from the 391 * hash table and list but keep them on a per-sdata list that 392 * will be inserted back again when the interface is brought 393 * up again, but I don't currently see a use case for that, 394 * except with WDS which gets a STA entry created when it is 395 * brought up. 396 */ 397 sta_info_flush(local, sdata); 398 399 /* 400 * Don't count this interface for promisc/allmulti while it 401 * is down. dev_mc_unsync() will invoke set_multicast_list 402 * on the master interface which will sync these down to the 403 * hardware as filter flags. 404 */ 405 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 406 atomic_dec(&local->iff_allmultis); 407 408 if (sdata->flags & IEEE80211_SDATA_PROMISC) 409 atomic_dec(&local->iff_promiscs); 410 411 dev_mc_unsync(local->mdev, dev); 412 del_timer_sync(&local->dynamic_ps_timer); 413 cancel_work_sync(&local->dynamic_ps_enable_work); 414 415 /* APs need special treatment */ 416 if (sdata->vif.type == NL80211_IFTYPE_AP) { 417 struct ieee80211_sub_if_data *vlan, *tmp; 418 struct beacon_data *old_beacon = sdata->u.ap.beacon; 419 420 /* remove beacon */ 421 rcu_assign_pointer(sdata->u.ap.beacon, NULL); 422 synchronize_rcu(); 423 kfree(old_beacon); 424 425 /* down all dependent devices, that is VLANs */ 426 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans, 427 u.vlan.list) 428 dev_close(vlan->dev); 429 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 430 } 431 432 local->open_count--; 433 434 switch (sdata->vif.type) { 435 case NL80211_IFTYPE_AP_VLAN: 436 list_del(&sdata->u.vlan.list); 437 /* no need to tell driver */ 438 break; 439 case NL80211_IFTYPE_MONITOR: 440 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 441 local->cooked_mntrs--; 442 break; 443 } 444 445 local->monitors--; 446 if (local->monitors == 0) { 447 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP; 448 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP; 449 } 450 451 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) 452 local->fif_fcsfail--; 453 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) 454 local->fif_plcpfail--; 455 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) 456 local->fif_control--; 457 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) 458 local->fif_other_bss--; 459 460 netif_addr_lock_bh(local->mdev); 461 ieee80211_configure_filter(local); 462 netif_addr_unlock_bh(local->mdev); 463 break; 464 case NL80211_IFTYPE_STATION: 465 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 466 del_timer_sync(&sdata->u.mgd.chswitch_timer); 467 del_timer_sync(&sdata->u.mgd.timer); 468 /* 469 * If the timer fired while we waited for it, it will have 470 * requeued the work. Now the work will be running again 471 * but will not rearm the timer again because it checks 472 * whether the interface is running, which, at this point, 473 * it no longer is. 474 */ 475 cancel_work_sync(&sdata->u.mgd.work); 476 cancel_work_sync(&sdata->u.mgd.chswitch_work); 477 478 cancel_work_sync(&sdata->u.mgd.beacon_loss_work); 479 480 /* 481 * When we get here, the interface is marked down. 482 * Call synchronize_rcu() to wait for the RX path 483 * should it be using the interface and enqueuing 484 * frames at this very time on another CPU. 485 */ 486 synchronize_rcu(); 487 skb_queue_purge(&sdata->u.mgd.skb_queue); 488 489 sdata->u.mgd.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED | 490 IEEE80211_STA_TKIP_WEP_USED); 491 kfree(sdata->u.mgd.extra_ie); 492 sdata->u.mgd.extra_ie = NULL; 493 sdata->u.mgd.extra_ie_len = 0; 494 /* fall through */ 495 case NL80211_IFTYPE_ADHOC: 496 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 497 del_timer_sync(&sdata->u.ibss.timer); 498 cancel_work_sync(&sdata->u.ibss.work); 499 synchronize_rcu(); 500 skb_queue_purge(&sdata->u.ibss.skb_queue); 501 } 502 /* fall through */ 503 case NL80211_IFTYPE_MESH_POINT: 504 if (ieee80211_vif_is_mesh(&sdata->vif)) { 505 /* other_bss and allmulti are always set on mesh 506 * ifaces */ 507 local->fif_other_bss--; 508 atomic_dec(&local->iff_allmultis); 509 510 netif_addr_lock_bh(local->mdev); 511 ieee80211_configure_filter(local); 512 netif_addr_unlock_bh(local->mdev); 513 514 ieee80211_stop_mesh(sdata); 515 } 516 /* fall through */ 517 default: 518 if (local->scan_sdata == sdata) { 519 if (!local->ops->hw_scan) 520 cancel_delayed_work_sync(&local->scan_work); 521 /* 522 * The software scan can no longer run now, so we can 523 * clear out the scan_sdata reference. However, the 524 * hardware scan may still be running. The complete 525 * function must be prepared to handle a NULL value. 526 */ 527 local->scan_sdata = NULL; 528 /* 529 * The memory barrier guarantees that another CPU 530 * that is hardware-scanning will now see the fact 531 * that this interface is gone. 532 */ 533 smp_mb(); 534 /* 535 * If software scanning, complete the scan but since 536 * the scan_sdata is NULL already don't send out a 537 * scan event to userspace -- the scan is incomplete. 538 */ 539 if (local->sw_scanning) 540 ieee80211_scan_completed(&local->hw, true); 541 } 542 543 conf.vif = &sdata->vif; 544 conf.type = sdata->vif.type; 545 conf.mac_addr = dev->dev_addr; 546 /* disable all keys for as long as this netdev is down */ 547 ieee80211_disable_keys(sdata); 548 drv_remove_interface(local, &conf); 549 } 550 551 sdata->bss = NULL; 552 553 hw_reconf_flags |= __ieee80211_recalc_idle(local); 554 555 ieee80211_recalc_ps(local, -1); 556 557 if (local->open_count == 0) { 558 if (netif_running(local->mdev)) 559 dev_close(local->mdev); 560 561 drv_stop(local); 562 563 ieee80211_led_radio(local, false); 564 565 flush_workqueue(local->hw.workqueue); 566 567 tasklet_disable(&local->tx_pending_tasklet); 568 tasklet_disable(&local->tasklet); 569 570 /* no reconfiguring after stop! */ 571 hw_reconf_flags = 0; 572 } 573 574 /* do after stop to avoid reconfiguring when we stop anyway */ 575 if (hw_reconf_flags) 576 ieee80211_hw_config(local, hw_reconf_flags); 577 578 return 0; 579 } 580 581 static void ieee80211_set_multicast_list(struct net_device *dev) 582 { 583 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 584 struct ieee80211_local *local = sdata->local; 585 int allmulti, promisc, sdata_allmulti, sdata_promisc; 586 587 allmulti = !!(dev->flags & IFF_ALLMULTI); 588 promisc = !!(dev->flags & IFF_PROMISC); 589 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 590 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 591 592 if (allmulti != sdata_allmulti) { 593 if (dev->flags & IFF_ALLMULTI) 594 atomic_inc(&local->iff_allmultis); 595 else 596 atomic_dec(&local->iff_allmultis); 597 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 598 } 599 600 if (promisc != sdata_promisc) { 601 if (dev->flags & IFF_PROMISC) 602 atomic_inc(&local->iff_promiscs); 603 else 604 atomic_dec(&local->iff_promiscs); 605 sdata->flags ^= IEEE80211_SDATA_PROMISC; 606 } 607 608 dev_mc_sync(local->mdev, dev); 609 } 610 611 /* 612 * Called when the netdev is removed or, by the code below, before 613 * the interface type changes. 614 */ 615 static void ieee80211_teardown_sdata(struct net_device *dev) 616 { 617 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 618 struct ieee80211_local *local = sdata->local; 619 struct beacon_data *beacon; 620 struct sk_buff *skb; 621 int flushed; 622 int i; 623 624 /* free extra data */ 625 ieee80211_free_keys(sdata); 626 627 ieee80211_debugfs_remove_netdev(sdata); 628 629 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 630 __skb_queue_purge(&sdata->fragments[i].skb_list); 631 sdata->fragment_next = 0; 632 633 switch (sdata->vif.type) { 634 case NL80211_IFTYPE_AP: 635 beacon = sdata->u.ap.beacon; 636 rcu_assign_pointer(sdata->u.ap.beacon, NULL); 637 synchronize_rcu(); 638 kfree(beacon); 639 640 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) { 641 local->total_ps_buffered--; 642 dev_kfree_skb(skb); 643 } 644 645 break; 646 case NL80211_IFTYPE_MESH_POINT: 647 if (ieee80211_vif_is_mesh(&sdata->vif)) 648 mesh_rmc_free(sdata); 649 break; 650 case NL80211_IFTYPE_ADHOC: 651 if (WARN_ON(sdata->u.ibss.presp)) 652 kfree_skb(sdata->u.ibss.presp); 653 break; 654 case NL80211_IFTYPE_STATION: 655 kfree(sdata->u.mgd.extra_ie); 656 kfree(sdata->u.mgd.assocreq_ies); 657 kfree(sdata->u.mgd.assocresp_ies); 658 kfree(sdata->u.mgd.sme_auth_ie); 659 break; 660 case NL80211_IFTYPE_WDS: 661 case NL80211_IFTYPE_AP_VLAN: 662 case NL80211_IFTYPE_MONITOR: 663 break; 664 case NL80211_IFTYPE_UNSPECIFIED: 665 case __NL80211_IFTYPE_AFTER_LAST: 666 BUG(); 667 break; 668 } 669 670 flushed = sta_info_flush(local, sdata); 671 WARN_ON(flushed); 672 } 673 674 static const struct net_device_ops ieee80211_dataif_ops = { 675 .ndo_open = ieee80211_open, 676 .ndo_stop = ieee80211_stop, 677 .ndo_uninit = ieee80211_teardown_sdata, 678 .ndo_start_xmit = ieee80211_subif_start_xmit, 679 .ndo_set_multicast_list = ieee80211_set_multicast_list, 680 .ndo_change_mtu = ieee80211_change_mtu, 681 .ndo_set_mac_address = eth_mac_addr, 682 }; 683 684 static const struct net_device_ops ieee80211_monitorif_ops = { 685 .ndo_open = ieee80211_open, 686 .ndo_stop = ieee80211_stop, 687 .ndo_uninit = ieee80211_teardown_sdata, 688 .ndo_start_xmit = ieee80211_monitor_start_xmit, 689 .ndo_set_multicast_list = ieee80211_set_multicast_list, 690 .ndo_change_mtu = ieee80211_change_mtu, 691 .ndo_set_mac_address = eth_mac_addr, 692 }; 693 694 static void ieee80211_if_setup(struct net_device *dev) 695 { 696 ether_setup(dev); 697 dev->netdev_ops = &ieee80211_dataif_ops; 698 dev->wireless_handlers = &ieee80211_iw_handler_def; 699 dev->destructor = free_netdev; 700 } 701 702 /* 703 * Helper function to initialise an interface to a specific type. 704 */ 705 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 706 enum nl80211_iftype type) 707 { 708 /* clear type-dependent union */ 709 memset(&sdata->u, 0, sizeof(sdata->u)); 710 711 /* and set some type-dependent values */ 712 sdata->vif.type = type; 713 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 714 sdata->wdev.iftype = type; 715 716 /* only monitor differs */ 717 sdata->dev->type = ARPHRD_ETHER; 718 719 switch (type) { 720 case NL80211_IFTYPE_AP: 721 skb_queue_head_init(&sdata->u.ap.ps_bc_buf); 722 INIT_LIST_HEAD(&sdata->u.ap.vlans); 723 break; 724 case NL80211_IFTYPE_STATION: 725 ieee80211_sta_setup_sdata(sdata); 726 break; 727 case NL80211_IFTYPE_ADHOC: 728 ieee80211_ibss_setup_sdata(sdata); 729 break; 730 case NL80211_IFTYPE_MESH_POINT: 731 if (ieee80211_vif_is_mesh(&sdata->vif)) 732 ieee80211_mesh_init_sdata(sdata); 733 break; 734 case NL80211_IFTYPE_MONITOR: 735 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 736 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 737 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 738 MONITOR_FLAG_OTHER_BSS; 739 break; 740 case NL80211_IFTYPE_WDS: 741 case NL80211_IFTYPE_AP_VLAN: 742 break; 743 case NL80211_IFTYPE_UNSPECIFIED: 744 case __NL80211_IFTYPE_AFTER_LAST: 745 BUG(); 746 break; 747 } 748 749 ieee80211_debugfs_add_netdev(sdata); 750 } 751 752 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 753 enum nl80211_iftype type) 754 { 755 ASSERT_RTNL(); 756 757 if (type == sdata->vif.type) 758 return 0; 759 760 /* Setting ad-hoc mode on non-IBSS channel is not supported. */ 761 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && 762 type == NL80211_IFTYPE_ADHOC) 763 return -EOPNOTSUPP; 764 765 /* 766 * We could, here, on changes between IBSS/STA/MESH modes, 767 * invoke an MLME function instead that disassociates etc. 768 * and goes into the requested mode. 769 */ 770 771 if (netif_running(sdata->dev)) 772 return -EBUSY; 773 774 /* Purge and reset type-dependent state. */ 775 ieee80211_teardown_sdata(sdata->dev); 776 ieee80211_setup_sdata(sdata, type); 777 778 /* reset some values that shouldn't be kept across type changes */ 779 sdata->vif.bss_conf.basic_rates = 780 ieee80211_mandatory_rates(sdata->local, 781 sdata->local->hw.conf.channel->band); 782 sdata->drop_unencrypted = 0; 783 784 return 0; 785 } 786 787 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 788 struct net_device **new_dev, enum nl80211_iftype type, 789 struct vif_params *params) 790 { 791 struct net_device *ndev; 792 struct ieee80211_sub_if_data *sdata = NULL; 793 int ret, i; 794 795 ASSERT_RTNL(); 796 797 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, 798 name, ieee80211_if_setup); 799 if (!ndev) 800 return -ENOMEM; 801 802 ndev->needed_headroom = local->tx_headroom + 803 4*6 /* four MAC addresses */ 804 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 805 + 6 /* mesh */ 806 + 8 /* rfc1042/bridge tunnel */ 807 - ETH_HLEN /* ethernet hard_header_len */ 808 + IEEE80211_ENCRYPT_HEADROOM; 809 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 810 811 ret = dev_alloc_name(ndev, ndev->name); 812 if (ret < 0) 813 goto fail; 814 815 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 816 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 817 ndev->features |= NETIF_F_NETNS_LOCAL; 818 819 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ 820 sdata = netdev_priv(ndev); 821 ndev->ieee80211_ptr = &sdata->wdev; 822 823 /* initialise type-independent data */ 824 sdata->wdev.wiphy = local->hw.wiphy; 825 sdata->local = local; 826 sdata->dev = ndev; 827 828 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 829 skb_queue_head_init(&sdata->fragments[i].skb_list); 830 831 INIT_LIST_HEAD(&sdata->key_list); 832 833 sdata->force_unicast_rateidx = -1; 834 sdata->max_ratectrl_rateidx = -1; 835 836 /* setup type-dependent data */ 837 ieee80211_setup_sdata(sdata, type); 838 839 ret = register_netdevice(ndev); 840 if (ret) 841 goto fail; 842 843 if (ieee80211_vif_is_mesh(&sdata->vif) && 844 params && params->mesh_id_len) 845 ieee80211_sdata_set_mesh_id(sdata, 846 params->mesh_id_len, 847 params->mesh_id); 848 849 mutex_lock(&local->iflist_mtx); 850 list_add_tail_rcu(&sdata->list, &local->interfaces); 851 mutex_unlock(&local->iflist_mtx); 852 853 if (new_dev) 854 *new_dev = ndev; 855 856 return 0; 857 858 fail: 859 free_netdev(ndev); 860 return ret; 861 } 862 863 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 864 { 865 ASSERT_RTNL(); 866 867 mutex_lock(&sdata->local->iflist_mtx); 868 list_del_rcu(&sdata->list); 869 mutex_unlock(&sdata->local->iflist_mtx); 870 871 synchronize_rcu(); 872 unregister_netdevice(sdata->dev); 873 } 874 875 /* 876 * Remove all interfaces, may only be called at hardware unregistration 877 * time because it doesn't do RCU-safe list removals. 878 */ 879 void ieee80211_remove_interfaces(struct ieee80211_local *local) 880 { 881 struct ieee80211_sub_if_data *sdata, *tmp; 882 883 ASSERT_RTNL(); 884 885 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 886 /* 887 * we cannot hold the iflist_mtx across unregister_netdevice, 888 * but we only need to hold it for list modifications to lock 889 * out readers since we're under the RTNL here as all other 890 * writers. 891 */ 892 mutex_lock(&local->iflist_mtx); 893 list_del(&sdata->list); 894 mutex_unlock(&local->iflist_mtx); 895 896 unregister_netdevice(sdata->dev); 897 } 898 } 899 900 static u32 ieee80211_idle_off(struct ieee80211_local *local, 901 const char *reason) 902 { 903 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 904 return 0; 905 906 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 907 printk(KERN_DEBUG "%s: device no longer idle - %s\n", 908 wiphy_name(local->hw.wiphy), reason); 909 #endif 910 911 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 912 return IEEE80211_CONF_CHANGE_IDLE; 913 } 914 915 static u32 ieee80211_idle_on(struct ieee80211_local *local) 916 { 917 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 918 return 0; 919 920 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 921 printk(KERN_DEBUG "%s: device now idle\n", 922 wiphy_name(local->hw.wiphy)); 923 #endif 924 925 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 926 return IEEE80211_CONF_CHANGE_IDLE; 927 } 928 929 u32 __ieee80211_recalc_idle(struct ieee80211_local *local) 930 { 931 struct ieee80211_sub_if_data *sdata; 932 int count = 0; 933 934 if (local->hw_scanning || local->sw_scanning) 935 return ieee80211_idle_off(local, "scanning"); 936 937 list_for_each_entry(sdata, &local->interfaces, list) { 938 if (!netif_running(sdata->dev)) 939 continue; 940 /* do not count disabled managed interfaces */ 941 if (sdata->vif.type == NL80211_IFTYPE_STATION && 942 sdata->u.mgd.state == IEEE80211_STA_MLME_DISABLED) 943 continue; 944 /* do not count unused IBSS interfaces */ 945 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 946 !sdata->u.ibss.ssid_len) 947 continue; 948 /* count everything else */ 949 count++; 950 } 951 952 if (!count) 953 return ieee80211_idle_on(local); 954 else 955 return ieee80211_idle_off(local, "in use"); 956 957 return 0; 958 } 959 960 void ieee80211_recalc_idle(struct ieee80211_local *local) 961 { 962 u32 chg; 963 964 mutex_lock(&local->iflist_mtx); 965 chg = __ieee80211_recalc_idle(local); 966 mutex_unlock(&local->iflist_mtx); 967 if (chg) 968 ieee80211_hw_config(local, chg); 969 } 970