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 24 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 25 { 26 int meshhdrlen; 27 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 28 29 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0; 30 31 /* FIX: what would be proper limits for MTU? 32 * This interface uses 802.3 frames. */ 33 if (new_mtu < 256 || 34 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) { 35 return -EINVAL; 36 } 37 38 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 39 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); 40 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 41 dev->mtu = new_mtu; 42 return 0; 43 } 44 45 static inline int identical_mac_addr_allowed(int type1, int type2) 46 { 47 return type1 == NL80211_IFTYPE_MONITOR || 48 type2 == NL80211_IFTYPE_MONITOR || 49 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 50 (type1 == NL80211_IFTYPE_WDS && 51 (type2 == NL80211_IFTYPE_WDS || 52 type2 == NL80211_IFTYPE_AP)) || 53 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 54 (type1 == NL80211_IFTYPE_AP_VLAN && 55 (type2 == NL80211_IFTYPE_AP || 56 type2 == NL80211_IFTYPE_AP_VLAN)); 57 } 58 59 static int ieee80211_open(struct net_device *dev) 60 { 61 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 62 struct ieee80211_sub_if_data *nsdata; 63 struct ieee80211_local *local = sdata->local; 64 struct sta_info *sta; 65 struct ieee80211_if_init_conf conf; 66 u32 changed = 0; 67 int res; 68 u32 hw_reconf_flags = 0; 69 u8 null_addr[ETH_ALEN] = {0}; 70 71 /* fail early if user set an invalid address */ 72 if (compare_ether_addr(dev->dev_addr, null_addr) && 73 !is_valid_ether_addr(dev->dev_addr)) 74 return -EADDRNOTAVAIL; 75 76 /* we hold the RTNL here so can safely walk the list */ 77 list_for_each_entry(nsdata, &local->interfaces, list) { 78 struct net_device *ndev = nsdata->dev; 79 80 if (ndev != dev && netif_running(ndev)) { 81 /* 82 * Allow only a single IBSS interface to be up at any 83 * time. This is restricted because beacon distribution 84 * cannot work properly if both are in the same IBSS. 85 * 86 * To remove this restriction we'd have to disallow them 87 * from setting the same SSID on different IBSS interfaces 88 * belonging to the same hardware. Then, however, we're 89 * faced with having to adopt two different TSF timers... 90 */ 91 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 92 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 93 return -EBUSY; 94 95 /* 96 * The remaining checks are only performed for interfaces 97 * with the same MAC address. 98 */ 99 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr)) 100 continue; 101 102 /* 103 * check whether it may have the same address 104 */ 105 if (!identical_mac_addr_allowed(sdata->vif.type, 106 nsdata->vif.type)) 107 return -ENOTUNIQ; 108 109 /* 110 * can only add VLANs to enabled APs 111 */ 112 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 113 nsdata->vif.type == NL80211_IFTYPE_AP) 114 sdata->bss = &nsdata->u.ap; 115 } 116 } 117 118 switch (sdata->vif.type) { 119 case NL80211_IFTYPE_WDS: 120 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 121 return -ENOLINK; 122 break; 123 case NL80211_IFTYPE_AP_VLAN: 124 if (!sdata->bss) 125 return -ENOLINK; 126 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 127 break; 128 case NL80211_IFTYPE_AP: 129 sdata->bss = &sdata->u.ap; 130 break; 131 case NL80211_IFTYPE_MESH_POINT: 132 if (!ieee80211_vif_is_mesh(&sdata->vif)) 133 break; 134 /* mesh ifaces must set allmulti to forward mcast traffic */ 135 atomic_inc(&local->iff_allmultis); 136 break; 137 case NL80211_IFTYPE_STATION: 138 case NL80211_IFTYPE_MONITOR: 139 case NL80211_IFTYPE_ADHOC: 140 /* no special treatment */ 141 break; 142 case NL80211_IFTYPE_UNSPECIFIED: 143 case __NL80211_IFTYPE_AFTER_LAST: 144 /* cannot happen */ 145 WARN_ON(1); 146 break; 147 } 148 149 if (local->open_count == 0) { 150 res = 0; 151 if (local->ops->start) 152 res = local->ops->start(local_to_hw(local)); 153 if (res) 154 goto err_del_bss; 155 /* we're brought up, everything changes */ 156 hw_reconf_flags = ~0; 157 ieee80211_led_radio(local, local->hw.conf.radio_enabled); 158 } 159 160 /* 161 * Check all interfaces and copy the hopefully now-present 162 * MAC address to those that have the special null one. 163 */ 164 list_for_each_entry(nsdata, &local->interfaces, list) { 165 struct net_device *ndev = nsdata->dev; 166 167 /* 168 * No need to check netif_running since we do not allow 169 * it to start up with this invalid address. 170 */ 171 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) 172 memcpy(ndev->dev_addr, 173 local->hw.wiphy->perm_addr, 174 ETH_ALEN); 175 } 176 177 if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0) 178 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, 179 ETH_ALEN); 180 181 /* 182 * Validate the MAC address for this device. 183 */ 184 if (!is_valid_ether_addr(dev->dev_addr)) { 185 if (!local->open_count && local->ops->stop) 186 local->ops->stop(local_to_hw(local)); 187 return -EADDRNOTAVAIL; 188 } 189 190 switch (sdata->vif.type) { 191 case NL80211_IFTYPE_AP_VLAN: 192 /* no need to tell driver */ 193 break; 194 case NL80211_IFTYPE_MONITOR: 195 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 196 local->cooked_mntrs++; 197 break; 198 } 199 200 /* must be before the call to ieee80211_configure_filter */ 201 local->monitors++; 202 if (local->monitors == 1) { 203 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP; 204 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP; 205 } 206 207 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) 208 local->fif_fcsfail++; 209 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) 210 local->fif_plcpfail++; 211 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) 212 local->fif_control++; 213 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) 214 local->fif_other_bss++; 215 216 netif_addr_lock_bh(local->mdev); 217 ieee80211_configure_filter(local); 218 netif_addr_unlock_bh(local->mdev); 219 break; 220 case NL80211_IFTYPE_STATION: 221 case NL80211_IFTYPE_ADHOC: 222 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET; 223 /* fall through */ 224 default: 225 conf.vif = &sdata->vif; 226 conf.type = sdata->vif.type; 227 conf.mac_addr = dev->dev_addr; 228 res = local->ops->add_interface(local_to_hw(local), &conf); 229 if (res) 230 goto err_stop; 231 232 if (ieee80211_vif_is_mesh(&sdata->vif)) { 233 local->fif_other_bss++; 234 netif_addr_lock_bh(local->mdev); 235 ieee80211_configure_filter(local); 236 netif_addr_unlock_bh(local->mdev); 237 238 ieee80211_start_mesh(sdata); 239 } 240 changed |= ieee80211_reset_erp_info(sdata); 241 ieee80211_bss_info_change_notify(sdata, changed); 242 ieee80211_enable_keys(sdata); 243 244 if (sdata->vif.type == NL80211_IFTYPE_STATION && 245 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) 246 netif_carrier_off(dev); 247 else 248 netif_carrier_on(dev); 249 } 250 251 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 252 /* Create STA entry for the WDS peer */ 253 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 254 GFP_KERNEL); 255 if (!sta) { 256 res = -ENOMEM; 257 goto err_del_interface; 258 } 259 260 /* no locking required since STA is not live yet */ 261 sta->flags |= WLAN_STA_AUTHORIZED; 262 263 res = sta_info_insert(sta); 264 if (res) { 265 /* STA has been freed */ 266 goto err_del_interface; 267 } 268 } 269 270 if (local->open_count == 0) { 271 res = dev_open(local->mdev); 272 WARN_ON(res); 273 if (res) 274 goto err_del_interface; 275 tasklet_enable(&local->tx_pending_tasklet); 276 tasklet_enable(&local->tasklet); 277 } 278 279 /* 280 * set_multicast_list will be invoked by the networking core 281 * which will check whether any increments here were done in 282 * error and sync them down to the hardware as filter flags. 283 */ 284 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 285 atomic_inc(&local->iff_allmultis); 286 287 if (sdata->flags & IEEE80211_SDATA_PROMISC) 288 atomic_inc(&local->iff_promiscs); 289 290 local->open_count++; 291 if (hw_reconf_flags) { 292 ieee80211_hw_config(local, hw_reconf_flags); 293 /* 294 * set default queue parameters so drivers don't 295 * need to initialise the hardware if the hardware 296 * doesn't start up with sane defaults 297 */ 298 ieee80211_set_wmm_default(sdata); 299 } 300 301 /* 302 * ieee80211_sta_work is disabled while network interface 303 * is down. Therefore, some configuration changes may not 304 * yet be effective. Trigger execution of ieee80211_sta_work 305 * to fix this. 306 */ 307 if (sdata->vif.type == NL80211_IFTYPE_STATION || 308 sdata->vif.type == NL80211_IFTYPE_ADHOC) { 309 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 310 queue_work(local->hw.workqueue, &ifsta->work); 311 } 312 313 netif_tx_start_all_queues(dev); 314 315 return 0; 316 err_del_interface: 317 local->ops->remove_interface(local_to_hw(local), &conf); 318 err_stop: 319 if (!local->open_count && local->ops->stop) 320 local->ops->stop(local_to_hw(local)); 321 err_del_bss: 322 sdata->bss = NULL; 323 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 324 list_del(&sdata->u.vlan.list); 325 return res; 326 } 327 328 static int ieee80211_stop(struct net_device *dev) 329 { 330 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 331 struct ieee80211_local *local = sdata->local; 332 struct ieee80211_if_init_conf conf; 333 struct sta_info *sta; 334 u32 hw_reconf_flags = 0; 335 336 /* 337 * Stop TX on this interface first. 338 */ 339 netif_tx_stop_all_queues(dev); 340 341 /* 342 * Now delete all active aggregation sessions. 343 */ 344 rcu_read_lock(); 345 346 list_for_each_entry_rcu(sta, &local->sta_list, list) { 347 if (sta->sdata == sdata) 348 ieee80211_sta_tear_down_BA_sessions(sdata, 349 sta->sta.addr); 350 } 351 352 rcu_read_unlock(); 353 354 /* 355 * Remove all stations associated with this interface. 356 * 357 * This must be done before calling ops->remove_interface() 358 * because otherwise we can later invoke ops->sta_notify() 359 * whenever the STAs are removed, and that invalidates driver 360 * assumptions about always getting a vif pointer that is valid 361 * (because if we remove a STA after ops->remove_interface() 362 * the driver will have removed the vif info already!) 363 * 364 * We could relax this and only unlink the stations from the 365 * hash table and list but keep them on a per-sdata list that 366 * will be inserted back again when the interface is brought 367 * up again, but I don't currently see a use case for that, 368 * except with WDS which gets a STA entry created when it is 369 * brought up. 370 */ 371 sta_info_flush(local, sdata); 372 373 /* 374 * Don't count this interface for promisc/allmulti while it 375 * is down. dev_mc_unsync() will invoke set_multicast_list 376 * on the master interface which will sync these down to the 377 * hardware as filter flags. 378 */ 379 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 380 atomic_dec(&local->iff_allmultis); 381 382 if (sdata->flags & IEEE80211_SDATA_PROMISC) 383 atomic_dec(&local->iff_promiscs); 384 385 dev_mc_unsync(local->mdev, dev); 386 387 /* APs need special treatment */ 388 if (sdata->vif.type == NL80211_IFTYPE_AP) { 389 struct ieee80211_sub_if_data *vlan, *tmp; 390 struct beacon_data *old_beacon = sdata->u.ap.beacon; 391 392 /* remove beacon */ 393 rcu_assign_pointer(sdata->u.ap.beacon, NULL); 394 synchronize_rcu(); 395 kfree(old_beacon); 396 397 /* down all dependent devices, that is VLANs */ 398 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans, 399 u.vlan.list) 400 dev_close(vlan->dev); 401 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 402 } 403 404 local->open_count--; 405 406 switch (sdata->vif.type) { 407 case NL80211_IFTYPE_AP_VLAN: 408 list_del(&sdata->u.vlan.list); 409 /* no need to tell driver */ 410 break; 411 case NL80211_IFTYPE_MONITOR: 412 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 413 local->cooked_mntrs--; 414 break; 415 } 416 417 local->monitors--; 418 if (local->monitors == 0) { 419 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP; 420 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP; 421 } 422 423 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) 424 local->fif_fcsfail--; 425 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) 426 local->fif_plcpfail--; 427 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) 428 local->fif_control--; 429 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) 430 local->fif_other_bss--; 431 432 netif_addr_lock_bh(local->mdev); 433 ieee80211_configure_filter(local); 434 netif_addr_unlock_bh(local->mdev); 435 break; 436 case NL80211_IFTYPE_STATION: 437 case NL80211_IFTYPE_ADHOC: 438 /* Announce that we are leaving the network. */ 439 if (sdata->u.sta.state != IEEE80211_STA_MLME_DISABLED) 440 ieee80211_sta_deauthenticate(sdata, 441 WLAN_REASON_DEAUTH_LEAVING); 442 443 memset(sdata->u.sta.bssid, 0, ETH_ALEN); 444 del_timer_sync(&sdata->u.sta.timer); 445 /* 446 * If the timer fired while we waited for it, it will have 447 * requeued the work. Now the work will be running again 448 * but will not rearm the timer again because it checks 449 * whether the interface is running, which, at this point, 450 * it no longer is. 451 */ 452 cancel_work_sync(&sdata->u.sta.work); 453 /* 454 * When we get here, the interface is marked down. 455 * Call synchronize_rcu() to wait for the RX path 456 * should it be using the interface and enqueuing 457 * frames at this very time on another CPU. 458 */ 459 synchronize_rcu(); 460 skb_queue_purge(&sdata->u.sta.skb_queue); 461 462 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED; 463 kfree(sdata->u.sta.extra_ie); 464 sdata->u.sta.extra_ie = NULL; 465 sdata->u.sta.extra_ie_len = 0; 466 /* fall through */ 467 case NL80211_IFTYPE_MESH_POINT: 468 if (ieee80211_vif_is_mesh(&sdata->vif)) { 469 /* other_bss and allmulti are always set on mesh 470 * ifaces */ 471 local->fif_other_bss--; 472 atomic_dec(&local->iff_allmultis); 473 474 netif_addr_lock_bh(local->mdev); 475 ieee80211_configure_filter(local); 476 netif_addr_unlock_bh(local->mdev); 477 478 ieee80211_stop_mesh(sdata); 479 } 480 /* fall through */ 481 default: 482 if (local->scan_sdata == sdata) { 483 if (!local->ops->hw_scan) 484 cancel_delayed_work_sync(&local->scan_work); 485 /* 486 * The software scan can no longer run now, so we can 487 * clear out the scan_sdata reference. However, the 488 * hardware scan may still be running. The complete 489 * function must be prepared to handle a NULL value. 490 */ 491 local->scan_sdata = NULL; 492 /* 493 * The memory barrier guarantees that another CPU 494 * that is hardware-scanning will now see the fact 495 * that this interface is gone. 496 */ 497 smp_mb(); 498 /* 499 * If software scanning, complete the scan but since 500 * the scan_sdata is NULL already don't send out a 501 * scan event to userspace -- the scan is incomplete. 502 */ 503 if (local->sw_scanning) 504 ieee80211_scan_completed(&local->hw); 505 } 506 507 conf.vif = &sdata->vif; 508 conf.type = sdata->vif.type; 509 conf.mac_addr = dev->dev_addr; 510 /* disable all keys for as long as this netdev is down */ 511 ieee80211_disable_keys(sdata); 512 local->ops->remove_interface(local_to_hw(local), &conf); 513 } 514 515 sdata->bss = NULL; 516 517 if (local->open_count == 0) { 518 if (netif_running(local->mdev)) 519 dev_close(local->mdev); 520 521 if (local->ops->stop) 522 local->ops->stop(local_to_hw(local)); 523 524 ieee80211_led_radio(local, 0); 525 526 flush_workqueue(local->hw.workqueue); 527 528 tasklet_disable(&local->tx_pending_tasklet); 529 tasklet_disable(&local->tasklet); 530 531 /* no reconfiguring after stop! */ 532 hw_reconf_flags = 0; 533 } 534 535 /* do after stop to avoid reconfiguring when we stop anyway */ 536 if (hw_reconf_flags) 537 ieee80211_hw_config(local, hw_reconf_flags); 538 539 return 0; 540 } 541 542 static void ieee80211_set_multicast_list(struct net_device *dev) 543 { 544 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 545 struct ieee80211_local *local = sdata->local; 546 int allmulti, promisc, sdata_allmulti, sdata_promisc; 547 548 allmulti = !!(dev->flags & IFF_ALLMULTI); 549 promisc = !!(dev->flags & IFF_PROMISC); 550 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 551 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 552 553 if (allmulti != sdata_allmulti) { 554 if (dev->flags & IFF_ALLMULTI) 555 atomic_inc(&local->iff_allmultis); 556 else 557 atomic_dec(&local->iff_allmultis); 558 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 559 } 560 561 if (promisc != sdata_promisc) { 562 if (dev->flags & IFF_PROMISC) 563 atomic_inc(&local->iff_promiscs); 564 else 565 atomic_dec(&local->iff_promiscs); 566 sdata->flags ^= IEEE80211_SDATA_PROMISC; 567 } 568 569 dev_mc_sync(local->mdev, dev); 570 } 571 572 static void ieee80211_if_setup(struct net_device *dev) 573 { 574 ether_setup(dev); 575 dev->hard_start_xmit = ieee80211_subif_start_xmit; 576 dev->wireless_handlers = &ieee80211_iw_handler_def; 577 dev->set_multicast_list = ieee80211_set_multicast_list; 578 dev->change_mtu = ieee80211_change_mtu; 579 dev->open = ieee80211_open; 580 dev->stop = ieee80211_stop; 581 dev->destructor = free_netdev; 582 /* we will validate the address ourselves in ->open */ 583 dev->validate_addr = NULL; 584 } 585 /* 586 * Called when the netdev is removed or, by the code below, before 587 * the interface type changes. 588 */ 589 static void ieee80211_teardown_sdata(struct net_device *dev) 590 { 591 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 592 struct ieee80211_local *local = sdata->local; 593 struct beacon_data *beacon; 594 struct sk_buff *skb; 595 int flushed; 596 int i; 597 598 /* free extra data */ 599 ieee80211_free_keys(sdata); 600 601 ieee80211_debugfs_remove_netdev(sdata); 602 603 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 604 __skb_queue_purge(&sdata->fragments[i].skb_list); 605 sdata->fragment_next = 0; 606 607 switch (sdata->vif.type) { 608 case NL80211_IFTYPE_AP: 609 beacon = sdata->u.ap.beacon; 610 rcu_assign_pointer(sdata->u.ap.beacon, NULL); 611 synchronize_rcu(); 612 kfree(beacon); 613 614 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) { 615 local->total_ps_buffered--; 616 dev_kfree_skb(skb); 617 } 618 619 break; 620 case NL80211_IFTYPE_MESH_POINT: 621 if (ieee80211_vif_is_mesh(&sdata->vif)) 622 mesh_rmc_free(sdata); 623 break; 624 case NL80211_IFTYPE_STATION: 625 case NL80211_IFTYPE_ADHOC: 626 kfree(sdata->u.sta.extra_ie); 627 kfree(sdata->u.sta.assocreq_ies); 628 kfree(sdata->u.sta.assocresp_ies); 629 kfree_skb(sdata->u.sta.probe_resp); 630 break; 631 case NL80211_IFTYPE_WDS: 632 case NL80211_IFTYPE_AP_VLAN: 633 case NL80211_IFTYPE_MONITOR: 634 break; 635 case NL80211_IFTYPE_UNSPECIFIED: 636 case __NL80211_IFTYPE_AFTER_LAST: 637 BUG(); 638 break; 639 } 640 641 flushed = sta_info_flush(local, sdata); 642 WARN_ON(flushed); 643 } 644 645 /* 646 * Helper function to initialise an interface to a specific type. 647 */ 648 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 649 enum nl80211_iftype type) 650 { 651 /* clear type-dependent union */ 652 memset(&sdata->u, 0, sizeof(sdata->u)); 653 654 /* and set some type-dependent values */ 655 sdata->vif.type = type; 656 sdata->dev->hard_start_xmit = ieee80211_subif_start_xmit; 657 sdata->wdev.iftype = type; 658 659 /* only monitor differs */ 660 sdata->dev->type = ARPHRD_ETHER; 661 662 switch (type) { 663 case NL80211_IFTYPE_AP: 664 skb_queue_head_init(&sdata->u.ap.ps_bc_buf); 665 INIT_LIST_HEAD(&sdata->u.ap.vlans); 666 break; 667 case NL80211_IFTYPE_STATION: 668 case NL80211_IFTYPE_ADHOC: 669 ieee80211_sta_setup_sdata(sdata); 670 break; 671 case NL80211_IFTYPE_MESH_POINT: 672 if (ieee80211_vif_is_mesh(&sdata->vif)) 673 ieee80211_mesh_init_sdata(sdata); 674 break; 675 case NL80211_IFTYPE_MONITOR: 676 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 677 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit; 678 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 679 MONITOR_FLAG_OTHER_BSS; 680 break; 681 case NL80211_IFTYPE_WDS: 682 case NL80211_IFTYPE_AP_VLAN: 683 break; 684 case NL80211_IFTYPE_UNSPECIFIED: 685 case __NL80211_IFTYPE_AFTER_LAST: 686 BUG(); 687 break; 688 } 689 690 ieee80211_debugfs_add_netdev(sdata); 691 } 692 693 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 694 enum nl80211_iftype type) 695 { 696 ASSERT_RTNL(); 697 698 if (type == sdata->vif.type) 699 return 0; 700 701 /* Setting ad-hoc mode on non-IBSS channel is not supported. */ 702 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && 703 type == NL80211_IFTYPE_ADHOC) 704 return -EOPNOTSUPP; 705 706 /* 707 * We could, here, on changes between IBSS/STA/MESH modes, 708 * invoke an MLME function instead that disassociates etc. 709 * and goes into the requested mode. 710 */ 711 712 if (netif_running(sdata->dev)) 713 return -EBUSY; 714 715 /* Purge and reset type-dependent state. */ 716 ieee80211_teardown_sdata(sdata->dev); 717 ieee80211_setup_sdata(sdata, type); 718 719 /* reset some values that shouldn't be kept across type changes */ 720 sdata->vif.bss_conf.basic_rates = 721 ieee80211_mandatory_rates(sdata->local, 722 sdata->local->hw.conf.channel->band); 723 sdata->drop_unencrypted = 0; 724 725 return 0; 726 } 727 728 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 729 struct net_device **new_dev, enum nl80211_iftype type, 730 struct vif_params *params) 731 { 732 struct net_device *ndev; 733 struct ieee80211_sub_if_data *sdata = NULL; 734 int ret, i; 735 736 ASSERT_RTNL(); 737 738 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, 739 name, ieee80211_if_setup); 740 if (!ndev) 741 return -ENOMEM; 742 743 ndev->needed_headroom = local->tx_headroom + 744 4*6 /* four MAC addresses */ 745 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 746 + 6 /* mesh */ 747 + 8 /* rfc1042/bridge tunnel */ 748 - ETH_HLEN /* ethernet hard_header_len */ 749 + IEEE80211_ENCRYPT_HEADROOM; 750 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 751 752 ret = dev_alloc_name(ndev, ndev->name); 753 if (ret < 0) 754 goto fail; 755 756 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 757 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 758 759 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ 760 sdata = netdev_priv(ndev); 761 ndev->ieee80211_ptr = &sdata->wdev; 762 763 /* initialise type-independent data */ 764 sdata->wdev.wiphy = local->hw.wiphy; 765 sdata->local = local; 766 sdata->dev = ndev; 767 768 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 769 skb_queue_head_init(&sdata->fragments[i].skb_list); 770 771 INIT_LIST_HEAD(&sdata->key_list); 772 773 sdata->force_unicast_rateidx = -1; 774 sdata->max_ratectrl_rateidx = -1; 775 776 /* setup type-dependent data */ 777 ieee80211_setup_sdata(sdata, type); 778 779 ret = register_netdevice(ndev); 780 if (ret) 781 goto fail; 782 783 ndev->uninit = ieee80211_teardown_sdata; 784 785 if (ieee80211_vif_is_mesh(&sdata->vif) && 786 params && params->mesh_id_len) 787 ieee80211_sdata_set_mesh_id(sdata, 788 params->mesh_id_len, 789 params->mesh_id); 790 791 list_add_tail_rcu(&sdata->list, &local->interfaces); 792 793 if (new_dev) 794 *new_dev = ndev; 795 796 return 0; 797 798 fail: 799 free_netdev(ndev); 800 return ret; 801 } 802 803 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 804 { 805 ASSERT_RTNL(); 806 807 list_del_rcu(&sdata->list); 808 synchronize_rcu(); 809 unregister_netdevice(sdata->dev); 810 } 811 812 /* 813 * Remove all interfaces, may only be called at hardware unregistration 814 * time because it doesn't do RCU-safe list removals. 815 */ 816 void ieee80211_remove_interfaces(struct ieee80211_local *local) 817 { 818 struct ieee80211_sub_if_data *sdata, *tmp; 819 820 ASSERT_RTNL(); 821 822 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 823 list_del(&sdata->list); 824 unregister_netdevice(sdata->dev); 825 } 826 } 827