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 memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN); 192 } 193 } 194 195 /* 196 * Validate the MAC address for this device. 197 */ 198 if (!is_valid_ether_addr(dev->dev_addr)) { 199 if (!local->open_count) 200 drv_stop(local); 201 return -EADDRNOTAVAIL; 202 } 203 204 switch (sdata->vif.type) { 205 case NL80211_IFTYPE_AP_VLAN: 206 /* no need to tell driver */ 207 break; 208 case NL80211_IFTYPE_MONITOR: 209 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 210 local->cooked_mntrs++; 211 break; 212 } 213 214 /* must be before the call to ieee80211_configure_filter */ 215 local->monitors++; 216 if (local->monitors == 1) { 217 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 218 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 219 } 220 221 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) 222 local->fif_fcsfail++; 223 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) 224 local->fif_plcpfail++; 225 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) { 226 local->fif_control++; 227 local->fif_pspoll++; 228 } 229 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) 230 local->fif_other_bss++; 231 232 ieee80211_configure_filter(local); 233 break; 234 default: 235 conf.vif = &sdata->vif; 236 conf.type = sdata->vif.type; 237 conf.mac_addr = dev->dev_addr; 238 res = drv_add_interface(local, &conf); 239 if (res) 240 goto err_stop; 241 242 if (ieee80211_vif_is_mesh(&sdata->vif)) { 243 local->fif_other_bss++; 244 ieee80211_configure_filter(local); 245 246 ieee80211_start_mesh(sdata); 247 } else if (sdata->vif.type == NL80211_IFTYPE_AP) { 248 local->fif_pspoll++; 249 250 ieee80211_configure_filter(local); 251 } 252 253 changed |= ieee80211_reset_erp_info(sdata); 254 ieee80211_bss_info_change_notify(sdata, changed); 255 ieee80211_enable_keys(sdata); 256 257 if (sdata->vif.type == NL80211_IFTYPE_STATION) 258 netif_carrier_off(dev); 259 else 260 netif_carrier_on(dev); 261 } 262 263 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 264 /* Create STA entry for the WDS peer */ 265 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 266 GFP_KERNEL); 267 if (!sta) { 268 res = -ENOMEM; 269 goto err_del_interface; 270 } 271 272 /* no locking required since STA is not live yet */ 273 sta->flags |= WLAN_STA_AUTHORIZED; 274 275 res = sta_info_insert(sta); 276 if (res) { 277 /* STA has been freed */ 278 goto err_del_interface; 279 } 280 } 281 282 /* 283 * set_multicast_list will be invoked by the networking core 284 * which will check whether any increments here were done in 285 * error and sync them down to the hardware as filter flags. 286 */ 287 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 288 atomic_inc(&local->iff_allmultis); 289 290 if (sdata->flags & IEEE80211_SDATA_PROMISC) 291 atomic_inc(&local->iff_promiscs); 292 293 hw_reconf_flags |= __ieee80211_recalc_idle(local); 294 295 local->open_count++; 296 if (hw_reconf_flags) { 297 ieee80211_hw_config(local, hw_reconf_flags); 298 /* 299 * set default queue parameters so drivers don't 300 * need to initialise the hardware if the hardware 301 * doesn't start up with sane defaults 302 */ 303 ieee80211_set_wmm_default(sdata); 304 } 305 306 ieee80211_recalc_ps(local, -1); 307 308 /* 309 * ieee80211_sta_work is disabled while network interface 310 * is down. Therefore, some configuration changes may not 311 * yet be effective. Trigger execution of ieee80211_sta_work 312 * to fix this. 313 */ 314 if (sdata->vif.type == NL80211_IFTYPE_STATION) 315 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work); 316 317 netif_start_queue(dev); 318 319 return 0; 320 err_del_interface: 321 drv_remove_interface(local, &conf); 322 err_stop: 323 if (!local->open_count) 324 drv_stop(local); 325 err_del_bss: 326 sdata->bss = NULL; 327 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 328 list_del(&sdata->u.vlan.list); 329 return res; 330 } 331 332 static int ieee80211_stop(struct net_device *dev) 333 { 334 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 335 struct ieee80211_local *local = sdata->local; 336 struct ieee80211_if_init_conf conf; 337 struct sta_info *sta; 338 unsigned long flags; 339 struct sk_buff *skb, *tmp; 340 u32 hw_reconf_flags = 0; 341 int i; 342 343 /* 344 * Stop TX on this interface first. 345 */ 346 netif_stop_queue(dev); 347 348 /* 349 * Now delete all active aggregation sessions. 350 */ 351 rcu_read_lock(); 352 353 list_for_each_entry_rcu(sta, &local->sta_list, list) { 354 if (sta->sdata == sdata) 355 ieee80211_sta_tear_down_BA_sessions(sta); 356 } 357 358 rcu_read_unlock(); 359 360 /* 361 * Remove all stations associated with this interface. 362 * 363 * This must be done before calling ops->remove_interface() 364 * because otherwise we can later invoke ops->sta_notify() 365 * whenever the STAs are removed, and that invalidates driver 366 * assumptions about always getting a vif pointer that is valid 367 * (because if we remove a STA after ops->remove_interface() 368 * the driver will have removed the vif info already!) 369 * 370 * We could relax this and only unlink the stations from the 371 * hash table and list but keep them on a per-sdata list that 372 * will be inserted back again when the interface is brought 373 * up again, but I don't currently see a use case for that, 374 * except with WDS which gets a STA entry created when it is 375 * brought up. 376 */ 377 sta_info_flush(local, sdata); 378 379 /* 380 * Don't count this interface for promisc/allmulti while it 381 * is down. dev_mc_unsync() will invoke set_multicast_list 382 * on the master interface which will sync these down to the 383 * hardware as filter flags. 384 */ 385 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 386 atomic_dec(&local->iff_allmultis); 387 388 if (sdata->flags & IEEE80211_SDATA_PROMISC) 389 atomic_dec(&local->iff_promiscs); 390 391 if (sdata->vif.type == NL80211_IFTYPE_AP) 392 local->fif_pspoll--; 393 394 netif_addr_lock_bh(dev); 395 spin_lock_bh(&local->filter_lock); 396 __dev_addr_unsync(&local->mc_list, &local->mc_count, 397 &dev->mc_list, &dev->mc_count); 398 spin_unlock_bh(&local->filter_lock); 399 netif_addr_unlock_bh(dev); 400 401 ieee80211_configure_filter(local); 402 403 del_timer_sync(&local->dynamic_ps_timer); 404 cancel_work_sync(&local->dynamic_ps_enable_work); 405 406 /* APs need special treatment */ 407 if (sdata->vif.type == NL80211_IFTYPE_AP) { 408 struct ieee80211_sub_if_data *vlan, *tmpsdata; 409 struct beacon_data *old_beacon = sdata->u.ap.beacon; 410 411 /* remove beacon */ 412 rcu_assign_pointer(sdata->u.ap.beacon, NULL); 413 synchronize_rcu(); 414 kfree(old_beacon); 415 416 /* down all dependent devices, that is VLANs */ 417 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 418 u.vlan.list) 419 dev_close(vlan->dev); 420 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 421 } 422 423 local->open_count--; 424 425 switch (sdata->vif.type) { 426 case NL80211_IFTYPE_AP_VLAN: 427 list_del(&sdata->u.vlan.list); 428 /* no need to tell driver */ 429 break; 430 case NL80211_IFTYPE_MONITOR: 431 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 432 local->cooked_mntrs--; 433 break; 434 } 435 436 local->monitors--; 437 if (local->monitors == 0) { 438 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 439 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 440 } 441 442 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) 443 local->fif_fcsfail--; 444 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) 445 local->fif_plcpfail--; 446 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) { 447 local->fif_pspoll--; 448 local->fif_control--; 449 } 450 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) 451 local->fif_other_bss--; 452 453 ieee80211_configure_filter(local); 454 break; 455 case NL80211_IFTYPE_STATION: 456 del_timer_sync(&sdata->u.mgd.chswitch_timer); 457 del_timer_sync(&sdata->u.mgd.timer); 458 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 459 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 460 /* 461 * If any of the timers fired while we waited for it, it will 462 * have queued its work. Now the work will be running again 463 * but will not rearm the timer again because it checks 464 * whether the interface is running, which, at this point, 465 * it no longer is. 466 */ 467 cancel_work_sync(&sdata->u.mgd.work); 468 cancel_work_sync(&sdata->u.mgd.chswitch_work); 469 cancel_work_sync(&sdata->u.mgd.monitor_work); 470 cancel_work_sync(&sdata->u.mgd.beacon_loss_work); 471 472 /* 473 * When we get here, the interface is marked down. 474 * Call synchronize_rcu() to wait for the RX path 475 * should it be using the interface and enqueuing 476 * frames at this very time on another CPU. 477 */ 478 synchronize_rcu(); 479 skb_queue_purge(&sdata->u.mgd.skb_queue); 480 /* fall through */ 481 case NL80211_IFTYPE_ADHOC: 482 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 483 del_timer_sync(&sdata->u.ibss.timer); 484 cancel_work_sync(&sdata->u.ibss.work); 485 synchronize_rcu(); 486 skb_queue_purge(&sdata->u.ibss.skb_queue); 487 } 488 /* fall through */ 489 case NL80211_IFTYPE_MESH_POINT: 490 if (ieee80211_vif_is_mesh(&sdata->vif)) { 491 /* other_bss and allmulti are always set on mesh 492 * ifaces */ 493 local->fif_other_bss--; 494 atomic_dec(&local->iff_allmultis); 495 496 ieee80211_configure_filter(local); 497 498 ieee80211_stop_mesh(sdata); 499 } 500 /* fall through */ 501 default: 502 if (local->scan_sdata == sdata) 503 ieee80211_scan_cancel(local); 504 505 /* 506 * Disable beaconing for AP and mesh, IBSS can't 507 * still be joined to a network at this point. 508 */ 509 if (sdata->vif.type == NL80211_IFTYPE_AP || 510 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) { 511 ieee80211_bss_info_change_notify(sdata, 512 BSS_CHANGED_BEACON_ENABLED); 513 } 514 515 conf.vif = &sdata->vif; 516 conf.type = sdata->vif.type; 517 conf.mac_addr = dev->dev_addr; 518 /* disable all keys for as long as this netdev is down */ 519 ieee80211_disable_keys(sdata); 520 drv_remove_interface(local, &conf); 521 } 522 523 sdata->bss = NULL; 524 525 hw_reconf_flags |= __ieee80211_recalc_idle(local); 526 527 ieee80211_recalc_ps(local, -1); 528 529 if (local->open_count == 0) { 530 ieee80211_clear_tx_pending(local); 531 ieee80211_stop_device(local); 532 533 /* no reconfiguring after stop! */ 534 hw_reconf_flags = 0; 535 } 536 537 /* do after stop to avoid reconfiguring when we stop anyway */ 538 if (hw_reconf_flags) 539 ieee80211_hw_config(local, hw_reconf_flags); 540 541 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 542 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 543 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 544 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 545 if (info->control.vif == &sdata->vif) { 546 __skb_unlink(skb, &local->pending[i]); 547 dev_kfree_skb_irq(skb); 548 } 549 } 550 } 551 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 552 553 return 0; 554 } 555 556 static void ieee80211_set_multicast_list(struct net_device *dev) 557 { 558 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 559 struct ieee80211_local *local = sdata->local; 560 int allmulti, promisc, sdata_allmulti, sdata_promisc; 561 562 allmulti = !!(dev->flags & IFF_ALLMULTI); 563 promisc = !!(dev->flags & IFF_PROMISC); 564 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 565 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 566 567 if (allmulti != sdata_allmulti) { 568 if (dev->flags & IFF_ALLMULTI) 569 atomic_inc(&local->iff_allmultis); 570 else 571 atomic_dec(&local->iff_allmultis); 572 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 573 } 574 575 if (promisc != sdata_promisc) { 576 if (dev->flags & IFF_PROMISC) 577 atomic_inc(&local->iff_promiscs); 578 else 579 atomic_dec(&local->iff_promiscs); 580 sdata->flags ^= IEEE80211_SDATA_PROMISC; 581 } 582 spin_lock_bh(&local->filter_lock); 583 __dev_addr_sync(&local->mc_list, &local->mc_count, 584 &dev->mc_list, &dev->mc_count); 585 spin_unlock_bh(&local->filter_lock); 586 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 587 } 588 589 /* 590 * Called when the netdev is removed or, by the code below, before 591 * the interface type changes. 592 */ 593 static void ieee80211_teardown_sdata(struct net_device *dev) 594 { 595 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 596 struct ieee80211_local *local = sdata->local; 597 struct beacon_data *beacon; 598 struct sk_buff *skb; 599 int flushed; 600 int i; 601 602 /* free extra data */ 603 ieee80211_free_keys(sdata); 604 605 ieee80211_debugfs_remove_netdev(sdata); 606 607 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 608 __skb_queue_purge(&sdata->fragments[i].skb_list); 609 sdata->fragment_next = 0; 610 611 switch (sdata->vif.type) { 612 case NL80211_IFTYPE_AP: 613 beacon = sdata->u.ap.beacon; 614 rcu_assign_pointer(sdata->u.ap.beacon, NULL); 615 synchronize_rcu(); 616 kfree(beacon); 617 618 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) { 619 local->total_ps_buffered--; 620 dev_kfree_skb(skb); 621 } 622 623 break; 624 case NL80211_IFTYPE_MESH_POINT: 625 if (ieee80211_vif_is_mesh(&sdata->vif)) 626 mesh_rmc_free(sdata); 627 break; 628 case NL80211_IFTYPE_ADHOC: 629 if (WARN_ON(sdata->u.ibss.presp)) 630 kfree_skb(sdata->u.ibss.presp); 631 break; 632 case NL80211_IFTYPE_STATION: 633 case NL80211_IFTYPE_WDS: 634 case NL80211_IFTYPE_AP_VLAN: 635 case NL80211_IFTYPE_MONITOR: 636 break; 637 case NL80211_IFTYPE_UNSPECIFIED: 638 case __NL80211_IFTYPE_AFTER_LAST: 639 BUG(); 640 break; 641 } 642 643 flushed = sta_info_flush(local, sdata); 644 WARN_ON(flushed); 645 } 646 647 static const struct net_device_ops ieee80211_dataif_ops = { 648 .ndo_open = ieee80211_open, 649 .ndo_stop = ieee80211_stop, 650 .ndo_uninit = ieee80211_teardown_sdata, 651 .ndo_start_xmit = ieee80211_subif_start_xmit, 652 .ndo_set_multicast_list = ieee80211_set_multicast_list, 653 .ndo_change_mtu = ieee80211_change_mtu, 654 .ndo_set_mac_address = eth_mac_addr, 655 }; 656 657 static const struct net_device_ops ieee80211_monitorif_ops = { 658 .ndo_open = ieee80211_open, 659 .ndo_stop = ieee80211_stop, 660 .ndo_uninit = ieee80211_teardown_sdata, 661 .ndo_start_xmit = ieee80211_monitor_start_xmit, 662 .ndo_set_multicast_list = ieee80211_set_multicast_list, 663 .ndo_change_mtu = ieee80211_change_mtu, 664 .ndo_set_mac_address = eth_mac_addr, 665 }; 666 667 static void ieee80211_if_setup(struct net_device *dev) 668 { 669 ether_setup(dev); 670 dev->netdev_ops = &ieee80211_dataif_ops; 671 dev->destructor = free_netdev; 672 } 673 674 /* 675 * Helper function to initialise an interface to a specific type. 676 */ 677 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 678 enum nl80211_iftype type) 679 { 680 /* clear type-dependent union */ 681 memset(&sdata->u, 0, sizeof(sdata->u)); 682 683 /* and set some type-dependent values */ 684 sdata->vif.type = type; 685 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 686 sdata->wdev.iftype = type; 687 688 /* only monitor differs */ 689 sdata->dev->type = ARPHRD_ETHER; 690 691 switch (type) { 692 case NL80211_IFTYPE_AP: 693 skb_queue_head_init(&sdata->u.ap.ps_bc_buf); 694 INIT_LIST_HEAD(&sdata->u.ap.vlans); 695 break; 696 case NL80211_IFTYPE_STATION: 697 ieee80211_sta_setup_sdata(sdata); 698 break; 699 case NL80211_IFTYPE_ADHOC: 700 ieee80211_ibss_setup_sdata(sdata); 701 break; 702 case NL80211_IFTYPE_MESH_POINT: 703 if (ieee80211_vif_is_mesh(&sdata->vif)) 704 ieee80211_mesh_init_sdata(sdata); 705 break; 706 case NL80211_IFTYPE_MONITOR: 707 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 708 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 709 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 710 MONITOR_FLAG_OTHER_BSS; 711 break; 712 case NL80211_IFTYPE_WDS: 713 case NL80211_IFTYPE_AP_VLAN: 714 break; 715 case NL80211_IFTYPE_UNSPECIFIED: 716 case __NL80211_IFTYPE_AFTER_LAST: 717 BUG(); 718 break; 719 } 720 721 ieee80211_debugfs_add_netdev(sdata); 722 } 723 724 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 725 enum nl80211_iftype type) 726 { 727 ASSERT_RTNL(); 728 729 if (type == sdata->vif.type) 730 return 0; 731 732 /* Setting ad-hoc mode on non-IBSS channel is not supported. */ 733 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && 734 type == NL80211_IFTYPE_ADHOC) 735 return -EOPNOTSUPP; 736 737 /* 738 * We could, here, on changes between IBSS/STA/MESH modes, 739 * invoke an MLME function instead that disassociates etc. 740 * and goes into the requested mode. 741 */ 742 743 if (netif_running(sdata->dev)) 744 return -EBUSY; 745 746 /* Purge and reset type-dependent state. */ 747 ieee80211_teardown_sdata(sdata->dev); 748 ieee80211_setup_sdata(sdata, type); 749 750 /* reset some values that shouldn't be kept across type changes */ 751 sdata->vif.bss_conf.basic_rates = 752 ieee80211_mandatory_rates(sdata->local, 753 sdata->local->hw.conf.channel->band); 754 sdata->drop_unencrypted = 0; 755 if (type == NL80211_IFTYPE_STATION) 756 sdata->u.mgd.use_4addr = false; 757 758 return 0; 759 } 760 761 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 762 struct net_device **new_dev, enum nl80211_iftype type, 763 struct vif_params *params) 764 { 765 struct net_device *ndev; 766 struct ieee80211_sub_if_data *sdata = NULL; 767 int ret, i; 768 769 ASSERT_RTNL(); 770 771 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, 772 name, ieee80211_if_setup); 773 if (!ndev) 774 return -ENOMEM; 775 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 776 777 ndev->needed_headroom = local->tx_headroom + 778 4*6 /* four MAC addresses */ 779 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 780 + 6 /* mesh */ 781 + 8 /* rfc1042/bridge tunnel */ 782 - ETH_HLEN /* ethernet hard_header_len */ 783 + IEEE80211_ENCRYPT_HEADROOM; 784 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 785 786 ret = dev_alloc_name(ndev, ndev->name); 787 if (ret < 0) 788 goto fail; 789 790 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 791 memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN); 792 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 793 794 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ 795 sdata = netdev_priv(ndev); 796 ndev->ieee80211_ptr = &sdata->wdev; 797 798 /* initialise type-independent data */ 799 sdata->wdev.wiphy = local->hw.wiphy; 800 sdata->local = local; 801 sdata->dev = ndev; 802 803 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 804 skb_queue_head_init(&sdata->fragments[i].skb_list); 805 806 INIT_LIST_HEAD(&sdata->key_list); 807 808 sdata->force_unicast_rateidx = -1; 809 sdata->max_ratectrl_rateidx = -1; 810 811 /* setup type-dependent data */ 812 ieee80211_setup_sdata(sdata, type); 813 814 if (params) { 815 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 816 if (type == NL80211_IFTYPE_STATION) 817 sdata->u.mgd.use_4addr = params->use_4addr; 818 } 819 820 ret = register_netdevice(ndev); 821 if (ret) 822 goto fail; 823 824 if (ieee80211_vif_is_mesh(&sdata->vif) && 825 params && params->mesh_id_len) 826 ieee80211_sdata_set_mesh_id(sdata, 827 params->mesh_id_len, 828 params->mesh_id); 829 830 mutex_lock(&local->iflist_mtx); 831 list_add_tail_rcu(&sdata->list, &local->interfaces); 832 mutex_unlock(&local->iflist_mtx); 833 834 if (new_dev) 835 *new_dev = ndev; 836 837 return 0; 838 839 fail: 840 free_netdev(ndev); 841 return ret; 842 } 843 844 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 845 { 846 ASSERT_RTNL(); 847 848 mutex_lock(&sdata->local->iflist_mtx); 849 list_del_rcu(&sdata->list); 850 mutex_unlock(&sdata->local->iflist_mtx); 851 852 synchronize_rcu(); 853 unregister_netdevice(sdata->dev); 854 } 855 856 /* 857 * Remove all interfaces, may only be called at hardware unregistration 858 * time because it doesn't do RCU-safe list removals. 859 */ 860 void ieee80211_remove_interfaces(struct ieee80211_local *local) 861 { 862 struct ieee80211_sub_if_data *sdata, *tmp; 863 LIST_HEAD(unreg_list); 864 865 ASSERT_RTNL(); 866 867 mutex_lock(&local->iflist_mtx); 868 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 869 list_del(&sdata->list); 870 871 unregister_netdevice_queue(sdata->dev, &unreg_list); 872 } 873 mutex_unlock(&local->iflist_mtx); 874 unregister_netdevice_many(&unreg_list); 875 } 876 877 static u32 ieee80211_idle_off(struct ieee80211_local *local, 878 const char *reason) 879 { 880 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 881 return 0; 882 883 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 884 printk(KERN_DEBUG "%s: device no longer idle - %s\n", 885 wiphy_name(local->hw.wiphy), reason); 886 #endif 887 888 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 889 return IEEE80211_CONF_CHANGE_IDLE; 890 } 891 892 static u32 ieee80211_idle_on(struct ieee80211_local *local) 893 { 894 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 895 return 0; 896 897 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 898 printk(KERN_DEBUG "%s: device now idle\n", 899 wiphy_name(local->hw.wiphy)); 900 #endif 901 902 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 903 return IEEE80211_CONF_CHANGE_IDLE; 904 } 905 906 u32 __ieee80211_recalc_idle(struct ieee80211_local *local) 907 { 908 struct ieee80211_sub_if_data *sdata; 909 int count = 0; 910 911 if (local->scanning) 912 return ieee80211_idle_off(local, "scanning"); 913 914 list_for_each_entry(sdata, &local->interfaces, list) { 915 if (!netif_running(sdata->dev)) 916 continue; 917 /* do not count disabled managed interfaces */ 918 if (sdata->vif.type == NL80211_IFTYPE_STATION && 919 !sdata->u.mgd.associated && 920 list_empty(&sdata->u.mgd.work_list)) 921 continue; 922 /* do not count unused IBSS interfaces */ 923 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 924 !sdata->u.ibss.ssid_len) 925 continue; 926 /* count everything else */ 927 count++; 928 } 929 930 if (!count) 931 return ieee80211_idle_on(local); 932 else 933 return ieee80211_idle_off(local, "in use"); 934 935 return 0; 936 } 937 938 void ieee80211_recalc_idle(struct ieee80211_local *local) 939 { 940 u32 chg; 941 942 mutex_lock(&local->iflist_mtx); 943 chg = __ieee80211_recalc_idle(local); 944 mutex_unlock(&local->iflist_mtx); 945 if (chg) 946 ieee80211_hw_config(local, chg); 947 } 948