2 * Interface handling (except master interface)
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>
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.
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"
20 #include "debugfs_netdev.h"
25 * DOC: Interface list locking
27 * The interface list in each struct ieee80211_local is protected
30 * (1) modifications may only be done under the RTNL
31 * (2) modifications and readers are protected against each other by
33 * (3) modifications are done in an RCU manner so atomic readers
34 * can traverse the list in RCU-safe blocks.
36 * As a consequence, reads (traversals) of the list can be protected
37 * by either the RTNL, the iflist_mtx or RCU.
41 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
44 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
46 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
48 /* FIX: what would be proper limits for MTU?
49 * This interface uses 802.3 frames. */
51 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
55 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
56 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
57 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
62 static inline int identical_mac_addr_allowed(int type1, int type2)
64 return type1 == NL80211_IFTYPE_MONITOR ||
65 type2 == NL80211_IFTYPE_MONITOR ||
66 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
67 (type1 == NL80211_IFTYPE_WDS &&
68 (type2 == NL80211_IFTYPE_WDS ||
69 type2 == NL80211_IFTYPE_AP)) ||
70 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
71 (type1 == NL80211_IFTYPE_AP_VLAN &&
72 (type2 == NL80211_IFTYPE_AP ||
73 type2 == NL80211_IFTYPE_AP_VLAN));
76 static int ieee80211_open(struct net_device *dev)
78 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
79 struct ieee80211_sub_if_data *nsdata;
80 struct ieee80211_local *local = sdata->local;
82 struct ieee80211_if_init_conf conf;
85 u32 hw_reconf_flags = 0;
86 u8 null_addr[ETH_ALEN] = {0};
88 /* fail early if user set an invalid address */
89 if (compare_ether_addr(dev->dev_addr, null_addr) &&
90 !is_valid_ether_addr(dev->dev_addr))
91 return -EADDRNOTAVAIL;
93 /* we hold the RTNL here so can safely walk the list */
94 list_for_each_entry(nsdata, &local->interfaces, list) {
95 struct net_device *ndev = nsdata->dev;
97 if (ndev != dev && netif_running(ndev)) {
99 * Allow only a single IBSS interface to be up at any
100 * time. This is restricted because beacon distribution
101 * cannot work properly if both are in the same IBSS.
103 * To remove this restriction we'd have to disallow them
104 * from setting the same SSID on different IBSS interfaces
105 * belonging to the same hardware. Then, however, we're
106 * faced with having to adopt two different TSF timers...
108 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
109 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
113 * The remaining checks are only performed for interfaces
114 * with the same MAC address.
116 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
120 * check whether it may have the same address
122 if (!identical_mac_addr_allowed(sdata->vif.type,
127 * can only add VLANs to enabled APs
129 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
130 nsdata->vif.type == NL80211_IFTYPE_AP)
131 sdata->bss = &nsdata->u.ap;
135 switch (sdata->vif.type) {
136 case NL80211_IFTYPE_WDS:
137 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
140 case NL80211_IFTYPE_AP_VLAN:
143 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
145 case NL80211_IFTYPE_AP:
146 sdata->bss = &sdata->u.ap;
148 case NL80211_IFTYPE_MESH_POINT:
149 if (!ieee80211_vif_is_mesh(&sdata->vif))
151 /* mesh ifaces must set allmulti to forward mcast traffic */
152 atomic_inc(&local->iff_allmultis);
154 case NL80211_IFTYPE_STATION:
155 case NL80211_IFTYPE_MONITOR:
156 case NL80211_IFTYPE_ADHOC:
157 /* no special treatment */
159 case NL80211_IFTYPE_UNSPECIFIED:
160 case __NL80211_IFTYPE_AFTER_LAST:
166 if (local->open_count == 0) {
168 if (local->ops->start)
169 res = local->ops->start(local_to_hw(local));
172 /* we're brought up, everything changes */
173 hw_reconf_flags = ~0;
174 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
178 * Check all interfaces and copy the hopefully now-present
179 * MAC address to those that have the special null one.
181 list_for_each_entry(nsdata, &local->interfaces, list) {
182 struct net_device *ndev = nsdata->dev;
185 * No need to check netif_running since we do not allow
186 * it to start up with this invalid address.
188 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
189 memcpy(ndev->dev_addr,
190 local->hw.wiphy->perm_addr,
194 if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
195 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
199 * Validate the MAC address for this device.
201 if (!is_valid_ether_addr(dev->dev_addr)) {
202 if (!local->open_count && local->ops->stop)
203 local->ops->stop(local_to_hw(local));
204 return -EADDRNOTAVAIL;
207 switch (sdata->vif.type) {
208 case NL80211_IFTYPE_AP_VLAN:
209 /* no need to tell driver */
211 case NL80211_IFTYPE_MONITOR:
212 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
213 local->cooked_mntrs++;
217 /* must be before the call to ieee80211_configure_filter */
219 if (local->monitors == 1) {
220 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
221 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
224 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
225 local->fif_fcsfail++;
226 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
227 local->fif_plcpfail++;
228 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
229 local->fif_control++;
230 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
231 local->fif_other_bss++;
233 netif_addr_lock_bh(local->mdev);
234 ieee80211_configure_filter(local);
235 netif_addr_unlock_bh(local->mdev);
237 case NL80211_IFTYPE_STATION:
238 sdata->u.mgd.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
241 conf.vif = &sdata->vif;
242 conf.type = sdata->vif.type;
243 conf.mac_addr = dev->dev_addr;
244 res = local->ops->add_interface(local_to_hw(local), &conf);
248 if (ieee80211_vif_is_mesh(&sdata->vif)) {
249 local->fif_other_bss++;
250 netif_addr_lock_bh(local->mdev);
251 ieee80211_configure_filter(local);
252 netif_addr_unlock_bh(local->mdev);
254 ieee80211_start_mesh(sdata);
256 changed |= ieee80211_reset_erp_info(sdata);
257 ieee80211_bss_info_change_notify(sdata, changed);
258 ieee80211_enable_keys(sdata);
260 if (sdata->vif.type == NL80211_IFTYPE_STATION)
261 netif_carrier_off(dev);
263 netif_carrier_on(dev);
266 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
267 /* Create STA entry for the WDS peer */
268 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
272 goto err_del_interface;
275 /* no locking required since STA is not live yet */
276 sta->flags |= WLAN_STA_AUTHORIZED;
278 res = sta_info_insert(sta);
280 /* STA has been freed */
281 goto err_del_interface;
285 if (local->open_count == 0) {
286 res = dev_open(local->mdev);
289 goto err_del_interface;
290 tasklet_enable(&local->tx_pending_tasklet);
291 tasklet_enable(&local->tasklet);
295 * set_multicast_list will be invoked by the networking core
296 * which will check whether any increments here were done in
297 * error and sync them down to the hardware as filter flags.
299 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
300 atomic_inc(&local->iff_allmultis);
302 if (sdata->flags & IEEE80211_SDATA_PROMISC)
303 atomic_inc(&local->iff_promiscs);
306 if (hw_reconf_flags) {
307 ieee80211_hw_config(local, hw_reconf_flags);
309 * set default queue parameters so drivers don't
310 * need to initialise the hardware if the hardware
311 * doesn't start up with sane defaults
313 ieee80211_set_wmm_default(sdata);
316 ieee80211_recalc_ps(local, -1);
319 * ieee80211_sta_work is disabled while network interface
320 * is down. Therefore, some configuration changes may not
321 * yet be effective. Trigger execution of ieee80211_sta_work
324 if (sdata->vif.type == NL80211_IFTYPE_STATION)
325 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
327 netif_tx_start_all_queues(dev);
331 local->ops->remove_interface(local_to_hw(local), &conf);
333 if (!local->open_count && local->ops->stop)
334 local->ops->stop(local_to_hw(local));
337 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
338 list_del(&sdata->u.vlan.list);
342 static int ieee80211_stop(struct net_device *dev)
344 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
345 struct ieee80211_local *local = sdata->local;
346 struct ieee80211_if_init_conf conf;
347 struct sta_info *sta;
348 u32 hw_reconf_flags = 0;
351 * Stop TX on this interface first.
353 netif_tx_stop_all_queues(dev);
356 * Now delete all active aggregation sessions.
360 list_for_each_entry_rcu(sta, &local->sta_list, list) {
361 if (sta->sdata == sdata)
362 ieee80211_sta_tear_down_BA_sessions(sta);
368 * Announce that we are leaving the network, in case we are a
369 * station interface type. This must be done before removing
370 * all stations associated with sta_info_flush, otherwise STA
371 * information will be gone and no announce being done.
373 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
374 if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED)
375 ieee80211_sta_deauthenticate(sdata,
376 WLAN_REASON_DEAUTH_LEAVING);
380 * Remove all stations associated with this interface.
382 * This must be done before calling ops->remove_interface()
383 * because otherwise we can later invoke ops->sta_notify()
384 * whenever the STAs are removed, and that invalidates driver
385 * assumptions about always getting a vif pointer that is valid
386 * (because if we remove a STA after ops->remove_interface()
387 * the driver will have removed the vif info already!)
389 * We could relax this and only unlink the stations from the
390 * hash table and list but keep them on a per-sdata list that
391 * will be inserted back again when the interface is brought
392 * up again, but I don't currently see a use case for that,
393 * except with WDS which gets a STA entry created when it is
396 sta_info_flush(local, sdata);
399 * Don't count this interface for promisc/allmulti while it
400 * is down. dev_mc_unsync() will invoke set_multicast_list
401 * on the master interface which will sync these down to the
402 * hardware as filter flags.
404 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
405 atomic_dec(&local->iff_allmultis);
407 if (sdata->flags & IEEE80211_SDATA_PROMISC)
408 atomic_dec(&local->iff_promiscs);
410 dev_mc_unsync(local->mdev, dev);
411 del_timer_sync(&local->dynamic_ps_timer);
412 cancel_work_sync(&local->dynamic_ps_enable_work);
414 /* APs need special treatment */
415 if (sdata->vif.type == NL80211_IFTYPE_AP) {
416 struct ieee80211_sub_if_data *vlan, *tmp;
417 struct beacon_data *old_beacon = sdata->u.ap.beacon;
420 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
424 /* down all dependent devices, that is VLANs */
425 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
427 dev_close(vlan->dev);
428 WARN_ON(!list_empty(&sdata->u.ap.vlans));
433 switch (sdata->vif.type) {
434 case NL80211_IFTYPE_AP_VLAN:
435 list_del(&sdata->u.vlan.list);
436 /* no need to tell driver */
438 case NL80211_IFTYPE_MONITOR:
439 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
440 local->cooked_mntrs--;
445 if (local->monitors == 0) {
446 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
447 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
450 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
451 local->fif_fcsfail--;
452 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
453 local->fif_plcpfail--;
454 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
455 local->fif_control--;
456 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
457 local->fif_other_bss--;
459 netif_addr_lock_bh(local->mdev);
460 ieee80211_configure_filter(local);
461 netif_addr_unlock_bh(local->mdev);
463 case NL80211_IFTYPE_STATION:
464 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
465 del_timer_sync(&sdata->u.mgd.chswitch_timer);
466 del_timer_sync(&sdata->u.mgd.timer);
468 * If the timer fired while we waited for it, it will have
469 * requeued the work. Now the work will be running again
470 * but will not rearm the timer again because it checks
471 * whether the interface is running, which, at this point,
474 cancel_work_sync(&sdata->u.mgd.work);
475 cancel_work_sync(&sdata->u.mgd.chswitch_work);
477 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
480 * When we get here, the interface is marked down.
481 * Call synchronize_rcu() to wait for the RX path
482 * should it be using the interface and enqueuing
483 * frames at this very time on another CPU.
486 skb_queue_purge(&sdata->u.mgd.skb_queue);
488 sdata->u.mgd.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
489 IEEE80211_STA_TKIP_WEP_USED);
490 kfree(sdata->u.mgd.extra_ie);
491 sdata->u.mgd.extra_ie = NULL;
492 sdata->u.mgd.extra_ie_len = 0;
494 case NL80211_IFTYPE_ADHOC:
495 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
496 del_timer_sync(&sdata->u.ibss.timer);
497 cancel_work_sync(&sdata->u.ibss.work);
499 skb_queue_purge(&sdata->u.ibss.skb_queue);
502 case NL80211_IFTYPE_MESH_POINT:
503 if (ieee80211_vif_is_mesh(&sdata->vif)) {
504 /* other_bss and allmulti are always set on mesh
506 local->fif_other_bss--;
507 atomic_dec(&local->iff_allmultis);
509 netif_addr_lock_bh(local->mdev);
510 ieee80211_configure_filter(local);
511 netif_addr_unlock_bh(local->mdev);
513 ieee80211_stop_mesh(sdata);
517 if (local->scan_sdata == sdata) {
518 if (!local->ops->hw_scan)
519 cancel_delayed_work_sync(&local->scan_work);
521 * The software scan can no longer run now, so we can
522 * clear out the scan_sdata reference. However, the
523 * hardware scan may still be running. The complete
524 * function must be prepared to handle a NULL value.
526 local->scan_sdata = NULL;
528 * The memory barrier guarantees that another CPU
529 * that is hardware-scanning will now see the fact
530 * that this interface is gone.
534 * If software scanning, complete the scan but since
535 * the scan_sdata is NULL already don't send out a
536 * scan event to userspace -- the scan is incomplete.
538 if (local->sw_scanning)
539 ieee80211_scan_completed(&local->hw, true);
542 conf.vif = &sdata->vif;
543 conf.type = sdata->vif.type;
544 conf.mac_addr = dev->dev_addr;
545 /* disable all keys for as long as this netdev is down */
546 ieee80211_disable_keys(sdata);
547 local->ops->remove_interface(local_to_hw(local), &conf);
552 if (local->open_count == 0) {
553 if (netif_running(local->mdev))
554 dev_close(local->mdev);
556 if (local->ops->stop)
557 local->ops->stop(local_to_hw(local));
559 ieee80211_led_radio(local, 0);
561 flush_workqueue(local->hw.workqueue);
563 tasklet_disable(&local->tx_pending_tasklet);
564 tasklet_disable(&local->tasklet);
566 /* no reconfiguring after stop! */
570 ieee80211_recalc_ps(local, -1);
572 /* do after stop to avoid reconfiguring when we stop anyway */
574 ieee80211_hw_config(local, hw_reconf_flags);
579 static void ieee80211_set_multicast_list(struct net_device *dev)
581 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
582 struct ieee80211_local *local = sdata->local;
583 int allmulti, promisc, sdata_allmulti, sdata_promisc;
585 allmulti = !!(dev->flags & IFF_ALLMULTI);
586 promisc = !!(dev->flags & IFF_PROMISC);
587 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
588 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
590 if (allmulti != sdata_allmulti) {
591 if (dev->flags & IFF_ALLMULTI)
592 atomic_inc(&local->iff_allmultis);
594 atomic_dec(&local->iff_allmultis);
595 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
598 if (promisc != sdata_promisc) {
599 if (dev->flags & IFF_PROMISC)
600 atomic_inc(&local->iff_promiscs);
602 atomic_dec(&local->iff_promiscs);
603 sdata->flags ^= IEEE80211_SDATA_PROMISC;
606 dev_mc_sync(local->mdev, dev);
610 * Called when the netdev is removed or, by the code below, before
611 * the interface type changes.
613 static void ieee80211_teardown_sdata(struct net_device *dev)
615 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
616 struct ieee80211_local *local = sdata->local;
617 struct beacon_data *beacon;
622 /* free extra data */
623 ieee80211_free_keys(sdata);
625 ieee80211_debugfs_remove_netdev(sdata);
627 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
628 __skb_queue_purge(&sdata->fragments[i].skb_list);
629 sdata->fragment_next = 0;
631 switch (sdata->vif.type) {
632 case NL80211_IFTYPE_AP:
633 beacon = sdata->u.ap.beacon;
634 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
638 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
639 local->total_ps_buffered--;
644 case NL80211_IFTYPE_MESH_POINT:
645 if (ieee80211_vif_is_mesh(&sdata->vif))
646 mesh_rmc_free(sdata);
648 case NL80211_IFTYPE_ADHOC:
649 if (WARN_ON(sdata->u.ibss.presp))
650 kfree_skb(sdata->u.ibss.presp);
652 case NL80211_IFTYPE_STATION:
653 kfree(sdata->u.mgd.extra_ie);
654 kfree(sdata->u.mgd.assocreq_ies);
655 kfree(sdata->u.mgd.assocresp_ies);
656 kfree(sdata->u.mgd.sme_auth_ie);
658 case NL80211_IFTYPE_WDS:
659 case NL80211_IFTYPE_AP_VLAN:
660 case NL80211_IFTYPE_MONITOR:
662 case NL80211_IFTYPE_UNSPECIFIED:
663 case __NL80211_IFTYPE_AFTER_LAST:
668 flushed = sta_info_flush(local, sdata);
672 static const struct net_device_ops ieee80211_dataif_ops = {
673 .ndo_open = ieee80211_open,
674 .ndo_stop = ieee80211_stop,
675 .ndo_uninit = ieee80211_teardown_sdata,
676 .ndo_start_xmit = ieee80211_subif_start_xmit,
677 .ndo_set_multicast_list = ieee80211_set_multicast_list,
678 .ndo_change_mtu = ieee80211_change_mtu,
679 .ndo_set_mac_address = eth_mac_addr,
682 static const struct net_device_ops ieee80211_monitorif_ops = {
683 .ndo_open = ieee80211_open,
684 .ndo_stop = ieee80211_stop,
685 .ndo_uninit = ieee80211_teardown_sdata,
686 .ndo_start_xmit = ieee80211_monitor_start_xmit,
687 .ndo_set_multicast_list = ieee80211_set_multicast_list,
688 .ndo_change_mtu = ieee80211_change_mtu,
689 .ndo_set_mac_address = eth_mac_addr,
692 static void ieee80211_if_setup(struct net_device *dev)
695 dev->netdev_ops = &ieee80211_dataif_ops;
696 dev->wireless_handlers = &ieee80211_iw_handler_def;
697 dev->destructor = free_netdev;
701 * Helper function to initialise an interface to a specific type.
703 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
704 enum nl80211_iftype type)
706 /* clear type-dependent union */
707 memset(&sdata->u, 0, sizeof(sdata->u));
709 /* and set some type-dependent values */
710 sdata->vif.type = type;
711 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
712 sdata->wdev.iftype = type;
714 /* only monitor differs */
715 sdata->dev->type = ARPHRD_ETHER;
718 case NL80211_IFTYPE_AP:
719 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
720 INIT_LIST_HEAD(&sdata->u.ap.vlans);
722 case NL80211_IFTYPE_STATION:
723 ieee80211_sta_setup_sdata(sdata);
725 case NL80211_IFTYPE_ADHOC:
726 ieee80211_ibss_setup_sdata(sdata);
728 case NL80211_IFTYPE_MESH_POINT:
729 if (ieee80211_vif_is_mesh(&sdata->vif))
730 ieee80211_mesh_init_sdata(sdata);
732 case NL80211_IFTYPE_MONITOR:
733 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
734 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
735 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
736 MONITOR_FLAG_OTHER_BSS;
738 case NL80211_IFTYPE_WDS:
739 case NL80211_IFTYPE_AP_VLAN:
741 case NL80211_IFTYPE_UNSPECIFIED:
742 case __NL80211_IFTYPE_AFTER_LAST:
747 ieee80211_debugfs_add_netdev(sdata);
750 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
751 enum nl80211_iftype type)
755 if (type == sdata->vif.type)
758 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
759 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
760 type == NL80211_IFTYPE_ADHOC)
764 * We could, here, on changes between IBSS/STA/MESH modes,
765 * invoke an MLME function instead that disassociates etc.
766 * and goes into the requested mode.
769 if (netif_running(sdata->dev))
772 /* Purge and reset type-dependent state. */
773 ieee80211_teardown_sdata(sdata->dev);
774 ieee80211_setup_sdata(sdata, type);
776 /* reset some values that shouldn't be kept across type changes */
777 sdata->vif.bss_conf.basic_rates =
778 ieee80211_mandatory_rates(sdata->local,
779 sdata->local->hw.conf.channel->band);
780 sdata->drop_unencrypted = 0;
785 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
786 struct net_device **new_dev, enum nl80211_iftype type,
787 struct vif_params *params)
789 struct net_device *ndev;
790 struct ieee80211_sub_if_data *sdata = NULL;
795 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
796 name, ieee80211_if_setup);
800 ndev->needed_headroom = local->tx_headroom +
801 4*6 /* four MAC addresses */
802 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
804 + 8 /* rfc1042/bridge tunnel */
805 - ETH_HLEN /* ethernet hard_header_len */
806 + IEEE80211_ENCRYPT_HEADROOM;
807 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
809 ret = dev_alloc_name(ndev, ndev->name);
813 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
814 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
815 ndev->features |= NETIF_F_NETNS_LOCAL;
817 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
818 sdata = netdev_priv(ndev);
819 ndev->ieee80211_ptr = &sdata->wdev;
821 /* initialise type-independent data */
822 sdata->wdev.wiphy = local->hw.wiphy;
823 sdata->local = local;
826 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
827 skb_queue_head_init(&sdata->fragments[i].skb_list);
829 INIT_LIST_HEAD(&sdata->key_list);
831 sdata->force_unicast_rateidx = -1;
832 sdata->max_ratectrl_rateidx = -1;
834 /* setup type-dependent data */
835 ieee80211_setup_sdata(sdata, type);
837 ret = register_netdevice(ndev);
841 if (ieee80211_vif_is_mesh(&sdata->vif) &&
842 params && params->mesh_id_len)
843 ieee80211_sdata_set_mesh_id(sdata,
847 mutex_lock(&local->iflist_mtx);
848 list_add_tail_rcu(&sdata->list, &local->interfaces);
849 mutex_unlock(&local->iflist_mtx);
861 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
865 mutex_lock(&sdata->local->iflist_mtx);
866 list_del_rcu(&sdata->list);
867 mutex_unlock(&sdata->local->iflist_mtx);
870 unregister_netdevice(sdata->dev);
874 * Remove all interfaces, may only be called at hardware unregistration
875 * time because it doesn't do RCU-safe list removals.
877 void ieee80211_remove_interfaces(struct ieee80211_local *local)
879 struct ieee80211_sub_if_data *sdata, *tmp;
883 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
885 * we cannot hold the iflist_mtx across unregister_netdevice,
886 * but we only need to hold it for list modifications to lock
887 * out readers since we're under the RTNL here as all other
890 mutex_lock(&local->iflist_mtx);
891 list_del(&sdata->list);
892 mutex_unlock(&local->iflist_mtx);
894 unregister_netdevice(sdata->dev);