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"
23 #include "driver-ops.h"
26 * DOC: Interface list locking
28 * The interface list in each struct ieee80211_local is protected
31 * (1) modifications may only be done under the RTNL
32 * (2) modifications and readers are protected against each other by
34 * (3) modifications are done in an RCU manner so atomic readers
35 * can traverse the list in RCU-safe blocks.
37 * As a consequence, reads (traversals) of the list can be protected
38 * by either the RTNL, the iflist_mtx or RCU.
42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
45 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
47 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
49 /* FIX: what would be proper limits for MTU?
50 * This interface uses 802.3 frames. */
52 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
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 */
63 static inline int identical_mac_addr_allowed(int type1, int type2)
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));
77 static int ieee80211_open(struct net_device *dev)
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;
83 struct ieee80211_if_init_conf conf;
86 u32 hw_reconf_flags = 0;
87 u8 null_addr[ETH_ALEN] = {0};
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;
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;
98 if (ndev != dev && netif_running(ndev)) {
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.
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...
109 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
110 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
114 * The remaining checks are only performed for interfaces
115 * with the same MAC address.
117 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
121 * check whether it may have the same address
123 if (!identical_mac_addr_allowed(sdata->vif.type,
128 * can only add VLANs to enabled APs
130 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
131 nsdata->vif.type == NL80211_IFTYPE_AP)
132 sdata->bss = &nsdata->u.ap;
136 switch (sdata->vif.type) {
137 case NL80211_IFTYPE_WDS:
138 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
141 case NL80211_IFTYPE_AP_VLAN:
144 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
146 case NL80211_IFTYPE_AP:
147 sdata->bss = &sdata->u.ap;
149 case NL80211_IFTYPE_MESH_POINT:
150 if (!ieee80211_vif_is_mesh(&sdata->vif))
152 /* mesh ifaces must set allmulti to forward mcast traffic */
153 atomic_inc(&local->iff_allmultis);
155 case NL80211_IFTYPE_STATION:
156 case NL80211_IFTYPE_MONITOR:
157 case NL80211_IFTYPE_ADHOC:
158 /* no special treatment */
160 case NL80211_IFTYPE_UNSPECIFIED:
161 case __NL80211_IFTYPE_AFTER_LAST:
167 if (local->open_count == 0) {
168 res = drv_start(local);
171 /* we're brought up, everything changes */
172 hw_reconf_flags = ~0;
173 ieee80211_led_radio(local, true);
177 * Check all interfaces and copy the hopefully now-present
178 * MAC address to those that have the special null one.
180 list_for_each_entry(nsdata, &local->interfaces, list) {
181 struct net_device *ndev = nsdata->dev;
184 * No need to check netif_running since we do not allow
185 * it to start up with this invalid address.
187 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
188 memcpy(ndev->dev_addr,
189 local->hw.wiphy->perm_addr,
193 if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
194 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
198 * Validate the MAC address for this device.
200 if (!is_valid_ether_addr(dev->dev_addr)) {
201 if (!local->open_count)
203 return -EADDRNOTAVAIL;
206 switch (sdata->vif.type) {
207 case NL80211_IFTYPE_AP_VLAN:
208 /* no need to tell driver */
210 case NL80211_IFTYPE_MONITOR:
211 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
212 local->cooked_mntrs++;
216 /* must be before the call to ieee80211_configure_filter */
218 if (local->monitors == 1) {
219 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
220 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
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++;
232 netif_addr_lock_bh(local->mdev);
233 ieee80211_configure_filter(local);
234 netif_addr_unlock_bh(local->mdev);
236 case NL80211_IFTYPE_STATION:
237 sdata->u.mgd.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
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);
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);
253 ieee80211_start_mesh(sdata);
255 changed |= ieee80211_reset_erp_info(sdata);
256 ieee80211_bss_info_change_notify(sdata, changed);
257 ieee80211_enable_keys(sdata);
259 if (sdata->vif.type == NL80211_IFTYPE_STATION)
260 netif_carrier_off(dev);
262 netif_carrier_on(dev);
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,
271 goto err_del_interface;
274 /* no locking required since STA is not live yet */
275 sta->flags |= WLAN_STA_AUTHORIZED;
277 res = sta_info_insert(sta);
279 /* STA has been freed */
280 goto err_del_interface;
284 if (local->open_count == 0) {
285 res = dev_open(local->mdev);
288 goto err_del_interface;
289 tasklet_enable(&local->tx_pending_tasklet);
290 tasklet_enable(&local->tasklet);
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.
298 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
299 atomic_inc(&local->iff_allmultis);
301 if (sdata->flags & IEEE80211_SDATA_PROMISC)
302 atomic_inc(&local->iff_promiscs);
304 hw_reconf_flags |= __ieee80211_recalc_idle(local);
307 if (hw_reconf_flags) {
308 ieee80211_hw_config(local, hw_reconf_flags);
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
314 ieee80211_set_wmm_default(sdata);
317 ieee80211_recalc_ps(local, -1);
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
325 if (sdata->vif.type == NL80211_IFTYPE_STATION)
326 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
328 netif_tx_start_all_queues(dev);
332 drv_remove_interface(local, &conf);
334 if (!local->open_count)
338 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
339 list_del(&sdata->u.vlan.list);
343 static int ieee80211_stop(struct net_device *dev)
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;
352 * Stop TX on this interface first.
354 netif_tx_stop_all_queues(dev);
357 * Now delete all active aggregation sessions.
361 list_for_each_entry_rcu(sta, &local->sta_list, list) {
362 if (sta->sdata == sdata)
363 ieee80211_sta_tear_down_BA_sessions(sta);
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.
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);
381 * Remove all stations associated with this interface.
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!)
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
397 sta_info_flush(local, sdata);
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.
405 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
406 atomic_dec(&local->iff_allmultis);
408 if (sdata->flags & IEEE80211_SDATA_PROMISC)
409 atomic_dec(&local->iff_promiscs);
411 dev_mc_unsync(local->mdev, dev);
412 del_timer_sync(&local->dynamic_ps_timer);
413 cancel_work_sync(&local->dynamic_ps_enable_work);
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;
421 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
425 /* down all dependent devices, that is VLANs */
426 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
428 dev_close(vlan->dev);
429 WARN_ON(!list_empty(&sdata->u.ap.vlans));
434 switch (sdata->vif.type) {
435 case NL80211_IFTYPE_AP_VLAN:
436 list_del(&sdata->u.vlan.list);
437 /* no need to tell driver */
439 case NL80211_IFTYPE_MONITOR:
440 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
441 local->cooked_mntrs--;
446 if (local->monitors == 0) {
447 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
448 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
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--;
460 netif_addr_lock_bh(local->mdev);
461 ieee80211_configure_filter(local);
462 netif_addr_unlock_bh(local->mdev);
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);
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,
475 cancel_work_sync(&sdata->u.mgd.work);
476 cancel_work_sync(&sdata->u.mgd.chswitch_work);
478 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
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.
487 skb_queue_purge(&sdata->u.mgd.skb_queue);
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;
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);
500 skb_queue_purge(&sdata->u.ibss.skb_queue);
503 case NL80211_IFTYPE_MESH_POINT:
504 if (ieee80211_vif_is_mesh(&sdata->vif)) {
505 /* other_bss and allmulti are always set on mesh
507 local->fif_other_bss--;
508 atomic_dec(&local->iff_allmultis);
510 netif_addr_lock_bh(local->mdev);
511 ieee80211_configure_filter(local);
512 netif_addr_unlock_bh(local->mdev);
514 ieee80211_stop_mesh(sdata);
518 if (local->scan_sdata == sdata) {
519 if (!local->ops->hw_scan)
520 cancel_delayed_work_sync(&local->scan_work);
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.
527 local->scan_sdata = NULL;
529 * The memory barrier guarantees that another CPU
530 * that is hardware-scanning will now see the fact
531 * that this interface is gone.
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.
539 if (local->sw_scanning)
540 ieee80211_scan_completed(&local->hw, true);
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);
553 hw_reconf_flags |= __ieee80211_recalc_idle(local);
555 ieee80211_recalc_ps(local, -1);
557 if (local->open_count == 0) {
558 if (netif_running(local->mdev))
559 dev_close(local->mdev);
563 ieee80211_led_radio(local, false);
565 flush_workqueue(local->hw.workqueue);
567 tasklet_disable(&local->tx_pending_tasklet);
568 tasklet_disable(&local->tasklet);
570 /* no reconfiguring after stop! */
574 /* do after stop to avoid reconfiguring when we stop anyway */
576 ieee80211_hw_config(local, hw_reconf_flags);
581 static void ieee80211_set_multicast_list(struct net_device *dev)
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;
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);
592 if (allmulti != sdata_allmulti) {
593 if (dev->flags & IFF_ALLMULTI)
594 atomic_inc(&local->iff_allmultis);
596 atomic_dec(&local->iff_allmultis);
597 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
600 if (promisc != sdata_promisc) {
601 if (dev->flags & IFF_PROMISC)
602 atomic_inc(&local->iff_promiscs);
604 atomic_dec(&local->iff_promiscs);
605 sdata->flags ^= IEEE80211_SDATA_PROMISC;
608 dev_mc_sync(local->mdev, dev);
612 * Called when the netdev is removed or, by the code below, before
613 * the interface type changes.
615 static void ieee80211_teardown_sdata(struct net_device *dev)
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;
624 /* free extra data */
625 ieee80211_free_keys(sdata);
627 ieee80211_debugfs_remove_netdev(sdata);
629 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
630 __skb_queue_purge(&sdata->fragments[i].skb_list);
631 sdata->fragment_next = 0;
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);
640 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
641 local->total_ps_buffered--;
646 case NL80211_IFTYPE_MESH_POINT:
647 if (ieee80211_vif_is_mesh(&sdata->vif))
648 mesh_rmc_free(sdata);
650 case NL80211_IFTYPE_ADHOC:
651 if (WARN_ON(sdata->u.ibss.presp))
652 kfree_skb(sdata->u.ibss.presp);
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);
660 case NL80211_IFTYPE_WDS:
661 case NL80211_IFTYPE_AP_VLAN:
662 case NL80211_IFTYPE_MONITOR:
664 case NL80211_IFTYPE_UNSPECIFIED:
665 case __NL80211_IFTYPE_AFTER_LAST:
670 flushed = sta_info_flush(local, sdata);
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,
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,
694 static void ieee80211_if_setup(struct net_device *dev)
697 dev->netdev_ops = &ieee80211_dataif_ops;
698 dev->wireless_handlers = &ieee80211_iw_handler_def;
699 dev->destructor = free_netdev;
703 * Helper function to initialise an interface to a specific type.
705 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
706 enum nl80211_iftype type)
708 /* clear type-dependent union */
709 memset(&sdata->u, 0, sizeof(sdata->u));
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;
716 /* only monitor differs */
717 sdata->dev->type = ARPHRD_ETHER;
720 case NL80211_IFTYPE_AP:
721 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
722 INIT_LIST_HEAD(&sdata->u.ap.vlans);
724 case NL80211_IFTYPE_STATION:
725 ieee80211_sta_setup_sdata(sdata);
727 case NL80211_IFTYPE_ADHOC:
728 ieee80211_ibss_setup_sdata(sdata);
730 case NL80211_IFTYPE_MESH_POINT:
731 if (ieee80211_vif_is_mesh(&sdata->vif))
732 ieee80211_mesh_init_sdata(sdata);
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;
740 case NL80211_IFTYPE_WDS:
741 case NL80211_IFTYPE_AP_VLAN:
743 case NL80211_IFTYPE_UNSPECIFIED:
744 case __NL80211_IFTYPE_AFTER_LAST:
749 ieee80211_debugfs_add_netdev(sdata);
752 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
753 enum nl80211_iftype type)
757 if (type == sdata->vif.type)
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)
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.
771 if (netif_running(sdata->dev))
774 /* Purge and reset type-dependent state. */
775 ieee80211_teardown_sdata(sdata->dev);
776 ieee80211_setup_sdata(sdata, type);
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;
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)
791 struct net_device *ndev;
792 struct ieee80211_sub_if_data *sdata = NULL;
797 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
798 name, ieee80211_if_setup);
802 ndev->needed_headroom = local->tx_headroom +
803 4*6 /* four MAC addresses */
804 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
806 + 8 /* rfc1042/bridge tunnel */
807 - ETH_HLEN /* ethernet hard_header_len */
808 + IEEE80211_ENCRYPT_HEADROOM;
809 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
811 ret = dev_alloc_name(ndev, ndev->name);
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;
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;
823 /* initialise type-independent data */
824 sdata->wdev.wiphy = local->hw.wiphy;
825 sdata->local = local;
828 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
829 skb_queue_head_init(&sdata->fragments[i].skb_list);
831 INIT_LIST_HEAD(&sdata->key_list);
833 sdata->force_unicast_rateidx = -1;
834 sdata->max_ratectrl_rateidx = -1;
836 /* setup type-dependent data */
837 ieee80211_setup_sdata(sdata, type);
839 ret = register_netdevice(ndev);
843 if (ieee80211_vif_is_mesh(&sdata->vif) &&
844 params && params->mesh_id_len)
845 ieee80211_sdata_set_mesh_id(sdata,
849 mutex_lock(&local->iflist_mtx);
850 list_add_tail_rcu(&sdata->list, &local->interfaces);
851 mutex_unlock(&local->iflist_mtx);
863 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
867 mutex_lock(&sdata->local->iflist_mtx);
868 list_del_rcu(&sdata->list);
869 mutex_unlock(&sdata->local->iflist_mtx);
872 unregister_netdevice(sdata->dev);
876 * Remove all interfaces, may only be called at hardware unregistration
877 * time because it doesn't do RCU-safe list removals.
879 void ieee80211_remove_interfaces(struct ieee80211_local *local)
881 struct ieee80211_sub_if_data *sdata, *tmp;
885 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
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
892 mutex_lock(&local->iflist_mtx);
893 list_del(&sdata->list);
894 mutex_unlock(&local->iflist_mtx);
896 unregister_netdevice(sdata->dev);
900 static u32 ieee80211_idle_off(struct ieee80211_local *local,
903 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
906 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
907 printk(KERN_DEBUG "%s: device no longer idle - %s\n",
908 wiphy_name(local->hw.wiphy), reason);
911 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
912 return IEEE80211_CONF_CHANGE_IDLE;
915 static u32 ieee80211_idle_on(struct ieee80211_local *local)
917 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
920 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
921 printk(KERN_DEBUG "%s: device now idle\n",
922 wiphy_name(local->hw.wiphy));
925 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
926 return IEEE80211_CONF_CHANGE_IDLE;
929 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
931 struct ieee80211_sub_if_data *sdata;
934 if (local->hw_scanning || local->sw_scanning)
935 return ieee80211_idle_off(local, "scanning");
937 list_for_each_entry(sdata, &local->interfaces, list) {
938 if (!netif_running(sdata->dev))
940 /* do not count disabled managed interfaces */
941 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
942 sdata->u.mgd.state == IEEE80211_STA_MLME_DISABLED)
944 /* do not count unused IBSS interfaces */
945 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
946 !sdata->u.ibss.ssid_len)
948 /* count everything else */
953 return ieee80211_idle_on(local);
955 return ieee80211_idle_off(local, "in use");
960 void ieee80211_recalc_idle(struct ieee80211_local *local)
964 mutex_lock(&local->iflist_mtx);
965 chg = __ieee80211_recalc_idle(local);
966 mutex_unlock(&local->iflist_mtx);
968 ieee80211_hw_config(local, chg);