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 case NL80211_IFTYPE_ADHOC
:
239 sdata
->u
.sta
.flags
&= ~IEEE80211_STA_PREV_BSSID_SET
;
242 conf
.vif
= &sdata
->vif
;
243 conf
.type
= sdata
->vif
.type
;
244 conf
.mac_addr
= dev
->dev_addr
;
245 res
= local
->ops
->add_interface(local_to_hw(local
), &conf
);
249 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
250 local
->fif_other_bss
++;
251 netif_addr_lock_bh(local
->mdev
);
252 ieee80211_configure_filter(local
);
253 netif_addr_unlock_bh(local
->mdev
);
255 ieee80211_start_mesh(sdata
);
257 changed
|= ieee80211_reset_erp_info(sdata
);
258 ieee80211_bss_info_change_notify(sdata
, changed
);
259 ieee80211_enable_keys(sdata
);
261 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
262 !(sdata
->flags
& IEEE80211_SDATA_USERSPACE_MLME
))
263 netif_carrier_off(dev
);
265 netif_carrier_on(dev
);
268 if (sdata
->vif
.type
== NL80211_IFTYPE_WDS
) {
269 /* Create STA entry for the WDS peer */
270 sta
= sta_info_alloc(sdata
, sdata
->u
.wds
.remote_addr
,
274 goto err_del_interface
;
277 /* no locking required since STA is not live yet */
278 sta
->flags
|= WLAN_STA_AUTHORIZED
;
280 res
= sta_info_insert(sta
);
282 /* STA has been freed */
283 goto err_del_interface
;
287 if (local
->open_count
== 0) {
288 res
= dev_open(local
->mdev
);
291 goto err_del_interface
;
292 tasklet_enable(&local
->tx_pending_tasklet
);
293 tasklet_enable(&local
->tasklet
);
297 * set_multicast_list will be invoked by the networking core
298 * which will check whether any increments here were done in
299 * error and sync them down to the hardware as filter flags.
301 if (sdata
->flags
& IEEE80211_SDATA_ALLMULTI
)
302 atomic_inc(&local
->iff_allmultis
);
304 if (sdata
->flags
& IEEE80211_SDATA_PROMISC
)
305 atomic_inc(&local
->iff_promiscs
);
308 if (hw_reconf_flags
) {
309 ieee80211_hw_config(local
, hw_reconf_flags
);
311 * set default queue parameters so drivers don't
312 * need to initialise the hardware if the hardware
313 * doesn't start up with sane defaults
315 ieee80211_set_wmm_default(sdata
);
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 sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
326 struct ieee80211_if_sta
*ifsta
= &sdata
->u
.sta
;
327 queue_work(local
->hw
.workqueue
, &ifsta
->work
);
330 netif_tx_start_all_queues(dev
);
334 local
->ops
->remove_interface(local_to_hw(local
), &conf
);
336 if (!local
->open_count
&& local
->ops
->stop
)
337 local
->ops
->stop(local_to_hw(local
));
340 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
341 list_del(&sdata
->u
.vlan
.list
);
345 static int ieee80211_stop(struct net_device
*dev
)
347 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
348 struct ieee80211_local
*local
= sdata
->local
;
349 struct ieee80211_if_init_conf conf
;
350 struct sta_info
*sta
;
351 u32 hw_reconf_flags
= 0;
354 * Stop TX on this interface first.
356 netif_tx_stop_all_queues(dev
);
359 * Now delete all active aggregation sessions.
363 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
364 if (sta
->sdata
== sdata
)
365 ieee80211_sta_tear_down_BA_sessions(sdata
,
372 * Remove all stations associated with this interface.
374 * This must be done before calling ops->remove_interface()
375 * because otherwise we can later invoke ops->sta_notify()
376 * whenever the STAs are removed, and that invalidates driver
377 * assumptions about always getting a vif pointer that is valid
378 * (because if we remove a STA after ops->remove_interface()
379 * the driver will have removed the vif info already!)
381 * We could relax this and only unlink the stations from the
382 * hash table and list but keep them on a per-sdata list that
383 * will be inserted back again when the interface is brought
384 * up again, but I don't currently see a use case for that,
385 * except with WDS which gets a STA entry created when it is
388 sta_info_flush(local
, sdata
);
391 * Don't count this interface for promisc/allmulti while it
392 * is down. dev_mc_unsync() will invoke set_multicast_list
393 * on the master interface which will sync these down to the
394 * hardware as filter flags.
396 if (sdata
->flags
& IEEE80211_SDATA_ALLMULTI
)
397 atomic_dec(&local
->iff_allmultis
);
399 if (sdata
->flags
& IEEE80211_SDATA_PROMISC
)
400 atomic_dec(&local
->iff_promiscs
);
402 dev_mc_unsync(local
->mdev
, dev
);
403 del_timer_sync(&local
->dynamic_ps_timer
);
404 cancel_work_sync(&local
->dynamic_ps_enable_work
);
406 /* APs need special treatment */
407 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
408 struct ieee80211_sub_if_data
*vlan
, *tmp
;
409 struct beacon_data
*old_beacon
= sdata
->u
.ap
.beacon
;
412 rcu_assign_pointer(sdata
->u
.ap
.beacon
, NULL
);
416 /* down all dependent devices, that is VLANs */
417 list_for_each_entry_safe(vlan
, tmp
, &sdata
->u
.ap
.vlans
,
419 dev_close(vlan
->dev
);
420 WARN_ON(!list_empty(&sdata
->u
.ap
.vlans
));
425 switch (sdata
->vif
.type
) {
426 case NL80211_IFTYPE_AP_VLAN
:
427 list_del(&sdata
->u
.vlan
.list
);
428 /* no need to tell driver */
430 case NL80211_IFTYPE_MONITOR
:
431 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
) {
432 local
->cooked_mntrs
--;
437 if (local
->monitors
== 0) {
438 local
->hw
.conf
.flags
&= ~IEEE80211_CONF_RADIOTAP
;
439 hw_reconf_flags
|= IEEE80211_CONF_CHANGE_RADIOTAP
;
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_control
--;
448 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_OTHER_BSS
)
449 local
->fif_other_bss
--;
451 netif_addr_lock_bh(local
->mdev
);
452 ieee80211_configure_filter(local
);
453 netif_addr_unlock_bh(local
->mdev
);
455 case NL80211_IFTYPE_STATION
:
456 case NL80211_IFTYPE_ADHOC
:
457 /* Announce that we are leaving the network. */
458 if (sdata
->u
.sta
.state
!= IEEE80211_STA_MLME_DISABLED
)
459 ieee80211_sta_deauthenticate(sdata
,
460 WLAN_REASON_DEAUTH_LEAVING
);
462 memset(sdata
->u
.sta
.bssid
, 0, ETH_ALEN
);
463 del_timer_sync(&sdata
->u
.sta
.chswitch_timer
);
464 del_timer_sync(&sdata
->u
.sta
.timer
);
466 * If the timer fired while we waited for it, it will have
467 * requeued the work. Now the work will be running again
468 * but will not rearm the timer again because it checks
469 * whether the interface is running, which, at this point,
472 cancel_work_sync(&sdata
->u
.sta
.work
);
473 cancel_work_sync(&sdata
->u
.sta
.chswitch_work
);
475 * When we get here, the interface is marked down.
476 * Call synchronize_rcu() to wait for the RX path
477 * should it be using the interface and enqueuing
478 * frames at this very time on another CPU.
481 skb_queue_purge(&sdata
->u
.sta
.skb_queue
);
483 sdata
->u
.sta
.flags
&= ~(IEEE80211_STA_PRIVACY_INVOKED
|
484 IEEE80211_STA_TKIP_WEP_USED
);
485 kfree(sdata
->u
.sta
.extra_ie
);
486 sdata
->u
.sta
.extra_ie
= NULL
;
487 sdata
->u
.sta
.extra_ie_len
= 0;
489 case NL80211_IFTYPE_MESH_POINT
:
490 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
491 /* other_bss and allmulti are always set on mesh
493 local
->fif_other_bss
--;
494 atomic_dec(&local
->iff_allmultis
);
496 netif_addr_lock_bh(local
->mdev
);
497 ieee80211_configure_filter(local
);
498 netif_addr_unlock_bh(local
->mdev
);
500 ieee80211_stop_mesh(sdata
);
504 if (local
->scan_sdata
== sdata
) {
505 if (!local
->ops
->hw_scan
)
506 cancel_delayed_work_sync(&local
->scan_work
);
508 * The software scan can no longer run now, so we can
509 * clear out the scan_sdata reference. However, the
510 * hardware scan may still be running. The complete
511 * function must be prepared to handle a NULL value.
513 local
->scan_sdata
= NULL
;
515 * The memory barrier guarantees that another CPU
516 * that is hardware-scanning will now see the fact
517 * that this interface is gone.
521 * If software scanning, complete the scan but since
522 * the scan_sdata is NULL already don't send out a
523 * scan event to userspace -- the scan is incomplete.
525 if (local
->sw_scanning
)
526 ieee80211_scan_completed(&local
->hw
);
529 conf
.vif
= &sdata
->vif
;
530 conf
.type
= sdata
->vif
.type
;
531 conf
.mac_addr
= dev
->dev_addr
;
532 /* disable all keys for as long as this netdev is down */
533 ieee80211_disable_keys(sdata
);
534 local
->ops
->remove_interface(local_to_hw(local
), &conf
);
539 if (local
->open_count
== 0) {
540 if (netif_running(local
->mdev
))
541 dev_close(local
->mdev
);
543 if (local
->ops
->stop
)
544 local
->ops
->stop(local_to_hw(local
));
546 ieee80211_led_radio(local
, 0);
548 flush_workqueue(local
->hw
.workqueue
);
550 tasklet_disable(&local
->tx_pending_tasklet
);
551 tasklet_disable(&local
->tasklet
);
553 /* no reconfiguring after stop! */
557 /* do after stop to avoid reconfiguring when we stop anyway */
559 ieee80211_hw_config(local
, hw_reconf_flags
);
564 static void ieee80211_set_multicast_list(struct net_device
*dev
)
566 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
567 struct ieee80211_local
*local
= sdata
->local
;
568 int allmulti
, promisc
, sdata_allmulti
, sdata_promisc
;
570 allmulti
= !!(dev
->flags
& IFF_ALLMULTI
);
571 promisc
= !!(dev
->flags
& IFF_PROMISC
);
572 sdata_allmulti
= !!(sdata
->flags
& IEEE80211_SDATA_ALLMULTI
);
573 sdata_promisc
= !!(sdata
->flags
& IEEE80211_SDATA_PROMISC
);
575 if (allmulti
!= sdata_allmulti
) {
576 if (dev
->flags
& IFF_ALLMULTI
)
577 atomic_inc(&local
->iff_allmultis
);
579 atomic_dec(&local
->iff_allmultis
);
580 sdata
->flags
^= IEEE80211_SDATA_ALLMULTI
;
583 if (promisc
!= sdata_promisc
) {
584 if (dev
->flags
& IFF_PROMISC
)
585 atomic_inc(&local
->iff_promiscs
);
587 atomic_dec(&local
->iff_promiscs
);
588 sdata
->flags
^= IEEE80211_SDATA_PROMISC
;
591 dev_mc_sync(local
->mdev
, dev
);
595 * Called when the netdev is removed or, by the code below, before
596 * the interface type changes.
598 static void ieee80211_teardown_sdata(struct net_device
*dev
)
600 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
601 struct ieee80211_local
*local
= sdata
->local
;
602 struct beacon_data
*beacon
;
607 /* free extra data */
608 ieee80211_free_keys(sdata
);
610 ieee80211_debugfs_remove_netdev(sdata
);
612 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++)
613 __skb_queue_purge(&sdata
->fragments
[i
].skb_list
);
614 sdata
->fragment_next
= 0;
616 switch (sdata
->vif
.type
) {
617 case NL80211_IFTYPE_AP
:
618 beacon
= sdata
->u
.ap
.beacon
;
619 rcu_assign_pointer(sdata
->u
.ap
.beacon
, NULL
);
623 while ((skb
= skb_dequeue(&sdata
->u
.ap
.ps_bc_buf
))) {
624 local
->total_ps_buffered
--;
629 case NL80211_IFTYPE_MESH_POINT
:
630 if (ieee80211_vif_is_mesh(&sdata
->vif
))
631 mesh_rmc_free(sdata
);
633 case NL80211_IFTYPE_STATION
:
634 case NL80211_IFTYPE_ADHOC
:
635 kfree(sdata
->u
.sta
.extra_ie
);
636 kfree(sdata
->u
.sta
.assocreq_ies
);
637 kfree(sdata
->u
.sta
.assocresp_ies
);
638 kfree_skb(sdata
->u
.sta
.probe_resp
);
639 kfree(sdata
->u
.sta
.ie_probereq
);
640 kfree(sdata
->u
.sta
.ie_proberesp
);
641 kfree(sdata
->u
.sta
.ie_auth
);
642 kfree(sdata
->u
.sta
.ie_assocreq
);
643 kfree(sdata
->u
.sta
.ie_reassocreq
);
644 kfree(sdata
->u
.sta
.ie_deauth
);
645 kfree(sdata
->u
.sta
.ie_disassoc
);
647 case NL80211_IFTYPE_WDS
:
648 case NL80211_IFTYPE_AP_VLAN
:
649 case NL80211_IFTYPE_MONITOR
:
651 case NL80211_IFTYPE_UNSPECIFIED
:
652 case __NL80211_IFTYPE_AFTER_LAST
:
657 flushed
= sta_info_flush(local
, sdata
);
661 static const struct net_device_ops ieee80211_dataif_ops
= {
662 .ndo_open
= ieee80211_open
,
663 .ndo_stop
= ieee80211_stop
,
664 .ndo_uninit
= ieee80211_teardown_sdata
,
665 .ndo_start_xmit
= ieee80211_subif_start_xmit
,
666 .ndo_set_multicast_list
= ieee80211_set_multicast_list
,
667 .ndo_change_mtu
= ieee80211_change_mtu
,
668 .ndo_set_mac_address
= eth_mac_addr
,
671 static const struct net_device_ops ieee80211_monitorif_ops
= {
672 .ndo_open
= ieee80211_open
,
673 .ndo_stop
= ieee80211_stop
,
674 .ndo_uninit
= ieee80211_teardown_sdata
,
675 .ndo_start_xmit
= ieee80211_monitor_start_xmit
,
676 .ndo_set_multicast_list
= ieee80211_set_multicast_list
,
677 .ndo_change_mtu
= ieee80211_change_mtu
,
678 .ndo_set_mac_address
= eth_mac_addr
,
681 static void ieee80211_if_setup(struct net_device
*dev
)
684 dev
->netdev_ops
= &ieee80211_dataif_ops
;
685 dev
->wireless_handlers
= &ieee80211_iw_handler_def
;
686 dev
->destructor
= free_netdev
;
690 * Helper function to initialise an interface to a specific type.
692 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data
*sdata
,
693 enum nl80211_iftype type
)
695 /* clear type-dependent union */
696 memset(&sdata
->u
, 0, sizeof(sdata
->u
));
698 /* and set some type-dependent values */
699 sdata
->vif
.type
= type
;
700 sdata
->dev
->netdev_ops
= &ieee80211_dataif_ops
;
701 sdata
->wdev
.iftype
= type
;
703 /* only monitor differs */
704 sdata
->dev
->type
= ARPHRD_ETHER
;
707 case NL80211_IFTYPE_AP
:
708 skb_queue_head_init(&sdata
->u
.ap
.ps_bc_buf
);
709 INIT_LIST_HEAD(&sdata
->u
.ap
.vlans
);
711 case NL80211_IFTYPE_STATION
:
712 case NL80211_IFTYPE_ADHOC
:
713 ieee80211_sta_setup_sdata(sdata
);
715 case NL80211_IFTYPE_MESH_POINT
:
716 if (ieee80211_vif_is_mesh(&sdata
->vif
))
717 ieee80211_mesh_init_sdata(sdata
);
719 case NL80211_IFTYPE_MONITOR
:
720 sdata
->dev
->type
= ARPHRD_IEEE80211_RADIOTAP
;
721 sdata
->dev
->netdev_ops
= &ieee80211_monitorif_ops
;
722 sdata
->u
.mntr_flags
= MONITOR_FLAG_CONTROL
|
723 MONITOR_FLAG_OTHER_BSS
;
725 case NL80211_IFTYPE_WDS
:
726 case NL80211_IFTYPE_AP_VLAN
:
728 case NL80211_IFTYPE_UNSPECIFIED
:
729 case __NL80211_IFTYPE_AFTER_LAST
:
734 ieee80211_debugfs_add_netdev(sdata
);
737 int ieee80211_if_change_type(struct ieee80211_sub_if_data
*sdata
,
738 enum nl80211_iftype type
)
742 if (type
== sdata
->vif
.type
)
745 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
746 if (sdata
->local
->oper_channel
->flags
& IEEE80211_CHAN_NO_IBSS
&&
747 type
== NL80211_IFTYPE_ADHOC
)
751 * We could, here, on changes between IBSS/STA/MESH modes,
752 * invoke an MLME function instead that disassociates etc.
753 * and goes into the requested mode.
756 if (netif_running(sdata
->dev
))
759 /* Purge and reset type-dependent state. */
760 ieee80211_teardown_sdata(sdata
->dev
);
761 ieee80211_setup_sdata(sdata
, type
);
763 /* reset some values that shouldn't be kept across type changes */
764 sdata
->vif
.bss_conf
.basic_rates
=
765 ieee80211_mandatory_rates(sdata
->local
,
766 sdata
->local
->hw
.conf
.channel
->band
);
767 sdata
->drop_unencrypted
= 0;
772 int ieee80211_if_add(struct ieee80211_local
*local
, const char *name
,
773 struct net_device
**new_dev
, enum nl80211_iftype type
,
774 struct vif_params
*params
)
776 struct net_device
*ndev
;
777 struct ieee80211_sub_if_data
*sdata
= NULL
;
782 ndev
= alloc_netdev(sizeof(*sdata
) + local
->hw
.vif_data_size
,
783 name
, ieee80211_if_setup
);
787 ndev
->needed_headroom
= local
->tx_headroom
+
788 4*6 /* four MAC addresses */
789 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
791 + 8 /* rfc1042/bridge tunnel */
792 - ETH_HLEN
/* ethernet hard_header_len */
793 + IEEE80211_ENCRYPT_HEADROOM
;
794 ndev
->needed_tailroom
= IEEE80211_ENCRYPT_TAILROOM
;
796 ret
= dev_alloc_name(ndev
, ndev
->name
);
800 memcpy(ndev
->dev_addr
, local
->hw
.wiphy
->perm_addr
, ETH_ALEN
);
801 SET_NETDEV_DEV(ndev
, wiphy_dev(local
->hw
.wiphy
));
803 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
804 sdata
= netdev_priv(ndev
);
805 ndev
->ieee80211_ptr
= &sdata
->wdev
;
807 /* initialise type-independent data */
808 sdata
->wdev
.wiphy
= local
->hw
.wiphy
;
809 sdata
->local
= local
;
812 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++)
813 skb_queue_head_init(&sdata
->fragments
[i
].skb_list
);
815 INIT_LIST_HEAD(&sdata
->key_list
);
817 sdata
->force_unicast_rateidx
= -1;
818 sdata
->max_ratectrl_rateidx
= -1;
820 /* setup type-dependent data */
821 ieee80211_setup_sdata(sdata
, type
);
823 ret
= register_netdevice(ndev
);
827 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
828 params
&& params
->mesh_id_len
)
829 ieee80211_sdata_set_mesh_id(sdata
,
833 mutex_lock(&local
->iflist_mtx
);
834 list_add_tail_rcu(&sdata
->list
, &local
->interfaces
);
835 mutex_unlock(&local
->iflist_mtx
);
847 void ieee80211_if_remove(struct ieee80211_sub_if_data
*sdata
)
851 mutex_lock(&sdata
->local
->iflist_mtx
);
852 list_del_rcu(&sdata
->list
);
853 mutex_unlock(&sdata
->local
->iflist_mtx
);
856 unregister_netdevice(sdata
->dev
);
860 * Remove all interfaces, may only be called at hardware unregistration
861 * time because it doesn't do RCU-safe list removals.
863 void ieee80211_remove_interfaces(struct ieee80211_local
*local
)
865 struct ieee80211_sub_if_data
*sdata
, *tmp
;
869 list_for_each_entry_safe(sdata
, tmp
, &local
->interfaces
, list
) {
871 * we cannot hold the iflist_mtx across unregister_netdevice,
872 * but we only need to hold it for list modifications to lock
873 * out readers since we're under the RTNL here as all other
876 mutex_lock(&local
->iflist_mtx
);
877 list_del(&sdata
->list
);
878 mutex_unlock(&local
->iflist_mtx
);
880 unregister_netdevice(sdata
->dev
);