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/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
22 #include "debugfs_netdev.h"
25 #include "driver-ops.h"
29 * DOC: Interface list locking
31 * The interface list in each struct ieee80211_local is protected
34 * (1) modifications may only be done under the RTNL
35 * (2) modifications and readers are protected against each other by
37 * (3) modifications are done in an RCU manner so atomic readers
38 * can traverse the list in RCU-safe blocks.
40 * As a consequence, reads (traversals) of the list can be protected
41 * by either the RTNL, the iflist_mtx or RCU.
45 static int ieee80211_change_mtu(struct net_device
*dev
, int new_mtu
)
48 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
50 meshhdrlen
= (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
) ? 5 : 0;
52 /* FIX: what would be proper limits for MTU?
53 * This interface uses 802.3 frames. */
55 new_mtu
> IEEE80211_MAX_DATA_LEN
- 24 - 6 - meshhdrlen
) {
59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
60 printk(KERN_DEBUG
"%s: setting MTU %d\n", dev
->name
, new_mtu
);
61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
66 static int ieee80211_change_mac(struct net_device
*dev
, void *addr
)
68 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
69 struct sockaddr
*sa
= addr
;
72 if (ieee80211_sdata_running(sdata
))
75 ret
= eth_mac_addr(dev
, sa
);
78 memcpy(sdata
->vif
.addr
, sa
->sa_data
, ETH_ALEN
);
83 static inline int identical_mac_addr_allowed(int type1
, int type2
)
85 return type1
== NL80211_IFTYPE_MONITOR
||
86 type2
== NL80211_IFTYPE_MONITOR
||
87 (type1
== NL80211_IFTYPE_AP
&& type2
== NL80211_IFTYPE_WDS
) ||
88 (type1
== NL80211_IFTYPE_WDS
&&
89 (type2
== NL80211_IFTYPE_WDS
||
90 type2
== NL80211_IFTYPE_AP
)) ||
91 (type1
== NL80211_IFTYPE_AP
&& type2
== NL80211_IFTYPE_AP_VLAN
) ||
92 (type1
== NL80211_IFTYPE_AP_VLAN
&&
93 (type2
== NL80211_IFTYPE_AP
||
94 type2
== NL80211_IFTYPE_AP_VLAN
));
97 static int ieee80211_open(struct net_device
*dev
)
99 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
100 struct ieee80211_sub_if_data
*nsdata
;
101 struct ieee80211_local
*local
= sdata
->local
;
102 struct sta_info
*sta
;
105 u32 hw_reconf_flags
= 0;
106 u8 null_addr
[ETH_ALEN
] = {0};
108 /* fail early if user set an invalid address */
109 if (compare_ether_addr(dev
->dev_addr
, null_addr
) &&
110 !is_valid_ether_addr(dev
->dev_addr
))
111 return -EADDRNOTAVAIL
;
113 /* we hold the RTNL here so can safely walk the list */
114 list_for_each_entry(nsdata
, &local
->interfaces
, list
) {
115 struct net_device
*ndev
= nsdata
->dev
;
117 if (ndev
!= dev
&& ieee80211_sdata_running(nsdata
)) {
119 * Allow only a single IBSS interface to be up at any
120 * time. This is restricted because beacon distribution
121 * cannot work properly if both are in the same IBSS.
123 * To remove this restriction we'd have to disallow them
124 * from setting the same SSID on different IBSS interfaces
125 * belonging to the same hardware. Then, however, we're
126 * faced with having to adopt two different TSF timers...
128 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
129 nsdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
133 * The remaining checks are only performed for interfaces
134 * with the same MAC address.
136 if (compare_ether_addr(dev
->dev_addr
, ndev
->dev_addr
))
140 * check whether it may have the same address
142 if (!identical_mac_addr_allowed(sdata
->vif
.type
,
147 * can only add VLANs to enabled APs
149 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
150 nsdata
->vif
.type
== NL80211_IFTYPE_AP
)
151 sdata
->bss
= &nsdata
->u
.ap
;
155 switch (sdata
->vif
.type
) {
156 case NL80211_IFTYPE_WDS
:
157 if (!is_valid_ether_addr(sdata
->u
.wds
.remote_addr
))
160 case NL80211_IFTYPE_AP_VLAN
:
163 list_add(&sdata
->u
.vlan
.list
, &sdata
->bss
->vlans
);
165 case NL80211_IFTYPE_AP
:
166 sdata
->bss
= &sdata
->u
.ap
;
168 case NL80211_IFTYPE_MESH_POINT
:
169 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
171 /* mesh ifaces must set allmulti to forward mcast traffic */
172 atomic_inc(&local
->iff_allmultis
);
174 case NL80211_IFTYPE_STATION
:
175 case NL80211_IFTYPE_MONITOR
:
176 case NL80211_IFTYPE_ADHOC
:
177 /* no special treatment */
179 case NL80211_IFTYPE_UNSPECIFIED
:
180 case __NL80211_IFTYPE_AFTER_LAST
:
186 if (local
->open_count
== 0) {
187 res
= drv_start(local
);
190 /* we're brought up, everything changes */
191 hw_reconf_flags
= ~0;
192 ieee80211_led_radio(local
, true);
196 * Check all interfaces and copy the hopefully now-present
197 * MAC address to those that have the special null one.
199 list_for_each_entry(nsdata
, &local
->interfaces
, list
) {
200 struct net_device
*ndev
= nsdata
->dev
;
203 * No need to check running since we do not allow
204 * it to start up with this invalid address.
206 if (compare_ether_addr(null_addr
, ndev
->dev_addr
) == 0) {
207 memcpy(ndev
->dev_addr
,
208 local
->hw
.wiphy
->perm_addr
,
210 memcpy(ndev
->perm_addr
, ndev
->dev_addr
, ETH_ALEN
);
215 * Validate the MAC address for this device.
217 if (!is_valid_ether_addr(dev
->dev_addr
)) {
218 if (!local
->open_count
)
220 return -EADDRNOTAVAIL
;
223 switch (sdata
->vif
.type
) {
224 case NL80211_IFTYPE_AP_VLAN
:
225 /* no need to tell driver */
227 case NL80211_IFTYPE_MONITOR
:
228 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
) {
229 local
->cooked_mntrs
++;
233 /* must be before the call to ieee80211_configure_filter */
235 if (local
->monitors
== 1) {
236 local
->hw
.conf
.flags
|= IEEE80211_CONF_MONITOR
;
237 hw_reconf_flags
|= IEEE80211_CONF_CHANGE_MONITOR
;
240 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_FCSFAIL
)
241 local
->fif_fcsfail
++;
242 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_PLCPFAIL
)
243 local
->fif_plcpfail
++;
244 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_CONTROL
) {
245 local
->fif_control
++;
248 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_OTHER_BSS
)
249 local
->fif_other_bss
++;
251 ieee80211_configure_filter(local
);
253 netif_carrier_on(dev
);
256 res
= drv_add_interface(local
, &sdata
->vif
);
260 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
261 local
->fif_other_bss
++;
262 ieee80211_configure_filter(local
);
264 ieee80211_start_mesh(sdata
);
265 } else if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
268 ieee80211_configure_filter(local
);
271 changed
|= ieee80211_reset_erp_info(sdata
);
272 ieee80211_bss_info_change_notify(sdata
, changed
);
274 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
275 netif_carrier_off(dev
);
277 netif_carrier_on(dev
);
280 if (sdata
->vif
.type
== NL80211_IFTYPE_WDS
) {
281 /* Create STA entry for the WDS peer */
282 sta
= sta_info_alloc(sdata
, sdata
->u
.wds
.remote_addr
,
286 goto err_del_interface
;
289 /* no locking required since STA is not live yet */
290 sta
->flags
|= WLAN_STA_AUTHORIZED
;
292 res
= sta_info_insert(sta
);
294 /* STA has been freed */
295 goto err_del_interface
;
300 * set_multicast_list will be invoked by the networking core
301 * which will check whether any increments here were done in
302 * error and sync them down to the hardware as filter flags.
304 if (sdata
->flags
& IEEE80211_SDATA_ALLMULTI
)
305 atomic_inc(&local
->iff_allmultis
);
307 if (sdata
->flags
& IEEE80211_SDATA_PROMISC
)
308 atomic_inc(&local
->iff_promiscs
);
310 hw_reconf_flags
|= __ieee80211_recalc_idle(local
);
313 if (hw_reconf_flags
) {
314 ieee80211_hw_config(local
, hw_reconf_flags
);
316 * set default queue parameters so drivers don't
317 * need to initialise the hardware if the hardware
318 * doesn't start up with sane defaults
320 ieee80211_set_wmm_default(sdata
);
323 ieee80211_recalc_ps(local
, -1);
325 netif_tx_start_all_queues(dev
);
329 drv_remove_interface(local
, &sdata
->vif
);
331 if (!local
->open_count
)
335 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
336 list_del(&sdata
->u
.vlan
.list
);
340 static int ieee80211_stop(struct net_device
*dev
)
342 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
343 struct ieee80211_local
*local
= sdata
->local
;
345 struct sk_buff
*skb
, *tmp
;
346 u32 hw_reconf_flags
= 0;
350 * Stop TX on this interface first.
352 netif_tx_stop_all_queues(dev
);
355 * Purge work for this interface.
357 ieee80211_work_purge(sdata
);
360 * Remove all stations associated with this interface.
362 * This must be done before calling ops->remove_interface()
363 * because otherwise we can later invoke ops->sta_notify()
364 * whenever the STAs are removed, and that invalidates driver
365 * assumptions about always getting a vif pointer that is valid
366 * (because if we remove a STA after ops->remove_interface()
367 * the driver will have removed the vif info already!)
369 * We could relax this and only unlink the stations from the
370 * hash table and list but keep them on a per-sdata list that
371 * will be inserted back again when the interface is brought
372 * up again, but I don't currently see a use case for that,
373 * except with WDS which gets a STA entry created when it is
376 sta_info_flush(local
, sdata
);
379 * Don't count this interface for promisc/allmulti while it
380 * is down. dev_mc_unsync() will invoke set_multicast_list
381 * on the master interface which will sync these down to the
382 * hardware as filter flags.
384 if (sdata
->flags
& IEEE80211_SDATA_ALLMULTI
)
385 atomic_dec(&local
->iff_allmultis
);
387 if (sdata
->flags
& IEEE80211_SDATA_PROMISC
)
388 atomic_dec(&local
->iff_promiscs
);
390 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
393 netif_addr_lock_bh(dev
);
394 spin_lock_bh(&local
->filter_lock
);
395 __hw_addr_unsync(&local
->mc_list
, &dev
->mc
, dev
->addr_len
);
396 spin_unlock_bh(&local
->filter_lock
);
397 netif_addr_unlock_bh(dev
);
399 ieee80211_configure_filter(local
);
401 del_timer_sync(&local
->dynamic_ps_timer
);
402 cancel_work_sync(&local
->dynamic_ps_enable_work
);
404 /* APs need special treatment */
405 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
406 struct ieee80211_sub_if_data
*vlan
, *tmpsdata
;
407 struct beacon_data
*old_beacon
= sdata
->u
.ap
.beacon
;
410 rcu_assign_pointer(sdata
->u
.ap
.beacon
, NULL
);
414 /* down all dependent devices, that is VLANs */
415 list_for_each_entry_safe(vlan
, tmpsdata
, &sdata
->u
.ap
.vlans
,
417 dev_close(vlan
->dev
);
418 WARN_ON(!list_empty(&sdata
->u
.ap
.vlans
));
423 switch (sdata
->vif
.type
) {
424 case NL80211_IFTYPE_AP_VLAN
:
425 list_del(&sdata
->u
.vlan
.list
);
426 /* no need to tell driver */
428 case NL80211_IFTYPE_MONITOR
:
429 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
) {
430 local
->cooked_mntrs
--;
435 if (local
->monitors
== 0) {
436 local
->hw
.conf
.flags
&= ~IEEE80211_CONF_MONITOR
;
437 hw_reconf_flags
|= IEEE80211_CONF_CHANGE_MONITOR
;
440 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_FCSFAIL
)
441 local
->fif_fcsfail
--;
442 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_PLCPFAIL
)
443 local
->fif_plcpfail
--;
444 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_CONTROL
) {
446 local
->fif_control
--;
448 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_OTHER_BSS
)
449 local
->fif_other_bss
--;
451 ieee80211_configure_filter(local
);
453 case NL80211_IFTYPE_STATION
:
454 del_timer_sync(&sdata
->u
.mgd
.chswitch_timer
);
455 del_timer_sync(&sdata
->u
.mgd
.timer
);
456 del_timer_sync(&sdata
->u
.mgd
.conn_mon_timer
);
457 del_timer_sync(&sdata
->u
.mgd
.bcn_mon_timer
);
459 * If any of the timers fired while we waited for it, it will
460 * have queued its work. Now the work will be running again
461 * but will not rearm the timer again because it checks
462 * whether the interface is running, which, at this point,
465 cancel_work_sync(&sdata
->u
.mgd
.chswitch_work
);
466 cancel_work_sync(&sdata
->u
.mgd
.monitor_work
);
467 cancel_work_sync(&sdata
->u
.mgd
.beacon_connection_loss_work
);
470 case NL80211_IFTYPE_ADHOC
:
471 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
472 del_timer_sync(&sdata
->u
.ibss
.timer
);
474 case NL80211_IFTYPE_MESH_POINT
:
475 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
476 /* other_bss and allmulti are always set on mesh
478 local
->fif_other_bss
--;
479 atomic_dec(&local
->iff_allmultis
);
481 ieee80211_configure_filter(local
);
483 ieee80211_stop_mesh(sdata
);
487 flush_work(&sdata
->work
);
489 * When we get here, the interface is marked down.
490 * Call synchronize_rcu() to wait for the RX path
491 * should it be using the interface and enqueuing
492 * frames at this very time on another CPU.
495 skb_queue_purge(&sdata
->skb_queue
);
497 if (local
->scan_sdata
== sdata
)
498 ieee80211_scan_cancel(local
);
501 * Disable beaconing for AP and mesh, IBSS can't
502 * still be joined to a network at this point.
504 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
505 sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
) {
506 ieee80211_bss_info_change_notify(sdata
,
507 BSS_CHANGED_BEACON_ENABLED
);
510 /* free all remaining keys, there shouldn't be any */
511 ieee80211_free_keys(sdata
);
512 drv_remove_interface(local
, &sdata
->vif
);
517 hw_reconf_flags
|= __ieee80211_recalc_idle(local
);
519 ieee80211_recalc_ps(local
, -1);
521 if (local
->open_count
== 0) {
522 ieee80211_clear_tx_pending(local
);
523 ieee80211_stop_device(local
);
525 /* no reconfiguring after stop! */
529 /* do after stop to avoid reconfiguring when we stop anyway */
531 ieee80211_hw_config(local
, hw_reconf_flags
);
533 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
534 for (i
= 0; i
< IEEE80211_MAX_QUEUES
; i
++) {
535 skb_queue_walk_safe(&local
->pending
[i
], skb
, tmp
) {
536 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
537 if (info
->control
.vif
== &sdata
->vif
) {
538 __skb_unlink(skb
, &local
->pending
[i
]);
539 dev_kfree_skb_irq(skb
);
543 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
548 static void ieee80211_set_multicast_list(struct net_device
*dev
)
550 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
551 struct ieee80211_local
*local
= sdata
->local
;
552 int allmulti
, promisc
, sdata_allmulti
, sdata_promisc
;
554 allmulti
= !!(dev
->flags
& IFF_ALLMULTI
);
555 promisc
= !!(dev
->flags
& IFF_PROMISC
);
556 sdata_allmulti
= !!(sdata
->flags
& IEEE80211_SDATA_ALLMULTI
);
557 sdata_promisc
= !!(sdata
->flags
& IEEE80211_SDATA_PROMISC
);
559 if (allmulti
!= sdata_allmulti
) {
560 if (dev
->flags
& IFF_ALLMULTI
)
561 atomic_inc(&local
->iff_allmultis
);
563 atomic_dec(&local
->iff_allmultis
);
564 sdata
->flags
^= IEEE80211_SDATA_ALLMULTI
;
567 if (promisc
!= sdata_promisc
) {
568 if (dev
->flags
& IFF_PROMISC
)
569 atomic_inc(&local
->iff_promiscs
);
571 atomic_dec(&local
->iff_promiscs
);
572 sdata
->flags
^= IEEE80211_SDATA_PROMISC
;
574 spin_lock_bh(&local
->filter_lock
);
575 __hw_addr_sync(&local
->mc_list
, &dev
->mc
, dev
->addr_len
);
576 spin_unlock_bh(&local
->filter_lock
);
577 ieee80211_queue_work(&local
->hw
, &local
->reconfig_filter
);
581 * Called when the netdev is removed or, by the code below, before
582 * the interface type changes.
584 static void ieee80211_teardown_sdata(struct net_device
*dev
)
586 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
587 struct ieee80211_local
*local
= sdata
->local
;
588 struct beacon_data
*beacon
;
593 /* free extra data */
594 ieee80211_free_keys(sdata
);
596 ieee80211_debugfs_remove_netdev(sdata
);
598 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++)
599 __skb_queue_purge(&sdata
->fragments
[i
].skb_list
);
600 sdata
->fragment_next
= 0;
602 switch (sdata
->vif
.type
) {
603 case NL80211_IFTYPE_AP
:
604 beacon
= sdata
->u
.ap
.beacon
;
605 rcu_assign_pointer(sdata
->u
.ap
.beacon
, NULL
);
609 while ((skb
= skb_dequeue(&sdata
->u
.ap
.ps_bc_buf
))) {
610 local
->total_ps_buffered
--;
615 case NL80211_IFTYPE_MESH_POINT
:
616 if (ieee80211_vif_is_mesh(&sdata
->vif
))
617 mesh_rmc_free(sdata
);
619 case NL80211_IFTYPE_ADHOC
:
620 if (WARN_ON(sdata
->u
.ibss
.presp
))
621 kfree_skb(sdata
->u
.ibss
.presp
);
623 case NL80211_IFTYPE_STATION
:
624 case NL80211_IFTYPE_WDS
:
625 case NL80211_IFTYPE_AP_VLAN
:
626 case NL80211_IFTYPE_MONITOR
:
628 case NL80211_IFTYPE_UNSPECIFIED
:
629 case __NL80211_IFTYPE_AFTER_LAST
:
634 flushed
= sta_info_flush(local
, sdata
);
638 static u16
ieee80211_netdev_select_queue(struct net_device
*dev
,
641 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
644 static const struct net_device_ops ieee80211_dataif_ops
= {
645 .ndo_open
= ieee80211_open
,
646 .ndo_stop
= ieee80211_stop
,
647 .ndo_uninit
= ieee80211_teardown_sdata
,
648 .ndo_start_xmit
= ieee80211_subif_start_xmit
,
649 .ndo_set_multicast_list
= ieee80211_set_multicast_list
,
650 .ndo_change_mtu
= ieee80211_change_mtu
,
651 .ndo_set_mac_address
= ieee80211_change_mac
,
652 .ndo_select_queue
= ieee80211_netdev_select_queue
,
655 static u16
ieee80211_monitor_select_queue(struct net_device
*dev
,
658 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
659 struct ieee80211_local
*local
= sdata
->local
;
660 struct ieee80211_hdr
*hdr
;
661 struct ieee80211_radiotap_header
*rtap
= (void *)skb
->data
;
664 if (local
->hw
.queues
< 4)
668 skb
->len
< le16_to_cpu(rtap
->it_len
) + 2 /* frame control */)
669 return 0; /* doesn't matter, frame will be dropped */
671 hdr
= (void *)((u8
*)skb
->data
+ le16_to_cpu(rtap
->it_len
));
673 if (!ieee80211_is_data(hdr
->frame_control
)) {
675 return ieee802_1d_to_ac
[skb
->priority
];
677 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
679 return ieee802_1d_to_ac
[skb
->priority
];
682 p
= ieee80211_get_qos_ctl(hdr
);
683 skb
->priority
= *p
& IEEE80211_QOS_CTL_TAG1D_MASK
;
685 return ieee80211_downgrade_queue(local
, skb
);
688 static const struct net_device_ops ieee80211_monitorif_ops
= {
689 .ndo_open
= ieee80211_open
,
690 .ndo_stop
= ieee80211_stop
,
691 .ndo_uninit
= ieee80211_teardown_sdata
,
692 .ndo_start_xmit
= ieee80211_monitor_start_xmit
,
693 .ndo_set_multicast_list
= ieee80211_set_multicast_list
,
694 .ndo_change_mtu
= ieee80211_change_mtu
,
695 .ndo_set_mac_address
= eth_mac_addr
,
696 .ndo_select_queue
= ieee80211_monitor_select_queue
,
699 static void ieee80211_if_setup(struct net_device
*dev
)
702 dev
->netdev_ops
= &ieee80211_dataif_ops
;
703 dev
->destructor
= free_netdev
;
706 static void ieee80211_iface_work(struct work_struct
*work
)
708 struct ieee80211_sub_if_data
*sdata
=
709 container_of(work
, struct ieee80211_sub_if_data
, work
);
710 struct ieee80211_local
*local
= sdata
->local
;
712 struct sta_info
*sta
;
713 struct ieee80211_ra_tid
*ra_tid
;
715 if (!ieee80211_sdata_running(sdata
))
722 * ieee80211_queue_work() should have picked up most cases,
723 * here we'll pick the rest.
725 if (WARN(local
->suspended
,
726 "interface work scheduled while going to suspend\n"))
729 /* first process frames */
730 while ((skb
= skb_dequeue(&sdata
->skb_queue
))) {
731 struct ieee80211_mgmt
*mgmt
= (void *)skb
->data
;
733 if (skb
->pkt_type
== IEEE80211_SDATA_QUEUE_AGG_START
) {
734 ra_tid
= (void *)&skb
->cb
;
735 ieee80211_start_tx_ba_cb(&sdata
->vif
, ra_tid
->ra
,
737 } else if (skb
->pkt_type
== IEEE80211_SDATA_QUEUE_AGG_STOP
) {
738 ra_tid
= (void *)&skb
->cb
;
739 ieee80211_stop_tx_ba_cb(&sdata
->vif
, ra_tid
->ra
,
741 } else if (ieee80211_is_action(mgmt
->frame_control
) &&
742 mgmt
->u
.action
.category
== WLAN_CATEGORY_BACK
) {
745 mutex_lock(&local
->sta_mtx
);
746 sta
= sta_info_get_bss(sdata
, mgmt
->sa
);
748 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
749 case WLAN_ACTION_ADDBA_REQ
:
750 ieee80211_process_addba_request(
751 local
, sta
, mgmt
, len
);
753 case WLAN_ACTION_ADDBA_RESP
:
754 ieee80211_process_addba_resp(local
, sta
,
757 case WLAN_ACTION_DELBA
:
758 ieee80211_process_delba(sdata
, sta
,
766 mutex_unlock(&local
->sta_mtx
);
767 } else if (ieee80211_is_data_qos(mgmt
->frame_control
)) {
768 struct ieee80211_hdr
*hdr
= (void *)mgmt
;
770 * So the frame isn't mgmt, but frame_control
771 * is at the right place anyway, of course, so
772 * the if statement is correct.
774 * Warn if we have other data frame types here,
775 * they must not get here.
777 WARN_ON(hdr
->frame_control
&
778 cpu_to_le16(IEEE80211_STYPE_NULLFUNC
));
779 WARN_ON(!(hdr
->seq_ctrl
&
780 cpu_to_le16(IEEE80211_SCTL_FRAG
)));
782 * This was a fragment of a frame, received while
783 * a block-ack session was active. That cannot be
784 * right, so terminate the session.
786 mutex_lock(&local
->sta_mtx
);
787 sta
= sta_info_get_bss(sdata
, mgmt
->sa
);
789 u16 tid
= *ieee80211_get_qos_ctl(hdr
) &
790 IEEE80211_QOS_CTL_TID_MASK
;
792 __ieee80211_stop_rx_ba_session(
793 sta
, tid
, WLAN_BACK_RECIPIENT
,
794 WLAN_REASON_QSTA_REQUIRE_SETUP
);
796 mutex_unlock(&local
->sta_mtx
);
797 } else switch (sdata
->vif
.type
) {
798 case NL80211_IFTYPE_STATION
:
799 ieee80211_sta_rx_queued_mgmt(sdata
, skb
);
801 case NL80211_IFTYPE_ADHOC
:
802 ieee80211_ibss_rx_queued_mgmt(sdata
, skb
);
804 case NL80211_IFTYPE_MESH_POINT
:
805 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
807 ieee80211_mesh_rx_queued_mgmt(sdata
, skb
);
810 WARN(1, "frame for unexpected interface type");
817 /* then other type-dependent work */
818 switch (sdata
->vif
.type
) {
819 case NL80211_IFTYPE_STATION
:
820 ieee80211_sta_work(sdata
);
822 case NL80211_IFTYPE_ADHOC
:
823 ieee80211_ibss_work(sdata
);
825 case NL80211_IFTYPE_MESH_POINT
:
826 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
828 ieee80211_mesh_work(sdata
);
837 * Helper function to initialise an interface to a specific type.
839 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data
*sdata
,
840 enum nl80211_iftype type
)
842 /* clear type-dependent union */
843 memset(&sdata
->u
, 0, sizeof(sdata
->u
));
845 /* and set some type-dependent values */
846 sdata
->vif
.type
= type
;
847 sdata
->dev
->netdev_ops
= &ieee80211_dataif_ops
;
848 sdata
->wdev
.iftype
= type
;
850 /* only monitor differs */
851 sdata
->dev
->type
= ARPHRD_ETHER
;
853 skb_queue_head_init(&sdata
->skb_queue
);
854 INIT_WORK(&sdata
->work
, ieee80211_iface_work
);
857 case NL80211_IFTYPE_AP
:
858 skb_queue_head_init(&sdata
->u
.ap
.ps_bc_buf
);
859 INIT_LIST_HEAD(&sdata
->u
.ap
.vlans
);
861 case NL80211_IFTYPE_STATION
:
862 ieee80211_sta_setup_sdata(sdata
);
864 case NL80211_IFTYPE_ADHOC
:
865 ieee80211_ibss_setup_sdata(sdata
);
867 case NL80211_IFTYPE_MESH_POINT
:
868 if (ieee80211_vif_is_mesh(&sdata
->vif
))
869 ieee80211_mesh_init_sdata(sdata
);
871 case NL80211_IFTYPE_MONITOR
:
872 sdata
->dev
->type
= ARPHRD_IEEE80211_RADIOTAP
;
873 sdata
->dev
->netdev_ops
= &ieee80211_monitorif_ops
;
874 sdata
->u
.mntr_flags
= MONITOR_FLAG_CONTROL
|
875 MONITOR_FLAG_OTHER_BSS
;
877 case NL80211_IFTYPE_WDS
:
878 case NL80211_IFTYPE_AP_VLAN
:
880 case NL80211_IFTYPE_UNSPECIFIED
:
881 case __NL80211_IFTYPE_AFTER_LAST
:
886 ieee80211_debugfs_add_netdev(sdata
);
889 int ieee80211_if_change_type(struct ieee80211_sub_if_data
*sdata
,
890 enum nl80211_iftype type
)
894 if (type
== sdata
->vif
.type
)
897 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
898 if (sdata
->local
->oper_channel
->flags
& IEEE80211_CHAN_NO_IBSS
&&
899 type
== NL80211_IFTYPE_ADHOC
)
903 * We could, here, on changes between IBSS/STA/MESH modes,
904 * invoke an MLME function instead that disassociates etc.
905 * and goes into the requested mode.
908 if (ieee80211_sdata_running(sdata
))
911 /* Purge and reset type-dependent state. */
912 ieee80211_teardown_sdata(sdata
->dev
);
913 ieee80211_setup_sdata(sdata
, type
);
915 /* reset some values that shouldn't be kept across type changes */
916 sdata
->vif
.bss_conf
.basic_rates
=
917 ieee80211_mandatory_rates(sdata
->local
,
918 sdata
->local
->hw
.conf
.channel
->band
);
919 sdata
->drop_unencrypted
= 0;
920 if (type
== NL80211_IFTYPE_STATION
)
921 sdata
->u
.mgd
.use_4addr
= false;
926 static void ieee80211_assign_perm_addr(struct ieee80211_local
*local
,
927 struct net_device
*dev
,
928 enum nl80211_iftype type
)
930 struct ieee80211_sub_if_data
*sdata
;
931 u64 mask
, start
, addr
, val
, inc
;
933 u8 tmp_addr
[ETH_ALEN
];
936 /* default ... something at least */
937 memcpy(dev
->perm_addr
, local
->hw
.wiphy
->perm_addr
, ETH_ALEN
);
939 if (is_zero_ether_addr(local
->hw
.wiphy
->addr_mask
) &&
940 local
->hw
.wiphy
->n_addresses
<= 1)
944 mutex_lock(&local
->iflist_mtx
);
947 case NL80211_IFTYPE_MONITOR
:
950 case NL80211_IFTYPE_WDS
:
951 case NL80211_IFTYPE_AP_VLAN
:
952 /* match up with an AP interface */
953 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
954 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
956 memcpy(dev
->perm_addr
, sdata
->vif
.addr
, ETH_ALEN
);
959 /* keep default if no AP interface present */
962 /* assign a new address if possible -- try n_addresses first */
963 for (i
= 0; i
< local
->hw
.wiphy
->n_addresses
; i
++) {
966 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
967 if (memcmp(local
->hw
.wiphy
->addresses
[i
].addr
,
968 sdata
->vif
.addr
, ETH_ALEN
) == 0) {
975 memcpy(dev
->perm_addr
,
976 local
->hw
.wiphy
->addresses
[i
].addr
,
982 /* try mask if available */
983 if (is_zero_ether_addr(local
->hw
.wiphy
->addr_mask
))
986 m
= local
->hw
.wiphy
->addr_mask
;
987 mask
= ((u64
)m
[0] << 5*8) | ((u64
)m
[1] << 4*8) |
988 ((u64
)m
[2] << 3*8) | ((u64
)m
[3] << 2*8) |
989 ((u64
)m
[4] << 1*8) | ((u64
)m
[5] << 0*8);
991 if (__ffs64(mask
) + hweight64(mask
) != fls64(mask
)) {
992 /* not a contiguous mask ... not handled now! */
993 printk(KERN_DEBUG
"not contiguous\n");
997 m
= local
->hw
.wiphy
->perm_addr
;
998 start
= ((u64
)m
[0] << 5*8) | ((u64
)m
[1] << 4*8) |
999 ((u64
)m
[2] << 3*8) | ((u64
)m
[3] << 2*8) |
1000 ((u64
)m
[4] << 1*8) | ((u64
)m
[5] << 0*8);
1002 inc
= 1ULL<<__ffs64(mask
);
1003 val
= (start
& mask
);
1004 addr
= (start
& ~mask
) | (val
& mask
);
1008 tmp_addr
[5] = addr
>> 0*8;
1009 tmp_addr
[4] = addr
>> 1*8;
1010 tmp_addr
[3] = addr
>> 2*8;
1011 tmp_addr
[2] = addr
>> 3*8;
1012 tmp_addr
[1] = addr
>> 4*8;
1013 tmp_addr
[0] = addr
>> 5*8;
1017 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1018 if (memcmp(tmp_addr
, sdata
->vif
.addr
,
1026 memcpy(dev
->perm_addr
, tmp_addr
, ETH_ALEN
);
1029 addr
= (start
& ~mask
) | (val
& mask
);
1030 } while (addr
!= start
);
1035 mutex_unlock(&local
->iflist_mtx
);
1038 int ieee80211_if_add(struct ieee80211_local
*local
, const char *name
,
1039 struct net_device
**new_dev
, enum nl80211_iftype type
,
1040 struct vif_params
*params
)
1042 struct net_device
*ndev
;
1043 struct ieee80211_sub_if_data
*sdata
= NULL
;
1048 ndev
= alloc_netdev_mq(sizeof(*sdata
) + local
->hw
.vif_data_size
,
1049 name
, ieee80211_if_setup
, local
->hw
.queues
);
1052 dev_net_set(ndev
, wiphy_net(local
->hw
.wiphy
));
1054 ndev
->needed_headroom
= local
->tx_headroom
+
1055 4*6 /* four MAC addresses */
1056 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1058 + 8 /* rfc1042/bridge tunnel */
1059 - ETH_HLEN
/* ethernet hard_header_len */
1060 + IEEE80211_ENCRYPT_HEADROOM
;
1061 ndev
->needed_tailroom
= IEEE80211_ENCRYPT_TAILROOM
;
1063 ret
= dev_alloc_name(ndev
, ndev
->name
);
1067 ieee80211_assign_perm_addr(local
, ndev
, type
);
1068 memcpy(ndev
->dev_addr
, ndev
->perm_addr
, ETH_ALEN
);
1069 SET_NETDEV_DEV(ndev
, wiphy_dev(local
->hw
.wiphy
));
1071 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1072 sdata
= netdev_priv(ndev
);
1073 ndev
->ieee80211_ptr
= &sdata
->wdev
;
1074 memcpy(sdata
->vif
.addr
, ndev
->dev_addr
, ETH_ALEN
);
1075 memcpy(sdata
->name
, ndev
->name
, IFNAMSIZ
);
1077 /* initialise type-independent data */
1078 sdata
->wdev
.wiphy
= local
->hw
.wiphy
;
1079 sdata
->local
= local
;
1082 sdata
->arp_filter_state
= true;
1085 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++)
1086 skb_queue_head_init(&sdata
->fragments
[i
].skb_list
);
1088 INIT_LIST_HEAD(&sdata
->key_list
);
1090 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
1091 struct ieee80211_supported_band
*sband
;
1092 sband
= local
->hw
.wiphy
->bands
[i
];
1093 sdata
->rc_rateidx_mask
[i
] =
1094 sband
? (1 << sband
->n_bitrates
) - 1 : 0;
1097 /* setup type-dependent data */
1098 ieee80211_setup_sdata(sdata
, type
);
1101 ndev
->ieee80211_ptr
->use_4addr
= params
->use_4addr
;
1102 if (type
== NL80211_IFTYPE_STATION
)
1103 sdata
->u
.mgd
.use_4addr
= params
->use_4addr
;
1106 ret
= register_netdevice(ndev
);
1110 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1111 params
&& params
->mesh_id_len
)
1112 ieee80211_sdata_set_mesh_id(sdata
,
1113 params
->mesh_id_len
,
1116 mutex_lock(&local
->iflist_mtx
);
1117 list_add_tail_rcu(&sdata
->list
, &local
->interfaces
);
1118 mutex_unlock(&local
->iflist_mtx
);
1130 void ieee80211_if_remove(struct ieee80211_sub_if_data
*sdata
)
1134 mutex_lock(&sdata
->local
->iflist_mtx
);
1135 list_del_rcu(&sdata
->list
);
1136 mutex_unlock(&sdata
->local
->iflist_mtx
);
1139 unregister_netdevice(sdata
->dev
);
1143 * Remove all interfaces, may only be called at hardware unregistration
1144 * time because it doesn't do RCU-safe list removals.
1146 void ieee80211_remove_interfaces(struct ieee80211_local
*local
)
1148 struct ieee80211_sub_if_data
*sdata
, *tmp
;
1149 LIST_HEAD(unreg_list
);
1153 mutex_lock(&local
->iflist_mtx
);
1154 list_for_each_entry_safe(sdata
, tmp
, &local
->interfaces
, list
) {
1155 list_del(&sdata
->list
);
1157 unregister_netdevice_queue(sdata
->dev
, &unreg_list
);
1159 mutex_unlock(&local
->iflist_mtx
);
1160 unregister_netdevice_many(&unreg_list
);
1163 static u32
ieee80211_idle_off(struct ieee80211_local
*local
,
1166 if (!(local
->hw
.conf
.flags
& IEEE80211_CONF_IDLE
))
1169 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1170 printk(KERN_DEBUG
"%s: device no longer idle - %s\n",
1171 wiphy_name(local
->hw
.wiphy
), reason
);
1174 local
->hw
.conf
.flags
&= ~IEEE80211_CONF_IDLE
;
1175 return IEEE80211_CONF_CHANGE_IDLE
;
1178 static u32
ieee80211_idle_on(struct ieee80211_local
*local
)
1180 if (local
->hw
.conf
.flags
& IEEE80211_CONF_IDLE
)
1183 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1184 printk(KERN_DEBUG
"%s: device now idle\n",
1185 wiphy_name(local
->hw
.wiphy
));
1188 drv_flush(local
, false);
1190 local
->hw
.conf
.flags
|= IEEE80211_CONF_IDLE
;
1191 return IEEE80211_CONF_CHANGE_IDLE
;
1194 u32
__ieee80211_recalc_idle(struct ieee80211_local
*local
)
1196 struct ieee80211_sub_if_data
*sdata
;
1199 if (!list_empty(&local
->work_list
))
1200 return ieee80211_idle_off(local
, "working");
1202 if (local
->scanning
)
1203 return ieee80211_idle_off(local
, "scanning");
1205 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1206 if (!ieee80211_sdata_running(sdata
))
1208 /* do not count disabled managed interfaces */
1209 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1210 !sdata
->u
.mgd
.associated
)
1212 /* do not count unused IBSS interfaces */
1213 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
1214 !sdata
->u
.ibss
.ssid_len
)
1216 /* count everything else */
1221 return ieee80211_idle_on(local
);
1223 return ieee80211_idle_off(local
, "in use");
1228 void ieee80211_recalc_idle(struct ieee80211_local
*local
)
1232 mutex_lock(&local
->iflist_mtx
);
1233 chg
= __ieee80211_recalc_idle(local
);
1234 mutex_unlock(&local
->iflist_mtx
);
1236 ieee80211_hw_config(local
, chg
);
1239 static int netdev_notify(struct notifier_block
*nb
,
1240 unsigned long state
,
1243 struct net_device
*dev
= ndev
;
1244 struct ieee80211_sub_if_data
*sdata
;
1246 if (state
!= NETDEV_CHANGENAME
)
1249 if (!dev
->ieee80211_ptr
|| !dev
->ieee80211_ptr
->wiphy
)
1252 if (dev
->ieee80211_ptr
->wiphy
->privid
!= mac80211_wiphy_privid
)
1255 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1257 memcpy(sdata
->name
, dev
->name
, IFNAMSIZ
);
1259 ieee80211_debugfs_rename_netdev(sdata
);
1263 static struct notifier_block mac80211_netdev_notifier
= {
1264 .notifier_call
= netdev_notify
,
1267 int ieee80211_iface_init(void)
1269 return register_netdevice_notifier(&mac80211_netdev_notifier
);
1272 void ieee80211_iface_exit(void)
1274 unregister_netdevice_notifier(&mac80211_netdev_notifier
);