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);
254 res = drv_add_interface(local, &sdata->vif);
258 if (ieee80211_vif_is_mesh(&sdata->vif)) {
259 local->fif_other_bss++;
260 ieee80211_configure_filter(local);
262 ieee80211_start_mesh(sdata);
263 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
266 ieee80211_configure_filter(local);
269 changed |= ieee80211_reset_erp_info(sdata);
270 ieee80211_bss_info_change_notify(sdata, changed);
272 if (sdata->vif.type == NL80211_IFTYPE_STATION)
273 netif_carrier_off(dev);
275 netif_carrier_on(dev);
278 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
279 /* Create STA entry for the WDS peer */
280 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
284 goto err_del_interface;
287 /* no locking required since STA is not live yet */
288 sta->flags |= WLAN_STA_AUTHORIZED;
290 res = sta_info_insert(sta);
292 /* STA has been freed */
293 goto err_del_interface;
298 * set_multicast_list will be invoked by the networking core
299 * which will check whether any increments here were done in
300 * error and sync them down to the hardware as filter flags.
302 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
303 atomic_inc(&local->iff_allmultis);
305 if (sdata->flags & IEEE80211_SDATA_PROMISC)
306 atomic_inc(&local->iff_promiscs);
308 hw_reconf_flags |= __ieee80211_recalc_idle(local);
311 if (hw_reconf_flags) {
312 ieee80211_hw_config(local, hw_reconf_flags);
314 * set default queue parameters so drivers don't
315 * need to initialise the hardware if the hardware
316 * doesn't start up with sane defaults
318 ieee80211_set_wmm_default(sdata);
321 ieee80211_recalc_ps(local, -1);
323 netif_tx_start_all_queues(dev);
327 drv_remove_interface(local, &sdata->vif);
329 if (!local->open_count)
333 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
334 list_del(&sdata->u.vlan.list);
338 static int ieee80211_stop(struct net_device *dev)
340 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
341 struct ieee80211_local *local = sdata->local;
343 struct sk_buff *skb, *tmp;
344 u32 hw_reconf_flags = 0;
348 * Stop TX on this interface first.
350 netif_tx_stop_all_queues(dev);
353 * Purge work for this interface.
355 ieee80211_work_purge(sdata);
358 * Remove all stations associated with this interface.
360 * This must be done before calling ops->remove_interface()
361 * because otherwise we can later invoke ops->sta_notify()
362 * whenever the STAs are removed, and that invalidates driver
363 * assumptions about always getting a vif pointer that is valid
364 * (because if we remove a STA after ops->remove_interface()
365 * the driver will have removed the vif info already!)
367 * We could relax this and only unlink the stations from the
368 * hash table and list but keep them on a per-sdata list that
369 * will be inserted back again when the interface is brought
370 * up again, but I don't currently see a use case for that,
371 * except with WDS which gets a STA entry created when it is
374 sta_info_flush(local, sdata);
377 * Don't count this interface for promisc/allmulti while it
378 * is down. dev_mc_unsync() will invoke set_multicast_list
379 * on the master interface which will sync these down to the
380 * hardware as filter flags.
382 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
383 atomic_dec(&local->iff_allmultis);
385 if (sdata->flags & IEEE80211_SDATA_PROMISC)
386 atomic_dec(&local->iff_promiscs);
388 if (sdata->vif.type == NL80211_IFTYPE_AP)
391 netif_addr_lock_bh(dev);
392 spin_lock_bh(&local->filter_lock);
393 __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
394 spin_unlock_bh(&local->filter_lock);
395 netif_addr_unlock_bh(dev);
397 ieee80211_configure_filter(local);
399 del_timer_sync(&local->dynamic_ps_timer);
400 cancel_work_sync(&local->dynamic_ps_enable_work);
402 /* APs need special treatment */
403 if (sdata->vif.type == NL80211_IFTYPE_AP) {
404 struct ieee80211_sub_if_data *vlan, *tmpsdata;
405 struct beacon_data *old_beacon = sdata->u.ap.beacon;
408 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
412 /* down all dependent devices, that is VLANs */
413 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
415 dev_close(vlan->dev);
416 WARN_ON(!list_empty(&sdata->u.ap.vlans));
421 switch (sdata->vif.type) {
422 case NL80211_IFTYPE_AP_VLAN:
423 list_del(&sdata->u.vlan.list);
424 /* no need to tell driver */
426 case NL80211_IFTYPE_MONITOR:
427 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
428 local->cooked_mntrs--;
433 if (local->monitors == 0) {
434 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
435 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
438 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
439 local->fif_fcsfail--;
440 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
441 local->fif_plcpfail--;
442 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
444 local->fif_control--;
446 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
447 local->fif_other_bss--;
449 ieee80211_configure_filter(local);
451 case NL80211_IFTYPE_STATION:
452 del_timer_sync(&sdata->u.mgd.chswitch_timer);
453 del_timer_sync(&sdata->u.mgd.timer);
454 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
455 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
457 * If any of the timers fired while we waited for it, it will
458 * have queued its work. Now the work will be running again
459 * but will not rearm the timer again because it checks
460 * whether the interface is running, which, at this point,
463 cancel_work_sync(&sdata->u.mgd.chswitch_work);
464 cancel_work_sync(&sdata->u.mgd.monitor_work);
465 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
468 case NL80211_IFTYPE_ADHOC:
469 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
470 del_timer_sync(&sdata->u.ibss.timer);
472 case NL80211_IFTYPE_MESH_POINT:
473 if (ieee80211_vif_is_mesh(&sdata->vif)) {
474 /* other_bss and allmulti are always set on mesh
476 local->fif_other_bss--;
477 atomic_dec(&local->iff_allmultis);
479 ieee80211_configure_filter(local);
481 ieee80211_stop_mesh(sdata);
485 flush_work(&sdata->work);
487 * When we get here, the interface is marked down.
488 * Call synchronize_rcu() to wait for the RX path
489 * should it be using the interface and enqueuing
490 * frames at this very time on another CPU.
493 skb_queue_purge(&sdata->skb_queue);
495 if (local->scan_sdata == sdata)
496 ieee80211_scan_cancel(local);
499 * Disable beaconing for AP and mesh, IBSS can't
500 * still be joined to a network at this point.
502 if (sdata->vif.type == NL80211_IFTYPE_AP ||
503 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
504 ieee80211_bss_info_change_notify(sdata,
505 BSS_CHANGED_BEACON_ENABLED);
508 /* free all remaining keys, there shouldn't be any */
509 ieee80211_free_keys(sdata);
510 drv_remove_interface(local, &sdata->vif);
515 hw_reconf_flags |= __ieee80211_recalc_idle(local);
517 ieee80211_recalc_ps(local, -1);
519 if (local->open_count == 0) {
520 ieee80211_clear_tx_pending(local);
521 ieee80211_stop_device(local);
523 /* no reconfiguring after stop! */
527 /* do after stop to avoid reconfiguring when we stop anyway */
529 ieee80211_hw_config(local, hw_reconf_flags);
531 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
532 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
533 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
534 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
535 if (info->control.vif == &sdata->vif) {
536 __skb_unlink(skb, &local->pending[i]);
537 dev_kfree_skb_irq(skb);
541 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
546 static void ieee80211_set_multicast_list(struct net_device *dev)
548 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
549 struct ieee80211_local *local = sdata->local;
550 int allmulti, promisc, sdata_allmulti, sdata_promisc;
552 allmulti = !!(dev->flags & IFF_ALLMULTI);
553 promisc = !!(dev->flags & IFF_PROMISC);
554 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
555 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
557 if (allmulti != sdata_allmulti) {
558 if (dev->flags & IFF_ALLMULTI)
559 atomic_inc(&local->iff_allmultis);
561 atomic_dec(&local->iff_allmultis);
562 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
565 if (promisc != sdata_promisc) {
566 if (dev->flags & IFF_PROMISC)
567 atomic_inc(&local->iff_promiscs);
569 atomic_dec(&local->iff_promiscs);
570 sdata->flags ^= IEEE80211_SDATA_PROMISC;
572 spin_lock_bh(&local->filter_lock);
573 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
574 spin_unlock_bh(&local->filter_lock);
575 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
579 * Called when the netdev is removed or, by the code below, before
580 * the interface type changes.
582 static void ieee80211_teardown_sdata(struct net_device *dev)
584 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
585 struct ieee80211_local *local = sdata->local;
586 struct beacon_data *beacon;
591 /* free extra data */
592 ieee80211_free_keys(sdata);
594 ieee80211_debugfs_remove_netdev(sdata);
596 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
597 __skb_queue_purge(&sdata->fragments[i].skb_list);
598 sdata->fragment_next = 0;
600 switch (sdata->vif.type) {
601 case NL80211_IFTYPE_AP:
602 beacon = sdata->u.ap.beacon;
603 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
607 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
608 local->total_ps_buffered--;
613 case NL80211_IFTYPE_MESH_POINT:
614 if (ieee80211_vif_is_mesh(&sdata->vif))
615 mesh_rmc_free(sdata);
617 case NL80211_IFTYPE_ADHOC:
618 if (WARN_ON(sdata->u.ibss.presp))
619 kfree_skb(sdata->u.ibss.presp);
621 case NL80211_IFTYPE_STATION:
622 case NL80211_IFTYPE_WDS:
623 case NL80211_IFTYPE_AP_VLAN:
624 case NL80211_IFTYPE_MONITOR:
626 case NL80211_IFTYPE_UNSPECIFIED:
627 case __NL80211_IFTYPE_AFTER_LAST:
632 flushed = sta_info_flush(local, sdata);
636 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
639 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
642 static const struct net_device_ops ieee80211_dataif_ops = {
643 .ndo_open = ieee80211_open,
644 .ndo_stop = ieee80211_stop,
645 .ndo_uninit = ieee80211_teardown_sdata,
646 .ndo_start_xmit = ieee80211_subif_start_xmit,
647 .ndo_set_multicast_list = ieee80211_set_multicast_list,
648 .ndo_change_mtu = ieee80211_change_mtu,
649 .ndo_set_mac_address = ieee80211_change_mac,
650 .ndo_select_queue = ieee80211_netdev_select_queue,
653 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
656 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
657 struct ieee80211_local *local = sdata->local;
658 struct ieee80211_hdr *hdr;
659 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
662 if (local->hw.queues < 4)
666 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
667 return 0; /* doesn't matter, frame will be dropped */
669 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
671 if (!ieee80211_is_data(hdr->frame_control)) {
673 return ieee802_1d_to_ac[skb->priority];
675 if (!ieee80211_is_data_qos(hdr->frame_control)) {
677 return ieee802_1d_to_ac[skb->priority];
680 p = ieee80211_get_qos_ctl(hdr);
681 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
683 return ieee80211_downgrade_queue(local, skb);
686 static const struct net_device_ops ieee80211_monitorif_ops = {
687 .ndo_open = ieee80211_open,
688 .ndo_stop = ieee80211_stop,
689 .ndo_uninit = ieee80211_teardown_sdata,
690 .ndo_start_xmit = ieee80211_monitor_start_xmit,
691 .ndo_set_multicast_list = ieee80211_set_multicast_list,
692 .ndo_change_mtu = ieee80211_change_mtu,
693 .ndo_set_mac_address = eth_mac_addr,
694 .ndo_select_queue = ieee80211_monitor_select_queue,
697 static void ieee80211_if_setup(struct net_device *dev)
700 dev->netdev_ops = &ieee80211_dataif_ops;
701 dev->destructor = free_netdev;
704 static void ieee80211_iface_work(struct work_struct *work)
706 struct ieee80211_sub_if_data *sdata =
707 container_of(work, struct ieee80211_sub_if_data, work);
708 struct ieee80211_local *local = sdata->local;
710 struct sta_info *sta;
711 struct ieee80211_ra_tid *ra_tid;
713 if (!ieee80211_sdata_running(sdata))
720 * ieee80211_queue_work() should have picked up most cases,
721 * here we'll pick the rest.
723 if (WARN(local->suspended,
724 "interface work scheduled while going to suspend\n"))
727 /* first process frames */
728 while ((skb = skb_dequeue(&sdata->skb_queue))) {
729 struct ieee80211_mgmt *mgmt = (void *)skb->data;
731 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
732 ra_tid = (void *)&skb->cb;
733 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
735 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
736 ra_tid = (void *)&skb->cb;
737 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
739 } else if (ieee80211_is_action(mgmt->frame_control) &&
740 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
744 sta = sta_info_get(sdata, mgmt->sa);
746 switch (mgmt->u.action.u.addba_req.action_code) {
747 case WLAN_ACTION_ADDBA_REQ:
748 ieee80211_process_addba_request(
749 local, sta, mgmt, len);
751 case WLAN_ACTION_ADDBA_RESP:
752 ieee80211_process_addba_resp(local, sta,
755 case WLAN_ACTION_DELBA:
756 ieee80211_process_delba(sdata, sta,
765 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
766 struct ieee80211_hdr *hdr = (void *)mgmt;
768 * So the frame isn't mgmt, but frame_control
769 * is at the right place anyway, of course, so
770 * the if statement is correct.
772 * Warn if we have other data frame types here,
773 * they must not get here.
775 WARN_ON(hdr->frame_control &
776 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
777 WARN_ON(!(hdr->seq_ctrl &
778 cpu_to_le16(IEEE80211_SCTL_FRAG)));
780 * This was a fragment of a frame, received while
781 * a block-ack session was active. That cannot be
782 * right, so terminate the session.
785 sta = sta_info_get(sdata, mgmt->sa);
787 u16 tid = *ieee80211_get_qos_ctl(hdr) &
788 IEEE80211_QOS_CTL_TID_MASK;
790 __ieee80211_stop_rx_ba_session(
791 sta, tid, WLAN_BACK_RECIPIENT,
792 WLAN_REASON_QSTA_REQUIRE_SETUP);
795 } else switch (sdata->vif.type) {
796 case NL80211_IFTYPE_STATION:
797 ieee80211_sta_rx_queued_mgmt(sdata, skb);
799 case NL80211_IFTYPE_ADHOC:
800 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
802 case NL80211_IFTYPE_MESH_POINT:
803 if (!ieee80211_vif_is_mesh(&sdata->vif))
805 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
808 WARN(1, "frame for unexpected interface type");
815 /* then other type-dependent work */
816 switch (sdata->vif.type) {
817 case NL80211_IFTYPE_STATION:
818 ieee80211_sta_work(sdata);
820 case NL80211_IFTYPE_ADHOC:
821 ieee80211_ibss_work(sdata);
823 case NL80211_IFTYPE_MESH_POINT:
824 if (!ieee80211_vif_is_mesh(&sdata->vif))
826 ieee80211_mesh_work(sdata);
835 * Helper function to initialise an interface to a specific type.
837 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
838 enum nl80211_iftype type)
840 /* clear type-dependent union */
841 memset(&sdata->u, 0, sizeof(sdata->u));
843 /* and set some type-dependent values */
844 sdata->vif.type = type;
845 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
846 sdata->wdev.iftype = type;
848 /* only monitor differs */
849 sdata->dev->type = ARPHRD_ETHER;
851 skb_queue_head_init(&sdata->skb_queue);
852 INIT_WORK(&sdata->work, ieee80211_iface_work);
855 case NL80211_IFTYPE_AP:
856 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
857 INIT_LIST_HEAD(&sdata->u.ap.vlans);
859 case NL80211_IFTYPE_STATION:
860 ieee80211_sta_setup_sdata(sdata);
862 case NL80211_IFTYPE_ADHOC:
863 ieee80211_ibss_setup_sdata(sdata);
865 case NL80211_IFTYPE_MESH_POINT:
866 if (ieee80211_vif_is_mesh(&sdata->vif))
867 ieee80211_mesh_init_sdata(sdata);
869 case NL80211_IFTYPE_MONITOR:
870 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
871 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
872 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
873 MONITOR_FLAG_OTHER_BSS;
875 case NL80211_IFTYPE_WDS:
876 case NL80211_IFTYPE_AP_VLAN:
878 case NL80211_IFTYPE_UNSPECIFIED:
879 case __NL80211_IFTYPE_AFTER_LAST:
884 ieee80211_debugfs_add_netdev(sdata);
887 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
888 enum nl80211_iftype type)
892 if (type == sdata->vif.type)
895 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
896 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
897 type == NL80211_IFTYPE_ADHOC)
901 * We could, here, on changes between IBSS/STA/MESH modes,
902 * invoke an MLME function instead that disassociates etc.
903 * and goes into the requested mode.
906 if (ieee80211_sdata_running(sdata))
909 /* Purge and reset type-dependent state. */
910 ieee80211_teardown_sdata(sdata->dev);
911 ieee80211_setup_sdata(sdata, type);
913 /* reset some values that shouldn't be kept across type changes */
914 sdata->vif.bss_conf.basic_rates =
915 ieee80211_mandatory_rates(sdata->local,
916 sdata->local->hw.conf.channel->band);
917 sdata->drop_unencrypted = 0;
918 if (type == NL80211_IFTYPE_STATION)
919 sdata->u.mgd.use_4addr = false;
924 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
925 struct net_device *dev,
926 enum nl80211_iftype type)
928 struct ieee80211_sub_if_data *sdata;
929 u64 mask, start, addr, val, inc;
931 u8 tmp_addr[ETH_ALEN];
934 /* default ... something at least */
935 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
937 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
938 local->hw.wiphy->n_addresses <= 1)
942 mutex_lock(&local->iflist_mtx);
945 case NL80211_IFTYPE_MONITOR:
948 case NL80211_IFTYPE_WDS:
949 case NL80211_IFTYPE_AP_VLAN:
950 /* match up with an AP interface */
951 list_for_each_entry(sdata, &local->interfaces, list) {
952 if (sdata->vif.type != NL80211_IFTYPE_AP)
954 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
957 /* keep default if no AP interface present */
960 /* assign a new address if possible -- try n_addresses first */
961 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
964 list_for_each_entry(sdata, &local->interfaces, list) {
965 if (memcmp(local->hw.wiphy->addresses[i].addr,
966 sdata->vif.addr, ETH_ALEN) == 0) {
973 memcpy(dev->perm_addr,
974 local->hw.wiphy->addresses[i].addr,
980 /* try mask if available */
981 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
984 m = local->hw.wiphy->addr_mask;
985 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
986 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
987 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
989 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
990 /* not a contiguous mask ... not handled now! */
991 printk(KERN_DEBUG "not contiguous\n");
995 m = local->hw.wiphy->perm_addr;
996 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
997 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
998 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1000 inc = 1ULL<<__ffs64(mask);
1001 val = (start & mask);
1002 addr = (start & ~mask) | (val & mask);
1006 tmp_addr[5] = addr >> 0*8;
1007 tmp_addr[4] = addr >> 1*8;
1008 tmp_addr[3] = addr >> 2*8;
1009 tmp_addr[2] = addr >> 3*8;
1010 tmp_addr[1] = addr >> 4*8;
1011 tmp_addr[0] = addr >> 5*8;
1015 list_for_each_entry(sdata, &local->interfaces, list) {
1016 if (memcmp(tmp_addr, sdata->vif.addr,
1024 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1027 addr = (start & ~mask) | (val & mask);
1028 } while (addr != start);
1033 mutex_unlock(&local->iflist_mtx);
1036 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1037 struct net_device **new_dev, enum nl80211_iftype type,
1038 struct vif_params *params)
1040 struct net_device *ndev;
1041 struct ieee80211_sub_if_data *sdata = NULL;
1046 ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1047 name, ieee80211_if_setup, local->hw.queues);
1050 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1052 ndev->needed_headroom = local->tx_headroom +
1053 4*6 /* four MAC addresses */
1054 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1056 + 8 /* rfc1042/bridge tunnel */
1057 - ETH_HLEN /* ethernet hard_header_len */
1058 + IEEE80211_ENCRYPT_HEADROOM;
1059 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1061 ret = dev_alloc_name(ndev, ndev->name);
1065 ieee80211_assign_perm_addr(local, ndev, type);
1066 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1067 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1069 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1070 sdata = netdev_priv(ndev);
1071 ndev->ieee80211_ptr = &sdata->wdev;
1072 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1073 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1075 /* initialise type-independent data */
1076 sdata->wdev.wiphy = local->hw.wiphy;
1077 sdata->local = local;
1080 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1081 skb_queue_head_init(&sdata->fragments[i].skb_list);
1083 INIT_LIST_HEAD(&sdata->key_list);
1085 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1086 struct ieee80211_supported_band *sband;
1087 sband = local->hw.wiphy->bands[i];
1088 sdata->rc_rateidx_mask[i] =
1089 sband ? (1 << sband->n_bitrates) - 1 : 0;
1092 /* setup type-dependent data */
1093 ieee80211_setup_sdata(sdata, type);
1096 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1097 if (type == NL80211_IFTYPE_STATION)
1098 sdata->u.mgd.use_4addr = params->use_4addr;
1101 ret = register_netdevice(ndev);
1105 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1106 params && params->mesh_id_len)
1107 ieee80211_sdata_set_mesh_id(sdata,
1108 params->mesh_id_len,
1111 mutex_lock(&local->iflist_mtx);
1112 list_add_tail_rcu(&sdata->list, &local->interfaces);
1113 mutex_unlock(&local->iflist_mtx);
1125 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1129 mutex_lock(&sdata->local->iflist_mtx);
1130 list_del_rcu(&sdata->list);
1131 mutex_unlock(&sdata->local->iflist_mtx);
1134 unregister_netdevice(sdata->dev);
1138 * Remove all interfaces, may only be called at hardware unregistration
1139 * time because it doesn't do RCU-safe list removals.
1141 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1143 struct ieee80211_sub_if_data *sdata, *tmp;
1144 LIST_HEAD(unreg_list);
1148 mutex_lock(&local->iflist_mtx);
1149 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1150 list_del(&sdata->list);
1152 unregister_netdevice_queue(sdata->dev, &unreg_list);
1154 mutex_unlock(&local->iflist_mtx);
1155 unregister_netdevice_many(&unreg_list);
1158 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1161 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1164 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1165 printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1166 wiphy_name(local->hw.wiphy), reason);
1169 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1170 return IEEE80211_CONF_CHANGE_IDLE;
1173 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1175 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1178 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1179 printk(KERN_DEBUG "%s: device now idle\n",
1180 wiphy_name(local->hw.wiphy));
1183 drv_flush(local, false);
1185 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1186 return IEEE80211_CONF_CHANGE_IDLE;
1189 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1191 struct ieee80211_sub_if_data *sdata;
1194 if (!list_empty(&local->work_list))
1195 return ieee80211_idle_off(local, "working");
1197 if (local->scanning)
1198 return ieee80211_idle_off(local, "scanning");
1200 list_for_each_entry(sdata, &local->interfaces, list) {
1201 if (!ieee80211_sdata_running(sdata))
1203 /* do not count disabled managed interfaces */
1204 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1205 !sdata->u.mgd.associated)
1207 /* do not count unused IBSS interfaces */
1208 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1209 !sdata->u.ibss.ssid_len)
1211 /* count everything else */
1216 return ieee80211_idle_on(local);
1218 return ieee80211_idle_off(local, "in use");
1223 void ieee80211_recalc_idle(struct ieee80211_local *local)
1227 mutex_lock(&local->iflist_mtx);
1228 chg = __ieee80211_recalc_idle(local);
1229 mutex_unlock(&local->iflist_mtx);
1231 ieee80211_hw_config(local, chg);
1234 static int netdev_notify(struct notifier_block *nb,
1235 unsigned long state,
1238 struct net_device *dev = ndev;
1239 struct ieee80211_sub_if_data *sdata;
1241 if (state != NETDEV_CHANGENAME)
1244 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1247 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1250 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1252 memcpy(sdata->name, dev->name, IFNAMSIZ);
1254 ieee80211_debugfs_rename_netdev(sdata);
1258 static struct notifier_block mac80211_netdev_notifier = {
1259 .notifier_call = netdev_notify,
1262 int ieee80211_iface_init(void)
1264 return register_netdevice_notifier(&mac80211_netdev_notifier);
1267 void ieee80211_iface_exit(void)
1269 unregister_netdevice_notifier(&mac80211_netdev_notifier);