net: Add DEVTYPE support for Ethernet based devices
[linux-2.6.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling (except master interface)
3  *
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>
8  *
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.
12  */
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"
19 #include "sta_info.h"
20 #include "debugfs_netdev.h"
21 #include "mesh.h"
22 #include "led.h"
23 #include "driver-ops.h"
24
25 /**
26  * DOC: Interface list locking
27  *
28  * The interface list in each struct ieee80211_local is protected
29  * three-fold:
30  *
31  * (1) modifications may only be done under the RTNL
32  * (2) modifications and readers are protected against each other by
33  *     the iflist_mtx.
34  * (3) modifications are done in an RCU manner so atomic readers
35  *     can traverse the list in RCU-safe blocks.
36  *
37  * As a consequence, reads (traversals) of the list can be protected
38  * by either the RTNL, the iflist_mtx or RCU.
39  */
40
41
42 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
43 {
44         int meshhdrlen;
45         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
46
47         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
48
49         /* FIX: what would be proper limits for MTU?
50          * This interface uses 802.3 frames. */
51         if (new_mtu < 256 ||
52             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
53                 return -EINVAL;
54         }
55
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 */
59         dev->mtu = new_mtu;
60         return 0;
61 }
62
63 static inline int identical_mac_addr_allowed(int type1, int type2)
64 {
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));
75 }
76
77 static int ieee80211_open(struct net_device *dev)
78 {
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;
82         struct sta_info *sta;
83         struct ieee80211_if_init_conf conf;
84         u32 changed = 0;
85         int res;
86         u32 hw_reconf_flags = 0;
87         u8 null_addr[ETH_ALEN] = {0};
88
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;
93
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;
97
98                 if (ndev != dev && netif_running(ndev)) {
99                         /*
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.
103                          *
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...
108                          */
109                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
110                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
111                                 return -EBUSY;
112
113                         /*
114                          * The remaining checks are only performed for interfaces
115                          * with the same MAC address.
116                          */
117                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
118                                 continue;
119
120                         /*
121                          * check whether it may have the same address
122                          */
123                         if (!identical_mac_addr_allowed(sdata->vif.type,
124                                                         nsdata->vif.type))
125                                 return -ENOTUNIQ;
126
127                         /*
128                          * can only add VLANs to enabled APs
129                          */
130                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
131                             nsdata->vif.type == NL80211_IFTYPE_AP)
132                                 sdata->bss = &nsdata->u.ap;
133                 }
134         }
135
136         switch (sdata->vif.type) {
137         case NL80211_IFTYPE_WDS:
138                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
139                         return -ENOLINK;
140                 break;
141         case NL80211_IFTYPE_AP_VLAN:
142                 if (!sdata->bss)
143                         return -ENOLINK;
144                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
145                 break;
146         case NL80211_IFTYPE_AP:
147                 sdata->bss = &sdata->u.ap;
148                 break;
149         case NL80211_IFTYPE_MESH_POINT:
150                 if (!ieee80211_vif_is_mesh(&sdata->vif))
151                         break;
152                 /* mesh ifaces must set allmulti to forward mcast traffic */
153                 atomic_inc(&local->iff_allmultis);
154                 break;
155         case NL80211_IFTYPE_STATION:
156         case NL80211_IFTYPE_MONITOR:
157         case NL80211_IFTYPE_ADHOC:
158                 /* no special treatment */
159                 break;
160         case NL80211_IFTYPE_UNSPECIFIED:
161         case __NL80211_IFTYPE_AFTER_LAST:
162                 /* cannot happen */
163                 WARN_ON(1);
164                 break;
165         }
166
167         if (local->open_count == 0) {
168                 res = drv_start(local);
169                 if (res)
170                         goto err_del_bss;
171                 /* we're brought up, everything changes */
172                 hw_reconf_flags = ~0;
173                 ieee80211_led_radio(local, true);
174         }
175
176         /*
177          * Check all interfaces and copy the hopefully now-present
178          * MAC address to those that have the special null one.
179          */
180         list_for_each_entry(nsdata, &local->interfaces, list) {
181                 struct net_device *ndev = nsdata->dev;
182
183                 /*
184                  * No need to check netif_running since we do not allow
185                  * it to start up with this invalid address.
186                  */
187                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
188                         memcpy(ndev->dev_addr,
189                                local->hw.wiphy->perm_addr,
190                                ETH_ALEN);
191         }
192
193         /*
194          * Validate the MAC address for this device.
195          */
196         if (!is_valid_ether_addr(dev->dev_addr)) {
197                 if (!local->open_count)
198                         drv_stop(local);
199                 return -EADDRNOTAVAIL;
200         }
201
202         switch (sdata->vif.type) {
203         case NL80211_IFTYPE_AP_VLAN:
204                 /* no need to tell driver */
205                 break;
206         case NL80211_IFTYPE_MONITOR:
207                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
208                         local->cooked_mntrs++;
209                         break;
210                 }
211
212                 /* must be before the call to ieee80211_configure_filter */
213                 local->monitors++;
214                 if (local->monitors == 1) {
215                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
216                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
217                 }
218
219                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
220                         local->fif_fcsfail++;
221                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
222                         local->fif_plcpfail++;
223                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
224                         local->fif_control++;
225                         local->fif_pspoll++;
226                 }
227                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
228                         local->fif_other_bss++;
229
230                 ieee80211_configure_filter(local);
231                 break;
232         default:
233                 conf.vif = &sdata->vif;
234                 conf.type = sdata->vif.type;
235                 conf.mac_addr = dev->dev_addr;
236                 res = drv_add_interface(local, &conf);
237                 if (res)
238                         goto err_stop;
239
240                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
241                         local->fif_other_bss++;
242                         ieee80211_configure_filter(local);
243
244                         ieee80211_start_mesh(sdata);
245                 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
246                         local->fif_pspoll++;
247
248                         ieee80211_configure_filter(local);
249                 }
250
251                 changed |= ieee80211_reset_erp_info(sdata);
252                 ieee80211_bss_info_change_notify(sdata, changed);
253                 ieee80211_enable_keys(sdata);
254
255                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
256                         netif_carrier_off(dev);
257                 else
258                         netif_carrier_on(dev);
259         }
260
261         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
262                 /* Create STA entry for the WDS peer */
263                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
264                                      GFP_KERNEL);
265                 if (!sta) {
266                         res = -ENOMEM;
267                         goto err_del_interface;
268                 }
269
270                 /* no locking required since STA is not live yet */
271                 sta->flags |= WLAN_STA_AUTHORIZED;
272
273                 res = sta_info_insert(sta);
274                 if (res) {
275                         /* STA has been freed */
276                         goto err_del_interface;
277                 }
278         }
279
280         /*
281          * set_multicast_list will be invoked by the networking core
282          * which will check whether any increments here were done in
283          * error and sync them down to the hardware as filter flags.
284          */
285         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
286                 atomic_inc(&local->iff_allmultis);
287
288         if (sdata->flags & IEEE80211_SDATA_PROMISC)
289                 atomic_inc(&local->iff_promiscs);
290
291         hw_reconf_flags |= __ieee80211_recalc_idle(local);
292
293         local->open_count++;
294         if (hw_reconf_flags) {
295                 ieee80211_hw_config(local, hw_reconf_flags);
296                 /*
297                  * set default queue parameters so drivers don't
298                  * need to initialise the hardware if the hardware
299                  * doesn't start up with sane defaults
300                  */
301                 ieee80211_set_wmm_default(sdata);
302         }
303
304         ieee80211_recalc_ps(local, -1);
305
306         /*
307          * ieee80211_sta_work is disabled while network interface
308          * is down. Therefore, some configuration changes may not
309          * yet be effective. Trigger execution of ieee80211_sta_work
310          * to fix this.
311          */
312         if (sdata->vif.type == NL80211_IFTYPE_STATION)
313                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
314
315         netif_tx_start_all_queues(dev);
316
317         return 0;
318  err_del_interface:
319         drv_remove_interface(local, &conf);
320  err_stop:
321         if (!local->open_count)
322                 drv_stop(local);
323  err_del_bss:
324         sdata->bss = NULL;
325         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
326                 list_del(&sdata->u.vlan.list);
327         return res;
328 }
329
330 static int ieee80211_stop(struct net_device *dev)
331 {
332         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
333         struct ieee80211_local *local = sdata->local;
334         struct ieee80211_if_init_conf conf;
335         struct sta_info *sta;
336         unsigned long flags;
337         struct sk_buff *skb, *tmp;
338         u32 hw_reconf_flags = 0;
339         int i;
340
341         /*
342          * Stop TX on this interface first.
343          */
344         netif_tx_stop_all_queues(dev);
345
346         /*
347          * Now delete all active aggregation sessions.
348          */
349         rcu_read_lock();
350
351         list_for_each_entry_rcu(sta, &local->sta_list, list) {
352                 if (sta->sdata == sdata)
353                         ieee80211_sta_tear_down_BA_sessions(sta);
354         }
355
356         rcu_read_unlock();
357
358         /*
359          * Remove all stations associated with this interface.
360          *
361          * This must be done before calling ops->remove_interface()
362          * because otherwise we can later invoke ops->sta_notify()
363          * whenever the STAs are removed, and that invalidates driver
364          * assumptions about always getting a vif pointer that is valid
365          * (because if we remove a STA after ops->remove_interface()
366          * the driver will have removed the vif info already!)
367          *
368          * We could relax this and only unlink the stations from the
369          * hash table and list but keep them on a per-sdata list that
370          * will be inserted back again when the interface is brought
371          * up again, but I don't currently see a use case for that,
372          * except with WDS which gets a STA entry created when it is
373          * brought up.
374          */
375         sta_info_flush(local, sdata);
376
377         /*
378          * Don't count this interface for promisc/allmulti while it
379          * is down. dev_mc_unsync() will invoke set_multicast_list
380          * on the master interface which will sync these down to the
381          * hardware as filter flags.
382          */
383         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
384                 atomic_dec(&local->iff_allmultis);
385
386         if (sdata->flags & IEEE80211_SDATA_PROMISC)
387                 atomic_dec(&local->iff_promiscs);
388
389         if (sdata->vif.type == NL80211_IFTYPE_AP)
390                 local->fif_pspoll--;
391
392         netif_addr_lock_bh(dev);
393         spin_lock_bh(&local->filter_lock);
394         __dev_addr_unsync(&local->mc_list, &local->mc_count,
395                           &dev->mc_list, &dev->mc_count);
396         spin_unlock_bh(&local->filter_lock);
397         netif_addr_unlock_bh(dev);
398
399         ieee80211_configure_filter(local);
400
401         del_timer_sync(&local->dynamic_ps_timer);
402         cancel_work_sync(&local->dynamic_ps_enable_work);
403
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;
408
409                 /* remove beacon */
410                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
411                 synchronize_rcu();
412                 kfree(old_beacon);
413
414                 /* down all dependent devices, that is VLANs */
415                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
416                                          u.vlan.list)
417                         dev_close(vlan->dev);
418                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
419         }
420
421         local->open_count--;
422
423         switch (sdata->vif.type) {
424         case NL80211_IFTYPE_AP_VLAN:
425                 list_del(&sdata->u.vlan.list);
426                 /* no need to tell driver */
427                 break;
428         case NL80211_IFTYPE_MONITOR:
429                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
430                         local->cooked_mntrs--;
431                         break;
432                 }
433
434                 local->monitors--;
435                 if (local->monitors == 0) {
436                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
437                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
438                 }
439
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) {
445                         local->fif_pspoll--;
446                         local->fif_control--;
447                 }
448                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
449                         local->fif_other_bss--;
450
451                 ieee80211_configure_filter(local);
452                 break;
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);
458                 /*
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,
463                  * it no longer is.
464                  */
465                 cancel_work_sync(&sdata->u.mgd.work);
466                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
467                 cancel_work_sync(&sdata->u.mgd.monitor_work);
468                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
469
470                 /*
471                  * When we get here, the interface is marked down.
472                  * Call synchronize_rcu() to wait for the RX path
473                  * should it be using the interface and enqueuing
474                  * frames at this very time on another CPU.
475                  */
476                 synchronize_rcu();
477                 skb_queue_purge(&sdata->u.mgd.skb_queue);
478                 /* fall through */
479         case NL80211_IFTYPE_ADHOC:
480                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
481                         del_timer_sync(&sdata->u.ibss.timer);
482                         cancel_work_sync(&sdata->u.ibss.work);
483                         synchronize_rcu();
484                         skb_queue_purge(&sdata->u.ibss.skb_queue);
485                 }
486                 /* fall through */
487         case NL80211_IFTYPE_MESH_POINT:
488                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
489                         /* other_bss and allmulti are always set on mesh
490                          * ifaces */
491                         local->fif_other_bss--;
492                         atomic_dec(&local->iff_allmultis);
493
494                         ieee80211_configure_filter(local);
495
496                         ieee80211_stop_mesh(sdata);
497                 }
498                 /* fall through */
499         default:
500                 if (local->scan_sdata == sdata)
501                         ieee80211_scan_cancel(local);
502
503                 /*
504                  * Disable beaconing for AP and mesh, IBSS can't
505                  * still be joined to a network at this point.
506                  */
507                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
508                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
509                         ieee80211_bss_info_change_notify(sdata,
510                                 BSS_CHANGED_BEACON_ENABLED);
511                 }
512
513                 conf.vif = &sdata->vif;
514                 conf.type = sdata->vif.type;
515                 conf.mac_addr = dev->dev_addr;
516                 /* disable all keys for as long as this netdev is down */
517                 ieee80211_disable_keys(sdata);
518                 drv_remove_interface(local, &conf);
519         }
520
521         sdata->bss = NULL;
522
523         hw_reconf_flags |= __ieee80211_recalc_idle(local);
524
525         ieee80211_recalc_ps(local, -1);
526
527         if (local->open_count == 0) {
528                 ieee80211_clear_tx_pending(local);
529                 ieee80211_stop_device(local);
530
531                 /* no reconfiguring after stop! */
532                 hw_reconf_flags = 0;
533         }
534
535         /* do after stop to avoid reconfiguring when we stop anyway */
536         if (hw_reconf_flags)
537                 ieee80211_hw_config(local, hw_reconf_flags);
538
539         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
540         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
541                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
542                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
543                         if (info->control.vif == &sdata->vif) {
544                                 __skb_unlink(skb, &local->pending[i]);
545                                 dev_kfree_skb_irq(skb);
546                         }
547                 }
548         }
549         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
550
551         return 0;
552 }
553
554 static void ieee80211_set_multicast_list(struct net_device *dev)
555 {
556         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
557         struct ieee80211_local *local = sdata->local;
558         int allmulti, promisc, sdata_allmulti, sdata_promisc;
559
560         allmulti = !!(dev->flags & IFF_ALLMULTI);
561         promisc = !!(dev->flags & IFF_PROMISC);
562         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
563         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
564
565         if (allmulti != sdata_allmulti) {
566                 if (dev->flags & IFF_ALLMULTI)
567                         atomic_inc(&local->iff_allmultis);
568                 else
569                         atomic_dec(&local->iff_allmultis);
570                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
571         }
572
573         if (promisc != sdata_promisc) {
574                 if (dev->flags & IFF_PROMISC)
575                         atomic_inc(&local->iff_promiscs);
576                 else
577                         atomic_dec(&local->iff_promiscs);
578                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
579         }
580         spin_lock_bh(&local->filter_lock);
581         __dev_addr_sync(&local->mc_list, &local->mc_count,
582                         &dev->mc_list, &dev->mc_count);
583         spin_unlock_bh(&local->filter_lock);
584         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
585 }
586
587 /*
588  * Called when the netdev is removed or, by the code below, before
589  * the interface type changes.
590  */
591 static void ieee80211_teardown_sdata(struct net_device *dev)
592 {
593         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
594         struct ieee80211_local *local = sdata->local;
595         struct beacon_data *beacon;
596         struct sk_buff *skb;
597         int flushed;
598         int i;
599
600         /* free extra data */
601         ieee80211_free_keys(sdata);
602
603         ieee80211_debugfs_remove_netdev(sdata);
604
605         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
606                 __skb_queue_purge(&sdata->fragments[i].skb_list);
607         sdata->fragment_next = 0;
608
609         switch (sdata->vif.type) {
610         case NL80211_IFTYPE_AP:
611                 beacon = sdata->u.ap.beacon;
612                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
613                 synchronize_rcu();
614                 kfree(beacon);
615
616                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
617                         local->total_ps_buffered--;
618                         dev_kfree_skb(skb);
619                 }
620
621                 break;
622         case NL80211_IFTYPE_MESH_POINT:
623                 if (ieee80211_vif_is_mesh(&sdata->vif))
624                         mesh_rmc_free(sdata);
625                 break;
626         case NL80211_IFTYPE_ADHOC:
627                 if (WARN_ON(sdata->u.ibss.presp))
628                         kfree_skb(sdata->u.ibss.presp);
629                 break;
630         case NL80211_IFTYPE_STATION:
631         case NL80211_IFTYPE_WDS:
632         case NL80211_IFTYPE_AP_VLAN:
633         case NL80211_IFTYPE_MONITOR:
634                 break;
635         case NL80211_IFTYPE_UNSPECIFIED:
636         case __NL80211_IFTYPE_AFTER_LAST:
637                 BUG();
638                 break;
639         }
640
641         flushed = sta_info_flush(local, sdata);
642         WARN_ON(flushed);
643 }
644
645 static const struct net_device_ops ieee80211_dataif_ops = {
646         .ndo_open               = ieee80211_open,
647         .ndo_stop               = ieee80211_stop,
648         .ndo_uninit             = ieee80211_teardown_sdata,
649         .ndo_start_xmit         = ieee80211_subif_start_xmit,
650         .ndo_set_multicast_list = ieee80211_set_multicast_list,
651         .ndo_change_mtu         = ieee80211_change_mtu,
652         .ndo_set_mac_address    = eth_mac_addr,
653 };
654
655 static const struct net_device_ops ieee80211_monitorif_ops = {
656         .ndo_open               = ieee80211_open,
657         .ndo_stop               = ieee80211_stop,
658         .ndo_uninit             = ieee80211_teardown_sdata,
659         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
660         .ndo_set_multicast_list = ieee80211_set_multicast_list,
661         .ndo_change_mtu         = ieee80211_change_mtu,
662         .ndo_set_mac_address    = eth_mac_addr,
663 };
664
665 static void ieee80211_if_setup(struct net_device *dev)
666 {
667         ether_setup(dev);
668         dev->netdev_ops = &ieee80211_dataif_ops;
669         dev->destructor = free_netdev;
670 }
671
672 /*
673  * Helper function to initialise an interface to a specific type.
674  */
675 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
676                                   enum nl80211_iftype type)
677 {
678         /* clear type-dependent union */
679         memset(&sdata->u, 0, sizeof(sdata->u));
680
681         /* and set some type-dependent values */
682         sdata->vif.type = type;
683         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
684         sdata->wdev.iftype = type;
685
686         /* only monitor differs */
687         sdata->dev->type = ARPHRD_ETHER;
688
689         switch (type) {
690         case NL80211_IFTYPE_AP:
691                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
692                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
693                 break;
694         case NL80211_IFTYPE_STATION:
695                 ieee80211_sta_setup_sdata(sdata);
696                 break;
697         case NL80211_IFTYPE_ADHOC:
698                 ieee80211_ibss_setup_sdata(sdata);
699                 break;
700         case NL80211_IFTYPE_MESH_POINT:
701                 if (ieee80211_vif_is_mesh(&sdata->vif))
702                         ieee80211_mesh_init_sdata(sdata);
703                 break;
704         case NL80211_IFTYPE_MONITOR:
705                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
706                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
707                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
708                                       MONITOR_FLAG_OTHER_BSS;
709                 break;
710         case NL80211_IFTYPE_WDS:
711         case NL80211_IFTYPE_AP_VLAN:
712                 break;
713         case NL80211_IFTYPE_UNSPECIFIED:
714         case __NL80211_IFTYPE_AFTER_LAST:
715                 BUG();
716                 break;
717         }
718
719         ieee80211_debugfs_add_netdev(sdata);
720 }
721
722 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
723                              enum nl80211_iftype type)
724 {
725         ASSERT_RTNL();
726
727         if (type == sdata->vif.type)
728                 return 0;
729
730         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
731         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
732             type == NL80211_IFTYPE_ADHOC)
733                 return -EOPNOTSUPP;
734
735         /*
736          * We could, here, on changes between IBSS/STA/MESH modes,
737          * invoke an MLME function instead that disassociates etc.
738          * and goes into the requested mode.
739          */
740
741         if (netif_running(sdata->dev))
742                 return -EBUSY;
743
744         /* Purge and reset type-dependent state. */
745         ieee80211_teardown_sdata(sdata->dev);
746         ieee80211_setup_sdata(sdata, type);
747
748         /* reset some values that shouldn't be kept across type changes */
749         sdata->vif.bss_conf.basic_rates =
750                 ieee80211_mandatory_rates(sdata->local,
751                         sdata->local->hw.conf.channel->band);
752         sdata->drop_unencrypted = 0;
753
754         return 0;
755 }
756
757 static struct device_type wiphy_type = {
758         .name   = "wlan",
759 };
760
761 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
762                      struct net_device **new_dev, enum nl80211_iftype type,
763                      struct vif_params *params)
764 {
765         struct net_device *ndev;
766         struct ieee80211_sub_if_data *sdata = NULL;
767         int ret, i;
768
769         ASSERT_RTNL();
770
771         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
772                             name, ieee80211_if_setup);
773         if (!ndev)
774                 return -ENOMEM;
775         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
776
777         ndev->needed_headroom = local->tx_headroom +
778                                 4*6 /* four MAC addresses */
779                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
780                                 + 6 /* mesh */
781                                 + 8 /* rfc1042/bridge tunnel */
782                                 - ETH_HLEN /* ethernet hard_header_len */
783                                 + IEEE80211_ENCRYPT_HEADROOM;
784         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
785
786         ret = dev_alloc_name(ndev, ndev->name);
787         if (ret < 0)
788                 goto fail;
789
790         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
791         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
792         SET_NETDEV_DEVTYPE(ndev, &wiphy_type);
793
794         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
795         sdata = netdev_priv(ndev);
796         ndev->ieee80211_ptr = &sdata->wdev;
797
798         /* initialise type-independent data */
799         sdata->wdev.wiphy = local->hw.wiphy;
800         sdata->local = local;
801         sdata->dev = ndev;
802
803         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
804                 skb_queue_head_init(&sdata->fragments[i].skb_list);
805
806         INIT_LIST_HEAD(&sdata->key_list);
807
808         sdata->force_unicast_rateidx = -1;
809         sdata->max_ratectrl_rateidx = -1;
810
811         /* setup type-dependent data */
812         ieee80211_setup_sdata(sdata, type);
813
814         ret = register_netdevice(ndev);
815         if (ret)
816                 goto fail;
817
818         if (ieee80211_vif_is_mesh(&sdata->vif) &&
819             params && params->mesh_id_len)
820                 ieee80211_sdata_set_mesh_id(sdata,
821                                             params->mesh_id_len,
822                                             params->mesh_id);
823
824         mutex_lock(&local->iflist_mtx);
825         list_add_tail_rcu(&sdata->list, &local->interfaces);
826         mutex_unlock(&local->iflist_mtx);
827
828         if (new_dev)
829                 *new_dev = ndev;
830
831         return 0;
832
833  fail:
834         free_netdev(ndev);
835         return ret;
836 }
837
838 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
839 {
840         ASSERT_RTNL();
841
842         mutex_lock(&sdata->local->iflist_mtx);
843         list_del_rcu(&sdata->list);
844         mutex_unlock(&sdata->local->iflist_mtx);
845
846         synchronize_rcu();
847         unregister_netdevice(sdata->dev);
848 }
849
850 /*
851  * Remove all interfaces, may only be called at hardware unregistration
852  * time because it doesn't do RCU-safe list removals.
853  */
854 void ieee80211_remove_interfaces(struct ieee80211_local *local)
855 {
856         struct ieee80211_sub_if_data *sdata, *tmp;
857
858         ASSERT_RTNL();
859
860         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
861                 /*
862                  * we cannot hold the iflist_mtx across unregister_netdevice,
863                  * but we only need to hold it for list modifications to lock
864                  * out readers since we're under the RTNL here as all other
865                  * writers.
866                  */
867                 mutex_lock(&local->iflist_mtx);
868                 list_del(&sdata->list);
869                 mutex_unlock(&local->iflist_mtx);
870
871                 unregister_netdevice(sdata->dev);
872         }
873 }
874
875 static u32 ieee80211_idle_off(struct ieee80211_local *local,
876                               const char *reason)
877 {
878         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
879                 return 0;
880
881 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
882         printk(KERN_DEBUG "%s: device no longer idle - %s\n",
883                wiphy_name(local->hw.wiphy), reason);
884 #endif
885
886         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
887         return IEEE80211_CONF_CHANGE_IDLE;
888 }
889
890 static u32 ieee80211_idle_on(struct ieee80211_local *local)
891 {
892         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
893                 return 0;
894
895 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
896         printk(KERN_DEBUG "%s: device now idle\n",
897                wiphy_name(local->hw.wiphy));
898 #endif
899
900         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
901         return IEEE80211_CONF_CHANGE_IDLE;
902 }
903
904 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
905 {
906         struct ieee80211_sub_if_data *sdata;
907         int count = 0;
908
909         if (local->scanning)
910                 return ieee80211_idle_off(local, "scanning");
911
912         list_for_each_entry(sdata, &local->interfaces, list) {
913                 if (!netif_running(sdata->dev))
914                         continue;
915                 /* do not count disabled managed interfaces */
916                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
917                     !sdata->u.mgd.associated &&
918                     list_empty(&sdata->u.mgd.work_list))
919                         continue;
920                 /* do not count unused IBSS interfaces */
921                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
922                     !sdata->u.ibss.ssid_len)
923                         continue;
924                 /* count everything else */
925                 count++;
926         }
927
928         if (!count)
929                 return ieee80211_idle_on(local);
930         else
931                 return ieee80211_idle_off(local, "in use");
932
933         return 0;
934 }
935
936 void ieee80211_recalc_idle(struct ieee80211_local *local)
937 {
938         u32 chg;
939
940         mutex_lock(&local->iflist_mtx);
941         chg = __ieee80211_recalc_idle(local);
942         mutex_unlock(&local->iflist_mtx);
943         if (chg)
944                 ieee80211_hw_config(local, chg);
945 }