mac80211: move regular interface handling
[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
24 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
25 {
26         int meshhdrlen;
27         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
28
29         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
30
31         /* FIX: what would be proper limits for MTU?
32          * This interface uses 802.3 frames. */
33         if (new_mtu < 256 ||
34             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
35                 return -EINVAL;
36         }
37
38 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
39         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
40 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
41         dev->mtu = new_mtu;
42         return 0;
43 }
44
45 static inline int identical_mac_addr_allowed(int type1, int type2)
46 {
47         return type1 == NL80211_IFTYPE_MONITOR ||
48                 type2 == NL80211_IFTYPE_MONITOR ||
49                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
50                 (type1 == NL80211_IFTYPE_WDS &&
51                         (type2 == NL80211_IFTYPE_WDS ||
52                          type2 == NL80211_IFTYPE_AP)) ||
53                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
54                 (type1 == NL80211_IFTYPE_AP_VLAN &&
55                         (type2 == NL80211_IFTYPE_AP ||
56                          type2 == NL80211_IFTYPE_AP_VLAN));
57 }
58
59 static int ieee80211_open(struct net_device *dev)
60 {
61         struct ieee80211_sub_if_data *sdata, *nsdata;
62         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
63         struct sta_info *sta;
64         struct ieee80211_if_init_conf conf;
65         u32 changed = 0;
66         int res;
67         bool need_hw_reconfig = 0;
68         u8 null_addr[ETH_ALEN] = {0};
69
70         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
71
72         /* fail early if user set an invalid address */
73         if (compare_ether_addr(dev->dev_addr, null_addr) &&
74             !is_valid_ether_addr(dev->dev_addr))
75                 return -EADDRNOTAVAIL;
76
77         /* we hold the RTNL here so can safely walk the list */
78         list_for_each_entry(nsdata, &local->interfaces, list) {
79                 struct net_device *ndev = nsdata->dev;
80
81                 if (ndev != dev && netif_running(ndev)) {
82                         /*
83                          * Allow only a single IBSS interface to be up at any
84                          * time. This is restricted because beacon distribution
85                          * cannot work properly if both are in the same IBSS.
86                          *
87                          * To remove this restriction we'd have to disallow them
88                          * from setting the same SSID on different IBSS interfaces
89                          * belonging to the same hardware. Then, however, we're
90                          * faced with having to adopt two different TSF timers...
91                          */
92                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
93                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
94                                 return -EBUSY;
95
96                         /*
97                          * The remaining checks are only performed for interfaces
98                          * with the same MAC address.
99                          */
100                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
101                                 continue;
102
103                         /*
104                          * check whether it may have the same address
105                          */
106                         if (!identical_mac_addr_allowed(sdata->vif.type,
107                                                         nsdata->vif.type))
108                                 return -ENOTUNIQ;
109
110                         /*
111                          * can only add VLANs to enabled APs
112                          */
113                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
114                             nsdata->vif.type == NL80211_IFTYPE_AP)
115                                 sdata->bss = &nsdata->u.ap;
116                 }
117         }
118
119         switch (sdata->vif.type) {
120         case NL80211_IFTYPE_WDS:
121                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
122                         return -ENOLINK;
123                 break;
124         case NL80211_IFTYPE_AP_VLAN:
125                 if (!sdata->bss)
126                         return -ENOLINK;
127                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
128                 break;
129         case NL80211_IFTYPE_AP:
130                 sdata->bss = &sdata->u.ap;
131                 break;
132         case NL80211_IFTYPE_MESH_POINT:
133                 if (!ieee80211_vif_is_mesh(&sdata->vif))
134                         break;
135                 /* mesh ifaces must set allmulti to forward mcast traffic */
136                 atomic_inc(&local->iff_allmultis);
137                 break;
138         case NL80211_IFTYPE_STATION:
139         case NL80211_IFTYPE_MONITOR:
140         case NL80211_IFTYPE_ADHOC:
141                 /* no special treatment */
142                 break;
143         case NL80211_IFTYPE_UNSPECIFIED:
144         case __NL80211_IFTYPE_AFTER_LAST:
145                 /* cannot happen */
146                 WARN_ON(1);
147                 break;
148         }
149
150         if (local->open_count == 0) {
151                 res = 0;
152                 if (local->ops->start)
153                         res = local->ops->start(local_to_hw(local));
154                 if (res)
155                         goto err_del_bss;
156                 need_hw_reconfig = 1;
157                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
158         }
159
160         /*
161          * Check all interfaces and copy the hopefully now-present
162          * MAC address to those that have the special null one.
163          */
164         list_for_each_entry(nsdata, &local->interfaces, list) {
165                 struct net_device *ndev = nsdata->dev;
166
167                 /*
168                  * No need to check netif_running since we do not allow
169                  * it to start up with this invalid address.
170                  */
171                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
172                         memcpy(ndev->dev_addr,
173                                local->hw.wiphy->perm_addr,
174                                ETH_ALEN);
175         }
176
177         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
178                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
179                        ETH_ALEN);
180
181         /*
182          * Validate the MAC address for this device.
183          */
184         if (!is_valid_ether_addr(dev->dev_addr)) {
185                 if (!local->open_count && local->ops->stop)
186                         local->ops->stop(local_to_hw(local));
187                 return -EADDRNOTAVAIL;
188         }
189
190         switch (sdata->vif.type) {
191         case NL80211_IFTYPE_AP_VLAN:
192                 /* no need to tell driver */
193                 break;
194         case NL80211_IFTYPE_MONITOR:
195                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
196                         local->cooked_mntrs++;
197                         break;
198                 }
199
200                 /* must be before the call to ieee80211_configure_filter */
201                 local->monitors++;
202                 if (local->monitors == 1)
203                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
204
205                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
206                         local->fif_fcsfail++;
207                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
208                         local->fif_plcpfail++;
209                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
210                         local->fif_control++;
211                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
212                         local->fif_other_bss++;
213
214                 netif_addr_lock_bh(local->mdev);
215                 ieee80211_configure_filter(local);
216                 netif_addr_unlock_bh(local->mdev);
217                 break;
218         case NL80211_IFTYPE_STATION:
219         case NL80211_IFTYPE_ADHOC:
220                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
221                 /* fall through */
222         default:
223                 conf.vif = &sdata->vif;
224                 conf.type = sdata->vif.type;
225                 conf.mac_addr = dev->dev_addr;
226                 res = local->ops->add_interface(local_to_hw(local), &conf);
227                 if (res)
228                         goto err_stop;
229
230                 if (ieee80211_vif_is_mesh(&sdata->vif))
231                         ieee80211_start_mesh(sdata);
232                 changed |= ieee80211_reset_erp_info(sdata);
233                 ieee80211_bss_info_change_notify(sdata, changed);
234                 ieee80211_enable_keys(sdata);
235
236                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
237                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
238                         netif_carrier_off(dev);
239                 else
240                         netif_carrier_on(dev);
241         }
242
243         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
244                 /* Create STA entry for the WDS peer */
245                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
246                                      GFP_KERNEL);
247                 if (!sta) {
248                         res = -ENOMEM;
249                         goto err_del_interface;
250                 }
251
252                 /* no locking required since STA is not live yet */
253                 sta->flags |= WLAN_STA_AUTHORIZED;
254
255                 res = sta_info_insert(sta);
256                 if (res) {
257                         /* STA has been freed */
258                         goto err_del_interface;
259                 }
260         }
261
262         if (local->open_count == 0) {
263                 res = dev_open(local->mdev);
264                 WARN_ON(res);
265                 if (res)
266                         goto err_del_interface;
267                 tasklet_enable(&local->tx_pending_tasklet);
268                 tasklet_enable(&local->tasklet);
269         }
270
271         /*
272          * set_multicast_list will be invoked by the networking core
273          * which will check whether any increments here were done in
274          * error and sync them down to the hardware as filter flags.
275          */
276         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
277                 atomic_inc(&local->iff_allmultis);
278
279         if (sdata->flags & IEEE80211_SDATA_PROMISC)
280                 atomic_inc(&local->iff_promiscs);
281
282         local->open_count++;
283         if (need_hw_reconfig) {
284                 ieee80211_hw_config(local);
285                 /*
286                  * set default queue parameters so drivers don't
287                  * need to initialise the hardware if the hardware
288                  * doesn't start up with sane defaults
289                  */
290                 ieee80211_set_wmm_default(sdata);
291         }
292
293         /*
294          * ieee80211_sta_work is disabled while network interface
295          * is down. Therefore, some configuration changes may not
296          * yet be effective. Trigger execution of ieee80211_sta_work
297          * to fix this.
298          */
299         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
300             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
301                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
302                 queue_work(local->hw.workqueue, &ifsta->work);
303         }
304
305         netif_tx_start_all_queues(dev);
306
307         return 0;
308  err_del_interface:
309         local->ops->remove_interface(local_to_hw(local), &conf);
310  err_stop:
311         if (!local->open_count && local->ops->stop)
312                 local->ops->stop(local_to_hw(local));
313  err_del_bss:
314         sdata->bss = NULL;
315         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
316                 list_del(&sdata->u.vlan.list);
317         return res;
318 }
319
320 static int ieee80211_stop(struct net_device *dev)
321 {
322         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
323         struct ieee80211_local *local = sdata->local;
324         struct ieee80211_if_init_conf conf;
325         struct sta_info *sta;
326
327         /*
328          * Stop TX on this interface first.
329          */
330         netif_tx_stop_all_queues(dev);
331
332         /*
333          * Now delete all active aggregation sessions.
334          */
335         rcu_read_lock();
336
337         list_for_each_entry_rcu(sta, &local->sta_list, list) {
338                 if (sta->sdata == sdata)
339                         ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
340         }
341
342         rcu_read_unlock();
343
344         /*
345          * Remove all stations associated with this interface.
346          *
347          * This must be done before calling ops->remove_interface()
348          * because otherwise we can later invoke ops->sta_notify()
349          * whenever the STAs are removed, and that invalidates driver
350          * assumptions about always getting a vif pointer that is valid
351          * (because if we remove a STA after ops->remove_interface()
352          * the driver will have removed the vif info already!)
353          *
354          * We could relax this and only unlink the stations from the
355          * hash table and list but keep them on a per-sdata list that
356          * will be inserted back again when the interface is brought
357          * up again, but I don't currently see a use case for that,
358          * except with WDS which gets a STA entry created when it is
359          * brought up.
360          */
361         sta_info_flush(local, sdata);
362
363         /*
364          * Don't count this interface for promisc/allmulti while it
365          * is down. dev_mc_unsync() will invoke set_multicast_list
366          * on the master interface which will sync these down to the
367          * hardware as filter flags.
368          */
369         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
370                 atomic_dec(&local->iff_allmultis);
371
372         if (sdata->flags & IEEE80211_SDATA_PROMISC)
373                 atomic_dec(&local->iff_promiscs);
374
375         dev_mc_unsync(local->mdev, dev);
376
377         /* APs need special treatment */
378         if (sdata->vif.type == NL80211_IFTYPE_AP) {
379                 struct ieee80211_sub_if_data *vlan, *tmp;
380                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
381
382                 /* remove beacon */
383                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
384                 synchronize_rcu();
385                 kfree(old_beacon);
386
387                 /* down all dependent devices, that is VLANs */
388                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
389                                          u.vlan.list)
390                         dev_close(vlan->dev);
391                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
392         }
393
394         local->open_count--;
395
396         switch (sdata->vif.type) {
397         case NL80211_IFTYPE_AP_VLAN:
398                 list_del(&sdata->u.vlan.list);
399                 /* no need to tell driver */
400                 break;
401         case NL80211_IFTYPE_MONITOR:
402                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
403                         local->cooked_mntrs--;
404                         break;
405                 }
406
407                 local->monitors--;
408                 if (local->monitors == 0)
409                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
410
411                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
412                         local->fif_fcsfail--;
413                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
414                         local->fif_plcpfail--;
415                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
416                         local->fif_control--;
417                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
418                         local->fif_other_bss--;
419
420                 netif_addr_lock_bh(local->mdev);
421                 ieee80211_configure_filter(local);
422                 netif_addr_unlock_bh(local->mdev);
423                 break;
424         case NL80211_IFTYPE_STATION:
425         case NL80211_IFTYPE_ADHOC:
426                 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
427                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
428                 del_timer_sync(&sdata->u.sta.timer);
429                 /*
430                  * If the timer fired while we waited for it, it will have
431                  * requeued the work. Now the work will be running again
432                  * but will not rearm the timer again because it checks
433                  * whether the interface is running, which, at this point,
434                  * it no longer is.
435                  */
436                 cancel_work_sync(&sdata->u.sta.work);
437                 /*
438                  * When we get here, the interface is marked down.
439                  * Call synchronize_rcu() to wait for the RX path
440                  * should it be using the interface and enqueuing
441                  * frames at this very time on another CPU.
442                  */
443                 synchronize_rcu();
444                 skb_queue_purge(&sdata->u.sta.skb_queue);
445
446                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
447                 kfree(sdata->u.sta.extra_ie);
448                 sdata->u.sta.extra_ie = NULL;
449                 sdata->u.sta.extra_ie_len = 0;
450                 /* fall through */
451         case NL80211_IFTYPE_MESH_POINT:
452                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
453                         /* allmulti is always set on mesh ifaces */
454                         atomic_dec(&local->iff_allmultis);
455                         ieee80211_stop_mesh(sdata);
456                 }
457                 /* fall through */
458         default:
459                 if (local->scan_sdata == sdata) {
460                         if (!local->ops->hw_scan)
461                                 cancel_delayed_work_sync(&local->scan_work);
462                         /*
463                          * The software scan can no longer run now, so we can
464                          * clear out the scan_sdata reference. However, the
465                          * hardware scan may still be running. The complete
466                          * function must be prepared to handle a NULL value.
467                          */
468                         local->scan_sdata = NULL;
469                         /*
470                          * The memory barrier guarantees that another CPU
471                          * that is hardware-scanning will now see the fact
472                          * that this interface is gone.
473                          */
474                         smp_mb();
475                         /*
476                          * If software scanning, complete the scan but since
477                          * the scan_sdata is NULL already don't send out a
478                          * scan event to userspace -- the scan is incomplete.
479                          */
480                         if (local->sw_scanning)
481                                 ieee80211_scan_completed(&local->hw);
482                 }
483
484                 conf.vif = &sdata->vif;
485                 conf.type = sdata->vif.type;
486                 conf.mac_addr = dev->dev_addr;
487                 /* disable all keys for as long as this netdev is down */
488                 ieee80211_disable_keys(sdata);
489                 local->ops->remove_interface(local_to_hw(local), &conf);
490         }
491
492         sdata->bss = NULL;
493
494         if (local->open_count == 0) {
495                 if (netif_running(local->mdev))
496                         dev_close(local->mdev);
497
498                 if (local->ops->stop)
499                         local->ops->stop(local_to_hw(local));
500
501                 ieee80211_led_radio(local, 0);
502
503                 flush_workqueue(local->hw.workqueue);
504
505                 tasklet_disable(&local->tx_pending_tasklet);
506                 tasklet_disable(&local->tasklet);
507         }
508
509         return 0;
510 }
511
512 static void ieee80211_set_multicast_list(struct net_device *dev)
513 {
514         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
515         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
516         int allmulti, promisc, sdata_allmulti, sdata_promisc;
517
518         allmulti = !!(dev->flags & IFF_ALLMULTI);
519         promisc = !!(dev->flags & IFF_PROMISC);
520         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
521         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
522
523         if (allmulti != sdata_allmulti) {
524                 if (dev->flags & IFF_ALLMULTI)
525                         atomic_inc(&local->iff_allmultis);
526                 else
527                         atomic_dec(&local->iff_allmultis);
528                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
529         }
530
531         if (promisc != sdata_promisc) {
532                 if (dev->flags & IFF_PROMISC)
533                         atomic_inc(&local->iff_promiscs);
534                 else
535                         atomic_dec(&local->iff_promiscs);
536                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
537         }
538
539         dev_mc_sync(local->mdev, dev);
540 }
541
542 static void ieee80211_if_setup(struct net_device *dev)
543 {
544         ether_setup(dev);
545         dev->hard_start_xmit = ieee80211_subif_start_xmit;
546         dev->wireless_handlers = &ieee80211_iw_handler_def;
547         dev->set_multicast_list = ieee80211_set_multicast_list;
548         dev->change_mtu = ieee80211_change_mtu;
549         dev->open = ieee80211_open;
550         dev->stop = ieee80211_stop;
551         dev->destructor = free_netdev;
552         /* we will validate the address ourselves in ->open */
553         dev->validate_addr = NULL;
554 }
555 /*
556  * Called when the netdev is removed or, by the code below, before
557  * the interface type changes.
558  */
559 static void ieee80211_teardown_sdata(struct net_device *dev)
560 {
561         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
562         struct ieee80211_local *local = sdata->local;
563         struct beacon_data *beacon;
564         struct sk_buff *skb;
565         int flushed;
566         int i;
567
568         /* free extra data */
569         ieee80211_free_keys(sdata);
570
571         ieee80211_debugfs_remove_netdev(sdata);
572
573         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
574                 __skb_queue_purge(&sdata->fragments[i].skb_list);
575         sdata->fragment_next = 0;
576
577         switch (sdata->vif.type) {
578         case NL80211_IFTYPE_AP:
579                 beacon = sdata->u.ap.beacon;
580                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
581                 synchronize_rcu();
582                 kfree(beacon);
583
584                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
585                         local->total_ps_buffered--;
586                         dev_kfree_skb(skb);
587                 }
588
589                 break;
590         case NL80211_IFTYPE_MESH_POINT:
591                 if (ieee80211_vif_is_mesh(&sdata->vif))
592                         mesh_rmc_free(sdata);
593                 break;
594         case NL80211_IFTYPE_STATION:
595         case NL80211_IFTYPE_ADHOC:
596                 kfree(sdata->u.sta.extra_ie);
597                 kfree(sdata->u.sta.assocreq_ies);
598                 kfree(sdata->u.sta.assocresp_ies);
599                 kfree_skb(sdata->u.sta.probe_resp);
600                 break;
601         case NL80211_IFTYPE_WDS:
602         case NL80211_IFTYPE_AP_VLAN:
603         case NL80211_IFTYPE_MONITOR:
604                 break;
605         case NL80211_IFTYPE_UNSPECIFIED:
606         case __NL80211_IFTYPE_AFTER_LAST:
607                 BUG();
608                 break;
609         }
610
611         flushed = sta_info_flush(local, sdata);
612         WARN_ON(flushed);
613 }
614
615 /*
616  * Helper function to initialise an interface to a specific type.
617  */
618 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
619                                   enum nl80211_iftype type)
620 {
621         /* clear type-dependent union */
622         memset(&sdata->u, 0, sizeof(sdata->u));
623
624         /* and set some type-dependent values */
625         sdata->vif.type = type;
626
627         /* only monitor differs */
628         sdata->dev->type = ARPHRD_ETHER;
629
630         switch (type) {
631         case NL80211_IFTYPE_AP:
632                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
633                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
634                 break;
635         case NL80211_IFTYPE_STATION:
636         case NL80211_IFTYPE_ADHOC:
637                 ieee80211_sta_setup_sdata(sdata);
638                 break;
639         case NL80211_IFTYPE_MESH_POINT:
640                 if (ieee80211_vif_is_mesh(&sdata->vif))
641                         ieee80211_mesh_init_sdata(sdata);
642                 break;
643         case NL80211_IFTYPE_MONITOR:
644                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
645                 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
646                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
647                                       MONITOR_FLAG_OTHER_BSS;
648                 break;
649         case NL80211_IFTYPE_WDS:
650         case NL80211_IFTYPE_AP_VLAN:
651                 break;
652         case NL80211_IFTYPE_UNSPECIFIED:
653         case __NL80211_IFTYPE_AFTER_LAST:
654                 BUG();
655                 break;
656         }
657
658         ieee80211_debugfs_add_netdev(sdata);
659 }
660
661 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
662                              enum nl80211_iftype type)
663 {
664         ASSERT_RTNL();
665
666         if (type == sdata->vif.type)
667                 return 0;
668
669         /*
670          * We could, here, on changes between IBSS/STA/MESH modes,
671          * invoke an MLME function instead that disassociates etc.
672          * and goes into the requested mode.
673          */
674
675         if (netif_running(sdata->dev))
676                 return -EBUSY;
677
678         /* Purge and reset type-dependent state. */
679         ieee80211_teardown_sdata(sdata->dev);
680         ieee80211_setup_sdata(sdata, type);
681
682         /* reset some values that shouldn't be kept across type changes */
683         sdata->bss_conf.basic_rates =
684                 ieee80211_mandatory_rates(sdata->local,
685                         sdata->local->hw.conf.channel->band);
686         sdata->drop_unencrypted = 0;
687
688         return 0;
689 }
690
691 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
692                      struct net_device **new_dev, enum nl80211_iftype type,
693                      struct vif_params *params)
694 {
695         struct net_device *ndev;
696         struct ieee80211_sub_if_data *sdata = NULL;
697         int ret, i;
698
699         ASSERT_RTNL();
700
701         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
702                             name, ieee80211_if_setup);
703         if (!ndev)
704                 return -ENOMEM;
705
706         ndev->needed_headroom = local->tx_headroom +
707                                 4*6 /* four MAC addresses */
708                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
709                                 + 6 /* mesh */
710                                 + 8 /* rfc1042/bridge tunnel */
711                                 - ETH_HLEN /* ethernet hard_header_len */
712                                 + IEEE80211_ENCRYPT_HEADROOM;
713         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
714
715         ret = dev_alloc_name(ndev, ndev->name);
716         if (ret < 0)
717                 goto fail;
718
719         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
720         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
721
722         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
723         sdata = netdev_priv(ndev);
724         ndev->ieee80211_ptr = &sdata->wdev;
725
726         /* initialise type-independent data */
727         sdata->wdev.wiphy = local->hw.wiphy;
728         sdata->local = local;
729         sdata->dev = ndev;
730
731         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
732                 skb_queue_head_init(&sdata->fragments[i].skb_list);
733
734         INIT_LIST_HEAD(&sdata->key_list);
735
736         sdata->force_unicast_rateidx = -1;
737         sdata->max_ratectrl_rateidx = -1;
738
739         /* setup type-dependent data */
740         ieee80211_setup_sdata(sdata, type);
741
742         ret = register_netdevice(ndev);
743         if (ret)
744                 goto fail;
745
746         ndev->uninit = ieee80211_teardown_sdata;
747
748         if (ieee80211_vif_is_mesh(&sdata->vif) &&
749             params && params->mesh_id_len)
750                 ieee80211_sdata_set_mesh_id(sdata,
751                                             params->mesh_id_len,
752                                             params->mesh_id);
753
754         list_add_tail_rcu(&sdata->list, &local->interfaces);
755
756         if (new_dev)
757                 *new_dev = ndev;
758
759         return 0;
760
761  fail:
762         free_netdev(ndev);
763         return ret;
764 }
765
766 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
767 {
768         ASSERT_RTNL();
769
770         list_del_rcu(&sdata->list);
771         synchronize_rcu();
772         unregister_netdevice(sdata->dev);
773 }
774
775 /*
776  * Remove all interfaces, may only be called at hardware unregistration
777  * time because it doesn't do RCU-safe list removals.
778  */
779 void ieee80211_remove_interfaces(struct ieee80211_local *local)
780 {
781         struct ieee80211_sub_if_data *sdata, *tmp;
782
783         ASSERT_RTNL();
784
785         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
786                 list_del(&sdata->list);
787                 unregister_netdevice(sdata->dev);
788         }
789 }