cfg80211/nl80211: scanning (and mac80211 update to use it)
[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 /**
25  * DOC: Interface list locking
26  *
27  * The interface list in each struct ieee80211_local is protected
28  * three-fold:
29  *
30  * (1) modifications may only be done under the RTNL
31  * (2) modifications and readers are protected against each other by
32  *     the iflist_mtx.
33  * (3) modifications are done in an RCU manner so atomic readers
34  *     can traverse the list in RCU-safe blocks.
35  *
36  * As a consequence, reads (traversals) of the list can be protected
37  * by either the RTNL, the iflist_mtx or RCU.
38  */
39
40
41 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
42 {
43         int meshhdrlen;
44         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
45
46         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
47
48         /* FIX: what would be proper limits for MTU?
49          * This interface uses 802.3 frames. */
50         if (new_mtu < 256 ||
51             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
52                 return -EINVAL;
53         }
54
55 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
56         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
57 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
58         dev->mtu = new_mtu;
59         return 0;
60 }
61
62 static inline int identical_mac_addr_allowed(int type1, int type2)
63 {
64         return type1 == NL80211_IFTYPE_MONITOR ||
65                 type2 == NL80211_IFTYPE_MONITOR ||
66                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
67                 (type1 == NL80211_IFTYPE_WDS &&
68                         (type2 == NL80211_IFTYPE_WDS ||
69                          type2 == NL80211_IFTYPE_AP)) ||
70                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
71                 (type1 == NL80211_IFTYPE_AP_VLAN &&
72                         (type2 == NL80211_IFTYPE_AP ||
73                          type2 == NL80211_IFTYPE_AP_VLAN));
74 }
75
76 static int ieee80211_open(struct net_device *dev)
77 {
78         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
79         struct ieee80211_sub_if_data *nsdata;
80         struct ieee80211_local *local = sdata->local;
81         struct sta_info *sta;
82         struct ieee80211_if_init_conf conf;
83         u32 changed = 0;
84         int res;
85         u32 hw_reconf_flags = 0;
86         u8 null_addr[ETH_ALEN] = {0};
87
88         /* fail early if user set an invalid address */
89         if (compare_ether_addr(dev->dev_addr, null_addr) &&
90             !is_valid_ether_addr(dev->dev_addr))
91                 return -EADDRNOTAVAIL;
92
93         /* we hold the RTNL here so can safely walk the list */
94         list_for_each_entry(nsdata, &local->interfaces, list) {
95                 struct net_device *ndev = nsdata->dev;
96
97                 if (ndev != dev && netif_running(ndev)) {
98                         /*
99                          * Allow only a single IBSS interface to be up at any
100                          * time. This is restricted because beacon distribution
101                          * cannot work properly if both are in the same IBSS.
102                          *
103                          * To remove this restriction we'd have to disallow them
104                          * from setting the same SSID on different IBSS interfaces
105                          * belonging to the same hardware. Then, however, we're
106                          * faced with having to adopt two different TSF timers...
107                          */
108                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
109                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
110                                 return -EBUSY;
111
112                         /*
113                          * The remaining checks are only performed for interfaces
114                          * with the same MAC address.
115                          */
116                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
117                                 continue;
118
119                         /*
120                          * check whether it may have the same address
121                          */
122                         if (!identical_mac_addr_allowed(sdata->vif.type,
123                                                         nsdata->vif.type))
124                                 return -ENOTUNIQ;
125
126                         /*
127                          * can only add VLANs to enabled APs
128                          */
129                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
130                             nsdata->vif.type == NL80211_IFTYPE_AP)
131                                 sdata->bss = &nsdata->u.ap;
132                 }
133         }
134
135         switch (sdata->vif.type) {
136         case NL80211_IFTYPE_WDS:
137                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
138                         return -ENOLINK;
139                 break;
140         case NL80211_IFTYPE_AP_VLAN:
141                 if (!sdata->bss)
142                         return -ENOLINK;
143                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
144                 break;
145         case NL80211_IFTYPE_AP:
146                 sdata->bss = &sdata->u.ap;
147                 break;
148         case NL80211_IFTYPE_MESH_POINT:
149                 if (!ieee80211_vif_is_mesh(&sdata->vif))
150                         break;
151                 /* mesh ifaces must set allmulti to forward mcast traffic */
152                 atomic_inc(&local->iff_allmultis);
153                 break;
154         case NL80211_IFTYPE_STATION:
155         case NL80211_IFTYPE_MONITOR:
156         case NL80211_IFTYPE_ADHOC:
157                 /* no special treatment */
158                 break;
159         case NL80211_IFTYPE_UNSPECIFIED:
160         case __NL80211_IFTYPE_AFTER_LAST:
161                 /* cannot happen */
162                 WARN_ON(1);
163                 break;
164         }
165
166         if (local->open_count == 0) {
167                 res = 0;
168                 if (local->ops->start)
169                         res = local->ops->start(local_to_hw(local));
170                 if (res)
171                         goto err_del_bss;
172                 /* we're brought up, everything changes */
173                 hw_reconf_flags = ~0;
174                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
175         }
176
177         /*
178          * Check all interfaces and copy the hopefully now-present
179          * MAC address to those that have the special null one.
180          */
181         list_for_each_entry(nsdata, &local->interfaces, list) {
182                 struct net_device *ndev = nsdata->dev;
183
184                 /*
185                  * No need to check netif_running since we do not allow
186                  * it to start up with this invalid address.
187                  */
188                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
189                         memcpy(ndev->dev_addr,
190                                local->hw.wiphy->perm_addr,
191                                ETH_ALEN);
192         }
193
194         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
195                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
196                        ETH_ALEN);
197
198         /*
199          * Validate the MAC address for this device.
200          */
201         if (!is_valid_ether_addr(dev->dev_addr)) {
202                 if (!local->open_count && local->ops->stop)
203                         local->ops->stop(local_to_hw(local));
204                 return -EADDRNOTAVAIL;
205         }
206
207         switch (sdata->vif.type) {
208         case NL80211_IFTYPE_AP_VLAN:
209                 /* no need to tell driver */
210                 break;
211         case NL80211_IFTYPE_MONITOR:
212                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
213                         local->cooked_mntrs++;
214                         break;
215                 }
216
217                 /* must be before the call to ieee80211_configure_filter */
218                 local->monitors++;
219                 if (local->monitors == 1) {
220                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
221                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
222                 }
223
224                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
225                         local->fif_fcsfail++;
226                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
227                         local->fif_plcpfail++;
228                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
229                         local->fif_control++;
230                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
231                         local->fif_other_bss++;
232
233                 netif_addr_lock_bh(local->mdev);
234                 ieee80211_configure_filter(local);
235                 netif_addr_unlock_bh(local->mdev);
236                 break;
237         case NL80211_IFTYPE_STATION:
238         case NL80211_IFTYPE_ADHOC:
239                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
240                 /* fall through */
241         default:
242                 conf.vif = &sdata->vif;
243                 conf.type = sdata->vif.type;
244                 conf.mac_addr = dev->dev_addr;
245                 res = local->ops->add_interface(local_to_hw(local), &conf);
246                 if (res)
247                         goto err_stop;
248
249                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
250                         local->fif_other_bss++;
251                         netif_addr_lock_bh(local->mdev);
252                         ieee80211_configure_filter(local);
253                         netif_addr_unlock_bh(local->mdev);
254
255                         ieee80211_start_mesh(sdata);
256                 }
257                 changed |= ieee80211_reset_erp_info(sdata);
258                 ieee80211_bss_info_change_notify(sdata, changed);
259                 ieee80211_enable_keys(sdata);
260
261                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
262                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
263                         netif_carrier_off(dev);
264                 else
265                         netif_carrier_on(dev);
266         }
267
268         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
269                 /* Create STA entry for the WDS peer */
270                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
271                                      GFP_KERNEL);
272                 if (!sta) {
273                         res = -ENOMEM;
274                         goto err_del_interface;
275                 }
276
277                 /* no locking required since STA is not live yet */
278                 sta->flags |= WLAN_STA_AUTHORIZED;
279
280                 res = sta_info_insert(sta);
281                 if (res) {
282                         /* STA has been freed */
283                         goto err_del_interface;
284                 }
285         }
286
287         if (local->open_count == 0) {
288                 res = dev_open(local->mdev);
289                 WARN_ON(res);
290                 if (res)
291                         goto err_del_interface;
292                 tasklet_enable(&local->tx_pending_tasklet);
293                 tasklet_enable(&local->tasklet);
294         }
295
296         /*
297          * set_multicast_list will be invoked by the networking core
298          * which will check whether any increments here were done in
299          * error and sync them down to the hardware as filter flags.
300          */
301         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
302                 atomic_inc(&local->iff_allmultis);
303
304         if (sdata->flags & IEEE80211_SDATA_PROMISC)
305                 atomic_inc(&local->iff_promiscs);
306
307         local->open_count++;
308         if (hw_reconf_flags) {
309                 ieee80211_hw_config(local, hw_reconf_flags);
310                 /*
311                  * set default queue parameters so drivers don't
312                  * need to initialise the hardware if the hardware
313                  * doesn't start up with sane defaults
314                  */
315                 ieee80211_set_wmm_default(sdata);
316         }
317
318         /*
319          * ieee80211_sta_work is disabled while network interface
320          * is down. Therefore, some configuration changes may not
321          * yet be effective. Trigger execution of ieee80211_sta_work
322          * to fix this.
323          */
324         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
325             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
326                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
327                 queue_work(local->hw.workqueue, &ifsta->work);
328         }
329
330         netif_tx_start_all_queues(dev);
331
332         return 0;
333  err_del_interface:
334         local->ops->remove_interface(local_to_hw(local), &conf);
335  err_stop:
336         if (!local->open_count && local->ops->stop)
337                 local->ops->stop(local_to_hw(local));
338  err_del_bss:
339         sdata->bss = NULL;
340         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
341                 list_del(&sdata->u.vlan.list);
342         return res;
343 }
344
345 static int ieee80211_stop(struct net_device *dev)
346 {
347         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
348         struct ieee80211_local *local = sdata->local;
349         struct ieee80211_if_init_conf conf;
350         struct sta_info *sta;
351         u32 hw_reconf_flags = 0;
352
353         /*
354          * Stop TX on this interface first.
355          */
356         netif_tx_stop_all_queues(dev);
357
358         /*
359          * Now delete all active aggregation sessions.
360          */
361         rcu_read_lock();
362
363         list_for_each_entry_rcu(sta, &local->sta_list, list) {
364                 if (sta->sdata == sdata)
365                         ieee80211_sta_tear_down_BA_sessions(sta);
366         }
367
368         rcu_read_unlock();
369
370         /*
371          * Remove all stations associated with this interface.
372          *
373          * This must be done before calling ops->remove_interface()
374          * because otherwise we can later invoke ops->sta_notify()
375          * whenever the STAs are removed, and that invalidates driver
376          * assumptions about always getting a vif pointer that is valid
377          * (because if we remove a STA after ops->remove_interface()
378          * the driver will have removed the vif info already!)
379          *
380          * We could relax this and only unlink the stations from the
381          * hash table and list but keep them on a per-sdata list that
382          * will be inserted back again when the interface is brought
383          * up again, but I don't currently see a use case for that,
384          * except with WDS which gets a STA entry created when it is
385          * brought up.
386          */
387         sta_info_flush(local, sdata);
388
389         /*
390          * Don't count this interface for promisc/allmulti while it
391          * is down. dev_mc_unsync() will invoke set_multicast_list
392          * on the master interface which will sync these down to the
393          * hardware as filter flags.
394          */
395         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
396                 atomic_dec(&local->iff_allmultis);
397
398         if (sdata->flags & IEEE80211_SDATA_PROMISC)
399                 atomic_dec(&local->iff_promiscs);
400
401         dev_mc_unsync(local->mdev, dev);
402         del_timer_sync(&local->dynamic_ps_timer);
403         cancel_work_sync(&local->dynamic_ps_enable_work);
404
405         /* APs need special treatment */
406         if (sdata->vif.type == NL80211_IFTYPE_AP) {
407                 struct ieee80211_sub_if_data *vlan, *tmp;
408                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
409
410                 /* remove beacon */
411                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
412                 synchronize_rcu();
413                 kfree(old_beacon);
414
415                 /* down all dependent devices, that is VLANs */
416                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
417                                          u.vlan.list)
418                         dev_close(vlan->dev);
419                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
420         }
421
422         local->open_count--;
423
424         switch (sdata->vif.type) {
425         case NL80211_IFTYPE_AP_VLAN:
426                 list_del(&sdata->u.vlan.list);
427                 /* no need to tell driver */
428                 break;
429         case NL80211_IFTYPE_MONITOR:
430                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
431                         local->cooked_mntrs--;
432                         break;
433                 }
434
435                 local->monitors--;
436                 if (local->monitors == 0) {
437                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
438                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
439                 }
440
441                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
442                         local->fif_fcsfail--;
443                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
444                         local->fif_plcpfail--;
445                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
446                         local->fif_control--;
447                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
448                         local->fif_other_bss--;
449
450                 netif_addr_lock_bh(local->mdev);
451                 ieee80211_configure_filter(local);
452                 netif_addr_unlock_bh(local->mdev);
453                 break;
454         case NL80211_IFTYPE_STATION:
455         case NL80211_IFTYPE_ADHOC:
456                 /* Announce that we are leaving the network. */
457                 if (sdata->u.sta.state != IEEE80211_STA_MLME_DISABLED)
458                         ieee80211_sta_deauthenticate(sdata,
459                                                 WLAN_REASON_DEAUTH_LEAVING);
460
461                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
462                 del_timer_sync(&sdata->u.sta.chswitch_timer);
463                 del_timer_sync(&sdata->u.sta.timer);
464                 /*
465                  * If the timer fired while we waited for it, it will have
466                  * requeued the work. Now the work will be running again
467                  * but will not rearm the timer again because it checks
468                  * whether the interface is running, which, at this point,
469                  * it no longer is.
470                  */
471                 cancel_work_sync(&sdata->u.sta.work);
472                 cancel_work_sync(&sdata->u.sta.chswitch_work);
473                 /*
474                  * When we get here, the interface is marked down.
475                  * Call synchronize_rcu() to wait for the RX path
476                  * should it be using the interface and enqueuing
477                  * frames at this very time on another CPU.
478                  */
479                 synchronize_rcu();
480                 skb_queue_purge(&sdata->u.sta.skb_queue);
481
482                 sdata->u.sta.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
483                                         IEEE80211_STA_TKIP_WEP_USED);
484                 kfree(sdata->u.sta.extra_ie);
485                 sdata->u.sta.extra_ie = NULL;
486                 sdata->u.sta.extra_ie_len = 0;
487                 /* fall through */
488         case NL80211_IFTYPE_MESH_POINT:
489                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
490                         /* other_bss and allmulti are always set on mesh
491                          * ifaces */
492                         local->fif_other_bss--;
493                         atomic_dec(&local->iff_allmultis);
494
495                         netif_addr_lock_bh(local->mdev);
496                         ieee80211_configure_filter(local);
497                         netif_addr_unlock_bh(local->mdev);
498
499                         ieee80211_stop_mesh(sdata);
500                 }
501                 /* fall through */
502         default:
503                 if (local->scan_sdata == sdata) {
504                         if (!local->ops->hw_scan)
505                                 cancel_delayed_work_sync(&local->scan_work);
506                         /*
507                          * The software scan can no longer run now, so we can
508                          * clear out the scan_sdata reference. However, the
509                          * hardware scan may still be running. The complete
510                          * function must be prepared to handle a NULL value.
511                          */
512                         local->scan_sdata = NULL;
513                         /*
514                          * The memory barrier guarantees that another CPU
515                          * that is hardware-scanning will now see the fact
516                          * that this interface is gone.
517                          */
518                         smp_mb();
519                         /*
520                          * If software scanning, complete the scan but since
521                          * the scan_sdata is NULL already don't send out a
522                          * scan event to userspace -- the scan is incomplete.
523                          */
524                         if (local->sw_scanning)
525                                 ieee80211_scan_completed(&local->hw, true);
526                 }
527
528                 conf.vif = &sdata->vif;
529                 conf.type = sdata->vif.type;
530                 conf.mac_addr = dev->dev_addr;
531                 /* disable all keys for as long as this netdev is down */
532                 ieee80211_disable_keys(sdata);
533                 local->ops->remove_interface(local_to_hw(local), &conf);
534         }
535
536         sdata->bss = NULL;
537
538         if (local->open_count == 0) {
539                 if (netif_running(local->mdev))
540                         dev_close(local->mdev);
541
542                 if (local->ops->stop)
543                         local->ops->stop(local_to_hw(local));
544
545                 ieee80211_led_radio(local, 0);
546
547                 flush_workqueue(local->hw.workqueue);
548
549                 tasklet_disable(&local->tx_pending_tasklet);
550                 tasklet_disable(&local->tasklet);
551
552                 /* no reconfiguring after stop! */
553                 hw_reconf_flags = 0;
554         }
555
556         /* do after stop to avoid reconfiguring when we stop anyway */
557         if (hw_reconf_flags)
558                 ieee80211_hw_config(local, hw_reconf_flags);
559
560         return 0;
561 }
562
563 static void ieee80211_set_multicast_list(struct net_device *dev)
564 {
565         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
566         struct ieee80211_local *local = sdata->local;
567         int allmulti, promisc, sdata_allmulti, sdata_promisc;
568
569         allmulti = !!(dev->flags & IFF_ALLMULTI);
570         promisc = !!(dev->flags & IFF_PROMISC);
571         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
572         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
573
574         if (allmulti != sdata_allmulti) {
575                 if (dev->flags & IFF_ALLMULTI)
576                         atomic_inc(&local->iff_allmultis);
577                 else
578                         atomic_dec(&local->iff_allmultis);
579                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
580         }
581
582         if (promisc != sdata_promisc) {
583                 if (dev->flags & IFF_PROMISC)
584                         atomic_inc(&local->iff_promiscs);
585                 else
586                         atomic_dec(&local->iff_promiscs);
587                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
588         }
589
590         dev_mc_sync(local->mdev, dev);
591 }
592
593 /*
594  * Called when the netdev is removed or, by the code below, before
595  * the interface type changes.
596  */
597 static void ieee80211_teardown_sdata(struct net_device *dev)
598 {
599         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
600         struct ieee80211_local *local = sdata->local;
601         struct beacon_data *beacon;
602         struct sk_buff *skb;
603         int flushed;
604         int i;
605
606         /* free extra data */
607         ieee80211_free_keys(sdata);
608
609         ieee80211_debugfs_remove_netdev(sdata);
610
611         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
612                 __skb_queue_purge(&sdata->fragments[i].skb_list);
613         sdata->fragment_next = 0;
614
615         switch (sdata->vif.type) {
616         case NL80211_IFTYPE_AP:
617                 beacon = sdata->u.ap.beacon;
618                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
619                 synchronize_rcu();
620                 kfree(beacon);
621
622                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
623                         local->total_ps_buffered--;
624                         dev_kfree_skb(skb);
625                 }
626
627                 break;
628         case NL80211_IFTYPE_MESH_POINT:
629                 if (ieee80211_vif_is_mesh(&sdata->vif))
630                         mesh_rmc_free(sdata);
631                 break;
632         case NL80211_IFTYPE_STATION:
633         case NL80211_IFTYPE_ADHOC:
634                 kfree(sdata->u.sta.extra_ie);
635                 kfree(sdata->u.sta.assocreq_ies);
636                 kfree(sdata->u.sta.assocresp_ies);
637                 kfree_skb(sdata->u.sta.probe_resp);
638                 kfree(sdata->u.sta.ie_probereq);
639                 kfree(sdata->u.sta.ie_proberesp);
640                 kfree(sdata->u.sta.ie_auth);
641                 kfree(sdata->u.sta.ie_assocreq);
642                 kfree(sdata->u.sta.ie_reassocreq);
643                 kfree(sdata->u.sta.ie_deauth);
644                 kfree(sdata->u.sta.ie_disassoc);
645                 break;
646         case NL80211_IFTYPE_WDS:
647         case NL80211_IFTYPE_AP_VLAN:
648         case NL80211_IFTYPE_MONITOR:
649                 break;
650         case NL80211_IFTYPE_UNSPECIFIED:
651         case __NL80211_IFTYPE_AFTER_LAST:
652                 BUG();
653                 break;
654         }
655
656         flushed = sta_info_flush(local, sdata);
657         WARN_ON(flushed);
658 }
659
660 static const struct net_device_ops ieee80211_dataif_ops = {
661         .ndo_open               = ieee80211_open,
662         .ndo_stop               = ieee80211_stop,
663         .ndo_uninit             = ieee80211_teardown_sdata,
664         .ndo_start_xmit         = ieee80211_subif_start_xmit,
665         .ndo_set_multicast_list = ieee80211_set_multicast_list,
666         .ndo_change_mtu         = ieee80211_change_mtu,
667         .ndo_set_mac_address    = eth_mac_addr,
668 };
669
670 static const struct net_device_ops ieee80211_monitorif_ops = {
671         .ndo_open               = ieee80211_open,
672         .ndo_stop               = ieee80211_stop,
673         .ndo_uninit             = ieee80211_teardown_sdata,
674         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
675         .ndo_set_multicast_list = ieee80211_set_multicast_list,
676         .ndo_change_mtu         = ieee80211_change_mtu,
677         .ndo_set_mac_address    = eth_mac_addr,
678 };
679
680 static void ieee80211_if_setup(struct net_device *dev)
681 {
682         ether_setup(dev);
683         dev->netdev_ops = &ieee80211_dataif_ops;
684         dev->wireless_handlers = &ieee80211_iw_handler_def;
685         dev->destructor = free_netdev;
686 }
687
688 /*
689  * Helper function to initialise an interface to a specific type.
690  */
691 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
692                                   enum nl80211_iftype type)
693 {
694         /* clear type-dependent union */
695         memset(&sdata->u, 0, sizeof(sdata->u));
696
697         /* and set some type-dependent values */
698         sdata->vif.type = type;
699         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
700         sdata->wdev.iftype = type;
701
702         /* only monitor differs */
703         sdata->dev->type = ARPHRD_ETHER;
704
705         switch (type) {
706         case NL80211_IFTYPE_AP:
707                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
708                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
709                 break;
710         case NL80211_IFTYPE_STATION:
711         case NL80211_IFTYPE_ADHOC:
712                 ieee80211_sta_setup_sdata(sdata);
713                 break;
714         case NL80211_IFTYPE_MESH_POINT:
715                 if (ieee80211_vif_is_mesh(&sdata->vif))
716                         ieee80211_mesh_init_sdata(sdata);
717                 break;
718         case NL80211_IFTYPE_MONITOR:
719                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
720                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
721                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
722                                       MONITOR_FLAG_OTHER_BSS;
723                 break;
724         case NL80211_IFTYPE_WDS:
725         case NL80211_IFTYPE_AP_VLAN:
726                 break;
727         case NL80211_IFTYPE_UNSPECIFIED:
728         case __NL80211_IFTYPE_AFTER_LAST:
729                 BUG();
730                 break;
731         }
732
733         ieee80211_debugfs_add_netdev(sdata);
734 }
735
736 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
737                              enum nl80211_iftype type)
738 {
739         ASSERT_RTNL();
740
741         if (type == sdata->vif.type)
742                 return 0;
743
744         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
745         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
746             type == NL80211_IFTYPE_ADHOC)
747                 return -EOPNOTSUPP;
748
749         /*
750          * We could, here, on changes between IBSS/STA/MESH modes,
751          * invoke an MLME function instead that disassociates etc.
752          * and goes into the requested mode.
753          */
754
755         if (netif_running(sdata->dev))
756                 return -EBUSY;
757
758         /* Purge and reset type-dependent state. */
759         ieee80211_teardown_sdata(sdata->dev);
760         ieee80211_setup_sdata(sdata, type);
761
762         /* reset some values that shouldn't be kept across type changes */
763         sdata->vif.bss_conf.basic_rates =
764                 ieee80211_mandatory_rates(sdata->local,
765                         sdata->local->hw.conf.channel->band);
766         sdata->drop_unencrypted = 0;
767
768         return 0;
769 }
770
771 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
772                      struct net_device **new_dev, enum nl80211_iftype type,
773                      struct vif_params *params)
774 {
775         struct net_device *ndev;
776         struct ieee80211_sub_if_data *sdata = NULL;
777         int ret, i;
778
779         ASSERT_RTNL();
780
781         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
782                             name, ieee80211_if_setup);
783         if (!ndev)
784                 return -ENOMEM;
785
786         ndev->needed_headroom = local->tx_headroom +
787                                 4*6 /* four MAC addresses */
788                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
789                                 + 6 /* mesh */
790                                 + 8 /* rfc1042/bridge tunnel */
791                                 - ETH_HLEN /* ethernet hard_header_len */
792                                 + IEEE80211_ENCRYPT_HEADROOM;
793         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
794
795         ret = dev_alloc_name(ndev, ndev->name);
796         if (ret < 0)
797                 goto fail;
798
799         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
800         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
801
802         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
803         sdata = netdev_priv(ndev);
804         ndev->ieee80211_ptr = &sdata->wdev;
805
806         /* initialise type-independent data */
807         sdata->wdev.wiphy = local->hw.wiphy;
808         sdata->local = local;
809         sdata->dev = ndev;
810
811         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
812                 skb_queue_head_init(&sdata->fragments[i].skb_list);
813
814         INIT_LIST_HEAD(&sdata->key_list);
815
816         sdata->force_unicast_rateidx = -1;
817         sdata->max_ratectrl_rateidx = -1;
818
819         /* setup type-dependent data */
820         ieee80211_setup_sdata(sdata, type);
821
822         ret = register_netdevice(ndev);
823         if (ret)
824                 goto fail;
825
826         if (ieee80211_vif_is_mesh(&sdata->vif) &&
827             params && params->mesh_id_len)
828                 ieee80211_sdata_set_mesh_id(sdata,
829                                             params->mesh_id_len,
830                                             params->mesh_id);
831
832         mutex_lock(&local->iflist_mtx);
833         list_add_tail_rcu(&sdata->list, &local->interfaces);
834         mutex_unlock(&local->iflist_mtx);
835
836         if (new_dev)
837                 *new_dev = ndev;
838
839         return 0;
840
841  fail:
842         free_netdev(ndev);
843         return ret;
844 }
845
846 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
847 {
848         ASSERT_RTNL();
849
850         mutex_lock(&sdata->local->iflist_mtx);
851         list_del_rcu(&sdata->list);
852         mutex_unlock(&sdata->local->iflist_mtx);
853
854         synchronize_rcu();
855         unregister_netdevice(sdata->dev);
856 }
857
858 /*
859  * Remove all interfaces, may only be called at hardware unregistration
860  * time because it doesn't do RCU-safe list removals.
861  */
862 void ieee80211_remove_interfaces(struct ieee80211_local *local)
863 {
864         struct ieee80211_sub_if_data *sdata, *tmp;
865
866         ASSERT_RTNL();
867
868         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
869                 /*
870                  * we cannot hold the iflist_mtx across unregister_netdevice,
871                  * but we only need to hold it for list modifications to lock
872                  * out readers since we're under the RTNL here as all other
873                  * writers.
874                  */
875                 mutex_lock(&local->iflist_mtx);
876                 list_del(&sdata->list);
877                 mutex_unlock(&local->iflist_mtx);
878
879                 unregister_netdevice(sdata->dev);
880         }
881 }