net: mac80211: Convert printk(KERN_DEBUG to pr_debug
[linux-3.10.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/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30  * DOC: Interface list locking
31  *
32  * The interface list in each struct ieee80211_local is protected
33  * three-fold:
34  *
35  * (1) modifications may only be done under the RTNL
36  * (2) modifications and readers are protected against each other by
37  *     the iflist_mtx.
38  * (3) modifications are done in an RCU manner so atomic readers
39  *     can traverse the list in RCU-safe blocks.
40  *
41  * As a consequence, reads (traversals) of the list can be protected
42  * by either the RTNL, the iflist_mtx or RCU.
43  */
44
45
46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
47 {
48         int meshhdrlen;
49         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
50
51         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
52
53         /* FIX: what would be proper limits for MTU?
54          * This interface uses 802.3 frames. */
55         if (new_mtu < 256 ||
56             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
57                 return -EINVAL;
58         }
59
60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
61         pr_debug("%s: setting MTU %d\n", dev->name, new_mtu);
62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
63         dev->mtu = new_mtu;
64         return 0;
65 }
66
67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
68 {
69         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
70         struct sockaddr *sa = addr;
71         int ret;
72
73         if (ieee80211_sdata_running(sdata))
74                 return -EBUSY;
75
76         ret = eth_mac_addr(dev, sa);
77
78         if (ret == 0)
79                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
80
81         return ret;
82 }
83
84 static inline int identical_mac_addr_allowed(int type1, int type2)
85 {
86         return type1 == NL80211_IFTYPE_MONITOR ||
87                 type2 == NL80211_IFTYPE_MONITOR ||
88                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
89                 (type1 == NL80211_IFTYPE_WDS &&
90                         (type2 == NL80211_IFTYPE_WDS ||
91                          type2 == NL80211_IFTYPE_AP)) ||
92                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
93                 (type1 == NL80211_IFTYPE_AP_VLAN &&
94                         (type2 == NL80211_IFTYPE_AP ||
95                          type2 == NL80211_IFTYPE_AP_VLAN));
96 }
97
98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
99                                             enum nl80211_iftype iftype)
100 {
101         struct ieee80211_local *local = sdata->local;
102         struct ieee80211_sub_if_data *nsdata;
103         struct net_device *dev = sdata->dev;
104
105         ASSERT_RTNL();
106
107         /* we hold the RTNL here so can safely walk the list */
108         list_for_each_entry(nsdata, &local->interfaces, list) {
109                 struct net_device *ndev = nsdata->dev;
110
111                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
112                         /*
113                          * Allow only a single IBSS interface to be up at any
114                          * time. This is restricted because beacon distribution
115                          * cannot work properly if both are in the same IBSS.
116                          *
117                          * To remove this restriction we'd have to disallow them
118                          * from setting the same SSID on different IBSS interfaces
119                          * belonging to the same hardware. Then, however, we're
120                          * faced with having to adopt two different TSF timers...
121                          */
122                         if (iftype == NL80211_IFTYPE_ADHOC &&
123                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
124                                 return -EBUSY;
125
126                         /*
127                          * The remaining checks are only performed for interfaces
128                          * with the same MAC address.
129                          */
130                         if (!ether_addr_equal(dev->dev_addr, ndev->dev_addr))
131                                 continue;
132
133                         /*
134                          * check whether it may have the same address
135                          */
136                         if (!identical_mac_addr_allowed(iftype,
137                                                         nsdata->vif.type))
138                                 return -ENOTUNIQ;
139
140                         /*
141                          * can only add VLANs to enabled APs
142                          */
143                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
144                             nsdata->vif.type == NL80211_IFTYPE_AP)
145                                 sdata->bss = &nsdata->u.ap;
146                 }
147         }
148
149         return 0;
150 }
151
152 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
153 {
154         int n_queues = sdata->local->hw.queues;
155         int i;
156
157         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
158                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
159                                  IEEE80211_INVAL_HW_QUEUE))
160                         return -EINVAL;
161                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
162                                  n_queues))
163                         return -EINVAL;
164         }
165
166         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
167             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
168                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
169                 return 0;
170         }
171
172         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
173                 return -EINVAL;
174
175         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
176                 return -EINVAL;
177
178         return 0;
179 }
180
181 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
182                                     const int offset)
183 {
184         struct ieee80211_local *local = sdata->local;
185         u32 flags = sdata->u.mntr_flags;
186
187 #define ADJUST(_f, _s)  do {                                    \
188         if (flags & MONITOR_FLAG_##_f)                          \
189                 local->fif_##_s += offset;                      \
190         } while (0)
191
192         ADJUST(FCSFAIL, fcsfail);
193         ADJUST(PLCPFAIL, plcpfail);
194         ADJUST(CONTROL, control);
195         ADJUST(CONTROL, pspoll);
196         ADJUST(OTHER_BSS, other_bss);
197
198 #undef ADJUST
199 }
200
201 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
202 {
203         struct ieee80211_local *local = sdata->local;
204         int i;
205
206         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
207                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
208                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
209                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
210                         sdata->vif.hw_queue[i] = i;
211                 else
212                         sdata->vif.hw_queue[i] = 0;
213         }
214         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
215 }
216
217 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
218 {
219         struct ieee80211_sub_if_data *sdata;
220         int ret;
221
222         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
223                 return 0;
224
225         if (local->monitor_sdata)
226                 return 0;
227
228         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
229         if (!sdata)
230                 return -ENOMEM;
231
232         /* set up data */
233         sdata->local = local;
234         sdata->vif.type = NL80211_IFTYPE_MONITOR;
235         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
236                  wiphy_name(local->hw.wiphy));
237
238         ieee80211_set_default_queues(sdata);
239
240         ret = drv_add_interface(local, sdata);
241         if (WARN_ON(ret)) {
242                 /* ok .. stupid driver, it asked for this! */
243                 kfree(sdata);
244                 return ret;
245         }
246
247         ret = ieee80211_check_queues(sdata);
248         if (ret) {
249                 kfree(sdata);
250                 return ret;
251         }
252
253         rcu_assign_pointer(local->monitor_sdata, sdata);
254
255         return 0;
256 }
257
258 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
259 {
260         struct ieee80211_sub_if_data *sdata;
261
262         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
263                 return;
264
265         sdata = rtnl_dereference(local->monitor_sdata);
266
267         if (!sdata)
268                 return;
269
270         rcu_assign_pointer(local->monitor_sdata, NULL);
271         synchronize_net();
272
273         drv_remove_interface(local, sdata);
274
275         kfree(sdata);
276 }
277
278 /*
279  * NOTE: Be very careful when changing this function, it must NOT return
280  * an error on interface type changes that have been pre-checked, so most
281  * checks should be in ieee80211_check_concurrent_iface.
282  */
283 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
284 {
285         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
286         struct ieee80211_local *local = sdata->local;
287         struct sta_info *sta;
288         u32 changed = 0;
289         int res;
290         u32 hw_reconf_flags = 0;
291
292         switch (sdata->vif.type) {
293         case NL80211_IFTYPE_WDS:
294                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
295                         return -ENOLINK;
296                 break;
297         case NL80211_IFTYPE_AP_VLAN: {
298                 struct ieee80211_sub_if_data *master;
299
300                 if (!sdata->bss)
301                         return -ENOLINK;
302
303                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
304
305                 master = container_of(sdata->bss,
306                                       struct ieee80211_sub_if_data, u.ap);
307                 sdata->control_port_protocol =
308                         master->control_port_protocol;
309                 sdata->control_port_no_encrypt =
310                         master->control_port_no_encrypt;
311                 break;
312                 }
313         case NL80211_IFTYPE_AP:
314                 sdata->bss = &sdata->u.ap;
315                 break;
316         case NL80211_IFTYPE_MESH_POINT:
317         case NL80211_IFTYPE_STATION:
318         case NL80211_IFTYPE_MONITOR:
319         case NL80211_IFTYPE_ADHOC:
320                 /* no special treatment */
321                 break;
322         case NL80211_IFTYPE_UNSPECIFIED:
323         case NUM_NL80211_IFTYPES:
324         case NL80211_IFTYPE_P2P_CLIENT:
325         case NL80211_IFTYPE_P2P_GO:
326                 /* cannot happen */
327                 WARN_ON(1);
328                 break;
329         }
330
331         if (local->open_count == 0) {
332                 res = drv_start(local);
333                 if (res)
334                         goto err_del_bss;
335                 if (local->ops->napi_poll)
336                         napi_enable(&local->napi);
337                 /* we're brought up, everything changes */
338                 hw_reconf_flags = ~0;
339                 ieee80211_led_radio(local, true);
340                 ieee80211_mod_tpt_led_trig(local,
341                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
342         }
343
344         /*
345          * Copy the hopefully now-present MAC address to
346          * this interface, if it has the special null one.
347          */
348         if (is_zero_ether_addr(dev->dev_addr)) {
349                 memcpy(dev->dev_addr,
350                        local->hw.wiphy->perm_addr,
351                        ETH_ALEN);
352                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
353
354                 if (!is_valid_ether_addr(dev->dev_addr)) {
355                         res = -EADDRNOTAVAIL;
356                         goto err_stop;
357                 }
358         }
359
360         switch (sdata->vif.type) {
361         case NL80211_IFTYPE_AP_VLAN:
362                 /* no need to tell driver, but set carrier */
363                 if (rtnl_dereference(sdata->bss->beacon))
364                         netif_carrier_on(dev);
365                 else
366                         netif_carrier_off(dev);
367                 break;
368         case NL80211_IFTYPE_MONITOR:
369                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
370                         local->cooked_mntrs++;
371                         break;
372                 }
373
374                 if (local->monitors == 0 && local->open_count == 0) {
375                         res = ieee80211_add_virtual_monitor(local);
376                         if (res)
377                                 goto err_stop;
378                 }
379
380                 /* must be before the call to ieee80211_configure_filter */
381                 local->monitors++;
382                 if (local->monitors == 1) {
383                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
384                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
385                 }
386
387                 ieee80211_adjust_monitor_flags(sdata, 1);
388                 ieee80211_configure_filter(local);
389
390                 netif_carrier_on(dev);
391                 break;
392         default:
393                 if (coming_up) {
394                         ieee80211_del_virtual_monitor(local);
395
396                         res = drv_add_interface(local, sdata);
397                         if (res)
398                                 goto err_stop;
399                         res = ieee80211_check_queues(sdata);
400                         if (res)
401                                 goto err_del_interface;
402                 }
403
404                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
405                         local->fif_pspoll++;
406                         local->fif_probe_req++;
407
408                         ieee80211_configure_filter(local);
409                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
410                         local->fif_probe_req++;
411                 }
412
413                 changed |= ieee80211_reset_erp_info(sdata);
414                 ieee80211_bss_info_change_notify(sdata, changed);
415
416                 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
417                     sdata->vif.type == NL80211_IFTYPE_ADHOC ||
418                     sdata->vif.type == NL80211_IFTYPE_AP)
419                         netif_carrier_off(dev);
420                 else
421                         netif_carrier_on(dev);
422
423                 /*
424                  * set default queue parameters so drivers don't
425                  * need to initialise the hardware if the hardware
426                  * doesn't start up with sane defaults
427                  */
428                 ieee80211_set_wmm_default(sdata, true);
429         }
430
431         set_bit(SDATA_STATE_RUNNING, &sdata->state);
432
433         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
434                 /* Create STA entry for the WDS peer */
435                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
436                                      GFP_KERNEL);
437                 if (!sta) {
438                         res = -ENOMEM;
439                         goto err_del_interface;
440                 }
441
442                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
443                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
444                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
445
446                 res = sta_info_insert(sta);
447                 if (res) {
448                         /* STA has been freed */
449                         goto err_del_interface;
450                 }
451
452                 rate_control_rate_init(sta);
453         }
454
455         /*
456          * set_multicast_list will be invoked by the networking core
457          * which will check whether any increments here were done in
458          * error and sync them down to the hardware as filter flags.
459          */
460         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
461                 atomic_inc(&local->iff_allmultis);
462
463         if (sdata->flags & IEEE80211_SDATA_PROMISC)
464                 atomic_inc(&local->iff_promiscs);
465
466         mutex_lock(&local->mtx);
467         hw_reconf_flags |= __ieee80211_recalc_idle(local);
468         mutex_unlock(&local->mtx);
469
470         if (coming_up)
471                 local->open_count++;
472
473         if (hw_reconf_flags)
474                 ieee80211_hw_config(local, hw_reconf_flags);
475
476         ieee80211_recalc_ps(local, -1);
477
478         netif_tx_start_all_queues(dev);
479
480         return 0;
481  err_del_interface:
482         drv_remove_interface(local, sdata);
483  err_stop:
484         if (!local->open_count)
485                 drv_stop(local);
486  err_del_bss:
487         sdata->bss = NULL;
488         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
489                 list_del(&sdata->u.vlan.list);
490         /* might already be clear but that doesn't matter */
491         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
492         return res;
493 }
494
495 static int ieee80211_open(struct net_device *dev)
496 {
497         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
498         int err;
499
500         /* fail early if user set an invalid address */
501         if (!is_valid_ether_addr(dev->dev_addr))
502                 return -EADDRNOTAVAIL;
503
504         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
505         if (err)
506                 return err;
507
508         return ieee80211_do_open(dev, true);
509 }
510
511 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
512                               bool going_down)
513 {
514         struct ieee80211_local *local = sdata->local;
515         unsigned long flags;
516         struct sk_buff *skb, *tmp;
517         u32 hw_reconf_flags = 0;
518         int i;
519         enum nl80211_channel_type orig_ct;
520
521         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
522
523         if (local->scan_sdata == sdata)
524                 ieee80211_scan_cancel(local);
525
526         /*
527          * Stop TX on this interface first.
528          */
529         netif_tx_stop_all_queues(sdata->dev);
530
531         /*
532          * Purge work for this interface.
533          */
534         ieee80211_work_purge(sdata);
535
536         /*
537          * Remove all stations associated with this interface.
538          *
539          * This must be done before calling ops->remove_interface()
540          * because otherwise we can later invoke ops->sta_notify()
541          * whenever the STAs are removed, and that invalidates driver
542          * assumptions about always getting a vif pointer that is valid
543          * (because if we remove a STA after ops->remove_interface()
544          * the driver will have removed the vif info already!)
545          *
546          * This is relevant only in AP, WDS and mesh modes, since in
547          * all other modes we've already removed all stations when
548          * disconnecting etc.
549          */
550         sta_info_flush(local, sdata);
551
552         /*
553          * Don't count this interface for promisc/allmulti while it
554          * is down. dev_mc_unsync() will invoke set_multicast_list
555          * on the master interface which will sync these down to the
556          * hardware as filter flags.
557          */
558         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
559                 atomic_dec(&local->iff_allmultis);
560
561         if (sdata->flags & IEEE80211_SDATA_PROMISC)
562                 atomic_dec(&local->iff_promiscs);
563
564         if (sdata->vif.type == NL80211_IFTYPE_AP) {
565                 local->fif_pspoll--;
566                 local->fif_probe_req--;
567         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
568                 local->fif_probe_req--;
569         }
570
571         netif_addr_lock_bh(sdata->dev);
572         spin_lock_bh(&local->filter_lock);
573         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
574                          sdata->dev->addr_len);
575         spin_unlock_bh(&local->filter_lock);
576         netif_addr_unlock_bh(sdata->dev);
577
578         ieee80211_configure_filter(local);
579
580         del_timer_sync(&local->dynamic_ps_timer);
581         cancel_work_sync(&local->dynamic_ps_enable_work);
582
583         /* APs need special treatment */
584         if (sdata->vif.type == NL80211_IFTYPE_AP) {
585                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
586                 struct beacon_data *old_beacon =
587                         rtnl_dereference(sdata->u.ap.beacon);
588                 struct sk_buff *old_probe_resp =
589                         rtnl_dereference(sdata->u.ap.probe_resp);
590
591                 /* sdata_running will return false, so this will disable */
592                 ieee80211_bss_info_change_notify(sdata,
593                                                  BSS_CHANGED_BEACON_ENABLED);
594
595                 /* remove beacon and probe response */
596                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
597                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
598                 synchronize_rcu();
599                 kfree(old_beacon);
600                 kfree_skb(old_probe_resp);
601
602                 /* down all dependent devices, that is VLANs */
603                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
604                                          u.vlan.list)
605                         dev_close(vlan->dev);
606                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
607
608                 /* free all potentially still buffered bcast frames */
609                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
610                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
611         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
612                 ieee80211_mgd_stop(sdata);
613         }
614
615         if (going_down)
616                 local->open_count--;
617
618         switch (sdata->vif.type) {
619         case NL80211_IFTYPE_AP_VLAN:
620                 list_del(&sdata->u.vlan.list);
621                 /* no need to tell driver */
622                 break;
623         case NL80211_IFTYPE_MONITOR:
624                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
625                         local->cooked_mntrs--;
626                         break;
627                 }
628
629                 local->monitors--;
630                 if (local->monitors == 0) {
631                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
632                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
633                         ieee80211_del_virtual_monitor(local);
634                 }
635
636                 ieee80211_adjust_monitor_flags(sdata, -1);
637                 ieee80211_configure_filter(local);
638                 break;
639         default:
640                 flush_work(&sdata->work);
641                 /*
642                  * When we get here, the interface is marked down.
643                  * Call synchronize_rcu() to wait for the RX path
644                  * should it be using the interface and enqueuing
645                  * frames at this very time on another CPU.
646                  */
647                 synchronize_rcu();
648                 skb_queue_purge(&sdata->skb_queue);
649
650                 /*
651                  * Disable beaconing here for mesh only, AP and IBSS
652                  * are already taken care of.
653                  */
654                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
655                         ieee80211_bss_info_change_notify(sdata,
656                                 BSS_CHANGED_BEACON_ENABLED);
657
658                 /*
659                  * Free all remaining keys, there shouldn't be any,
660                  * except maybe group keys in AP more or WDS?
661                  */
662                 ieee80211_free_keys(sdata);
663
664                 if (going_down)
665                         drv_remove_interface(local, sdata);
666         }
667
668         sdata->bss = NULL;
669
670         mutex_lock(&local->mtx);
671         hw_reconf_flags |= __ieee80211_recalc_idle(local);
672         mutex_unlock(&local->mtx);
673
674         ieee80211_recalc_ps(local, -1);
675
676         if (local->open_count == 0) {
677                 if (local->ops->napi_poll)
678                         napi_disable(&local->napi);
679                 ieee80211_clear_tx_pending(local);
680                 ieee80211_stop_device(local);
681
682                 /* no reconfiguring after stop! */
683                 hw_reconf_flags = 0;
684         }
685
686         /* Re-calculate channel-type, in case there are multiple vifs
687          * on different channel types.
688          */
689         orig_ct = local->_oper_channel_type;
690         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
691
692         /* do after stop to avoid reconfiguring when we stop anyway */
693         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
694                 ieee80211_hw_config(local, hw_reconf_flags);
695
696         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
697         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
698                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
699                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
700                         if (info->control.vif == &sdata->vif) {
701                                 __skb_unlink(skb, &local->pending[i]);
702                                 dev_kfree_skb_irq(skb);
703                         }
704                 }
705         }
706         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
707
708         if (local->monitors == local->open_count && local->monitors > 0)
709                 ieee80211_add_virtual_monitor(local);
710 }
711
712 static int ieee80211_stop(struct net_device *dev)
713 {
714         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
715
716         ieee80211_do_stop(sdata, true);
717
718         return 0;
719 }
720
721 static void ieee80211_set_multicast_list(struct net_device *dev)
722 {
723         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
724         struct ieee80211_local *local = sdata->local;
725         int allmulti, promisc, sdata_allmulti, sdata_promisc;
726
727         allmulti = !!(dev->flags & IFF_ALLMULTI);
728         promisc = !!(dev->flags & IFF_PROMISC);
729         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
730         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
731
732         if (allmulti != sdata_allmulti) {
733                 if (dev->flags & IFF_ALLMULTI)
734                         atomic_inc(&local->iff_allmultis);
735                 else
736                         atomic_dec(&local->iff_allmultis);
737                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
738         }
739
740         if (promisc != sdata_promisc) {
741                 if (dev->flags & IFF_PROMISC)
742                         atomic_inc(&local->iff_promiscs);
743                 else
744                         atomic_dec(&local->iff_promiscs);
745                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
746         }
747         spin_lock_bh(&local->filter_lock);
748         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
749         spin_unlock_bh(&local->filter_lock);
750         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
751 }
752
753 /*
754  * Called when the netdev is removed or, by the code below, before
755  * the interface type changes.
756  */
757 static void ieee80211_teardown_sdata(struct net_device *dev)
758 {
759         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
760         struct ieee80211_local *local = sdata->local;
761         int flushed;
762         int i;
763
764         /* free extra data */
765         ieee80211_free_keys(sdata);
766
767         ieee80211_debugfs_remove_netdev(sdata);
768
769         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
770                 __skb_queue_purge(&sdata->fragments[i].skb_list);
771         sdata->fragment_next = 0;
772
773         if (ieee80211_vif_is_mesh(&sdata->vif))
774                 mesh_rmc_free(sdata);
775
776         flushed = sta_info_flush(local, sdata);
777         WARN_ON(flushed);
778 }
779
780 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
781                                          struct sk_buff *skb)
782 {
783         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
784 }
785
786 static const struct net_device_ops ieee80211_dataif_ops = {
787         .ndo_open               = ieee80211_open,
788         .ndo_stop               = ieee80211_stop,
789         .ndo_uninit             = ieee80211_teardown_sdata,
790         .ndo_start_xmit         = ieee80211_subif_start_xmit,
791         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
792         .ndo_change_mtu         = ieee80211_change_mtu,
793         .ndo_set_mac_address    = ieee80211_change_mac,
794         .ndo_select_queue       = ieee80211_netdev_select_queue,
795 };
796
797 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
798                                           struct sk_buff *skb)
799 {
800         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
801         struct ieee80211_local *local = sdata->local;
802         struct ieee80211_hdr *hdr;
803         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
804
805         if (local->hw.queues < IEEE80211_NUM_ACS)
806                 return 0;
807
808         if (skb->len < 4 ||
809             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
810                 return 0; /* doesn't matter, frame will be dropped */
811
812         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
813
814         return ieee80211_select_queue_80211(local, skb, hdr);
815 }
816
817 static const struct net_device_ops ieee80211_monitorif_ops = {
818         .ndo_open               = ieee80211_open,
819         .ndo_stop               = ieee80211_stop,
820         .ndo_uninit             = ieee80211_teardown_sdata,
821         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
822         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
823         .ndo_change_mtu         = ieee80211_change_mtu,
824         .ndo_set_mac_address    = eth_mac_addr,
825         .ndo_select_queue       = ieee80211_monitor_select_queue,
826 };
827
828 static void ieee80211_if_setup(struct net_device *dev)
829 {
830         ether_setup(dev);
831         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
832         dev->netdev_ops = &ieee80211_dataif_ops;
833         dev->destructor = free_netdev;
834 }
835
836 static void ieee80211_iface_work(struct work_struct *work)
837 {
838         struct ieee80211_sub_if_data *sdata =
839                 container_of(work, struct ieee80211_sub_if_data, work);
840         struct ieee80211_local *local = sdata->local;
841         struct sk_buff *skb;
842         struct sta_info *sta;
843         struct ieee80211_ra_tid *ra_tid;
844
845         if (!ieee80211_sdata_running(sdata))
846                 return;
847
848         if (local->scanning)
849                 return;
850
851         /*
852          * ieee80211_queue_work() should have picked up most cases,
853          * here we'll pick the rest.
854          */
855         if (WARN(local->suspended,
856                  "interface work scheduled while going to suspend\n"))
857                 return;
858
859         /* first process frames */
860         while ((skb = skb_dequeue(&sdata->skb_queue))) {
861                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
862
863                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
864                         ra_tid = (void *)&skb->cb;
865                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
866                                                  ra_tid->tid);
867                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
868                         ra_tid = (void *)&skb->cb;
869                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
870                                                 ra_tid->tid);
871                 } else if (ieee80211_is_action(mgmt->frame_control) &&
872                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
873                         int len = skb->len;
874
875                         mutex_lock(&local->sta_mtx);
876                         sta = sta_info_get_bss(sdata, mgmt->sa);
877                         if (sta) {
878                                 switch (mgmt->u.action.u.addba_req.action_code) {
879                                 case WLAN_ACTION_ADDBA_REQ:
880                                         ieee80211_process_addba_request(
881                                                         local, sta, mgmt, len);
882                                         break;
883                                 case WLAN_ACTION_ADDBA_RESP:
884                                         ieee80211_process_addba_resp(local, sta,
885                                                                      mgmt, len);
886                                         break;
887                                 case WLAN_ACTION_DELBA:
888                                         ieee80211_process_delba(sdata, sta,
889                                                                 mgmt, len);
890                                         break;
891                                 default:
892                                         WARN_ON(1);
893                                         break;
894                                 }
895                         }
896                         mutex_unlock(&local->sta_mtx);
897                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
898                         struct ieee80211_hdr *hdr = (void *)mgmt;
899                         /*
900                          * So the frame isn't mgmt, but frame_control
901                          * is at the right place anyway, of course, so
902                          * the if statement is correct.
903                          *
904                          * Warn if we have other data frame types here,
905                          * they must not get here.
906                          */
907                         WARN_ON(hdr->frame_control &
908                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
909                         WARN_ON(!(hdr->seq_ctrl &
910                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
911                         /*
912                          * This was a fragment of a frame, received while
913                          * a block-ack session was active. That cannot be
914                          * right, so terminate the session.
915                          */
916                         mutex_lock(&local->sta_mtx);
917                         sta = sta_info_get_bss(sdata, mgmt->sa);
918                         if (sta) {
919                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
920                                                 IEEE80211_QOS_CTL_TID_MASK;
921
922                                 __ieee80211_stop_rx_ba_session(
923                                         sta, tid, WLAN_BACK_RECIPIENT,
924                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
925                                         true);
926                         }
927                         mutex_unlock(&local->sta_mtx);
928                 } else switch (sdata->vif.type) {
929                 case NL80211_IFTYPE_STATION:
930                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
931                         break;
932                 case NL80211_IFTYPE_ADHOC:
933                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
934                         break;
935                 case NL80211_IFTYPE_MESH_POINT:
936                         if (!ieee80211_vif_is_mesh(&sdata->vif))
937                                 break;
938                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
939                         break;
940                 default:
941                         WARN(1, "frame for unexpected interface type");
942                         break;
943                 }
944
945                 kfree_skb(skb);
946         }
947
948         /* then other type-dependent work */
949         switch (sdata->vif.type) {
950         case NL80211_IFTYPE_STATION:
951                 ieee80211_sta_work(sdata);
952                 break;
953         case NL80211_IFTYPE_ADHOC:
954                 ieee80211_ibss_work(sdata);
955                 break;
956         case NL80211_IFTYPE_MESH_POINT:
957                 if (!ieee80211_vif_is_mesh(&sdata->vif))
958                         break;
959                 ieee80211_mesh_work(sdata);
960                 break;
961         default:
962                 break;
963         }
964 }
965
966
967 /*
968  * Helper function to initialise an interface to a specific type.
969  */
970 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
971                                   enum nl80211_iftype type)
972 {
973         /* clear type-dependent union */
974         memset(&sdata->u, 0, sizeof(sdata->u));
975
976         /* and set some type-dependent values */
977         sdata->vif.type = type;
978         sdata->vif.p2p = false;
979         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
980         sdata->wdev.iftype = type;
981
982         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
983         sdata->control_port_no_encrypt = false;
984
985         sdata->noack_map = 0;
986
987         /* only monitor differs */
988         sdata->dev->type = ARPHRD_ETHER;
989
990         skb_queue_head_init(&sdata->skb_queue);
991         INIT_WORK(&sdata->work, ieee80211_iface_work);
992
993         switch (type) {
994         case NL80211_IFTYPE_P2P_GO:
995                 type = NL80211_IFTYPE_AP;
996                 sdata->vif.type = type;
997                 sdata->vif.p2p = true;
998                 /* fall through */
999         case NL80211_IFTYPE_AP:
1000                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1001                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1002                 break;
1003         case NL80211_IFTYPE_P2P_CLIENT:
1004                 type = NL80211_IFTYPE_STATION;
1005                 sdata->vif.type = type;
1006                 sdata->vif.p2p = true;
1007                 /* fall through */
1008         case NL80211_IFTYPE_STATION:
1009                 ieee80211_sta_setup_sdata(sdata);
1010                 break;
1011         case NL80211_IFTYPE_ADHOC:
1012                 ieee80211_ibss_setup_sdata(sdata);
1013                 break;
1014         case NL80211_IFTYPE_MESH_POINT:
1015                 if (ieee80211_vif_is_mesh(&sdata->vif))
1016                         ieee80211_mesh_init_sdata(sdata);
1017                 break;
1018         case NL80211_IFTYPE_MONITOR:
1019                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1020                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1021                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1022                                       MONITOR_FLAG_OTHER_BSS;
1023                 break;
1024         case NL80211_IFTYPE_WDS:
1025         case NL80211_IFTYPE_AP_VLAN:
1026                 break;
1027         case NL80211_IFTYPE_UNSPECIFIED:
1028         case NUM_NL80211_IFTYPES:
1029                 BUG();
1030                 break;
1031         }
1032
1033         ieee80211_debugfs_add_netdev(sdata);
1034 }
1035
1036 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1037 {
1038         switch (sdata->vif.type) {
1039         case NL80211_IFTYPE_MESH_POINT:
1040                 mesh_path_flush_by_iface(sdata);
1041                 break;
1042
1043         default:
1044                 break;
1045         }
1046 }
1047
1048 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1049                                            enum nl80211_iftype type)
1050 {
1051         struct ieee80211_local *local = sdata->local;
1052         int ret, err;
1053         enum nl80211_iftype internal_type = type;
1054         bool p2p = false;
1055
1056         ASSERT_RTNL();
1057
1058         if (!local->ops->change_interface)
1059                 return -EBUSY;
1060
1061         switch (sdata->vif.type) {
1062         case NL80211_IFTYPE_AP:
1063         case NL80211_IFTYPE_STATION:
1064         case NL80211_IFTYPE_ADHOC:
1065                 /*
1066                  * Could maybe also all others here?
1067                  * Just not sure how that interacts
1068                  * with the RX/config path e.g. for
1069                  * mesh.
1070                  */
1071                 break;
1072         default:
1073                 return -EBUSY;
1074         }
1075
1076         switch (type) {
1077         case NL80211_IFTYPE_AP:
1078         case NL80211_IFTYPE_STATION:
1079         case NL80211_IFTYPE_ADHOC:
1080                 /*
1081                  * Could probably support everything
1082                  * but WDS here (WDS do_open can fail
1083                  * under memory pressure, which this
1084                  * code isn't prepared to handle).
1085                  */
1086                 break;
1087         case NL80211_IFTYPE_P2P_CLIENT:
1088                 p2p = true;
1089                 internal_type = NL80211_IFTYPE_STATION;
1090                 break;
1091         case NL80211_IFTYPE_P2P_GO:
1092                 p2p = true;
1093                 internal_type = NL80211_IFTYPE_AP;
1094                 break;
1095         default:
1096                 return -EBUSY;
1097         }
1098
1099         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1100         if (ret)
1101                 return ret;
1102
1103         ieee80211_do_stop(sdata, false);
1104
1105         ieee80211_teardown_sdata(sdata->dev);
1106
1107         ret = drv_change_interface(local, sdata, internal_type, p2p);
1108         if (ret)
1109                 type = sdata->vif.type;
1110
1111         /*
1112          * Ignore return value here, there's not much we can do since
1113          * the driver changed the interface type internally already.
1114          * The warnings will hopefully make driver authors fix it :-)
1115          */
1116         ieee80211_check_queues(sdata);
1117
1118         ieee80211_setup_sdata(sdata, type);
1119
1120         err = ieee80211_do_open(sdata->dev, false);
1121         WARN(err, "type change: do_open returned %d", err);
1122
1123         return ret;
1124 }
1125
1126 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1127                              enum nl80211_iftype type)
1128 {
1129         int ret;
1130
1131         ASSERT_RTNL();
1132
1133         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1134                 return 0;
1135
1136         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1137         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1138             type == NL80211_IFTYPE_ADHOC)
1139                 return -EOPNOTSUPP;
1140
1141         if (ieee80211_sdata_running(sdata)) {
1142                 ret = ieee80211_runtime_change_iftype(sdata, type);
1143                 if (ret)
1144                         return ret;
1145         } else {
1146                 /* Purge and reset type-dependent state. */
1147                 ieee80211_teardown_sdata(sdata->dev);
1148                 ieee80211_setup_sdata(sdata, type);
1149         }
1150
1151         /* reset some values that shouldn't be kept across type changes */
1152         sdata->vif.bss_conf.basic_rates =
1153                 ieee80211_mandatory_rates(sdata->local,
1154                         sdata->local->hw.conf.channel->band);
1155         sdata->drop_unencrypted = 0;
1156         if (type == NL80211_IFTYPE_STATION)
1157                 sdata->u.mgd.use_4addr = false;
1158
1159         return 0;
1160 }
1161
1162 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1163                                        struct net_device *dev,
1164                                        enum nl80211_iftype type)
1165 {
1166         struct ieee80211_sub_if_data *sdata;
1167         u64 mask, start, addr, val, inc;
1168         u8 *m;
1169         u8 tmp_addr[ETH_ALEN];
1170         int i;
1171
1172         /* default ... something at least */
1173         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1174
1175         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1176             local->hw.wiphy->n_addresses <= 1)
1177                 return;
1178
1179
1180         mutex_lock(&local->iflist_mtx);
1181
1182         switch (type) {
1183         case NL80211_IFTYPE_MONITOR:
1184                 /* doesn't matter */
1185                 break;
1186         case NL80211_IFTYPE_WDS:
1187         case NL80211_IFTYPE_AP_VLAN:
1188                 /* match up with an AP interface */
1189                 list_for_each_entry(sdata, &local->interfaces, list) {
1190                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1191                                 continue;
1192                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1193                         break;
1194                 }
1195                 /* keep default if no AP interface present */
1196                 break;
1197         default:
1198                 /* assign a new address if possible -- try n_addresses first */
1199                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1200                         bool used = false;
1201
1202                         list_for_each_entry(sdata, &local->interfaces, list) {
1203                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1204                                            sdata->vif.addr, ETH_ALEN) == 0) {
1205                                         used = true;
1206                                         break;
1207                                 }
1208                         }
1209
1210                         if (!used) {
1211                                 memcpy(dev->perm_addr,
1212                                        local->hw.wiphy->addresses[i].addr,
1213                                        ETH_ALEN);
1214                                 break;
1215                         }
1216                 }
1217
1218                 /* try mask if available */
1219                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1220                         break;
1221
1222                 m = local->hw.wiphy->addr_mask;
1223                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1224                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1225                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1226
1227                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1228                         /* not a contiguous mask ... not handled now! */
1229                         pr_debug("not contiguous\n");
1230                         break;
1231                 }
1232
1233                 m = local->hw.wiphy->perm_addr;
1234                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1235                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1236                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1237
1238                 inc = 1ULL<<__ffs64(mask);
1239                 val = (start & mask);
1240                 addr = (start & ~mask) | (val & mask);
1241                 do {
1242                         bool used = false;
1243
1244                         tmp_addr[5] = addr >> 0*8;
1245                         tmp_addr[4] = addr >> 1*8;
1246                         tmp_addr[3] = addr >> 2*8;
1247                         tmp_addr[2] = addr >> 3*8;
1248                         tmp_addr[1] = addr >> 4*8;
1249                         tmp_addr[0] = addr >> 5*8;
1250
1251                         val += inc;
1252
1253                         list_for_each_entry(sdata, &local->interfaces, list) {
1254                                 if (memcmp(tmp_addr, sdata->vif.addr,
1255                                                         ETH_ALEN) == 0) {
1256                                         used = true;
1257                                         break;
1258                                 }
1259                         }
1260
1261                         if (!used) {
1262                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1263                                 break;
1264                         }
1265                         addr = (start & ~mask) | (val & mask);
1266                 } while (addr != start);
1267
1268                 break;
1269         }
1270
1271         mutex_unlock(&local->iflist_mtx);
1272 }
1273
1274 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1275                      struct net_device **new_dev, enum nl80211_iftype type,
1276                      struct vif_params *params)
1277 {
1278         struct net_device *ndev;
1279         struct ieee80211_sub_if_data *sdata = NULL;
1280         int ret, i;
1281         int txqs = 1;
1282
1283         ASSERT_RTNL();
1284
1285         if (local->hw.queues >= IEEE80211_NUM_ACS)
1286                 txqs = IEEE80211_NUM_ACS;
1287
1288         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1289                                 name, ieee80211_if_setup, txqs, 1);
1290         if (!ndev)
1291                 return -ENOMEM;
1292         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1293
1294         ndev->needed_headroom = local->tx_headroom +
1295                                 4*6 /* four MAC addresses */
1296                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1297                                 + 6 /* mesh */
1298                                 + 8 /* rfc1042/bridge tunnel */
1299                                 - ETH_HLEN /* ethernet hard_header_len */
1300                                 + IEEE80211_ENCRYPT_HEADROOM;
1301         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1302
1303         ret = dev_alloc_name(ndev, ndev->name);
1304         if (ret < 0)
1305                 goto fail;
1306
1307         ieee80211_assign_perm_addr(local, ndev, type);
1308         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1309         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1310
1311         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1312         sdata = netdev_priv(ndev);
1313         ndev->ieee80211_ptr = &sdata->wdev;
1314         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1315         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1316
1317         /* initialise type-independent data */
1318         sdata->wdev.wiphy = local->hw.wiphy;
1319         sdata->local = local;
1320         sdata->dev = ndev;
1321 #ifdef CONFIG_INET
1322         sdata->arp_filter_state = true;
1323 #endif
1324
1325         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1326                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1327
1328         INIT_LIST_HEAD(&sdata->key_list);
1329
1330         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1331                 struct ieee80211_supported_band *sband;
1332                 sband = local->hw.wiphy->bands[i];
1333                 sdata->rc_rateidx_mask[i] =
1334                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1335                 if (sband)
1336                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1337                                sband->ht_cap.mcs.rx_mask,
1338                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1339                 else
1340                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1341                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1342         }
1343
1344         ieee80211_set_default_queues(sdata);
1345
1346         /* setup type-dependent data */
1347         ieee80211_setup_sdata(sdata, type);
1348
1349         if (params) {
1350                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1351                 if (type == NL80211_IFTYPE_STATION)
1352                         sdata->u.mgd.use_4addr = params->use_4addr;
1353         }
1354
1355         ndev->features |= local->hw.netdev_features;
1356
1357         ret = register_netdevice(ndev);
1358         if (ret)
1359                 goto fail;
1360
1361         mutex_lock(&local->iflist_mtx);
1362         list_add_tail_rcu(&sdata->list, &local->interfaces);
1363         mutex_unlock(&local->iflist_mtx);
1364
1365         if (new_dev)
1366                 *new_dev = ndev;
1367
1368         return 0;
1369
1370  fail:
1371         free_netdev(ndev);
1372         return ret;
1373 }
1374
1375 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1376 {
1377         ASSERT_RTNL();
1378
1379         mutex_lock(&sdata->local->iflist_mtx);
1380         list_del_rcu(&sdata->list);
1381         mutex_unlock(&sdata->local->iflist_mtx);
1382
1383         /* clean up type-dependent data */
1384         ieee80211_clean_sdata(sdata);
1385
1386         synchronize_rcu();
1387         unregister_netdevice(sdata->dev);
1388 }
1389
1390 /*
1391  * Remove all interfaces, may only be called at hardware unregistration
1392  * time because it doesn't do RCU-safe list removals.
1393  */
1394 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1395 {
1396         struct ieee80211_sub_if_data *sdata, *tmp;
1397         LIST_HEAD(unreg_list);
1398
1399         ASSERT_RTNL();
1400
1401         mutex_lock(&local->iflist_mtx);
1402         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1403                 list_del(&sdata->list);
1404
1405                 ieee80211_clean_sdata(sdata);
1406
1407                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1408         }
1409         mutex_unlock(&local->iflist_mtx);
1410         unregister_netdevice_many(&unreg_list);
1411         list_del(&unreg_list);
1412 }
1413
1414 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1415                               const char *reason)
1416 {
1417         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1418                 return 0;
1419
1420 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1421         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1422 #endif
1423
1424         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1425         return IEEE80211_CONF_CHANGE_IDLE;
1426 }
1427
1428 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1429 {
1430         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1431                 return 0;
1432
1433 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1434         wiphy_debug(local->hw.wiphy, "device now idle\n");
1435 #endif
1436
1437         drv_flush(local, false);
1438
1439         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1440         return IEEE80211_CONF_CHANGE_IDLE;
1441 }
1442
1443 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1444 {
1445         struct ieee80211_sub_if_data *sdata;
1446         int count = 0;
1447         bool working = false, scanning = false, hw_roc = false;
1448         struct ieee80211_work *wk;
1449         unsigned int led_trig_start = 0, led_trig_stop = 0;
1450
1451 #ifdef CONFIG_PROVE_LOCKING
1452         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1453                 !lockdep_is_held(&local->iflist_mtx));
1454 #endif
1455         lockdep_assert_held(&local->mtx);
1456
1457         list_for_each_entry(sdata, &local->interfaces, list) {
1458                 if (!ieee80211_sdata_running(sdata)) {
1459                         sdata->vif.bss_conf.idle = true;
1460                         continue;
1461                 }
1462
1463                 sdata->old_idle = sdata->vif.bss_conf.idle;
1464
1465                 /* do not count disabled managed interfaces */
1466                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1467                     !sdata->u.mgd.associated &&
1468                     !sdata->u.mgd.auth_data &&
1469                     !sdata->u.mgd.assoc_data) {
1470                         sdata->vif.bss_conf.idle = true;
1471                         continue;
1472                 }
1473                 /* do not count unused IBSS interfaces */
1474                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1475                     !sdata->u.ibss.ssid_len) {
1476                         sdata->vif.bss_conf.idle = true;
1477                         continue;
1478                 }
1479                 /* count everything else */
1480                 sdata->vif.bss_conf.idle = false;
1481                 count++;
1482         }
1483
1484         list_for_each_entry(wk, &local->work_list, list) {
1485                 working = true;
1486                 wk->sdata->vif.bss_conf.idle = false;
1487         }
1488
1489         if (local->scan_sdata &&
1490             !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1491                 scanning = true;
1492                 local->scan_sdata->vif.bss_conf.idle = false;
1493         }
1494
1495         if (local->hw_roc_channel)
1496                 hw_roc = true;
1497
1498         list_for_each_entry(sdata, &local->interfaces, list) {
1499                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1500                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1501                         continue;
1502                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1503                         continue;
1504                 if (!ieee80211_sdata_running(sdata))
1505                         continue;
1506                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1507         }
1508
1509         if (working || scanning || hw_roc)
1510                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1511         else
1512                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1513
1514         if (count)
1515                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1516         else
1517                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1518
1519         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1520
1521         if (hw_roc)
1522                 return ieee80211_idle_off(local, "hw remain-on-channel");
1523         if (working)
1524                 return ieee80211_idle_off(local, "working");
1525         if (scanning)
1526                 return ieee80211_idle_off(local, "scanning");
1527         if (!count)
1528                 return ieee80211_idle_on(local);
1529         else
1530                 return ieee80211_idle_off(local, "in use");
1531
1532         return 0;
1533 }
1534
1535 void ieee80211_recalc_idle(struct ieee80211_local *local)
1536 {
1537         u32 chg;
1538
1539         mutex_lock(&local->iflist_mtx);
1540         chg = __ieee80211_recalc_idle(local);
1541         mutex_unlock(&local->iflist_mtx);
1542         if (chg)
1543                 ieee80211_hw_config(local, chg);
1544 }
1545
1546 static int netdev_notify(struct notifier_block *nb,
1547                          unsigned long state,
1548                          void *ndev)
1549 {
1550         struct net_device *dev = ndev;
1551         struct ieee80211_sub_if_data *sdata;
1552
1553         if (state != NETDEV_CHANGENAME)
1554                 return 0;
1555
1556         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1557                 return 0;
1558
1559         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1560                 return 0;
1561
1562         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1563
1564         memcpy(sdata->name, dev->name, IFNAMSIZ);
1565
1566         ieee80211_debugfs_rename_netdev(sdata);
1567         return 0;
1568 }
1569
1570 static struct notifier_block mac80211_netdev_notifier = {
1571         .notifier_call = netdev_notify,
1572 };
1573
1574 int ieee80211_iface_init(void)
1575 {
1576         return register_netdevice_notifier(&mac80211_netdev_notifier);
1577 }
1578
1579 void ieee80211_iface_exit(void)
1580 {
1581         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1582 }