d0d5f20f1ec40dee41ed27aec1575bb015969c28
[linux-3.10.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling
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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47         struct ieee80211_chanctx_conf *chanctx_conf;
48         int power;
49
50         rcu_read_lock();
51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52         if (!chanctx_conf) {
53                 rcu_read_unlock();
54                 return false;
55         }
56
57         power = chanctx_conf->def.chan->max_power;
58         rcu_read_unlock();
59
60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61                 power = min(power, sdata->user_power_level);
62
63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64                 power = min(power, sdata->ap_power_level);
65
66         if (power != sdata->vif.bss_conf.txpower) {
67                 sdata->vif.bss_conf.txpower = power;
68                 ieee80211_hw_config(sdata->local, 0);
69                 return true;
70         }
71
72         return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77         if (__ieee80211_recalc_txpower(sdata))
78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 ieee80211_idle_off(struct ieee80211_local *local)
82 {
83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84                 return 0;
85
86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87         return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 ieee80211_idle_on(struct ieee80211_local *local)
91 {
92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93                 return 0;
94
95         ieee80211_flush_queues(local, NULL);
96
97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98         return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 void ieee80211_recalc_idle(struct ieee80211_local *local)
102 {
103         bool working = false, scanning, active;
104         unsigned int led_trig_start = 0, led_trig_stop = 0;
105         struct ieee80211_roc_work *roc;
106         u32 change;
107
108         lockdep_assert_held(&local->mtx);
109
110         active = !list_empty(&local->chanctx_list) || local->monitors;
111
112         if (!local->ops->remain_on_channel) {
113                 list_for_each_entry(roc, &local->roc_list, list) {
114                         working = true;
115                         break;
116                 }
117         }
118
119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121
122         if (working || scanning)
123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124         else
125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126
127         if (active)
128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129         else
130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131
132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133
134         if (working || scanning || active)
135                 change = ieee80211_idle_off(local);
136         else
137                 change = ieee80211_idle_on(local);
138         if (change)
139                 ieee80211_hw_config(local, change);
140 }
141
142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
143 {
144         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
145                 return -EINVAL;
146
147         dev->mtu = new_mtu;
148         return 0;
149 }
150
151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
152 {
153         struct ieee80211_sub_if_data *sdata;
154         u64 new, mask, tmp;
155         u8 *m;
156         int ret = 0;
157
158         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
159                 return 0;
160
161         m = addr;
162         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
163                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
164                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
165
166         m = local->hw.wiphy->addr_mask;
167         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171
172         mutex_lock(&local->iflist_mtx);
173         list_for_each_entry(sdata, &local->interfaces, list) {
174                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
175                         continue;
176
177                 m = sdata->vif.addr;
178                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181
182                 if ((new & ~mask) != (tmp & ~mask)) {
183                         ret = -EINVAL;
184                         break;
185                 }
186         }
187         mutex_unlock(&local->iflist_mtx);
188
189         return ret;
190 }
191
192 static int ieee80211_change_mac(struct net_device *dev, void *addr)
193 {
194         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
195         struct sockaddr *sa = addr;
196         int ret;
197
198         if (ieee80211_sdata_running(sdata))
199                 return -EBUSY;
200
201         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
202         if (ret)
203                 return ret;
204
205         ret = eth_mac_addr(dev, sa);
206
207         if (ret == 0)
208                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
209
210         return ret;
211 }
212
213 static inline int identical_mac_addr_allowed(int type1, int type2)
214 {
215         return type1 == NL80211_IFTYPE_MONITOR ||
216                 type2 == NL80211_IFTYPE_MONITOR ||
217                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
218                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
219                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
220                 (type1 == NL80211_IFTYPE_WDS &&
221                         (type2 == NL80211_IFTYPE_WDS ||
222                          type2 == NL80211_IFTYPE_AP)) ||
223                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
224                 (type1 == NL80211_IFTYPE_AP_VLAN &&
225                         (type2 == NL80211_IFTYPE_AP ||
226                          type2 == NL80211_IFTYPE_AP_VLAN));
227 }
228
229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
230                                             enum nl80211_iftype iftype)
231 {
232         struct ieee80211_local *local = sdata->local;
233         struct ieee80211_sub_if_data *nsdata;
234
235         ASSERT_RTNL();
236
237         /* we hold the RTNL here so can safely walk the list */
238         list_for_each_entry(nsdata, &local->interfaces, list) {
239                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
240                         /*
241                          * Allow only a single IBSS interface to be up at any
242                          * time. This is restricted because beacon distribution
243                          * cannot work properly if both are in the same IBSS.
244                          *
245                          * To remove this restriction we'd have to disallow them
246                          * from setting the same SSID on different IBSS interfaces
247                          * belonging to the same hardware. Then, however, we're
248                          * faced with having to adopt two different TSF timers...
249                          */
250                         if (iftype == NL80211_IFTYPE_ADHOC &&
251                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
252                                 return -EBUSY;
253
254                         /*
255                          * The remaining checks are only performed for interfaces
256                          * with the same MAC address.
257                          */
258                         if (!ether_addr_equal(sdata->vif.addr,
259                                               nsdata->vif.addr))
260                                 continue;
261
262                         /*
263                          * check whether it may have the same address
264                          */
265                         if (!identical_mac_addr_allowed(iftype,
266                                                         nsdata->vif.type))
267                                 return -ENOTUNIQ;
268
269                         /*
270                          * can only add VLANs to enabled APs
271                          */
272                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
273                             nsdata->vif.type == NL80211_IFTYPE_AP)
274                                 sdata->bss = &nsdata->u.ap;
275                 }
276         }
277
278         return 0;
279 }
280
281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
282 {
283         int n_queues = sdata->local->hw.queues;
284         int i;
285
286         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
287                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
288                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
289                                          IEEE80211_INVAL_HW_QUEUE))
290                                 return -EINVAL;
291                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
292                                          n_queues))
293                                 return -EINVAL;
294                 }
295         }
296
297         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
298              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
299             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
300                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
301                 return 0;
302         }
303
304         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
305                 return -EINVAL;
306
307         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
308                 return -EINVAL;
309
310         return 0;
311 }
312
313 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
314                                     const int offset)
315 {
316         struct ieee80211_local *local = sdata->local;
317         u32 flags = sdata->u.mntr_flags;
318
319 #define ADJUST(_f, _s)  do {                                    \
320         if (flags & MONITOR_FLAG_##_f)                          \
321                 local->fif_##_s += offset;                      \
322         } while (0)
323
324         ADJUST(FCSFAIL, fcsfail);
325         ADJUST(PLCPFAIL, plcpfail);
326         ADJUST(CONTROL, control);
327         ADJUST(CONTROL, pspoll);
328         ADJUST(OTHER_BSS, other_bss);
329
330 #undef ADJUST
331 }
332
333 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
334 {
335         struct ieee80211_local *local = sdata->local;
336         int i;
337
338         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
339                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
340                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
341                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
342                         sdata->vif.hw_queue[i] = i;
343                 else
344                         sdata->vif.hw_queue[i] = 0;
345         }
346         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
347 }
348
349 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
350 {
351         struct ieee80211_sub_if_data *sdata;
352         int ret = 0;
353
354         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
355                 return 0;
356
357         mutex_lock(&local->iflist_mtx);
358
359         if (local->monitor_sdata)
360                 goto out_unlock;
361
362         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
363         if (!sdata) {
364                 ret = -ENOMEM;
365                 goto out_unlock;
366         }
367
368         /* set up data */
369         sdata->local = local;
370         sdata->vif.type = NL80211_IFTYPE_MONITOR;
371         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
372                  wiphy_name(local->hw.wiphy));
373
374         ieee80211_set_default_queues(sdata);
375
376         ret = drv_add_interface(local, sdata);
377         if (WARN_ON(ret)) {
378                 /* ok .. stupid driver, it asked for this! */
379                 kfree(sdata);
380                 goto out_unlock;
381         }
382
383         ret = ieee80211_check_queues(sdata);
384         if (ret) {
385                 kfree(sdata);
386                 goto out_unlock;
387         }
388
389         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
390                                         IEEE80211_CHANCTX_EXCLUSIVE);
391         if (ret) {
392                 drv_remove_interface(local, sdata);
393                 kfree(sdata);
394                 goto out_unlock;
395         }
396
397         rcu_assign_pointer(local->monitor_sdata, sdata);
398  out_unlock:
399         mutex_unlock(&local->iflist_mtx);
400         return ret;
401 }
402
403 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
404 {
405         struct ieee80211_sub_if_data *sdata;
406
407         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
408                 return;
409
410         mutex_lock(&local->iflist_mtx);
411
412         sdata = rcu_dereference_protected(local->monitor_sdata,
413                                           lockdep_is_held(&local->iflist_mtx));
414         if (!sdata)
415                 goto out_unlock;
416
417         rcu_assign_pointer(local->monitor_sdata, NULL);
418         synchronize_net();
419
420         ieee80211_vif_release_channel(sdata);
421
422         drv_remove_interface(local, sdata);
423
424         kfree(sdata);
425  out_unlock:
426         mutex_unlock(&local->iflist_mtx);
427 }
428
429 /*
430  * NOTE: Be very careful when changing this function, it must NOT return
431  * an error on interface type changes that have been pre-checked, so most
432  * checks should be in ieee80211_check_concurrent_iface.
433  */
434 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
435 {
436         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
437         struct net_device *dev = wdev->netdev;
438         struct ieee80211_local *local = sdata->local;
439         struct sta_info *sta;
440         u32 changed = 0;
441         int res;
442         u32 hw_reconf_flags = 0;
443
444         switch (sdata->vif.type) {
445         case NL80211_IFTYPE_WDS:
446                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
447                         return -ENOLINK;
448                 break;
449         case NL80211_IFTYPE_AP_VLAN: {
450                 struct ieee80211_sub_if_data *master;
451
452                 if (!sdata->bss)
453                         return -ENOLINK;
454
455                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
456
457                 master = container_of(sdata->bss,
458                                       struct ieee80211_sub_if_data, u.ap);
459                 sdata->control_port_protocol =
460                         master->control_port_protocol;
461                 sdata->control_port_no_encrypt =
462                         master->control_port_no_encrypt;
463                 break;
464                 }
465         case NL80211_IFTYPE_AP:
466                 sdata->bss = &sdata->u.ap;
467                 break;
468         case NL80211_IFTYPE_MESH_POINT:
469         case NL80211_IFTYPE_STATION:
470         case NL80211_IFTYPE_MONITOR:
471         case NL80211_IFTYPE_ADHOC:
472         case NL80211_IFTYPE_P2P_DEVICE:
473                 /* no special treatment */
474                 break;
475         case NL80211_IFTYPE_UNSPECIFIED:
476         case NUM_NL80211_IFTYPES:
477         case NL80211_IFTYPE_P2P_CLIENT:
478         case NL80211_IFTYPE_P2P_GO:
479                 /* cannot happen */
480                 WARN_ON(1);
481                 break;
482         }
483
484         if (local->open_count == 0) {
485                 res = drv_start(local);
486                 if (res)
487                         goto err_del_bss;
488                 /* we're brought up, everything changes */
489                 hw_reconf_flags = ~0;
490                 ieee80211_led_radio(local, true);
491                 ieee80211_mod_tpt_led_trig(local,
492                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
493         }
494
495         /*
496          * Copy the hopefully now-present MAC address to
497          * this interface, if it has the special null one.
498          */
499         if (dev && is_zero_ether_addr(dev->dev_addr)) {
500                 memcpy(dev->dev_addr,
501                        local->hw.wiphy->perm_addr,
502                        ETH_ALEN);
503                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
504
505                 if (!is_valid_ether_addr(dev->dev_addr)) {
506                         res = -EADDRNOTAVAIL;
507                         goto err_stop;
508                 }
509         }
510
511         switch (sdata->vif.type) {
512         case NL80211_IFTYPE_AP_VLAN:
513                 /* no need to tell driver, but set carrier and chanctx */
514                 if (rtnl_dereference(sdata->bss->beacon)) {
515                         ieee80211_vif_vlan_copy_chanctx(sdata);
516                         netif_carrier_on(dev);
517                 } else {
518                         netif_carrier_off(dev);
519                 }
520                 break;
521         case NL80211_IFTYPE_MONITOR:
522                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
523                         local->cooked_mntrs++;
524                         break;
525                 }
526
527                 if (local->monitors == 0 && local->open_count == 0) {
528                         res = ieee80211_add_virtual_monitor(local);
529                         if (res)
530                                 goto err_stop;
531                 }
532
533                 /* must be before the call to ieee80211_configure_filter */
534                 local->monitors++;
535                 if (local->monitors == 1) {
536                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
537                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
538                 }
539
540                 ieee80211_adjust_monitor_flags(sdata, 1);
541                 ieee80211_configure_filter(local);
542                 mutex_lock(&local->mtx);
543                 ieee80211_recalc_idle(local);
544                 mutex_unlock(&local->mtx);
545
546                 netif_carrier_on(dev);
547                 break;
548         default:
549                 if (coming_up) {
550                         ieee80211_del_virtual_monitor(local);
551
552                         res = drv_add_interface(local, sdata);
553                         if (res)
554                                 goto err_stop;
555                         res = ieee80211_check_queues(sdata);
556                         if (res)
557                                 goto err_del_interface;
558                 }
559
560                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
561                         local->fif_pspoll++;
562                         local->fif_probe_req++;
563
564                         ieee80211_configure_filter(local);
565                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
566                         local->fif_probe_req++;
567                 }
568
569                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
570                         changed |= ieee80211_reset_erp_info(sdata);
571                 ieee80211_bss_info_change_notify(sdata, changed);
572
573                 switch (sdata->vif.type) {
574                 case NL80211_IFTYPE_STATION:
575                 case NL80211_IFTYPE_ADHOC:
576                 case NL80211_IFTYPE_AP:
577                 case NL80211_IFTYPE_MESH_POINT:
578                         netif_carrier_off(dev);
579                         break;
580                 case NL80211_IFTYPE_WDS:
581                 case NL80211_IFTYPE_P2P_DEVICE:
582                         break;
583                 default:
584                         netif_carrier_on(dev);
585                 }
586
587                 /*
588                  * set default queue parameters so drivers don't
589                  * need to initialise the hardware if the hardware
590                  * doesn't start up with sane defaults
591                  */
592                 ieee80211_set_wmm_default(sdata, true);
593         }
594
595         set_bit(SDATA_STATE_RUNNING, &sdata->state);
596
597         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
598                 /* Create STA entry for the WDS peer */
599                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
600                                      GFP_KERNEL);
601                 if (!sta) {
602                         res = -ENOMEM;
603                         goto err_del_interface;
604                 }
605
606                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
607                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
608                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
609
610                 res = sta_info_insert(sta);
611                 if (res) {
612                         /* STA has been freed */
613                         goto err_del_interface;
614                 }
615
616                 rate_control_rate_init(sta);
617                 netif_carrier_on(dev);
618         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
619                 rcu_assign_pointer(local->p2p_sdata, sdata);
620         }
621
622         /*
623          * set_multicast_list will be invoked by the networking core
624          * which will check whether any increments here were done in
625          * error and sync them down to the hardware as filter flags.
626          */
627         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
628                 atomic_inc(&local->iff_allmultis);
629
630         if (sdata->flags & IEEE80211_SDATA_PROMISC)
631                 atomic_inc(&local->iff_promiscs);
632
633         if (coming_up)
634                 local->open_count++;
635
636         if (hw_reconf_flags)
637                 ieee80211_hw_config(local, hw_reconf_flags);
638
639         ieee80211_recalc_ps(local, -1);
640
641         if (dev)
642                 netif_tx_start_all_queues(dev);
643
644         return 0;
645  err_del_interface:
646         drv_remove_interface(local, sdata);
647  err_stop:
648         if (!local->open_count)
649                 drv_stop(local);
650  err_del_bss:
651         sdata->bss = NULL;
652         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
653                 list_del(&sdata->u.vlan.list);
654         /* might already be clear but that doesn't matter */
655         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
656         return res;
657 }
658
659 static int ieee80211_open(struct net_device *dev)
660 {
661         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
662         int err;
663
664         /* fail early if user set an invalid address */
665         if (!is_valid_ether_addr(dev->dev_addr))
666                 return -EADDRNOTAVAIL;
667
668         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
669         if (err)
670                 return err;
671
672         return ieee80211_do_open(&sdata->wdev, true);
673 }
674
675 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
676                               bool going_down)
677 {
678         struct ieee80211_local *local = sdata->local;
679         unsigned long flags;
680         struct sk_buff *skb, *tmp;
681         u32 hw_reconf_flags = 0;
682         int i, flushed;
683         struct ps_data *ps;
684
685         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
686
687         if (rcu_access_pointer(local->scan_sdata) == sdata)
688                 ieee80211_scan_cancel(local);
689
690         /*
691          * Stop TX on this interface first.
692          */
693         if (sdata->dev)
694                 netif_tx_stop_all_queues(sdata->dev);
695
696         ieee80211_roc_purge(local, sdata);
697
698         if (sdata->vif.type == NL80211_IFTYPE_STATION)
699                 ieee80211_mgd_stop(sdata);
700
701         /*
702          * Remove all stations associated with this interface.
703          *
704          * This must be done before calling ops->remove_interface()
705          * because otherwise we can later invoke ops->sta_notify()
706          * whenever the STAs are removed, and that invalidates driver
707          * assumptions about always getting a vif pointer that is valid
708          * (because if we remove a STA after ops->remove_interface()
709          * the driver will have removed the vif info already!)
710          *
711          * This is relevant only in WDS mode, in all other modes we've
712          * already removed all stations when disconnecting or similar,
713          * so warn otherwise.
714          *
715          * We call sta_info_flush_cleanup() later, to combine RCU waits.
716          */
717         flushed = sta_info_flush_defer(sdata);
718         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
719                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
720
721         /* don't count this interface for promisc/allmulti while it is down */
722         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
723                 atomic_dec(&local->iff_allmultis);
724
725         if (sdata->flags & IEEE80211_SDATA_PROMISC)
726                 atomic_dec(&local->iff_promiscs);
727
728         if (sdata->vif.type == NL80211_IFTYPE_AP) {
729                 local->fif_pspoll--;
730                 local->fif_probe_req--;
731         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
732                 local->fif_probe_req--;
733         }
734
735         if (sdata->dev) {
736                 netif_addr_lock_bh(sdata->dev);
737                 spin_lock_bh(&local->filter_lock);
738                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
739                                  sdata->dev->addr_len);
740                 spin_unlock_bh(&local->filter_lock);
741                 netif_addr_unlock_bh(sdata->dev);
742
743                 ieee80211_configure_filter(local);
744         }
745
746         del_timer_sync(&local->dynamic_ps_timer);
747         cancel_work_sync(&local->dynamic_ps_enable_work);
748
749         cancel_work_sync(&sdata->recalc_smps);
750
751         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
752
753         if (sdata->wdev.cac_started) {
754                 mutex_lock(&local->iflist_mtx);
755                 ieee80211_vif_release_channel(sdata);
756                 mutex_unlock(&local->iflist_mtx);
757                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
758                                    GFP_KERNEL);
759         }
760
761         /* APs need special treatment */
762         if (sdata->vif.type == NL80211_IFTYPE_AP) {
763                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
764
765                 /* down all dependent devices, that is VLANs */
766                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
767                                          u.vlan.list)
768                         dev_close(vlan->dev);
769                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
770         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
771                 /* remove all packets in parent bc_buf pointing to this dev */
772                 ps = &sdata->bss->ps;
773
774                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
775                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
776                         if (skb->dev == sdata->dev) {
777                                 __skb_unlink(skb, &ps->bc_buf);
778                                 local->total_ps_buffered--;
779                                 ieee80211_free_txskb(&local->hw, skb);
780                         }
781                 }
782                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
783         }
784
785         if (going_down)
786                 local->open_count--;
787
788         switch (sdata->vif.type) {
789         case NL80211_IFTYPE_AP_VLAN:
790                 list_del(&sdata->u.vlan.list);
791                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
792                 /* no need to tell driver */
793                 break;
794         case NL80211_IFTYPE_MONITOR:
795                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
796                         local->cooked_mntrs--;
797                         break;
798                 }
799
800                 local->monitors--;
801                 if (local->monitors == 0) {
802                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
803                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
804                         ieee80211_del_virtual_monitor(local);
805                 }
806
807                 ieee80211_adjust_monitor_flags(sdata, -1);
808                 ieee80211_configure_filter(local);
809                 mutex_lock(&local->mtx);
810                 ieee80211_recalc_idle(local);
811                 mutex_unlock(&local->mtx);
812                 break;
813         case NL80211_IFTYPE_P2P_DEVICE:
814                 /* relies on synchronize_rcu() below */
815                 rcu_assign_pointer(local->p2p_sdata, NULL);
816                 /* fall through */
817         default:
818                 cancel_work_sync(&sdata->work);
819                 /*
820                  * When we get here, the interface is marked down.
821                  *
822                  * sta_info_flush_cleanup() requires rcu_barrier()
823                  * first to wait for the station call_rcu() calls
824                  * to complete, here we need at least sychronize_rcu()
825                  * it to wait for the RX path in case it is using the
826                  * interface and enqueuing frames at this very time on
827                  * another CPU.
828                  */
829                 rcu_barrier();
830                 sta_info_flush_cleanup(sdata);
831
832                 /*
833                  * Free all remaining keys, there shouldn't be any,
834                  * except maybe in WDS mode?
835                  */
836                 ieee80211_free_keys(sdata);
837
838                 /* fall through */
839         case NL80211_IFTYPE_AP:
840                 skb_queue_purge(&sdata->skb_queue);
841
842                 if (going_down)
843                         drv_remove_interface(local, sdata);
844         }
845
846         sdata->bss = NULL;
847
848         ieee80211_recalc_ps(local, -1);
849
850         if (local->open_count == 0) {
851                 ieee80211_clear_tx_pending(local);
852                 ieee80211_stop_device(local);
853
854                 /* no reconfiguring after stop! */
855                 hw_reconf_flags = 0;
856         }
857
858         /* do after stop to avoid reconfiguring when we stop anyway */
859         if (hw_reconf_flags)
860                 ieee80211_hw_config(local, hw_reconf_flags);
861
862         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
863         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
864                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
865                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
866                         if (info->control.vif == &sdata->vif) {
867                                 __skb_unlink(skb, &local->pending[i]);
868                                 ieee80211_free_txskb(&local->hw, skb);
869                         }
870                 }
871         }
872         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
873
874         if (local->monitors == local->open_count && local->monitors > 0)
875                 ieee80211_add_virtual_monitor(local);
876 }
877
878 static int ieee80211_stop(struct net_device *dev)
879 {
880         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
881
882         ieee80211_do_stop(sdata, true);
883
884         return 0;
885 }
886
887 static void ieee80211_set_multicast_list(struct net_device *dev)
888 {
889         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
890         struct ieee80211_local *local = sdata->local;
891         int allmulti, promisc, sdata_allmulti, sdata_promisc;
892
893         allmulti = !!(dev->flags & IFF_ALLMULTI);
894         promisc = !!(dev->flags & IFF_PROMISC);
895         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
896         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
897
898         if (allmulti != sdata_allmulti) {
899                 if (dev->flags & IFF_ALLMULTI)
900                         atomic_inc(&local->iff_allmultis);
901                 else
902                         atomic_dec(&local->iff_allmultis);
903                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
904         }
905
906         if (promisc != sdata_promisc) {
907                 if (dev->flags & IFF_PROMISC)
908                         atomic_inc(&local->iff_promiscs);
909                 else
910                         atomic_dec(&local->iff_promiscs);
911                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
912         }
913
914         /*
915          * TODO: If somebody needs this on AP interfaces,
916          *       it can be enabled easily but multicast
917          *       addresses from VLANs need to be synced.
918          */
919         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
920             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
921             sdata->vif.type != NL80211_IFTYPE_AP)
922                 drv_set_multicast_list(local, sdata, &dev->mc);
923
924         spin_lock_bh(&local->filter_lock);
925         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
926         spin_unlock_bh(&local->filter_lock);
927         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
928 }
929
930 /*
931  * Called when the netdev is removed or, by the code below, before
932  * the interface type changes.
933  */
934 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
935 {
936         int flushed;
937         int i;
938
939         /* free extra data */
940         ieee80211_free_keys(sdata);
941
942         ieee80211_debugfs_remove_netdev(sdata);
943
944         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
945                 __skb_queue_purge(&sdata->fragments[i].skb_list);
946         sdata->fragment_next = 0;
947
948         if (ieee80211_vif_is_mesh(&sdata->vif))
949                 mesh_rmc_free(sdata);
950
951         flushed = sta_info_flush(sdata);
952         WARN_ON(flushed);
953 }
954
955 static void ieee80211_uninit(struct net_device *dev)
956 {
957         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
958 }
959
960 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
961                                          struct sk_buff *skb)
962 {
963         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
964 }
965
966 static const struct net_device_ops ieee80211_dataif_ops = {
967         .ndo_open               = ieee80211_open,
968         .ndo_stop               = ieee80211_stop,
969         .ndo_uninit             = ieee80211_uninit,
970         .ndo_start_xmit         = ieee80211_subif_start_xmit,
971         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
972         .ndo_change_mtu         = ieee80211_change_mtu,
973         .ndo_set_mac_address    = ieee80211_change_mac,
974         .ndo_select_queue       = ieee80211_netdev_select_queue,
975 };
976
977 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
978                                           struct sk_buff *skb)
979 {
980         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
981         struct ieee80211_local *local = sdata->local;
982         struct ieee80211_hdr *hdr;
983         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
984
985         if (local->hw.queues < IEEE80211_NUM_ACS)
986                 return 0;
987
988         if (skb->len < 4 ||
989             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
990                 return 0; /* doesn't matter, frame will be dropped */
991
992         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
993
994         return ieee80211_select_queue_80211(sdata, skb, hdr);
995 }
996
997 static const struct net_device_ops ieee80211_monitorif_ops = {
998         .ndo_open               = ieee80211_open,
999         .ndo_stop               = ieee80211_stop,
1000         .ndo_uninit             = ieee80211_uninit,
1001         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1002         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1003         .ndo_change_mtu         = ieee80211_change_mtu,
1004         .ndo_set_mac_address    = eth_mac_addr,
1005         .ndo_select_queue       = ieee80211_monitor_select_queue,
1006 };
1007
1008 static void ieee80211_if_setup(struct net_device *dev)
1009 {
1010         ether_setup(dev);
1011         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1012         dev->netdev_ops = &ieee80211_dataif_ops;
1013         dev->destructor = free_netdev;
1014 }
1015
1016 static void ieee80211_iface_work(struct work_struct *work)
1017 {
1018         struct ieee80211_sub_if_data *sdata =
1019                 container_of(work, struct ieee80211_sub_if_data, work);
1020         struct ieee80211_local *local = sdata->local;
1021         struct sk_buff *skb;
1022         struct sta_info *sta;
1023         struct ieee80211_ra_tid *ra_tid;
1024
1025         if (!ieee80211_sdata_running(sdata))
1026                 return;
1027
1028         if (local->scanning)
1029                 return;
1030
1031         /*
1032          * ieee80211_queue_work() should have picked up most cases,
1033          * here we'll pick the rest.
1034          */
1035         if (WARN(local->suspended,
1036                  "interface work scheduled while going to suspend\n"))
1037                 return;
1038
1039         /* first process frames */
1040         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1041                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1042
1043                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1044                         ra_tid = (void *)&skb->cb;
1045                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1046                                                  ra_tid->tid);
1047                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1048                         ra_tid = (void *)&skb->cb;
1049                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1050                                                 ra_tid->tid);
1051                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1052                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1053                         int len = skb->len;
1054
1055                         mutex_lock(&local->sta_mtx);
1056                         sta = sta_info_get_bss(sdata, mgmt->sa);
1057                         if (sta) {
1058                                 switch (mgmt->u.action.u.addba_req.action_code) {
1059                                 case WLAN_ACTION_ADDBA_REQ:
1060                                         ieee80211_process_addba_request(
1061                                                         local, sta, mgmt, len);
1062                                         break;
1063                                 case WLAN_ACTION_ADDBA_RESP:
1064                                         ieee80211_process_addba_resp(local, sta,
1065                                                                      mgmt, len);
1066                                         break;
1067                                 case WLAN_ACTION_DELBA:
1068                                         ieee80211_process_delba(sdata, sta,
1069                                                                 mgmt, len);
1070                                         break;
1071                                 default:
1072                                         WARN_ON(1);
1073                                         break;
1074                                 }
1075                         }
1076                         mutex_unlock(&local->sta_mtx);
1077                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1078                         struct ieee80211_hdr *hdr = (void *)mgmt;
1079                         /*
1080                          * So the frame isn't mgmt, but frame_control
1081                          * is at the right place anyway, of course, so
1082                          * the if statement is correct.
1083                          *
1084                          * Warn if we have other data frame types here,
1085                          * they must not get here.
1086                          */
1087                         WARN_ON(hdr->frame_control &
1088                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1089                         WARN_ON(!(hdr->seq_ctrl &
1090                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1091                         /*
1092                          * This was a fragment of a frame, received while
1093                          * a block-ack session was active. That cannot be
1094                          * right, so terminate the session.
1095                          */
1096                         mutex_lock(&local->sta_mtx);
1097                         sta = sta_info_get_bss(sdata, mgmt->sa);
1098                         if (sta) {
1099                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1100                                                 IEEE80211_QOS_CTL_TID_MASK;
1101
1102                                 __ieee80211_stop_rx_ba_session(
1103                                         sta, tid, WLAN_BACK_RECIPIENT,
1104                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1105                                         true);
1106                         }
1107                         mutex_unlock(&local->sta_mtx);
1108                 } else switch (sdata->vif.type) {
1109                 case NL80211_IFTYPE_STATION:
1110                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1111                         break;
1112                 case NL80211_IFTYPE_ADHOC:
1113                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1114                         break;
1115                 case NL80211_IFTYPE_MESH_POINT:
1116                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1117                                 break;
1118                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1119                         break;
1120                 default:
1121                         WARN(1, "frame for unexpected interface type");
1122                         break;
1123                 }
1124
1125                 kfree_skb(skb);
1126         }
1127
1128         /* then other type-dependent work */
1129         switch (sdata->vif.type) {
1130         case NL80211_IFTYPE_STATION:
1131                 ieee80211_sta_work(sdata);
1132                 break;
1133         case NL80211_IFTYPE_ADHOC:
1134                 ieee80211_ibss_work(sdata);
1135                 break;
1136         case NL80211_IFTYPE_MESH_POINT:
1137                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1138                         break;
1139                 ieee80211_mesh_work(sdata);
1140                 break;
1141         default:
1142                 break;
1143         }
1144 }
1145
1146 static void ieee80211_recalc_smps_work(struct work_struct *work)
1147 {
1148         struct ieee80211_sub_if_data *sdata =
1149                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1150
1151         ieee80211_recalc_smps(sdata);
1152 }
1153
1154 /*
1155  * Helper function to initialise an interface to a specific type.
1156  */
1157 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1158                                   enum nl80211_iftype type)
1159 {
1160         /* clear type-dependent union */
1161         memset(&sdata->u, 0, sizeof(sdata->u));
1162
1163         /* and set some type-dependent values */
1164         sdata->vif.type = type;
1165         sdata->vif.p2p = false;
1166         sdata->wdev.iftype = type;
1167
1168         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1169         sdata->control_port_no_encrypt = false;
1170
1171         sdata->noack_map = 0;
1172
1173         /* only monitor/p2p-device differ */
1174         if (sdata->dev) {
1175                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1176                 sdata->dev->type = ARPHRD_ETHER;
1177         }
1178
1179         skb_queue_head_init(&sdata->skb_queue);
1180         INIT_WORK(&sdata->work, ieee80211_iface_work);
1181         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1182
1183         switch (type) {
1184         case NL80211_IFTYPE_P2P_GO:
1185                 type = NL80211_IFTYPE_AP;
1186                 sdata->vif.type = type;
1187                 sdata->vif.p2p = true;
1188                 /* fall through */
1189         case NL80211_IFTYPE_AP:
1190                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1191                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1192                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1193                 break;
1194         case NL80211_IFTYPE_P2P_CLIENT:
1195                 type = NL80211_IFTYPE_STATION;
1196                 sdata->vif.type = type;
1197                 sdata->vif.p2p = true;
1198                 /* fall through */
1199         case NL80211_IFTYPE_STATION:
1200                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1201                 ieee80211_sta_setup_sdata(sdata);
1202                 break;
1203         case NL80211_IFTYPE_ADHOC:
1204                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1205                 ieee80211_ibss_setup_sdata(sdata);
1206                 break;
1207         case NL80211_IFTYPE_MESH_POINT:
1208                 if (ieee80211_vif_is_mesh(&sdata->vif))
1209                         ieee80211_mesh_init_sdata(sdata);
1210                 break;
1211         case NL80211_IFTYPE_MONITOR:
1212                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1213                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1214                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1215                                       MONITOR_FLAG_OTHER_BSS;
1216                 break;
1217         case NL80211_IFTYPE_WDS:
1218                 sdata->vif.bss_conf.bssid = NULL;
1219                 break;
1220         case NL80211_IFTYPE_AP_VLAN:
1221                 break;
1222         case NL80211_IFTYPE_P2P_DEVICE:
1223                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1224                 break;
1225         case NL80211_IFTYPE_UNSPECIFIED:
1226         case NUM_NL80211_IFTYPES:
1227                 BUG();
1228                 break;
1229         }
1230
1231         ieee80211_debugfs_add_netdev(sdata);
1232 }
1233
1234 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1235                                            enum nl80211_iftype type)
1236 {
1237         struct ieee80211_local *local = sdata->local;
1238         int ret, err;
1239         enum nl80211_iftype internal_type = type;
1240         bool p2p = false;
1241
1242         ASSERT_RTNL();
1243
1244         if (!local->ops->change_interface)
1245                 return -EBUSY;
1246
1247         switch (sdata->vif.type) {
1248         case NL80211_IFTYPE_AP:
1249         case NL80211_IFTYPE_STATION:
1250         case NL80211_IFTYPE_ADHOC:
1251                 /*
1252                  * Could maybe also all others here?
1253                  * Just not sure how that interacts
1254                  * with the RX/config path e.g. for
1255                  * mesh.
1256                  */
1257                 break;
1258         default:
1259                 return -EBUSY;
1260         }
1261
1262         switch (type) {
1263         case NL80211_IFTYPE_AP:
1264         case NL80211_IFTYPE_STATION:
1265         case NL80211_IFTYPE_ADHOC:
1266                 /*
1267                  * Could probably support everything
1268                  * but WDS here (WDS do_open can fail
1269                  * under memory pressure, which this
1270                  * code isn't prepared to handle).
1271                  */
1272                 break;
1273         case NL80211_IFTYPE_P2P_CLIENT:
1274                 p2p = true;
1275                 internal_type = NL80211_IFTYPE_STATION;
1276                 break;
1277         case NL80211_IFTYPE_P2P_GO:
1278                 p2p = true;
1279                 internal_type = NL80211_IFTYPE_AP;
1280                 break;
1281         default:
1282                 return -EBUSY;
1283         }
1284
1285         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1286         if (ret)
1287                 return ret;
1288
1289         ieee80211_do_stop(sdata, false);
1290
1291         ieee80211_teardown_sdata(sdata);
1292
1293         ret = drv_change_interface(local, sdata, internal_type, p2p);
1294         if (ret)
1295                 type = sdata->vif.type;
1296
1297         /*
1298          * Ignore return value here, there's not much we can do since
1299          * the driver changed the interface type internally already.
1300          * The warnings will hopefully make driver authors fix it :-)
1301          */
1302         ieee80211_check_queues(sdata);
1303
1304         ieee80211_setup_sdata(sdata, type);
1305
1306         err = ieee80211_do_open(&sdata->wdev, false);
1307         WARN(err, "type change: do_open returned %d", err);
1308
1309         return ret;
1310 }
1311
1312 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1313                              enum nl80211_iftype type)
1314 {
1315         int ret;
1316
1317         ASSERT_RTNL();
1318
1319         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1320                 return 0;
1321
1322         if (ieee80211_sdata_running(sdata)) {
1323                 ret = ieee80211_runtime_change_iftype(sdata, type);
1324                 if (ret)
1325                         return ret;
1326         } else {
1327                 /* Purge and reset type-dependent state. */
1328                 ieee80211_teardown_sdata(sdata);
1329                 ieee80211_setup_sdata(sdata, type);
1330         }
1331
1332         /* reset some values that shouldn't be kept across type changes */
1333         sdata->drop_unencrypted = 0;
1334         if (type == NL80211_IFTYPE_STATION)
1335                 sdata->u.mgd.use_4addr = false;
1336
1337         return 0;
1338 }
1339
1340 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1341                                        u8 *perm_addr, enum nl80211_iftype type)
1342 {
1343         struct ieee80211_sub_if_data *sdata;
1344         u64 mask, start, addr, val, inc;
1345         u8 *m;
1346         u8 tmp_addr[ETH_ALEN];
1347         int i;
1348
1349         /* default ... something at least */
1350         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1351
1352         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1353             local->hw.wiphy->n_addresses <= 1)
1354                 return;
1355
1356         mutex_lock(&local->iflist_mtx);
1357
1358         switch (type) {
1359         case NL80211_IFTYPE_MONITOR:
1360                 /* doesn't matter */
1361                 break;
1362         case NL80211_IFTYPE_WDS:
1363         case NL80211_IFTYPE_AP_VLAN:
1364                 /* match up with an AP interface */
1365                 list_for_each_entry(sdata, &local->interfaces, list) {
1366                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1367                                 continue;
1368                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1369                         break;
1370                 }
1371                 /* keep default if no AP interface present */
1372                 break;
1373         case NL80211_IFTYPE_P2P_CLIENT:
1374         case NL80211_IFTYPE_P2P_GO:
1375                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1376                         list_for_each_entry(sdata, &local->interfaces, list) {
1377                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1378                                         continue;
1379                                 if (!ieee80211_sdata_running(sdata))
1380                                         continue;
1381                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1382                                 goto out_unlock;
1383                         }
1384                 }
1385                 /* otherwise fall through */
1386         default:
1387                 /* assign a new address if possible -- try n_addresses first */
1388                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1389                         bool used = false;
1390
1391                         list_for_each_entry(sdata, &local->interfaces, list) {
1392                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1393                                            sdata->vif.addr, ETH_ALEN) == 0) {
1394                                         used = true;
1395                                         break;
1396                                 }
1397                         }
1398
1399                         if (!used) {
1400                                 memcpy(perm_addr,
1401                                        local->hw.wiphy->addresses[i].addr,
1402                                        ETH_ALEN);
1403                                 break;
1404                         }
1405                 }
1406
1407                 /* try mask if available */
1408                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1409                         break;
1410
1411                 m = local->hw.wiphy->addr_mask;
1412                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1413                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1414                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1415
1416                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1417                         /* not a contiguous mask ... not handled now! */
1418                         pr_info("not contiguous\n");
1419                         break;
1420                 }
1421
1422                 m = local->hw.wiphy->perm_addr;
1423                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1424                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1425                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1426
1427                 inc = 1ULL<<__ffs64(mask);
1428                 val = (start & mask);
1429                 addr = (start & ~mask) | (val & mask);
1430                 do {
1431                         bool used = false;
1432
1433                         tmp_addr[5] = addr >> 0*8;
1434                         tmp_addr[4] = addr >> 1*8;
1435                         tmp_addr[3] = addr >> 2*8;
1436                         tmp_addr[2] = addr >> 3*8;
1437                         tmp_addr[1] = addr >> 4*8;
1438                         tmp_addr[0] = addr >> 5*8;
1439
1440                         val += inc;
1441
1442                         list_for_each_entry(sdata, &local->interfaces, list) {
1443                                 if (memcmp(tmp_addr, sdata->vif.addr,
1444                                                         ETH_ALEN) == 0) {
1445                                         used = true;
1446                                         break;
1447                                 }
1448                         }
1449
1450                         if (!used) {
1451                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1452                                 break;
1453                         }
1454                         addr = (start & ~mask) | (val & mask);
1455                 } while (addr != start);
1456
1457                 break;
1458         }
1459
1460  out_unlock:
1461         mutex_unlock(&local->iflist_mtx);
1462 }
1463
1464 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1465 {
1466         struct ieee80211_sub_if_data *sdata;
1467
1468         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1469
1470         ieee80211_cleanup_sdata_stas(sdata);
1471 }
1472
1473 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1474                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1475                      struct vif_params *params)
1476 {
1477         struct net_device *ndev = NULL;
1478         struct ieee80211_sub_if_data *sdata = NULL;
1479         int ret, i;
1480         int txqs = 1;
1481
1482         ASSERT_RTNL();
1483
1484         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1485                 struct wireless_dev *wdev;
1486
1487                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1488                                 GFP_KERNEL);
1489                 if (!sdata)
1490                         return -ENOMEM;
1491                 wdev = &sdata->wdev;
1492
1493                 sdata->dev = NULL;
1494                 strlcpy(sdata->name, name, IFNAMSIZ);
1495                 ieee80211_assign_perm_addr(local, wdev->address, type);
1496                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1497         } else {
1498                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1499                         txqs = IEEE80211_NUM_ACS;
1500
1501                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1502                                         local->hw.vif_data_size,
1503                                         name, ieee80211_if_setup, txqs, 1);
1504                 if (!ndev)
1505                         return -ENOMEM;
1506                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1507
1508                 ndev->needed_headroom = local->tx_headroom +
1509                                         4*6 /* four MAC addresses */
1510                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1511                                         + 6 /* mesh */
1512                                         + 8 /* rfc1042/bridge tunnel */
1513                                         - ETH_HLEN /* ethernet hard_header_len */
1514                                         + IEEE80211_ENCRYPT_HEADROOM;
1515                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1516
1517                 ret = dev_alloc_name(ndev, ndev->name);
1518                 if (ret < 0) {
1519                         free_netdev(ndev);
1520                         return ret;
1521                 }
1522
1523                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1524                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1525                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1526
1527                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1528                 sdata = netdev_priv(ndev);
1529                 ndev->ieee80211_ptr = &sdata->wdev;
1530                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1531                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1532
1533                 sdata->dev = ndev;
1534         }
1535
1536         /* initialise type-independent data */
1537         sdata->wdev.wiphy = local->hw.wiphy;
1538         sdata->local = local;
1539
1540         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1541                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1542
1543         INIT_LIST_HEAD(&sdata->key_list);
1544
1545         spin_lock_init(&sdata->cleanup_stations_lock);
1546         INIT_LIST_HEAD(&sdata->cleanup_stations);
1547         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1548         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1549                           ieee80211_dfs_cac_timer_work);
1550         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1551                           ieee80211_delayed_tailroom_dec);
1552
1553         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1554                 struct ieee80211_supported_band *sband;
1555                 sband = local->hw.wiphy->bands[i];
1556                 sdata->rc_rateidx_mask[i] =
1557                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1558                 if (sband)
1559                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1560                                sband->ht_cap.mcs.rx_mask,
1561                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1562                 else
1563                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1564                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1565         }
1566
1567         ieee80211_set_default_queues(sdata);
1568
1569         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1570         sdata->user_power_level = local->user_power_level;
1571
1572         /* setup type-dependent data */
1573         ieee80211_setup_sdata(sdata, type);
1574
1575         if (ndev) {
1576                 if (params) {
1577                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1578                         if (type == NL80211_IFTYPE_STATION)
1579                                 sdata->u.mgd.use_4addr = params->use_4addr;
1580                 }
1581
1582                 ndev->features |= local->hw.netdev_features;
1583
1584                 ret = register_netdevice(ndev);
1585                 if (ret) {
1586                         free_netdev(ndev);
1587                         return ret;
1588                 }
1589         }
1590
1591         mutex_lock(&local->iflist_mtx);
1592         list_add_tail_rcu(&sdata->list, &local->interfaces);
1593         mutex_unlock(&local->iflist_mtx);
1594
1595         if (new_wdev)
1596                 *new_wdev = &sdata->wdev;
1597
1598         return 0;
1599 }
1600
1601 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1602 {
1603         ASSERT_RTNL();
1604
1605         mutex_lock(&sdata->local->iflist_mtx);
1606         list_del_rcu(&sdata->list);
1607         mutex_unlock(&sdata->local->iflist_mtx);
1608
1609         synchronize_rcu();
1610
1611         if (sdata->dev) {
1612                 unregister_netdevice(sdata->dev);
1613         } else {
1614                 cfg80211_unregister_wdev(&sdata->wdev);
1615                 kfree(sdata);
1616         }
1617 }
1618
1619 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1620 {
1621         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1622                 return;
1623         ieee80211_do_stop(sdata, true);
1624         ieee80211_teardown_sdata(sdata);
1625 }
1626
1627 /*
1628  * Remove all interfaces, may only be called at hardware unregistration
1629  * time because it doesn't do RCU-safe list removals.
1630  */
1631 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1632 {
1633         struct ieee80211_sub_if_data *sdata, *tmp;
1634         LIST_HEAD(unreg_list);
1635         LIST_HEAD(wdev_list);
1636
1637         ASSERT_RTNL();
1638
1639         mutex_lock(&local->iflist_mtx);
1640         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1641                 list_del(&sdata->list);
1642
1643                 if (sdata->dev)
1644                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1645                 else
1646                         list_add(&sdata->list, &wdev_list);
1647         }
1648         mutex_unlock(&local->iflist_mtx);
1649         unregister_netdevice_many(&unreg_list);
1650         list_del(&unreg_list);
1651
1652         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1653                 list_del(&sdata->list);
1654                 cfg80211_unregister_wdev(&sdata->wdev);
1655                 kfree(sdata);
1656         }
1657 }
1658
1659 static int netdev_notify(struct notifier_block *nb,
1660                          unsigned long state,
1661                          void *ndev)
1662 {
1663         struct net_device *dev = ndev;
1664         struct ieee80211_sub_if_data *sdata;
1665
1666         if (state != NETDEV_CHANGENAME)
1667                 return 0;
1668
1669         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1670                 return 0;
1671
1672         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1673                 return 0;
1674
1675         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1676
1677         memcpy(sdata->name, dev->name, IFNAMSIZ);
1678
1679         ieee80211_debugfs_rename_netdev(sdata);
1680         return 0;
1681 }
1682
1683 static struct notifier_block mac80211_netdev_notifier = {
1684         .notifier_call = netdev_notify,
1685 };
1686
1687 int ieee80211_iface_init(void)
1688 {
1689         return register_netdevice_notifier(&mac80211_netdev_notifier);
1690 }
1691
1692 void ieee80211_iface_exit(void)
1693 {
1694         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1695 }