mac80211: defer tailroom counter manipulation when roaming
[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 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         drv_flush(local, false);
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 static 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 static 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                 drv_add_interface_debugfs(local, sdata);
561
562                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
563                         local->fif_pspoll++;
564                         local->fif_probe_req++;
565
566                         ieee80211_configure_filter(local);
567                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
568                         local->fif_probe_req++;
569                 }
570
571                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
572                         changed |= ieee80211_reset_erp_info(sdata);
573                 ieee80211_bss_info_change_notify(sdata, changed);
574
575                 switch (sdata->vif.type) {
576                 case NL80211_IFTYPE_STATION:
577                 case NL80211_IFTYPE_ADHOC:
578                 case NL80211_IFTYPE_AP:
579                 case NL80211_IFTYPE_MESH_POINT:
580                         netif_carrier_off(dev);
581                         break;
582                 case NL80211_IFTYPE_WDS:
583                 case NL80211_IFTYPE_P2P_DEVICE:
584                         break;
585                 default:
586                         netif_carrier_on(dev);
587                 }
588
589                 /*
590                  * set default queue parameters so drivers don't
591                  * need to initialise the hardware if the hardware
592                  * doesn't start up with sane defaults
593                  */
594                 ieee80211_set_wmm_default(sdata, true);
595         }
596
597         set_bit(SDATA_STATE_RUNNING, &sdata->state);
598
599         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
600                 /* Create STA entry for the WDS peer */
601                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
602                                      GFP_KERNEL);
603                 if (!sta) {
604                         res = -ENOMEM;
605                         goto err_del_interface;
606                 }
607
608                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
609                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
610                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
611
612                 res = sta_info_insert(sta);
613                 if (res) {
614                         /* STA has been freed */
615                         goto err_del_interface;
616                 }
617
618                 rate_control_rate_init(sta);
619                 netif_carrier_on(dev);
620         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
621                 rcu_assign_pointer(local->p2p_sdata, sdata);
622         }
623
624         /*
625          * set_multicast_list will be invoked by the networking core
626          * which will check whether any increments here were done in
627          * error and sync them down to the hardware as filter flags.
628          */
629         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
630                 atomic_inc(&local->iff_allmultis);
631
632         if (sdata->flags & IEEE80211_SDATA_PROMISC)
633                 atomic_inc(&local->iff_promiscs);
634
635         if (coming_up)
636                 local->open_count++;
637
638         if (hw_reconf_flags)
639                 ieee80211_hw_config(local, hw_reconf_flags);
640
641         ieee80211_recalc_ps(local, -1);
642
643         if (dev)
644                 netif_tx_start_all_queues(dev);
645
646         return 0;
647  err_del_interface:
648         drv_remove_interface(local, sdata);
649  err_stop:
650         if (!local->open_count)
651                 drv_stop(local);
652  err_del_bss:
653         sdata->bss = NULL;
654         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
655                 list_del(&sdata->u.vlan.list);
656         /* might already be clear but that doesn't matter */
657         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
658         return res;
659 }
660
661 static int ieee80211_open(struct net_device *dev)
662 {
663         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
664         int err;
665
666         /* fail early if user set an invalid address */
667         if (!is_valid_ether_addr(dev->dev_addr))
668                 return -EADDRNOTAVAIL;
669
670         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
671         if (err)
672                 return err;
673
674         return ieee80211_do_open(&sdata->wdev, true);
675 }
676
677 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
678                               bool going_down)
679 {
680         struct ieee80211_local *local = sdata->local;
681         unsigned long flags;
682         struct sk_buff *skb, *tmp;
683         u32 hw_reconf_flags = 0;
684         int i, flushed;
685         struct ps_data *ps;
686
687         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
688
689         if (rcu_access_pointer(local->scan_sdata) == sdata)
690                 ieee80211_scan_cancel(local);
691
692         /*
693          * Stop TX on this interface first.
694          */
695         if (sdata->dev)
696                 netif_tx_stop_all_queues(sdata->dev);
697
698         ieee80211_roc_purge(sdata);
699
700         if (sdata->vif.type == NL80211_IFTYPE_STATION)
701                 ieee80211_mgd_stop(sdata);
702
703         /*
704          * Remove all stations associated with this interface.
705          *
706          * This must be done before calling ops->remove_interface()
707          * because otherwise we can later invoke ops->sta_notify()
708          * whenever the STAs are removed, and that invalidates driver
709          * assumptions about always getting a vif pointer that is valid
710          * (because if we remove a STA after ops->remove_interface()
711          * the driver will have removed the vif info already!)
712          *
713          * This is relevant only in WDS mode, in all other modes we've
714          * already removed all stations when disconnecting or similar,
715          * so warn otherwise.
716          *
717          * We call sta_info_flush_cleanup() later, to combine RCU waits.
718          */
719         flushed = sta_info_flush_defer(sdata);
720         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
721                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
722
723         /*
724          * Don't count this interface for promisc/allmulti while it
725          * is down. dev_mc_unsync() will invoke set_multicast_list
726          * on the master interface which will sync these down to the
727          * hardware as filter flags.
728          */
729         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
730                 atomic_dec(&local->iff_allmultis);
731
732         if (sdata->flags & IEEE80211_SDATA_PROMISC)
733                 atomic_dec(&local->iff_promiscs);
734
735         if (sdata->vif.type == NL80211_IFTYPE_AP) {
736                 local->fif_pspoll--;
737                 local->fif_probe_req--;
738         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
739                 local->fif_probe_req--;
740         }
741
742         if (sdata->dev) {
743                 netif_addr_lock_bh(sdata->dev);
744                 spin_lock_bh(&local->filter_lock);
745                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
746                                  sdata->dev->addr_len);
747                 spin_unlock_bh(&local->filter_lock);
748                 netif_addr_unlock_bh(sdata->dev);
749
750                 ieee80211_configure_filter(local);
751         }
752
753         del_timer_sync(&local->dynamic_ps_timer);
754         cancel_work_sync(&local->dynamic_ps_enable_work);
755
756         cancel_work_sync(&sdata->recalc_smps);
757
758         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
759
760         if (sdata->wdev.cac_started) {
761                 mutex_lock(&local->iflist_mtx);
762                 ieee80211_vif_release_channel(sdata);
763                 mutex_unlock(&local->iflist_mtx);
764                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
765                                    GFP_KERNEL);
766         }
767
768         /* APs need special treatment */
769         if (sdata->vif.type == NL80211_IFTYPE_AP) {
770                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
771
772                 /* down all dependent devices, that is VLANs */
773                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
774                                          u.vlan.list)
775                         dev_close(vlan->dev);
776                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
777         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
778                 /* remove all packets in parent bc_buf pointing to this dev */
779                 ps = &sdata->bss->ps;
780
781                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
782                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
783                         if (skb->dev == sdata->dev) {
784                                 __skb_unlink(skb, &ps->bc_buf);
785                                 local->total_ps_buffered--;
786                                 ieee80211_free_txskb(&local->hw, skb);
787                         }
788                 }
789                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
790         }
791
792         if (going_down)
793                 local->open_count--;
794
795         switch (sdata->vif.type) {
796         case NL80211_IFTYPE_AP_VLAN:
797                 list_del(&sdata->u.vlan.list);
798                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
799                 /* no need to tell driver */
800                 break;
801         case NL80211_IFTYPE_MONITOR:
802                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
803                         local->cooked_mntrs--;
804                         break;
805                 }
806
807                 local->monitors--;
808                 if (local->monitors == 0) {
809                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
810                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
811                         ieee80211_del_virtual_monitor(local);
812                 }
813
814                 ieee80211_adjust_monitor_flags(sdata, -1);
815                 ieee80211_configure_filter(local);
816                 mutex_lock(&local->mtx);
817                 ieee80211_recalc_idle(local);
818                 mutex_unlock(&local->mtx);
819                 break;
820         case NL80211_IFTYPE_P2P_DEVICE:
821                 /* relies on synchronize_rcu() below */
822                 rcu_assign_pointer(local->p2p_sdata, NULL);
823                 /* fall through */
824         default:
825                 cancel_work_sync(&sdata->work);
826                 /*
827                  * When we get here, the interface is marked down.
828                  *
829                  * sta_info_flush_cleanup() requires rcu_barrier()
830                  * first to wait for the station call_rcu() calls
831                  * to complete, here we need at least sychronize_rcu()
832                  * it to wait for the RX path in case it is using the
833                  * interface and enqueuing frames at this very time on
834                  * another CPU.
835                  */
836                 rcu_barrier();
837                 sta_info_flush_cleanup(sdata);
838
839                 skb_queue_purge(&sdata->skb_queue);
840
841                 /*
842                  * Free all remaining keys, there shouldn't be any,
843                  * except maybe group keys in AP more or WDS?
844                  */
845                 ieee80211_free_keys(sdata);
846
847                 drv_remove_interface_debugfs(local, sdata);
848
849                 if (going_down)
850                         drv_remove_interface(local, sdata);
851         }
852
853         sdata->bss = NULL;
854
855         ieee80211_recalc_ps(local, -1);
856
857         if (local->open_count == 0) {
858                 ieee80211_clear_tx_pending(local);
859                 ieee80211_stop_device(local);
860
861                 /* no reconfiguring after stop! */
862                 hw_reconf_flags = 0;
863         }
864
865         /* do after stop to avoid reconfiguring when we stop anyway */
866         if (hw_reconf_flags)
867                 ieee80211_hw_config(local, hw_reconf_flags);
868
869         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
870         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
871                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
872                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
873                         if (info->control.vif == &sdata->vif) {
874                                 __skb_unlink(skb, &local->pending[i]);
875                                 ieee80211_free_txskb(&local->hw, skb);
876                         }
877                 }
878         }
879         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
880
881         if (local->monitors == local->open_count && local->monitors > 0)
882                 ieee80211_add_virtual_monitor(local);
883 }
884
885 static int ieee80211_stop(struct net_device *dev)
886 {
887         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
888
889         ieee80211_do_stop(sdata, true);
890
891         return 0;
892 }
893
894 static void ieee80211_set_multicast_list(struct net_device *dev)
895 {
896         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
897         struct ieee80211_local *local = sdata->local;
898         int allmulti, promisc, sdata_allmulti, sdata_promisc;
899
900         allmulti = !!(dev->flags & IFF_ALLMULTI);
901         promisc = !!(dev->flags & IFF_PROMISC);
902         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
903         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
904
905         if (allmulti != sdata_allmulti) {
906                 if (dev->flags & IFF_ALLMULTI)
907                         atomic_inc(&local->iff_allmultis);
908                 else
909                         atomic_dec(&local->iff_allmultis);
910                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
911         }
912
913         if (promisc != sdata_promisc) {
914                 if (dev->flags & IFF_PROMISC)
915                         atomic_inc(&local->iff_promiscs);
916                 else
917                         atomic_dec(&local->iff_promiscs);
918                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
919         }
920         spin_lock_bh(&local->filter_lock);
921         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
922         spin_unlock_bh(&local->filter_lock);
923         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
924 }
925
926 /*
927  * Called when the netdev is removed or, by the code below, before
928  * the interface type changes.
929  */
930 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
931 {
932         int flushed;
933         int i;
934
935         /* free extra data */
936         ieee80211_free_keys(sdata);
937
938         ieee80211_debugfs_remove_netdev(sdata);
939
940         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
941                 __skb_queue_purge(&sdata->fragments[i].skb_list);
942         sdata->fragment_next = 0;
943
944         if (ieee80211_vif_is_mesh(&sdata->vif))
945                 mesh_rmc_free(sdata);
946
947         flushed = sta_info_flush(sdata);
948         WARN_ON(flushed);
949 }
950
951 static void ieee80211_uninit(struct net_device *dev)
952 {
953         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
954 }
955
956 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
957                                          struct sk_buff *skb)
958 {
959         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
960 }
961
962 static const struct net_device_ops ieee80211_dataif_ops = {
963         .ndo_open               = ieee80211_open,
964         .ndo_stop               = ieee80211_stop,
965         .ndo_uninit             = ieee80211_uninit,
966         .ndo_start_xmit         = ieee80211_subif_start_xmit,
967         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
968         .ndo_change_mtu         = ieee80211_change_mtu,
969         .ndo_set_mac_address    = ieee80211_change_mac,
970         .ndo_select_queue       = ieee80211_netdev_select_queue,
971 };
972
973 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
974                                           struct sk_buff *skb)
975 {
976         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
977         struct ieee80211_local *local = sdata->local;
978         struct ieee80211_hdr *hdr;
979         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
980
981         if (local->hw.queues < IEEE80211_NUM_ACS)
982                 return 0;
983
984         if (skb->len < 4 ||
985             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
986                 return 0; /* doesn't matter, frame will be dropped */
987
988         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
989
990         return ieee80211_select_queue_80211(sdata, skb, hdr);
991 }
992
993 static const struct net_device_ops ieee80211_monitorif_ops = {
994         .ndo_open               = ieee80211_open,
995         .ndo_stop               = ieee80211_stop,
996         .ndo_uninit             = ieee80211_uninit,
997         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
998         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
999         .ndo_change_mtu         = ieee80211_change_mtu,
1000         .ndo_set_mac_address    = eth_mac_addr,
1001         .ndo_select_queue       = ieee80211_monitor_select_queue,
1002 };
1003
1004 static void ieee80211_if_setup(struct net_device *dev)
1005 {
1006         ether_setup(dev);
1007         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1008         dev->netdev_ops = &ieee80211_dataif_ops;
1009         dev->destructor = free_netdev;
1010 }
1011
1012 static void ieee80211_iface_work(struct work_struct *work)
1013 {
1014         struct ieee80211_sub_if_data *sdata =
1015                 container_of(work, struct ieee80211_sub_if_data, work);
1016         struct ieee80211_local *local = sdata->local;
1017         struct sk_buff *skb;
1018         struct sta_info *sta;
1019         struct ieee80211_ra_tid *ra_tid;
1020
1021         if (!ieee80211_sdata_running(sdata))
1022                 return;
1023
1024         if (local->scanning)
1025                 return;
1026
1027         /*
1028          * ieee80211_queue_work() should have picked up most cases,
1029          * here we'll pick the rest.
1030          */
1031         if (WARN(local->suspended,
1032                  "interface work scheduled while going to suspend\n"))
1033                 return;
1034
1035         /* first process frames */
1036         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1037                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1038
1039                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1040                         ra_tid = (void *)&skb->cb;
1041                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1042                                                  ra_tid->tid);
1043                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1044                         ra_tid = (void *)&skb->cb;
1045                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1046                                                 ra_tid->tid);
1047                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1048                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1049                         int len = skb->len;
1050
1051                         mutex_lock(&local->sta_mtx);
1052                         sta = sta_info_get_bss(sdata, mgmt->sa);
1053                         if (sta) {
1054                                 switch (mgmt->u.action.u.addba_req.action_code) {
1055                                 case WLAN_ACTION_ADDBA_REQ:
1056                                         ieee80211_process_addba_request(
1057                                                         local, sta, mgmt, len);
1058                                         break;
1059                                 case WLAN_ACTION_ADDBA_RESP:
1060                                         ieee80211_process_addba_resp(local, sta,
1061                                                                      mgmt, len);
1062                                         break;
1063                                 case WLAN_ACTION_DELBA:
1064                                         ieee80211_process_delba(sdata, sta,
1065                                                                 mgmt, len);
1066                                         break;
1067                                 default:
1068                                         WARN_ON(1);
1069                                         break;
1070                                 }
1071                         }
1072                         mutex_unlock(&local->sta_mtx);
1073                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1074                         struct ieee80211_hdr *hdr = (void *)mgmt;
1075                         /*
1076                          * So the frame isn't mgmt, but frame_control
1077                          * is at the right place anyway, of course, so
1078                          * the if statement is correct.
1079                          *
1080                          * Warn if we have other data frame types here,
1081                          * they must not get here.
1082                          */
1083                         WARN_ON(hdr->frame_control &
1084                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1085                         WARN_ON(!(hdr->seq_ctrl &
1086                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1087                         /*
1088                          * This was a fragment of a frame, received while
1089                          * a block-ack session was active. That cannot be
1090                          * right, so terminate the session.
1091                          */
1092                         mutex_lock(&local->sta_mtx);
1093                         sta = sta_info_get_bss(sdata, mgmt->sa);
1094                         if (sta) {
1095                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1096                                                 IEEE80211_QOS_CTL_TID_MASK;
1097
1098                                 __ieee80211_stop_rx_ba_session(
1099                                         sta, tid, WLAN_BACK_RECIPIENT,
1100                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1101                                         true);
1102                         }
1103                         mutex_unlock(&local->sta_mtx);
1104                 } else switch (sdata->vif.type) {
1105                 case NL80211_IFTYPE_STATION:
1106                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1107                         break;
1108                 case NL80211_IFTYPE_ADHOC:
1109                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1110                         break;
1111                 case NL80211_IFTYPE_MESH_POINT:
1112                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1113                                 break;
1114                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1115                         break;
1116                 default:
1117                         WARN(1, "frame for unexpected interface type");
1118                         break;
1119                 }
1120
1121                 kfree_skb(skb);
1122         }
1123
1124         /* then other type-dependent work */
1125         switch (sdata->vif.type) {
1126         case NL80211_IFTYPE_STATION:
1127                 ieee80211_sta_work(sdata);
1128                 break;
1129         case NL80211_IFTYPE_ADHOC:
1130                 ieee80211_ibss_work(sdata);
1131                 break;
1132         case NL80211_IFTYPE_MESH_POINT:
1133                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1134                         break;
1135                 ieee80211_mesh_work(sdata);
1136                 break;
1137         default:
1138                 break;
1139         }
1140 }
1141
1142 static void ieee80211_recalc_smps_work(struct work_struct *work)
1143 {
1144         struct ieee80211_sub_if_data *sdata =
1145                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1146
1147         ieee80211_recalc_smps(sdata);
1148 }
1149
1150 /*
1151  * Helper function to initialise an interface to a specific type.
1152  */
1153 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1154                                   enum nl80211_iftype type)
1155 {
1156         /* clear type-dependent union */
1157         memset(&sdata->u, 0, sizeof(sdata->u));
1158
1159         /* and set some type-dependent values */
1160         sdata->vif.type = type;
1161         sdata->vif.p2p = false;
1162         sdata->wdev.iftype = type;
1163
1164         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1165         sdata->control_port_no_encrypt = false;
1166
1167         sdata->noack_map = 0;
1168
1169         /* only monitor/p2p-device differ */
1170         if (sdata->dev) {
1171                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1172                 sdata->dev->type = ARPHRD_ETHER;
1173         }
1174
1175         skb_queue_head_init(&sdata->skb_queue);
1176         INIT_WORK(&sdata->work, ieee80211_iface_work);
1177         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1178
1179         switch (type) {
1180         case NL80211_IFTYPE_P2P_GO:
1181                 type = NL80211_IFTYPE_AP;
1182                 sdata->vif.type = type;
1183                 sdata->vif.p2p = true;
1184                 /* fall through */
1185         case NL80211_IFTYPE_AP:
1186                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1187                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1188                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1189                 break;
1190         case NL80211_IFTYPE_P2P_CLIENT:
1191                 type = NL80211_IFTYPE_STATION;
1192                 sdata->vif.type = type;
1193                 sdata->vif.p2p = true;
1194                 /* fall through */
1195         case NL80211_IFTYPE_STATION:
1196                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1197                 ieee80211_sta_setup_sdata(sdata);
1198                 break;
1199         case NL80211_IFTYPE_ADHOC:
1200                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1201                 ieee80211_ibss_setup_sdata(sdata);
1202                 break;
1203         case NL80211_IFTYPE_MESH_POINT:
1204                 if (ieee80211_vif_is_mesh(&sdata->vif))
1205                         ieee80211_mesh_init_sdata(sdata);
1206                 break;
1207         case NL80211_IFTYPE_MONITOR:
1208                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1209                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1210                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1211                                       MONITOR_FLAG_OTHER_BSS;
1212                 break;
1213         case NL80211_IFTYPE_WDS:
1214                 sdata->vif.bss_conf.bssid = NULL;
1215                 break;
1216         case NL80211_IFTYPE_AP_VLAN:
1217                 break;
1218         case NL80211_IFTYPE_P2P_DEVICE:
1219                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1220                 break;
1221         case NL80211_IFTYPE_UNSPECIFIED:
1222         case NUM_NL80211_IFTYPES:
1223                 BUG();
1224                 break;
1225         }
1226
1227         ieee80211_debugfs_add_netdev(sdata);
1228 }
1229
1230 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1231                                            enum nl80211_iftype type)
1232 {
1233         struct ieee80211_local *local = sdata->local;
1234         int ret, err;
1235         enum nl80211_iftype internal_type = type;
1236         bool p2p = false;
1237
1238         ASSERT_RTNL();
1239
1240         if (!local->ops->change_interface)
1241                 return -EBUSY;
1242
1243         switch (sdata->vif.type) {
1244         case NL80211_IFTYPE_AP:
1245         case NL80211_IFTYPE_STATION:
1246         case NL80211_IFTYPE_ADHOC:
1247                 /*
1248                  * Could maybe also all others here?
1249                  * Just not sure how that interacts
1250                  * with the RX/config path e.g. for
1251                  * mesh.
1252                  */
1253                 break;
1254         default:
1255                 return -EBUSY;
1256         }
1257
1258         switch (type) {
1259         case NL80211_IFTYPE_AP:
1260         case NL80211_IFTYPE_STATION:
1261         case NL80211_IFTYPE_ADHOC:
1262                 /*
1263                  * Could probably support everything
1264                  * but WDS here (WDS do_open can fail
1265                  * under memory pressure, which this
1266                  * code isn't prepared to handle).
1267                  */
1268                 break;
1269         case NL80211_IFTYPE_P2P_CLIENT:
1270                 p2p = true;
1271                 internal_type = NL80211_IFTYPE_STATION;
1272                 break;
1273         case NL80211_IFTYPE_P2P_GO:
1274                 p2p = true;
1275                 internal_type = NL80211_IFTYPE_AP;
1276                 break;
1277         default:
1278                 return -EBUSY;
1279         }
1280
1281         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1282         if (ret)
1283                 return ret;
1284
1285         ieee80211_do_stop(sdata, false);
1286
1287         ieee80211_teardown_sdata(sdata);
1288
1289         ret = drv_change_interface(local, sdata, internal_type, p2p);
1290         if (ret)
1291                 type = sdata->vif.type;
1292
1293         /*
1294          * Ignore return value here, there's not much we can do since
1295          * the driver changed the interface type internally already.
1296          * The warnings will hopefully make driver authors fix it :-)
1297          */
1298         ieee80211_check_queues(sdata);
1299
1300         ieee80211_setup_sdata(sdata, type);
1301
1302         err = ieee80211_do_open(&sdata->wdev, false);
1303         WARN(err, "type change: do_open returned %d", err);
1304
1305         return ret;
1306 }
1307
1308 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1309                              enum nl80211_iftype type)
1310 {
1311         int ret;
1312
1313         ASSERT_RTNL();
1314
1315         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1316                 return 0;
1317
1318         if (ieee80211_sdata_running(sdata)) {
1319                 ret = ieee80211_runtime_change_iftype(sdata, type);
1320                 if (ret)
1321                         return ret;
1322         } else {
1323                 /* Purge and reset type-dependent state. */
1324                 ieee80211_teardown_sdata(sdata);
1325                 ieee80211_setup_sdata(sdata, type);
1326         }
1327
1328         /* reset some values that shouldn't be kept across type changes */
1329         sdata->drop_unencrypted = 0;
1330         if (type == NL80211_IFTYPE_STATION)
1331                 sdata->u.mgd.use_4addr = false;
1332
1333         return 0;
1334 }
1335
1336 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1337                                        u8 *perm_addr, enum nl80211_iftype type)
1338 {
1339         struct ieee80211_sub_if_data *sdata;
1340         u64 mask, start, addr, val, inc;
1341         u8 *m;
1342         u8 tmp_addr[ETH_ALEN];
1343         int i;
1344
1345         /* default ... something at least */
1346         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1347
1348         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1349             local->hw.wiphy->n_addresses <= 1)
1350                 return;
1351
1352         mutex_lock(&local->iflist_mtx);
1353
1354         switch (type) {
1355         case NL80211_IFTYPE_MONITOR:
1356                 /* doesn't matter */
1357                 break;
1358         case NL80211_IFTYPE_WDS:
1359         case NL80211_IFTYPE_AP_VLAN:
1360                 /* match up with an AP interface */
1361                 list_for_each_entry(sdata, &local->interfaces, list) {
1362                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1363                                 continue;
1364                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1365                         break;
1366                 }
1367                 /* keep default if no AP interface present */
1368                 break;
1369         case NL80211_IFTYPE_P2P_CLIENT:
1370         case NL80211_IFTYPE_P2P_GO:
1371                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1372                         list_for_each_entry(sdata, &local->interfaces, list) {
1373                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1374                                         continue;
1375                                 if (!ieee80211_sdata_running(sdata))
1376                                         continue;
1377                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1378                                 goto out_unlock;
1379                         }
1380                 }
1381                 /* otherwise fall through */
1382         default:
1383                 /* assign a new address if possible -- try n_addresses first */
1384                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1385                         bool used = false;
1386
1387                         list_for_each_entry(sdata, &local->interfaces, list) {
1388                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1389                                            sdata->vif.addr, ETH_ALEN) == 0) {
1390                                         used = true;
1391                                         break;
1392                                 }
1393                         }
1394
1395                         if (!used) {
1396                                 memcpy(perm_addr,
1397                                        local->hw.wiphy->addresses[i].addr,
1398                                        ETH_ALEN);
1399                                 break;
1400                         }
1401                 }
1402
1403                 /* try mask if available */
1404                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1405                         break;
1406
1407                 m = local->hw.wiphy->addr_mask;
1408                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1409                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1410                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1411
1412                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1413                         /* not a contiguous mask ... not handled now! */
1414                         pr_info("not contiguous\n");
1415                         break;
1416                 }
1417
1418                 m = local->hw.wiphy->perm_addr;
1419                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1420                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1421                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1422
1423                 inc = 1ULL<<__ffs64(mask);
1424                 val = (start & mask);
1425                 addr = (start & ~mask) | (val & mask);
1426                 do {
1427                         bool used = false;
1428
1429                         tmp_addr[5] = addr >> 0*8;
1430                         tmp_addr[4] = addr >> 1*8;
1431                         tmp_addr[3] = addr >> 2*8;
1432                         tmp_addr[2] = addr >> 3*8;
1433                         tmp_addr[1] = addr >> 4*8;
1434                         tmp_addr[0] = addr >> 5*8;
1435
1436                         val += inc;
1437
1438                         list_for_each_entry(sdata, &local->interfaces, list) {
1439                                 if (memcmp(tmp_addr, sdata->vif.addr,
1440                                                         ETH_ALEN) == 0) {
1441                                         used = true;
1442                                         break;
1443                                 }
1444                         }
1445
1446                         if (!used) {
1447                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1448                                 break;
1449                         }
1450                         addr = (start & ~mask) | (val & mask);
1451                 } while (addr != start);
1452
1453                 break;
1454         }
1455
1456  out_unlock:
1457         mutex_unlock(&local->iflist_mtx);
1458 }
1459
1460 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1461 {
1462         struct ieee80211_sub_if_data *sdata;
1463
1464         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1465
1466         ieee80211_cleanup_sdata_stas(sdata);
1467 }
1468
1469 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1470                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1471                      struct vif_params *params)
1472 {
1473         struct net_device *ndev = NULL;
1474         struct ieee80211_sub_if_data *sdata = NULL;
1475         int ret, i;
1476         int txqs = 1;
1477
1478         ASSERT_RTNL();
1479
1480         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1481                 struct wireless_dev *wdev;
1482
1483                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1484                                 GFP_KERNEL);
1485                 if (!sdata)
1486                         return -ENOMEM;
1487                 wdev = &sdata->wdev;
1488
1489                 sdata->dev = NULL;
1490                 strlcpy(sdata->name, name, IFNAMSIZ);
1491                 ieee80211_assign_perm_addr(local, wdev->address, type);
1492                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1493         } else {
1494                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1495                         txqs = IEEE80211_NUM_ACS;
1496
1497                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1498                                         local->hw.vif_data_size,
1499                                         name, ieee80211_if_setup, txqs, 1);
1500                 if (!ndev)
1501                         return -ENOMEM;
1502                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1503
1504                 ndev->needed_headroom = local->tx_headroom +
1505                                         4*6 /* four MAC addresses */
1506                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1507                                         + 6 /* mesh */
1508                                         + 8 /* rfc1042/bridge tunnel */
1509                                         - ETH_HLEN /* ethernet hard_header_len */
1510                                         + IEEE80211_ENCRYPT_HEADROOM;
1511                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1512
1513                 ret = dev_alloc_name(ndev, ndev->name);
1514                 if (ret < 0) {
1515                         free_netdev(ndev);
1516                         return ret;
1517                 }
1518
1519                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1520                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1521                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1522
1523                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1524                 sdata = netdev_priv(ndev);
1525                 ndev->ieee80211_ptr = &sdata->wdev;
1526                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1527                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1528
1529                 sdata->dev = ndev;
1530         }
1531
1532         /* initialise type-independent data */
1533         sdata->wdev.wiphy = local->hw.wiphy;
1534         sdata->local = local;
1535
1536         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1537                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1538
1539         INIT_LIST_HEAD(&sdata->key_list);
1540
1541         spin_lock_init(&sdata->cleanup_stations_lock);
1542         INIT_LIST_HEAD(&sdata->cleanup_stations);
1543         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1544         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1545                           ieee80211_dfs_cac_timer_work);
1546         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1547                           ieee80211_delayed_tailroom_dec);
1548
1549         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1550                 struct ieee80211_supported_band *sband;
1551                 sband = local->hw.wiphy->bands[i];
1552                 sdata->rc_rateidx_mask[i] =
1553                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1554                 if (sband)
1555                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1556                                sband->ht_cap.mcs.rx_mask,
1557                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1558                 else
1559                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1560                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1561         }
1562
1563         ieee80211_set_default_queues(sdata);
1564
1565         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1566         sdata->user_power_level = local->user_power_level;
1567
1568         /* setup type-dependent data */
1569         ieee80211_setup_sdata(sdata, type);
1570
1571         if (ndev) {
1572                 if (params) {
1573                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1574                         if (type == NL80211_IFTYPE_STATION)
1575                                 sdata->u.mgd.use_4addr = params->use_4addr;
1576                 }
1577
1578                 ndev->features |= local->hw.netdev_features;
1579
1580                 ret = register_netdevice(ndev);
1581                 if (ret) {
1582                         free_netdev(ndev);
1583                         return ret;
1584                 }
1585         }
1586
1587         mutex_lock(&local->iflist_mtx);
1588         list_add_tail_rcu(&sdata->list, &local->interfaces);
1589         mutex_unlock(&local->iflist_mtx);
1590
1591         if (new_wdev)
1592                 *new_wdev = &sdata->wdev;
1593
1594         return 0;
1595 }
1596
1597 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1598 {
1599         ASSERT_RTNL();
1600
1601         mutex_lock(&sdata->local->iflist_mtx);
1602         list_del_rcu(&sdata->list);
1603         mutex_unlock(&sdata->local->iflist_mtx);
1604
1605         synchronize_rcu();
1606
1607         if (sdata->dev) {
1608                 unregister_netdevice(sdata->dev);
1609         } else {
1610                 cfg80211_unregister_wdev(&sdata->wdev);
1611                 kfree(sdata);
1612         }
1613 }
1614
1615 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1616 {
1617         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1618                 return;
1619         ieee80211_do_stop(sdata, true);
1620         ieee80211_teardown_sdata(sdata);
1621 }
1622
1623 /*
1624  * Remove all interfaces, may only be called at hardware unregistration
1625  * time because it doesn't do RCU-safe list removals.
1626  */
1627 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1628 {
1629         struct ieee80211_sub_if_data *sdata, *tmp;
1630         LIST_HEAD(unreg_list);
1631         LIST_HEAD(wdev_list);
1632
1633         ASSERT_RTNL();
1634
1635         mutex_lock(&local->iflist_mtx);
1636         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1637                 list_del(&sdata->list);
1638
1639                 if (sdata->dev)
1640                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1641                 else
1642                         list_add(&sdata->list, &wdev_list);
1643         }
1644         mutex_unlock(&local->iflist_mtx);
1645         unregister_netdevice_many(&unreg_list);
1646         list_del(&unreg_list);
1647
1648         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1649                 list_del(&sdata->list);
1650                 cfg80211_unregister_wdev(&sdata->wdev);
1651                 kfree(sdata);
1652         }
1653 }
1654
1655 static int netdev_notify(struct notifier_block *nb,
1656                          unsigned long state,
1657                          void *ndev)
1658 {
1659         struct net_device *dev = ndev;
1660         struct ieee80211_sub_if_data *sdata;
1661
1662         if (state != NETDEV_CHANGENAME)
1663                 return 0;
1664
1665         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1666                 return 0;
1667
1668         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1669                 return 0;
1670
1671         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1672
1673         memcpy(sdata->name, dev->name, IFNAMSIZ);
1674
1675         ieee80211_debugfs_rename_netdev(sdata);
1676         return 0;
1677 }
1678
1679 static struct notifier_block mac80211_netdev_notifier = {
1680         .notifier_call = netdev_notify,
1681 };
1682
1683 int ieee80211_iface_init(void)
1684 {
1685         return register_netdevice_notifier(&mac80211_netdev_notifier);
1686 }
1687
1688 void ieee80211_iface_exit(void)
1689 {
1690         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1691 }