Merge remote-tracking branch 'wireless-next/master' into mac80211-next
[linux-3.10.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling (except master interface)
3  *
4  * Copyright 2002-2005, Instant802 Networks, Inc.
5  * Copyright 2005-2006, Devicescape Software, Inc.
6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30  * DOC: Interface list locking
31  *
32  * The interface list in each struct ieee80211_local is protected
33  * three-fold:
34  *
35  * (1) modifications may only be done under the RTNL
36  * (2) modifications and readers are protected against each other by
37  *     the iflist_mtx.
38  * (3) modifications are done in an RCU manner so atomic readers
39  *     can traverse the list in RCU-safe blocks.
40  *
41  * As a consequence, reads (traversals) of the list can be protected
42  * by either the RTNL, the iflist_mtx or RCU.
43  */
44
45
46 static u32 ieee80211_idle_off(struct ieee80211_local *local,
47                               const char *reason)
48 {
49         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
50                 return 0;
51
52         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
53         return IEEE80211_CONF_CHANGE_IDLE;
54 }
55
56 static u32 ieee80211_idle_on(struct ieee80211_local *local)
57 {
58         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
59                 return 0;
60
61         drv_flush(local, false);
62
63         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
64         return IEEE80211_CONF_CHANGE_IDLE;
65 }
66
67 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
68 {
69         struct ieee80211_sub_if_data *sdata;
70         int count = 0;
71         bool working = false, scanning = false;
72         unsigned int led_trig_start = 0, led_trig_stop = 0;
73         struct ieee80211_roc_work *roc;
74
75 #ifdef CONFIG_PROVE_LOCKING
76         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
77                 !lockdep_is_held(&local->iflist_mtx));
78 #endif
79         lockdep_assert_held(&local->mtx);
80
81         list_for_each_entry(sdata, &local->interfaces, list) {
82                 if (!ieee80211_sdata_running(sdata)) {
83                         sdata->vif.bss_conf.idle = true;
84                         continue;
85                 }
86
87                 sdata->old_idle = sdata->vif.bss_conf.idle;
88
89                 /* do not count disabled managed interfaces */
90                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
91                     !sdata->u.mgd.associated &&
92                     !sdata->u.mgd.auth_data &&
93                     !sdata->u.mgd.assoc_data) {
94                         sdata->vif.bss_conf.idle = true;
95                         continue;
96                 }
97                 /* do not count unused IBSS interfaces */
98                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
99                     !sdata->u.ibss.ssid_len) {
100                         sdata->vif.bss_conf.idle = true;
101                         continue;
102                 }
103
104                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
105                         continue;
106
107                 /* count everything else */
108                 sdata->vif.bss_conf.idle = false;
109                 count++;
110         }
111
112         if (!local->ops->remain_on_channel) {
113                 list_for_each_entry(roc, &local->roc_list, list) {
114                         working = true;
115                         roc->sdata->vif.bss_conf.idle = false;
116                 }
117         }
118
119         sdata = rcu_dereference_protected(local->scan_sdata,
120                                           lockdep_is_held(&local->mtx));
121         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
122                 scanning = true;
123                 sdata->vif.bss_conf.idle = false;
124         }
125
126         list_for_each_entry(sdata, &local->interfaces, list) {
127                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
128                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
129                     sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
130                         continue;
131                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
132                         continue;
133                 if (!ieee80211_sdata_running(sdata))
134                         continue;
135                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
136         }
137
138         if (working || scanning)
139                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
140         else
141                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
142
143         if (count)
144                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
145         else
146                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
147
148         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
149
150         if (working)
151                 return ieee80211_idle_off(local, "working");
152         if (scanning)
153                 return ieee80211_idle_off(local, "scanning");
154         if (!count)
155                 return ieee80211_idle_on(local);
156         else
157                 return ieee80211_idle_off(local, "in use");
158
159         return 0;
160 }
161
162 void ieee80211_recalc_idle(struct ieee80211_local *local)
163 {
164         u32 chg;
165
166         mutex_lock(&local->iflist_mtx);
167         chg = __ieee80211_recalc_idle(local);
168         mutex_unlock(&local->iflist_mtx);
169         if (chg)
170                 ieee80211_hw_config(local, chg);
171 }
172
173 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
174 {
175         int meshhdrlen;
176         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
177
178         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
179
180         /* FIX: what would be proper limits for MTU?
181          * This interface uses 802.3 frames. */
182         if (new_mtu < 256 ||
183             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
184                 return -EINVAL;
185         }
186
187         dev->mtu = new_mtu;
188         return 0;
189 }
190
191 static int ieee80211_change_mac(struct net_device *dev, void *addr)
192 {
193         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
194         struct sockaddr *sa = addr;
195         int ret;
196
197         if (ieee80211_sdata_running(sdata))
198                 return -EBUSY;
199
200         ret = eth_mac_addr(dev, sa);
201
202         if (ret == 0)
203                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
204
205         return ret;
206 }
207
208 static inline int identical_mac_addr_allowed(int type1, int type2)
209 {
210         return type1 == NL80211_IFTYPE_MONITOR ||
211                 type2 == NL80211_IFTYPE_MONITOR ||
212                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
213                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
214                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
215                 (type1 == NL80211_IFTYPE_WDS &&
216                         (type2 == NL80211_IFTYPE_WDS ||
217                          type2 == NL80211_IFTYPE_AP)) ||
218                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
219                 (type1 == NL80211_IFTYPE_AP_VLAN &&
220                         (type2 == NL80211_IFTYPE_AP ||
221                          type2 == NL80211_IFTYPE_AP_VLAN));
222 }
223
224 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
225                                             enum nl80211_iftype iftype)
226 {
227         struct ieee80211_local *local = sdata->local;
228         struct ieee80211_sub_if_data *nsdata;
229
230         ASSERT_RTNL();
231
232         /* we hold the RTNL here so can safely walk the list */
233         list_for_each_entry(nsdata, &local->interfaces, list) {
234                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
235                         /*
236                          * Allow only a single IBSS interface to be up at any
237                          * time. This is restricted because beacon distribution
238                          * cannot work properly if both are in the same IBSS.
239                          *
240                          * To remove this restriction we'd have to disallow them
241                          * from setting the same SSID on different IBSS interfaces
242                          * belonging to the same hardware. Then, however, we're
243                          * faced with having to adopt two different TSF timers...
244                          */
245                         if (iftype == NL80211_IFTYPE_ADHOC &&
246                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
247                                 return -EBUSY;
248
249                         /*
250                          * The remaining checks are only performed for interfaces
251                          * with the same MAC address.
252                          */
253                         if (!ether_addr_equal(sdata->vif.addr,
254                                               nsdata->vif.addr))
255                                 continue;
256
257                         /*
258                          * check whether it may have the same address
259                          */
260                         if (!identical_mac_addr_allowed(iftype,
261                                                         nsdata->vif.type))
262                                 return -ENOTUNIQ;
263
264                         /*
265                          * can only add VLANs to enabled APs
266                          */
267                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
268                             nsdata->vif.type == NL80211_IFTYPE_AP)
269                                 sdata->bss = &nsdata->u.ap;
270                 }
271         }
272
273         return 0;
274 }
275
276 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
277 {
278         int n_queues = sdata->local->hw.queues;
279         int i;
280
281         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
282                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
283                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
284                                          IEEE80211_INVAL_HW_QUEUE))
285                                 return -EINVAL;
286                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
287                                          n_queues))
288                                 return -EINVAL;
289                 }
290         }
291
292         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
293             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
294                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
295                 return 0;
296         }
297
298         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
299                 return -EINVAL;
300
301         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
302                 return -EINVAL;
303
304         return 0;
305 }
306
307 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
308                                     const int offset)
309 {
310         struct ieee80211_local *local = sdata->local;
311         u32 flags = sdata->u.mntr_flags;
312
313 #define ADJUST(_f, _s)  do {                                    \
314         if (flags & MONITOR_FLAG_##_f)                          \
315                 local->fif_##_s += offset;                      \
316         } while (0)
317
318         ADJUST(FCSFAIL, fcsfail);
319         ADJUST(PLCPFAIL, plcpfail);
320         ADJUST(CONTROL, control);
321         ADJUST(CONTROL, pspoll);
322         ADJUST(OTHER_BSS, other_bss);
323
324 #undef ADJUST
325 }
326
327 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
328 {
329         struct ieee80211_local *local = sdata->local;
330         int i;
331
332         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
333                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
334                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
335                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
336                         sdata->vif.hw_queue[i] = i;
337                 else
338                         sdata->vif.hw_queue[i] = 0;
339         }
340         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
341 }
342
343 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
344 {
345         struct ieee80211_sub_if_data *sdata;
346         int ret = 0;
347
348         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
349                 return 0;
350
351         mutex_lock(&local->iflist_mtx);
352
353         if (local->monitor_sdata)
354                 goto out_unlock;
355
356         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
357         if (!sdata) {
358                 ret = -ENOMEM;
359                 goto out_unlock;
360         }
361
362         /* set up data */
363         sdata->local = local;
364         sdata->vif.type = NL80211_IFTYPE_MONITOR;
365         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
366                  wiphy_name(local->hw.wiphy));
367
368         ieee80211_set_default_queues(sdata);
369
370         ret = drv_add_interface(local, sdata);
371         if (WARN_ON(ret)) {
372                 /* ok .. stupid driver, it asked for this! */
373                 kfree(sdata);
374                 goto out_unlock;
375         }
376
377         ret = ieee80211_check_queues(sdata);
378         if (ret) {
379                 kfree(sdata);
380                 goto out_unlock;
381         }
382
383         ret = ieee80211_vif_use_channel(sdata, local->monitor_channel,
384                                         local->monitor_channel_type,
385                                         IEEE80211_CHANCTX_EXCLUSIVE);
386         if (ret) {
387                 drv_remove_interface(local, sdata);
388                 kfree(sdata);
389                 goto out_unlock;
390         }
391
392         rcu_assign_pointer(local->monitor_sdata, sdata);
393  out_unlock:
394         mutex_unlock(&local->iflist_mtx);
395         return ret;
396 }
397
398 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
399 {
400         struct ieee80211_sub_if_data *sdata;
401
402         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
403                 return;
404
405         mutex_lock(&local->iflist_mtx);
406
407         sdata = rcu_dereference_protected(local->monitor_sdata,
408                                           lockdep_is_held(&local->iflist_mtx));
409         if (!sdata)
410                 goto out_unlock;
411
412         rcu_assign_pointer(local->monitor_sdata, NULL);
413         synchronize_net();
414
415         ieee80211_vif_release_channel(sdata);
416
417         drv_remove_interface(local, sdata);
418
419         kfree(sdata);
420  out_unlock:
421         mutex_unlock(&local->iflist_mtx);
422 }
423
424 /*
425  * NOTE: Be very careful when changing this function, it must NOT return
426  * an error on interface type changes that have been pre-checked, so most
427  * checks should be in ieee80211_check_concurrent_iface.
428  */
429 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
430 {
431         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
432         struct net_device *dev = wdev->netdev;
433         struct ieee80211_local *local = sdata->local;
434         struct sta_info *sta;
435         u32 changed = 0;
436         int res;
437         u32 hw_reconf_flags = 0;
438
439         switch (sdata->vif.type) {
440         case NL80211_IFTYPE_WDS:
441                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
442                         return -ENOLINK;
443                 break;
444         case NL80211_IFTYPE_AP_VLAN: {
445                 struct ieee80211_sub_if_data *master;
446
447                 if (!sdata->bss)
448                         return -ENOLINK;
449
450                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
451
452                 master = container_of(sdata->bss,
453                                       struct ieee80211_sub_if_data, u.ap);
454                 sdata->control_port_protocol =
455                         master->control_port_protocol;
456                 sdata->control_port_no_encrypt =
457                         master->control_port_no_encrypt;
458                 break;
459                 }
460         case NL80211_IFTYPE_AP:
461                 sdata->bss = &sdata->u.ap;
462                 break;
463         case NL80211_IFTYPE_MESH_POINT:
464         case NL80211_IFTYPE_STATION:
465         case NL80211_IFTYPE_MONITOR:
466         case NL80211_IFTYPE_ADHOC:
467         case NL80211_IFTYPE_P2P_DEVICE:
468                 /* no special treatment */
469                 break;
470         case NL80211_IFTYPE_UNSPECIFIED:
471         case NUM_NL80211_IFTYPES:
472         case NL80211_IFTYPE_P2P_CLIENT:
473         case NL80211_IFTYPE_P2P_GO:
474                 /* cannot happen */
475                 WARN_ON(1);
476                 break;
477         }
478
479         if (local->open_count == 0) {
480                 res = drv_start(local);
481                 if (res)
482                         goto err_del_bss;
483                 if (local->ops->napi_poll)
484                         napi_enable(&local->napi);
485                 /* we're brought up, everything changes */
486                 hw_reconf_flags = ~0;
487                 ieee80211_led_radio(local, true);
488                 ieee80211_mod_tpt_led_trig(local,
489                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
490         }
491
492         /*
493          * Copy the hopefully now-present MAC address to
494          * this interface, if it has the special null one.
495          */
496         if (dev && is_zero_ether_addr(dev->dev_addr)) {
497                 memcpy(dev->dev_addr,
498                        local->hw.wiphy->perm_addr,
499                        ETH_ALEN);
500                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
501
502                 if (!is_valid_ether_addr(dev->dev_addr)) {
503                         res = -EADDRNOTAVAIL;
504                         goto err_stop;
505                 }
506         }
507
508         switch (sdata->vif.type) {
509         case NL80211_IFTYPE_AP_VLAN:
510                 /* no need to tell driver, but set carrier */
511                 if (rtnl_dereference(sdata->bss->beacon))
512                         netif_carrier_on(dev);
513                 else
514                         netif_carrier_off(dev);
515                 break;
516         case NL80211_IFTYPE_MONITOR:
517                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
518                         local->cooked_mntrs++;
519                         break;
520                 }
521
522                 if (local->monitors == 0 && local->open_count == 0) {
523                         res = ieee80211_add_virtual_monitor(local);
524                         if (res)
525                                 goto err_stop;
526                 }
527
528                 /* must be before the call to ieee80211_configure_filter */
529                 local->monitors++;
530                 if (local->monitors == 1) {
531                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
532                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
533                 }
534
535                 ieee80211_adjust_monitor_flags(sdata, 1);
536                 ieee80211_configure_filter(local);
537
538                 netif_carrier_on(dev);
539                 break;
540         default:
541                 if (coming_up) {
542                         ieee80211_del_virtual_monitor(local);
543
544                         res = drv_add_interface(local, sdata);
545                         if (res)
546                                 goto err_stop;
547                         res = ieee80211_check_queues(sdata);
548                         if (res)
549                                 goto err_del_interface;
550                 }
551
552                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
553                         local->fif_pspoll++;
554                         local->fif_probe_req++;
555
556                         ieee80211_configure_filter(local);
557                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
558                         local->fif_probe_req++;
559                 }
560
561                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
562                         changed |= ieee80211_reset_erp_info(sdata);
563                 ieee80211_bss_info_change_notify(sdata, changed);
564
565                 switch (sdata->vif.type) {
566                 case NL80211_IFTYPE_STATION:
567                 case NL80211_IFTYPE_ADHOC:
568                 case NL80211_IFTYPE_AP:
569                 case NL80211_IFTYPE_MESH_POINT:
570                         netif_carrier_off(dev);
571                         break;
572                 case NL80211_IFTYPE_WDS:
573                 case NL80211_IFTYPE_P2P_DEVICE:
574                         break;
575                 default:
576                         netif_carrier_on(dev);
577                 }
578
579                 /*
580                  * set default queue parameters so drivers don't
581                  * need to initialise the hardware if the hardware
582                  * doesn't start up with sane defaults
583                  */
584                 ieee80211_set_wmm_default(sdata, true);
585         }
586
587         set_bit(SDATA_STATE_RUNNING, &sdata->state);
588
589         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
590                 /* Create STA entry for the WDS peer */
591                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
592                                      GFP_KERNEL);
593                 if (!sta) {
594                         res = -ENOMEM;
595                         goto err_del_interface;
596                 }
597
598                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
599                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
600                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
601
602                 res = sta_info_insert(sta);
603                 if (res) {
604                         /* STA has been freed */
605                         goto err_del_interface;
606                 }
607
608                 rate_control_rate_init(sta);
609                 netif_carrier_on(dev);
610         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
611                 rcu_assign_pointer(local->p2p_sdata, sdata);
612         }
613
614         /*
615          * set_multicast_list will be invoked by the networking core
616          * which will check whether any increments here were done in
617          * error and sync them down to the hardware as filter flags.
618          */
619         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
620                 atomic_inc(&local->iff_allmultis);
621
622         if (sdata->flags & IEEE80211_SDATA_PROMISC)
623                 atomic_inc(&local->iff_promiscs);
624
625         mutex_lock(&local->mtx);
626         hw_reconf_flags |= __ieee80211_recalc_idle(local);
627         mutex_unlock(&local->mtx);
628
629         if (coming_up)
630                 local->open_count++;
631
632         if (hw_reconf_flags)
633                 ieee80211_hw_config(local, hw_reconf_flags);
634
635         ieee80211_recalc_ps(local, -1);
636
637         if (dev)
638                 netif_tx_start_all_queues(dev);
639
640         return 0;
641  err_del_interface:
642         drv_remove_interface(local, sdata);
643  err_stop:
644         if (!local->open_count)
645                 drv_stop(local);
646  err_del_bss:
647         sdata->bss = NULL;
648         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
649                 list_del(&sdata->u.vlan.list);
650         /* might already be clear but that doesn't matter */
651         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
652         return res;
653 }
654
655 static int ieee80211_open(struct net_device *dev)
656 {
657         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
658         int err;
659
660         /* fail early if user set an invalid address */
661         if (!is_valid_ether_addr(dev->dev_addr))
662                 return -EADDRNOTAVAIL;
663
664         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
665         if (err)
666                 return err;
667
668         return ieee80211_do_open(&sdata->wdev, true);
669 }
670
671 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
672                               bool going_down)
673 {
674         struct ieee80211_local *local = sdata->local;
675         unsigned long flags;
676         struct sk_buff *skb, *tmp;
677         u32 hw_reconf_flags = 0;
678         int i;
679
680         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
681
682         if (rcu_access_pointer(local->scan_sdata) == sdata)
683                 ieee80211_scan_cancel(local);
684
685         /*
686          * Stop TX on this interface first.
687          */
688         if (sdata->dev)
689                 netif_tx_stop_all_queues(sdata->dev);
690
691         ieee80211_roc_purge(sdata);
692
693         /*
694          * Remove all stations associated with this interface.
695          *
696          * This must be done before calling ops->remove_interface()
697          * because otherwise we can later invoke ops->sta_notify()
698          * whenever the STAs are removed, and that invalidates driver
699          * assumptions about always getting a vif pointer that is valid
700          * (because if we remove a STA after ops->remove_interface()
701          * the driver will have removed the vif info already!)
702          *
703          * This is relevant only in AP, WDS and mesh modes, since in
704          * all other modes we've already removed all stations when
705          * disconnecting etc.
706          */
707         sta_info_flush(local, sdata);
708
709         /*
710          * Don't count this interface for promisc/allmulti while it
711          * is down. dev_mc_unsync() will invoke set_multicast_list
712          * on the master interface which will sync these down to the
713          * hardware as filter flags.
714          */
715         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
716                 atomic_dec(&local->iff_allmultis);
717
718         if (sdata->flags & IEEE80211_SDATA_PROMISC)
719                 atomic_dec(&local->iff_promiscs);
720
721         if (sdata->vif.type == NL80211_IFTYPE_AP) {
722                 local->fif_pspoll--;
723                 local->fif_probe_req--;
724         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
725                 local->fif_probe_req--;
726         }
727
728         if (sdata->dev) {
729                 netif_addr_lock_bh(sdata->dev);
730                 spin_lock_bh(&local->filter_lock);
731                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
732                                  sdata->dev->addr_len);
733                 spin_unlock_bh(&local->filter_lock);
734                 netif_addr_unlock_bh(sdata->dev);
735
736                 ieee80211_configure_filter(local);
737         }
738
739         del_timer_sync(&local->dynamic_ps_timer);
740         cancel_work_sync(&local->dynamic_ps_enable_work);
741
742         cancel_work_sync(&sdata->recalc_smps);
743
744         /* APs need special treatment */
745         if (sdata->vif.type == NL80211_IFTYPE_AP) {
746                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
747
748                 /* down all dependent devices, that is VLANs */
749                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
750                                          u.vlan.list)
751                         dev_close(vlan->dev);
752                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
753         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
754                 ieee80211_mgd_stop(sdata);
755         }
756
757         if (going_down)
758                 local->open_count--;
759
760         switch (sdata->vif.type) {
761         case NL80211_IFTYPE_AP_VLAN:
762                 list_del(&sdata->u.vlan.list);
763                 /* no need to tell driver */
764                 break;
765         case NL80211_IFTYPE_MONITOR:
766                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
767                         local->cooked_mntrs--;
768                         break;
769                 }
770
771                 local->monitors--;
772                 if (local->monitors == 0) {
773                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
774                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
775                         ieee80211_del_virtual_monitor(local);
776                 }
777
778                 ieee80211_adjust_monitor_flags(sdata, -1);
779                 ieee80211_configure_filter(local);
780                 break;
781         case NL80211_IFTYPE_P2P_DEVICE:
782                 /* relies on synchronize_rcu() below */
783                 rcu_assign_pointer(local->p2p_sdata, NULL);
784                 /* fall through */
785         default:
786                 flush_work(&sdata->work);
787                 /*
788                  * When we get here, the interface is marked down.
789                  * Call rcu_barrier() to wait both for the RX path
790                  * should it be using the interface and enqueuing
791                  * frames at this very time on another CPU, and
792                  * for the sta free call_rcu callbacks.
793                  */
794                 rcu_barrier();
795
796                 /*
797                  * free_sta_rcu() enqueues a work for the actual
798                  * sta cleanup, so we need to flush it while
799                  * sdata is still valid.
800                  */
801                 flush_workqueue(local->workqueue);
802
803                 skb_queue_purge(&sdata->skb_queue);
804
805                 /*
806                  * Free all remaining keys, there shouldn't be any,
807                  * except maybe group keys in AP more or WDS?
808                  */
809                 ieee80211_free_keys(sdata);
810
811                 if (going_down)
812                         drv_remove_interface(local, sdata);
813         }
814
815         sdata->bss = NULL;
816
817         mutex_lock(&local->mtx);
818         hw_reconf_flags |= __ieee80211_recalc_idle(local);
819         mutex_unlock(&local->mtx);
820
821         ieee80211_recalc_ps(local, -1);
822
823         if (local->open_count == 0) {
824                 if (local->ops->napi_poll)
825                         napi_disable(&local->napi);
826                 ieee80211_clear_tx_pending(local);
827                 ieee80211_stop_device(local);
828
829                 /* no reconfiguring after stop! */
830                 hw_reconf_flags = 0;
831         }
832
833         /* do after stop to avoid reconfiguring when we stop anyway */
834         if (hw_reconf_flags)
835                 ieee80211_hw_config(local, hw_reconf_flags);
836
837         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
838         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
839                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
840                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
841                         if (info->control.vif == &sdata->vif) {
842                                 __skb_unlink(skb, &local->pending[i]);
843                                 ieee80211_free_txskb(&local->hw, skb);
844                         }
845                 }
846         }
847         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
848
849         if (local->monitors == local->open_count && local->monitors > 0)
850                 ieee80211_add_virtual_monitor(local);
851 }
852
853 static int ieee80211_stop(struct net_device *dev)
854 {
855         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
856
857         ieee80211_do_stop(sdata, true);
858
859         return 0;
860 }
861
862 static void ieee80211_set_multicast_list(struct net_device *dev)
863 {
864         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
865         struct ieee80211_local *local = sdata->local;
866         int allmulti, promisc, sdata_allmulti, sdata_promisc;
867
868         allmulti = !!(dev->flags & IFF_ALLMULTI);
869         promisc = !!(dev->flags & IFF_PROMISC);
870         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
871         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
872
873         if (allmulti != sdata_allmulti) {
874                 if (dev->flags & IFF_ALLMULTI)
875                         atomic_inc(&local->iff_allmultis);
876                 else
877                         atomic_dec(&local->iff_allmultis);
878                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
879         }
880
881         if (promisc != sdata_promisc) {
882                 if (dev->flags & IFF_PROMISC)
883                         atomic_inc(&local->iff_promiscs);
884                 else
885                         atomic_dec(&local->iff_promiscs);
886                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
887         }
888         spin_lock_bh(&local->filter_lock);
889         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
890         spin_unlock_bh(&local->filter_lock);
891         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
892 }
893
894 /*
895  * Called when the netdev is removed or, by the code below, before
896  * the interface type changes.
897  */
898 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
899 {
900         struct ieee80211_local *local = sdata->local;
901         int flushed;
902         int i;
903
904         /* free extra data */
905         ieee80211_free_keys(sdata);
906
907         ieee80211_debugfs_remove_netdev(sdata);
908
909         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
910                 __skb_queue_purge(&sdata->fragments[i].skb_list);
911         sdata->fragment_next = 0;
912
913         if (ieee80211_vif_is_mesh(&sdata->vif))
914                 mesh_rmc_free(sdata);
915
916         flushed = sta_info_flush(local, sdata);
917         WARN_ON(flushed);
918 }
919
920 static void ieee80211_uninit(struct net_device *dev)
921 {
922         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
923 }
924
925 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
926                                          struct sk_buff *skb)
927 {
928         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
929 }
930
931 static const struct net_device_ops ieee80211_dataif_ops = {
932         .ndo_open               = ieee80211_open,
933         .ndo_stop               = ieee80211_stop,
934         .ndo_uninit             = ieee80211_uninit,
935         .ndo_start_xmit         = ieee80211_subif_start_xmit,
936         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
937         .ndo_change_mtu         = ieee80211_change_mtu,
938         .ndo_set_mac_address    = ieee80211_change_mac,
939         .ndo_select_queue       = ieee80211_netdev_select_queue,
940 };
941
942 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
943                                           struct sk_buff *skb)
944 {
945         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
946         struct ieee80211_local *local = sdata->local;
947         struct ieee80211_hdr *hdr;
948         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
949
950         if (local->hw.queues < IEEE80211_NUM_ACS)
951                 return 0;
952
953         if (skb->len < 4 ||
954             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
955                 return 0; /* doesn't matter, frame will be dropped */
956
957         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
958
959         return ieee80211_select_queue_80211(sdata, skb, hdr);
960 }
961
962 static const struct net_device_ops ieee80211_monitorif_ops = {
963         .ndo_open               = ieee80211_open,
964         .ndo_stop               = ieee80211_stop,
965         .ndo_uninit             = ieee80211_uninit,
966         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
967         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
968         .ndo_change_mtu         = ieee80211_change_mtu,
969         .ndo_set_mac_address    = eth_mac_addr,
970         .ndo_select_queue       = ieee80211_monitor_select_queue,
971 };
972
973 static void ieee80211_if_setup(struct net_device *dev)
974 {
975         ether_setup(dev);
976         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
977         dev->netdev_ops = &ieee80211_dataif_ops;
978         dev->destructor = free_netdev;
979 }
980
981 static void ieee80211_iface_work(struct work_struct *work)
982 {
983         struct ieee80211_sub_if_data *sdata =
984                 container_of(work, struct ieee80211_sub_if_data, work);
985         struct ieee80211_local *local = sdata->local;
986         struct sk_buff *skb;
987         struct sta_info *sta;
988         struct ieee80211_ra_tid *ra_tid;
989
990         if (!ieee80211_sdata_running(sdata))
991                 return;
992
993         if (local->scanning)
994                 return;
995
996         /*
997          * ieee80211_queue_work() should have picked up most cases,
998          * here we'll pick the rest.
999          */
1000         if (WARN(local->suspended,
1001                  "interface work scheduled while going to suspend\n"))
1002                 return;
1003
1004         /* first process frames */
1005         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1006                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1007
1008                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1009                         ra_tid = (void *)&skb->cb;
1010                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1011                                                  ra_tid->tid);
1012                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1013                         ra_tid = (void *)&skb->cb;
1014                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1015                                                 ra_tid->tid);
1016                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1017                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1018                         int len = skb->len;
1019
1020                         mutex_lock(&local->sta_mtx);
1021                         sta = sta_info_get_bss(sdata, mgmt->sa);
1022                         if (sta) {
1023                                 switch (mgmt->u.action.u.addba_req.action_code) {
1024                                 case WLAN_ACTION_ADDBA_REQ:
1025                                         ieee80211_process_addba_request(
1026                                                         local, sta, mgmt, len);
1027                                         break;
1028                                 case WLAN_ACTION_ADDBA_RESP:
1029                                         ieee80211_process_addba_resp(local, sta,
1030                                                                      mgmt, len);
1031                                         break;
1032                                 case WLAN_ACTION_DELBA:
1033                                         ieee80211_process_delba(sdata, sta,
1034                                                                 mgmt, len);
1035                                         break;
1036                                 default:
1037                                         WARN_ON(1);
1038                                         break;
1039                                 }
1040                         }
1041                         mutex_unlock(&local->sta_mtx);
1042                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1043                         struct ieee80211_hdr *hdr = (void *)mgmt;
1044                         /*
1045                          * So the frame isn't mgmt, but frame_control
1046                          * is at the right place anyway, of course, so
1047                          * the if statement is correct.
1048                          *
1049                          * Warn if we have other data frame types here,
1050                          * they must not get here.
1051                          */
1052                         WARN_ON(hdr->frame_control &
1053                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1054                         WARN_ON(!(hdr->seq_ctrl &
1055                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1056                         /*
1057                          * This was a fragment of a frame, received while
1058                          * a block-ack session was active. That cannot be
1059                          * right, so terminate the session.
1060                          */
1061                         mutex_lock(&local->sta_mtx);
1062                         sta = sta_info_get_bss(sdata, mgmt->sa);
1063                         if (sta) {
1064                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1065                                                 IEEE80211_QOS_CTL_TID_MASK;
1066
1067                                 __ieee80211_stop_rx_ba_session(
1068                                         sta, tid, WLAN_BACK_RECIPIENT,
1069                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1070                                         true);
1071                         }
1072                         mutex_unlock(&local->sta_mtx);
1073                 } else switch (sdata->vif.type) {
1074                 case NL80211_IFTYPE_STATION:
1075                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1076                         break;
1077                 case NL80211_IFTYPE_ADHOC:
1078                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1079                         break;
1080                 case NL80211_IFTYPE_MESH_POINT:
1081                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1082                                 break;
1083                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1084                         break;
1085                 default:
1086                         WARN(1, "frame for unexpected interface type");
1087                         break;
1088                 }
1089
1090                 kfree_skb(skb);
1091         }
1092
1093         /* then other type-dependent work */
1094         switch (sdata->vif.type) {
1095         case NL80211_IFTYPE_STATION:
1096                 ieee80211_sta_work(sdata);
1097                 break;
1098         case NL80211_IFTYPE_ADHOC:
1099                 ieee80211_ibss_work(sdata);
1100                 break;
1101         case NL80211_IFTYPE_MESH_POINT:
1102                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1103                         break;
1104                 ieee80211_mesh_work(sdata);
1105                 break;
1106         default:
1107                 break;
1108         }
1109 }
1110
1111 static void ieee80211_recalc_smps_work(struct work_struct *work)
1112 {
1113         struct ieee80211_sub_if_data *sdata =
1114                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1115
1116         ieee80211_recalc_smps(sdata);
1117 }
1118
1119 /*
1120  * Helper function to initialise an interface to a specific type.
1121  */
1122 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1123                                   enum nl80211_iftype type)
1124 {
1125         /* clear type-dependent union */
1126         memset(&sdata->u, 0, sizeof(sdata->u));
1127
1128         /* and set some type-dependent values */
1129         sdata->vif.type = type;
1130         sdata->vif.p2p = false;
1131         sdata->wdev.iftype = type;
1132
1133         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1134         sdata->control_port_no_encrypt = false;
1135
1136         sdata->noack_map = 0;
1137
1138         /* only monitor/p2p-device differ */
1139         if (sdata->dev) {
1140                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1141                 sdata->dev->type = ARPHRD_ETHER;
1142         }
1143
1144         skb_queue_head_init(&sdata->skb_queue);
1145         INIT_WORK(&sdata->work, ieee80211_iface_work);
1146         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1147
1148         switch (type) {
1149         case NL80211_IFTYPE_P2P_GO:
1150                 type = NL80211_IFTYPE_AP;
1151                 sdata->vif.type = type;
1152                 sdata->vif.p2p = true;
1153                 /* fall through */
1154         case NL80211_IFTYPE_AP:
1155                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1156                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1157                 break;
1158         case NL80211_IFTYPE_P2P_CLIENT:
1159                 type = NL80211_IFTYPE_STATION;
1160                 sdata->vif.type = type;
1161                 sdata->vif.p2p = true;
1162                 /* fall through */
1163         case NL80211_IFTYPE_STATION:
1164                 ieee80211_sta_setup_sdata(sdata);
1165                 break;
1166         case NL80211_IFTYPE_ADHOC:
1167                 ieee80211_ibss_setup_sdata(sdata);
1168                 break;
1169         case NL80211_IFTYPE_MESH_POINT:
1170                 if (ieee80211_vif_is_mesh(&sdata->vif))
1171                         ieee80211_mesh_init_sdata(sdata);
1172                 break;
1173         case NL80211_IFTYPE_MONITOR:
1174                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1175                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1176                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1177                                       MONITOR_FLAG_OTHER_BSS;
1178                 break;
1179         case NL80211_IFTYPE_WDS:
1180         case NL80211_IFTYPE_AP_VLAN:
1181         case NL80211_IFTYPE_P2P_DEVICE:
1182                 break;
1183         case NL80211_IFTYPE_UNSPECIFIED:
1184         case NUM_NL80211_IFTYPES:
1185                 BUG();
1186                 break;
1187         }
1188
1189         ieee80211_debugfs_add_netdev(sdata);
1190 }
1191
1192 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1193                                            enum nl80211_iftype type)
1194 {
1195         struct ieee80211_local *local = sdata->local;
1196         int ret, err;
1197         enum nl80211_iftype internal_type = type;
1198         bool p2p = false;
1199
1200         ASSERT_RTNL();
1201
1202         if (!local->ops->change_interface)
1203                 return -EBUSY;
1204
1205         switch (sdata->vif.type) {
1206         case NL80211_IFTYPE_AP:
1207         case NL80211_IFTYPE_STATION:
1208         case NL80211_IFTYPE_ADHOC:
1209                 /*
1210                  * Could maybe also all others here?
1211                  * Just not sure how that interacts
1212                  * with the RX/config path e.g. for
1213                  * mesh.
1214                  */
1215                 break;
1216         default:
1217                 return -EBUSY;
1218         }
1219
1220         switch (type) {
1221         case NL80211_IFTYPE_AP:
1222         case NL80211_IFTYPE_STATION:
1223         case NL80211_IFTYPE_ADHOC:
1224                 /*
1225                  * Could probably support everything
1226                  * but WDS here (WDS do_open can fail
1227                  * under memory pressure, which this
1228                  * code isn't prepared to handle).
1229                  */
1230                 break;
1231         case NL80211_IFTYPE_P2P_CLIENT:
1232                 p2p = true;
1233                 internal_type = NL80211_IFTYPE_STATION;
1234                 break;
1235         case NL80211_IFTYPE_P2P_GO:
1236                 p2p = true;
1237                 internal_type = NL80211_IFTYPE_AP;
1238                 break;
1239         default:
1240                 return -EBUSY;
1241         }
1242
1243         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1244         if (ret)
1245                 return ret;
1246
1247         ieee80211_do_stop(sdata, false);
1248
1249         ieee80211_teardown_sdata(sdata);
1250
1251         ret = drv_change_interface(local, sdata, internal_type, p2p);
1252         if (ret)
1253                 type = sdata->vif.type;
1254
1255         /*
1256          * Ignore return value here, there's not much we can do since
1257          * the driver changed the interface type internally already.
1258          * The warnings will hopefully make driver authors fix it :-)
1259          */
1260         ieee80211_check_queues(sdata);
1261
1262         ieee80211_setup_sdata(sdata, type);
1263
1264         err = ieee80211_do_open(&sdata->wdev, false);
1265         WARN(err, "type change: do_open returned %d", err);
1266
1267         return ret;
1268 }
1269
1270 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1271                              enum nl80211_iftype type)
1272 {
1273         int ret;
1274
1275         ASSERT_RTNL();
1276
1277         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1278                 return 0;
1279
1280         if (ieee80211_sdata_running(sdata)) {
1281                 ret = ieee80211_runtime_change_iftype(sdata, type);
1282                 if (ret)
1283                         return ret;
1284         } else {
1285                 /* Purge and reset type-dependent state. */
1286                 ieee80211_teardown_sdata(sdata);
1287                 ieee80211_setup_sdata(sdata, type);
1288         }
1289
1290         /* reset some values that shouldn't be kept across type changes */
1291         sdata->drop_unencrypted = 0;
1292         if (type == NL80211_IFTYPE_STATION)
1293                 sdata->u.mgd.use_4addr = false;
1294
1295         return 0;
1296 }
1297
1298 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1299                                        u8 *perm_addr, enum nl80211_iftype type)
1300 {
1301         struct ieee80211_sub_if_data *sdata;
1302         u64 mask, start, addr, val, inc;
1303         u8 *m;
1304         u8 tmp_addr[ETH_ALEN];
1305         int i;
1306
1307         /* default ... something at least */
1308         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1309
1310         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1311             local->hw.wiphy->n_addresses <= 1)
1312                 return;
1313
1314         mutex_lock(&local->iflist_mtx);
1315
1316         switch (type) {
1317         case NL80211_IFTYPE_MONITOR:
1318                 /* doesn't matter */
1319                 break;
1320         case NL80211_IFTYPE_WDS:
1321         case NL80211_IFTYPE_AP_VLAN:
1322                 /* match up with an AP interface */
1323                 list_for_each_entry(sdata, &local->interfaces, list) {
1324                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1325                                 continue;
1326                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1327                         break;
1328                 }
1329                 /* keep default if no AP interface present */
1330                 break;
1331         case NL80211_IFTYPE_P2P_CLIENT:
1332         case NL80211_IFTYPE_P2P_GO:
1333                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1334                         list_for_each_entry(sdata, &local->interfaces, list) {
1335                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1336                                         continue;
1337                                 if (!ieee80211_sdata_running(sdata))
1338                                         continue;
1339                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1340                                 goto out_unlock;
1341                         }
1342                 }
1343                 /* otherwise fall through */
1344         default:
1345                 /* assign a new address if possible -- try n_addresses first */
1346                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1347                         bool used = false;
1348
1349                         list_for_each_entry(sdata, &local->interfaces, list) {
1350                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1351                                            sdata->vif.addr, ETH_ALEN) == 0) {
1352                                         used = true;
1353                                         break;
1354                                 }
1355                         }
1356
1357                         if (!used) {
1358                                 memcpy(perm_addr,
1359                                        local->hw.wiphy->addresses[i].addr,
1360                                        ETH_ALEN);
1361                                 break;
1362                         }
1363                 }
1364
1365                 /* try mask if available */
1366                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1367                         break;
1368
1369                 m = local->hw.wiphy->addr_mask;
1370                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1371                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1372                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1373
1374                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1375                         /* not a contiguous mask ... not handled now! */
1376                         pr_info("not contiguous\n");
1377                         break;
1378                 }
1379
1380                 m = local->hw.wiphy->perm_addr;
1381                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1382                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1383                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1384
1385                 inc = 1ULL<<__ffs64(mask);
1386                 val = (start & mask);
1387                 addr = (start & ~mask) | (val & mask);
1388                 do {
1389                         bool used = false;
1390
1391                         tmp_addr[5] = addr >> 0*8;
1392                         tmp_addr[4] = addr >> 1*8;
1393                         tmp_addr[3] = addr >> 2*8;
1394                         tmp_addr[2] = addr >> 3*8;
1395                         tmp_addr[1] = addr >> 4*8;
1396                         tmp_addr[0] = addr >> 5*8;
1397
1398                         val += inc;
1399
1400                         list_for_each_entry(sdata, &local->interfaces, list) {
1401                                 if (memcmp(tmp_addr, sdata->vif.addr,
1402                                                         ETH_ALEN) == 0) {
1403                                         used = true;
1404                                         break;
1405                                 }
1406                         }
1407
1408                         if (!used) {
1409                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1410                                 break;
1411                         }
1412                         addr = (start & ~mask) | (val & mask);
1413                 } while (addr != start);
1414
1415                 break;
1416         }
1417
1418  out_unlock:
1419         mutex_unlock(&local->iflist_mtx);
1420 }
1421
1422 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1423                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1424                      struct vif_params *params)
1425 {
1426         struct net_device *ndev = NULL;
1427         struct ieee80211_sub_if_data *sdata = NULL;
1428         int ret, i;
1429         int txqs = 1;
1430
1431         ASSERT_RTNL();
1432
1433         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1434                 struct wireless_dev *wdev;
1435
1436                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1437                                 GFP_KERNEL);
1438                 if (!sdata)
1439                         return -ENOMEM;
1440                 wdev = &sdata->wdev;
1441
1442                 sdata->dev = NULL;
1443                 strlcpy(sdata->name, name, IFNAMSIZ);
1444                 ieee80211_assign_perm_addr(local, wdev->address, type);
1445                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1446         } else {
1447                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1448                         txqs = IEEE80211_NUM_ACS;
1449
1450                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1451                                         local->hw.vif_data_size,
1452                                         name, ieee80211_if_setup, txqs, 1);
1453                 if (!ndev)
1454                         return -ENOMEM;
1455                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1456
1457                 ndev->needed_headroom = local->tx_headroom +
1458                                         4*6 /* four MAC addresses */
1459                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1460                                         + 6 /* mesh */
1461                                         + 8 /* rfc1042/bridge tunnel */
1462                                         - ETH_HLEN /* ethernet hard_header_len */
1463                                         + IEEE80211_ENCRYPT_HEADROOM;
1464                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1465
1466                 ret = dev_alloc_name(ndev, ndev->name);
1467                 if (ret < 0) {
1468                         free_netdev(ndev);
1469                         return ret;
1470                 }
1471
1472                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1473                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1474                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1475
1476                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1477                 sdata = netdev_priv(ndev);
1478                 ndev->ieee80211_ptr = &sdata->wdev;
1479                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1480                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1481
1482                 sdata->dev = ndev;
1483         }
1484
1485         /* initialise type-independent data */
1486         sdata->wdev.wiphy = local->hw.wiphy;
1487         sdata->local = local;
1488 #ifdef CONFIG_INET
1489         sdata->arp_filter_state = true;
1490 #endif
1491
1492         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1493                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1494
1495         INIT_LIST_HEAD(&sdata->key_list);
1496
1497         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1498                 struct ieee80211_supported_band *sband;
1499                 sband = local->hw.wiphy->bands[i];
1500                 sdata->rc_rateidx_mask[i] =
1501                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1502                 if (sband)
1503                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1504                                sband->ht_cap.mcs.rx_mask,
1505                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1506                 else
1507                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1508                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1509         }
1510
1511         ieee80211_set_default_queues(sdata);
1512
1513         /* setup type-dependent data */
1514         ieee80211_setup_sdata(sdata, type);
1515
1516         if (ndev) {
1517                 if (params) {
1518                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1519                         if (type == NL80211_IFTYPE_STATION)
1520                                 sdata->u.mgd.use_4addr = params->use_4addr;
1521                 }
1522
1523                 ndev->features |= local->hw.netdev_features;
1524
1525                 ret = register_netdevice(ndev);
1526                 if (ret) {
1527                         free_netdev(ndev);
1528                         return ret;
1529                 }
1530         }
1531
1532         mutex_lock(&local->iflist_mtx);
1533         list_add_tail_rcu(&sdata->list, &local->interfaces);
1534         mutex_unlock(&local->iflist_mtx);
1535
1536         if (new_wdev)
1537                 *new_wdev = &sdata->wdev;
1538
1539         return 0;
1540 }
1541
1542 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1543 {
1544         ASSERT_RTNL();
1545
1546         mutex_lock(&sdata->local->iflist_mtx);
1547         list_del_rcu(&sdata->list);
1548         mutex_unlock(&sdata->local->iflist_mtx);
1549
1550         synchronize_rcu();
1551
1552         if (sdata->dev) {
1553                 unregister_netdevice(sdata->dev);
1554         } else {
1555                 cfg80211_unregister_wdev(&sdata->wdev);
1556                 kfree(sdata);
1557         }
1558 }
1559
1560 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1561 {
1562         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1563                 return;
1564         ieee80211_do_stop(sdata, true);
1565         ieee80211_teardown_sdata(sdata);
1566 }
1567
1568 /*
1569  * Remove all interfaces, may only be called at hardware unregistration
1570  * time because it doesn't do RCU-safe list removals.
1571  */
1572 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1573 {
1574         struct ieee80211_sub_if_data *sdata, *tmp;
1575         LIST_HEAD(unreg_list);
1576         LIST_HEAD(wdev_list);
1577
1578         ASSERT_RTNL();
1579
1580         mutex_lock(&local->iflist_mtx);
1581         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1582                 list_del(&sdata->list);
1583
1584                 if (sdata->dev)
1585                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1586                 else
1587                         list_add(&sdata->list, &wdev_list);
1588         }
1589         mutex_unlock(&local->iflist_mtx);
1590         unregister_netdevice_many(&unreg_list);
1591         list_del(&unreg_list);
1592
1593         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1594                 list_del(&sdata->list);
1595                 cfg80211_unregister_wdev(&sdata->wdev);
1596                 kfree(sdata);
1597         }
1598 }
1599
1600 static int netdev_notify(struct notifier_block *nb,
1601                          unsigned long state,
1602                          void *ndev)
1603 {
1604         struct net_device *dev = ndev;
1605         struct ieee80211_sub_if_data *sdata;
1606
1607         if (state != NETDEV_CHANGENAME)
1608                 return 0;
1609
1610         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1611                 return 0;
1612
1613         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1614                 return 0;
1615
1616         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1617
1618         memcpy(sdata->name, dev->name, IFNAMSIZ);
1619
1620         ieee80211_debugfs_rename_netdev(sdata);
1621         return 0;
1622 }
1623
1624 static struct notifier_block mac80211_netdev_notifier = {
1625         .notifier_call = netdev_notify,
1626 };
1627
1628 int ieee80211_iface_init(void)
1629 {
1630         return register_netdevice_notifier(&mac80211_netdev_notifier);
1631 }
1632
1633 void ieee80211_iface_exit(void)
1634 {
1635         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1636 }