mac80211: replace some dead code by a warning
[linux-3.10.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling
3  *
4  * Copyright 2002-2005, Instant802 Networks, Inc.
5  * Copyright 2005-2006, Devicescape Software, Inc.
6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30  * DOC: Interface list locking
31  *
32  * The interface list in each struct ieee80211_local is protected
33  * three-fold:
34  *
35  * (1) modifications may only be done under the RTNL
36  * (2) modifications and readers are protected against each other by
37  *     the iflist_mtx.
38  * (3) modifications are done in an RCU manner so atomic readers
39  *     can traverse the list in RCU-safe blocks.
40  *
41  * As a consequence, reads (traversals) of the list can be protected
42  * by either the RTNL, the iflist_mtx or RCU.
43  */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47         struct ieee80211_chanctx_conf *chanctx_conf;
48         int power;
49
50         rcu_read_lock();
51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52         if (!chanctx_conf) {
53                 rcu_read_unlock();
54                 return false;
55         }
56
57         power = chanctx_conf->def.chan->max_power;
58         rcu_read_unlock();
59
60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61                 power = min(power, sdata->user_power_level);
62
63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64                 power = min(power, sdata->ap_power_level);
65
66         if (power != sdata->vif.bss_conf.txpower) {
67                 sdata->vif.bss_conf.txpower = power;
68                 ieee80211_hw_config(sdata->local, 0);
69                 return true;
70         }
71
72         return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77         if (__ieee80211_recalc_txpower(sdata))
78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 ieee80211_idle_off(struct ieee80211_local *local)
82 {
83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84                 return 0;
85
86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87         return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 ieee80211_idle_on(struct ieee80211_local *local)
91 {
92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93                 return 0;
94
95         ieee80211_flush_queues(local, NULL);
96
97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98         return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 void ieee80211_recalc_idle(struct ieee80211_local *local)
102 {
103         bool working = false, scanning, active;
104         unsigned int led_trig_start = 0, led_trig_stop = 0;
105         struct ieee80211_roc_work *roc;
106         u32 change;
107
108         lockdep_assert_held(&local->mtx);
109
110         active = !list_empty(&local->chanctx_list) || local->monitors;
111
112         if (!local->ops->remain_on_channel) {
113                 list_for_each_entry(roc, &local->roc_list, list) {
114                         working = true;
115                         break;
116                 }
117         }
118
119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121
122         if (working || scanning)
123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124         else
125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126
127         if (active)
128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129         else
130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131
132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133
134         if (working || scanning || active)
135                 change = ieee80211_idle_off(local);
136         else
137                 change = ieee80211_idle_on(local);
138         if (change)
139                 ieee80211_hw_config(local, change);
140 }
141
142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
143 {
144         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
145                 return -EINVAL;
146
147         dev->mtu = new_mtu;
148         return 0;
149 }
150
151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
152 {
153         struct ieee80211_sub_if_data *sdata;
154         u64 new, mask, tmp;
155         u8 *m;
156         int ret = 0;
157
158         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
159                 return 0;
160
161         m = addr;
162         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
163                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
164                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
165
166         m = local->hw.wiphy->addr_mask;
167         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171
172         mutex_lock(&local->iflist_mtx);
173         list_for_each_entry(sdata, &local->interfaces, list) {
174                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
175                         continue;
176
177                 m = sdata->vif.addr;
178                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181
182                 if ((new & ~mask) != (tmp & ~mask)) {
183                         ret = -EINVAL;
184                         break;
185                 }
186         }
187         mutex_unlock(&local->iflist_mtx);
188
189         return ret;
190 }
191
192 static int ieee80211_change_mac(struct net_device *dev, void *addr)
193 {
194         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
195         struct sockaddr *sa = addr;
196         int ret;
197
198         if (ieee80211_sdata_running(sdata))
199                 return -EBUSY;
200
201         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
202         if (ret)
203                 return ret;
204
205         ret = eth_mac_addr(dev, sa);
206
207         if (ret == 0)
208                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
209
210         return ret;
211 }
212
213 static inline int identical_mac_addr_allowed(int type1, int type2)
214 {
215         return type1 == NL80211_IFTYPE_MONITOR ||
216                 type2 == NL80211_IFTYPE_MONITOR ||
217                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
218                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
219                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
220                 (type1 == NL80211_IFTYPE_WDS &&
221                         (type2 == NL80211_IFTYPE_WDS ||
222                          type2 == NL80211_IFTYPE_AP)) ||
223                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
224                 (type1 == NL80211_IFTYPE_AP_VLAN &&
225                         (type2 == NL80211_IFTYPE_AP ||
226                          type2 == NL80211_IFTYPE_AP_VLAN));
227 }
228
229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
230                                             enum nl80211_iftype iftype)
231 {
232         struct ieee80211_local *local = sdata->local;
233         struct ieee80211_sub_if_data *nsdata;
234
235         ASSERT_RTNL();
236
237         /* we hold the RTNL here so can safely walk the list */
238         list_for_each_entry(nsdata, &local->interfaces, list) {
239                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
240                         /*
241                          * Allow only a single IBSS interface to be up at any
242                          * time. This is restricted because beacon distribution
243                          * cannot work properly if both are in the same IBSS.
244                          *
245                          * To remove this restriction we'd have to disallow them
246                          * from setting the same SSID on different IBSS interfaces
247                          * belonging to the same hardware. Then, however, we're
248                          * faced with having to adopt two different TSF timers...
249                          */
250                         if (iftype == NL80211_IFTYPE_ADHOC &&
251                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
252                                 return -EBUSY;
253
254                         /*
255                          * The remaining checks are only performed for interfaces
256                          * with the same MAC address.
257                          */
258                         if (!ether_addr_equal(sdata->vif.addr,
259                                               nsdata->vif.addr))
260                                 continue;
261
262                         /*
263                          * check whether it may have the same address
264                          */
265                         if (!identical_mac_addr_allowed(iftype,
266                                                         nsdata->vif.type))
267                                 return -ENOTUNIQ;
268
269                         /*
270                          * can only add VLANs to enabled APs
271                          */
272                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
273                             nsdata->vif.type == NL80211_IFTYPE_AP)
274                                 sdata->bss = &nsdata->u.ap;
275                 }
276         }
277
278         return 0;
279 }
280
281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
282 {
283         int n_queues = sdata->local->hw.queues;
284         int i;
285
286         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
287                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
288                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
289                                          IEEE80211_INVAL_HW_QUEUE))
290                                 return -EINVAL;
291                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
292                                          n_queues))
293                                 return -EINVAL;
294                 }
295         }
296
297         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
298              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
299             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
300                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
301                 return 0;
302         }
303
304         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
305                 return -EINVAL;
306
307         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
308                 return -EINVAL;
309
310         return 0;
311 }
312
313 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
314                                     const int offset)
315 {
316         struct ieee80211_local *local = sdata->local;
317         u32 flags = sdata->u.mntr_flags;
318
319 #define ADJUST(_f, _s)  do {                                    \
320         if (flags & MONITOR_FLAG_##_f)                          \
321                 local->fif_##_s += offset;                      \
322         } while (0)
323
324         ADJUST(FCSFAIL, fcsfail);
325         ADJUST(PLCPFAIL, plcpfail);
326         ADJUST(CONTROL, control);
327         ADJUST(CONTROL, pspoll);
328         ADJUST(OTHER_BSS, other_bss);
329
330 #undef ADJUST
331 }
332
333 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
334 {
335         struct ieee80211_local *local = sdata->local;
336         int i;
337
338         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
339                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
340                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
341                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
342                         sdata->vif.hw_queue[i] = i;
343                 else
344                         sdata->vif.hw_queue[i] = 0;
345         }
346         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
347 }
348
349 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
350 {
351         struct ieee80211_sub_if_data *sdata;
352         int ret = 0;
353
354         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
355                 return 0;
356
357         mutex_lock(&local->iflist_mtx);
358
359         if (local->monitor_sdata)
360                 goto out_unlock;
361
362         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
363         if (!sdata) {
364                 ret = -ENOMEM;
365                 goto out_unlock;
366         }
367
368         /* set up data */
369         sdata->local = local;
370         sdata->vif.type = NL80211_IFTYPE_MONITOR;
371         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
372                  wiphy_name(local->hw.wiphy));
373
374         ieee80211_set_default_queues(sdata);
375
376         ret = drv_add_interface(local, sdata);
377         if (WARN_ON(ret)) {
378                 /* ok .. stupid driver, it asked for this! */
379                 kfree(sdata);
380                 goto out_unlock;
381         }
382
383         ret = ieee80211_check_queues(sdata);
384         if (ret) {
385                 kfree(sdata);
386                 goto out_unlock;
387         }
388
389         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
390                                         IEEE80211_CHANCTX_EXCLUSIVE);
391         if (ret) {
392                 drv_remove_interface(local, sdata);
393                 kfree(sdata);
394                 goto out_unlock;
395         }
396
397         rcu_assign_pointer(local->monitor_sdata, sdata);
398  out_unlock:
399         mutex_unlock(&local->iflist_mtx);
400         return ret;
401 }
402
403 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
404 {
405         struct ieee80211_sub_if_data *sdata;
406
407         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
408                 return;
409
410         mutex_lock(&local->iflist_mtx);
411
412         sdata = rcu_dereference_protected(local->monitor_sdata,
413                                           lockdep_is_held(&local->iflist_mtx));
414         if (!sdata)
415                 goto out_unlock;
416
417         rcu_assign_pointer(local->monitor_sdata, NULL);
418         synchronize_net();
419
420         ieee80211_vif_release_channel(sdata);
421
422         drv_remove_interface(local, sdata);
423
424         kfree(sdata);
425  out_unlock:
426         mutex_unlock(&local->iflist_mtx);
427 }
428
429 /*
430  * NOTE: Be very careful when changing this function, it must NOT return
431  * an error on interface type changes that have been pre-checked, so most
432  * checks should be in ieee80211_check_concurrent_iface.
433  */
434 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
435 {
436         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
437         struct net_device *dev = wdev->netdev;
438         struct ieee80211_local *local = sdata->local;
439         struct sta_info *sta;
440         u32 changed = 0;
441         int res;
442         u32 hw_reconf_flags = 0;
443
444         switch (sdata->vif.type) {
445         case NL80211_IFTYPE_WDS:
446                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
447                         return -ENOLINK;
448                 break;
449         case NL80211_IFTYPE_AP_VLAN: {
450                 struct ieee80211_sub_if_data *master;
451
452                 if (!sdata->bss)
453                         return -ENOLINK;
454
455                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
456
457                 master = container_of(sdata->bss,
458                                       struct ieee80211_sub_if_data, u.ap);
459                 sdata->control_port_protocol =
460                         master->control_port_protocol;
461                 sdata->control_port_no_encrypt =
462                         master->control_port_no_encrypt;
463                 break;
464                 }
465         case NL80211_IFTYPE_AP:
466                 sdata->bss = &sdata->u.ap;
467                 break;
468         case NL80211_IFTYPE_MESH_POINT:
469         case NL80211_IFTYPE_STATION:
470         case NL80211_IFTYPE_MONITOR:
471         case NL80211_IFTYPE_ADHOC:
472         case NL80211_IFTYPE_P2P_DEVICE:
473                 /* no special treatment */
474                 break;
475         case NL80211_IFTYPE_UNSPECIFIED:
476         case NUM_NL80211_IFTYPES:
477         case NL80211_IFTYPE_P2P_CLIENT:
478         case NL80211_IFTYPE_P2P_GO:
479                 /* cannot happen */
480                 WARN_ON(1);
481                 break;
482         }
483
484         if (local->open_count == 0) {
485                 res = drv_start(local);
486                 if (res)
487                         goto err_del_bss;
488                 /* we're brought up, everything changes */
489                 hw_reconf_flags = ~0;
490                 ieee80211_led_radio(local, true);
491                 ieee80211_mod_tpt_led_trig(local,
492                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
493         }
494
495         /*
496          * Copy the hopefully now-present MAC address to
497          * this interface, if it has the special null one.
498          */
499         if (dev && is_zero_ether_addr(dev->dev_addr)) {
500                 memcpy(dev->dev_addr,
501                        local->hw.wiphy->perm_addr,
502                        ETH_ALEN);
503                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
504
505                 if (!is_valid_ether_addr(dev->dev_addr)) {
506                         res = -EADDRNOTAVAIL;
507                         goto err_stop;
508                 }
509         }
510
511         switch (sdata->vif.type) {
512         case NL80211_IFTYPE_AP_VLAN:
513                 /* no need to tell driver, but set carrier and chanctx */
514                 if (rtnl_dereference(sdata->bss->beacon)) {
515                         ieee80211_vif_vlan_copy_chanctx(sdata);
516                         netif_carrier_on(dev);
517                 } else {
518                         netif_carrier_off(dev);
519                 }
520                 break;
521         case NL80211_IFTYPE_MONITOR:
522                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
523                         local->cooked_mntrs++;
524                         break;
525                 }
526
527                 if (local->monitors == 0 && local->open_count == 0) {
528                         res = ieee80211_add_virtual_monitor(local);
529                         if (res)
530                                 goto err_stop;
531                 }
532
533                 /* must be before the call to ieee80211_configure_filter */
534                 local->monitors++;
535                 if (local->monitors == 1) {
536                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
537                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
538                 }
539
540                 ieee80211_adjust_monitor_flags(sdata, 1);
541                 ieee80211_configure_filter(local);
542                 mutex_lock(&local->mtx);
543                 ieee80211_recalc_idle(local);
544                 mutex_unlock(&local->mtx);
545
546                 netif_carrier_on(dev);
547                 break;
548         default:
549                 if (coming_up) {
550                         ieee80211_del_virtual_monitor(local);
551
552                         res = drv_add_interface(local, sdata);
553                         if (res)
554                                 goto err_stop;
555                         res = ieee80211_check_queues(sdata);
556                         if (res)
557                                 goto err_del_interface;
558                 }
559
560                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
561                         local->fif_pspoll++;
562                         local->fif_probe_req++;
563
564                         ieee80211_configure_filter(local);
565                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
566                         local->fif_probe_req++;
567                 }
568
569                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
570                         changed |= ieee80211_reset_erp_info(sdata);
571                 ieee80211_bss_info_change_notify(sdata, changed);
572
573                 switch (sdata->vif.type) {
574                 case NL80211_IFTYPE_STATION:
575                 case NL80211_IFTYPE_ADHOC:
576                 case NL80211_IFTYPE_AP:
577                 case NL80211_IFTYPE_MESH_POINT:
578                         netif_carrier_off(dev);
579                         break;
580                 case NL80211_IFTYPE_WDS:
581                 case NL80211_IFTYPE_P2P_DEVICE:
582                         break;
583                 default:
584                         /* not reached */
585                         WARN_ON(1);
586                 }
587
588                 /*
589                  * set default queue parameters so drivers don't
590                  * need to initialise the hardware if the hardware
591                  * doesn't start up with sane defaults
592                  */
593                 ieee80211_set_wmm_default(sdata, true);
594         }
595
596         set_bit(SDATA_STATE_RUNNING, &sdata->state);
597
598         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
599                 /* Create STA entry for the WDS peer */
600                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
601                                      GFP_KERNEL);
602                 if (!sta) {
603                         res = -ENOMEM;
604                         goto err_del_interface;
605                 }
606
607                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
608                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
609                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
610
611                 res = sta_info_insert(sta);
612                 if (res) {
613                         /* STA has been freed */
614                         goto err_del_interface;
615                 }
616
617                 rate_control_rate_init(sta);
618                 netif_carrier_on(dev);
619         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
620                 rcu_assign_pointer(local->p2p_sdata, sdata);
621         }
622
623         /*
624          * set_multicast_list will be invoked by the networking core
625          * which will check whether any increments here were done in
626          * error and sync them down to the hardware as filter flags.
627          */
628         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
629                 atomic_inc(&local->iff_allmultis);
630
631         if (sdata->flags & IEEE80211_SDATA_PROMISC)
632                 atomic_inc(&local->iff_promiscs);
633
634         if (coming_up)
635                 local->open_count++;
636
637         if (hw_reconf_flags)
638                 ieee80211_hw_config(local, hw_reconf_flags);
639
640         ieee80211_recalc_ps(local, -1);
641
642         if (dev)
643                 netif_tx_start_all_queues(dev);
644
645         return 0;
646  err_del_interface:
647         drv_remove_interface(local, sdata);
648  err_stop:
649         if (!local->open_count)
650                 drv_stop(local);
651  err_del_bss:
652         sdata->bss = NULL;
653         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
654                 list_del(&sdata->u.vlan.list);
655         /* might already be clear but that doesn't matter */
656         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
657         return res;
658 }
659
660 static int ieee80211_open(struct net_device *dev)
661 {
662         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
663         int err;
664
665         /* fail early if user set an invalid address */
666         if (!is_valid_ether_addr(dev->dev_addr))
667                 return -EADDRNOTAVAIL;
668
669         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
670         if (err)
671                 return err;
672
673         return ieee80211_do_open(&sdata->wdev, true);
674 }
675
676 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
677                               bool going_down)
678 {
679         struct ieee80211_local *local = sdata->local;
680         unsigned long flags;
681         struct sk_buff *skb, *tmp;
682         u32 hw_reconf_flags = 0;
683         int i, flushed;
684         struct ps_data *ps;
685
686         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
687
688         if (rcu_access_pointer(local->scan_sdata) == sdata)
689                 ieee80211_scan_cancel(local);
690
691         /*
692          * Stop TX on this interface first.
693          */
694         if (sdata->dev)
695                 netif_tx_stop_all_queues(sdata->dev);
696
697         ieee80211_roc_purge(local, sdata);
698
699         if (sdata->vif.type == NL80211_IFTYPE_STATION)
700                 ieee80211_mgd_stop(sdata);
701
702         /*
703          * Remove all stations associated with this interface.
704          *
705          * This must be done before calling ops->remove_interface()
706          * because otherwise we can later invoke ops->sta_notify()
707          * whenever the STAs are removed, and that invalidates driver
708          * assumptions about always getting a vif pointer that is valid
709          * (because if we remove a STA after ops->remove_interface()
710          * the driver will have removed the vif info already!)
711          *
712          * This is relevant only in WDS mode, in all other modes we've
713          * already removed all stations when disconnecting or similar,
714          * so warn otherwise.
715          *
716          * We call sta_info_flush_cleanup() later, to combine RCU waits.
717          */
718         flushed = sta_info_flush_defer(sdata);
719         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
720                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
721
722         /* don't count this interface for promisc/allmulti while it is down */
723         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
724                 atomic_dec(&local->iff_allmultis);
725
726         if (sdata->flags & IEEE80211_SDATA_PROMISC)
727                 atomic_dec(&local->iff_promiscs);
728
729         if (sdata->vif.type == NL80211_IFTYPE_AP) {
730                 local->fif_pspoll--;
731                 local->fif_probe_req--;
732         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
733                 local->fif_probe_req--;
734         }
735
736         if (sdata->dev) {
737                 netif_addr_lock_bh(sdata->dev);
738                 spin_lock_bh(&local->filter_lock);
739                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
740                                  sdata->dev->addr_len);
741                 spin_unlock_bh(&local->filter_lock);
742                 netif_addr_unlock_bh(sdata->dev);
743         }
744
745         del_timer_sync(&local->dynamic_ps_timer);
746         cancel_work_sync(&local->dynamic_ps_enable_work);
747
748         cancel_work_sync(&sdata->recalc_smps);
749
750         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
751
752         if (sdata->wdev.cac_started) {
753                 WARN_ON(local->suspended);
754                 mutex_lock(&local->iflist_mtx);
755                 ieee80211_vif_release_channel(sdata);
756                 mutex_unlock(&local->iflist_mtx);
757                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
758                                    GFP_KERNEL);
759         }
760
761         /* APs need special treatment */
762         if (sdata->vif.type == NL80211_IFTYPE_AP) {
763                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
764
765                 /* down all dependent devices, that is VLANs */
766                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
767                                          u.vlan.list)
768                         dev_close(vlan->dev);
769                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
770         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
771                 /* remove all packets in parent bc_buf pointing to this dev */
772                 ps = &sdata->bss->ps;
773
774                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
775                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
776                         if (skb->dev == sdata->dev) {
777                                 __skb_unlink(skb, &ps->bc_buf);
778                                 local->total_ps_buffered--;
779                                 ieee80211_free_txskb(&local->hw, skb);
780                         }
781                 }
782                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
783         }
784
785         if (going_down)
786                 local->open_count--;
787
788         switch (sdata->vif.type) {
789         case NL80211_IFTYPE_AP_VLAN:
790                 list_del(&sdata->u.vlan.list);
791                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
792                 /* no need to tell driver */
793                 break;
794         case NL80211_IFTYPE_MONITOR:
795                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
796                         local->cooked_mntrs--;
797                         break;
798                 }
799
800                 local->monitors--;
801                 if (local->monitors == 0) {
802                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
803                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
804                 }
805
806                 ieee80211_adjust_monitor_flags(sdata, -1);
807                 break;
808         case NL80211_IFTYPE_P2P_DEVICE:
809                 /* relies on synchronize_rcu() below */
810                 rcu_assign_pointer(local->p2p_sdata, NULL);
811                 /* fall through */
812         default:
813                 cancel_work_sync(&sdata->work);
814                 /*
815                  * When we get here, the interface is marked down.
816                  *
817                  * sta_info_flush_cleanup() requires rcu_barrier()
818                  * first to wait for the station call_rcu() calls
819                  * to complete, here we need at least sychronize_rcu()
820                  * it to wait for the RX path in case it is using the
821                  * interface and enqueuing frames at this very time on
822                  * another CPU.
823                  */
824                 rcu_barrier();
825                 sta_info_flush_cleanup(sdata);
826
827                 /*
828                  * Free all remaining keys, there shouldn't be any,
829                  * except maybe in WDS mode?
830                  */
831                 ieee80211_free_keys(sdata);
832
833                 /* fall through */
834         case NL80211_IFTYPE_AP:
835                 skb_queue_purge(&sdata->skb_queue);
836         }
837
838         sdata->bss = NULL;
839
840         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
841         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
842                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
843                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
844                         if (info->control.vif == &sdata->vif) {
845                                 __skb_unlink(skb, &local->pending[i]);
846                                 ieee80211_free_txskb(&local->hw, skb);
847                         }
848                 }
849         }
850         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
851
852         if (local->open_count == 0)
853                 ieee80211_clear_tx_pending(local);
854
855         /*
856          * If the interface goes down while suspended, presumably because
857          * the device was unplugged and that happens before our resume,
858          * then the driver is already unconfigured and the remainder of
859          * this function isn't needed.
860          * XXX: what about WoWLAN? If the device has software state, e.g.
861          *      memory allocated, it might expect teardown commands from
862          *      mac80211 here?
863          */
864         if (local->suspended) {
865                 WARN_ON(local->wowlan);
866                 WARN_ON(rtnl_dereference(local->monitor_sdata));
867                 return;
868         }
869
870         switch (sdata->vif.type) {
871         case NL80211_IFTYPE_AP_VLAN:
872                 break;
873         case NL80211_IFTYPE_MONITOR:
874                 if (local->monitors == 0)
875                         ieee80211_del_virtual_monitor(local);
876
877                 mutex_lock(&local->mtx);
878                 ieee80211_recalc_idle(local);
879                 mutex_unlock(&local->mtx);
880                 break;
881         default:
882                 if (going_down)
883                         drv_remove_interface(local, sdata);
884         }
885
886         ieee80211_recalc_ps(local, -1);
887
888         if (local->open_count == 0) {
889                 ieee80211_stop_device(local);
890
891                 /* no reconfiguring after stop! */
892                 return;
893         }
894
895         /* do after stop to avoid reconfiguring when we stop anyway */
896         ieee80211_configure_filter(local);
897         ieee80211_hw_config(local, hw_reconf_flags);
898
899         if (local->monitors == local->open_count)
900                 ieee80211_add_virtual_monitor(local);
901 }
902
903 static int ieee80211_stop(struct net_device *dev)
904 {
905         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
906
907         ieee80211_do_stop(sdata, true);
908
909         return 0;
910 }
911
912 static void ieee80211_set_multicast_list(struct net_device *dev)
913 {
914         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
915         struct ieee80211_local *local = sdata->local;
916         int allmulti, promisc, sdata_allmulti, sdata_promisc;
917
918         allmulti = !!(dev->flags & IFF_ALLMULTI);
919         promisc = !!(dev->flags & IFF_PROMISC);
920         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
921         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
922
923         if (allmulti != sdata_allmulti) {
924                 if (dev->flags & IFF_ALLMULTI)
925                         atomic_inc(&local->iff_allmultis);
926                 else
927                         atomic_dec(&local->iff_allmultis);
928                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
929         }
930
931         if (promisc != sdata_promisc) {
932                 if (dev->flags & IFF_PROMISC)
933                         atomic_inc(&local->iff_promiscs);
934                 else
935                         atomic_dec(&local->iff_promiscs);
936                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
937         }
938
939         /*
940          * TODO: If somebody needs this on AP interfaces,
941          *       it can be enabled easily but multicast
942          *       addresses from VLANs need to be synced.
943          */
944         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
945             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
946             sdata->vif.type != NL80211_IFTYPE_AP)
947                 drv_set_multicast_list(local, sdata, &dev->mc);
948
949         spin_lock_bh(&local->filter_lock);
950         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
951         spin_unlock_bh(&local->filter_lock);
952         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
953 }
954
955 /*
956  * Called when the netdev is removed or, by the code below, before
957  * the interface type changes.
958  */
959 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
960 {
961         int flushed;
962         int i;
963
964         /* free extra data */
965         ieee80211_free_keys(sdata);
966
967         ieee80211_debugfs_remove_netdev(sdata);
968
969         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
970                 __skb_queue_purge(&sdata->fragments[i].skb_list);
971         sdata->fragment_next = 0;
972
973         if (ieee80211_vif_is_mesh(&sdata->vif))
974                 mesh_rmc_free(sdata);
975
976         flushed = sta_info_flush(sdata);
977         WARN_ON(flushed);
978 }
979
980 static void ieee80211_uninit(struct net_device *dev)
981 {
982         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
983 }
984
985 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
986                                          struct sk_buff *skb)
987 {
988         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
989 }
990
991 static const struct net_device_ops ieee80211_dataif_ops = {
992         .ndo_open               = ieee80211_open,
993         .ndo_stop               = ieee80211_stop,
994         .ndo_uninit             = ieee80211_uninit,
995         .ndo_start_xmit         = ieee80211_subif_start_xmit,
996         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
997         .ndo_change_mtu         = ieee80211_change_mtu,
998         .ndo_set_mac_address    = ieee80211_change_mac,
999         .ndo_select_queue       = ieee80211_netdev_select_queue,
1000 };
1001
1002 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1003                                           struct sk_buff *skb)
1004 {
1005         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1006         struct ieee80211_local *local = sdata->local;
1007         struct ieee80211_hdr *hdr;
1008         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1009
1010         if (local->hw.queues < IEEE80211_NUM_ACS)
1011                 return 0;
1012
1013         if (skb->len < 4 ||
1014             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1015                 return 0; /* doesn't matter, frame will be dropped */
1016
1017         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1018
1019         return ieee80211_select_queue_80211(sdata, skb, hdr);
1020 }
1021
1022 static const struct net_device_ops ieee80211_monitorif_ops = {
1023         .ndo_open               = ieee80211_open,
1024         .ndo_stop               = ieee80211_stop,
1025         .ndo_uninit             = ieee80211_uninit,
1026         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1027         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1028         .ndo_change_mtu         = ieee80211_change_mtu,
1029         .ndo_set_mac_address    = eth_mac_addr,
1030         .ndo_select_queue       = ieee80211_monitor_select_queue,
1031 };
1032
1033 static void ieee80211_if_setup(struct net_device *dev)
1034 {
1035         ether_setup(dev);
1036         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1037         dev->netdev_ops = &ieee80211_dataif_ops;
1038         dev->destructor = free_netdev;
1039 }
1040
1041 static void ieee80211_iface_work(struct work_struct *work)
1042 {
1043         struct ieee80211_sub_if_data *sdata =
1044                 container_of(work, struct ieee80211_sub_if_data, work);
1045         struct ieee80211_local *local = sdata->local;
1046         struct sk_buff *skb;
1047         struct sta_info *sta;
1048         struct ieee80211_ra_tid *ra_tid;
1049
1050         if (!ieee80211_sdata_running(sdata))
1051                 return;
1052
1053         if (local->scanning)
1054                 return;
1055
1056         /*
1057          * ieee80211_queue_work() should have picked up most cases,
1058          * here we'll pick the rest.
1059          */
1060         if (WARN(local->suspended,
1061                  "interface work scheduled while going to suspend\n"))
1062                 return;
1063
1064         /* first process frames */
1065         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1066                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1067
1068                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1069                         ra_tid = (void *)&skb->cb;
1070                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1071                                                  ra_tid->tid);
1072                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1073                         ra_tid = (void *)&skb->cb;
1074                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1075                                                 ra_tid->tid);
1076                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1077                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1078                         int len = skb->len;
1079
1080                         mutex_lock(&local->sta_mtx);
1081                         sta = sta_info_get_bss(sdata, mgmt->sa);
1082                         if (sta) {
1083                                 switch (mgmt->u.action.u.addba_req.action_code) {
1084                                 case WLAN_ACTION_ADDBA_REQ:
1085                                         ieee80211_process_addba_request(
1086                                                         local, sta, mgmt, len);
1087                                         break;
1088                                 case WLAN_ACTION_ADDBA_RESP:
1089                                         ieee80211_process_addba_resp(local, sta,
1090                                                                      mgmt, len);
1091                                         break;
1092                                 case WLAN_ACTION_DELBA:
1093                                         ieee80211_process_delba(sdata, sta,
1094                                                                 mgmt, len);
1095                                         break;
1096                                 default:
1097                                         WARN_ON(1);
1098                                         break;
1099                                 }
1100                         }
1101                         mutex_unlock(&local->sta_mtx);
1102                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1103                         struct ieee80211_hdr *hdr = (void *)mgmt;
1104                         /*
1105                          * So the frame isn't mgmt, but frame_control
1106                          * is at the right place anyway, of course, so
1107                          * the if statement is correct.
1108                          *
1109                          * Warn if we have other data frame types here,
1110                          * they must not get here.
1111                          */
1112                         WARN_ON(hdr->frame_control &
1113                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1114                         WARN_ON(!(hdr->seq_ctrl &
1115                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1116                         /*
1117                          * This was a fragment of a frame, received while
1118                          * a block-ack session was active. That cannot be
1119                          * right, so terminate the session.
1120                          */
1121                         mutex_lock(&local->sta_mtx);
1122                         sta = sta_info_get_bss(sdata, mgmt->sa);
1123                         if (sta) {
1124                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1125                                                 IEEE80211_QOS_CTL_TID_MASK;
1126
1127                                 __ieee80211_stop_rx_ba_session(
1128                                         sta, tid, WLAN_BACK_RECIPIENT,
1129                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1130                                         true);
1131                         }
1132                         mutex_unlock(&local->sta_mtx);
1133                 } else switch (sdata->vif.type) {
1134                 case NL80211_IFTYPE_STATION:
1135                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1136                         break;
1137                 case NL80211_IFTYPE_ADHOC:
1138                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1139                         break;
1140                 case NL80211_IFTYPE_MESH_POINT:
1141                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1142                                 break;
1143                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1144                         break;
1145                 default:
1146                         WARN(1, "frame for unexpected interface type");
1147                         break;
1148                 }
1149
1150                 kfree_skb(skb);
1151         }
1152
1153         /* then other type-dependent work */
1154         switch (sdata->vif.type) {
1155         case NL80211_IFTYPE_STATION:
1156                 ieee80211_sta_work(sdata);
1157                 break;
1158         case NL80211_IFTYPE_ADHOC:
1159                 ieee80211_ibss_work(sdata);
1160                 break;
1161         case NL80211_IFTYPE_MESH_POINT:
1162                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1163                         break;
1164                 ieee80211_mesh_work(sdata);
1165                 break;
1166         default:
1167                 break;
1168         }
1169 }
1170
1171 static void ieee80211_recalc_smps_work(struct work_struct *work)
1172 {
1173         struct ieee80211_sub_if_data *sdata =
1174                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1175
1176         ieee80211_recalc_smps(sdata);
1177 }
1178
1179 /*
1180  * Helper function to initialise an interface to a specific type.
1181  */
1182 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1183                                   enum nl80211_iftype type)
1184 {
1185         /* clear type-dependent union */
1186         memset(&sdata->u, 0, sizeof(sdata->u));
1187
1188         /* and set some type-dependent values */
1189         sdata->vif.type = type;
1190         sdata->vif.p2p = false;
1191         sdata->wdev.iftype = type;
1192
1193         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1194         sdata->control_port_no_encrypt = false;
1195
1196         sdata->noack_map = 0;
1197
1198         /* only monitor/p2p-device differ */
1199         if (sdata->dev) {
1200                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1201                 sdata->dev->type = ARPHRD_ETHER;
1202         }
1203
1204         skb_queue_head_init(&sdata->skb_queue);
1205         INIT_WORK(&sdata->work, ieee80211_iface_work);
1206         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1207
1208         switch (type) {
1209         case NL80211_IFTYPE_P2P_GO:
1210                 type = NL80211_IFTYPE_AP;
1211                 sdata->vif.type = type;
1212                 sdata->vif.p2p = true;
1213                 /* fall through */
1214         case NL80211_IFTYPE_AP:
1215                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1216                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1217                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1218                 break;
1219         case NL80211_IFTYPE_P2P_CLIENT:
1220                 type = NL80211_IFTYPE_STATION;
1221                 sdata->vif.type = type;
1222                 sdata->vif.p2p = true;
1223                 /* fall through */
1224         case NL80211_IFTYPE_STATION:
1225                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1226                 ieee80211_sta_setup_sdata(sdata);
1227                 break;
1228         case NL80211_IFTYPE_ADHOC:
1229                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1230                 ieee80211_ibss_setup_sdata(sdata);
1231                 break;
1232         case NL80211_IFTYPE_MESH_POINT:
1233                 if (ieee80211_vif_is_mesh(&sdata->vif))
1234                         ieee80211_mesh_init_sdata(sdata);
1235                 break;
1236         case NL80211_IFTYPE_MONITOR:
1237                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1238                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1239                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1240                                       MONITOR_FLAG_OTHER_BSS;
1241                 break;
1242         case NL80211_IFTYPE_WDS:
1243                 sdata->vif.bss_conf.bssid = NULL;
1244                 break;
1245         case NL80211_IFTYPE_AP_VLAN:
1246                 break;
1247         case NL80211_IFTYPE_P2P_DEVICE:
1248                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1249                 break;
1250         case NL80211_IFTYPE_UNSPECIFIED:
1251         case NUM_NL80211_IFTYPES:
1252                 BUG();
1253                 break;
1254         }
1255
1256         ieee80211_debugfs_add_netdev(sdata);
1257 }
1258
1259 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1260                                            enum nl80211_iftype type)
1261 {
1262         struct ieee80211_local *local = sdata->local;
1263         int ret, err;
1264         enum nl80211_iftype internal_type = type;
1265         bool p2p = false;
1266
1267         ASSERT_RTNL();
1268
1269         if (!local->ops->change_interface)
1270                 return -EBUSY;
1271
1272         switch (sdata->vif.type) {
1273         case NL80211_IFTYPE_AP:
1274         case NL80211_IFTYPE_STATION:
1275         case NL80211_IFTYPE_ADHOC:
1276                 /*
1277                  * Could maybe also all others here?
1278                  * Just not sure how that interacts
1279                  * with the RX/config path e.g. for
1280                  * mesh.
1281                  */
1282                 break;
1283         default:
1284                 return -EBUSY;
1285         }
1286
1287         switch (type) {
1288         case NL80211_IFTYPE_AP:
1289         case NL80211_IFTYPE_STATION:
1290         case NL80211_IFTYPE_ADHOC:
1291                 /*
1292                  * Could probably support everything
1293                  * but WDS here (WDS do_open can fail
1294                  * under memory pressure, which this
1295                  * code isn't prepared to handle).
1296                  */
1297                 break;
1298         case NL80211_IFTYPE_P2P_CLIENT:
1299                 p2p = true;
1300                 internal_type = NL80211_IFTYPE_STATION;
1301                 break;
1302         case NL80211_IFTYPE_P2P_GO:
1303                 p2p = true;
1304                 internal_type = NL80211_IFTYPE_AP;
1305                 break;
1306         default:
1307                 return -EBUSY;
1308         }
1309
1310         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1311         if (ret)
1312                 return ret;
1313
1314         ieee80211_do_stop(sdata, false);
1315
1316         ieee80211_teardown_sdata(sdata);
1317
1318         ret = drv_change_interface(local, sdata, internal_type, p2p);
1319         if (ret)
1320                 type = sdata->vif.type;
1321
1322         /*
1323          * Ignore return value here, there's not much we can do since
1324          * the driver changed the interface type internally already.
1325          * The warnings will hopefully make driver authors fix it :-)
1326          */
1327         ieee80211_check_queues(sdata);
1328
1329         ieee80211_setup_sdata(sdata, type);
1330
1331         err = ieee80211_do_open(&sdata->wdev, false);
1332         WARN(err, "type change: do_open returned %d", err);
1333
1334         return ret;
1335 }
1336
1337 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1338                              enum nl80211_iftype type)
1339 {
1340         int ret;
1341
1342         ASSERT_RTNL();
1343
1344         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1345                 return 0;
1346
1347         if (ieee80211_sdata_running(sdata)) {
1348                 ret = ieee80211_runtime_change_iftype(sdata, type);
1349                 if (ret)
1350                         return ret;
1351         } else {
1352                 /* Purge and reset type-dependent state. */
1353                 ieee80211_teardown_sdata(sdata);
1354                 ieee80211_setup_sdata(sdata, type);
1355         }
1356
1357         /* reset some values that shouldn't be kept across type changes */
1358         sdata->drop_unencrypted = 0;
1359         if (type == NL80211_IFTYPE_STATION)
1360                 sdata->u.mgd.use_4addr = false;
1361
1362         return 0;
1363 }
1364
1365 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1366                                        u8 *perm_addr, enum nl80211_iftype type)
1367 {
1368         struct ieee80211_sub_if_data *sdata;
1369         u64 mask, start, addr, val, inc;
1370         u8 *m;
1371         u8 tmp_addr[ETH_ALEN];
1372         int i;
1373
1374         /* default ... something at least */
1375         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1376
1377         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1378             local->hw.wiphy->n_addresses <= 1)
1379                 return;
1380
1381         mutex_lock(&local->iflist_mtx);
1382
1383         switch (type) {
1384         case NL80211_IFTYPE_MONITOR:
1385                 /* doesn't matter */
1386                 break;
1387         case NL80211_IFTYPE_WDS:
1388         case NL80211_IFTYPE_AP_VLAN:
1389                 /* match up with an AP interface */
1390                 list_for_each_entry(sdata, &local->interfaces, list) {
1391                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1392                                 continue;
1393                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1394                         break;
1395                 }
1396                 /* keep default if no AP interface present */
1397                 break;
1398         case NL80211_IFTYPE_P2P_CLIENT:
1399         case NL80211_IFTYPE_P2P_GO:
1400                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1401                         list_for_each_entry(sdata, &local->interfaces, list) {
1402                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1403                                         continue;
1404                                 if (!ieee80211_sdata_running(sdata))
1405                                         continue;
1406                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1407                                 goto out_unlock;
1408                         }
1409                 }
1410                 /* otherwise fall through */
1411         default:
1412                 /* assign a new address if possible -- try n_addresses first */
1413                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1414                         bool used = false;
1415
1416                         list_for_each_entry(sdata, &local->interfaces, list) {
1417                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1418                                            sdata->vif.addr, ETH_ALEN) == 0) {
1419                                         used = true;
1420                                         break;
1421                                 }
1422                         }
1423
1424                         if (!used) {
1425                                 memcpy(perm_addr,
1426                                        local->hw.wiphy->addresses[i].addr,
1427                                        ETH_ALEN);
1428                                 break;
1429                         }
1430                 }
1431
1432                 /* try mask if available */
1433                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1434                         break;
1435
1436                 m = local->hw.wiphy->addr_mask;
1437                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1438                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1439                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1440
1441                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1442                         /* not a contiguous mask ... not handled now! */
1443                         pr_info("not contiguous\n");
1444                         break;
1445                 }
1446
1447                 m = local->hw.wiphy->perm_addr;
1448                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1449                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1450                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1451
1452                 inc = 1ULL<<__ffs64(mask);
1453                 val = (start & mask);
1454                 addr = (start & ~mask) | (val & mask);
1455                 do {
1456                         bool used = false;
1457
1458                         tmp_addr[5] = addr >> 0*8;
1459                         tmp_addr[4] = addr >> 1*8;
1460                         tmp_addr[3] = addr >> 2*8;
1461                         tmp_addr[2] = addr >> 3*8;
1462                         tmp_addr[1] = addr >> 4*8;
1463                         tmp_addr[0] = addr >> 5*8;
1464
1465                         val += inc;
1466
1467                         list_for_each_entry(sdata, &local->interfaces, list) {
1468                                 if (memcmp(tmp_addr, sdata->vif.addr,
1469                                                         ETH_ALEN) == 0) {
1470                                         used = true;
1471                                         break;
1472                                 }
1473                         }
1474
1475                         if (!used) {
1476                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1477                                 break;
1478                         }
1479                         addr = (start & ~mask) | (val & mask);
1480                 } while (addr != start);
1481
1482                 break;
1483         }
1484
1485  out_unlock:
1486         mutex_unlock(&local->iflist_mtx);
1487 }
1488
1489 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1490 {
1491         struct ieee80211_sub_if_data *sdata;
1492
1493         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1494
1495         ieee80211_cleanup_sdata_stas(sdata);
1496 }
1497
1498 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1499                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1500                      struct vif_params *params)
1501 {
1502         struct net_device *ndev = NULL;
1503         struct ieee80211_sub_if_data *sdata = NULL;
1504         int ret, i;
1505         int txqs = 1;
1506
1507         ASSERT_RTNL();
1508
1509         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1510                 struct wireless_dev *wdev;
1511
1512                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1513                                 GFP_KERNEL);
1514                 if (!sdata)
1515                         return -ENOMEM;
1516                 wdev = &sdata->wdev;
1517
1518                 sdata->dev = NULL;
1519                 strlcpy(sdata->name, name, IFNAMSIZ);
1520                 ieee80211_assign_perm_addr(local, wdev->address, type);
1521                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1522         } else {
1523                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1524                         txqs = IEEE80211_NUM_ACS;
1525
1526                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1527                                         local->hw.vif_data_size,
1528                                         name, ieee80211_if_setup, txqs, 1);
1529                 if (!ndev)
1530                         return -ENOMEM;
1531                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1532
1533                 ndev->needed_headroom = local->tx_headroom +
1534                                         4*6 /* four MAC addresses */
1535                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1536                                         + 6 /* mesh */
1537                                         + 8 /* rfc1042/bridge tunnel */
1538                                         - ETH_HLEN /* ethernet hard_header_len */
1539                                         + IEEE80211_ENCRYPT_HEADROOM;
1540                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1541
1542                 ret = dev_alloc_name(ndev, ndev->name);
1543                 if (ret < 0) {
1544                         free_netdev(ndev);
1545                         return ret;
1546                 }
1547
1548                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1549                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1550                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1551
1552                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1553                 sdata = netdev_priv(ndev);
1554                 ndev->ieee80211_ptr = &sdata->wdev;
1555                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1556                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1557
1558                 sdata->dev = ndev;
1559         }
1560
1561         /* initialise type-independent data */
1562         sdata->wdev.wiphy = local->hw.wiphy;
1563         sdata->local = local;
1564
1565         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1566                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1567
1568         INIT_LIST_HEAD(&sdata->key_list);
1569
1570         spin_lock_init(&sdata->cleanup_stations_lock);
1571         INIT_LIST_HEAD(&sdata->cleanup_stations);
1572         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1573         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1574                           ieee80211_dfs_cac_timer_work);
1575         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1576                           ieee80211_delayed_tailroom_dec);
1577
1578         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1579                 struct ieee80211_supported_band *sband;
1580                 sband = local->hw.wiphy->bands[i];
1581                 sdata->rc_rateidx_mask[i] =
1582                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1583                 if (sband)
1584                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1585                                sband->ht_cap.mcs.rx_mask,
1586                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1587                 else
1588                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1589                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1590         }
1591
1592         ieee80211_set_default_queues(sdata);
1593
1594         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1595         sdata->user_power_level = local->user_power_level;
1596
1597         /* setup type-dependent data */
1598         ieee80211_setup_sdata(sdata, type);
1599
1600         if (ndev) {
1601                 if (params) {
1602                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1603                         if (type == NL80211_IFTYPE_STATION)
1604                                 sdata->u.mgd.use_4addr = params->use_4addr;
1605                 }
1606
1607                 ndev->features |= local->hw.netdev_features;
1608
1609                 ret = register_netdevice(ndev);
1610                 if (ret) {
1611                         free_netdev(ndev);
1612                         return ret;
1613                 }
1614         }
1615
1616         mutex_lock(&local->iflist_mtx);
1617         list_add_tail_rcu(&sdata->list, &local->interfaces);
1618         mutex_unlock(&local->iflist_mtx);
1619
1620         if (new_wdev)
1621                 *new_wdev = &sdata->wdev;
1622
1623         return 0;
1624 }
1625
1626 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1627 {
1628         ASSERT_RTNL();
1629
1630         mutex_lock(&sdata->local->iflist_mtx);
1631         list_del_rcu(&sdata->list);
1632         mutex_unlock(&sdata->local->iflist_mtx);
1633
1634         synchronize_rcu();
1635
1636         if (sdata->dev) {
1637                 unregister_netdevice(sdata->dev);
1638         } else {
1639                 cfg80211_unregister_wdev(&sdata->wdev);
1640                 kfree(sdata);
1641         }
1642 }
1643
1644 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1645 {
1646         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1647                 return;
1648         ieee80211_do_stop(sdata, true);
1649         ieee80211_teardown_sdata(sdata);
1650 }
1651
1652 /*
1653  * Remove all interfaces, may only be called at hardware unregistration
1654  * time because it doesn't do RCU-safe list removals.
1655  */
1656 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1657 {
1658         struct ieee80211_sub_if_data *sdata, *tmp;
1659         LIST_HEAD(unreg_list);
1660         LIST_HEAD(wdev_list);
1661
1662         ASSERT_RTNL();
1663
1664         mutex_lock(&local->iflist_mtx);
1665         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1666                 list_del(&sdata->list);
1667
1668                 if (sdata->dev)
1669                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1670                 else
1671                         list_add(&sdata->list, &wdev_list);
1672         }
1673         mutex_unlock(&local->iflist_mtx);
1674         unregister_netdevice_many(&unreg_list);
1675         list_del(&unreg_list);
1676
1677         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1678                 list_del(&sdata->list);
1679                 cfg80211_unregister_wdev(&sdata->wdev);
1680                 kfree(sdata);
1681         }
1682 }
1683
1684 static int netdev_notify(struct notifier_block *nb,
1685                          unsigned long state,
1686                          void *ndev)
1687 {
1688         struct net_device *dev = ndev;
1689         struct ieee80211_sub_if_data *sdata;
1690
1691         if (state != NETDEV_CHANGENAME)
1692                 return 0;
1693
1694         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1695                 return 0;
1696
1697         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1698                 return 0;
1699
1700         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1701
1702         memcpy(sdata->name, dev->name, IFNAMSIZ);
1703
1704         ieee80211_debugfs_rename_netdev(sdata);
1705         return 0;
1706 }
1707
1708 static struct notifier_block mac80211_netdev_notifier = {
1709         .notifier_call = netdev_notify,
1710 };
1711
1712 int ieee80211_iface_init(void)
1713 {
1714         return register_netdevice_notifier(&mac80211_netdev_notifier);
1715 }
1716
1717 void ieee80211_iface_exit(void)
1718 {
1719         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1720 }