640afab304d7a02e50414a16f3df8e22c6ea4c30
[linux-3.10.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling (except master interface)
3  *
4  * Copyright 2002-2005, Instant802 Networks, Inc.
5  * Copyright 2005-2006, Devicescape Software, Inc.
6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30  * DOC: Interface list locking
31  *
32  * The interface list in each struct ieee80211_local is protected
33  * three-fold:
34  *
35  * (1) modifications may only be done under the RTNL
36  * (2) modifications and readers are protected against each other by
37  *     the iflist_mtx.
38  * (3) modifications are done in an RCU manner so atomic readers
39  *     can traverse the list in RCU-safe blocks.
40  *
41  * As a consequence, reads (traversals) of the list can be protected
42  * by either the RTNL, the iflist_mtx or RCU.
43  */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47         struct ieee80211_chanctx_conf *chanctx_conf;
48         int power;
49
50         rcu_read_lock();
51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52         if (!chanctx_conf) {
53                 rcu_read_unlock();
54                 return false;
55         }
56
57         power = chanctx_conf->def.chan->max_power;
58         rcu_read_unlock();
59
60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61                 power = min(power, sdata->user_power_level);
62
63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64                 power = min(power, sdata->ap_power_level);
65
66         if (power != sdata->vif.bss_conf.txpower) {
67                 sdata->vif.bss_conf.txpower = power;
68                 ieee80211_hw_config(sdata->local, 0);
69                 return true;
70         }
71
72         return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77         if (__ieee80211_recalc_txpower(sdata))
78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 ieee80211_idle_off(struct ieee80211_local *local)
82 {
83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84                 return 0;
85
86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87         return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 ieee80211_idle_on(struct ieee80211_local *local)
91 {
92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93                 return 0;
94
95         drv_flush(local, false);
96
97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98         return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 void ieee80211_recalc_idle(struct ieee80211_local *local)
102 {
103         bool working = false, scanning, active;
104         unsigned int led_trig_start = 0, led_trig_stop = 0;
105         struct ieee80211_roc_work *roc;
106         u32 change;
107
108         lockdep_assert_held(&local->mtx);
109
110         active = !list_empty(&local->chanctx_list) || local->monitors;
111
112         if (!local->ops->remain_on_channel) {
113                 list_for_each_entry(roc, &local->roc_list, list) {
114                         working = true;
115                         break;
116                 }
117         }
118
119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121
122         if (working || scanning)
123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124         else
125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126
127         if (active)
128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129         else
130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131
132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133
134         if (working || scanning || active)
135                 change = ieee80211_idle_off(local);
136         else
137                 change = ieee80211_idle_on(local);
138         if (change)
139                 ieee80211_hw_config(local, change);
140 }
141
142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
143 {
144         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
145                 return -EINVAL;
146
147         dev->mtu = new_mtu;
148         return 0;
149 }
150
151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
152 {
153         struct ieee80211_sub_if_data *sdata;
154         u64 new, mask, tmp;
155         u8 *m;
156         int ret = 0;
157
158         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
159                 return 0;
160
161         m = addr;
162         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
163                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
164                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
165
166         m = local->hw.wiphy->addr_mask;
167         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171
172         mutex_lock(&local->iflist_mtx);
173         list_for_each_entry(sdata, &local->interfaces, list) {
174                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
175                         continue;
176
177                 m = sdata->vif.addr;
178                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181
182                 if ((new & ~mask) != (tmp & ~mask)) {
183                         ret = -EINVAL;
184                         break;
185                 }
186         }
187         mutex_unlock(&local->iflist_mtx);
188
189         return ret;
190 }
191
192 static int ieee80211_change_mac(struct net_device *dev, void *addr)
193 {
194         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
195         struct sockaddr *sa = addr;
196         int ret;
197
198         if (ieee80211_sdata_running(sdata))
199                 return -EBUSY;
200
201         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
202         if (ret)
203                 return ret;
204
205         ret = eth_mac_addr(dev, sa);
206
207         if (ret == 0)
208                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
209
210         return ret;
211 }
212
213 static inline int identical_mac_addr_allowed(int type1, int type2)
214 {
215         return type1 == NL80211_IFTYPE_MONITOR ||
216                 type2 == NL80211_IFTYPE_MONITOR ||
217                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
218                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
219                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
220                 (type1 == NL80211_IFTYPE_WDS &&
221                         (type2 == NL80211_IFTYPE_WDS ||
222                          type2 == NL80211_IFTYPE_AP)) ||
223                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
224                 (type1 == NL80211_IFTYPE_AP_VLAN &&
225                         (type2 == NL80211_IFTYPE_AP ||
226                          type2 == NL80211_IFTYPE_AP_VLAN));
227 }
228
229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
230                                             enum nl80211_iftype iftype)
231 {
232         struct ieee80211_local *local = sdata->local;
233         struct ieee80211_sub_if_data *nsdata;
234
235         ASSERT_RTNL();
236
237         /* we hold the RTNL here so can safely walk the list */
238         list_for_each_entry(nsdata, &local->interfaces, list) {
239                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
240                         /*
241                          * Allow only a single IBSS interface to be up at any
242                          * time. This is restricted because beacon distribution
243                          * cannot work properly if both are in the same IBSS.
244                          *
245                          * To remove this restriction we'd have to disallow them
246                          * from setting the same SSID on different IBSS interfaces
247                          * belonging to the same hardware. Then, however, we're
248                          * faced with having to adopt two different TSF timers...
249                          */
250                         if (iftype == NL80211_IFTYPE_ADHOC &&
251                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
252                                 return -EBUSY;
253
254                         /*
255                          * The remaining checks are only performed for interfaces
256                          * with the same MAC address.
257                          */
258                         if (!ether_addr_equal(sdata->vif.addr,
259                                               nsdata->vif.addr))
260                                 continue;
261
262                         /*
263                          * check whether it may have the same address
264                          */
265                         if (!identical_mac_addr_allowed(iftype,
266                                                         nsdata->vif.type))
267                                 return -ENOTUNIQ;
268
269                         /*
270                          * can only add VLANs to enabled APs
271                          */
272                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
273                             nsdata->vif.type == NL80211_IFTYPE_AP)
274                                 sdata->bss = &nsdata->u.ap;
275                 }
276         }
277
278         return 0;
279 }
280
281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
282 {
283         int n_queues = sdata->local->hw.queues;
284         int i;
285
286         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
287                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
288                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
289                                          IEEE80211_INVAL_HW_QUEUE))
290                                 return -EINVAL;
291                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
292                                          n_queues))
293                                 return -EINVAL;
294                 }
295         }
296
297         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
298              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
299             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
300                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
301                 return 0;
302         }
303
304         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
305                 return -EINVAL;
306
307         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
308                 return -EINVAL;
309
310         return 0;
311 }
312
313 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
314                                     const int offset)
315 {
316         struct ieee80211_local *local = sdata->local;
317         u32 flags = sdata->u.mntr_flags;
318
319 #define ADJUST(_f, _s)  do {                                    \
320         if (flags & MONITOR_FLAG_##_f)                          \
321                 local->fif_##_s += offset;                      \
322         } while (0)
323
324         ADJUST(FCSFAIL, fcsfail);
325         ADJUST(PLCPFAIL, plcpfail);
326         ADJUST(CONTROL, control);
327         ADJUST(CONTROL, pspoll);
328         ADJUST(OTHER_BSS, other_bss);
329
330 #undef ADJUST
331 }
332
333 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
334 {
335         struct ieee80211_local *local = sdata->local;
336         int i;
337
338         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
339                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
340                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
341                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
342                         sdata->vif.hw_queue[i] = i;
343                 else
344                         sdata->vif.hw_queue[i] = 0;
345         }
346         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
347 }
348
349 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
350 {
351         struct ieee80211_sub_if_data *sdata;
352         int ret = 0;
353
354         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
355                 return 0;
356
357         mutex_lock(&local->iflist_mtx);
358
359         if (local->monitor_sdata)
360                 goto out_unlock;
361
362         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
363         if (!sdata) {
364                 ret = -ENOMEM;
365                 goto out_unlock;
366         }
367
368         /* set up data */
369         sdata->local = local;
370         sdata->vif.type = NL80211_IFTYPE_MONITOR;
371         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
372                  wiphy_name(local->hw.wiphy));
373
374         ieee80211_set_default_queues(sdata);
375
376         ret = drv_add_interface(local, sdata);
377         if (WARN_ON(ret)) {
378                 /* ok .. stupid driver, it asked for this! */
379                 kfree(sdata);
380                 goto out_unlock;
381         }
382
383         ret = ieee80211_check_queues(sdata);
384         if (ret) {
385                 kfree(sdata);
386                 goto out_unlock;
387         }
388
389         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
390                                         IEEE80211_CHANCTX_EXCLUSIVE);
391         if (ret) {
392                 drv_remove_interface(local, sdata);
393                 kfree(sdata);
394                 goto out_unlock;
395         }
396
397         rcu_assign_pointer(local->monitor_sdata, sdata);
398  out_unlock:
399         mutex_unlock(&local->iflist_mtx);
400         return ret;
401 }
402
403 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
404 {
405         struct ieee80211_sub_if_data *sdata;
406
407         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
408                 return;
409
410         mutex_lock(&local->iflist_mtx);
411
412         sdata = rcu_dereference_protected(local->monitor_sdata,
413                                           lockdep_is_held(&local->iflist_mtx));
414         if (!sdata)
415                 goto out_unlock;
416
417         rcu_assign_pointer(local->monitor_sdata, NULL);
418         synchronize_net();
419
420         ieee80211_vif_release_channel(sdata);
421
422         drv_remove_interface(local, sdata);
423
424         kfree(sdata);
425  out_unlock:
426         mutex_unlock(&local->iflist_mtx);
427 }
428
429 /*
430  * NOTE: Be very careful when changing this function, it must NOT return
431  * an error on interface type changes that have been pre-checked, so most
432  * checks should be in ieee80211_check_concurrent_iface.
433  */
434 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
435 {
436         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
437         struct net_device *dev = wdev->netdev;
438         struct ieee80211_local *local = sdata->local;
439         struct sta_info *sta;
440         u32 changed = 0;
441         int res;
442         u32 hw_reconf_flags = 0;
443
444         switch (sdata->vif.type) {
445         case NL80211_IFTYPE_WDS:
446                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
447                         return -ENOLINK;
448                 break;
449         case NL80211_IFTYPE_AP_VLAN: {
450                 struct ieee80211_sub_if_data *master;
451
452                 if (!sdata->bss)
453                         return -ENOLINK;
454
455                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
456
457                 master = container_of(sdata->bss,
458                                       struct ieee80211_sub_if_data, u.ap);
459                 sdata->control_port_protocol =
460                         master->control_port_protocol;
461                 sdata->control_port_no_encrypt =
462                         master->control_port_no_encrypt;
463                 break;
464                 }
465         case NL80211_IFTYPE_AP:
466                 sdata->bss = &sdata->u.ap;
467                 break;
468         case NL80211_IFTYPE_MESH_POINT:
469         case NL80211_IFTYPE_STATION:
470         case NL80211_IFTYPE_MONITOR:
471         case NL80211_IFTYPE_ADHOC:
472         case NL80211_IFTYPE_P2P_DEVICE:
473                 /* no special treatment */
474                 break;
475         case NL80211_IFTYPE_UNSPECIFIED:
476         case NUM_NL80211_IFTYPES:
477         case NL80211_IFTYPE_P2P_CLIENT:
478         case NL80211_IFTYPE_P2P_GO:
479                 /* cannot happen */
480                 WARN_ON(1);
481                 break;
482         }
483
484         if (local->open_count == 0) {
485                 res = drv_start(local);
486                 if (res)
487                         goto err_del_bss;
488                 if (local->ops->napi_poll)
489                         napi_enable(&local->napi);
490                 /* we're brought up, everything changes */
491                 hw_reconf_flags = ~0;
492                 ieee80211_led_radio(local, true);
493                 ieee80211_mod_tpt_led_trig(local,
494                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
495         }
496
497         /*
498          * Copy the hopefully now-present MAC address to
499          * this interface, if it has the special null one.
500          */
501         if (dev && is_zero_ether_addr(dev->dev_addr)) {
502                 memcpy(dev->dev_addr,
503                        local->hw.wiphy->perm_addr,
504                        ETH_ALEN);
505                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
506
507                 if (!is_valid_ether_addr(dev->dev_addr)) {
508                         res = -EADDRNOTAVAIL;
509                         goto err_stop;
510                 }
511         }
512
513         switch (sdata->vif.type) {
514         case NL80211_IFTYPE_AP_VLAN:
515                 /* no need to tell driver, but set carrier and chanctx */
516                 if (rtnl_dereference(sdata->bss->beacon)) {
517                         ieee80211_vif_vlan_copy_chanctx(sdata);
518                         netif_carrier_on(dev);
519                 } else {
520                         netif_carrier_off(dev);
521                 }
522                 break;
523         case NL80211_IFTYPE_MONITOR:
524                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
525                         local->cooked_mntrs++;
526                         break;
527                 }
528
529                 if (local->monitors == 0 && local->open_count == 0) {
530                         res = ieee80211_add_virtual_monitor(local);
531                         if (res)
532                                 goto err_stop;
533                 }
534
535                 /* must be before the call to ieee80211_configure_filter */
536                 local->monitors++;
537                 if (local->monitors == 1) {
538                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
539                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
540                 }
541
542                 ieee80211_adjust_monitor_flags(sdata, 1);
543                 ieee80211_configure_filter(local);
544
545                 netif_carrier_on(dev);
546                 break;
547         default:
548                 if (coming_up) {
549                         ieee80211_del_virtual_monitor(local);
550
551                         res = drv_add_interface(local, sdata);
552                         if (res)
553                                 goto err_stop;
554                         res = ieee80211_check_queues(sdata);
555                         if (res)
556                                 goto err_del_interface;
557                 }
558
559                 drv_add_interface_debugfs(local, sdata);
560
561                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
562                         local->fif_pspoll++;
563                         local->fif_probe_req++;
564
565                         ieee80211_configure_filter(local);
566                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
567                         local->fif_probe_req++;
568                 }
569
570                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
571                         changed |= ieee80211_reset_erp_info(sdata);
572                 ieee80211_bss_info_change_notify(sdata, changed);
573
574                 switch (sdata->vif.type) {
575                 case NL80211_IFTYPE_STATION:
576                 case NL80211_IFTYPE_ADHOC:
577                 case NL80211_IFTYPE_AP:
578                 case NL80211_IFTYPE_MESH_POINT:
579                         netif_carrier_off(dev);
580                         break;
581                 case NL80211_IFTYPE_WDS:
582                 case NL80211_IFTYPE_P2P_DEVICE:
583                         break;
584                 default:
585                         netif_carrier_on(dev);
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(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         /*
723          * Don't count this interface for promisc/allmulti while it
724          * is down. dev_mc_unsync() will invoke set_multicast_list
725          * on the master interface which will sync these down to the
726          * hardware as filter flags.
727          */
728         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
729                 atomic_dec(&local->iff_allmultis);
730
731         if (sdata->flags & IEEE80211_SDATA_PROMISC)
732                 atomic_dec(&local->iff_promiscs);
733
734         if (sdata->vif.type == NL80211_IFTYPE_AP) {
735                 local->fif_pspoll--;
736                 local->fif_probe_req--;
737         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
738                 local->fif_probe_req--;
739         }
740
741         if (sdata->dev) {
742                 netif_addr_lock_bh(sdata->dev);
743                 spin_lock_bh(&local->filter_lock);
744                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
745                                  sdata->dev->addr_len);
746                 spin_unlock_bh(&local->filter_lock);
747                 netif_addr_unlock_bh(sdata->dev);
748
749                 ieee80211_configure_filter(local);
750         }
751
752         del_timer_sync(&local->dynamic_ps_timer);
753         cancel_work_sync(&local->dynamic_ps_enable_work);
754
755         cancel_work_sync(&sdata->recalc_smps);
756
757         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
758
759         if (sdata->wdev.cac_started) {
760                 mutex_lock(&local->iflist_mtx);
761                 ieee80211_vif_release_channel(sdata);
762                 mutex_unlock(&local->iflist_mtx);
763                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
764                                    GFP_KERNEL);
765         }
766
767         /* APs need special treatment */
768         if (sdata->vif.type == NL80211_IFTYPE_AP) {
769                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
770
771                 /* down all dependent devices, that is VLANs */
772                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
773                                          u.vlan.list)
774                         dev_close(vlan->dev);
775                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
776         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
777                 /* remove all packets in parent bc_buf pointing to this dev */
778                 ps = &sdata->bss->ps;
779
780                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
781                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
782                         if (skb->dev == sdata->dev) {
783                                 __skb_unlink(skb, &ps->bc_buf);
784                                 local->total_ps_buffered--;
785                                 ieee80211_free_txskb(&local->hw, skb);
786                         }
787                 }
788                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
789         }
790
791         if (going_down)
792                 local->open_count--;
793
794         switch (sdata->vif.type) {
795         case NL80211_IFTYPE_AP_VLAN:
796                 list_del(&sdata->u.vlan.list);
797                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
798                 /* no need to tell driver */
799                 break;
800         case NL80211_IFTYPE_MONITOR:
801                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
802                         local->cooked_mntrs--;
803                         break;
804                 }
805
806                 local->monitors--;
807                 if (local->monitors == 0) {
808                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
809                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
810                         ieee80211_del_virtual_monitor(local);
811                 }
812
813                 ieee80211_adjust_monitor_flags(sdata, -1);
814                 ieee80211_configure_filter(local);
815                 break;
816         case NL80211_IFTYPE_P2P_DEVICE:
817                 /* relies on synchronize_rcu() below */
818                 rcu_assign_pointer(local->p2p_sdata, NULL);
819                 /* fall through */
820         default:
821                 cancel_work_sync(&sdata->work);
822                 /*
823                  * When we get here, the interface is marked down.
824                  *
825                  * sta_info_flush_cleanup() requires rcu_barrier()
826                  * first to wait for the station call_rcu() calls
827                  * to complete, here we need at least sychronize_rcu()
828                  * it to wait for the RX path in case it is using the
829                  * interface and enqueuing frames at this very time on
830                  * another CPU.
831                  */
832                 rcu_barrier();
833                 sta_info_flush_cleanup(sdata);
834
835                 skb_queue_purge(&sdata->skb_queue);
836
837                 /*
838                  * Free all remaining keys, there shouldn't be any,
839                  * except maybe group keys in AP more or WDS?
840                  */
841                 ieee80211_free_keys(sdata);
842
843                 drv_remove_interface_debugfs(local, sdata);
844
845                 if (going_down)
846                         drv_remove_interface(local, sdata);
847         }
848
849         sdata->bss = NULL;
850
851         ieee80211_recalc_ps(local, -1);
852
853         if (local->open_count == 0) {
854                 if (local->ops->napi_poll)
855                         napi_disable(&local->napi);
856                 ieee80211_clear_tx_pending(local);
857                 ieee80211_stop_device(local);
858
859                 /* no reconfiguring after stop! */
860                 hw_reconf_flags = 0;
861         }
862
863         /* do after stop to avoid reconfiguring when we stop anyway */
864         if (hw_reconf_flags)
865                 ieee80211_hw_config(local, hw_reconf_flags);
866
867         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
868         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
869                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
870                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
871                         if (info->control.vif == &sdata->vif) {
872                                 __skb_unlink(skb, &local->pending[i]);
873                                 ieee80211_free_txskb(&local->hw, skb);
874                         }
875                 }
876         }
877         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
878
879         if (local->monitors == local->open_count && local->monitors > 0)
880                 ieee80211_add_virtual_monitor(local);
881 }
882
883 static int ieee80211_stop(struct net_device *dev)
884 {
885         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
886
887         ieee80211_do_stop(sdata, true);
888
889         return 0;
890 }
891
892 static void ieee80211_set_multicast_list(struct net_device *dev)
893 {
894         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
895         struct ieee80211_local *local = sdata->local;
896         int allmulti, promisc, sdata_allmulti, sdata_promisc;
897
898         allmulti = !!(dev->flags & IFF_ALLMULTI);
899         promisc = !!(dev->flags & IFF_PROMISC);
900         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
901         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
902
903         if (allmulti != sdata_allmulti) {
904                 if (dev->flags & IFF_ALLMULTI)
905                         atomic_inc(&local->iff_allmultis);
906                 else
907                         atomic_dec(&local->iff_allmultis);
908                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
909         }
910
911         if (promisc != sdata_promisc) {
912                 if (dev->flags & IFF_PROMISC)
913                         atomic_inc(&local->iff_promiscs);
914                 else
915                         atomic_dec(&local->iff_promiscs);
916                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
917         }
918         spin_lock_bh(&local->filter_lock);
919         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
920         spin_unlock_bh(&local->filter_lock);
921         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
922 }
923
924 /*
925  * Called when the netdev is removed or, by the code below, before
926  * the interface type changes.
927  */
928 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
929 {
930         int flushed;
931         int i;
932
933         /* free extra data */
934         ieee80211_free_keys(sdata);
935
936         ieee80211_debugfs_remove_netdev(sdata);
937
938         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
939                 __skb_queue_purge(&sdata->fragments[i].skb_list);
940         sdata->fragment_next = 0;
941
942         if (ieee80211_vif_is_mesh(&sdata->vif))
943                 mesh_rmc_free(sdata);
944
945         flushed = sta_info_flush(sdata);
946         WARN_ON(flushed);
947 }
948
949 static void ieee80211_uninit(struct net_device *dev)
950 {
951         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
952 }
953
954 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
955                                          struct sk_buff *skb)
956 {
957         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
958 }
959
960 static const struct net_device_ops ieee80211_dataif_ops = {
961         .ndo_open               = ieee80211_open,
962         .ndo_stop               = ieee80211_stop,
963         .ndo_uninit             = ieee80211_uninit,
964         .ndo_start_xmit         = ieee80211_subif_start_xmit,
965         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
966         .ndo_change_mtu         = ieee80211_change_mtu,
967         .ndo_set_mac_address    = ieee80211_change_mac,
968         .ndo_select_queue       = ieee80211_netdev_select_queue,
969 };
970
971 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
972                                           struct sk_buff *skb)
973 {
974         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
975         struct ieee80211_local *local = sdata->local;
976         struct ieee80211_hdr *hdr;
977         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
978
979         if (local->hw.queues < IEEE80211_NUM_ACS)
980                 return 0;
981
982         if (skb->len < 4 ||
983             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
984                 return 0; /* doesn't matter, frame will be dropped */
985
986         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
987
988         return ieee80211_select_queue_80211(sdata, skb, hdr);
989 }
990
991 static const struct net_device_ops ieee80211_monitorif_ops = {
992         .ndo_open               = ieee80211_open,
993         .ndo_stop               = ieee80211_stop,
994         .ndo_uninit             = ieee80211_uninit,
995         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
996         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
997         .ndo_change_mtu         = ieee80211_change_mtu,
998         .ndo_set_mac_address    = eth_mac_addr,
999         .ndo_select_queue       = ieee80211_monitor_select_queue,
1000 };
1001
1002 static void ieee80211_if_setup(struct net_device *dev)
1003 {
1004         ether_setup(dev);
1005         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1006         dev->netdev_ops = &ieee80211_dataif_ops;
1007         dev->destructor = free_netdev;
1008 }
1009
1010 static void ieee80211_iface_work(struct work_struct *work)
1011 {
1012         struct ieee80211_sub_if_data *sdata =
1013                 container_of(work, struct ieee80211_sub_if_data, work);
1014         struct ieee80211_local *local = sdata->local;
1015         struct sk_buff *skb;
1016         struct sta_info *sta;
1017         struct ieee80211_ra_tid *ra_tid;
1018
1019         if (!ieee80211_sdata_running(sdata))
1020                 return;
1021
1022         if (local->scanning)
1023                 return;
1024
1025         /*
1026          * ieee80211_queue_work() should have picked up most cases,
1027          * here we'll pick the rest.
1028          */
1029         if (WARN(local->suspended,
1030                  "interface work scheduled while going to suspend\n"))
1031                 return;
1032
1033         /* first process frames */
1034         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1035                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1036
1037                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1038                         ra_tid = (void *)&skb->cb;
1039                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1040                                                  ra_tid->tid);
1041                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1042                         ra_tid = (void *)&skb->cb;
1043                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1044                                                 ra_tid->tid);
1045                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1046                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1047                         int len = skb->len;
1048
1049                         mutex_lock(&local->sta_mtx);
1050                         sta = sta_info_get_bss(sdata, mgmt->sa);
1051                         if (sta) {
1052                                 switch (mgmt->u.action.u.addba_req.action_code) {
1053                                 case WLAN_ACTION_ADDBA_REQ:
1054                                         ieee80211_process_addba_request(
1055                                                         local, sta, mgmt, len);
1056                                         break;
1057                                 case WLAN_ACTION_ADDBA_RESP:
1058                                         ieee80211_process_addba_resp(local, sta,
1059                                                                      mgmt, len);
1060                                         break;
1061                                 case WLAN_ACTION_DELBA:
1062                                         ieee80211_process_delba(sdata, sta,
1063                                                                 mgmt, len);
1064                                         break;
1065                                 default:
1066                                         WARN_ON(1);
1067                                         break;
1068                                 }
1069                         }
1070                         mutex_unlock(&local->sta_mtx);
1071                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1072                         struct ieee80211_hdr *hdr = (void *)mgmt;
1073                         /*
1074                          * So the frame isn't mgmt, but frame_control
1075                          * is at the right place anyway, of course, so
1076                          * the if statement is correct.
1077                          *
1078                          * Warn if we have other data frame types here,
1079                          * they must not get here.
1080                          */
1081                         WARN_ON(hdr->frame_control &
1082                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1083                         WARN_ON(!(hdr->seq_ctrl &
1084                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1085                         /*
1086                          * This was a fragment of a frame, received while
1087                          * a block-ack session was active. That cannot be
1088                          * right, so terminate the session.
1089                          */
1090                         mutex_lock(&local->sta_mtx);
1091                         sta = sta_info_get_bss(sdata, mgmt->sa);
1092                         if (sta) {
1093                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1094                                                 IEEE80211_QOS_CTL_TID_MASK;
1095
1096                                 __ieee80211_stop_rx_ba_session(
1097                                         sta, tid, WLAN_BACK_RECIPIENT,
1098                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1099                                         true);
1100                         }
1101                         mutex_unlock(&local->sta_mtx);
1102                 } else switch (sdata->vif.type) {
1103                 case NL80211_IFTYPE_STATION:
1104                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1105                         break;
1106                 case NL80211_IFTYPE_ADHOC:
1107                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1108                         break;
1109                 case NL80211_IFTYPE_MESH_POINT:
1110                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1111                                 break;
1112                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1113                         break;
1114                 default:
1115                         WARN(1, "frame for unexpected interface type");
1116                         break;
1117                 }
1118
1119                 kfree_skb(skb);
1120         }
1121
1122         /* then other type-dependent work */
1123         switch (sdata->vif.type) {
1124         case NL80211_IFTYPE_STATION:
1125                 ieee80211_sta_work(sdata);
1126                 break;
1127         case NL80211_IFTYPE_ADHOC:
1128                 ieee80211_ibss_work(sdata);
1129                 break;
1130         case NL80211_IFTYPE_MESH_POINT:
1131                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1132                         break;
1133                 ieee80211_mesh_work(sdata);
1134                 break;
1135         default:
1136                 break;
1137         }
1138 }
1139
1140 static void ieee80211_recalc_smps_work(struct work_struct *work)
1141 {
1142         struct ieee80211_sub_if_data *sdata =
1143                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1144
1145         ieee80211_recalc_smps(sdata);
1146 }
1147
1148 /*
1149  * Helper function to initialise an interface to a specific type.
1150  */
1151 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1152                                   enum nl80211_iftype type)
1153 {
1154         /* clear type-dependent union */
1155         memset(&sdata->u, 0, sizeof(sdata->u));
1156
1157         /* and set some type-dependent values */
1158         sdata->vif.type = type;
1159         sdata->vif.p2p = false;
1160         sdata->wdev.iftype = type;
1161
1162         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1163         sdata->control_port_no_encrypt = false;
1164
1165         sdata->noack_map = 0;
1166
1167         /* only monitor/p2p-device differ */
1168         if (sdata->dev) {
1169                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1170                 sdata->dev->type = ARPHRD_ETHER;
1171         }
1172
1173         skb_queue_head_init(&sdata->skb_queue);
1174         INIT_WORK(&sdata->work, ieee80211_iface_work);
1175         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1176
1177         switch (type) {
1178         case NL80211_IFTYPE_P2P_GO:
1179                 type = NL80211_IFTYPE_AP;
1180                 sdata->vif.type = type;
1181                 sdata->vif.p2p = true;
1182                 /* fall through */
1183         case NL80211_IFTYPE_AP:
1184                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1185                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1186                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1187                 break;
1188         case NL80211_IFTYPE_P2P_CLIENT:
1189                 type = NL80211_IFTYPE_STATION;
1190                 sdata->vif.type = type;
1191                 sdata->vif.p2p = true;
1192                 /* fall through */
1193         case NL80211_IFTYPE_STATION:
1194                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1195                 ieee80211_sta_setup_sdata(sdata);
1196                 break;
1197         case NL80211_IFTYPE_ADHOC:
1198                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1199                 ieee80211_ibss_setup_sdata(sdata);
1200                 break;
1201         case NL80211_IFTYPE_MESH_POINT:
1202                 if (ieee80211_vif_is_mesh(&sdata->vif))
1203                         ieee80211_mesh_init_sdata(sdata);
1204                 break;
1205         case NL80211_IFTYPE_MONITOR:
1206                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1207                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1208                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1209                                       MONITOR_FLAG_OTHER_BSS;
1210                 break;
1211         case NL80211_IFTYPE_WDS:
1212                 sdata->vif.bss_conf.bssid = NULL;
1213                 break;
1214         case NL80211_IFTYPE_AP_VLAN:
1215                 break;
1216         case NL80211_IFTYPE_P2P_DEVICE:
1217                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1218                 break;
1219         case NL80211_IFTYPE_UNSPECIFIED:
1220         case NUM_NL80211_IFTYPES:
1221                 BUG();
1222                 break;
1223         }
1224
1225         ieee80211_debugfs_add_netdev(sdata);
1226 }
1227
1228 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1229                                            enum nl80211_iftype type)
1230 {
1231         struct ieee80211_local *local = sdata->local;
1232         int ret, err;
1233         enum nl80211_iftype internal_type = type;
1234         bool p2p = false;
1235
1236         ASSERT_RTNL();
1237
1238         if (!local->ops->change_interface)
1239                 return -EBUSY;
1240
1241         switch (sdata->vif.type) {
1242         case NL80211_IFTYPE_AP:
1243         case NL80211_IFTYPE_STATION:
1244         case NL80211_IFTYPE_ADHOC:
1245                 /*
1246                  * Could maybe also all others here?
1247                  * Just not sure how that interacts
1248                  * with the RX/config path e.g. for
1249                  * mesh.
1250                  */
1251                 break;
1252         default:
1253                 return -EBUSY;
1254         }
1255
1256         switch (type) {
1257         case NL80211_IFTYPE_AP:
1258         case NL80211_IFTYPE_STATION:
1259         case NL80211_IFTYPE_ADHOC:
1260                 /*
1261                  * Could probably support everything
1262                  * but WDS here (WDS do_open can fail
1263                  * under memory pressure, which this
1264                  * code isn't prepared to handle).
1265                  */
1266                 break;
1267         case NL80211_IFTYPE_P2P_CLIENT:
1268                 p2p = true;
1269                 internal_type = NL80211_IFTYPE_STATION;
1270                 break;
1271         case NL80211_IFTYPE_P2P_GO:
1272                 p2p = true;
1273                 internal_type = NL80211_IFTYPE_AP;
1274                 break;
1275         default:
1276                 return -EBUSY;
1277         }
1278
1279         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1280         if (ret)
1281                 return ret;
1282
1283         ieee80211_do_stop(sdata, false);
1284
1285         ieee80211_teardown_sdata(sdata);
1286
1287         ret = drv_change_interface(local, sdata, internal_type, p2p);
1288         if (ret)
1289                 type = sdata->vif.type;
1290
1291         /*
1292          * Ignore return value here, there's not much we can do since
1293          * the driver changed the interface type internally already.
1294          * The warnings will hopefully make driver authors fix it :-)
1295          */
1296         ieee80211_check_queues(sdata);
1297
1298         ieee80211_setup_sdata(sdata, type);
1299
1300         err = ieee80211_do_open(&sdata->wdev, false);
1301         WARN(err, "type change: do_open returned %d", err);
1302
1303         return ret;
1304 }
1305
1306 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1307                              enum nl80211_iftype type)
1308 {
1309         int ret;
1310
1311         ASSERT_RTNL();
1312
1313         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1314                 return 0;
1315
1316         if (ieee80211_sdata_running(sdata)) {
1317                 ret = ieee80211_runtime_change_iftype(sdata, type);
1318                 if (ret)
1319                         return ret;
1320         } else {
1321                 /* Purge and reset type-dependent state. */
1322                 ieee80211_teardown_sdata(sdata);
1323                 ieee80211_setup_sdata(sdata, type);
1324         }
1325
1326         /* reset some values that shouldn't be kept across type changes */
1327         sdata->drop_unencrypted = 0;
1328         if (type == NL80211_IFTYPE_STATION)
1329                 sdata->u.mgd.use_4addr = false;
1330
1331         return 0;
1332 }
1333
1334 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1335                                        u8 *perm_addr, enum nl80211_iftype type)
1336 {
1337         struct ieee80211_sub_if_data *sdata;
1338         u64 mask, start, addr, val, inc;
1339         u8 *m;
1340         u8 tmp_addr[ETH_ALEN];
1341         int i;
1342
1343         /* default ... something at least */
1344         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1345
1346         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1347             local->hw.wiphy->n_addresses <= 1)
1348                 return;
1349
1350         mutex_lock(&local->iflist_mtx);
1351
1352         switch (type) {
1353         case NL80211_IFTYPE_MONITOR:
1354                 /* doesn't matter */
1355                 break;
1356         case NL80211_IFTYPE_WDS:
1357         case NL80211_IFTYPE_AP_VLAN:
1358                 /* match up with an AP interface */
1359                 list_for_each_entry(sdata, &local->interfaces, list) {
1360                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1361                                 continue;
1362                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1363                         break;
1364                 }
1365                 /* keep default if no AP interface present */
1366                 break;
1367         case NL80211_IFTYPE_P2P_CLIENT:
1368         case NL80211_IFTYPE_P2P_GO:
1369                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1370                         list_for_each_entry(sdata, &local->interfaces, list) {
1371                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1372                                         continue;
1373                                 if (!ieee80211_sdata_running(sdata))
1374                                         continue;
1375                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1376                                 goto out_unlock;
1377                         }
1378                 }
1379                 /* otherwise fall through */
1380         default:
1381                 /* assign a new address if possible -- try n_addresses first */
1382                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1383                         bool used = false;
1384
1385                         list_for_each_entry(sdata, &local->interfaces, list) {
1386                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1387                                            sdata->vif.addr, ETH_ALEN) == 0) {
1388                                         used = true;
1389                                         break;
1390                                 }
1391                         }
1392
1393                         if (!used) {
1394                                 memcpy(perm_addr,
1395                                        local->hw.wiphy->addresses[i].addr,
1396                                        ETH_ALEN);
1397                                 break;
1398                         }
1399                 }
1400
1401                 /* try mask if available */
1402                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1403                         break;
1404
1405                 m = local->hw.wiphy->addr_mask;
1406                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1407                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1408                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1409
1410                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1411                         /* not a contiguous mask ... not handled now! */
1412                         pr_info("not contiguous\n");
1413                         break;
1414                 }
1415
1416                 m = local->hw.wiphy->perm_addr;
1417                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1418                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1419                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1420
1421                 inc = 1ULL<<__ffs64(mask);
1422                 val = (start & mask);
1423                 addr = (start & ~mask) | (val & mask);
1424                 do {
1425                         bool used = false;
1426
1427                         tmp_addr[5] = addr >> 0*8;
1428                         tmp_addr[4] = addr >> 1*8;
1429                         tmp_addr[3] = addr >> 2*8;
1430                         tmp_addr[2] = addr >> 3*8;
1431                         tmp_addr[1] = addr >> 4*8;
1432                         tmp_addr[0] = addr >> 5*8;
1433
1434                         val += inc;
1435
1436                         list_for_each_entry(sdata, &local->interfaces, list) {
1437                                 if (memcmp(tmp_addr, sdata->vif.addr,
1438                                                         ETH_ALEN) == 0) {
1439                                         used = true;
1440                                         break;
1441                                 }
1442                         }
1443
1444                         if (!used) {
1445                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1446                                 break;
1447                         }
1448                         addr = (start & ~mask) | (val & mask);
1449                 } while (addr != start);
1450
1451                 break;
1452         }
1453
1454  out_unlock:
1455         mutex_unlock(&local->iflist_mtx);
1456 }
1457
1458 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1459 {
1460         struct ieee80211_sub_if_data *sdata;
1461
1462         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1463
1464         ieee80211_cleanup_sdata_stas(sdata);
1465 }
1466
1467 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1468                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1469                      struct vif_params *params)
1470 {
1471         struct net_device *ndev = NULL;
1472         struct ieee80211_sub_if_data *sdata = NULL;
1473         int ret, i;
1474         int txqs = 1;
1475
1476         ASSERT_RTNL();
1477
1478         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1479                 struct wireless_dev *wdev;
1480
1481                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1482                                 GFP_KERNEL);
1483                 if (!sdata)
1484                         return -ENOMEM;
1485                 wdev = &sdata->wdev;
1486
1487                 sdata->dev = NULL;
1488                 strlcpy(sdata->name, name, IFNAMSIZ);
1489                 ieee80211_assign_perm_addr(local, wdev->address, type);
1490                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1491         } else {
1492                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1493                         txqs = IEEE80211_NUM_ACS;
1494
1495                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1496                                         local->hw.vif_data_size,
1497                                         name, ieee80211_if_setup, txqs, 1);
1498                 if (!ndev)
1499                         return -ENOMEM;
1500                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1501
1502                 ndev->needed_headroom = local->tx_headroom +
1503                                         4*6 /* four MAC addresses */
1504                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1505                                         + 6 /* mesh */
1506                                         + 8 /* rfc1042/bridge tunnel */
1507                                         - ETH_HLEN /* ethernet hard_header_len */
1508                                         + IEEE80211_ENCRYPT_HEADROOM;
1509                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1510
1511                 ret = dev_alloc_name(ndev, ndev->name);
1512                 if (ret < 0) {
1513                         free_netdev(ndev);
1514                         return ret;
1515                 }
1516
1517                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1518                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1519                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1520
1521                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1522                 sdata = netdev_priv(ndev);
1523                 ndev->ieee80211_ptr = &sdata->wdev;
1524                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1525                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1526
1527                 sdata->dev = ndev;
1528         }
1529
1530         /* initialise type-independent data */
1531         sdata->wdev.wiphy = local->hw.wiphy;
1532         sdata->local = local;
1533
1534         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1535                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1536
1537         INIT_LIST_HEAD(&sdata->key_list);
1538
1539         spin_lock_init(&sdata->cleanup_stations_lock);
1540         INIT_LIST_HEAD(&sdata->cleanup_stations);
1541         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1542         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1543                           ieee80211_dfs_cac_timer_work);
1544
1545         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1546                 struct ieee80211_supported_band *sband;
1547                 sband = local->hw.wiphy->bands[i];
1548                 sdata->rc_rateidx_mask[i] =
1549                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1550                 if (sband)
1551                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1552                                sband->ht_cap.mcs.rx_mask,
1553                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1554                 else
1555                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1556                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1557         }
1558
1559         ieee80211_set_default_queues(sdata);
1560
1561         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1562         sdata->user_power_level = local->user_power_level;
1563
1564         /* setup type-dependent data */
1565         ieee80211_setup_sdata(sdata, type);
1566
1567         if (ndev) {
1568                 if (params) {
1569                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1570                         if (type == NL80211_IFTYPE_STATION)
1571                                 sdata->u.mgd.use_4addr = params->use_4addr;
1572                 }
1573
1574                 ndev->features |= local->hw.netdev_features;
1575
1576                 ret = register_netdevice(ndev);
1577                 if (ret) {
1578                         free_netdev(ndev);
1579                         return ret;
1580                 }
1581         }
1582
1583         mutex_lock(&local->iflist_mtx);
1584         list_add_tail_rcu(&sdata->list, &local->interfaces);
1585         mutex_unlock(&local->iflist_mtx);
1586
1587         if (new_wdev)
1588                 *new_wdev = &sdata->wdev;
1589
1590         return 0;
1591 }
1592
1593 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1594 {
1595         ASSERT_RTNL();
1596
1597         mutex_lock(&sdata->local->iflist_mtx);
1598         list_del_rcu(&sdata->list);
1599         mutex_unlock(&sdata->local->iflist_mtx);
1600
1601         synchronize_rcu();
1602
1603         if (sdata->dev) {
1604                 unregister_netdevice(sdata->dev);
1605         } else {
1606                 cfg80211_unregister_wdev(&sdata->wdev);
1607                 kfree(sdata);
1608         }
1609 }
1610
1611 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1612 {
1613         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1614                 return;
1615         ieee80211_do_stop(sdata, true);
1616         ieee80211_teardown_sdata(sdata);
1617 }
1618
1619 /*
1620  * Remove all interfaces, may only be called at hardware unregistration
1621  * time because it doesn't do RCU-safe list removals.
1622  */
1623 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1624 {
1625         struct ieee80211_sub_if_data *sdata, *tmp;
1626         LIST_HEAD(unreg_list);
1627         LIST_HEAD(wdev_list);
1628
1629         ASSERT_RTNL();
1630
1631         mutex_lock(&local->iflist_mtx);
1632         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1633                 list_del(&sdata->list);
1634
1635                 if (sdata->dev)
1636                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1637                 else
1638                         list_add(&sdata->list, &wdev_list);
1639         }
1640         mutex_unlock(&local->iflist_mtx);
1641         unregister_netdevice_many(&unreg_list);
1642         list_del(&unreg_list);
1643
1644         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1645                 list_del(&sdata->list);
1646                 cfg80211_unregister_wdev(&sdata->wdev);
1647                 kfree(sdata);
1648         }
1649 }
1650
1651 static int netdev_notify(struct notifier_block *nb,
1652                          unsigned long state,
1653                          void *ndev)
1654 {
1655         struct net_device *dev = ndev;
1656         struct ieee80211_sub_if_data *sdata;
1657
1658         if (state != NETDEV_CHANGENAME)
1659                 return 0;
1660
1661         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1662                 return 0;
1663
1664         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1665                 return 0;
1666
1667         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1668
1669         memcpy(sdata->name, dev->name, IFNAMSIZ);
1670
1671         ieee80211_debugfs_rename_netdev(sdata);
1672         return 0;
1673 }
1674
1675 static struct notifier_block mac80211_netdev_notifier = {
1676         .notifier_call = netdev_notify,
1677 };
1678
1679 int ieee80211_iface_init(void)
1680 {
1681         return register_netdevice_notifier(&mac80211_netdev_notifier);
1682 }
1683
1684 void ieee80211_iface_exit(void)
1685 {
1686         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1687 }