mac80211: don't start new netdev queues if driver stopped
[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                 unsigned long flags;
644                 int n_acs = IEEE80211_NUM_ACS;
645                 int ac;
646
647                 if (local->hw.queues < IEEE80211_NUM_ACS)
648                         n_acs = 1;
649
650                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
651                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
652                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
653                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
654                         for (ac = 0; ac < n_acs; ac++) {
655                                 int ac_queue = sdata->vif.hw_queue[ac];
656
657                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
658                                     skb_queue_empty(&local->pending[ac_queue]))
659                                         netif_start_subqueue(dev, ac);
660                         }
661                 }
662                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
663         }
664
665         return 0;
666  err_del_interface:
667         drv_remove_interface(local, sdata);
668  err_stop:
669         if (!local->open_count)
670                 drv_stop(local);
671  err_del_bss:
672         sdata->bss = NULL;
673         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
674                 list_del(&sdata->u.vlan.list);
675         /* might already be clear but that doesn't matter */
676         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
677         return res;
678 }
679
680 static int ieee80211_open(struct net_device *dev)
681 {
682         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
683         int err;
684
685         /* fail early if user set an invalid address */
686         if (!is_valid_ether_addr(dev->dev_addr))
687                 return -EADDRNOTAVAIL;
688
689         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
690         if (err)
691                 return err;
692
693         return ieee80211_do_open(&sdata->wdev, true);
694 }
695
696 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
697                               bool going_down)
698 {
699         struct ieee80211_local *local = sdata->local;
700         unsigned long flags;
701         struct sk_buff *skb, *tmp;
702         u32 hw_reconf_flags = 0;
703         int i, flushed;
704         struct ps_data *ps;
705
706         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
707
708         if (rcu_access_pointer(local->scan_sdata) == sdata)
709                 ieee80211_scan_cancel(local);
710
711         /*
712          * Stop TX on this interface first.
713          */
714         if (sdata->dev)
715                 netif_tx_stop_all_queues(sdata->dev);
716
717         ieee80211_roc_purge(local, sdata);
718
719         if (sdata->vif.type == NL80211_IFTYPE_STATION)
720                 ieee80211_mgd_stop(sdata);
721
722         /*
723          * Remove all stations associated with this interface.
724          *
725          * This must be done before calling ops->remove_interface()
726          * because otherwise we can later invoke ops->sta_notify()
727          * whenever the STAs are removed, and that invalidates driver
728          * assumptions about always getting a vif pointer that is valid
729          * (because if we remove a STA after ops->remove_interface()
730          * the driver will have removed the vif info already!)
731          *
732          * This is relevant only in WDS mode, in all other modes we've
733          * already removed all stations when disconnecting or similar,
734          * so warn otherwise.
735          *
736          * We call sta_info_flush_cleanup() later, to combine RCU waits.
737          */
738         flushed = sta_info_flush_defer(sdata);
739         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
740                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
741
742         /* don't count this interface for promisc/allmulti while it is down */
743         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
744                 atomic_dec(&local->iff_allmultis);
745
746         if (sdata->flags & IEEE80211_SDATA_PROMISC)
747                 atomic_dec(&local->iff_promiscs);
748
749         if (sdata->vif.type == NL80211_IFTYPE_AP) {
750                 local->fif_pspoll--;
751                 local->fif_probe_req--;
752         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
753                 local->fif_probe_req--;
754         }
755
756         if (sdata->dev) {
757                 netif_addr_lock_bh(sdata->dev);
758                 spin_lock_bh(&local->filter_lock);
759                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
760                                  sdata->dev->addr_len);
761                 spin_unlock_bh(&local->filter_lock);
762                 netif_addr_unlock_bh(sdata->dev);
763         }
764
765         del_timer_sync(&local->dynamic_ps_timer);
766         cancel_work_sync(&local->dynamic_ps_enable_work);
767
768         cancel_work_sync(&sdata->recalc_smps);
769
770         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
771
772         if (sdata->wdev.cac_started) {
773                 WARN_ON(local->suspended);
774                 mutex_lock(&local->iflist_mtx);
775                 ieee80211_vif_release_channel(sdata);
776                 mutex_unlock(&local->iflist_mtx);
777                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
778                                    GFP_KERNEL);
779         }
780
781         /* APs need special treatment */
782         if (sdata->vif.type == NL80211_IFTYPE_AP) {
783                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
784
785                 /* down all dependent devices, that is VLANs */
786                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
787                                          u.vlan.list)
788                         dev_close(vlan->dev);
789                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
790         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
791                 /* remove all packets in parent bc_buf pointing to this dev */
792                 ps = &sdata->bss->ps;
793
794                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
795                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
796                         if (skb->dev == sdata->dev) {
797                                 __skb_unlink(skb, &ps->bc_buf);
798                                 local->total_ps_buffered--;
799                                 ieee80211_free_txskb(&local->hw, skb);
800                         }
801                 }
802                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
803         }
804
805         if (going_down)
806                 local->open_count--;
807
808         switch (sdata->vif.type) {
809         case NL80211_IFTYPE_AP_VLAN:
810                 list_del(&sdata->u.vlan.list);
811                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
812                 /* no need to tell driver */
813                 break;
814         case NL80211_IFTYPE_MONITOR:
815                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
816                         local->cooked_mntrs--;
817                         break;
818                 }
819
820                 local->monitors--;
821                 if (local->monitors == 0) {
822                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
823                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
824                 }
825
826                 ieee80211_adjust_monitor_flags(sdata, -1);
827                 break;
828         case NL80211_IFTYPE_P2P_DEVICE:
829                 /* relies on synchronize_rcu() below */
830                 rcu_assign_pointer(local->p2p_sdata, NULL);
831                 /* fall through */
832         default:
833                 cancel_work_sync(&sdata->work);
834                 /*
835                  * When we get here, the interface is marked down.
836                  *
837                  * sta_info_flush_cleanup() requires rcu_barrier()
838                  * first to wait for the station call_rcu() calls
839                  * to complete, here we need at least sychronize_rcu()
840                  * it to wait for the RX path in case it is using the
841                  * interface and enqueuing frames at this very time on
842                  * another CPU.
843                  */
844                 rcu_barrier();
845                 sta_info_flush_cleanup(sdata);
846
847                 /*
848                  * Free all remaining keys, there shouldn't be any,
849                  * except maybe in WDS mode?
850                  */
851                 ieee80211_free_keys(sdata);
852
853                 /* fall through */
854         case NL80211_IFTYPE_AP:
855                 skb_queue_purge(&sdata->skb_queue);
856         }
857
858         sdata->bss = NULL;
859
860         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
861         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
862                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
863                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
864                         if (info->control.vif == &sdata->vif) {
865                                 __skb_unlink(skb, &local->pending[i]);
866                                 ieee80211_free_txskb(&local->hw, skb);
867                         }
868                 }
869         }
870         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
871
872         if (local->open_count == 0)
873                 ieee80211_clear_tx_pending(local);
874
875         /*
876          * If the interface goes down while suspended, presumably because
877          * the device was unplugged and that happens before our resume,
878          * then the driver is already unconfigured and the remainder of
879          * this function isn't needed.
880          * XXX: what about WoWLAN? If the device has software state, e.g.
881          *      memory allocated, it might expect teardown commands from
882          *      mac80211 here?
883          */
884         if (local->suspended) {
885                 WARN_ON(local->wowlan);
886                 WARN_ON(rtnl_dereference(local->monitor_sdata));
887                 return;
888         }
889
890         switch (sdata->vif.type) {
891         case NL80211_IFTYPE_AP_VLAN:
892                 break;
893         case NL80211_IFTYPE_MONITOR:
894                 if (local->monitors == 0)
895                         ieee80211_del_virtual_monitor(local);
896
897                 mutex_lock(&local->mtx);
898                 ieee80211_recalc_idle(local);
899                 mutex_unlock(&local->mtx);
900                 break;
901         default:
902                 if (going_down)
903                         drv_remove_interface(local, sdata);
904         }
905
906         ieee80211_recalc_ps(local, -1);
907
908         if (local->open_count == 0) {
909                 ieee80211_stop_device(local);
910
911                 /* no reconfiguring after stop! */
912                 return;
913         }
914
915         /* do after stop to avoid reconfiguring when we stop anyway */
916         ieee80211_configure_filter(local);
917         ieee80211_hw_config(local, hw_reconf_flags);
918
919         if (local->monitors == local->open_count)
920                 ieee80211_add_virtual_monitor(local);
921 }
922
923 static int ieee80211_stop(struct net_device *dev)
924 {
925         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
926
927         ieee80211_do_stop(sdata, true);
928
929         return 0;
930 }
931
932 static void ieee80211_set_multicast_list(struct net_device *dev)
933 {
934         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
935         struct ieee80211_local *local = sdata->local;
936         int allmulti, promisc, sdata_allmulti, sdata_promisc;
937
938         allmulti = !!(dev->flags & IFF_ALLMULTI);
939         promisc = !!(dev->flags & IFF_PROMISC);
940         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
941         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
942
943         if (allmulti != sdata_allmulti) {
944                 if (dev->flags & IFF_ALLMULTI)
945                         atomic_inc(&local->iff_allmultis);
946                 else
947                         atomic_dec(&local->iff_allmultis);
948                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
949         }
950
951         if (promisc != sdata_promisc) {
952                 if (dev->flags & IFF_PROMISC)
953                         atomic_inc(&local->iff_promiscs);
954                 else
955                         atomic_dec(&local->iff_promiscs);
956                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
957         }
958
959         /*
960          * TODO: If somebody needs this on AP interfaces,
961          *       it can be enabled easily but multicast
962          *       addresses from VLANs need to be synced.
963          */
964         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
965             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
966             sdata->vif.type != NL80211_IFTYPE_AP)
967                 drv_set_multicast_list(local, sdata, &dev->mc);
968
969         spin_lock_bh(&local->filter_lock);
970         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
971         spin_unlock_bh(&local->filter_lock);
972         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
973 }
974
975 /*
976  * Called when the netdev is removed or, by the code below, before
977  * the interface type changes.
978  */
979 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
980 {
981         int flushed;
982         int i;
983
984         /* free extra data */
985         ieee80211_free_keys(sdata);
986
987         ieee80211_debugfs_remove_netdev(sdata);
988
989         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
990                 __skb_queue_purge(&sdata->fragments[i].skb_list);
991         sdata->fragment_next = 0;
992
993         if (ieee80211_vif_is_mesh(&sdata->vif))
994                 mesh_rmc_free(sdata);
995
996         flushed = sta_info_flush(sdata);
997         WARN_ON(flushed);
998 }
999
1000 static void ieee80211_uninit(struct net_device *dev)
1001 {
1002         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1003 }
1004
1005 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1006                                          struct sk_buff *skb)
1007 {
1008         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1009 }
1010
1011 static const struct net_device_ops ieee80211_dataif_ops = {
1012         .ndo_open               = ieee80211_open,
1013         .ndo_stop               = ieee80211_stop,
1014         .ndo_uninit             = ieee80211_uninit,
1015         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1016         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1017         .ndo_change_mtu         = ieee80211_change_mtu,
1018         .ndo_set_mac_address    = ieee80211_change_mac,
1019         .ndo_select_queue       = ieee80211_netdev_select_queue,
1020 };
1021
1022 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1023                                           struct sk_buff *skb)
1024 {
1025         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1026         struct ieee80211_local *local = sdata->local;
1027         struct ieee80211_hdr *hdr;
1028         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1029
1030         if (local->hw.queues < IEEE80211_NUM_ACS)
1031                 return 0;
1032
1033         if (skb->len < 4 ||
1034             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1035                 return 0; /* doesn't matter, frame will be dropped */
1036
1037         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1038
1039         return ieee80211_select_queue_80211(sdata, skb, hdr);
1040 }
1041
1042 static const struct net_device_ops ieee80211_monitorif_ops = {
1043         .ndo_open               = ieee80211_open,
1044         .ndo_stop               = ieee80211_stop,
1045         .ndo_uninit             = ieee80211_uninit,
1046         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1047         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1048         .ndo_change_mtu         = ieee80211_change_mtu,
1049         .ndo_set_mac_address    = eth_mac_addr,
1050         .ndo_select_queue       = ieee80211_monitor_select_queue,
1051 };
1052
1053 static void ieee80211_if_setup(struct net_device *dev)
1054 {
1055         ether_setup(dev);
1056         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1057         dev->netdev_ops = &ieee80211_dataif_ops;
1058         dev->destructor = free_netdev;
1059 }
1060
1061 static void ieee80211_iface_work(struct work_struct *work)
1062 {
1063         struct ieee80211_sub_if_data *sdata =
1064                 container_of(work, struct ieee80211_sub_if_data, work);
1065         struct ieee80211_local *local = sdata->local;
1066         struct sk_buff *skb;
1067         struct sta_info *sta;
1068         struct ieee80211_ra_tid *ra_tid;
1069
1070         if (!ieee80211_sdata_running(sdata))
1071                 return;
1072
1073         if (local->scanning)
1074                 return;
1075
1076         /*
1077          * ieee80211_queue_work() should have picked up most cases,
1078          * here we'll pick the rest.
1079          */
1080         if (WARN(local->suspended,
1081                  "interface work scheduled while going to suspend\n"))
1082                 return;
1083
1084         /* first process frames */
1085         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1086                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1087
1088                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1089                         ra_tid = (void *)&skb->cb;
1090                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1091                                                  ra_tid->tid);
1092                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1093                         ra_tid = (void *)&skb->cb;
1094                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1095                                                 ra_tid->tid);
1096                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1097                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1098                         int len = skb->len;
1099
1100                         mutex_lock(&local->sta_mtx);
1101                         sta = sta_info_get_bss(sdata, mgmt->sa);
1102                         if (sta) {
1103                                 switch (mgmt->u.action.u.addba_req.action_code) {
1104                                 case WLAN_ACTION_ADDBA_REQ:
1105                                         ieee80211_process_addba_request(
1106                                                         local, sta, mgmt, len);
1107                                         break;
1108                                 case WLAN_ACTION_ADDBA_RESP:
1109                                         ieee80211_process_addba_resp(local, sta,
1110                                                                      mgmt, len);
1111                                         break;
1112                                 case WLAN_ACTION_DELBA:
1113                                         ieee80211_process_delba(sdata, sta,
1114                                                                 mgmt, len);
1115                                         break;
1116                                 default:
1117                                         WARN_ON(1);
1118                                         break;
1119                                 }
1120                         }
1121                         mutex_unlock(&local->sta_mtx);
1122                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1123                         struct ieee80211_hdr *hdr = (void *)mgmt;
1124                         /*
1125                          * So the frame isn't mgmt, but frame_control
1126                          * is at the right place anyway, of course, so
1127                          * the if statement is correct.
1128                          *
1129                          * Warn if we have other data frame types here,
1130                          * they must not get here.
1131                          */
1132                         WARN_ON(hdr->frame_control &
1133                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1134                         WARN_ON(!(hdr->seq_ctrl &
1135                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1136                         /*
1137                          * This was a fragment of a frame, received while
1138                          * a block-ack session was active. That cannot be
1139                          * right, so terminate the session.
1140                          */
1141                         mutex_lock(&local->sta_mtx);
1142                         sta = sta_info_get_bss(sdata, mgmt->sa);
1143                         if (sta) {
1144                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1145                                                 IEEE80211_QOS_CTL_TID_MASK;
1146
1147                                 __ieee80211_stop_rx_ba_session(
1148                                         sta, tid, WLAN_BACK_RECIPIENT,
1149                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1150                                         true);
1151                         }
1152                         mutex_unlock(&local->sta_mtx);
1153                 } else switch (sdata->vif.type) {
1154                 case NL80211_IFTYPE_STATION:
1155                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1156                         break;
1157                 case NL80211_IFTYPE_ADHOC:
1158                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1159                         break;
1160                 case NL80211_IFTYPE_MESH_POINT:
1161                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1162                                 break;
1163                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1164                         break;
1165                 default:
1166                         WARN(1, "frame for unexpected interface type");
1167                         break;
1168                 }
1169
1170                 kfree_skb(skb);
1171         }
1172
1173         /* then other type-dependent work */
1174         switch (sdata->vif.type) {
1175         case NL80211_IFTYPE_STATION:
1176                 ieee80211_sta_work(sdata);
1177                 break;
1178         case NL80211_IFTYPE_ADHOC:
1179                 ieee80211_ibss_work(sdata);
1180                 break;
1181         case NL80211_IFTYPE_MESH_POINT:
1182                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1183                         break;
1184                 ieee80211_mesh_work(sdata);
1185                 break;
1186         default:
1187                 break;
1188         }
1189 }
1190
1191 static void ieee80211_recalc_smps_work(struct work_struct *work)
1192 {
1193         struct ieee80211_sub_if_data *sdata =
1194                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1195
1196         ieee80211_recalc_smps(sdata);
1197 }
1198
1199 /*
1200  * Helper function to initialise an interface to a specific type.
1201  */
1202 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1203                                   enum nl80211_iftype type)
1204 {
1205         /* clear type-dependent union */
1206         memset(&sdata->u, 0, sizeof(sdata->u));
1207
1208         /* and set some type-dependent values */
1209         sdata->vif.type = type;
1210         sdata->vif.p2p = false;
1211         sdata->wdev.iftype = type;
1212
1213         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1214         sdata->control_port_no_encrypt = false;
1215
1216         sdata->noack_map = 0;
1217
1218         /* only monitor/p2p-device differ */
1219         if (sdata->dev) {
1220                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1221                 sdata->dev->type = ARPHRD_ETHER;
1222         }
1223
1224         skb_queue_head_init(&sdata->skb_queue);
1225         INIT_WORK(&sdata->work, ieee80211_iface_work);
1226         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1227
1228         switch (type) {
1229         case NL80211_IFTYPE_P2P_GO:
1230                 type = NL80211_IFTYPE_AP;
1231                 sdata->vif.type = type;
1232                 sdata->vif.p2p = true;
1233                 /* fall through */
1234         case NL80211_IFTYPE_AP:
1235                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1236                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1237                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1238                 break;
1239         case NL80211_IFTYPE_P2P_CLIENT:
1240                 type = NL80211_IFTYPE_STATION;
1241                 sdata->vif.type = type;
1242                 sdata->vif.p2p = true;
1243                 /* fall through */
1244         case NL80211_IFTYPE_STATION:
1245                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1246                 ieee80211_sta_setup_sdata(sdata);
1247                 break;
1248         case NL80211_IFTYPE_ADHOC:
1249                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1250                 ieee80211_ibss_setup_sdata(sdata);
1251                 break;
1252         case NL80211_IFTYPE_MESH_POINT:
1253                 if (ieee80211_vif_is_mesh(&sdata->vif))
1254                         ieee80211_mesh_init_sdata(sdata);
1255                 break;
1256         case NL80211_IFTYPE_MONITOR:
1257                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1258                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1259                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1260                                       MONITOR_FLAG_OTHER_BSS;
1261                 break;
1262         case NL80211_IFTYPE_WDS:
1263                 sdata->vif.bss_conf.bssid = NULL;
1264                 break;
1265         case NL80211_IFTYPE_AP_VLAN:
1266                 break;
1267         case NL80211_IFTYPE_P2P_DEVICE:
1268                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1269                 break;
1270         case NL80211_IFTYPE_UNSPECIFIED:
1271         case NUM_NL80211_IFTYPES:
1272                 BUG();
1273                 break;
1274         }
1275
1276         ieee80211_debugfs_add_netdev(sdata);
1277 }
1278
1279 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1280                                            enum nl80211_iftype type)
1281 {
1282         struct ieee80211_local *local = sdata->local;
1283         int ret, err;
1284         enum nl80211_iftype internal_type = type;
1285         bool p2p = false;
1286
1287         ASSERT_RTNL();
1288
1289         if (!local->ops->change_interface)
1290                 return -EBUSY;
1291
1292         switch (sdata->vif.type) {
1293         case NL80211_IFTYPE_AP:
1294         case NL80211_IFTYPE_STATION:
1295         case NL80211_IFTYPE_ADHOC:
1296                 /*
1297                  * Could maybe also all others here?
1298                  * Just not sure how that interacts
1299                  * with the RX/config path e.g. for
1300                  * mesh.
1301                  */
1302                 break;
1303         default:
1304                 return -EBUSY;
1305         }
1306
1307         switch (type) {
1308         case NL80211_IFTYPE_AP:
1309         case NL80211_IFTYPE_STATION:
1310         case NL80211_IFTYPE_ADHOC:
1311                 /*
1312                  * Could probably support everything
1313                  * but WDS here (WDS do_open can fail
1314                  * under memory pressure, which this
1315                  * code isn't prepared to handle).
1316                  */
1317                 break;
1318         case NL80211_IFTYPE_P2P_CLIENT:
1319                 p2p = true;
1320                 internal_type = NL80211_IFTYPE_STATION;
1321                 break;
1322         case NL80211_IFTYPE_P2P_GO:
1323                 p2p = true;
1324                 internal_type = NL80211_IFTYPE_AP;
1325                 break;
1326         default:
1327                 return -EBUSY;
1328         }
1329
1330         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1331         if (ret)
1332                 return ret;
1333
1334         ieee80211_do_stop(sdata, false);
1335
1336         ieee80211_teardown_sdata(sdata);
1337
1338         ret = drv_change_interface(local, sdata, internal_type, p2p);
1339         if (ret)
1340                 type = sdata->vif.type;
1341
1342         /*
1343          * Ignore return value here, there's not much we can do since
1344          * the driver changed the interface type internally already.
1345          * The warnings will hopefully make driver authors fix it :-)
1346          */
1347         ieee80211_check_queues(sdata);
1348
1349         ieee80211_setup_sdata(sdata, type);
1350
1351         err = ieee80211_do_open(&sdata->wdev, false);
1352         WARN(err, "type change: do_open returned %d", err);
1353
1354         return ret;
1355 }
1356
1357 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1358                              enum nl80211_iftype type)
1359 {
1360         int ret;
1361
1362         ASSERT_RTNL();
1363
1364         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1365                 return 0;
1366
1367         if (ieee80211_sdata_running(sdata)) {
1368                 ret = ieee80211_runtime_change_iftype(sdata, type);
1369                 if (ret)
1370                         return ret;
1371         } else {
1372                 /* Purge and reset type-dependent state. */
1373                 ieee80211_teardown_sdata(sdata);
1374                 ieee80211_setup_sdata(sdata, type);
1375         }
1376
1377         /* reset some values that shouldn't be kept across type changes */
1378         sdata->drop_unencrypted = 0;
1379         if (type == NL80211_IFTYPE_STATION)
1380                 sdata->u.mgd.use_4addr = false;
1381
1382         return 0;
1383 }
1384
1385 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1386                                        u8 *perm_addr, enum nl80211_iftype type)
1387 {
1388         struct ieee80211_sub_if_data *sdata;
1389         u64 mask, start, addr, val, inc;
1390         u8 *m;
1391         u8 tmp_addr[ETH_ALEN];
1392         int i;
1393
1394         /* default ... something at least */
1395         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1396
1397         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1398             local->hw.wiphy->n_addresses <= 1)
1399                 return;
1400
1401         mutex_lock(&local->iflist_mtx);
1402
1403         switch (type) {
1404         case NL80211_IFTYPE_MONITOR:
1405                 /* doesn't matter */
1406                 break;
1407         case NL80211_IFTYPE_WDS:
1408         case NL80211_IFTYPE_AP_VLAN:
1409                 /* match up with an AP interface */
1410                 list_for_each_entry(sdata, &local->interfaces, list) {
1411                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1412                                 continue;
1413                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1414                         break;
1415                 }
1416                 /* keep default if no AP interface present */
1417                 break;
1418         case NL80211_IFTYPE_P2P_CLIENT:
1419         case NL80211_IFTYPE_P2P_GO:
1420                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1421                         list_for_each_entry(sdata, &local->interfaces, list) {
1422                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1423                                         continue;
1424                                 if (!ieee80211_sdata_running(sdata))
1425                                         continue;
1426                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1427                                 goto out_unlock;
1428                         }
1429                 }
1430                 /* otherwise fall through */
1431         default:
1432                 /* assign a new address if possible -- try n_addresses first */
1433                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1434                         bool used = false;
1435
1436                         list_for_each_entry(sdata, &local->interfaces, list) {
1437                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1438                                            sdata->vif.addr, ETH_ALEN) == 0) {
1439                                         used = true;
1440                                         break;
1441                                 }
1442                         }
1443
1444                         if (!used) {
1445                                 memcpy(perm_addr,
1446                                        local->hw.wiphy->addresses[i].addr,
1447                                        ETH_ALEN);
1448                                 break;
1449                         }
1450                 }
1451
1452                 /* try mask if available */
1453                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1454                         break;
1455
1456                 m = local->hw.wiphy->addr_mask;
1457                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1458                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1459                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1460
1461                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1462                         /* not a contiguous mask ... not handled now! */
1463                         pr_info("not contiguous\n");
1464                         break;
1465                 }
1466
1467                 m = local->hw.wiphy->perm_addr;
1468                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1469                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1470                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1471
1472                 inc = 1ULL<<__ffs64(mask);
1473                 val = (start & mask);
1474                 addr = (start & ~mask) | (val & mask);
1475                 do {
1476                         bool used = false;
1477
1478                         tmp_addr[5] = addr >> 0*8;
1479                         tmp_addr[4] = addr >> 1*8;
1480                         tmp_addr[3] = addr >> 2*8;
1481                         tmp_addr[2] = addr >> 3*8;
1482                         tmp_addr[1] = addr >> 4*8;
1483                         tmp_addr[0] = addr >> 5*8;
1484
1485                         val += inc;
1486
1487                         list_for_each_entry(sdata, &local->interfaces, list) {
1488                                 if (memcmp(tmp_addr, sdata->vif.addr,
1489                                                         ETH_ALEN) == 0) {
1490                                         used = true;
1491                                         break;
1492                                 }
1493                         }
1494
1495                         if (!used) {
1496                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1497                                 break;
1498                         }
1499                         addr = (start & ~mask) | (val & mask);
1500                 } while (addr != start);
1501
1502                 break;
1503         }
1504
1505  out_unlock:
1506         mutex_unlock(&local->iflist_mtx);
1507 }
1508
1509 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1510 {
1511         struct ieee80211_sub_if_data *sdata;
1512
1513         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1514
1515         ieee80211_cleanup_sdata_stas(sdata);
1516 }
1517
1518 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1519                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1520                      struct vif_params *params)
1521 {
1522         struct net_device *ndev = NULL;
1523         struct ieee80211_sub_if_data *sdata = NULL;
1524         int ret, i;
1525         int txqs = 1;
1526
1527         ASSERT_RTNL();
1528
1529         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1530                 struct wireless_dev *wdev;
1531
1532                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1533                                 GFP_KERNEL);
1534                 if (!sdata)
1535                         return -ENOMEM;
1536                 wdev = &sdata->wdev;
1537
1538                 sdata->dev = NULL;
1539                 strlcpy(sdata->name, name, IFNAMSIZ);
1540                 ieee80211_assign_perm_addr(local, wdev->address, type);
1541                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1542         } else {
1543                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1544                         txqs = IEEE80211_NUM_ACS;
1545
1546                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1547                                         local->hw.vif_data_size,
1548                                         name, ieee80211_if_setup, txqs, 1);
1549                 if (!ndev)
1550                         return -ENOMEM;
1551                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1552
1553                 ndev->needed_headroom = local->tx_headroom +
1554                                         4*6 /* four MAC addresses */
1555                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1556                                         + 6 /* mesh */
1557                                         + 8 /* rfc1042/bridge tunnel */
1558                                         - ETH_HLEN /* ethernet hard_header_len */
1559                                         + IEEE80211_ENCRYPT_HEADROOM;
1560                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1561
1562                 ret = dev_alloc_name(ndev, ndev->name);
1563                 if (ret < 0) {
1564                         free_netdev(ndev);
1565                         return ret;
1566                 }
1567
1568                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1569                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1570                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1571
1572                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1573                 sdata = netdev_priv(ndev);
1574                 ndev->ieee80211_ptr = &sdata->wdev;
1575                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1576                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1577
1578                 sdata->dev = ndev;
1579         }
1580
1581         /* initialise type-independent data */
1582         sdata->wdev.wiphy = local->hw.wiphy;
1583         sdata->local = local;
1584
1585         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1586                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1587
1588         INIT_LIST_HEAD(&sdata->key_list);
1589
1590         spin_lock_init(&sdata->cleanup_stations_lock);
1591         INIT_LIST_HEAD(&sdata->cleanup_stations);
1592         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1593         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1594                           ieee80211_dfs_cac_timer_work);
1595         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1596                           ieee80211_delayed_tailroom_dec);
1597
1598         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1599                 struct ieee80211_supported_band *sband;
1600                 sband = local->hw.wiphy->bands[i];
1601                 sdata->rc_rateidx_mask[i] =
1602                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1603                 if (sband)
1604                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1605                                sband->ht_cap.mcs.rx_mask,
1606                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1607                 else
1608                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1609                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1610         }
1611
1612         ieee80211_set_default_queues(sdata);
1613
1614         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1615         sdata->user_power_level = local->user_power_level;
1616
1617         /* setup type-dependent data */
1618         ieee80211_setup_sdata(sdata, type);
1619
1620         if (ndev) {
1621                 if (params) {
1622                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1623                         if (type == NL80211_IFTYPE_STATION)
1624                                 sdata->u.mgd.use_4addr = params->use_4addr;
1625                 }
1626
1627                 ndev->features |= local->hw.netdev_features;
1628
1629                 ret = register_netdevice(ndev);
1630                 if (ret) {
1631                         free_netdev(ndev);
1632                         return ret;
1633                 }
1634         }
1635
1636         mutex_lock(&local->iflist_mtx);
1637         list_add_tail_rcu(&sdata->list, &local->interfaces);
1638         mutex_unlock(&local->iflist_mtx);
1639
1640         if (new_wdev)
1641                 *new_wdev = &sdata->wdev;
1642
1643         return 0;
1644 }
1645
1646 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1647 {
1648         ASSERT_RTNL();
1649
1650         mutex_lock(&sdata->local->iflist_mtx);
1651         list_del_rcu(&sdata->list);
1652         mutex_unlock(&sdata->local->iflist_mtx);
1653
1654         synchronize_rcu();
1655
1656         if (sdata->dev) {
1657                 unregister_netdevice(sdata->dev);
1658         } else {
1659                 cfg80211_unregister_wdev(&sdata->wdev);
1660                 kfree(sdata);
1661         }
1662 }
1663
1664 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1665 {
1666         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1667                 return;
1668         ieee80211_do_stop(sdata, true);
1669         ieee80211_teardown_sdata(sdata);
1670 }
1671
1672 /*
1673  * Remove all interfaces, may only be called at hardware unregistration
1674  * time because it doesn't do RCU-safe list removals.
1675  */
1676 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1677 {
1678         struct ieee80211_sub_if_data *sdata, *tmp;
1679         LIST_HEAD(unreg_list);
1680         LIST_HEAD(wdev_list);
1681
1682         ASSERT_RTNL();
1683
1684         mutex_lock(&local->iflist_mtx);
1685         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1686                 list_del(&sdata->list);
1687
1688                 if (sdata->dev)
1689                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1690                 else
1691                         list_add(&sdata->list, &wdev_list);
1692         }
1693         mutex_unlock(&local->iflist_mtx);
1694         unregister_netdevice_many(&unreg_list);
1695         list_del(&unreg_list);
1696
1697         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1698                 list_del(&sdata->list);
1699                 cfg80211_unregister_wdev(&sdata->wdev);
1700                 kfree(sdata);
1701         }
1702 }
1703
1704 static int netdev_notify(struct notifier_block *nb,
1705                          unsigned long state,
1706                          void *ndev)
1707 {
1708         struct net_device *dev = ndev;
1709         struct ieee80211_sub_if_data *sdata;
1710
1711         if (state != NETDEV_CHANGENAME)
1712                 return 0;
1713
1714         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1715                 return 0;
1716
1717         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1718                 return 0;
1719
1720         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1721
1722         memcpy(sdata->name, dev->name, IFNAMSIZ);
1723
1724         ieee80211_debugfs_rename_netdev(sdata);
1725         return 0;
1726 }
1727
1728 static struct notifier_block mac80211_netdev_notifier = {
1729         .notifier_call = netdev_notify,
1730 };
1731
1732 int ieee80211_iface_init(void)
1733 {
1734         return register_netdevice_notifier(&mac80211_netdev_notifier);
1735 }
1736
1737 void ieee80211_iface_exit(void)
1738 {
1739         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1740 }