mac80211: fix LED in idle handling
[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 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102                                    bool force_active)
103 {
104         bool working = false, scanning, active;
105         unsigned int led_trig_start = 0, led_trig_stop = 0;
106         struct ieee80211_roc_work *roc;
107
108         lockdep_assert_held(&local->mtx);
109
110         active = force_active ||
111                  !list_empty(&local->chanctx_list) ||
112                  local->monitors;
113
114         if (!local->ops->remain_on_channel) {
115                 list_for_each_entry(roc, &local->roc_list, list) {
116                         working = true;
117                         break;
118                 }
119         }
120
121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124         if (working || scanning)
125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126         else
127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129         if (active)
130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131         else
132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136         if (working || scanning || active)
137                 return __ieee80211_idle_off(local);
138         return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143         return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148         u32 change = __ieee80211_recalc_idle(local, false);
149         if (change)
150                 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156                 return -EINVAL;
157
158         dev->mtu = new_mtu;
159         return 0;
160 }
161
162 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
163 {
164         struct ieee80211_sub_if_data *sdata;
165         u64 new, mask, tmp;
166         u8 *m;
167         int ret = 0;
168
169         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
170                 return 0;
171
172         m = addr;
173         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176
177         m = local->hw.wiphy->addr_mask;
178         mask =  ((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
183         mutex_lock(&local->iflist_mtx);
184         list_for_each_entry(sdata, &local->interfaces, list) {
185                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
186                         continue;
187
188                 m = sdata->vif.addr;
189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192
193                 if ((new & ~mask) != (tmp & ~mask)) {
194                         ret = -EINVAL;
195                         break;
196                 }
197         }
198         mutex_unlock(&local->iflist_mtx);
199
200         return ret;
201 }
202
203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
204 {
205         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
206         struct sockaddr *sa = addr;
207         int ret;
208
209         if (ieee80211_sdata_running(sdata))
210                 return -EBUSY;
211
212         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
213         if (ret)
214                 return ret;
215
216         ret = eth_mac_addr(dev, sa);
217
218         if (ret == 0)
219                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
220
221         return ret;
222 }
223
224 static inline int identical_mac_addr_allowed(int type1, int type2)
225 {
226         return type1 == NL80211_IFTYPE_MONITOR ||
227                 type2 == NL80211_IFTYPE_MONITOR ||
228                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
229                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
230                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
231                 (type1 == NL80211_IFTYPE_WDS &&
232                         (type2 == NL80211_IFTYPE_WDS ||
233                          type2 == NL80211_IFTYPE_AP)) ||
234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
235                 (type1 == NL80211_IFTYPE_AP_VLAN &&
236                         (type2 == NL80211_IFTYPE_AP ||
237                          type2 == NL80211_IFTYPE_AP_VLAN));
238 }
239
240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
241                                             enum nl80211_iftype iftype)
242 {
243         struct ieee80211_local *local = sdata->local;
244         struct ieee80211_sub_if_data *nsdata;
245
246         ASSERT_RTNL();
247
248         /* we hold the RTNL here so can safely walk the list */
249         list_for_each_entry(nsdata, &local->interfaces, list) {
250                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
251                         /*
252                          * Allow only a single IBSS interface to be up at any
253                          * time. This is restricted because beacon distribution
254                          * cannot work properly if both are in the same IBSS.
255                          *
256                          * To remove this restriction we'd have to disallow them
257                          * from setting the same SSID on different IBSS interfaces
258                          * belonging to the same hardware. Then, however, we're
259                          * faced with having to adopt two different TSF timers...
260                          */
261                         if (iftype == NL80211_IFTYPE_ADHOC &&
262                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
263                                 return -EBUSY;
264
265                         /*
266                          * The remaining checks are only performed for interfaces
267                          * with the same MAC address.
268                          */
269                         if (!ether_addr_equal(sdata->vif.addr,
270                                               nsdata->vif.addr))
271                                 continue;
272
273                         /*
274                          * check whether it may have the same address
275                          */
276                         if (!identical_mac_addr_allowed(iftype,
277                                                         nsdata->vif.type))
278                                 return -ENOTUNIQ;
279
280                         /*
281                          * can only add VLANs to enabled APs
282                          */
283                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
284                             nsdata->vif.type == NL80211_IFTYPE_AP)
285                                 sdata->bss = &nsdata->u.ap;
286                 }
287         }
288
289         return 0;
290 }
291
292 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
293 {
294         int n_queues = sdata->local->hw.queues;
295         int i;
296
297         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
298                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
299                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
300                                          IEEE80211_INVAL_HW_QUEUE))
301                                 return -EINVAL;
302                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
303                                          n_queues))
304                                 return -EINVAL;
305                 }
306         }
307
308         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
309              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
310             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
311                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
312                 return 0;
313         }
314
315         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
316                 return -EINVAL;
317
318         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
319                 return -EINVAL;
320
321         return 0;
322 }
323
324 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
325                                     const int offset)
326 {
327         struct ieee80211_local *local = sdata->local;
328         u32 flags = sdata->u.mntr_flags;
329
330 #define ADJUST(_f, _s)  do {                                    \
331         if (flags & MONITOR_FLAG_##_f)                          \
332                 local->fif_##_s += offset;                      \
333         } while (0)
334
335         ADJUST(FCSFAIL, fcsfail);
336         ADJUST(PLCPFAIL, plcpfail);
337         ADJUST(CONTROL, control);
338         ADJUST(CONTROL, pspoll);
339         ADJUST(OTHER_BSS, other_bss);
340
341 #undef ADJUST
342 }
343
344 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
345 {
346         struct ieee80211_local *local = sdata->local;
347         int i;
348
349         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
350                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
351                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
352                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
353                         sdata->vif.hw_queue[i] = i;
354                 else
355                         sdata->vif.hw_queue[i] = 0;
356         }
357         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
358 }
359
360 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
361 {
362         struct ieee80211_sub_if_data *sdata;
363         int ret;
364
365         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
366                 return 0;
367
368         ASSERT_RTNL();
369
370         if (local->monitor_sdata)
371                 return 0;
372
373         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
374         if (!sdata)
375                 return -ENOMEM;
376
377         /* set up data */
378         sdata->local = local;
379         sdata->vif.type = NL80211_IFTYPE_MONITOR;
380         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
381                  wiphy_name(local->hw.wiphy));
382
383         ieee80211_set_default_queues(sdata);
384
385         ret = drv_add_interface(local, sdata);
386         if (WARN_ON(ret)) {
387                 /* ok .. stupid driver, it asked for this! */
388                 kfree(sdata);
389                 return ret;
390         }
391
392         ret = ieee80211_check_queues(sdata);
393         if (ret) {
394                 kfree(sdata);
395                 return ret;
396         }
397
398         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
399                                         IEEE80211_CHANCTX_EXCLUSIVE);
400         if (ret) {
401                 drv_remove_interface(local, sdata);
402                 kfree(sdata);
403                 return ret;
404         }
405
406         mutex_lock(&local->iflist_mtx);
407         rcu_assign_pointer(local->monitor_sdata, sdata);
408         mutex_unlock(&local->iflist_mtx);
409
410         return 0;
411 }
412
413 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
414 {
415         struct ieee80211_sub_if_data *sdata;
416
417         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
418                 return;
419
420         ASSERT_RTNL();
421
422         mutex_lock(&local->iflist_mtx);
423
424         sdata = rcu_dereference_protected(local->monitor_sdata,
425                                           lockdep_is_held(&local->iflist_mtx));
426         if (!sdata) {
427                 mutex_unlock(&local->iflist_mtx);
428                 return;
429         }
430
431         rcu_assign_pointer(local->monitor_sdata, NULL);
432         mutex_unlock(&local->iflist_mtx);
433
434         synchronize_net();
435
436         ieee80211_vif_release_channel(sdata);
437
438         drv_remove_interface(local, sdata);
439
440         kfree(sdata);
441 }
442
443 /*
444  * NOTE: Be very careful when changing this function, it must NOT return
445  * an error on interface type changes that have been pre-checked, so most
446  * checks should be in ieee80211_check_concurrent_iface.
447  */
448 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
449 {
450         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
451         struct net_device *dev = wdev->netdev;
452         struct ieee80211_local *local = sdata->local;
453         struct sta_info *sta;
454         u32 changed = 0;
455         int res;
456         u32 hw_reconf_flags = 0;
457
458         switch (sdata->vif.type) {
459         case NL80211_IFTYPE_WDS:
460                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
461                         return -ENOLINK;
462                 break;
463         case NL80211_IFTYPE_AP_VLAN: {
464                 struct ieee80211_sub_if_data *master;
465
466                 if (!sdata->bss)
467                         return -ENOLINK;
468
469                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
470
471                 master = container_of(sdata->bss,
472                                       struct ieee80211_sub_if_data, u.ap);
473                 sdata->control_port_protocol =
474                         master->control_port_protocol;
475                 sdata->control_port_no_encrypt =
476                         master->control_port_no_encrypt;
477                 break;
478                 }
479         case NL80211_IFTYPE_AP:
480                 sdata->bss = &sdata->u.ap;
481                 break;
482         case NL80211_IFTYPE_MESH_POINT:
483         case NL80211_IFTYPE_STATION:
484         case NL80211_IFTYPE_MONITOR:
485         case NL80211_IFTYPE_ADHOC:
486         case NL80211_IFTYPE_P2P_DEVICE:
487                 /* no special treatment */
488                 break;
489         case NL80211_IFTYPE_UNSPECIFIED:
490         case NUM_NL80211_IFTYPES:
491         case NL80211_IFTYPE_P2P_CLIENT:
492         case NL80211_IFTYPE_P2P_GO:
493                 /* cannot happen */
494                 WARN_ON(1);
495                 break;
496         }
497
498         if (local->open_count == 0) {
499                 res = drv_start(local);
500                 if (res)
501                         goto err_del_bss;
502                 if (local->ops->napi_poll)
503                         napi_enable(&local->napi);
504                 /* we're brought up, everything changes */
505                 hw_reconf_flags = ~0;
506                 ieee80211_led_radio(local, true);
507                 ieee80211_mod_tpt_led_trig(local,
508                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
509         }
510
511         /*
512          * Copy the hopefully now-present MAC address to
513          * this interface, if it has the special null one.
514          */
515         if (dev && is_zero_ether_addr(dev->dev_addr)) {
516                 memcpy(dev->dev_addr,
517                        local->hw.wiphy->perm_addr,
518                        ETH_ALEN);
519                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
520
521                 if (!is_valid_ether_addr(dev->dev_addr)) {
522                         res = -EADDRNOTAVAIL;
523                         goto err_stop;
524                 }
525         }
526
527         switch (sdata->vif.type) {
528         case NL80211_IFTYPE_AP_VLAN:
529                 /* no need to tell driver, but set carrier and chanctx */
530                 if (rtnl_dereference(sdata->bss->beacon)) {
531                         ieee80211_vif_vlan_copy_chanctx(sdata);
532                         netif_carrier_on(dev);
533                 } else {
534                         netif_carrier_off(dev);
535                 }
536                 break;
537         case NL80211_IFTYPE_MONITOR:
538                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
539                         local->cooked_mntrs++;
540                         break;
541                 }
542
543                 if (local->monitors == 0 && local->open_count == 0) {
544                         res = ieee80211_add_virtual_monitor(local);
545                         if (res)
546                                 goto err_stop;
547                 }
548
549                 /* must be before the call to ieee80211_configure_filter */
550                 local->monitors++;
551                 if (local->monitors == 1) {
552                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
553                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
554                 }
555
556                 ieee80211_adjust_monitor_flags(sdata, 1);
557                 ieee80211_configure_filter(local);
558                 mutex_lock(&local->mtx);
559                 ieee80211_recalc_idle(local);
560                 mutex_unlock(&local->mtx);
561
562                 netif_carrier_on(dev);
563                 break;
564         default:
565                 if (coming_up) {
566                         ieee80211_del_virtual_monitor(local);
567
568                         res = drv_add_interface(local, sdata);
569                         if (res)
570                                 goto err_stop;
571                         res = ieee80211_check_queues(sdata);
572                         if (res)
573                                 goto err_del_interface;
574                 }
575
576                 drv_add_interface_debugfs(local, sdata);
577
578                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
579                         local->fif_pspoll++;
580                         local->fif_probe_req++;
581
582                         ieee80211_configure_filter(local);
583                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
584                         local->fif_probe_req++;
585                 }
586
587                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
588                         changed |= ieee80211_reset_erp_info(sdata);
589                 ieee80211_bss_info_change_notify(sdata, changed);
590
591                 switch (sdata->vif.type) {
592                 case NL80211_IFTYPE_STATION:
593                 case NL80211_IFTYPE_ADHOC:
594                 case NL80211_IFTYPE_AP:
595                 case NL80211_IFTYPE_MESH_POINT:
596                         netif_carrier_off(dev);
597                         break;
598                 case NL80211_IFTYPE_WDS:
599                 case NL80211_IFTYPE_P2P_DEVICE:
600                         break;
601                 default:
602                         netif_carrier_on(dev);
603                 }
604
605                 /*
606                  * set default queue parameters so drivers don't
607                  * need to initialise the hardware if the hardware
608                  * doesn't start up with sane defaults
609                  */
610                 ieee80211_set_wmm_default(sdata, true);
611         }
612
613         set_bit(SDATA_STATE_RUNNING, &sdata->state);
614
615         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
616                 /* Create STA entry for the WDS peer */
617                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
618                                      GFP_KERNEL);
619                 if (!sta) {
620                         res = -ENOMEM;
621                         goto err_del_interface;
622                 }
623
624                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
625                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
626                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
627
628                 res = sta_info_insert(sta);
629                 if (res) {
630                         /* STA has been freed */
631                         goto err_del_interface;
632                 }
633
634                 rate_control_rate_init(sta);
635                 netif_carrier_on(dev);
636         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
637                 rcu_assign_pointer(local->p2p_sdata, sdata);
638         }
639
640         /*
641          * set_multicast_list will be invoked by the networking core
642          * which will check whether any increments here were done in
643          * error and sync them down to the hardware as filter flags.
644          */
645         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
646                 atomic_inc(&local->iff_allmultis);
647
648         if (sdata->flags & IEEE80211_SDATA_PROMISC)
649                 atomic_inc(&local->iff_promiscs);
650
651         if (coming_up)
652                 local->open_count++;
653
654         if (hw_reconf_flags)
655                 ieee80211_hw_config(local, hw_reconf_flags);
656
657         ieee80211_recalc_ps(local, -1);
658
659         if (dev)
660                 netif_tx_start_all_queues(dev);
661
662         return 0;
663  err_del_interface:
664         drv_remove_interface(local, sdata);
665  err_stop:
666         if (!local->open_count)
667                 drv_stop(local);
668  err_del_bss:
669         sdata->bss = NULL;
670         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
671                 list_del(&sdata->u.vlan.list);
672         /* might already be clear but that doesn't matter */
673         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
674         return res;
675 }
676
677 static int ieee80211_open(struct net_device *dev)
678 {
679         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
680         int err;
681
682         /* fail early if user set an invalid address */
683         if (!is_valid_ether_addr(dev->dev_addr))
684                 return -EADDRNOTAVAIL;
685
686         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
687         if (err)
688                 return err;
689
690         return ieee80211_do_open(&sdata->wdev, true);
691 }
692
693 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
694                               bool going_down)
695 {
696         struct ieee80211_local *local = sdata->local;
697         unsigned long flags;
698         struct sk_buff *skb, *tmp;
699         u32 hw_reconf_flags = 0;
700         int i, flushed;
701         struct ps_data *ps;
702
703         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
704
705         if (rcu_access_pointer(local->scan_sdata) == sdata)
706                 ieee80211_scan_cancel(local);
707
708         /*
709          * Stop TX on this interface first.
710          */
711         if (sdata->dev)
712                 netif_tx_stop_all_queues(sdata->dev);
713
714         ieee80211_roc_purge(sdata);
715
716         if (sdata->vif.type == NL80211_IFTYPE_STATION)
717                 ieee80211_mgd_stop(sdata);
718
719         /*
720          * Remove all stations associated with this interface.
721          *
722          * This must be done before calling ops->remove_interface()
723          * because otherwise we can later invoke ops->sta_notify()
724          * whenever the STAs are removed, and that invalidates driver
725          * assumptions about always getting a vif pointer that is valid
726          * (because if we remove a STA after ops->remove_interface()
727          * the driver will have removed the vif info already!)
728          *
729          * This is relevant only in WDS mode, in all other modes we've
730          * already removed all stations when disconnecting or similar,
731          * so warn otherwise.
732          *
733          * We call sta_info_flush_cleanup() later, to combine RCU waits.
734          */
735         flushed = sta_info_flush_defer(sdata);
736         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
737                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
738
739         /*
740          * Don't count this interface for promisc/allmulti while it
741          * is down. dev_mc_unsync() will invoke set_multicast_list
742          * on the master interface which will sync these down to the
743          * hardware as filter flags.
744          */
745         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
746                 atomic_dec(&local->iff_allmultis);
747
748         if (sdata->flags & IEEE80211_SDATA_PROMISC)
749                 atomic_dec(&local->iff_promiscs);
750
751         if (sdata->vif.type == NL80211_IFTYPE_AP) {
752                 local->fif_pspoll--;
753                 local->fif_probe_req--;
754         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
755                 local->fif_probe_req--;
756         }
757
758         if (sdata->dev) {
759                 netif_addr_lock_bh(sdata->dev);
760                 spin_lock_bh(&local->filter_lock);
761                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
762                                  sdata->dev->addr_len);
763                 spin_unlock_bh(&local->filter_lock);
764                 netif_addr_unlock_bh(sdata->dev);
765
766                 ieee80211_configure_filter(local);
767         }
768
769         del_timer_sync(&local->dynamic_ps_timer);
770         cancel_work_sync(&local->dynamic_ps_enable_work);
771
772         cancel_work_sync(&sdata->recalc_smps);
773
774         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
775
776         if (sdata->wdev.cac_started) {
777                 mutex_lock(&local->iflist_mtx);
778                 ieee80211_vif_release_channel(sdata);
779                 mutex_unlock(&local->iflist_mtx);
780                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
781                                    GFP_KERNEL);
782         }
783
784         /* APs need special treatment */
785         if (sdata->vif.type == NL80211_IFTYPE_AP) {
786                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
787
788                 /* down all dependent devices, that is VLANs */
789                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
790                                          u.vlan.list)
791                         dev_close(vlan->dev);
792                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
793         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
794                 /* remove all packets in parent bc_buf pointing to this dev */
795                 ps = &sdata->bss->ps;
796
797                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
798                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
799                         if (skb->dev == sdata->dev) {
800                                 __skb_unlink(skb, &ps->bc_buf);
801                                 local->total_ps_buffered--;
802                                 ieee80211_free_txskb(&local->hw, skb);
803                         }
804                 }
805                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
806         }
807
808         if (going_down)
809                 local->open_count--;
810
811         switch (sdata->vif.type) {
812         case NL80211_IFTYPE_AP_VLAN:
813                 list_del(&sdata->u.vlan.list);
814                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
815                 /* no need to tell driver */
816                 break;
817         case NL80211_IFTYPE_MONITOR:
818                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
819                         local->cooked_mntrs--;
820                         break;
821                 }
822
823                 local->monitors--;
824                 if (local->monitors == 0) {
825                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
826                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
827                         ieee80211_del_virtual_monitor(local);
828                 }
829
830                 ieee80211_adjust_monitor_flags(sdata, -1);
831                 ieee80211_configure_filter(local);
832                 mutex_lock(&local->mtx);
833                 ieee80211_recalc_idle(local);
834                 mutex_unlock(&local->mtx);
835                 break;
836         case NL80211_IFTYPE_P2P_DEVICE:
837                 /* relies on synchronize_rcu() below */
838                 rcu_assign_pointer(local->p2p_sdata, NULL);
839                 /* fall through */
840         default:
841                 cancel_work_sync(&sdata->work);
842                 /*
843                  * When we get here, the interface is marked down.
844                  *
845                  * sta_info_flush_cleanup() requires rcu_barrier()
846                  * first to wait for the station call_rcu() calls
847                  * to complete, here we need at least sychronize_rcu()
848                  * it to wait for the RX path in case it is using the
849                  * interface and enqueuing frames at this very time on
850                  * another CPU.
851                  */
852                 rcu_barrier();
853                 sta_info_flush_cleanup(sdata);
854
855                 skb_queue_purge(&sdata->skb_queue);
856
857                 /*
858                  * Free all remaining keys, there shouldn't be any,
859                  * except maybe group keys in AP more or WDS?
860                  */
861                 ieee80211_free_keys(sdata);
862
863                 drv_remove_interface_debugfs(local, sdata);
864
865                 if (going_down)
866                         drv_remove_interface(local, sdata);
867         }
868
869         sdata->bss = NULL;
870
871         ieee80211_recalc_ps(local, -1);
872
873         if (local->open_count == 0) {
874                 if (local->ops->napi_poll)
875                         napi_disable(&local->napi);
876                 ieee80211_clear_tx_pending(local);
877                 ieee80211_stop_device(local);
878
879                 /* no reconfiguring after stop! */
880                 hw_reconf_flags = 0;
881         }
882
883         /* do after stop to avoid reconfiguring when we stop anyway */
884         if (hw_reconf_flags)
885                 ieee80211_hw_config(local, hw_reconf_flags);
886
887         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
888         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
889                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
890                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
891                         if (info->control.vif == &sdata->vif) {
892                                 __skb_unlink(skb, &local->pending[i]);
893                                 ieee80211_free_txskb(&local->hw, skb);
894                         }
895                 }
896         }
897         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
898
899         if (local->monitors == local->open_count && local->monitors > 0)
900                 ieee80211_add_virtual_monitor(local);
901 }
902
903 static int ieee80211_stop(struct net_device *dev)
904 {
905         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
906
907         ieee80211_do_stop(sdata, true);
908
909         return 0;
910 }
911
912 static void ieee80211_set_multicast_list(struct net_device *dev)
913 {
914         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
915         struct ieee80211_local *local = sdata->local;
916         int allmulti, promisc, sdata_allmulti, sdata_promisc;
917
918         allmulti = !!(dev->flags & IFF_ALLMULTI);
919         promisc = !!(dev->flags & IFF_PROMISC);
920         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
921         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
922
923         if (allmulti != sdata_allmulti) {
924                 if (dev->flags & IFF_ALLMULTI)
925                         atomic_inc(&local->iff_allmultis);
926                 else
927                         atomic_dec(&local->iff_allmultis);
928                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
929         }
930
931         if (promisc != sdata_promisc) {
932                 if (dev->flags & IFF_PROMISC)
933                         atomic_inc(&local->iff_promiscs);
934                 else
935                         atomic_dec(&local->iff_promiscs);
936                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
937         }
938         spin_lock_bh(&local->filter_lock);
939         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
940         spin_unlock_bh(&local->filter_lock);
941         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
942 }
943
944 /*
945  * Called when the netdev is removed or, by the code below, before
946  * the interface type changes.
947  */
948 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
949 {
950         int flushed;
951         int i;
952
953         /* free extra data */
954         ieee80211_free_keys(sdata);
955
956         ieee80211_debugfs_remove_netdev(sdata);
957
958         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
959                 __skb_queue_purge(&sdata->fragments[i].skb_list);
960         sdata->fragment_next = 0;
961
962         if (ieee80211_vif_is_mesh(&sdata->vif))
963                 mesh_rmc_free(sdata);
964
965         flushed = sta_info_flush(sdata);
966         WARN_ON(flushed);
967 }
968
969 static void ieee80211_uninit(struct net_device *dev)
970 {
971         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
972 }
973
974 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
975                                          struct sk_buff *skb)
976 {
977         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
978 }
979
980 static const struct net_device_ops ieee80211_dataif_ops = {
981         .ndo_open               = ieee80211_open,
982         .ndo_stop               = ieee80211_stop,
983         .ndo_uninit             = ieee80211_uninit,
984         .ndo_start_xmit         = ieee80211_subif_start_xmit,
985         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
986         .ndo_change_mtu         = ieee80211_change_mtu,
987         .ndo_set_mac_address    = ieee80211_change_mac,
988         .ndo_select_queue       = ieee80211_netdev_select_queue,
989 };
990
991 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
992                                           struct sk_buff *skb)
993 {
994         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
995         struct ieee80211_local *local = sdata->local;
996         struct ieee80211_hdr *hdr;
997         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
998
999         if (local->hw.queues < IEEE80211_NUM_ACS)
1000                 return 0;
1001
1002         if (skb->len < 4 ||
1003             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1004                 return 0; /* doesn't matter, frame will be dropped */
1005
1006         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1007
1008         return ieee80211_select_queue_80211(sdata, skb, hdr);
1009 }
1010
1011 static const struct net_device_ops ieee80211_monitorif_ops = {
1012         .ndo_open               = ieee80211_open,
1013         .ndo_stop               = ieee80211_stop,
1014         .ndo_uninit             = ieee80211_uninit,
1015         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1016         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1017         .ndo_change_mtu         = ieee80211_change_mtu,
1018         .ndo_set_mac_address    = eth_mac_addr,
1019         .ndo_select_queue       = ieee80211_monitor_select_queue,
1020 };
1021
1022 static void ieee80211_if_setup(struct net_device *dev)
1023 {
1024         ether_setup(dev);
1025         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1026         dev->netdev_ops = &ieee80211_dataif_ops;
1027         dev->destructor = free_netdev;
1028 }
1029
1030 static void ieee80211_iface_work(struct work_struct *work)
1031 {
1032         struct ieee80211_sub_if_data *sdata =
1033                 container_of(work, struct ieee80211_sub_if_data, work);
1034         struct ieee80211_local *local = sdata->local;
1035         struct sk_buff *skb;
1036         struct sta_info *sta;
1037         struct ieee80211_ra_tid *ra_tid;
1038
1039         if (!ieee80211_sdata_running(sdata))
1040                 return;
1041
1042         if (local->scanning)
1043                 return;
1044
1045         /*
1046          * ieee80211_queue_work() should have picked up most cases,
1047          * here we'll pick the rest.
1048          */
1049         if (WARN(local->suspended,
1050                  "interface work scheduled while going to suspend\n"))
1051                 return;
1052
1053         /* first process frames */
1054         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1055                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1056
1057                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1058                         ra_tid = (void *)&skb->cb;
1059                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1060                                                  ra_tid->tid);
1061                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1062                         ra_tid = (void *)&skb->cb;
1063                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1064                                                 ra_tid->tid);
1065                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1066                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1067                         int len = skb->len;
1068
1069                         mutex_lock(&local->sta_mtx);
1070                         sta = sta_info_get_bss(sdata, mgmt->sa);
1071                         if (sta) {
1072                                 switch (mgmt->u.action.u.addba_req.action_code) {
1073                                 case WLAN_ACTION_ADDBA_REQ:
1074                                         ieee80211_process_addba_request(
1075                                                         local, sta, mgmt, len);
1076                                         break;
1077                                 case WLAN_ACTION_ADDBA_RESP:
1078                                         ieee80211_process_addba_resp(local, sta,
1079                                                                      mgmt, len);
1080                                         break;
1081                                 case WLAN_ACTION_DELBA:
1082                                         ieee80211_process_delba(sdata, sta,
1083                                                                 mgmt, len);
1084                                         break;
1085                                 default:
1086                                         WARN_ON(1);
1087                                         break;
1088                                 }
1089                         }
1090                         mutex_unlock(&local->sta_mtx);
1091                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1092                         struct ieee80211_hdr *hdr = (void *)mgmt;
1093                         /*
1094                          * So the frame isn't mgmt, but frame_control
1095                          * is at the right place anyway, of course, so
1096                          * the if statement is correct.
1097                          *
1098                          * Warn if we have other data frame types here,
1099                          * they must not get here.
1100                          */
1101                         WARN_ON(hdr->frame_control &
1102                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1103                         WARN_ON(!(hdr->seq_ctrl &
1104                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1105                         /*
1106                          * This was a fragment of a frame, received while
1107                          * a block-ack session was active. That cannot be
1108                          * right, so terminate the session.
1109                          */
1110                         mutex_lock(&local->sta_mtx);
1111                         sta = sta_info_get_bss(sdata, mgmt->sa);
1112                         if (sta) {
1113                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1114                                                 IEEE80211_QOS_CTL_TID_MASK;
1115
1116                                 __ieee80211_stop_rx_ba_session(
1117                                         sta, tid, WLAN_BACK_RECIPIENT,
1118                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1119                                         true);
1120                         }
1121                         mutex_unlock(&local->sta_mtx);
1122                 } else switch (sdata->vif.type) {
1123                 case NL80211_IFTYPE_STATION:
1124                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1125                         break;
1126                 case NL80211_IFTYPE_ADHOC:
1127                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1128                         break;
1129                 case NL80211_IFTYPE_MESH_POINT:
1130                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1131                                 break;
1132                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1133                         break;
1134                 default:
1135                         WARN(1, "frame for unexpected interface type");
1136                         break;
1137                 }
1138
1139                 kfree_skb(skb);
1140         }
1141
1142         /* then other type-dependent work */
1143         switch (sdata->vif.type) {
1144         case NL80211_IFTYPE_STATION:
1145                 ieee80211_sta_work(sdata);
1146                 break;
1147         case NL80211_IFTYPE_ADHOC:
1148                 ieee80211_ibss_work(sdata);
1149                 break;
1150         case NL80211_IFTYPE_MESH_POINT:
1151                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1152                         break;
1153                 ieee80211_mesh_work(sdata);
1154                 break;
1155         default:
1156                 break;
1157         }
1158 }
1159
1160 static void ieee80211_recalc_smps_work(struct work_struct *work)
1161 {
1162         struct ieee80211_sub_if_data *sdata =
1163                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1164
1165         ieee80211_recalc_smps(sdata);
1166 }
1167
1168 /*
1169  * Helper function to initialise an interface to a specific type.
1170  */
1171 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1172                                   enum nl80211_iftype type)
1173 {
1174         /* clear type-dependent union */
1175         memset(&sdata->u, 0, sizeof(sdata->u));
1176
1177         /* and set some type-dependent values */
1178         sdata->vif.type = type;
1179         sdata->vif.p2p = false;
1180         sdata->wdev.iftype = type;
1181
1182         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1183         sdata->control_port_no_encrypt = false;
1184
1185         sdata->noack_map = 0;
1186
1187         /* only monitor/p2p-device differ */
1188         if (sdata->dev) {
1189                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1190                 sdata->dev->type = ARPHRD_ETHER;
1191         }
1192
1193         skb_queue_head_init(&sdata->skb_queue);
1194         INIT_WORK(&sdata->work, ieee80211_iface_work);
1195         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1196
1197         switch (type) {
1198         case NL80211_IFTYPE_P2P_GO:
1199                 type = NL80211_IFTYPE_AP;
1200                 sdata->vif.type = type;
1201                 sdata->vif.p2p = true;
1202                 /* fall through */
1203         case NL80211_IFTYPE_AP:
1204                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1205                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1206                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1207                 break;
1208         case NL80211_IFTYPE_P2P_CLIENT:
1209                 type = NL80211_IFTYPE_STATION;
1210                 sdata->vif.type = type;
1211                 sdata->vif.p2p = true;
1212                 /* fall through */
1213         case NL80211_IFTYPE_STATION:
1214                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1215                 ieee80211_sta_setup_sdata(sdata);
1216                 break;
1217         case NL80211_IFTYPE_ADHOC:
1218                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1219                 ieee80211_ibss_setup_sdata(sdata);
1220                 break;
1221         case NL80211_IFTYPE_MESH_POINT:
1222                 if (ieee80211_vif_is_mesh(&sdata->vif))
1223                         ieee80211_mesh_init_sdata(sdata);
1224                 break;
1225         case NL80211_IFTYPE_MONITOR:
1226                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1227                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1228                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1229                                       MONITOR_FLAG_OTHER_BSS;
1230                 break;
1231         case NL80211_IFTYPE_WDS:
1232                 sdata->vif.bss_conf.bssid = NULL;
1233                 break;
1234         case NL80211_IFTYPE_AP_VLAN:
1235                 break;
1236         case NL80211_IFTYPE_P2P_DEVICE:
1237                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1238                 break;
1239         case NL80211_IFTYPE_UNSPECIFIED:
1240         case NUM_NL80211_IFTYPES:
1241                 BUG();
1242                 break;
1243         }
1244
1245         ieee80211_debugfs_add_netdev(sdata);
1246 }
1247
1248 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1249                                            enum nl80211_iftype type)
1250 {
1251         struct ieee80211_local *local = sdata->local;
1252         int ret, err;
1253         enum nl80211_iftype internal_type = type;
1254         bool p2p = false;
1255
1256         ASSERT_RTNL();
1257
1258         if (!local->ops->change_interface)
1259                 return -EBUSY;
1260
1261         switch (sdata->vif.type) {
1262         case NL80211_IFTYPE_AP:
1263         case NL80211_IFTYPE_STATION:
1264         case NL80211_IFTYPE_ADHOC:
1265                 /*
1266                  * Could maybe also all others here?
1267                  * Just not sure how that interacts
1268                  * with the RX/config path e.g. for
1269                  * mesh.
1270                  */
1271                 break;
1272         default:
1273                 return -EBUSY;
1274         }
1275
1276         switch (type) {
1277         case NL80211_IFTYPE_AP:
1278         case NL80211_IFTYPE_STATION:
1279         case NL80211_IFTYPE_ADHOC:
1280                 /*
1281                  * Could probably support everything
1282                  * but WDS here (WDS do_open can fail
1283                  * under memory pressure, which this
1284                  * code isn't prepared to handle).
1285                  */
1286                 break;
1287         case NL80211_IFTYPE_P2P_CLIENT:
1288                 p2p = true;
1289                 internal_type = NL80211_IFTYPE_STATION;
1290                 break;
1291         case NL80211_IFTYPE_P2P_GO:
1292                 p2p = true;
1293                 internal_type = NL80211_IFTYPE_AP;
1294                 break;
1295         default:
1296                 return -EBUSY;
1297         }
1298
1299         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1300         if (ret)
1301                 return ret;
1302
1303         ieee80211_do_stop(sdata, false);
1304
1305         ieee80211_teardown_sdata(sdata);
1306
1307         ret = drv_change_interface(local, sdata, internal_type, p2p);
1308         if (ret)
1309                 type = sdata->vif.type;
1310
1311         /*
1312          * Ignore return value here, there's not much we can do since
1313          * the driver changed the interface type internally already.
1314          * The warnings will hopefully make driver authors fix it :-)
1315          */
1316         ieee80211_check_queues(sdata);
1317
1318         ieee80211_setup_sdata(sdata, type);
1319
1320         err = ieee80211_do_open(&sdata->wdev, false);
1321         WARN(err, "type change: do_open returned %d", err);
1322
1323         return ret;
1324 }
1325
1326 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1327                              enum nl80211_iftype type)
1328 {
1329         int ret;
1330
1331         ASSERT_RTNL();
1332
1333         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1334                 return 0;
1335
1336         if (ieee80211_sdata_running(sdata)) {
1337                 ret = ieee80211_runtime_change_iftype(sdata, type);
1338                 if (ret)
1339                         return ret;
1340         } else {
1341                 /* Purge and reset type-dependent state. */
1342                 ieee80211_teardown_sdata(sdata);
1343                 ieee80211_setup_sdata(sdata, type);
1344         }
1345
1346         /* reset some values that shouldn't be kept across type changes */
1347         sdata->drop_unencrypted = 0;
1348         if (type == NL80211_IFTYPE_STATION)
1349                 sdata->u.mgd.use_4addr = false;
1350
1351         return 0;
1352 }
1353
1354 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1355                                        u8 *perm_addr, enum nl80211_iftype type)
1356 {
1357         struct ieee80211_sub_if_data *sdata;
1358         u64 mask, start, addr, val, inc;
1359         u8 *m;
1360         u8 tmp_addr[ETH_ALEN];
1361         int i;
1362
1363         /* default ... something at least */
1364         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1365
1366         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1367             local->hw.wiphy->n_addresses <= 1)
1368                 return;
1369
1370         mutex_lock(&local->iflist_mtx);
1371
1372         switch (type) {
1373         case NL80211_IFTYPE_MONITOR:
1374                 /* doesn't matter */
1375                 break;
1376         case NL80211_IFTYPE_WDS:
1377         case NL80211_IFTYPE_AP_VLAN:
1378                 /* match up with an AP interface */
1379                 list_for_each_entry(sdata, &local->interfaces, list) {
1380                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1381                                 continue;
1382                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1383                         break;
1384                 }
1385                 /* keep default if no AP interface present */
1386                 break;
1387         case NL80211_IFTYPE_P2P_CLIENT:
1388         case NL80211_IFTYPE_P2P_GO:
1389                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1390                         list_for_each_entry(sdata, &local->interfaces, list) {
1391                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1392                                         continue;
1393                                 if (!ieee80211_sdata_running(sdata))
1394                                         continue;
1395                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1396                                 goto out_unlock;
1397                         }
1398                 }
1399                 /* otherwise fall through */
1400         default:
1401                 /* assign a new address if possible -- try n_addresses first */
1402                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1403                         bool used = false;
1404
1405                         list_for_each_entry(sdata, &local->interfaces, list) {
1406                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1407                                            sdata->vif.addr, ETH_ALEN) == 0) {
1408                                         used = true;
1409                                         break;
1410                                 }
1411                         }
1412
1413                         if (!used) {
1414                                 memcpy(perm_addr,
1415                                        local->hw.wiphy->addresses[i].addr,
1416                                        ETH_ALEN);
1417                                 break;
1418                         }
1419                 }
1420
1421                 /* try mask if available */
1422                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1423                         break;
1424
1425                 m = local->hw.wiphy->addr_mask;
1426                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1427                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1428                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1429
1430                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1431                         /* not a contiguous mask ... not handled now! */
1432                         pr_info("not contiguous\n");
1433                         break;
1434                 }
1435
1436                 m = local->hw.wiphy->perm_addr;
1437                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1438                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1439                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1440
1441                 inc = 1ULL<<__ffs64(mask);
1442                 val = (start & mask);
1443                 addr = (start & ~mask) | (val & mask);
1444                 do {
1445                         bool used = false;
1446
1447                         tmp_addr[5] = addr >> 0*8;
1448                         tmp_addr[4] = addr >> 1*8;
1449                         tmp_addr[3] = addr >> 2*8;
1450                         tmp_addr[2] = addr >> 3*8;
1451                         tmp_addr[1] = addr >> 4*8;
1452                         tmp_addr[0] = addr >> 5*8;
1453
1454                         val += inc;
1455
1456                         list_for_each_entry(sdata, &local->interfaces, list) {
1457                                 if (memcmp(tmp_addr, sdata->vif.addr,
1458                                                         ETH_ALEN) == 0) {
1459                                         used = true;
1460                                         break;
1461                                 }
1462                         }
1463
1464                         if (!used) {
1465                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1466                                 break;
1467                         }
1468                         addr = (start & ~mask) | (val & mask);
1469                 } while (addr != start);
1470
1471                 break;
1472         }
1473
1474  out_unlock:
1475         mutex_unlock(&local->iflist_mtx);
1476 }
1477
1478 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1479 {
1480         struct ieee80211_sub_if_data *sdata;
1481
1482         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1483
1484         ieee80211_cleanup_sdata_stas(sdata);
1485 }
1486
1487 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1488                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1489                      struct vif_params *params)
1490 {
1491         struct net_device *ndev = NULL;
1492         struct ieee80211_sub_if_data *sdata = NULL;
1493         int ret, i;
1494         int txqs = 1;
1495
1496         ASSERT_RTNL();
1497
1498         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1499                 struct wireless_dev *wdev;
1500
1501                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1502                                 GFP_KERNEL);
1503                 if (!sdata)
1504                         return -ENOMEM;
1505                 wdev = &sdata->wdev;
1506
1507                 sdata->dev = NULL;
1508                 strlcpy(sdata->name, name, IFNAMSIZ);
1509                 ieee80211_assign_perm_addr(local, wdev->address, type);
1510                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1511         } else {
1512                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1513                         txqs = IEEE80211_NUM_ACS;
1514
1515                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1516                                         local->hw.vif_data_size,
1517                                         name, ieee80211_if_setup, txqs, 1);
1518                 if (!ndev)
1519                         return -ENOMEM;
1520                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1521
1522                 ndev->needed_headroom = local->tx_headroom +
1523                                         4*6 /* four MAC addresses */
1524                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1525                                         + 6 /* mesh */
1526                                         + 8 /* rfc1042/bridge tunnel */
1527                                         - ETH_HLEN /* ethernet hard_header_len */
1528                                         + IEEE80211_ENCRYPT_HEADROOM;
1529                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1530
1531                 ret = dev_alloc_name(ndev, ndev->name);
1532                 if (ret < 0) {
1533                         free_netdev(ndev);
1534                         return ret;
1535                 }
1536
1537                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1538                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1539                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1540
1541                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1542                 sdata = netdev_priv(ndev);
1543                 ndev->ieee80211_ptr = &sdata->wdev;
1544                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1545                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1546
1547                 sdata->dev = ndev;
1548         }
1549
1550         /* initialise type-independent data */
1551         sdata->wdev.wiphy = local->hw.wiphy;
1552         sdata->local = local;
1553
1554         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1555                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1556
1557         INIT_LIST_HEAD(&sdata->key_list);
1558
1559         spin_lock_init(&sdata->cleanup_stations_lock);
1560         INIT_LIST_HEAD(&sdata->cleanup_stations);
1561         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1562         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1563                           ieee80211_dfs_cac_timer_work);
1564
1565         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1566                 struct ieee80211_supported_band *sband;
1567                 sband = local->hw.wiphy->bands[i];
1568                 sdata->rc_rateidx_mask[i] =
1569                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1570                 if (sband)
1571                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1572                                sband->ht_cap.mcs.rx_mask,
1573                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1574                 else
1575                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1576                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1577         }
1578
1579         ieee80211_set_default_queues(sdata);
1580
1581         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1582         sdata->user_power_level = local->user_power_level;
1583
1584         /* setup type-dependent data */
1585         ieee80211_setup_sdata(sdata, type);
1586
1587         if (ndev) {
1588                 if (params) {
1589                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1590                         if (type == NL80211_IFTYPE_STATION)
1591                                 sdata->u.mgd.use_4addr = params->use_4addr;
1592                 }
1593
1594                 ndev->features |= local->hw.netdev_features;
1595
1596                 ret = register_netdevice(ndev);
1597                 if (ret) {
1598                         free_netdev(ndev);
1599                         return ret;
1600                 }
1601         }
1602
1603         mutex_lock(&local->iflist_mtx);
1604         list_add_tail_rcu(&sdata->list, &local->interfaces);
1605         mutex_unlock(&local->iflist_mtx);
1606
1607         if (new_wdev)
1608                 *new_wdev = &sdata->wdev;
1609
1610         return 0;
1611 }
1612
1613 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1614 {
1615         ASSERT_RTNL();
1616
1617         mutex_lock(&sdata->local->iflist_mtx);
1618         list_del_rcu(&sdata->list);
1619         mutex_unlock(&sdata->local->iflist_mtx);
1620
1621         synchronize_rcu();
1622
1623         if (sdata->dev) {
1624                 unregister_netdevice(sdata->dev);
1625         } else {
1626                 cfg80211_unregister_wdev(&sdata->wdev);
1627                 kfree(sdata);
1628         }
1629 }
1630
1631 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1632 {
1633         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1634                 return;
1635         ieee80211_do_stop(sdata, true);
1636         ieee80211_teardown_sdata(sdata);
1637 }
1638
1639 /*
1640  * Remove all interfaces, may only be called at hardware unregistration
1641  * time because it doesn't do RCU-safe list removals.
1642  */
1643 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1644 {
1645         struct ieee80211_sub_if_data *sdata, *tmp;
1646         LIST_HEAD(unreg_list);
1647         LIST_HEAD(wdev_list);
1648
1649         ASSERT_RTNL();
1650
1651         mutex_lock(&local->iflist_mtx);
1652         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1653                 list_del(&sdata->list);
1654
1655                 if (sdata->dev)
1656                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1657                 else
1658                         list_add(&sdata->list, &wdev_list);
1659         }
1660         mutex_unlock(&local->iflist_mtx);
1661         unregister_netdevice_many(&unreg_list);
1662         list_del(&unreg_list);
1663
1664         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1665                 list_del(&sdata->list);
1666                 cfg80211_unregister_wdev(&sdata->wdev);
1667                 kfree(sdata);
1668         }
1669 }
1670
1671 static int netdev_notify(struct notifier_block *nb,
1672                          unsigned long state,
1673                          void *ndev)
1674 {
1675         struct net_device *dev = ndev;
1676         struct ieee80211_sub_if_data *sdata;
1677
1678         if (state != NETDEV_CHANGENAME)
1679                 return 0;
1680
1681         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1682                 return 0;
1683
1684         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1685                 return 0;
1686
1687         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1688
1689         memcpy(sdata->name, dev->name, IFNAMSIZ);
1690
1691         ieee80211_debugfs_rename_netdev(sdata);
1692         return 0;
1693 }
1694
1695 static struct notifier_block mac80211_netdev_notifier = {
1696         .notifier_call = netdev_notify,
1697 };
1698
1699 int ieee80211_iface_init(void)
1700 {
1701         return register_netdevice_notifier(&mac80211_netdev_notifier);
1702 }
1703
1704 void ieee80211_iface_exit(void)
1705 {
1706         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1707 }