514e90f470bf654abf6f6279cf8dbc16284e0ef9
[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 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_sub_if_data *sdata, u8 *addr)
163 {
164         struct ieee80211_local *local = sdata->local;
165         struct ieee80211_sub_if_data *iter;
166         u64 new, mask, tmp;
167         u8 *m;
168         int ret = 0;
169
170         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
171                 return 0;
172
173         m = addr;
174         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
175                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
176                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
177
178         m = local->hw.wiphy->addr_mask;
179         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
180                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
181                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
182
183
184         mutex_lock(&local->iflist_mtx);
185         list_for_each_entry(iter, &local->interfaces, list) {
186                 if (iter == sdata)
187                         continue;
188
189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR)
190                         continue;
191
192                 m = iter->vif.addr;
193                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
194                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
195                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
196
197                 if ((new & ~mask) != (tmp & ~mask)) {
198                         ret = -EINVAL;
199                         break;
200                 }
201         }
202         mutex_unlock(&local->iflist_mtx);
203
204         return ret;
205 }
206
207 static int ieee80211_change_mac(struct net_device *dev, void *addr)
208 {
209         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
210         struct sockaddr *sa = addr;
211         int ret;
212
213         if (ieee80211_sdata_running(sdata))
214                 return -EBUSY;
215
216         ret = ieee80211_verify_mac(sdata, sa->sa_data);
217         if (ret)
218                 return ret;
219
220         ret = eth_mac_addr(dev, sa);
221
222         if (ret == 0)
223                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
224
225         return ret;
226 }
227
228 static inline int identical_mac_addr_allowed(int type1, int type2)
229 {
230         return type1 == NL80211_IFTYPE_MONITOR ||
231                 type2 == NL80211_IFTYPE_MONITOR ||
232                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
233                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
235                 (type1 == NL80211_IFTYPE_WDS &&
236                         (type2 == NL80211_IFTYPE_WDS ||
237                          type2 == NL80211_IFTYPE_AP)) ||
238                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
239                 (type1 == NL80211_IFTYPE_AP_VLAN &&
240                         (type2 == NL80211_IFTYPE_AP ||
241                          type2 == NL80211_IFTYPE_AP_VLAN));
242 }
243
244 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
245                                             enum nl80211_iftype iftype)
246 {
247         struct ieee80211_local *local = sdata->local;
248         struct ieee80211_sub_if_data *nsdata;
249
250         ASSERT_RTNL();
251
252         /* we hold the RTNL here so can safely walk the list */
253         list_for_each_entry(nsdata, &local->interfaces, list) {
254                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
255                         /*
256                          * Allow only a single IBSS interface to be up at any
257                          * time. This is restricted because beacon distribution
258                          * cannot work properly if both are in the same IBSS.
259                          *
260                          * To remove this restriction we'd have to disallow them
261                          * from setting the same SSID on different IBSS interfaces
262                          * belonging to the same hardware. Then, however, we're
263                          * faced with having to adopt two different TSF timers...
264                          */
265                         if (iftype == NL80211_IFTYPE_ADHOC &&
266                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
267                                 return -EBUSY;
268
269                         /*
270                          * The remaining checks are only performed for interfaces
271                          * with the same MAC address.
272                          */
273                         if (!ether_addr_equal(sdata->vif.addr,
274                                               nsdata->vif.addr))
275                                 continue;
276
277                         /*
278                          * check whether it may have the same address
279                          */
280                         if (!identical_mac_addr_allowed(iftype,
281                                                         nsdata->vif.type))
282                                 return -ENOTUNIQ;
283
284                         /*
285                          * can only add VLANs to enabled APs
286                          */
287                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
288                             nsdata->vif.type == NL80211_IFTYPE_AP)
289                                 sdata->bss = &nsdata->u.ap;
290                 }
291         }
292
293         return 0;
294 }
295
296 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
297 {
298         int n_queues = sdata->local->hw.queues;
299         int i;
300
301         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
302                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
303                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
304                                          IEEE80211_INVAL_HW_QUEUE))
305                                 return -EINVAL;
306                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
307                                          n_queues))
308                                 return -EINVAL;
309                 }
310         }
311
312         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
313              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
314             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
315                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
316                 return 0;
317         }
318
319         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
320                 return -EINVAL;
321
322         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
323                 return -EINVAL;
324
325         return 0;
326 }
327
328 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
329                                     const int offset)
330 {
331         struct ieee80211_local *local = sdata->local;
332         u32 flags = sdata->u.mntr_flags;
333
334 #define ADJUST(_f, _s)  do {                                    \
335         if (flags & MONITOR_FLAG_##_f)                          \
336                 local->fif_##_s += offset;                      \
337         } while (0)
338
339         ADJUST(FCSFAIL, fcsfail);
340         ADJUST(PLCPFAIL, plcpfail);
341         ADJUST(CONTROL, control);
342         ADJUST(CONTROL, pspoll);
343         ADJUST(OTHER_BSS, other_bss);
344
345 #undef ADJUST
346 }
347
348 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
349 {
350         struct ieee80211_local *local = sdata->local;
351         int i;
352
353         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
354                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
355                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
356                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
357                         sdata->vif.hw_queue[i] = i;
358                 else
359                         sdata->vif.hw_queue[i] = 0;
360         }
361         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
362 }
363
364 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
365 {
366         struct ieee80211_sub_if_data *sdata;
367         int ret;
368
369         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
370                 return 0;
371
372         ASSERT_RTNL();
373
374         if (local->monitor_sdata)
375                 return 0;
376
377         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
378         if (!sdata)
379                 return -ENOMEM;
380
381         /* set up data */
382         sdata->local = local;
383         sdata->vif.type = NL80211_IFTYPE_MONITOR;
384         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
385                  wiphy_name(local->hw.wiphy));
386
387         ieee80211_set_default_queues(sdata);
388
389         ret = drv_add_interface(local, sdata);
390         if (WARN_ON(ret)) {
391                 /* ok .. stupid driver, it asked for this! */
392                 kfree(sdata);
393                 return ret;
394         }
395
396         ret = ieee80211_check_queues(sdata);
397         if (ret) {
398                 kfree(sdata);
399                 return ret;
400         }
401
402         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
403                                         IEEE80211_CHANCTX_EXCLUSIVE);
404         if (ret) {
405                 drv_remove_interface(local, sdata);
406                 kfree(sdata);
407                 return ret;
408         }
409
410         mutex_lock(&local->iflist_mtx);
411         rcu_assign_pointer(local->monitor_sdata, sdata);
412         mutex_unlock(&local->iflist_mtx);
413
414         return 0;
415 }
416
417 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
418 {
419         struct ieee80211_sub_if_data *sdata;
420
421         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
422                 return;
423
424         ASSERT_RTNL();
425
426         mutex_lock(&local->iflist_mtx);
427
428         sdata = rcu_dereference_protected(local->monitor_sdata,
429                                           lockdep_is_held(&local->iflist_mtx));
430         if (!sdata) {
431                 mutex_unlock(&local->iflist_mtx);
432                 return;
433         }
434
435         rcu_assign_pointer(local->monitor_sdata, NULL);
436         mutex_unlock(&local->iflist_mtx);
437
438         synchronize_net();
439
440         ieee80211_vif_release_channel(sdata);
441
442         drv_remove_interface(local, sdata);
443
444         kfree(sdata);
445 }
446
447 /*
448  * NOTE: Be very careful when changing this function, it must NOT return
449  * an error on interface type changes that have been pre-checked, so most
450  * checks should be in ieee80211_check_concurrent_iface.
451  */
452 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
453 {
454         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
455         struct net_device *dev = wdev->netdev;
456         struct ieee80211_local *local = sdata->local;
457         struct sta_info *sta;
458         u32 changed = 0;
459         int res;
460         u32 hw_reconf_flags = 0;
461
462         switch (sdata->vif.type) {
463         case NL80211_IFTYPE_WDS:
464                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
465                         return -ENOLINK;
466                 break;
467         case NL80211_IFTYPE_AP_VLAN: {
468                 struct ieee80211_sub_if_data *master;
469
470                 if (!sdata->bss)
471                         return -ENOLINK;
472
473                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
474
475                 master = container_of(sdata->bss,
476                                       struct ieee80211_sub_if_data, u.ap);
477                 sdata->control_port_protocol =
478                         master->control_port_protocol;
479                 sdata->control_port_no_encrypt =
480                         master->control_port_no_encrypt;
481                 sdata->vif.cab_queue = master->vif.cab_queue;
482                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
483                        sizeof(sdata->vif.hw_queue));
484                 break;
485                 }
486         case NL80211_IFTYPE_AP:
487                 sdata->bss = &sdata->u.ap;
488                 break;
489         case NL80211_IFTYPE_MESH_POINT:
490         case NL80211_IFTYPE_STATION:
491         case NL80211_IFTYPE_MONITOR:
492         case NL80211_IFTYPE_ADHOC:
493         case NL80211_IFTYPE_P2P_DEVICE:
494                 /* no special treatment */
495                 break;
496         case NL80211_IFTYPE_UNSPECIFIED:
497         case NUM_NL80211_IFTYPES:
498         case NL80211_IFTYPE_P2P_CLIENT:
499         case NL80211_IFTYPE_P2P_GO:
500                 /* cannot happen */
501                 WARN_ON(1);
502                 break;
503         }
504
505         if (local->open_count == 0) {
506                 res = drv_start(local);
507                 if (res)
508                         goto err_del_bss;
509                 /* we're brought up, everything changes */
510                 hw_reconf_flags = ~0;
511                 ieee80211_led_radio(local, true);
512                 ieee80211_mod_tpt_led_trig(local,
513                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
514         }
515
516         /*
517          * Copy the hopefully now-present MAC address to
518          * this interface, if it has the special null one.
519          */
520         if (dev && is_zero_ether_addr(dev->dev_addr)) {
521                 memcpy(dev->dev_addr,
522                        local->hw.wiphy->perm_addr,
523                        ETH_ALEN);
524                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
525
526                 if (!is_valid_ether_addr(dev->dev_addr)) {
527                         res = -EADDRNOTAVAIL;
528                         goto err_stop;
529                 }
530         }
531
532         switch (sdata->vif.type) {
533         case NL80211_IFTYPE_AP_VLAN:
534                 /* no need to tell driver, but set carrier and chanctx */
535                 if (rtnl_dereference(sdata->bss->beacon)) {
536                         ieee80211_vif_vlan_copy_chanctx(sdata);
537                         netif_carrier_on(dev);
538                 } else {
539                         netif_carrier_off(dev);
540                 }
541                 break;
542         case NL80211_IFTYPE_MONITOR:
543                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
544                         local->cooked_mntrs++;
545                         break;
546                 }
547
548                 if (local->monitors == 0 && local->open_count == 0) {
549                         res = ieee80211_add_virtual_monitor(local);
550                         if (res)
551                                 goto err_stop;
552                 }
553
554                 /* must be before the call to ieee80211_configure_filter */
555                 local->monitors++;
556                 if (local->monitors == 1) {
557                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
558                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
559                 }
560
561                 ieee80211_adjust_monitor_flags(sdata, 1);
562                 ieee80211_configure_filter(local);
563                 mutex_lock(&local->mtx);
564                 ieee80211_recalc_idle(local);
565                 mutex_unlock(&local->mtx);
566
567                 netif_carrier_on(dev);
568                 break;
569         default:
570                 if (coming_up) {
571                         ieee80211_del_virtual_monitor(local);
572
573                         res = drv_add_interface(local, sdata);
574                         if (res)
575                                 goto err_stop;
576                         res = ieee80211_check_queues(sdata);
577                         if (res)
578                                 goto err_del_interface;
579                 }
580
581                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
582                         local->fif_pspoll++;
583                         local->fif_probe_req++;
584
585                         ieee80211_configure_filter(local);
586                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
587                         local->fif_probe_req++;
588                 }
589
590                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
591                         changed |= ieee80211_reset_erp_info(sdata);
592                 ieee80211_bss_info_change_notify(sdata, changed);
593
594                 switch (sdata->vif.type) {
595                 case NL80211_IFTYPE_STATION:
596                 case NL80211_IFTYPE_ADHOC:
597                 case NL80211_IFTYPE_AP:
598                 case NL80211_IFTYPE_MESH_POINT:
599                         netif_carrier_off(dev);
600                         break;
601                 case NL80211_IFTYPE_WDS:
602                 case NL80211_IFTYPE_P2P_DEVICE:
603                         break;
604                 default:
605                         /* not reached */
606                         WARN_ON(1);
607                 }
608
609                 /*
610                  * set default queue parameters so drivers don't
611                  * need to initialise the hardware if the hardware
612                  * doesn't start up with sane defaults
613                  */
614                 ieee80211_set_wmm_default(sdata, true);
615         }
616
617         set_bit(SDATA_STATE_RUNNING, &sdata->state);
618
619         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
620                 /* Create STA entry for the WDS peer */
621                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
622                                      GFP_KERNEL);
623                 if (!sta) {
624                         res = -ENOMEM;
625                         goto err_del_interface;
626                 }
627
628                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
629                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
630                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
631
632                 res = sta_info_insert(sta);
633                 if (res) {
634                         /* STA has been freed */
635                         goto err_del_interface;
636                 }
637
638                 rate_control_rate_init(sta);
639                 netif_carrier_on(dev);
640         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
641                 rcu_assign_pointer(local->p2p_sdata, sdata);
642         }
643
644         /*
645          * set_multicast_list will be invoked by the networking core
646          * which will check whether any increments here were done in
647          * error and sync them down to the hardware as filter flags.
648          */
649         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
650                 atomic_inc(&local->iff_allmultis);
651
652         if (sdata->flags & IEEE80211_SDATA_PROMISC)
653                 atomic_inc(&local->iff_promiscs);
654
655         if (coming_up)
656                 local->open_count++;
657
658         if (hw_reconf_flags)
659                 ieee80211_hw_config(local, hw_reconf_flags);
660
661         ieee80211_recalc_ps(local, -1);
662
663         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
664             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
665                 /* XXX: for AP_VLAN, actually track AP queues */
666                 netif_tx_start_all_queues(dev);
667         } else if (dev) {
668                 unsigned long flags;
669                 int n_acs = IEEE80211_NUM_ACS;
670                 int ac;
671
672                 if (local->hw.queues < IEEE80211_NUM_ACS)
673                         n_acs = 1;
674
675                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
676                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
677                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
678                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
679                         for (ac = 0; ac < n_acs; ac++) {
680                                 int ac_queue = sdata->vif.hw_queue[ac];
681
682                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
683                                     skb_queue_empty(&local->pending[ac_queue]))
684                                         netif_start_subqueue(dev, ac);
685                         }
686                 }
687                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
688         }
689
690         return 0;
691  err_del_interface:
692         drv_remove_interface(local, sdata);
693  err_stop:
694         if (!local->open_count)
695                 drv_stop(local);
696  err_del_bss:
697         sdata->bss = NULL;
698         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
699                 list_del(&sdata->u.vlan.list);
700         /* might already be clear but that doesn't matter */
701         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
702         return res;
703 }
704
705 static int ieee80211_open(struct net_device *dev)
706 {
707         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
708         int err;
709
710         /* fail early if user set an invalid address */
711         if (!is_valid_ether_addr(dev->dev_addr))
712                 return -EADDRNOTAVAIL;
713
714         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
715         if (err)
716                 return err;
717
718         return ieee80211_do_open(&sdata->wdev, true);
719 }
720
721 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
722                               bool going_down)
723 {
724         struct ieee80211_local *local = sdata->local;
725         unsigned long flags;
726         struct sk_buff *skb, *tmp;
727         u32 hw_reconf_flags = 0;
728         int i, flushed;
729         struct ps_data *ps;
730
731         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
732
733         if (rcu_access_pointer(local->scan_sdata) == sdata)
734                 ieee80211_scan_cancel(local);
735
736         /*
737          * Stop TX on this interface first.
738          */
739         if (sdata->dev)
740                 netif_tx_stop_all_queues(sdata->dev);
741
742         ieee80211_roc_purge(local, sdata);
743
744         if (sdata->vif.type == NL80211_IFTYPE_STATION)
745                 ieee80211_mgd_stop(sdata);
746
747         /*
748          * Remove all stations associated with this interface.
749          *
750          * This must be done before calling ops->remove_interface()
751          * because otherwise we can later invoke ops->sta_notify()
752          * whenever the STAs are removed, and that invalidates driver
753          * assumptions about always getting a vif pointer that is valid
754          * (because if we remove a STA after ops->remove_interface()
755          * the driver will have removed the vif info already!)
756          *
757          * This is relevant only in WDS mode, in all other modes we've
758          * already removed all stations when disconnecting or similar,
759          * so warn otherwise.
760          *
761          * We call sta_info_flush_cleanup() later, to combine RCU waits.
762          */
763         flushed = sta_info_flush_defer(sdata);
764         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
765                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
766
767         /* don't count this interface for promisc/allmulti while it is down */
768         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
769                 atomic_dec(&local->iff_allmultis);
770
771         if (sdata->flags & IEEE80211_SDATA_PROMISC)
772                 atomic_dec(&local->iff_promiscs);
773
774         if (sdata->vif.type == NL80211_IFTYPE_AP) {
775                 local->fif_pspoll--;
776                 local->fif_probe_req--;
777         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
778                 local->fif_probe_req--;
779         }
780
781         if (sdata->dev) {
782                 netif_addr_lock_bh(sdata->dev);
783                 spin_lock_bh(&local->filter_lock);
784                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
785                                  sdata->dev->addr_len);
786                 spin_unlock_bh(&local->filter_lock);
787                 netif_addr_unlock_bh(sdata->dev);
788         }
789
790         del_timer_sync(&local->dynamic_ps_timer);
791         cancel_work_sync(&local->dynamic_ps_enable_work);
792
793         cancel_work_sync(&sdata->recalc_smps);
794
795         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
796
797         if (sdata->wdev.cac_started) {
798                 WARN_ON(local->suspended);
799                 mutex_lock(&local->iflist_mtx);
800                 ieee80211_vif_release_channel(sdata);
801                 mutex_unlock(&local->iflist_mtx);
802                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
803                                    GFP_KERNEL);
804         }
805
806         /* APs need special treatment */
807         if (sdata->vif.type == NL80211_IFTYPE_AP) {
808                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
809
810                 /* down all dependent devices, that is VLANs */
811                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
812                                          u.vlan.list)
813                         dev_close(vlan->dev);
814                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
815         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
816                 /* remove all packets in parent bc_buf pointing to this dev */
817                 ps = &sdata->bss->ps;
818
819                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
820                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
821                         if (skb->dev == sdata->dev) {
822                                 __skb_unlink(skb, &ps->bc_buf);
823                                 local->total_ps_buffered--;
824                                 ieee80211_free_txskb(&local->hw, skb);
825                         }
826                 }
827                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
828         }
829
830         if (going_down)
831                 local->open_count--;
832
833         switch (sdata->vif.type) {
834         case NL80211_IFTYPE_AP_VLAN:
835                 list_del(&sdata->u.vlan.list);
836                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
837                 /* no need to tell driver */
838                 break;
839         case NL80211_IFTYPE_MONITOR:
840                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
841                         local->cooked_mntrs--;
842                         break;
843                 }
844
845                 local->monitors--;
846                 if (local->monitors == 0) {
847                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
848                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
849                 }
850
851                 ieee80211_adjust_monitor_flags(sdata, -1);
852                 break;
853         case NL80211_IFTYPE_P2P_DEVICE:
854                 /* relies on synchronize_rcu() below */
855                 rcu_assign_pointer(local->p2p_sdata, NULL);
856                 /* fall through */
857         default:
858                 cancel_work_sync(&sdata->work);
859                 /*
860                  * When we get here, the interface is marked down.
861                  *
862                  * sta_info_flush_cleanup() requires rcu_barrier()
863                  * first to wait for the station call_rcu() calls
864                  * to complete, and we also need synchronize_rcu()
865                  * to wait for the RX path in case it is using the
866                  * interface and enqueuing frames at this very time on
867                  * another CPU.
868                  */
869                 synchronize_rcu();
870                 rcu_barrier();
871                 sta_info_flush_cleanup(sdata);
872
873                 /*
874                  * Free all remaining keys, there shouldn't be any,
875                  * except maybe in WDS mode?
876                  */
877                 ieee80211_free_keys(sdata);
878
879                 /* fall through */
880         case NL80211_IFTYPE_AP:
881                 skb_queue_purge(&sdata->skb_queue);
882         }
883
884         sdata->bss = NULL;
885
886         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
887         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
888                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
889                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
890                         if (info->control.vif == &sdata->vif) {
891                                 __skb_unlink(skb, &local->pending[i]);
892                                 ieee80211_free_txskb(&local->hw, skb);
893                         }
894                 }
895         }
896         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
897
898         if (local->open_count == 0)
899                 ieee80211_clear_tx_pending(local);
900
901         /*
902          * If the interface goes down while suspended, presumably because
903          * the device was unplugged and that happens before our resume,
904          * then the driver is already unconfigured and the remainder of
905          * this function isn't needed.
906          * XXX: what about WoWLAN? If the device has software state, e.g.
907          *      memory allocated, it might expect teardown commands from
908          *      mac80211 here?
909          */
910         if (local->suspended) {
911                 WARN_ON(local->wowlan);
912                 WARN_ON(rtnl_dereference(local->monitor_sdata));
913                 return;
914         }
915
916         switch (sdata->vif.type) {
917         case NL80211_IFTYPE_AP_VLAN:
918                 break;
919         case NL80211_IFTYPE_MONITOR:
920                 if (local->monitors == 0)
921                         ieee80211_del_virtual_monitor(local);
922
923                 mutex_lock(&local->mtx);
924                 ieee80211_recalc_idle(local);
925                 mutex_unlock(&local->mtx);
926                 break;
927         default:
928                 if (going_down)
929                         drv_remove_interface(local, sdata);
930         }
931
932         ieee80211_recalc_ps(local, -1);
933
934         if (local->open_count == 0) {
935                 ieee80211_stop_device(local);
936
937                 /* no reconfiguring after stop! */
938                 return;
939         }
940
941         /* do after stop to avoid reconfiguring when we stop anyway */
942         ieee80211_configure_filter(local);
943         ieee80211_hw_config(local, hw_reconf_flags);
944
945         if (local->monitors == local->open_count)
946                 ieee80211_add_virtual_monitor(local);
947 }
948
949 static int ieee80211_stop(struct net_device *dev)
950 {
951         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
952
953         ieee80211_do_stop(sdata, true);
954
955         return 0;
956 }
957
958 static void ieee80211_set_multicast_list(struct net_device *dev)
959 {
960         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
961         struct ieee80211_local *local = sdata->local;
962         int allmulti, promisc, sdata_allmulti, sdata_promisc;
963
964         allmulti = !!(dev->flags & IFF_ALLMULTI);
965         promisc = !!(dev->flags & IFF_PROMISC);
966         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
967         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
968
969         if (allmulti != sdata_allmulti) {
970                 if (dev->flags & IFF_ALLMULTI)
971                         atomic_inc(&local->iff_allmultis);
972                 else
973                         atomic_dec(&local->iff_allmultis);
974                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
975         }
976
977         if (promisc != sdata_promisc) {
978                 if (dev->flags & IFF_PROMISC)
979                         atomic_inc(&local->iff_promiscs);
980                 else
981                         atomic_dec(&local->iff_promiscs);
982                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
983         }
984
985         /*
986          * TODO: If somebody needs this on AP interfaces,
987          *       it can be enabled easily but multicast
988          *       addresses from VLANs need to be synced.
989          */
990         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
991             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
992             sdata->vif.type != NL80211_IFTYPE_AP)
993                 drv_set_multicast_list(local, sdata, &dev->mc);
994
995         spin_lock_bh(&local->filter_lock);
996         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
997         spin_unlock_bh(&local->filter_lock);
998         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
999 }
1000
1001 /*
1002  * Called when the netdev is removed or, by the code below, before
1003  * the interface type changes.
1004  */
1005 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1006 {
1007         int flushed;
1008         int i;
1009
1010         /* free extra data */
1011         ieee80211_free_keys(sdata);
1012
1013         ieee80211_debugfs_remove_netdev(sdata);
1014
1015         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1016                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1017         sdata->fragment_next = 0;
1018
1019         if (ieee80211_vif_is_mesh(&sdata->vif))
1020                 mesh_rmc_free(sdata);
1021
1022         flushed = sta_info_flush(sdata);
1023         WARN_ON(flushed);
1024 }
1025
1026 static void ieee80211_uninit(struct net_device *dev)
1027 {
1028         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1029 }
1030
1031 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1032                                          struct sk_buff *skb)
1033 {
1034         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1035 }
1036
1037 static const struct net_device_ops ieee80211_dataif_ops = {
1038         .ndo_open               = ieee80211_open,
1039         .ndo_stop               = ieee80211_stop,
1040         .ndo_uninit             = ieee80211_uninit,
1041         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1042         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1043         .ndo_change_mtu         = ieee80211_change_mtu,
1044         .ndo_set_mac_address    = ieee80211_change_mac,
1045         .ndo_select_queue       = ieee80211_netdev_select_queue,
1046 };
1047
1048 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1049                                           struct sk_buff *skb)
1050 {
1051         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1052         struct ieee80211_local *local = sdata->local;
1053         struct ieee80211_hdr *hdr;
1054         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1055
1056         if (local->hw.queues < IEEE80211_NUM_ACS)
1057                 return 0;
1058
1059         if (skb->len < 4 ||
1060             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1061                 return 0; /* doesn't matter, frame will be dropped */
1062
1063         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1064
1065         return ieee80211_select_queue_80211(sdata, skb, hdr);
1066 }
1067
1068 static const struct net_device_ops ieee80211_monitorif_ops = {
1069         .ndo_open               = ieee80211_open,
1070         .ndo_stop               = ieee80211_stop,
1071         .ndo_uninit             = ieee80211_uninit,
1072         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1073         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1074         .ndo_change_mtu         = ieee80211_change_mtu,
1075         .ndo_set_mac_address    = eth_mac_addr,
1076         .ndo_select_queue       = ieee80211_monitor_select_queue,
1077 };
1078
1079 static void ieee80211_if_setup(struct net_device *dev)
1080 {
1081         ether_setup(dev);
1082         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1083         dev->netdev_ops = &ieee80211_dataif_ops;
1084         dev->destructor = free_netdev;
1085 }
1086
1087 static void ieee80211_iface_work(struct work_struct *work)
1088 {
1089         struct ieee80211_sub_if_data *sdata =
1090                 container_of(work, struct ieee80211_sub_if_data, work);
1091         struct ieee80211_local *local = sdata->local;
1092         struct sk_buff *skb;
1093         struct sta_info *sta;
1094         struct ieee80211_ra_tid *ra_tid;
1095
1096         if (!ieee80211_sdata_running(sdata))
1097                 return;
1098
1099         if (local->scanning)
1100                 return;
1101
1102         /*
1103          * ieee80211_queue_work() should have picked up most cases,
1104          * here we'll pick the rest.
1105          */
1106         if (WARN(local->suspended,
1107                  "interface work scheduled while going to suspend\n"))
1108                 return;
1109
1110         /* first process frames */
1111         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1112                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1113
1114                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1115                         ra_tid = (void *)&skb->cb;
1116                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1117                                                  ra_tid->tid);
1118                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1119                         ra_tid = (void *)&skb->cb;
1120                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1121                                                 ra_tid->tid);
1122                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1123                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1124                         int len = skb->len;
1125
1126                         mutex_lock(&local->sta_mtx);
1127                         sta = sta_info_get_bss(sdata, mgmt->sa);
1128                         if (sta) {
1129                                 switch (mgmt->u.action.u.addba_req.action_code) {
1130                                 case WLAN_ACTION_ADDBA_REQ:
1131                                         ieee80211_process_addba_request(
1132                                                         local, sta, mgmt, len);
1133                                         break;
1134                                 case WLAN_ACTION_ADDBA_RESP:
1135                                         ieee80211_process_addba_resp(local, sta,
1136                                                                      mgmt, len);
1137                                         break;
1138                                 case WLAN_ACTION_DELBA:
1139                                         ieee80211_process_delba(sdata, sta,
1140                                                                 mgmt, len);
1141                                         break;
1142                                 default:
1143                                         WARN_ON(1);
1144                                         break;
1145                                 }
1146                         }
1147                         mutex_unlock(&local->sta_mtx);
1148                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1149                         struct ieee80211_hdr *hdr = (void *)mgmt;
1150                         /*
1151                          * So the frame isn't mgmt, but frame_control
1152                          * is at the right place anyway, of course, so
1153                          * the if statement is correct.
1154                          *
1155                          * Warn if we have other data frame types here,
1156                          * they must not get here.
1157                          */
1158                         WARN_ON(hdr->frame_control &
1159                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1160                         WARN_ON(!(hdr->seq_ctrl &
1161                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1162                         /*
1163                          * This was a fragment of a frame, received while
1164                          * a block-ack session was active. That cannot be
1165                          * right, so terminate the session.
1166                          */
1167                         mutex_lock(&local->sta_mtx);
1168                         sta = sta_info_get_bss(sdata, mgmt->sa);
1169                         if (sta) {
1170                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1171                                                 IEEE80211_QOS_CTL_TID_MASK;
1172
1173                                 __ieee80211_stop_rx_ba_session(
1174                                         sta, tid, WLAN_BACK_RECIPIENT,
1175                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1176                                         true);
1177                         }
1178                         mutex_unlock(&local->sta_mtx);
1179                 } else switch (sdata->vif.type) {
1180                 case NL80211_IFTYPE_STATION:
1181                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1182                         break;
1183                 case NL80211_IFTYPE_ADHOC:
1184                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1185                         break;
1186                 case NL80211_IFTYPE_MESH_POINT:
1187                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1188                                 break;
1189                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1190                         break;
1191                 default:
1192                         WARN(1, "frame for unexpected interface type");
1193                         break;
1194                 }
1195
1196                 kfree_skb(skb);
1197         }
1198
1199         /* then other type-dependent work */
1200         switch (sdata->vif.type) {
1201         case NL80211_IFTYPE_STATION:
1202                 ieee80211_sta_work(sdata);
1203                 break;
1204         case NL80211_IFTYPE_ADHOC:
1205                 ieee80211_ibss_work(sdata);
1206                 break;
1207         case NL80211_IFTYPE_MESH_POINT:
1208                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1209                         break;
1210                 ieee80211_mesh_work(sdata);
1211                 break;
1212         default:
1213                 break;
1214         }
1215 }
1216
1217 static void ieee80211_recalc_smps_work(struct work_struct *work)
1218 {
1219         struct ieee80211_sub_if_data *sdata =
1220                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1221
1222         ieee80211_recalc_smps(sdata);
1223 }
1224
1225 /*
1226  * Helper function to initialise an interface to a specific type.
1227  */
1228 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1229                                   enum nl80211_iftype type)
1230 {
1231         /* clear type-dependent union */
1232         memset(&sdata->u, 0, sizeof(sdata->u));
1233
1234         /* and set some type-dependent values */
1235         sdata->vif.type = type;
1236         sdata->vif.p2p = false;
1237         sdata->wdev.iftype = type;
1238
1239         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1240         sdata->control_port_no_encrypt = false;
1241
1242         sdata->noack_map = 0;
1243
1244         /* only monitor/p2p-device differ */
1245         if (sdata->dev) {
1246                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1247                 sdata->dev->type = ARPHRD_ETHER;
1248         }
1249
1250         skb_queue_head_init(&sdata->skb_queue);
1251         INIT_WORK(&sdata->work, ieee80211_iface_work);
1252         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1253
1254         switch (type) {
1255         case NL80211_IFTYPE_P2P_GO:
1256                 type = NL80211_IFTYPE_AP;
1257                 sdata->vif.type = type;
1258                 sdata->vif.p2p = true;
1259                 /* fall through */
1260         case NL80211_IFTYPE_AP:
1261                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1262                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1263                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1264                 break;
1265         case NL80211_IFTYPE_P2P_CLIENT:
1266                 type = NL80211_IFTYPE_STATION;
1267                 sdata->vif.type = type;
1268                 sdata->vif.p2p = true;
1269                 /* fall through */
1270         case NL80211_IFTYPE_STATION:
1271                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1272                 ieee80211_sta_setup_sdata(sdata);
1273                 break;
1274         case NL80211_IFTYPE_ADHOC:
1275                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1276                 ieee80211_ibss_setup_sdata(sdata);
1277                 break;
1278         case NL80211_IFTYPE_MESH_POINT:
1279                 if (ieee80211_vif_is_mesh(&sdata->vif))
1280                         ieee80211_mesh_init_sdata(sdata);
1281                 break;
1282         case NL80211_IFTYPE_MONITOR:
1283                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1284                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1285                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1286                                       MONITOR_FLAG_OTHER_BSS;
1287                 break;
1288         case NL80211_IFTYPE_WDS:
1289                 sdata->vif.bss_conf.bssid = NULL;
1290                 break;
1291         case NL80211_IFTYPE_AP_VLAN:
1292                 break;
1293         case NL80211_IFTYPE_P2P_DEVICE:
1294                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1295                 break;
1296         case NL80211_IFTYPE_UNSPECIFIED:
1297         case NUM_NL80211_IFTYPES:
1298                 BUG();
1299                 break;
1300         }
1301
1302         ieee80211_debugfs_add_netdev(sdata);
1303 }
1304
1305 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1306                                            enum nl80211_iftype type)
1307 {
1308         struct ieee80211_local *local = sdata->local;
1309         int ret, err;
1310         enum nl80211_iftype internal_type = type;
1311         bool p2p = false;
1312
1313         ASSERT_RTNL();
1314
1315         if (!local->ops->change_interface)
1316                 return -EBUSY;
1317
1318         switch (sdata->vif.type) {
1319         case NL80211_IFTYPE_AP:
1320         case NL80211_IFTYPE_STATION:
1321         case NL80211_IFTYPE_ADHOC:
1322                 /*
1323                  * Could maybe also all others here?
1324                  * Just not sure how that interacts
1325                  * with the RX/config path e.g. for
1326                  * mesh.
1327                  */
1328                 break;
1329         default:
1330                 return -EBUSY;
1331         }
1332
1333         switch (type) {
1334         case NL80211_IFTYPE_AP:
1335         case NL80211_IFTYPE_STATION:
1336         case NL80211_IFTYPE_ADHOC:
1337                 /*
1338                  * Could probably support everything
1339                  * but WDS here (WDS do_open can fail
1340                  * under memory pressure, which this
1341                  * code isn't prepared to handle).
1342                  */
1343                 break;
1344         case NL80211_IFTYPE_P2P_CLIENT:
1345                 p2p = true;
1346                 internal_type = NL80211_IFTYPE_STATION;
1347                 break;
1348         case NL80211_IFTYPE_P2P_GO:
1349                 p2p = true;
1350                 internal_type = NL80211_IFTYPE_AP;
1351                 break;
1352         default:
1353                 return -EBUSY;
1354         }
1355
1356         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1357         if (ret)
1358                 return ret;
1359
1360         ieee80211_do_stop(sdata, false);
1361
1362         ieee80211_teardown_sdata(sdata);
1363
1364         ret = drv_change_interface(local, sdata, internal_type, p2p);
1365         if (ret)
1366                 type = sdata->vif.type;
1367
1368         /*
1369          * Ignore return value here, there's not much we can do since
1370          * the driver changed the interface type internally already.
1371          * The warnings will hopefully make driver authors fix it :-)
1372          */
1373         ieee80211_check_queues(sdata);
1374
1375         ieee80211_setup_sdata(sdata, type);
1376
1377         err = ieee80211_do_open(&sdata->wdev, false);
1378         WARN(err, "type change: do_open returned %d", err);
1379
1380         return ret;
1381 }
1382
1383 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1384                              enum nl80211_iftype type)
1385 {
1386         int ret;
1387
1388         ASSERT_RTNL();
1389
1390         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1391                 return 0;
1392
1393         if (ieee80211_sdata_running(sdata)) {
1394                 ret = ieee80211_runtime_change_iftype(sdata, type);
1395                 if (ret)
1396                         return ret;
1397         } else {
1398                 /* Purge and reset type-dependent state. */
1399                 ieee80211_teardown_sdata(sdata);
1400                 ieee80211_setup_sdata(sdata, type);
1401         }
1402
1403         /* reset some values that shouldn't be kept across type changes */
1404         sdata->drop_unencrypted = 0;
1405         if (type == NL80211_IFTYPE_STATION)
1406                 sdata->u.mgd.use_4addr = false;
1407
1408         return 0;
1409 }
1410
1411 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1412                                        u8 *perm_addr, enum nl80211_iftype type)
1413 {
1414         struct ieee80211_sub_if_data *sdata;
1415         u64 mask, start, addr, val, inc;
1416         u8 *m;
1417         u8 tmp_addr[ETH_ALEN];
1418         int i;
1419
1420         /* default ... something at least */
1421         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1422
1423         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1424             local->hw.wiphy->n_addresses <= 1)
1425                 return;
1426
1427         mutex_lock(&local->iflist_mtx);
1428
1429         switch (type) {
1430         case NL80211_IFTYPE_MONITOR:
1431                 /* doesn't matter */
1432                 break;
1433         case NL80211_IFTYPE_WDS:
1434         case NL80211_IFTYPE_AP_VLAN:
1435                 /* match up with an AP interface */
1436                 list_for_each_entry(sdata, &local->interfaces, list) {
1437                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1438                                 continue;
1439                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1440                         break;
1441                 }
1442                 /* keep default if no AP interface present */
1443                 break;
1444         case NL80211_IFTYPE_P2P_CLIENT:
1445         case NL80211_IFTYPE_P2P_GO:
1446                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1447                         list_for_each_entry(sdata, &local->interfaces, list) {
1448                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1449                                         continue;
1450                                 if (!ieee80211_sdata_running(sdata))
1451                                         continue;
1452                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1453                                 goto out_unlock;
1454                         }
1455                 }
1456                 /* otherwise fall through */
1457         default:
1458                 /* assign a new address if possible -- try n_addresses first */
1459                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1460                         bool used = false;
1461
1462                         list_for_each_entry(sdata, &local->interfaces, list) {
1463                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1464                                            sdata->vif.addr, ETH_ALEN) == 0) {
1465                                         used = true;
1466                                         break;
1467                                 }
1468                         }
1469
1470                         if (!used) {
1471                                 memcpy(perm_addr,
1472                                        local->hw.wiphy->addresses[i].addr,
1473                                        ETH_ALEN);
1474                                 break;
1475                         }
1476                 }
1477
1478                 /* try mask if available */
1479                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1480                         break;
1481
1482                 m = local->hw.wiphy->addr_mask;
1483                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1484                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1485                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1486
1487                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1488                         /* not a contiguous mask ... not handled now! */
1489                         pr_info("not contiguous\n");
1490                         break;
1491                 }
1492
1493                 /*
1494                  * Pick address of existing interface in case user changed
1495                  * MAC address manually, default to perm_addr.
1496                  */
1497                 m = local->hw.wiphy->perm_addr;
1498                 list_for_each_entry(sdata, &local->interfaces, list) {
1499                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1500                                 continue;
1501                         m = sdata->vif.addr;
1502                         break;
1503                 }
1504                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1505                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1506                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1507
1508                 inc = 1ULL<<__ffs64(mask);
1509                 val = (start & mask);
1510                 addr = (start & ~mask) | (val & mask);
1511                 do {
1512                         bool used = false;
1513
1514                         tmp_addr[5] = addr >> 0*8;
1515                         tmp_addr[4] = addr >> 1*8;
1516                         tmp_addr[3] = addr >> 2*8;
1517                         tmp_addr[2] = addr >> 3*8;
1518                         tmp_addr[1] = addr >> 4*8;
1519                         tmp_addr[0] = addr >> 5*8;
1520
1521                         val += inc;
1522
1523                         list_for_each_entry(sdata, &local->interfaces, list) {
1524                                 if (memcmp(tmp_addr, sdata->vif.addr,
1525                                                         ETH_ALEN) == 0) {
1526                                         used = true;
1527                                         break;
1528                                 }
1529                         }
1530
1531                         if (!used) {
1532                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1533                                 break;
1534                         }
1535                         addr = (start & ~mask) | (val & mask);
1536                 } while (addr != start);
1537
1538                 break;
1539         }
1540
1541  out_unlock:
1542         mutex_unlock(&local->iflist_mtx);
1543 }
1544
1545 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1546 {
1547         struct ieee80211_sub_if_data *sdata;
1548
1549         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1550
1551         ieee80211_cleanup_sdata_stas(sdata);
1552 }
1553
1554 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1555                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1556                      struct vif_params *params)
1557 {
1558         struct net_device *ndev = NULL;
1559         struct ieee80211_sub_if_data *sdata = NULL;
1560         int ret, i;
1561         int txqs = 1;
1562
1563         ASSERT_RTNL();
1564
1565         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1566                 struct wireless_dev *wdev;
1567
1568                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1569                                 GFP_KERNEL);
1570                 if (!sdata)
1571                         return -ENOMEM;
1572                 wdev = &sdata->wdev;
1573
1574                 sdata->dev = NULL;
1575                 strlcpy(sdata->name, name, IFNAMSIZ);
1576                 ieee80211_assign_perm_addr(local, wdev->address, type);
1577                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1578         } else {
1579                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1580                         txqs = IEEE80211_NUM_ACS;
1581
1582                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1583                                         local->hw.vif_data_size,
1584                                         name, ieee80211_if_setup, txqs, 1);
1585                 if (!ndev)
1586                         return -ENOMEM;
1587                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1588
1589                 ndev->needed_headroom = local->tx_headroom +
1590                                         4*6 /* four MAC addresses */
1591                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1592                                         + 6 /* mesh */
1593                                         + 8 /* rfc1042/bridge tunnel */
1594                                         - ETH_HLEN /* ethernet hard_header_len */
1595                                         + IEEE80211_ENCRYPT_HEADROOM;
1596                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1597
1598                 ret = dev_alloc_name(ndev, ndev->name);
1599                 if (ret < 0) {
1600                         free_netdev(ndev);
1601                         return ret;
1602                 }
1603
1604                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1605                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1606                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1607
1608                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1609                 sdata = netdev_priv(ndev);
1610                 ndev->ieee80211_ptr = &sdata->wdev;
1611                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1612                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1613
1614                 sdata->dev = ndev;
1615         }
1616
1617         /* initialise type-independent data */
1618         sdata->wdev.wiphy = local->hw.wiphy;
1619         sdata->local = local;
1620
1621         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1622                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1623
1624         INIT_LIST_HEAD(&sdata->key_list);
1625
1626         spin_lock_init(&sdata->cleanup_stations_lock);
1627         INIT_LIST_HEAD(&sdata->cleanup_stations);
1628         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1629         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1630                           ieee80211_dfs_cac_timer_work);
1631         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1632                           ieee80211_delayed_tailroom_dec);
1633
1634         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1635                 struct ieee80211_supported_band *sband;
1636                 sband = local->hw.wiphy->bands[i];
1637                 sdata->rc_rateidx_mask[i] =
1638                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1639                 if (sband)
1640                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1641                                sband->ht_cap.mcs.rx_mask,
1642                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1643                 else
1644                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1645                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1646         }
1647
1648         ieee80211_set_default_queues(sdata);
1649
1650         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1651         sdata->user_power_level = local->user_power_level;
1652
1653         /* setup type-dependent data */
1654         ieee80211_setup_sdata(sdata, type);
1655
1656         if (ndev) {
1657                 if (params) {
1658                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1659                         if (type == NL80211_IFTYPE_STATION)
1660                                 sdata->u.mgd.use_4addr = params->use_4addr;
1661                 }
1662
1663                 ndev->features |= local->hw.netdev_features;
1664
1665                 ret = register_netdevice(ndev);
1666                 if (ret) {
1667                         free_netdev(ndev);
1668                         return ret;
1669                 }
1670         }
1671
1672         mutex_lock(&local->iflist_mtx);
1673         list_add_tail_rcu(&sdata->list, &local->interfaces);
1674         mutex_unlock(&local->iflist_mtx);
1675
1676         if (new_wdev)
1677                 *new_wdev = &sdata->wdev;
1678
1679         return 0;
1680 }
1681
1682 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1683 {
1684         ASSERT_RTNL();
1685
1686         mutex_lock(&sdata->local->iflist_mtx);
1687         list_del_rcu(&sdata->list);
1688         mutex_unlock(&sdata->local->iflist_mtx);
1689
1690         synchronize_rcu();
1691
1692         if (sdata->dev) {
1693                 unregister_netdevice(sdata->dev);
1694         } else {
1695                 cfg80211_unregister_wdev(&sdata->wdev);
1696                 kfree(sdata);
1697         }
1698 }
1699
1700 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1701 {
1702         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1703                 return;
1704         ieee80211_do_stop(sdata, true);
1705         ieee80211_teardown_sdata(sdata);
1706 }
1707
1708 /*
1709  * Remove all interfaces, may only be called at hardware unregistration
1710  * time because it doesn't do RCU-safe list removals.
1711  */
1712 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1713 {
1714         struct ieee80211_sub_if_data *sdata, *tmp;
1715         LIST_HEAD(unreg_list);
1716         LIST_HEAD(wdev_list);
1717
1718         ASSERT_RTNL();
1719
1720         /*
1721          * Close all AP_VLAN interfaces first, as otherwise they
1722          * might be closed while the AP interface they belong to
1723          * is closed, causing unregister_netdevice_many() to crash.
1724          */
1725         list_for_each_entry(sdata, &local->interfaces, list)
1726                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1727                         dev_close(sdata->dev);
1728
1729         /*
1730          * Close all AP_VLAN interfaces first, as otherwise they
1731          * might be closed while the AP interface they belong to
1732          * is closed, causing unregister_netdevice_many() to crash.
1733          */
1734         list_for_each_entry(sdata, &local->interfaces, list)
1735                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1736                         dev_close(sdata->dev);
1737
1738         mutex_lock(&local->iflist_mtx);
1739         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1740                 list_del(&sdata->list);
1741
1742                 if (sdata->dev)
1743                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1744                 else
1745                         list_add(&sdata->list, &wdev_list);
1746         }
1747         mutex_unlock(&local->iflist_mtx);
1748         unregister_netdevice_many(&unreg_list);
1749         list_del(&unreg_list);
1750
1751         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1752                 list_del(&sdata->list);
1753                 cfg80211_unregister_wdev(&sdata->wdev);
1754                 kfree(sdata);
1755         }
1756 }
1757
1758 static int netdev_notify(struct notifier_block *nb,
1759                          unsigned long state,
1760                          void *ndev)
1761 {
1762         struct net_device *dev = ndev;
1763         struct ieee80211_sub_if_data *sdata;
1764
1765         if (state != NETDEV_CHANGENAME)
1766                 return 0;
1767
1768         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1769                 return 0;
1770
1771         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1772                 return 0;
1773
1774         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1775
1776         memcpy(sdata->name, dev->name, IFNAMSIZ);
1777
1778         ieee80211_debugfs_rename_netdev(sdata);
1779         return 0;
1780 }
1781
1782 static struct notifier_block mac80211_netdev_notifier = {
1783         .notifier_call = netdev_notify,
1784 };
1785
1786 int ieee80211_iface_init(void)
1787 {
1788         return register_netdevice_notifier(&mac80211_netdev_notifier);
1789 }
1790
1791 void ieee80211_iface_exit(void)
1792 {
1793         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1794 }