Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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         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_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                 /* we're brought up, everything changes */
503                 hw_reconf_flags = ~0;
504                 ieee80211_led_radio(local, true);
505                 ieee80211_mod_tpt_led_trig(local,
506                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
507         }
508
509         /*
510          * Copy the hopefully now-present MAC address to
511          * this interface, if it has the special null one.
512          */
513         if (dev && is_zero_ether_addr(dev->dev_addr)) {
514                 memcpy(dev->dev_addr,
515                        local->hw.wiphy->perm_addr,
516                        ETH_ALEN);
517                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
518
519                 if (!is_valid_ether_addr(dev->dev_addr)) {
520                         res = -EADDRNOTAVAIL;
521                         goto err_stop;
522                 }
523         }
524
525         switch (sdata->vif.type) {
526         case NL80211_IFTYPE_AP_VLAN:
527                 /* no need to tell driver, but set carrier and chanctx */
528                 if (rtnl_dereference(sdata->bss->beacon)) {
529                         ieee80211_vif_vlan_copy_chanctx(sdata);
530                         netif_carrier_on(dev);
531                 } else {
532                         netif_carrier_off(dev);
533                 }
534                 break;
535         case NL80211_IFTYPE_MONITOR:
536                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
537                         local->cooked_mntrs++;
538                         break;
539                 }
540
541                 if (local->monitors == 0 && local->open_count == 0) {
542                         res = ieee80211_add_virtual_monitor(local);
543                         if (res)
544                                 goto err_stop;
545                 }
546
547                 /* must be before the call to ieee80211_configure_filter */
548                 local->monitors++;
549                 if (local->monitors == 1) {
550                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
551                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
552                 }
553
554                 ieee80211_adjust_monitor_flags(sdata, 1);
555                 ieee80211_configure_filter(local);
556                 mutex_lock(&local->mtx);
557                 ieee80211_recalc_idle(local);
558                 mutex_unlock(&local->mtx);
559
560                 netif_carrier_on(dev);
561                 break;
562         default:
563                 if (coming_up) {
564                         ieee80211_del_virtual_monitor(local);
565
566                         res = drv_add_interface(local, sdata);
567                         if (res)
568                                 goto err_stop;
569                         res = ieee80211_check_queues(sdata);
570                         if (res)
571                                 goto err_del_interface;
572                 }
573
574                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
575                         local->fif_pspoll++;
576                         local->fif_probe_req++;
577
578                         ieee80211_configure_filter(local);
579                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
580                         local->fif_probe_req++;
581                 }
582
583                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
584                         changed |= ieee80211_reset_erp_info(sdata);
585                 ieee80211_bss_info_change_notify(sdata, changed);
586
587                 switch (sdata->vif.type) {
588                 case NL80211_IFTYPE_STATION:
589                 case NL80211_IFTYPE_ADHOC:
590                 case NL80211_IFTYPE_AP:
591                 case NL80211_IFTYPE_MESH_POINT:
592                         netif_carrier_off(dev);
593                         break;
594                 case NL80211_IFTYPE_WDS:
595                 case NL80211_IFTYPE_P2P_DEVICE:
596                         break;
597                 default:
598                         netif_carrier_on(dev);
599                 }
600
601                 /*
602                  * set default queue parameters so drivers don't
603                  * need to initialise the hardware if the hardware
604                  * doesn't start up with sane defaults
605                  */
606                 ieee80211_set_wmm_default(sdata, true);
607         }
608
609         set_bit(SDATA_STATE_RUNNING, &sdata->state);
610
611         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
612                 /* Create STA entry for the WDS peer */
613                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
614                                      GFP_KERNEL);
615                 if (!sta) {
616                         res = -ENOMEM;
617                         goto err_del_interface;
618                 }
619
620                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
621                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
622                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
623
624                 res = sta_info_insert(sta);
625                 if (res) {
626                         /* STA has been freed */
627                         goto err_del_interface;
628                 }
629
630                 rate_control_rate_init(sta);
631                 netif_carrier_on(dev);
632         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
633                 rcu_assign_pointer(local->p2p_sdata, sdata);
634         }
635
636         /*
637          * set_multicast_list will be invoked by the networking core
638          * which will check whether any increments here were done in
639          * error and sync them down to the hardware as filter flags.
640          */
641         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
642                 atomic_inc(&local->iff_allmultis);
643
644         if (sdata->flags & IEEE80211_SDATA_PROMISC)
645                 atomic_inc(&local->iff_promiscs);
646
647         if (coming_up)
648                 local->open_count++;
649
650         if (hw_reconf_flags)
651                 ieee80211_hw_config(local, hw_reconf_flags);
652
653         ieee80211_recalc_ps(local, -1);
654
655         if (dev)
656                 netif_tx_start_all_queues(dev);
657
658         return 0;
659  err_del_interface:
660         drv_remove_interface(local, sdata);
661  err_stop:
662         if (!local->open_count)
663                 drv_stop(local);
664  err_del_bss:
665         sdata->bss = NULL;
666         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
667                 list_del(&sdata->u.vlan.list);
668         /* might already be clear but that doesn't matter */
669         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
670         return res;
671 }
672
673 static int ieee80211_open(struct net_device *dev)
674 {
675         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
676         int err;
677
678         /* fail early if user set an invalid address */
679         if (!is_valid_ether_addr(dev->dev_addr))
680                 return -EADDRNOTAVAIL;
681
682         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
683         if (err)
684                 return err;
685
686         return ieee80211_do_open(&sdata->wdev, true);
687 }
688
689 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
690                               bool going_down)
691 {
692         struct ieee80211_local *local = sdata->local;
693         unsigned long flags;
694         struct sk_buff *skb, *tmp;
695         u32 hw_reconf_flags = 0;
696         int i, flushed;
697         struct ps_data *ps;
698
699         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
700
701         if (rcu_access_pointer(local->scan_sdata) == sdata)
702                 ieee80211_scan_cancel(local);
703
704         /*
705          * Stop TX on this interface first.
706          */
707         if (sdata->dev)
708                 netif_tx_stop_all_queues(sdata->dev);
709
710         ieee80211_roc_purge(sdata);
711
712         if (sdata->vif.type == NL80211_IFTYPE_STATION)
713                 ieee80211_mgd_stop(sdata);
714
715         /*
716          * Remove all stations associated with this interface.
717          *
718          * This must be done before calling ops->remove_interface()
719          * because otherwise we can later invoke ops->sta_notify()
720          * whenever the STAs are removed, and that invalidates driver
721          * assumptions about always getting a vif pointer that is valid
722          * (because if we remove a STA after ops->remove_interface()
723          * the driver will have removed the vif info already!)
724          *
725          * This is relevant only in WDS mode, in all other modes we've
726          * already removed all stations when disconnecting or similar,
727          * so warn otherwise.
728          *
729          * We call sta_info_flush_cleanup() later, to combine RCU waits.
730          */
731         flushed = sta_info_flush_defer(sdata);
732         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
733                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
734
735         /*
736          * Don't count this interface for promisc/allmulti while it
737          * is down. dev_mc_unsync() will invoke set_multicast_list
738          * on the master interface which will sync these down to the
739          * hardware as filter flags.
740          */
741         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
742                 atomic_dec(&local->iff_allmultis);
743
744         if (sdata->flags & IEEE80211_SDATA_PROMISC)
745                 atomic_dec(&local->iff_promiscs);
746
747         if (sdata->vif.type == NL80211_IFTYPE_AP) {
748                 local->fif_pspoll--;
749                 local->fif_probe_req--;
750         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
751                 local->fif_probe_req--;
752         }
753
754         if (sdata->dev) {
755                 netif_addr_lock_bh(sdata->dev);
756                 spin_lock_bh(&local->filter_lock);
757                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
758                                  sdata->dev->addr_len);
759                 spin_unlock_bh(&local->filter_lock);
760                 netif_addr_unlock_bh(sdata->dev);
761
762                 ieee80211_configure_filter(local);
763         }
764
765         del_timer_sync(&local->dynamic_ps_timer);
766         cancel_work_sync(&local->dynamic_ps_enable_work);
767
768         cancel_work_sync(&sdata->recalc_smps);
769
770         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
771
772         if (sdata->wdev.cac_started) {
773                 mutex_lock(&local->iflist_mtx);
774                 ieee80211_vif_release_channel(sdata);
775                 mutex_unlock(&local->iflist_mtx);
776                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
777                                    GFP_KERNEL);
778         }
779
780         /* APs need special treatment */
781         if (sdata->vif.type == NL80211_IFTYPE_AP) {
782                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
783
784                 /* down all dependent devices, that is VLANs */
785                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
786                                          u.vlan.list)
787                         dev_close(vlan->dev);
788                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
789         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
790                 /* remove all packets in parent bc_buf pointing to this dev */
791                 ps = &sdata->bss->ps;
792
793                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
794                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
795                         if (skb->dev == sdata->dev) {
796                                 __skb_unlink(skb, &ps->bc_buf);
797                                 local->total_ps_buffered--;
798                                 ieee80211_free_txskb(&local->hw, skb);
799                         }
800                 }
801                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
802         }
803
804         if (going_down)
805                 local->open_count--;
806
807         switch (sdata->vif.type) {
808         case NL80211_IFTYPE_AP_VLAN:
809                 list_del(&sdata->u.vlan.list);
810                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
811                 /* no need to tell driver */
812                 break;
813         case NL80211_IFTYPE_MONITOR:
814                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
815                         local->cooked_mntrs--;
816                         break;
817                 }
818
819                 local->monitors--;
820                 if (local->monitors == 0) {
821                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
822                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
823                         ieee80211_del_virtual_monitor(local);
824                 }
825
826                 ieee80211_adjust_monitor_flags(sdata, -1);
827                 ieee80211_configure_filter(local);
828                 mutex_lock(&local->mtx);
829                 ieee80211_recalc_idle(local);
830                 mutex_unlock(&local->mtx);
831                 break;
832         case NL80211_IFTYPE_P2P_DEVICE:
833                 /* relies on synchronize_rcu() below */
834                 rcu_assign_pointer(local->p2p_sdata, NULL);
835                 /* fall through */
836         default:
837                 cancel_work_sync(&sdata->work);
838                 /*
839                  * When we get here, the interface is marked down.
840                  *
841                  * sta_info_flush_cleanup() requires rcu_barrier()
842                  * first to wait for the station call_rcu() calls
843                  * to complete, here we need at least sychronize_rcu()
844                  * it to wait for the RX path in case it is using the
845                  * interface and enqueuing frames at this very time on
846                  * another CPU.
847                  */
848                 rcu_barrier();
849                 sta_info_flush_cleanup(sdata);
850
851                 /*
852                  * Free all remaining keys, there shouldn't be any,
853                  * except maybe in WDS mode?
854                  */
855                 ieee80211_free_keys(sdata);
856
857                 /* fall through */
858         case NL80211_IFTYPE_AP:
859                 skb_queue_purge(&sdata->skb_queue);
860
861                 if (going_down)
862                         drv_remove_interface(local, sdata);
863         }
864
865         sdata->bss = NULL;
866
867         ieee80211_recalc_ps(local, -1);
868
869         if (local->open_count == 0) {
870                 ieee80211_clear_tx_pending(local);
871                 ieee80211_stop_device(local);
872
873                 /* no reconfiguring after stop! */
874                 hw_reconf_flags = 0;
875         }
876
877         /* do after stop to avoid reconfiguring when we stop anyway */
878         if (hw_reconf_flags)
879                 ieee80211_hw_config(local, hw_reconf_flags);
880
881         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
882         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
883                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
884                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
885                         if (info->control.vif == &sdata->vif) {
886                                 __skb_unlink(skb, &local->pending[i]);
887                                 ieee80211_free_txskb(&local->hw, skb);
888                         }
889                 }
890         }
891         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
892
893         if (local->monitors == local->open_count && local->monitors > 0)
894                 ieee80211_add_virtual_monitor(local);
895 }
896
897 static int ieee80211_stop(struct net_device *dev)
898 {
899         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
900
901         ieee80211_do_stop(sdata, true);
902
903         return 0;
904 }
905
906 static void ieee80211_set_multicast_list(struct net_device *dev)
907 {
908         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
909         struct ieee80211_local *local = sdata->local;
910         int allmulti, promisc, sdata_allmulti, sdata_promisc;
911
912         allmulti = !!(dev->flags & IFF_ALLMULTI);
913         promisc = !!(dev->flags & IFF_PROMISC);
914         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
915         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
916
917         if (allmulti != sdata_allmulti) {
918                 if (dev->flags & IFF_ALLMULTI)
919                         atomic_inc(&local->iff_allmultis);
920                 else
921                         atomic_dec(&local->iff_allmultis);
922                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
923         }
924
925         if (promisc != sdata_promisc) {
926                 if (dev->flags & IFF_PROMISC)
927                         atomic_inc(&local->iff_promiscs);
928                 else
929                         atomic_dec(&local->iff_promiscs);
930                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
931         }
932
933         /*
934          * TODO: If somebody needs this on AP interfaces,
935          *       it can be enabled easily but multicast
936          *       addresses from VLANs need to be synced.
937          */
938         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
939             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
940             sdata->vif.type != NL80211_IFTYPE_AP)
941                 drv_set_multicast_list(local, sdata, &dev->mc);
942
943         spin_lock_bh(&local->filter_lock);
944         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
945         spin_unlock_bh(&local->filter_lock);
946         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
947 }
948
949 /*
950  * Called when the netdev is removed or, by the code below, before
951  * the interface type changes.
952  */
953 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
954 {
955         int flushed;
956         int i;
957
958         /* free extra data */
959         ieee80211_free_keys(sdata);
960
961         ieee80211_debugfs_remove_netdev(sdata);
962
963         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
964                 __skb_queue_purge(&sdata->fragments[i].skb_list);
965         sdata->fragment_next = 0;
966
967         if (ieee80211_vif_is_mesh(&sdata->vif))
968                 mesh_rmc_free(sdata);
969
970         flushed = sta_info_flush(sdata);
971         WARN_ON(flushed);
972 }
973
974 static void ieee80211_uninit(struct net_device *dev)
975 {
976         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
977 }
978
979 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
980                                          struct sk_buff *skb)
981 {
982         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
983 }
984
985 static const struct net_device_ops ieee80211_dataif_ops = {
986         .ndo_open               = ieee80211_open,
987         .ndo_stop               = ieee80211_stop,
988         .ndo_uninit             = ieee80211_uninit,
989         .ndo_start_xmit         = ieee80211_subif_start_xmit,
990         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
991         .ndo_change_mtu         = ieee80211_change_mtu,
992         .ndo_set_mac_address    = ieee80211_change_mac,
993         .ndo_select_queue       = ieee80211_netdev_select_queue,
994 };
995
996 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
997                                           struct sk_buff *skb)
998 {
999         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1000         struct ieee80211_local *local = sdata->local;
1001         struct ieee80211_hdr *hdr;
1002         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1003
1004         if (local->hw.queues < IEEE80211_NUM_ACS)
1005                 return 0;
1006
1007         if (skb->len < 4 ||
1008             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1009                 return 0; /* doesn't matter, frame will be dropped */
1010
1011         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1012
1013         return ieee80211_select_queue_80211(sdata, skb, hdr);
1014 }
1015
1016 static const struct net_device_ops ieee80211_monitorif_ops = {
1017         .ndo_open               = ieee80211_open,
1018         .ndo_stop               = ieee80211_stop,
1019         .ndo_uninit             = ieee80211_uninit,
1020         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1021         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1022         .ndo_change_mtu         = ieee80211_change_mtu,
1023         .ndo_set_mac_address    = eth_mac_addr,
1024         .ndo_select_queue       = ieee80211_monitor_select_queue,
1025 };
1026
1027 static void ieee80211_if_setup(struct net_device *dev)
1028 {
1029         ether_setup(dev);
1030         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1031         dev->netdev_ops = &ieee80211_dataif_ops;
1032         dev->destructor = free_netdev;
1033 }
1034
1035 static void ieee80211_iface_work(struct work_struct *work)
1036 {
1037         struct ieee80211_sub_if_data *sdata =
1038                 container_of(work, struct ieee80211_sub_if_data, work);
1039         struct ieee80211_local *local = sdata->local;
1040         struct sk_buff *skb;
1041         struct sta_info *sta;
1042         struct ieee80211_ra_tid *ra_tid;
1043
1044         if (!ieee80211_sdata_running(sdata))
1045                 return;
1046
1047         if (local->scanning)
1048                 return;
1049
1050         /*
1051          * ieee80211_queue_work() should have picked up most cases,
1052          * here we'll pick the rest.
1053          */
1054         if (WARN(local->suspended,
1055                  "interface work scheduled while going to suspend\n"))
1056                 return;
1057
1058         /* first process frames */
1059         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1060                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1061
1062                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1063                         ra_tid = (void *)&skb->cb;
1064                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1065                                                  ra_tid->tid);
1066                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1067                         ra_tid = (void *)&skb->cb;
1068                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1069                                                 ra_tid->tid);
1070                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1071                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1072                         int len = skb->len;
1073
1074                         mutex_lock(&local->sta_mtx);
1075                         sta = sta_info_get_bss(sdata, mgmt->sa);
1076                         if (sta) {
1077                                 switch (mgmt->u.action.u.addba_req.action_code) {
1078                                 case WLAN_ACTION_ADDBA_REQ:
1079                                         ieee80211_process_addba_request(
1080                                                         local, sta, mgmt, len);
1081                                         break;
1082                                 case WLAN_ACTION_ADDBA_RESP:
1083                                         ieee80211_process_addba_resp(local, sta,
1084                                                                      mgmt, len);
1085                                         break;
1086                                 case WLAN_ACTION_DELBA:
1087                                         ieee80211_process_delba(sdata, sta,
1088                                                                 mgmt, len);
1089                                         break;
1090                                 default:
1091                                         WARN_ON(1);
1092                                         break;
1093                                 }
1094                         }
1095                         mutex_unlock(&local->sta_mtx);
1096                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1097                         struct ieee80211_hdr *hdr = (void *)mgmt;
1098                         /*
1099                          * So the frame isn't mgmt, but frame_control
1100                          * is at the right place anyway, of course, so
1101                          * the if statement is correct.
1102                          *
1103                          * Warn if we have other data frame types here,
1104                          * they must not get here.
1105                          */
1106                         WARN_ON(hdr->frame_control &
1107                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1108                         WARN_ON(!(hdr->seq_ctrl &
1109                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1110                         /*
1111                          * This was a fragment of a frame, received while
1112                          * a block-ack session was active. That cannot be
1113                          * right, so terminate the session.
1114                          */
1115                         mutex_lock(&local->sta_mtx);
1116                         sta = sta_info_get_bss(sdata, mgmt->sa);
1117                         if (sta) {
1118                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1119                                                 IEEE80211_QOS_CTL_TID_MASK;
1120
1121                                 __ieee80211_stop_rx_ba_session(
1122                                         sta, tid, WLAN_BACK_RECIPIENT,
1123                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1124                                         true);
1125                         }
1126                         mutex_unlock(&local->sta_mtx);
1127                 } else switch (sdata->vif.type) {
1128                 case NL80211_IFTYPE_STATION:
1129                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1130                         break;
1131                 case NL80211_IFTYPE_ADHOC:
1132                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1133                         break;
1134                 case NL80211_IFTYPE_MESH_POINT:
1135                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1136                                 break;
1137                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1138                         break;
1139                 default:
1140                         WARN(1, "frame for unexpected interface type");
1141                         break;
1142                 }
1143
1144                 kfree_skb(skb);
1145         }
1146
1147         /* then other type-dependent work */
1148         switch (sdata->vif.type) {
1149         case NL80211_IFTYPE_STATION:
1150                 ieee80211_sta_work(sdata);
1151                 break;
1152         case NL80211_IFTYPE_ADHOC:
1153                 ieee80211_ibss_work(sdata);
1154                 break;
1155         case NL80211_IFTYPE_MESH_POINT:
1156                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1157                         break;
1158                 ieee80211_mesh_work(sdata);
1159                 break;
1160         default:
1161                 break;
1162         }
1163 }
1164
1165 static void ieee80211_recalc_smps_work(struct work_struct *work)
1166 {
1167         struct ieee80211_sub_if_data *sdata =
1168                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1169
1170         ieee80211_recalc_smps(sdata);
1171 }
1172
1173 /*
1174  * Helper function to initialise an interface to a specific type.
1175  */
1176 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1177                                   enum nl80211_iftype type)
1178 {
1179         /* clear type-dependent union */
1180         memset(&sdata->u, 0, sizeof(sdata->u));
1181
1182         /* and set some type-dependent values */
1183         sdata->vif.type = type;
1184         sdata->vif.p2p = false;
1185         sdata->wdev.iftype = type;
1186
1187         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1188         sdata->control_port_no_encrypt = false;
1189
1190         sdata->noack_map = 0;
1191
1192         /* only monitor/p2p-device differ */
1193         if (sdata->dev) {
1194                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1195                 sdata->dev->type = ARPHRD_ETHER;
1196         }
1197
1198         skb_queue_head_init(&sdata->skb_queue);
1199         INIT_WORK(&sdata->work, ieee80211_iface_work);
1200         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1201
1202         switch (type) {
1203         case NL80211_IFTYPE_P2P_GO:
1204                 type = NL80211_IFTYPE_AP;
1205                 sdata->vif.type = type;
1206                 sdata->vif.p2p = true;
1207                 /* fall through */
1208         case NL80211_IFTYPE_AP:
1209                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1210                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1211                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1212                 break;
1213         case NL80211_IFTYPE_P2P_CLIENT:
1214                 type = NL80211_IFTYPE_STATION;
1215                 sdata->vif.type = type;
1216                 sdata->vif.p2p = true;
1217                 /* fall through */
1218         case NL80211_IFTYPE_STATION:
1219                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1220                 ieee80211_sta_setup_sdata(sdata);
1221                 break;
1222         case NL80211_IFTYPE_ADHOC:
1223                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1224                 ieee80211_ibss_setup_sdata(sdata);
1225                 break;
1226         case NL80211_IFTYPE_MESH_POINT:
1227                 if (ieee80211_vif_is_mesh(&sdata->vif))
1228                         ieee80211_mesh_init_sdata(sdata);
1229                 break;
1230         case NL80211_IFTYPE_MONITOR:
1231                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1232                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1233                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1234                                       MONITOR_FLAG_OTHER_BSS;
1235                 break;
1236         case NL80211_IFTYPE_WDS:
1237                 sdata->vif.bss_conf.bssid = NULL;
1238                 break;
1239         case NL80211_IFTYPE_AP_VLAN:
1240                 break;
1241         case NL80211_IFTYPE_P2P_DEVICE:
1242                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1243                 break;
1244         case NL80211_IFTYPE_UNSPECIFIED:
1245         case NUM_NL80211_IFTYPES:
1246                 BUG();
1247                 break;
1248         }
1249
1250         ieee80211_debugfs_add_netdev(sdata);
1251 }
1252
1253 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1254                                            enum nl80211_iftype type)
1255 {
1256         struct ieee80211_local *local = sdata->local;
1257         int ret, err;
1258         enum nl80211_iftype internal_type = type;
1259         bool p2p = false;
1260
1261         ASSERT_RTNL();
1262
1263         if (!local->ops->change_interface)
1264                 return -EBUSY;
1265
1266         switch (sdata->vif.type) {
1267         case NL80211_IFTYPE_AP:
1268         case NL80211_IFTYPE_STATION:
1269         case NL80211_IFTYPE_ADHOC:
1270                 /*
1271                  * Could maybe also all others here?
1272                  * Just not sure how that interacts
1273                  * with the RX/config path e.g. for
1274                  * mesh.
1275                  */
1276                 break;
1277         default:
1278                 return -EBUSY;
1279         }
1280
1281         switch (type) {
1282         case NL80211_IFTYPE_AP:
1283         case NL80211_IFTYPE_STATION:
1284         case NL80211_IFTYPE_ADHOC:
1285                 /*
1286                  * Could probably support everything
1287                  * but WDS here (WDS do_open can fail
1288                  * under memory pressure, which this
1289                  * code isn't prepared to handle).
1290                  */
1291                 break;
1292         case NL80211_IFTYPE_P2P_CLIENT:
1293                 p2p = true;
1294                 internal_type = NL80211_IFTYPE_STATION;
1295                 break;
1296         case NL80211_IFTYPE_P2P_GO:
1297                 p2p = true;
1298                 internal_type = NL80211_IFTYPE_AP;
1299                 break;
1300         default:
1301                 return -EBUSY;
1302         }
1303
1304         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1305         if (ret)
1306                 return ret;
1307
1308         ieee80211_do_stop(sdata, false);
1309
1310         ieee80211_teardown_sdata(sdata);
1311
1312         ret = drv_change_interface(local, sdata, internal_type, p2p);
1313         if (ret)
1314                 type = sdata->vif.type;
1315
1316         /*
1317          * Ignore return value here, there's not much we can do since
1318          * the driver changed the interface type internally already.
1319          * The warnings will hopefully make driver authors fix it :-)
1320          */
1321         ieee80211_check_queues(sdata);
1322
1323         ieee80211_setup_sdata(sdata, type);
1324
1325         err = ieee80211_do_open(&sdata->wdev, false);
1326         WARN(err, "type change: do_open returned %d", err);
1327
1328         return ret;
1329 }
1330
1331 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1332                              enum nl80211_iftype type)
1333 {
1334         int ret;
1335
1336         ASSERT_RTNL();
1337
1338         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1339                 return 0;
1340
1341         if (ieee80211_sdata_running(sdata)) {
1342                 ret = ieee80211_runtime_change_iftype(sdata, type);
1343                 if (ret)
1344                         return ret;
1345         } else {
1346                 /* Purge and reset type-dependent state. */
1347                 ieee80211_teardown_sdata(sdata);
1348                 ieee80211_setup_sdata(sdata, type);
1349         }
1350
1351         /* reset some values that shouldn't be kept across type changes */
1352         sdata->drop_unencrypted = 0;
1353         if (type == NL80211_IFTYPE_STATION)
1354                 sdata->u.mgd.use_4addr = false;
1355
1356         return 0;
1357 }
1358
1359 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1360                                        u8 *perm_addr, enum nl80211_iftype type)
1361 {
1362         struct ieee80211_sub_if_data *sdata;
1363         u64 mask, start, addr, val, inc;
1364         u8 *m;
1365         u8 tmp_addr[ETH_ALEN];
1366         int i;
1367
1368         /* default ... something at least */
1369         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1370
1371         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1372             local->hw.wiphy->n_addresses <= 1)
1373                 return;
1374
1375         mutex_lock(&local->iflist_mtx);
1376
1377         switch (type) {
1378         case NL80211_IFTYPE_MONITOR:
1379                 /* doesn't matter */
1380                 break;
1381         case NL80211_IFTYPE_WDS:
1382         case NL80211_IFTYPE_AP_VLAN:
1383                 /* match up with an AP interface */
1384                 list_for_each_entry(sdata, &local->interfaces, list) {
1385                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1386                                 continue;
1387                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1388                         break;
1389                 }
1390                 /* keep default if no AP interface present */
1391                 break;
1392         case NL80211_IFTYPE_P2P_CLIENT:
1393         case NL80211_IFTYPE_P2P_GO:
1394                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1395                         list_for_each_entry(sdata, &local->interfaces, list) {
1396                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1397                                         continue;
1398                                 if (!ieee80211_sdata_running(sdata))
1399                                         continue;
1400                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1401                                 goto out_unlock;
1402                         }
1403                 }
1404                 /* otherwise fall through */
1405         default:
1406                 /* assign a new address if possible -- try n_addresses first */
1407                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1408                         bool used = false;
1409
1410                         list_for_each_entry(sdata, &local->interfaces, list) {
1411                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1412                                            sdata->vif.addr, ETH_ALEN) == 0) {
1413                                         used = true;
1414                                         break;
1415                                 }
1416                         }
1417
1418                         if (!used) {
1419                                 memcpy(perm_addr,
1420                                        local->hw.wiphy->addresses[i].addr,
1421                                        ETH_ALEN);
1422                                 break;
1423                         }
1424                 }
1425
1426                 /* try mask if available */
1427                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1428                         break;
1429
1430                 m = local->hw.wiphy->addr_mask;
1431                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1432                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1433                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1434
1435                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1436                         /* not a contiguous mask ... not handled now! */
1437                         pr_info("not contiguous\n");
1438                         break;
1439                 }
1440
1441                 m = local->hw.wiphy->perm_addr;
1442                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1443                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1444                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1445
1446                 inc = 1ULL<<__ffs64(mask);
1447                 val = (start & mask);
1448                 addr = (start & ~mask) | (val & mask);
1449                 do {
1450                         bool used = false;
1451
1452                         tmp_addr[5] = addr >> 0*8;
1453                         tmp_addr[4] = addr >> 1*8;
1454                         tmp_addr[3] = addr >> 2*8;
1455                         tmp_addr[2] = addr >> 3*8;
1456                         tmp_addr[1] = addr >> 4*8;
1457                         tmp_addr[0] = addr >> 5*8;
1458
1459                         val += inc;
1460
1461                         list_for_each_entry(sdata, &local->interfaces, list) {
1462                                 if (memcmp(tmp_addr, sdata->vif.addr,
1463                                                         ETH_ALEN) == 0) {
1464                                         used = true;
1465                                         break;
1466                                 }
1467                         }
1468
1469                         if (!used) {
1470                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1471                                 break;
1472                         }
1473                         addr = (start & ~mask) | (val & mask);
1474                 } while (addr != start);
1475
1476                 break;
1477         }
1478
1479  out_unlock:
1480         mutex_unlock(&local->iflist_mtx);
1481 }
1482
1483 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1484 {
1485         struct ieee80211_sub_if_data *sdata;
1486
1487         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1488
1489         ieee80211_cleanup_sdata_stas(sdata);
1490 }
1491
1492 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1493                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1494                      struct vif_params *params)
1495 {
1496         struct net_device *ndev = NULL;
1497         struct ieee80211_sub_if_data *sdata = NULL;
1498         int ret, i;
1499         int txqs = 1;
1500
1501         ASSERT_RTNL();
1502
1503         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1504                 struct wireless_dev *wdev;
1505
1506                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1507                                 GFP_KERNEL);
1508                 if (!sdata)
1509                         return -ENOMEM;
1510                 wdev = &sdata->wdev;
1511
1512                 sdata->dev = NULL;
1513                 strlcpy(sdata->name, name, IFNAMSIZ);
1514                 ieee80211_assign_perm_addr(local, wdev->address, type);
1515                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1516         } else {
1517                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1518                         txqs = IEEE80211_NUM_ACS;
1519
1520                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1521                                         local->hw.vif_data_size,
1522                                         name, ieee80211_if_setup, txqs, 1);
1523                 if (!ndev)
1524                         return -ENOMEM;
1525                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1526
1527                 ndev->needed_headroom = local->tx_headroom +
1528                                         4*6 /* four MAC addresses */
1529                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1530                                         + 6 /* mesh */
1531                                         + 8 /* rfc1042/bridge tunnel */
1532                                         - ETH_HLEN /* ethernet hard_header_len */
1533                                         + IEEE80211_ENCRYPT_HEADROOM;
1534                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1535
1536                 ret = dev_alloc_name(ndev, ndev->name);
1537                 if (ret < 0) {
1538                         free_netdev(ndev);
1539                         return ret;
1540                 }
1541
1542                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1543                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1544                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1545
1546                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1547                 sdata = netdev_priv(ndev);
1548                 ndev->ieee80211_ptr = &sdata->wdev;
1549                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1550                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1551
1552                 sdata->dev = ndev;
1553         }
1554
1555         /* initialise type-independent data */
1556         sdata->wdev.wiphy = local->hw.wiphy;
1557         sdata->local = local;
1558
1559         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1560                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1561
1562         INIT_LIST_HEAD(&sdata->key_list);
1563
1564         spin_lock_init(&sdata->cleanup_stations_lock);
1565         INIT_LIST_HEAD(&sdata->cleanup_stations);
1566         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1567         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1568                           ieee80211_dfs_cac_timer_work);
1569         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1570                           ieee80211_delayed_tailroom_dec);
1571
1572         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1573                 struct ieee80211_supported_band *sband;
1574                 sband = local->hw.wiphy->bands[i];
1575                 sdata->rc_rateidx_mask[i] =
1576                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1577                 if (sband)
1578                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1579                                sband->ht_cap.mcs.rx_mask,
1580                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1581                 else
1582                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1583                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1584         }
1585
1586         ieee80211_set_default_queues(sdata);
1587
1588         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1589         sdata->user_power_level = local->user_power_level;
1590
1591         /* setup type-dependent data */
1592         ieee80211_setup_sdata(sdata, type);
1593
1594         if (ndev) {
1595                 if (params) {
1596                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1597                         if (type == NL80211_IFTYPE_STATION)
1598                                 sdata->u.mgd.use_4addr = params->use_4addr;
1599                 }
1600
1601                 ndev->features |= local->hw.netdev_features;
1602
1603                 ret = register_netdevice(ndev);
1604                 if (ret) {
1605                         free_netdev(ndev);
1606                         return ret;
1607                 }
1608         }
1609
1610         mutex_lock(&local->iflist_mtx);
1611         list_add_tail_rcu(&sdata->list, &local->interfaces);
1612         mutex_unlock(&local->iflist_mtx);
1613
1614         if (new_wdev)
1615                 *new_wdev = &sdata->wdev;
1616
1617         return 0;
1618 }
1619
1620 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1621 {
1622         ASSERT_RTNL();
1623
1624         mutex_lock(&sdata->local->iflist_mtx);
1625         list_del_rcu(&sdata->list);
1626         mutex_unlock(&sdata->local->iflist_mtx);
1627
1628         synchronize_rcu();
1629
1630         if (sdata->dev) {
1631                 unregister_netdevice(sdata->dev);
1632         } else {
1633                 cfg80211_unregister_wdev(&sdata->wdev);
1634                 kfree(sdata);
1635         }
1636 }
1637
1638 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1639 {
1640         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1641                 return;
1642         ieee80211_do_stop(sdata, true);
1643         ieee80211_teardown_sdata(sdata);
1644 }
1645
1646 /*
1647  * Remove all interfaces, may only be called at hardware unregistration
1648  * time because it doesn't do RCU-safe list removals.
1649  */
1650 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1651 {
1652         struct ieee80211_sub_if_data *sdata, *tmp;
1653         LIST_HEAD(unreg_list);
1654         LIST_HEAD(wdev_list);
1655
1656         ASSERT_RTNL();
1657
1658         mutex_lock(&local->iflist_mtx);
1659         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1660                 list_del(&sdata->list);
1661
1662                 if (sdata->dev)
1663                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1664                 else
1665                         list_add(&sdata->list, &wdev_list);
1666         }
1667         mutex_unlock(&local->iflist_mtx);
1668         unregister_netdevice_many(&unreg_list);
1669         list_del(&unreg_list);
1670
1671         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1672                 list_del(&sdata->list);
1673                 cfg80211_unregister_wdev(&sdata->wdev);
1674                 kfree(sdata);
1675         }
1676 }
1677
1678 static int netdev_notify(struct notifier_block *nb,
1679                          unsigned long state,
1680                          void *ndev)
1681 {
1682         struct net_device *dev = ndev;
1683         struct ieee80211_sub_if_data *sdata;
1684
1685         if (state != NETDEV_CHANGENAME)
1686                 return 0;
1687
1688         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1689                 return 0;
1690
1691         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1692                 return 0;
1693
1694         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1695
1696         memcpy(sdata->name, dev->name, IFNAMSIZ);
1697
1698         ieee80211_debugfs_rename_netdev(sdata);
1699         return 0;
1700 }
1701
1702 static struct notifier_block mac80211_netdev_notifier = {
1703         .notifier_call = netdev_notify,
1704 };
1705
1706 int ieee80211_iface_init(void)
1707 {
1708         return register_netdevice_notifier(&mac80211_netdev_notifier);
1709 }
1710
1711 void ieee80211_iface_exit(void)
1712 {
1713         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1714 }