mac80211: enable WDS carrier only after adding station
[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
46 static u32 ieee80211_idle_off(struct ieee80211_local *local,
47                               const char *reason)
48 {
49         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
50                 return 0;
51
52         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
53         return IEEE80211_CONF_CHANGE_IDLE;
54 }
55
56 static u32 ieee80211_idle_on(struct ieee80211_local *local)
57 {
58         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
59                 return 0;
60
61         drv_flush(local, false);
62
63         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
64         return IEEE80211_CONF_CHANGE_IDLE;
65 }
66
67 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
68 {
69         struct ieee80211_sub_if_data *sdata;
70         int count = 0;
71         bool working = false, scanning = false;
72         unsigned int led_trig_start = 0, led_trig_stop = 0;
73         struct ieee80211_roc_work *roc;
74
75 #ifdef CONFIG_PROVE_LOCKING
76         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
77                 !lockdep_is_held(&local->iflist_mtx));
78 #endif
79         lockdep_assert_held(&local->mtx);
80
81         list_for_each_entry(sdata, &local->interfaces, list) {
82                 if (!ieee80211_sdata_running(sdata)) {
83                         sdata->vif.bss_conf.idle = true;
84                         continue;
85                 }
86
87                 sdata->old_idle = sdata->vif.bss_conf.idle;
88
89                 /* do not count disabled managed interfaces */
90                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
91                     !sdata->u.mgd.associated &&
92                     !sdata->u.mgd.auth_data &&
93                     !sdata->u.mgd.assoc_data) {
94                         sdata->vif.bss_conf.idle = true;
95                         continue;
96                 }
97                 /* do not count unused IBSS interfaces */
98                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
99                     !sdata->u.ibss.ssid_len) {
100                         sdata->vif.bss_conf.idle = true;
101                         continue;
102                 }
103                 /* count everything else */
104                 sdata->vif.bss_conf.idle = false;
105                 count++;
106         }
107
108         if (!local->ops->remain_on_channel) {
109                 list_for_each_entry(roc, &local->roc_list, list) {
110                         working = true;
111                         roc->sdata->vif.bss_conf.idle = false;
112                 }
113         }
114
115         sdata = rcu_dereference_protected(local->scan_sdata,
116                                           lockdep_is_held(&local->mtx));
117         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
118                 scanning = true;
119                 sdata->vif.bss_conf.idle = false;
120         }
121
122         list_for_each_entry(sdata, &local->interfaces, list) {
123                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
124                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
125                         continue;
126                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
127                         continue;
128                 if (!ieee80211_sdata_running(sdata))
129                         continue;
130                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
131         }
132
133         if (working || scanning)
134                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
135         else
136                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
137
138         if (count)
139                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
140         else
141                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
142
143         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
144
145         if (working)
146                 return ieee80211_idle_off(local, "working");
147         if (scanning)
148                 return ieee80211_idle_off(local, "scanning");
149         if (!count)
150                 return ieee80211_idle_on(local);
151         else
152                 return ieee80211_idle_off(local, "in use");
153
154         return 0;
155 }
156
157 void ieee80211_recalc_idle(struct ieee80211_local *local)
158 {
159         u32 chg;
160
161         mutex_lock(&local->iflist_mtx);
162         chg = __ieee80211_recalc_idle(local);
163         mutex_unlock(&local->iflist_mtx);
164         if (chg)
165                 ieee80211_hw_config(local, chg);
166 }
167
168 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
169 {
170         int meshhdrlen;
171         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
172
173         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
174
175         /* FIX: what would be proper limits for MTU?
176          * This interface uses 802.3 frames. */
177         if (new_mtu < 256 ||
178             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
179                 return -EINVAL;
180         }
181
182         dev->mtu = new_mtu;
183         return 0;
184 }
185
186 static int ieee80211_change_mac(struct net_device *dev, void *addr)
187 {
188         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
189         struct sockaddr *sa = addr;
190         int ret;
191
192         if (ieee80211_sdata_running(sdata))
193                 return -EBUSY;
194
195         ret = eth_mac_addr(dev, sa);
196
197         if (ret == 0)
198                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
199
200         return ret;
201 }
202
203 static inline int identical_mac_addr_allowed(int type1, int type2)
204 {
205         return type1 == NL80211_IFTYPE_MONITOR ||
206                 type2 == NL80211_IFTYPE_MONITOR ||
207                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
208                 (type1 == NL80211_IFTYPE_WDS &&
209                         (type2 == NL80211_IFTYPE_WDS ||
210                          type2 == NL80211_IFTYPE_AP)) ||
211                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
212                 (type1 == NL80211_IFTYPE_AP_VLAN &&
213                         (type2 == NL80211_IFTYPE_AP ||
214                          type2 == NL80211_IFTYPE_AP_VLAN));
215 }
216
217 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
218                                             enum nl80211_iftype iftype)
219 {
220         struct ieee80211_local *local = sdata->local;
221         struct ieee80211_sub_if_data *nsdata;
222
223         ASSERT_RTNL();
224
225         /* we hold the RTNL here so can safely walk the list */
226         list_for_each_entry(nsdata, &local->interfaces, list) {
227                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
228                         /*
229                          * Allow only a single IBSS interface to be up at any
230                          * time. This is restricted because beacon distribution
231                          * cannot work properly if both are in the same IBSS.
232                          *
233                          * To remove this restriction we'd have to disallow them
234                          * from setting the same SSID on different IBSS interfaces
235                          * belonging to the same hardware. Then, however, we're
236                          * faced with having to adopt two different TSF timers...
237                          */
238                         if (iftype == NL80211_IFTYPE_ADHOC &&
239                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
240                                 return -EBUSY;
241
242                         /*
243                          * The remaining checks are only performed for interfaces
244                          * with the same MAC address.
245                          */
246                         if (!ether_addr_equal(sdata->vif.addr,
247                                               nsdata->vif.addr))
248                                 continue;
249
250                         /*
251                          * check whether it may have the same address
252                          */
253                         if (!identical_mac_addr_allowed(iftype,
254                                                         nsdata->vif.type))
255                                 return -ENOTUNIQ;
256
257                         /*
258                          * can only add VLANs to enabled APs
259                          */
260                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
261                             nsdata->vif.type == NL80211_IFTYPE_AP)
262                                 sdata->bss = &nsdata->u.ap;
263                 }
264         }
265
266         return 0;
267 }
268
269 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
270 {
271         int n_queues = sdata->local->hw.queues;
272         int i;
273
274         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
275                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
276                                  IEEE80211_INVAL_HW_QUEUE))
277                         return -EINVAL;
278                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
279                                  n_queues))
280                         return -EINVAL;
281         }
282
283         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
284             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
285                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
286                 return 0;
287         }
288
289         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
290                 return -EINVAL;
291
292         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
293                 return -EINVAL;
294
295         return 0;
296 }
297
298 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
299                                     const int offset)
300 {
301         struct ieee80211_local *local = sdata->local;
302         u32 flags = sdata->u.mntr_flags;
303
304 #define ADJUST(_f, _s)  do {                                    \
305         if (flags & MONITOR_FLAG_##_f)                          \
306                 local->fif_##_s += offset;                      \
307         } while (0)
308
309         ADJUST(FCSFAIL, fcsfail);
310         ADJUST(PLCPFAIL, plcpfail);
311         ADJUST(CONTROL, control);
312         ADJUST(CONTROL, pspoll);
313         ADJUST(OTHER_BSS, other_bss);
314
315 #undef ADJUST
316 }
317
318 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
319 {
320         struct ieee80211_local *local = sdata->local;
321         int i;
322
323         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
324                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
325                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
326                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
327                         sdata->vif.hw_queue[i] = i;
328                 else
329                         sdata->vif.hw_queue[i] = 0;
330         }
331         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
332 }
333
334 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
335 {
336         struct ieee80211_sub_if_data *sdata;
337         int ret = 0;
338
339         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
340                 return 0;
341
342         mutex_lock(&local->iflist_mtx);
343
344         if (local->monitor_sdata)
345                 goto out_unlock;
346
347         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
348         if (!sdata) {
349                 ret = -ENOMEM;
350                 goto out_unlock;
351         }
352
353         /* set up data */
354         sdata->local = local;
355         sdata->vif.type = NL80211_IFTYPE_MONITOR;
356         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
357                  wiphy_name(local->hw.wiphy));
358
359         ieee80211_set_default_queues(sdata);
360
361         ret = drv_add_interface(local, sdata);
362         if (WARN_ON(ret)) {
363                 /* ok .. stupid driver, it asked for this! */
364                 kfree(sdata);
365                 goto out_unlock;
366         }
367
368         ret = ieee80211_check_queues(sdata);
369         if (ret) {
370                 kfree(sdata);
371                 goto out_unlock;
372         }
373
374         rcu_assign_pointer(local->monitor_sdata, sdata);
375  out_unlock:
376         mutex_unlock(&local->iflist_mtx);
377         return ret;
378 }
379
380 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
381 {
382         struct ieee80211_sub_if_data *sdata;
383
384         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
385                 return;
386
387         mutex_lock(&local->iflist_mtx);
388
389         sdata = rcu_dereference_protected(local->monitor_sdata,
390                                           lockdep_is_held(&local->iflist_mtx));
391         if (!sdata)
392                 goto out_unlock;
393
394         rcu_assign_pointer(local->monitor_sdata, NULL);
395         synchronize_net();
396
397         drv_remove_interface(local, sdata);
398
399         kfree(sdata);
400  out_unlock:
401         mutex_unlock(&local->iflist_mtx);
402 }
403
404 /*
405  * NOTE: Be very careful when changing this function, it must NOT return
406  * an error on interface type changes that have been pre-checked, so most
407  * checks should be in ieee80211_check_concurrent_iface.
408  */
409 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
410 {
411         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
412         struct ieee80211_local *local = sdata->local;
413         struct sta_info *sta;
414         u32 changed = 0;
415         int res;
416         u32 hw_reconf_flags = 0;
417
418         switch (sdata->vif.type) {
419         case NL80211_IFTYPE_WDS:
420                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
421                         return -ENOLINK;
422                 break;
423         case NL80211_IFTYPE_AP_VLAN: {
424                 struct ieee80211_sub_if_data *master;
425
426                 if (!sdata->bss)
427                         return -ENOLINK;
428
429                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
430
431                 master = container_of(sdata->bss,
432                                       struct ieee80211_sub_if_data, u.ap);
433                 sdata->control_port_protocol =
434                         master->control_port_protocol;
435                 sdata->control_port_no_encrypt =
436                         master->control_port_no_encrypt;
437                 break;
438                 }
439         case NL80211_IFTYPE_AP:
440                 sdata->bss = &sdata->u.ap;
441                 break;
442         case NL80211_IFTYPE_MESH_POINT:
443         case NL80211_IFTYPE_STATION:
444         case NL80211_IFTYPE_MONITOR:
445         case NL80211_IFTYPE_ADHOC:
446                 /* no special treatment */
447                 break;
448         case NL80211_IFTYPE_UNSPECIFIED:
449         case NUM_NL80211_IFTYPES:
450         case NL80211_IFTYPE_P2P_CLIENT:
451         case NL80211_IFTYPE_P2P_GO:
452                 /* cannot happen */
453                 WARN_ON(1);
454                 break;
455         }
456
457         if (local->open_count == 0) {
458                 res = drv_start(local);
459                 if (res)
460                         goto err_del_bss;
461                 if (local->ops->napi_poll)
462                         napi_enable(&local->napi);
463                 /* we're brought up, everything changes */
464                 hw_reconf_flags = ~0;
465                 ieee80211_led_radio(local, true);
466                 ieee80211_mod_tpt_led_trig(local,
467                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
468         }
469
470         /*
471          * Copy the hopefully now-present MAC address to
472          * this interface, if it has the special null one.
473          */
474         if (is_zero_ether_addr(dev->dev_addr)) {
475                 memcpy(dev->dev_addr,
476                        local->hw.wiphy->perm_addr,
477                        ETH_ALEN);
478                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
479
480                 if (!is_valid_ether_addr(dev->dev_addr)) {
481                         res = -EADDRNOTAVAIL;
482                         goto err_stop;
483                 }
484         }
485
486         switch (sdata->vif.type) {
487         case NL80211_IFTYPE_AP_VLAN:
488                 /* no need to tell driver, but set carrier */
489                 if (rtnl_dereference(sdata->bss->beacon))
490                         netif_carrier_on(dev);
491                 else
492                         netif_carrier_off(dev);
493                 break;
494         case NL80211_IFTYPE_MONITOR:
495                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
496                         local->cooked_mntrs++;
497                         break;
498                 }
499
500                 if (local->monitors == 0 && local->open_count == 0) {
501                         res = ieee80211_add_virtual_monitor(local);
502                         if (res)
503                                 goto err_stop;
504                 }
505
506                 /* must be before the call to ieee80211_configure_filter */
507                 local->monitors++;
508                 if (local->monitors == 1) {
509                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
510                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
511                 }
512
513                 ieee80211_adjust_monitor_flags(sdata, 1);
514                 ieee80211_configure_filter(local);
515
516                 netif_carrier_on(dev);
517                 break;
518         default:
519                 if (coming_up) {
520                         ieee80211_del_virtual_monitor(local);
521
522                         res = drv_add_interface(local, sdata);
523                         if (res)
524                                 goto err_stop;
525                         res = ieee80211_check_queues(sdata);
526                         if (res)
527                                 goto err_del_interface;
528                 }
529
530                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
531                         local->fif_pspoll++;
532                         local->fif_probe_req++;
533
534                         ieee80211_configure_filter(local);
535                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
536                         local->fif_probe_req++;
537                 }
538
539                 changed |= ieee80211_reset_erp_info(sdata);
540                 ieee80211_bss_info_change_notify(sdata, changed);
541
542                 switch (sdata->vif.type) {
543                 case NL80211_IFTYPE_STATION:
544                 case NL80211_IFTYPE_ADHOC:
545                 case NL80211_IFTYPE_AP:
546                 case NL80211_IFTYPE_MESH_POINT:
547                         netif_carrier_off(dev);
548                         break;
549                 case NL80211_IFTYPE_WDS:
550                         break;
551                 default:
552                         netif_carrier_on(dev);
553                 }
554
555                 /*
556                  * set default queue parameters so drivers don't
557                  * need to initialise the hardware if the hardware
558                  * doesn't start up with sane defaults
559                  */
560                 ieee80211_set_wmm_default(sdata, true);
561         }
562
563         set_bit(SDATA_STATE_RUNNING, &sdata->state);
564
565         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
566                 /* Create STA entry for the WDS peer */
567                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
568                                      GFP_KERNEL);
569                 if (!sta) {
570                         res = -ENOMEM;
571                         goto err_del_interface;
572                 }
573
574                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
575                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
576                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
577
578                 res = sta_info_insert(sta);
579                 if (res) {
580                         /* STA has been freed */
581                         goto err_del_interface;
582                 }
583
584                 rate_control_rate_init(sta);
585                 netif_carrier_on(dev);
586         }
587
588         /*
589          * set_multicast_list will be invoked by the networking core
590          * which will check whether any increments here were done in
591          * error and sync them down to the hardware as filter flags.
592          */
593         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
594                 atomic_inc(&local->iff_allmultis);
595
596         if (sdata->flags & IEEE80211_SDATA_PROMISC)
597                 atomic_inc(&local->iff_promiscs);
598
599         mutex_lock(&local->mtx);
600         hw_reconf_flags |= __ieee80211_recalc_idle(local);
601         mutex_unlock(&local->mtx);
602
603         if (coming_up)
604                 local->open_count++;
605
606         if (hw_reconf_flags)
607                 ieee80211_hw_config(local, hw_reconf_flags);
608
609         ieee80211_recalc_ps(local, -1);
610
611         netif_tx_start_all_queues(dev);
612
613         return 0;
614  err_del_interface:
615         drv_remove_interface(local, sdata);
616  err_stop:
617         if (!local->open_count)
618                 drv_stop(local);
619  err_del_bss:
620         sdata->bss = NULL;
621         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
622                 list_del(&sdata->u.vlan.list);
623         /* might already be clear but that doesn't matter */
624         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
625         return res;
626 }
627
628 static int ieee80211_open(struct net_device *dev)
629 {
630         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
631         int err;
632
633         /* fail early if user set an invalid address */
634         if (!is_valid_ether_addr(dev->dev_addr))
635                 return -EADDRNOTAVAIL;
636
637         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
638         if (err)
639                 return err;
640
641         return ieee80211_do_open(dev, true);
642 }
643
644 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
645                               bool going_down)
646 {
647         struct ieee80211_local *local = sdata->local;
648         unsigned long flags;
649         struct sk_buff *skb, *tmp;
650         u32 hw_reconf_flags = 0;
651         int i;
652         enum nl80211_channel_type orig_ct;
653
654         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
655
656         if (rcu_access_pointer(local->scan_sdata) == sdata)
657                 ieee80211_scan_cancel(local);
658
659         /*
660          * Stop TX on this interface first.
661          */
662         netif_tx_stop_all_queues(sdata->dev);
663
664         ieee80211_roc_purge(sdata);
665
666         /*
667          * Remove all stations associated with this interface.
668          *
669          * This must be done before calling ops->remove_interface()
670          * because otherwise we can later invoke ops->sta_notify()
671          * whenever the STAs are removed, and that invalidates driver
672          * assumptions about always getting a vif pointer that is valid
673          * (because if we remove a STA after ops->remove_interface()
674          * the driver will have removed the vif info already!)
675          *
676          * This is relevant only in AP, WDS and mesh modes, since in
677          * all other modes we've already removed all stations when
678          * disconnecting etc.
679          */
680         sta_info_flush(local, sdata);
681
682         /*
683          * Don't count this interface for promisc/allmulti while it
684          * is down. dev_mc_unsync() will invoke set_multicast_list
685          * on the master interface which will sync these down to the
686          * hardware as filter flags.
687          */
688         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
689                 atomic_dec(&local->iff_allmultis);
690
691         if (sdata->flags & IEEE80211_SDATA_PROMISC)
692                 atomic_dec(&local->iff_promiscs);
693
694         if (sdata->vif.type == NL80211_IFTYPE_AP) {
695                 local->fif_pspoll--;
696                 local->fif_probe_req--;
697         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
698                 local->fif_probe_req--;
699         }
700
701         netif_addr_lock_bh(sdata->dev);
702         spin_lock_bh(&local->filter_lock);
703         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
704                          sdata->dev->addr_len);
705         spin_unlock_bh(&local->filter_lock);
706         netif_addr_unlock_bh(sdata->dev);
707
708         ieee80211_configure_filter(local);
709
710         del_timer_sync(&local->dynamic_ps_timer);
711         cancel_work_sync(&local->dynamic_ps_enable_work);
712
713         /* APs need special treatment */
714         if (sdata->vif.type == NL80211_IFTYPE_AP) {
715                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
716                 struct beacon_data *old_beacon =
717                         rtnl_dereference(sdata->u.ap.beacon);
718                 struct sk_buff *old_probe_resp =
719                         rtnl_dereference(sdata->u.ap.probe_resp);
720
721                 /* sdata_running will return false, so this will disable */
722                 ieee80211_bss_info_change_notify(sdata,
723                                                  BSS_CHANGED_BEACON_ENABLED);
724
725                 /* remove beacon and probe response */
726                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
727                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
728                 synchronize_rcu();
729                 kfree(old_beacon);
730                 kfree_skb(old_probe_resp);
731
732                 /* down all dependent devices, that is VLANs */
733                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
734                                          u.vlan.list)
735                         dev_close(vlan->dev);
736                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
737
738                 /* free all potentially still buffered bcast frames */
739                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
740                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
741         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
742                 ieee80211_mgd_stop(sdata);
743         }
744
745         if (going_down)
746                 local->open_count--;
747
748         switch (sdata->vif.type) {
749         case NL80211_IFTYPE_AP_VLAN:
750                 list_del(&sdata->u.vlan.list);
751                 /* no need to tell driver */
752                 break;
753         case NL80211_IFTYPE_MONITOR:
754                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
755                         local->cooked_mntrs--;
756                         break;
757                 }
758
759                 local->monitors--;
760                 if (local->monitors == 0) {
761                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
762                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
763                         ieee80211_del_virtual_monitor(local);
764                 }
765
766                 ieee80211_adjust_monitor_flags(sdata, -1);
767                 ieee80211_configure_filter(local);
768                 break;
769         default:
770                 flush_work(&sdata->work);
771                 /*
772                  * When we get here, the interface is marked down.
773                  * Call synchronize_rcu() to wait for the RX path
774                  * should it be using the interface and enqueuing
775                  * frames at this very time on another CPU.
776                  */
777                 synchronize_rcu();
778                 skb_queue_purge(&sdata->skb_queue);
779
780                 /*
781                  * Disable beaconing here for mesh only, AP and IBSS
782                  * are already taken care of.
783                  */
784                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
785                         ieee80211_bss_info_change_notify(sdata,
786                                 BSS_CHANGED_BEACON_ENABLED);
787
788                 /*
789                  * Free all remaining keys, there shouldn't be any,
790                  * except maybe group keys in AP more or WDS?
791                  */
792                 ieee80211_free_keys(sdata);
793
794                 if (going_down)
795                         drv_remove_interface(local, sdata);
796         }
797
798         sdata->bss = NULL;
799
800         mutex_lock(&local->mtx);
801         hw_reconf_flags |= __ieee80211_recalc_idle(local);
802         mutex_unlock(&local->mtx);
803
804         ieee80211_recalc_ps(local, -1);
805
806         if (local->open_count == 0) {
807                 if (local->ops->napi_poll)
808                         napi_disable(&local->napi);
809                 ieee80211_clear_tx_pending(local);
810                 ieee80211_stop_device(local);
811
812                 /* no reconfiguring after stop! */
813                 hw_reconf_flags = 0;
814         }
815
816         /* Re-calculate channel-type, in case there are multiple vifs
817          * on different channel types.
818          */
819         orig_ct = local->_oper_channel_type;
820         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
821
822         /* do after stop to avoid reconfiguring when we stop anyway */
823         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
824                 ieee80211_hw_config(local, hw_reconf_flags);
825
826         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
827         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
828                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
829                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
830                         if (info->control.vif == &sdata->vif) {
831                                 __skb_unlink(skb, &local->pending[i]);
832                                 dev_kfree_skb_irq(skb);
833                         }
834                 }
835         }
836         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
837
838         if (local->monitors == local->open_count && local->monitors > 0)
839                 ieee80211_add_virtual_monitor(local);
840 }
841
842 static int ieee80211_stop(struct net_device *dev)
843 {
844         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
845
846         ieee80211_do_stop(sdata, true);
847
848         return 0;
849 }
850
851 static void ieee80211_set_multicast_list(struct net_device *dev)
852 {
853         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
854         struct ieee80211_local *local = sdata->local;
855         int allmulti, promisc, sdata_allmulti, sdata_promisc;
856
857         allmulti = !!(dev->flags & IFF_ALLMULTI);
858         promisc = !!(dev->flags & IFF_PROMISC);
859         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
860         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
861
862         if (allmulti != sdata_allmulti) {
863                 if (dev->flags & IFF_ALLMULTI)
864                         atomic_inc(&local->iff_allmultis);
865                 else
866                         atomic_dec(&local->iff_allmultis);
867                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
868         }
869
870         if (promisc != sdata_promisc) {
871                 if (dev->flags & IFF_PROMISC)
872                         atomic_inc(&local->iff_promiscs);
873                 else
874                         atomic_dec(&local->iff_promiscs);
875                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
876         }
877         spin_lock_bh(&local->filter_lock);
878         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
879         spin_unlock_bh(&local->filter_lock);
880         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
881 }
882
883 /*
884  * Called when the netdev is removed or, by the code below, before
885  * the interface type changes.
886  */
887 static void ieee80211_teardown_sdata(struct net_device *dev)
888 {
889         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
890         struct ieee80211_local *local = sdata->local;
891         int flushed;
892         int i;
893
894         /* free extra data */
895         ieee80211_free_keys(sdata);
896
897         ieee80211_debugfs_remove_netdev(sdata);
898
899         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
900                 __skb_queue_purge(&sdata->fragments[i].skb_list);
901         sdata->fragment_next = 0;
902
903         if (ieee80211_vif_is_mesh(&sdata->vif))
904                 mesh_rmc_free(sdata);
905
906         flushed = sta_info_flush(local, sdata);
907         WARN_ON(flushed);
908 }
909
910 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
911                                          struct sk_buff *skb)
912 {
913         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
914 }
915
916 static const struct net_device_ops ieee80211_dataif_ops = {
917         .ndo_open               = ieee80211_open,
918         .ndo_stop               = ieee80211_stop,
919         .ndo_uninit             = ieee80211_teardown_sdata,
920         .ndo_start_xmit         = ieee80211_subif_start_xmit,
921         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
922         .ndo_change_mtu         = ieee80211_change_mtu,
923         .ndo_set_mac_address    = ieee80211_change_mac,
924         .ndo_select_queue       = ieee80211_netdev_select_queue,
925 };
926
927 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
928                                           struct sk_buff *skb)
929 {
930         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
931         struct ieee80211_local *local = sdata->local;
932         struct ieee80211_hdr *hdr;
933         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
934
935         if (local->hw.queues < IEEE80211_NUM_ACS)
936                 return 0;
937
938         if (skb->len < 4 ||
939             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
940                 return 0; /* doesn't matter, frame will be dropped */
941
942         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
943
944         return ieee80211_select_queue_80211(sdata, skb, hdr);
945 }
946
947 static const struct net_device_ops ieee80211_monitorif_ops = {
948         .ndo_open               = ieee80211_open,
949         .ndo_stop               = ieee80211_stop,
950         .ndo_uninit             = ieee80211_teardown_sdata,
951         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
952         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
953         .ndo_change_mtu         = ieee80211_change_mtu,
954         .ndo_set_mac_address    = eth_mac_addr,
955         .ndo_select_queue       = ieee80211_monitor_select_queue,
956 };
957
958 static void ieee80211_if_setup(struct net_device *dev)
959 {
960         ether_setup(dev);
961         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
962         dev->netdev_ops = &ieee80211_dataif_ops;
963         dev->destructor = free_netdev;
964 }
965
966 static void ieee80211_iface_work(struct work_struct *work)
967 {
968         struct ieee80211_sub_if_data *sdata =
969                 container_of(work, struct ieee80211_sub_if_data, work);
970         struct ieee80211_local *local = sdata->local;
971         struct sk_buff *skb;
972         struct sta_info *sta;
973         struct ieee80211_ra_tid *ra_tid;
974
975         if (!ieee80211_sdata_running(sdata))
976                 return;
977
978         if (local->scanning)
979                 return;
980
981         /*
982          * ieee80211_queue_work() should have picked up most cases,
983          * here we'll pick the rest.
984          */
985         if (WARN(local->suspended,
986                  "interface work scheduled while going to suspend\n"))
987                 return;
988
989         /* first process frames */
990         while ((skb = skb_dequeue(&sdata->skb_queue))) {
991                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
992
993                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
994                         ra_tid = (void *)&skb->cb;
995                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
996                                                  ra_tid->tid);
997                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
998                         ra_tid = (void *)&skb->cb;
999                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1000                                                 ra_tid->tid);
1001                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1002                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1003                         int len = skb->len;
1004
1005                         mutex_lock(&local->sta_mtx);
1006                         sta = sta_info_get_bss(sdata, mgmt->sa);
1007                         if (sta) {
1008                                 switch (mgmt->u.action.u.addba_req.action_code) {
1009                                 case WLAN_ACTION_ADDBA_REQ:
1010                                         ieee80211_process_addba_request(
1011                                                         local, sta, mgmt, len);
1012                                         break;
1013                                 case WLAN_ACTION_ADDBA_RESP:
1014                                         ieee80211_process_addba_resp(local, sta,
1015                                                                      mgmt, len);
1016                                         break;
1017                                 case WLAN_ACTION_DELBA:
1018                                         ieee80211_process_delba(sdata, sta,
1019                                                                 mgmt, len);
1020                                         break;
1021                                 default:
1022                                         WARN_ON(1);
1023                                         break;
1024                                 }
1025                         }
1026                         mutex_unlock(&local->sta_mtx);
1027                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1028                         struct ieee80211_hdr *hdr = (void *)mgmt;
1029                         /*
1030                          * So the frame isn't mgmt, but frame_control
1031                          * is at the right place anyway, of course, so
1032                          * the if statement is correct.
1033                          *
1034                          * Warn if we have other data frame types here,
1035                          * they must not get here.
1036                          */
1037                         WARN_ON(hdr->frame_control &
1038                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1039                         WARN_ON(!(hdr->seq_ctrl &
1040                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1041                         /*
1042                          * This was a fragment of a frame, received while
1043                          * a block-ack session was active. That cannot be
1044                          * right, so terminate the session.
1045                          */
1046                         mutex_lock(&local->sta_mtx);
1047                         sta = sta_info_get_bss(sdata, mgmt->sa);
1048                         if (sta) {
1049                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1050                                                 IEEE80211_QOS_CTL_TID_MASK;
1051
1052                                 __ieee80211_stop_rx_ba_session(
1053                                         sta, tid, WLAN_BACK_RECIPIENT,
1054                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1055                                         true);
1056                         }
1057                         mutex_unlock(&local->sta_mtx);
1058                 } else switch (sdata->vif.type) {
1059                 case NL80211_IFTYPE_STATION:
1060                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1061                         break;
1062                 case NL80211_IFTYPE_ADHOC:
1063                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1064                         break;
1065                 case NL80211_IFTYPE_MESH_POINT:
1066                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1067                                 break;
1068                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1069                         break;
1070                 default:
1071                         WARN(1, "frame for unexpected interface type");
1072                         break;
1073                 }
1074
1075                 kfree_skb(skb);
1076         }
1077
1078         /* then other type-dependent work */
1079         switch (sdata->vif.type) {
1080         case NL80211_IFTYPE_STATION:
1081                 ieee80211_sta_work(sdata);
1082                 break;
1083         case NL80211_IFTYPE_ADHOC:
1084                 ieee80211_ibss_work(sdata);
1085                 break;
1086         case NL80211_IFTYPE_MESH_POINT:
1087                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1088                         break;
1089                 ieee80211_mesh_work(sdata);
1090                 break;
1091         default:
1092                 break;
1093         }
1094 }
1095
1096
1097 /*
1098  * Helper function to initialise an interface to a specific type.
1099  */
1100 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1101                                   enum nl80211_iftype type)
1102 {
1103         /* clear type-dependent union */
1104         memset(&sdata->u, 0, sizeof(sdata->u));
1105
1106         /* and set some type-dependent values */
1107         sdata->vif.type = type;
1108         sdata->vif.p2p = false;
1109         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1110         sdata->wdev.iftype = type;
1111
1112         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1113         sdata->control_port_no_encrypt = false;
1114
1115         sdata->noack_map = 0;
1116
1117         /* only monitor differs */
1118         sdata->dev->type = ARPHRD_ETHER;
1119
1120         skb_queue_head_init(&sdata->skb_queue);
1121         INIT_WORK(&sdata->work, ieee80211_iface_work);
1122
1123         switch (type) {
1124         case NL80211_IFTYPE_P2P_GO:
1125                 type = NL80211_IFTYPE_AP;
1126                 sdata->vif.type = type;
1127                 sdata->vif.p2p = true;
1128                 /* fall through */
1129         case NL80211_IFTYPE_AP:
1130                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1131                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1132                 break;
1133         case NL80211_IFTYPE_P2P_CLIENT:
1134                 type = NL80211_IFTYPE_STATION;
1135                 sdata->vif.type = type;
1136                 sdata->vif.p2p = true;
1137                 /* fall through */
1138         case NL80211_IFTYPE_STATION:
1139                 ieee80211_sta_setup_sdata(sdata);
1140                 break;
1141         case NL80211_IFTYPE_ADHOC:
1142                 ieee80211_ibss_setup_sdata(sdata);
1143                 break;
1144         case NL80211_IFTYPE_MESH_POINT:
1145                 if (ieee80211_vif_is_mesh(&sdata->vif))
1146                         ieee80211_mesh_init_sdata(sdata);
1147                 break;
1148         case NL80211_IFTYPE_MONITOR:
1149                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1150                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1151                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1152                                       MONITOR_FLAG_OTHER_BSS;
1153                 break;
1154         case NL80211_IFTYPE_WDS:
1155         case NL80211_IFTYPE_AP_VLAN:
1156                 break;
1157         case NL80211_IFTYPE_UNSPECIFIED:
1158         case NUM_NL80211_IFTYPES:
1159                 BUG();
1160                 break;
1161         }
1162
1163         ieee80211_debugfs_add_netdev(sdata);
1164 }
1165
1166 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1167 {
1168         switch (sdata->vif.type) {
1169         case NL80211_IFTYPE_MESH_POINT:
1170                 mesh_path_flush_by_iface(sdata);
1171                 break;
1172
1173         default:
1174                 break;
1175         }
1176 }
1177
1178 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1179                                            enum nl80211_iftype type)
1180 {
1181         struct ieee80211_local *local = sdata->local;
1182         int ret, err;
1183         enum nl80211_iftype internal_type = type;
1184         bool p2p = false;
1185
1186         ASSERT_RTNL();
1187
1188         if (!local->ops->change_interface)
1189                 return -EBUSY;
1190
1191         switch (sdata->vif.type) {
1192         case NL80211_IFTYPE_AP:
1193         case NL80211_IFTYPE_STATION:
1194         case NL80211_IFTYPE_ADHOC:
1195                 /*
1196                  * Could maybe also all others here?
1197                  * Just not sure how that interacts
1198                  * with the RX/config path e.g. for
1199                  * mesh.
1200                  */
1201                 break;
1202         default:
1203                 return -EBUSY;
1204         }
1205
1206         switch (type) {
1207         case NL80211_IFTYPE_AP:
1208         case NL80211_IFTYPE_STATION:
1209         case NL80211_IFTYPE_ADHOC:
1210                 /*
1211                  * Could probably support everything
1212                  * but WDS here (WDS do_open can fail
1213                  * under memory pressure, which this
1214                  * code isn't prepared to handle).
1215                  */
1216                 break;
1217         case NL80211_IFTYPE_P2P_CLIENT:
1218                 p2p = true;
1219                 internal_type = NL80211_IFTYPE_STATION;
1220                 break;
1221         case NL80211_IFTYPE_P2P_GO:
1222                 p2p = true;
1223                 internal_type = NL80211_IFTYPE_AP;
1224                 break;
1225         default:
1226                 return -EBUSY;
1227         }
1228
1229         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1230         if (ret)
1231                 return ret;
1232
1233         ieee80211_do_stop(sdata, false);
1234
1235         ieee80211_teardown_sdata(sdata->dev);
1236
1237         ret = drv_change_interface(local, sdata, internal_type, p2p);
1238         if (ret)
1239                 type = sdata->vif.type;
1240
1241         /*
1242          * Ignore return value here, there's not much we can do since
1243          * the driver changed the interface type internally already.
1244          * The warnings will hopefully make driver authors fix it :-)
1245          */
1246         ieee80211_check_queues(sdata);
1247
1248         ieee80211_setup_sdata(sdata, type);
1249
1250         err = ieee80211_do_open(sdata->dev, false);
1251         WARN(err, "type change: do_open returned %d", err);
1252
1253         return ret;
1254 }
1255
1256 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1257                              enum nl80211_iftype type)
1258 {
1259         int ret;
1260
1261         ASSERT_RTNL();
1262
1263         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1264                 return 0;
1265
1266         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1267         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1268             type == NL80211_IFTYPE_ADHOC)
1269                 return -EOPNOTSUPP;
1270
1271         if (ieee80211_sdata_running(sdata)) {
1272                 ret = ieee80211_runtime_change_iftype(sdata, type);
1273                 if (ret)
1274                         return ret;
1275         } else {
1276                 /* Purge and reset type-dependent state. */
1277                 ieee80211_teardown_sdata(sdata->dev);
1278                 ieee80211_setup_sdata(sdata, type);
1279         }
1280
1281         /* reset some values that shouldn't be kept across type changes */
1282         sdata->vif.bss_conf.basic_rates =
1283                 ieee80211_mandatory_rates(sdata->local,
1284                         sdata->local->oper_channel->band);
1285         sdata->drop_unencrypted = 0;
1286         if (type == NL80211_IFTYPE_STATION)
1287                 sdata->u.mgd.use_4addr = false;
1288
1289         return 0;
1290 }
1291
1292 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1293                                        struct net_device *dev,
1294                                        enum nl80211_iftype type)
1295 {
1296         struct ieee80211_sub_if_data *sdata;
1297         u64 mask, start, addr, val, inc;
1298         u8 *m;
1299         u8 tmp_addr[ETH_ALEN];
1300         int i;
1301
1302         /* default ... something at least */
1303         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1304
1305         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1306             local->hw.wiphy->n_addresses <= 1)
1307                 return;
1308
1309
1310         mutex_lock(&local->iflist_mtx);
1311
1312         switch (type) {
1313         case NL80211_IFTYPE_MONITOR:
1314                 /* doesn't matter */
1315                 break;
1316         case NL80211_IFTYPE_WDS:
1317         case NL80211_IFTYPE_AP_VLAN:
1318                 /* match up with an AP interface */
1319                 list_for_each_entry(sdata, &local->interfaces, list) {
1320                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1321                                 continue;
1322                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1323                         break;
1324                 }
1325                 /* keep default if no AP interface present */
1326                 break;
1327         default:
1328                 /* assign a new address if possible -- try n_addresses first */
1329                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1330                         bool used = false;
1331
1332                         list_for_each_entry(sdata, &local->interfaces, list) {
1333                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1334                                            sdata->vif.addr, ETH_ALEN) == 0) {
1335                                         used = true;
1336                                         break;
1337                                 }
1338                         }
1339
1340                         if (!used) {
1341                                 memcpy(dev->perm_addr,
1342                                        local->hw.wiphy->addresses[i].addr,
1343                                        ETH_ALEN);
1344                                 break;
1345                         }
1346                 }
1347
1348                 /* try mask if available */
1349                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1350                         break;
1351
1352                 m = local->hw.wiphy->addr_mask;
1353                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1354                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1355                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1356
1357                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1358                         /* not a contiguous mask ... not handled now! */
1359                         pr_info("not contiguous\n");
1360                         break;
1361                 }
1362
1363                 m = local->hw.wiphy->perm_addr;
1364                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1365                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1366                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1367
1368                 inc = 1ULL<<__ffs64(mask);
1369                 val = (start & mask);
1370                 addr = (start & ~mask) | (val & mask);
1371                 do {
1372                         bool used = false;
1373
1374                         tmp_addr[5] = addr >> 0*8;
1375                         tmp_addr[4] = addr >> 1*8;
1376                         tmp_addr[3] = addr >> 2*8;
1377                         tmp_addr[2] = addr >> 3*8;
1378                         tmp_addr[1] = addr >> 4*8;
1379                         tmp_addr[0] = addr >> 5*8;
1380
1381                         val += inc;
1382
1383                         list_for_each_entry(sdata, &local->interfaces, list) {
1384                                 if (memcmp(tmp_addr, sdata->vif.addr,
1385                                                         ETH_ALEN) == 0) {
1386                                         used = true;
1387                                         break;
1388                                 }
1389                         }
1390
1391                         if (!used) {
1392                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1393                                 break;
1394                         }
1395                         addr = (start & ~mask) | (val & mask);
1396                 } while (addr != start);
1397
1398                 break;
1399         }
1400
1401         mutex_unlock(&local->iflist_mtx);
1402 }
1403
1404 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1405                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1406                      struct vif_params *params)
1407 {
1408         struct net_device *ndev;
1409         struct ieee80211_sub_if_data *sdata = NULL;
1410         int ret, i;
1411         int txqs = 1;
1412
1413         ASSERT_RTNL();
1414
1415         if (local->hw.queues >= IEEE80211_NUM_ACS)
1416                 txqs = IEEE80211_NUM_ACS;
1417
1418         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1419                                 name, ieee80211_if_setup, txqs, 1);
1420         if (!ndev)
1421                 return -ENOMEM;
1422         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1423
1424         ndev->needed_headroom = local->tx_headroom +
1425                                 4*6 /* four MAC addresses */
1426                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1427                                 + 6 /* mesh */
1428                                 + 8 /* rfc1042/bridge tunnel */
1429                                 - ETH_HLEN /* ethernet hard_header_len */
1430                                 + IEEE80211_ENCRYPT_HEADROOM;
1431         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1432
1433         ret = dev_alloc_name(ndev, ndev->name);
1434         if (ret < 0)
1435                 goto fail;
1436
1437         ieee80211_assign_perm_addr(local, ndev, type);
1438         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1439         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1440
1441         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1442         sdata = netdev_priv(ndev);
1443         ndev->ieee80211_ptr = &sdata->wdev;
1444         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1445         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1446
1447         /* initialise type-independent data */
1448         sdata->wdev.wiphy = local->hw.wiphy;
1449         sdata->local = local;
1450         sdata->dev = ndev;
1451 #ifdef CONFIG_INET
1452         sdata->arp_filter_state = true;
1453 #endif
1454
1455         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1456                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1457
1458         INIT_LIST_HEAD(&sdata->key_list);
1459
1460         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1461                 struct ieee80211_supported_band *sband;
1462                 sband = local->hw.wiphy->bands[i];
1463                 sdata->rc_rateidx_mask[i] =
1464                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1465                 if (sband)
1466                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1467                                sband->ht_cap.mcs.rx_mask,
1468                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1469                 else
1470                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1471                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1472         }
1473
1474         ieee80211_set_default_queues(sdata);
1475
1476         /* setup type-dependent data */
1477         ieee80211_setup_sdata(sdata, type);
1478
1479         if (params) {
1480                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1481                 if (type == NL80211_IFTYPE_STATION)
1482                         sdata->u.mgd.use_4addr = params->use_4addr;
1483         }
1484
1485         ndev->features |= local->hw.netdev_features;
1486
1487         ret = register_netdevice(ndev);
1488         if (ret)
1489                 goto fail;
1490
1491         mutex_lock(&local->iflist_mtx);
1492         list_add_tail_rcu(&sdata->list, &local->interfaces);
1493         mutex_unlock(&local->iflist_mtx);
1494
1495         if (new_wdev)
1496                 *new_wdev = &sdata->wdev;
1497
1498         return 0;
1499
1500  fail:
1501         free_netdev(ndev);
1502         return ret;
1503 }
1504
1505 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1506 {
1507         ASSERT_RTNL();
1508
1509         mutex_lock(&sdata->local->iflist_mtx);
1510         list_del_rcu(&sdata->list);
1511         mutex_unlock(&sdata->local->iflist_mtx);
1512
1513         /* clean up type-dependent data */
1514         ieee80211_clean_sdata(sdata);
1515
1516         synchronize_rcu();
1517         unregister_netdevice(sdata->dev);
1518 }
1519
1520 /*
1521  * Remove all interfaces, may only be called at hardware unregistration
1522  * time because it doesn't do RCU-safe list removals.
1523  */
1524 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1525 {
1526         struct ieee80211_sub_if_data *sdata, *tmp;
1527         LIST_HEAD(unreg_list);
1528
1529         ASSERT_RTNL();
1530
1531         mutex_lock(&local->iflist_mtx);
1532         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1533                 list_del(&sdata->list);
1534
1535                 ieee80211_clean_sdata(sdata);
1536
1537                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1538         }
1539         mutex_unlock(&local->iflist_mtx);
1540         unregister_netdevice_many(&unreg_list);
1541         list_del(&unreg_list);
1542 }
1543
1544 static int netdev_notify(struct notifier_block *nb,
1545                          unsigned long state,
1546                          void *ndev)
1547 {
1548         struct net_device *dev = ndev;
1549         struct ieee80211_sub_if_data *sdata;
1550
1551         if (state != NETDEV_CHANGENAME)
1552                 return 0;
1553
1554         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1555                 return 0;
1556
1557         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1558                 return 0;
1559
1560         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1561
1562         memcpy(sdata->name, dev->name, IFNAMSIZ);
1563
1564         ieee80211_debugfs_rename_netdev(sdata);
1565         return 0;
1566 }
1567
1568 static struct notifier_block mac80211_netdev_notifier = {
1569         .notifier_call = netdev_notify,
1570 };
1571
1572 int ieee80211_iface_init(void)
1573 {
1574         return register_netdevice_notifier(&mac80211_netdev_notifier);
1575 }
1576
1577 void ieee80211_iface_exit(void)
1578 {
1579         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1580 }