mac80211: handle TX power per virtual interface
[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->channel->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                               const char *reason)
83 {
84         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
85                 return 0;
86
87         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
88         return IEEE80211_CONF_CHANGE_IDLE;
89 }
90
91 static u32 ieee80211_idle_on(struct ieee80211_local *local)
92 {
93         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
94                 return 0;
95
96         drv_flush(local, false);
97
98         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
99         return IEEE80211_CONF_CHANGE_IDLE;
100 }
101
102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
103 {
104         struct ieee80211_sub_if_data *sdata;
105         int count = 0;
106         bool working = false, scanning = false;
107         unsigned int led_trig_start = 0, led_trig_stop = 0;
108         struct ieee80211_roc_work *roc;
109
110 #ifdef CONFIG_PROVE_LOCKING
111         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
112                 !lockdep_is_held(&local->iflist_mtx));
113 #endif
114         lockdep_assert_held(&local->mtx);
115
116         list_for_each_entry(sdata, &local->interfaces, list) {
117                 if (!ieee80211_sdata_running(sdata)) {
118                         sdata->vif.bss_conf.idle = true;
119                         continue;
120                 }
121
122                 sdata->old_idle = sdata->vif.bss_conf.idle;
123
124                 /* do not count disabled managed interfaces */
125                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
126                     !sdata->u.mgd.associated &&
127                     !sdata->u.mgd.auth_data &&
128                     !sdata->u.mgd.assoc_data) {
129                         sdata->vif.bss_conf.idle = true;
130                         continue;
131                 }
132                 /* do not count unused IBSS interfaces */
133                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
134                     !sdata->u.ibss.ssid_len) {
135                         sdata->vif.bss_conf.idle = true;
136                         continue;
137                 }
138
139                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
140                         continue;
141
142                 /* count everything else */
143                 sdata->vif.bss_conf.idle = false;
144                 count++;
145         }
146
147         if (!local->ops->remain_on_channel) {
148                 list_for_each_entry(roc, &local->roc_list, list) {
149                         working = true;
150                         roc->sdata->vif.bss_conf.idle = false;
151                 }
152         }
153
154         sdata = rcu_dereference_protected(local->scan_sdata,
155                                           lockdep_is_held(&local->mtx));
156         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
157                 scanning = true;
158                 sdata->vif.bss_conf.idle = false;
159         }
160
161         list_for_each_entry(sdata, &local->interfaces, list) {
162                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
163                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
164                     sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
165                         continue;
166                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
167                         continue;
168                 if (!ieee80211_sdata_running(sdata))
169                         continue;
170                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
171         }
172
173         if (working || scanning)
174                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
175         else
176                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
177
178         if (count)
179                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
180         else
181                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
182
183         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
184
185         if (working)
186                 return ieee80211_idle_off(local, "working");
187         if (scanning)
188                 return ieee80211_idle_off(local, "scanning");
189         if (!count)
190                 return ieee80211_idle_on(local);
191         else
192                 return ieee80211_idle_off(local, "in use");
193
194         return 0;
195 }
196
197 void ieee80211_recalc_idle(struct ieee80211_local *local)
198 {
199         u32 chg;
200
201         mutex_lock(&local->iflist_mtx);
202         chg = __ieee80211_recalc_idle(local);
203         mutex_unlock(&local->iflist_mtx);
204         if (chg)
205                 ieee80211_hw_config(local, chg);
206 }
207
208 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
209 {
210         int meshhdrlen;
211         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
212
213         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
214
215         /* FIX: what would be proper limits for MTU?
216          * This interface uses 802.3 frames. */
217         if (new_mtu < 256 ||
218             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
219                 return -EINVAL;
220         }
221
222         dev->mtu = new_mtu;
223         return 0;
224 }
225
226 static int ieee80211_change_mac(struct net_device *dev, void *addr)
227 {
228         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
229         struct sockaddr *sa = addr;
230         int ret;
231
232         if (ieee80211_sdata_running(sdata))
233                 return -EBUSY;
234
235         ret = eth_mac_addr(dev, sa);
236
237         if (ret == 0)
238                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
239
240         return ret;
241 }
242
243 static inline int identical_mac_addr_allowed(int type1, int type2)
244 {
245         return type1 == NL80211_IFTYPE_MONITOR ||
246                 type2 == NL80211_IFTYPE_MONITOR ||
247                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
248                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
249                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
250                 (type1 == NL80211_IFTYPE_WDS &&
251                         (type2 == NL80211_IFTYPE_WDS ||
252                          type2 == NL80211_IFTYPE_AP)) ||
253                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
254                 (type1 == NL80211_IFTYPE_AP_VLAN &&
255                         (type2 == NL80211_IFTYPE_AP ||
256                          type2 == NL80211_IFTYPE_AP_VLAN));
257 }
258
259 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
260                                             enum nl80211_iftype iftype)
261 {
262         struct ieee80211_local *local = sdata->local;
263         struct ieee80211_sub_if_data *nsdata;
264
265         ASSERT_RTNL();
266
267         /* we hold the RTNL here so can safely walk the list */
268         list_for_each_entry(nsdata, &local->interfaces, list) {
269                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
270                         /*
271                          * Allow only a single IBSS interface to be up at any
272                          * time. This is restricted because beacon distribution
273                          * cannot work properly if both are in the same IBSS.
274                          *
275                          * To remove this restriction we'd have to disallow them
276                          * from setting the same SSID on different IBSS interfaces
277                          * belonging to the same hardware. Then, however, we're
278                          * faced with having to adopt two different TSF timers...
279                          */
280                         if (iftype == NL80211_IFTYPE_ADHOC &&
281                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
282                                 return -EBUSY;
283
284                         /*
285                          * The remaining checks are only performed for interfaces
286                          * with the same MAC address.
287                          */
288                         if (!ether_addr_equal(sdata->vif.addr,
289                                               nsdata->vif.addr))
290                                 continue;
291
292                         /*
293                          * check whether it may have the same address
294                          */
295                         if (!identical_mac_addr_allowed(iftype,
296                                                         nsdata->vif.type))
297                                 return -ENOTUNIQ;
298
299                         /*
300                          * can only add VLANs to enabled APs
301                          */
302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
303                             nsdata->vif.type == NL80211_IFTYPE_AP)
304                                 sdata->bss = &nsdata->u.ap;
305                 }
306         }
307
308         return 0;
309 }
310
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
312 {
313         int n_queues = sdata->local->hw.queues;
314         int i;
315
316         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
317                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
318                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
319                                          IEEE80211_INVAL_HW_QUEUE))
320                                 return -EINVAL;
321                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
322                                          n_queues))
323                                 return -EINVAL;
324                 }
325         }
326
327         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
328             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
329                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
330                 return 0;
331         }
332
333         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
334                 return -EINVAL;
335
336         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
337                 return -EINVAL;
338
339         return 0;
340 }
341
342 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
343                                     const int offset)
344 {
345         struct ieee80211_local *local = sdata->local;
346         u32 flags = sdata->u.mntr_flags;
347
348 #define ADJUST(_f, _s)  do {                                    \
349         if (flags & MONITOR_FLAG_##_f)                          \
350                 local->fif_##_s += offset;                      \
351         } while (0)
352
353         ADJUST(FCSFAIL, fcsfail);
354         ADJUST(PLCPFAIL, plcpfail);
355         ADJUST(CONTROL, control);
356         ADJUST(CONTROL, pspoll);
357         ADJUST(OTHER_BSS, other_bss);
358
359 #undef ADJUST
360 }
361
362 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
363 {
364         struct ieee80211_local *local = sdata->local;
365         int i;
366
367         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
368                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
369                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
370                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
371                         sdata->vif.hw_queue[i] = i;
372                 else
373                         sdata->vif.hw_queue[i] = 0;
374         }
375         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
376 }
377
378 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
379 {
380         struct ieee80211_sub_if_data *sdata;
381         int ret = 0;
382
383         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
384                 return 0;
385
386         mutex_lock(&local->iflist_mtx);
387
388         if (local->monitor_sdata)
389                 goto out_unlock;
390
391         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
392         if (!sdata) {
393                 ret = -ENOMEM;
394                 goto out_unlock;
395         }
396
397         /* set up data */
398         sdata->local = local;
399         sdata->vif.type = NL80211_IFTYPE_MONITOR;
400         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
401                  wiphy_name(local->hw.wiphy));
402
403         ieee80211_set_default_queues(sdata);
404
405         ret = drv_add_interface(local, sdata);
406         if (WARN_ON(ret)) {
407                 /* ok .. stupid driver, it asked for this! */
408                 kfree(sdata);
409                 goto out_unlock;
410         }
411
412         ret = ieee80211_check_queues(sdata);
413         if (ret) {
414                 kfree(sdata);
415                 goto out_unlock;
416         }
417
418         ret = ieee80211_vif_use_channel(sdata, local->monitor_channel,
419                                         local->monitor_channel_type,
420                                         IEEE80211_CHANCTX_EXCLUSIVE);
421         if (ret) {
422                 drv_remove_interface(local, sdata);
423                 kfree(sdata);
424                 goto out_unlock;
425         }
426
427         rcu_assign_pointer(local->monitor_sdata, sdata);
428  out_unlock:
429         mutex_unlock(&local->iflist_mtx);
430         return ret;
431 }
432
433 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
434 {
435         struct ieee80211_sub_if_data *sdata;
436
437         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
438                 return;
439
440         mutex_lock(&local->iflist_mtx);
441
442         sdata = rcu_dereference_protected(local->monitor_sdata,
443                                           lockdep_is_held(&local->iflist_mtx));
444         if (!sdata)
445                 goto out_unlock;
446
447         rcu_assign_pointer(local->monitor_sdata, NULL);
448         synchronize_net();
449
450         ieee80211_vif_release_channel(sdata);
451
452         drv_remove_interface(local, sdata);
453
454         kfree(sdata);
455  out_unlock:
456         mutex_unlock(&local->iflist_mtx);
457 }
458
459 /*
460  * NOTE: Be very careful when changing this function, it must NOT return
461  * an error on interface type changes that have been pre-checked, so most
462  * checks should be in ieee80211_check_concurrent_iface.
463  */
464 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
465 {
466         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
467         struct net_device *dev = wdev->netdev;
468         struct ieee80211_local *local = sdata->local;
469         struct sta_info *sta;
470         u32 changed = 0;
471         int res;
472         u32 hw_reconf_flags = 0;
473
474         switch (sdata->vif.type) {
475         case NL80211_IFTYPE_WDS:
476                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
477                         return -ENOLINK;
478                 break;
479         case NL80211_IFTYPE_AP_VLAN: {
480                 struct ieee80211_sub_if_data *master;
481
482                 if (!sdata->bss)
483                         return -ENOLINK;
484
485                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
486
487                 master = container_of(sdata->bss,
488                                       struct ieee80211_sub_if_data, u.ap);
489                 sdata->control_port_protocol =
490                         master->control_port_protocol;
491                 sdata->control_port_no_encrypt =
492                         master->control_port_no_encrypt;
493                 break;
494                 }
495         case NL80211_IFTYPE_AP:
496                 sdata->bss = &sdata->u.ap;
497                 break;
498         case NL80211_IFTYPE_MESH_POINT:
499         case NL80211_IFTYPE_STATION:
500         case NL80211_IFTYPE_MONITOR:
501         case NL80211_IFTYPE_ADHOC:
502         case NL80211_IFTYPE_P2P_DEVICE:
503                 /* no special treatment */
504                 break;
505         case NL80211_IFTYPE_UNSPECIFIED:
506         case NUM_NL80211_IFTYPES:
507         case NL80211_IFTYPE_P2P_CLIENT:
508         case NL80211_IFTYPE_P2P_GO:
509                 /* cannot happen */
510                 WARN_ON(1);
511                 break;
512         }
513
514         if (local->open_count == 0) {
515                 res = drv_start(local);
516                 if (res)
517                         goto err_del_bss;
518                 if (local->ops->napi_poll)
519                         napi_enable(&local->napi);
520                 /* we're brought up, everything changes */
521                 hw_reconf_flags = ~0;
522                 ieee80211_led_radio(local, true);
523                 ieee80211_mod_tpt_led_trig(local,
524                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
525         }
526
527         /*
528          * Copy the hopefully now-present MAC address to
529          * this interface, if it has the special null one.
530          */
531         if (dev && is_zero_ether_addr(dev->dev_addr)) {
532                 memcpy(dev->dev_addr,
533                        local->hw.wiphy->perm_addr,
534                        ETH_ALEN);
535                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
536
537                 if (!is_valid_ether_addr(dev->dev_addr)) {
538                         res = -EADDRNOTAVAIL;
539                         goto err_stop;
540                 }
541         }
542
543         switch (sdata->vif.type) {
544         case NL80211_IFTYPE_AP_VLAN:
545                 /* no need to tell driver, but set carrier */
546                 if (rtnl_dereference(sdata->bss->beacon))
547                         netif_carrier_on(dev);
548                 else
549                         netif_carrier_off(dev);
550                 break;
551         case NL80211_IFTYPE_MONITOR:
552                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
553                         local->cooked_mntrs++;
554                         break;
555                 }
556
557                 if (local->monitors == 0 && local->open_count == 0) {
558                         res = ieee80211_add_virtual_monitor(local);
559                         if (res)
560                                 goto err_stop;
561                 }
562
563                 /* must be before the call to ieee80211_configure_filter */
564                 local->monitors++;
565                 if (local->monitors == 1) {
566                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
567                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
568                 }
569
570                 ieee80211_adjust_monitor_flags(sdata, 1);
571                 ieee80211_configure_filter(local);
572
573                 netif_carrier_on(dev);
574                 break;
575         default:
576                 if (coming_up) {
577                         ieee80211_del_virtual_monitor(local);
578
579                         res = drv_add_interface(local, sdata);
580                         if (res)
581                                 goto err_stop;
582                         res = ieee80211_check_queues(sdata);
583                         if (res)
584                                 goto err_del_interface;
585                 }
586
587                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
588                         local->fif_pspoll++;
589                         local->fif_probe_req++;
590
591                         ieee80211_configure_filter(local);
592                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
593                         local->fif_probe_req++;
594                 }
595
596                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
597                         changed |= ieee80211_reset_erp_info(sdata);
598                 ieee80211_bss_info_change_notify(sdata, changed);
599
600                 switch (sdata->vif.type) {
601                 case NL80211_IFTYPE_STATION:
602                 case NL80211_IFTYPE_ADHOC:
603                 case NL80211_IFTYPE_AP:
604                 case NL80211_IFTYPE_MESH_POINT:
605                         netif_carrier_off(dev);
606                         break;
607                 case NL80211_IFTYPE_WDS:
608                 case NL80211_IFTYPE_P2P_DEVICE:
609                         break;
610                 default:
611                         netif_carrier_on(dev);
612                 }
613
614                 /*
615                  * set default queue parameters so drivers don't
616                  * need to initialise the hardware if the hardware
617                  * doesn't start up with sane defaults
618                  */
619                 ieee80211_set_wmm_default(sdata, true);
620         }
621
622         set_bit(SDATA_STATE_RUNNING, &sdata->state);
623
624         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
625                 /* Create STA entry for the WDS peer */
626                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
627                                      GFP_KERNEL);
628                 if (!sta) {
629                         res = -ENOMEM;
630                         goto err_del_interface;
631                 }
632
633                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
634                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
635                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
636
637                 res = sta_info_insert(sta);
638                 if (res) {
639                         /* STA has been freed */
640                         goto err_del_interface;
641                 }
642
643                 rate_control_rate_init(sta);
644                 netif_carrier_on(dev);
645         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
646                 rcu_assign_pointer(local->p2p_sdata, sdata);
647         }
648
649         /*
650          * set_multicast_list will be invoked by the networking core
651          * which will check whether any increments here were done in
652          * error and sync them down to the hardware as filter flags.
653          */
654         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
655                 atomic_inc(&local->iff_allmultis);
656
657         if (sdata->flags & IEEE80211_SDATA_PROMISC)
658                 atomic_inc(&local->iff_promiscs);
659
660         mutex_lock(&local->mtx);
661         hw_reconf_flags |= __ieee80211_recalc_idle(local);
662         mutex_unlock(&local->mtx);
663
664         if (coming_up)
665                 local->open_count++;
666
667         if (hw_reconf_flags)
668                 ieee80211_hw_config(local, hw_reconf_flags);
669
670         ieee80211_recalc_ps(local, -1);
671
672         if (dev)
673                 netif_tx_start_all_queues(dev);
674
675         return 0;
676  err_del_interface:
677         drv_remove_interface(local, sdata);
678  err_stop:
679         if (!local->open_count)
680                 drv_stop(local);
681  err_del_bss:
682         sdata->bss = NULL;
683         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
684                 list_del(&sdata->u.vlan.list);
685         /* might already be clear but that doesn't matter */
686         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
687         return res;
688 }
689
690 static int ieee80211_open(struct net_device *dev)
691 {
692         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
693         int err;
694
695         /* fail early if user set an invalid address */
696         if (!is_valid_ether_addr(dev->dev_addr))
697                 return -EADDRNOTAVAIL;
698
699         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
700         if (err)
701                 return err;
702
703         return ieee80211_do_open(&sdata->wdev, true);
704 }
705
706 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
707                               bool going_down)
708 {
709         struct ieee80211_local *local = sdata->local;
710         unsigned long flags;
711         struct sk_buff *skb, *tmp;
712         u32 hw_reconf_flags = 0;
713         int i;
714
715         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
716
717         if (rcu_access_pointer(local->scan_sdata) == sdata)
718                 ieee80211_scan_cancel(local);
719
720         /*
721          * Stop TX on this interface first.
722          */
723         if (sdata->dev)
724                 netif_tx_stop_all_queues(sdata->dev);
725
726         ieee80211_roc_purge(sdata);
727
728         /*
729          * Remove all stations associated with this interface.
730          *
731          * This must be done before calling ops->remove_interface()
732          * because otherwise we can later invoke ops->sta_notify()
733          * whenever the STAs are removed, and that invalidates driver
734          * assumptions about always getting a vif pointer that is valid
735          * (because if we remove a STA after ops->remove_interface()
736          * the driver will have removed the vif info already!)
737          *
738          * This is relevant only in AP, WDS and mesh modes, since in
739          * all other modes we've already removed all stations when
740          * disconnecting etc.
741          */
742         sta_info_flush(local, sdata);
743
744         /*
745          * Don't count this interface for promisc/allmulti while it
746          * is down. dev_mc_unsync() will invoke set_multicast_list
747          * on the master interface which will sync these down to the
748          * hardware as filter flags.
749          */
750         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
751                 atomic_dec(&local->iff_allmultis);
752
753         if (sdata->flags & IEEE80211_SDATA_PROMISC)
754                 atomic_dec(&local->iff_promiscs);
755
756         if (sdata->vif.type == NL80211_IFTYPE_AP) {
757                 local->fif_pspoll--;
758                 local->fif_probe_req--;
759         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
760                 local->fif_probe_req--;
761         }
762
763         if (sdata->dev) {
764                 netif_addr_lock_bh(sdata->dev);
765                 spin_lock_bh(&local->filter_lock);
766                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
767                                  sdata->dev->addr_len);
768                 spin_unlock_bh(&local->filter_lock);
769                 netif_addr_unlock_bh(sdata->dev);
770
771                 ieee80211_configure_filter(local);
772         }
773
774         del_timer_sync(&local->dynamic_ps_timer);
775         cancel_work_sync(&local->dynamic_ps_enable_work);
776
777         cancel_work_sync(&sdata->recalc_smps);
778
779         /* APs need special treatment */
780         if (sdata->vif.type == NL80211_IFTYPE_AP) {
781                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
782
783                 /* down all dependent devices, that is VLANs */
784                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
785                                          u.vlan.list)
786                         dev_close(vlan->dev);
787                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
788         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
789                 ieee80211_mgd_stop(sdata);
790         }
791
792         if (going_down)
793                 local->open_count--;
794
795         switch (sdata->vif.type) {
796         case NL80211_IFTYPE_AP_VLAN:
797                 list_del(&sdata->u.vlan.list);
798                 /* no need to tell driver */
799                 break;
800         case NL80211_IFTYPE_MONITOR:
801                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
802                         local->cooked_mntrs--;
803                         break;
804                 }
805
806                 local->monitors--;
807                 if (local->monitors == 0) {
808                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
809                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
810                         ieee80211_del_virtual_monitor(local);
811                 }
812
813                 ieee80211_adjust_monitor_flags(sdata, -1);
814                 ieee80211_configure_filter(local);
815                 break;
816         case NL80211_IFTYPE_P2P_DEVICE:
817                 /* relies on synchronize_rcu() below */
818                 rcu_assign_pointer(local->p2p_sdata, NULL);
819                 /* fall through */
820         default:
821                 flush_work(&sdata->work);
822                 /*
823                  * When we get here, the interface is marked down.
824                  * Call rcu_barrier() to wait both for the RX path
825                  * should it be using the interface and enqueuing
826                  * frames at this very time on another CPU, and
827                  * for the sta free call_rcu callbacks.
828                  */
829                 rcu_barrier();
830
831                 /*
832                  * free_sta_rcu() enqueues a work for the actual
833                  * sta cleanup, so we need to flush it while
834                  * sdata is still valid.
835                  */
836                 flush_workqueue(local->workqueue);
837
838                 skb_queue_purge(&sdata->skb_queue);
839
840                 /*
841                  * Free all remaining keys, there shouldn't be any,
842                  * except maybe group keys in AP more or WDS?
843                  */
844                 ieee80211_free_keys(sdata);
845
846                 if (going_down)
847                         drv_remove_interface(local, sdata);
848         }
849
850         sdata->bss = NULL;
851
852         mutex_lock(&local->mtx);
853         hw_reconf_flags |= __ieee80211_recalc_idle(local);
854         mutex_unlock(&local->mtx);
855
856         ieee80211_recalc_ps(local, -1);
857
858         if (local->open_count == 0) {
859                 if (local->ops->napi_poll)
860                         napi_disable(&local->napi);
861                 ieee80211_clear_tx_pending(local);
862                 ieee80211_stop_device(local);
863
864                 /* no reconfiguring after stop! */
865                 hw_reconf_flags = 0;
866         }
867
868         /* do after stop to avoid reconfiguring when we stop anyway */
869         if (hw_reconf_flags)
870                 ieee80211_hw_config(local, hw_reconf_flags);
871
872         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
873         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
874                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
875                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
876                         if (info->control.vif == &sdata->vif) {
877                                 __skb_unlink(skb, &local->pending[i]);
878                                 ieee80211_free_txskb(&local->hw, skb);
879                         }
880                 }
881         }
882         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
883
884         if (local->monitors == local->open_count && local->monitors > 0)
885                 ieee80211_add_virtual_monitor(local);
886 }
887
888 static int ieee80211_stop(struct net_device *dev)
889 {
890         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
891
892         ieee80211_do_stop(sdata, true);
893
894         return 0;
895 }
896
897 static void ieee80211_set_multicast_list(struct net_device *dev)
898 {
899         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
900         struct ieee80211_local *local = sdata->local;
901         int allmulti, promisc, sdata_allmulti, sdata_promisc;
902
903         allmulti = !!(dev->flags & IFF_ALLMULTI);
904         promisc = !!(dev->flags & IFF_PROMISC);
905         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
906         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
907
908         if (allmulti != sdata_allmulti) {
909                 if (dev->flags & IFF_ALLMULTI)
910                         atomic_inc(&local->iff_allmultis);
911                 else
912                         atomic_dec(&local->iff_allmultis);
913                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
914         }
915
916         if (promisc != sdata_promisc) {
917                 if (dev->flags & IFF_PROMISC)
918                         atomic_inc(&local->iff_promiscs);
919                 else
920                         atomic_dec(&local->iff_promiscs);
921                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
922         }
923         spin_lock_bh(&local->filter_lock);
924         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
925         spin_unlock_bh(&local->filter_lock);
926         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
927 }
928
929 /*
930  * Called when the netdev is removed or, by the code below, before
931  * the interface type changes.
932  */
933 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
934 {
935         struct ieee80211_local *local = sdata->local;
936         int flushed;
937         int i;
938
939         /* free extra data */
940         ieee80211_free_keys(sdata);
941
942         ieee80211_debugfs_remove_netdev(sdata);
943
944         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
945                 __skb_queue_purge(&sdata->fragments[i].skb_list);
946         sdata->fragment_next = 0;
947
948         if (ieee80211_vif_is_mesh(&sdata->vif))
949                 mesh_rmc_free(sdata);
950
951         flushed = sta_info_flush(local, sdata);
952         WARN_ON(flushed);
953 }
954
955 static void ieee80211_uninit(struct net_device *dev)
956 {
957         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
958 }
959
960 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
961                                          struct sk_buff *skb)
962 {
963         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
964 }
965
966 static const struct net_device_ops ieee80211_dataif_ops = {
967         .ndo_open               = ieee80211_open,
968         .ndo_stop               = ieee80211_stop,
969         .ndo_uninit             = ieee80211_uninit,
970         .ndo_start_xmit         = ieee80211_subif_start_xmit,
971         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
972         .ndo_change_mtu         = ieee80211_change_mtu,
973         .ndo_set_mac_address    = ieee80211_change_mac,
974         .ndo_select_queue       = ieee80211_netdev_select_queue,
975 };
976
977 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
978                                           struct sk_buff *skb)
979 {
980         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
981         struct ieee80211_local *local = sdata->local;
982         struct ieee80211_hdr *hdr;
983         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
984
985         if (local->hw.queues < IEEE80211_NUM_ACS)
986                 return 0;
987
988         if (skb->len < 4 ||
989             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
990                 return 0; /* doesn't matter, frame will be dropped */
991
992         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
993
994         return ieee80211_select_queue_80211(sdata, skb, hdr);
995 }
996
997 static const struct net_device_ops ieee80211_monitorif_ops = {
998         .ndo_open               = ieee80211_open,
999         .ndo_stop               = ieee80211_stop,
1000         .ndo_uninit             = ieee80211_uninit,
1001         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1002         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1003         .ndo_change_mtu         = ieee80211_change_mtu,
1004         .ndo_set_mac_address    = eth_mac_addr,
1005         .ndo_select_queue       = ieee80211_monitor_select_queue,
1006 };
1007
1008 static void ieee80211_if_setup(struct net_device *dev)
1009 {
1010         ether_setup(dev);
1011         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1012         dev->netdev_ops = &ieee80211_dataif_ops;
1013         dev->destructor = free_netdev;
1014 }
1015
1016 static void ieee80211_iface_work(struct work_struct *work)
1017 {
1018         struct ieee80211_sub_if_data *sdata =
1019                 container_of(work, struct ieee80211_sub_if_data, work);
1020         struct ieee80211_local *local = sdata->local;
1021         struct sk_buff *skb;
1022         struct sta_info *sta;
1023         struct ieee80211_ra_tid *ra_tid;
1024
1025         if (!ieee80211_sdata_running(sdata))
1026                 return;
1027
1028         if (local->scanning)
1029                 return;
1030
1031         /*
1032          * ieee80211_queue_work() should have picked up most cases,
1033          * here we'll pick the rest.
1034          */
1035         if (WARN(local->suspended,
1036                  "interface work scheduled while going to suspend\n"))
1037                 return;
1038
1039         /* first process frames */
1040         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1041                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1042
1043                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1044                         ra_tid = (void *)&skb->cb;
1045                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1046                                                  ra_tid->tid);
1047                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1048                         ra_tid = (void *)&skb->cb;
1049                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1050                                                 ra_tid->tid);
1051                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1052                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1053                         int len = skb->len;
1054
1055                         mutex_lock(&local->sta_mtx);
1056                         sta = sta_info_get_bss(sdata, mgmt->sa);
1057                         if (sta) {
1058                                 switch (mgmt->u.action.u.addba_req.action_code) {
1059                                 case WLAN_ACTION_ADDBA_REQ:
1060                                         ieee80211_process_addba_request(
1061                                                         local, sta, mgmt, len);
1062                                         break;
1063                                 case WLAN_ACTION_ADDBA_RESP:
1064                                         ieee80211_process_addba_resp(local, sta,
1065                                                                      mgmt, len);
1066                                         break;
1067                                 case WLAN_ACTION_DELBA:
1068                                         ieee80211_process_delba(sdata, sta,
1069                                                                 mgmt, len);
1070                                         break;
1071                                 default:
1072                                         WARN_ON(1);
1073                                         break;
1074                                 }
1075                         }
1076                         mutex_unlock(&local->sta_mtx);
1077                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1078                         struct ieee80211_hdr *hdr = (void *)mgmt;
1079                         /*
1080                          * So the frame isn't mgmt, but frame_control
1081                          * is at the right place anyway, of course, so
1082                          * the if statement is correct.
1083                          *
1084                          * Warn if we have other data frame types here,
1085                          * they must not get here.
1086                          */
1087                         WARN_ON(hdr->frame_control &
1088                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1089                         WARN_ON(!(hdr->seq_ctrl &
1090                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1091                         /*
1092                          * This was a fragment of a frame, received while
1093                          * a block-ack session was active. That cannot be
1094                          * right, so terminate the session.
1095                          */
1096                         mutex_lock(&local->sta_mtx);
1097                         sta = sta_info_get_bss(sdata, mgmt->sa);
1098                         if (sta) {
1099                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1100                                                 IEEE80211_QOS_CTL_TID_MASK;
1101
1102                                 __ieee80211_stop_rx_ba_session(
1103                                         sta, tid, WLAN_BACK_RECIPIENT,
1104                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1105                                         true);
1106                         }
1107                         mutex_unlock(&local->sta_mtx);
1108                 } else switch (sdata->vif.type) {
1109                 case NL80211_IFTYPE_STATION:
1110                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1111                         break;
1112                 case NL80211_IFTYPE_ADHOC:
1113                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1114                         break;
1115                 case NL80211_IFTYPE_MESH_POINT:
1116                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1117                                 break;
1118                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1119                         break;
1120                 default:
1121                         WARN(1, "frame for unexpected interface type");
1122                         break;
1123                 }
1124
1125                 kfree_skb(skb);
1126         }
1127
1128         /* then other type-dependent work */
1129         switch (sdata->vif.type) {
1130         case NL80211_IFTYPE_STATION:
1131                 ieee80211_sta_work(sdata);
1132                 break;
1133         case NL80211_IFTYPE_ADHOC:
1134                 ieee80211_ibss_work(sdata);
1135                 break;
1136         case NL80211_IFTYPE_MESH_POINT:
1137                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1138                         break;
1139                 ieee80211_mesh_work(sdata);
1140                 break;
1141         default:
1142                 break;
1143         }
1144 }
1145
1146 static void ieee80211_recalc_smps_work(struct work_struct *work)
1147 {
1148         struct ieee80211_sub_if_data *sdata =
1149                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1150
1151         ieee80211_recalc_smps(sdata);
1152 }
1153
1154 /*
1155  * Helper function to initialise an interface to a specific type.
1156  */
1157 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1158                                   enum nl80211_iftype type)
1159 {
1160         /* clear type-dependent union */
1161         memset(&sdata->u, 0, sizeof(sdata->u));
1162
1163         /* and set some type-dependent values */
1164         sdata->vif.type = type;
1165         sdata->vif.p2p = false;
1166         sdata->wdev.iftype = type;
1167
1168         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1169         sdata->control_port_no_encrypt = false;
1170
1171         sdata->noack_map = 0;
1172
1173         /* only monitor/p2p-device differ */
1174         if (sdata->dev) {
1175                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1176                 sdata->dev->type = ARPHRD_ETHER;
1177         }
1178
1179         skb_queue_head_init(&sdata->skb_queue);
1180         INIT_WORK(&sdata->work, ieee80211_iface_work);
1181         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1182
1183         switch (type) {
1184         case NL80211_IFTYPE_P2P_GO:
1185                 type = NL80211_IFTYPE_AP;
1186                 sdata->vif.type = type;
1187                 sdata->vif.p2p = true;
1188                 /* fall through */
1189         case NL80211_IFTYPE_AP:
1190                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1191                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1192                 break;
1193         case NL80211_IFTYPE_P2P_CLIENT:
1194                 type = NL80211_IFTYPE_STATION;
1195                 sdata->vif.type = type;
1196                 sdata->vif.p2p = true;
1197                 /* fall through */
1198         case NL80211_IFTYPE_STATION:
1199                 ieee80211_sta_setup_sdata(sdata);
1200                 break;
1201         case NL80211_IFTYPE_ADHOC:
1202                 ieee80211_ibss_setup_sdata(sdata);
1203                 break;
1204         case NL80211_IFTYPE_MESH_POINT:
1205                 if (ieee80211_vif_is_mesh(&sdata->vif))
1206                         ieee80211_mesh_init_sdata(sdata);
1207                 break;
1208         case NL80211_IFTYPE_MONITOR:
1209                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1210                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1211                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1212                                       MONITOR_FLAG_OTHER_BSS;
1213                 break;
1214         case NL80211_IFTYPE_WDS:
1215         case NL80211_IFTYPE_AP_VLAN:
1216         case NL80211_IFTYPE_P2P_DEVICE:
1217                 break;
1218         case NL80211_IFTYPE_UNSPECIFIED:
1219         case NUM_NL80211_IFTYPES:
1220                 BUG();
1221                 break;
1222         }
1223
1224         ieee80211_debugfs_add_netdev(sdata);
1225 }
1226
1227 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1228                                            enum nl80211_iftype type)
1229 {
1230         struct ieee80211_local *local = sdata->local;
1231         int ret, err;
1232         enum nl80211_iftype internal_type = type;
1233         bool p2p = false;
1234
1235         ASSERT_RTNL();
1236
1237         if (!local->ops->change_interface)
1238                 return -EBUSY;
1239
1240         switch (sdata->vif.type) {
1241         case NL80211_IFTYPE_AP:
1242         case NL80211_IFTYPE_STATION:
1243         case NL80211_IFTYPE_ADHOC:
1244                 /*
1245                  * Could maybe also all others here?
1246                  * Just not sure how that interacts
1247                  * with the RX/config path e.g. for
1248                  * mesh.
1249                  */
1250                 break;
1251         default:
1252                 return -EBUSY;
1253         }
1254
1255         switch (type) {
1256         case NL80211_IFTYPE_AP:
1257         case NL80211_IFTYPE_STATION:
1258         case NL80211_IFTYPE_ADHOC:
1259                 /*
1260                  * Could probably support everything
1261                  * but WDS here (WDS do_open can fail
1262                  * under memory pressure, which this
1263                  * code isn't prepared to handle).
1264                  */
1265                 break;
1266         case NL80211_IFTYPE_P2P_CLIENT:
1267                 p2p = true;
1268                 internal_type = NL80211_IFTYPE_STATION;
1269                 break;
1270         case NL80211_IFTYPE_P2P_GO:
1271                 p2p = true;
1272                 internal_type = NL80211_IFTYPE_AP;
1273                 break;
1274         default:
1275                 return -EBUSY;
1276         }
1277
1278         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1279         if (ret)
1280                 return ret;
1281
1282         ieee80211_do_stop(sdata, false);
1283
1284         ieee80211_teardown_sdata(sdata);
1285
1286         ret = drv_change_interface(local, sdata, internal_type, p2p);
1287         if (ret)
1288                 type = sdata->vif.type;
1289
1290         /*
1291          * Ignore return value here, there's not much we can do since
1292          * the driver changed the interface type internally already.
1293          * The warnings will hopefully make driver authors fix it :-)
1294          */
1295         ieee80211_check_queues(sdata);
1296
1297         ieee80211_setup_sdata(sdata, type);
1298
1299         err = ieee80211_do_open(&sdata->wdev, false);
1300         WARN(err, "type change: do_open returned %d", err);
1301
1302         return ret;
1303 }
1304
1305 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1306                              enum nl80211_iftype type)
1307 {
1308         int ret;
1309
1310         ASSERT_RTNL();
1311
1312         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1313                 return 0;
1314
1315         if (ieee80211_sdata_running(sdata)) {
1316                 ret = ieee80211_runtime_change_iftype(sdata, type);
1317                 if (ret)
1318                         return ret;
1319         } else {
1320                 /* Purge and reset type-dependent state. */
1321                 ieee80211_teardown_sdata(sdata);
1322                 ieee80211_setup_sdata(sdata, type);
1323         }
1324
1325         /* reset some values that shouldn't be kept across type changes */
1326         sdata->drop_unencrypted = 0;
1327         if (type == NL80211_IFTYPE_STATION)
1328                 sdata->u.mgd.use_4addr = false;
1329
1330         return 0;
1331 }
1332
1333 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1334                                        u8 *perm_addr, enum nl80211_iftype type)
1335 {
1336         struct ieee80211_sub_if_data *sdata;
1337         u64 mask, start, addr, val, inc;
1338         u8 *m;
1339         u8 tmp_addr[ETH_ALEN];
1340         int i;
1341
1342         /* default ... something at least */
1343         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1344
1345         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1346             local->hw.wiphy->n_addresses <= 1)
1347                 return;
1348
1349         mutex_lock(&local->iflist_mtx);
1350
1351         switch (type) {
1352         case NL80211_IFTYPE_MONITOR:
1353                 /* doesn't matter */
1354                 break;
1355         case NL80211_IFTYPE_WDS:
1356         case NL80211_IFTYPE_AP_VLAN:
1357                 /* match up with an AP interface */
1358                 list_for_each_entry(sdata, &local->interfaces, list) {
1359                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1360                                 continue;
1361                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1362                         break;
1363                 }
1364                 /* keep default if no AP interface present */
1365                 break;
1366         case NL80211_IFTYPE_P2P_CLIENT:
1367         case NL80211_IFTYPE_P2P_GO:
1368                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1369                         list_for_each_entry(sdata, &local->interfaces, list) {
1370                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1371                                         continue;
1372                                 if (!ieee80211_sdata_running(sdata))
1373                                         continue;
1374                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1375                                 goto out_unlock;
1376                         }
1377                 }
1378                 /* otherwise fall through */
1379         default:
1380                 /* assign a new address if possible -- try n_addresses first */
1381                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1382                         bool used = false;
1383
1384                         list_for_each_entry(sdata, &local->interfaces, list) {
1385                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1386                                            sdata->vif.addr, ETH_ALEN) == 0) {
1387                                         used = true;
1388                                         break;
1389                                 }
1390                         }
1391
1392                         if (!used) {
1393                                 memcpy(perm_addr,
1394                                        local->hw.wiphy->addresses[i].addr,
1395                                        ETH_ALEN);
1396                                 break;
1397                         }
1398                 }
1399
1400                 /* try mask if available */
1401                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1402                         break;
1403
1404                 m = local->hw.wiphy->addr_mask;
1405                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1406                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1407                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1408
1409                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1410                         /* not a contiguous mask ... not handled now! */
1411                         pr_info("not contiguous\n");
1412                         break;
1413                 }
1414
1415                 m = local->hw.wiphy->perm_addr;
1416                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1417                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1418                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1419
1420                 inc = 1ULL<<__ffs64(mask);
1421                 val = (start & mask);
1422                 addr = (start & ~mask) | (val & mask);
1423                 do {
1424                         bool used = false;
1425
1426                         tmp_addr[5] = addr >> 0*8;
1427                         tmp_addr[4] = addr >> 1*8;
1428                         tmp_addr[3] = addr >> 2*8;
1429                         tmp_addr[2] = addr >> 3*8;
1430                         tmp_addr[1] = addr >> 4*8;
1431                         tmp_addr[0] = addr >> 5*8;
1432
1433                         val += inc;
1434
1435                         list_for_each_entry(sdata, &local->interfaces, list) {
1436                                 if (memcmp(tmp_addr, sdata->vif.addr,
1437                                                         ETH_ALEN) == 0) {
1438                                         used = true;
1439                                         break;
1440                                 }
1441                         }
1442
1443                         if (!used) {
1444                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1445                                 break;
1446                         }
1447                         addr = (start & ~mask) | (val & mask);
1448                 } while (addr != start);
1449
1450                 break;
1451         }
1452
1453  out_unlock:
1454         mutex_unlock(&local->iflist_mtx);
1455 }
1456
1457 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1458                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1459                      struct vif_params *params)
1460 {
1461         struct net_device *ndev = NULL;
1462         struct ieee80211_sub_if_data *sdata = NULL;
1463         int ret, i;
1464         int txqs = 1;
1465
1466         ASSERT_RTNL();
1467
1468         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1469                 struct wireless_dev *wdev;
1470
1471                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1472                                 GFP_KERNEL);
1473                 if (!sdata)
1474                         return -ENOMEM;
1475                 wdev = &sdata->wdev;
1476
1477                 sdata->dev = NULL;
1478                 strlcpy(sdata->name, name, IFNAMSIZ);
1479                 ieee80211_assign_perm_addr(local, wdev->address, type);
1480                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1481         } else {
1482                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1483                         txqs = IEEE80211_NUM_ACS;
1484
1485                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1486                                         local->hw.vif_data_size,
1487                                         name, ieee80211_if_setup, txqs, 1);
1488                 if (!ndev)
1489                         return -ENOMEM;
1490                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1491
1492                 ndev->needed_headroom = local->tx_headroom +
1493                                         4*6 /* four MAC addresses */
1494                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1495                                         + 6 /* mesh */
1496                                         + 8 /* rfc1042/bridge tunnel */
1497                                         - ETH_HLEN /* ethernet hard_header_len */
1498                                         + IEEE80211_ENCRYPT_HEADROOM;
1499                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1500
1501                 ret = dev_alloc_name(ndev, ndev->name);
1502                 if (ret < 0) {
1503                         free_netdev(ndev);
1504                         return ret;
1505                 }
1506
1507                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1508                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1509                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1510
1511                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1512                 sdata = netdev_priv(ndev);
1513                 ndev->ieee80211_ptr = &sdata->wdev;
1514                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1515                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1516
1517                 sdata->dev = ndev;
1518         }
1519
1520         /* initialise type-independent data */
1521         sdata->wdev.wiphy = local->hw.wiphy;
1522         sdata->local = local;
1523 #ifdef CONFIG_INET
1524         sdata->arp_filter_state = true;
1525 #endif
1526
1527         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1528                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1529
1530         INIT_LIST_HEAD(&sdata->key_list);
1531
1532         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1533                 struct ieee80211_supported_band *sband;
1534                 sband = local->hw.wiphy->bands[i];
1535                 sdata->rc_rateidx_mask[i] =
1536                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1537                 if (sband)
1538                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1539                                sband->ht_cap.mcs.rx_mask,
1540                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1541                 else
1542                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1543                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1544         }
1545
1546         ieee80211_set_default_queues(sdata);
1547
1548         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1549         sdata->user_power_level = local->user_power_level;
1550
1551         /* setup type-dependent data */
1552         ieee80211_setup_sdata(sdata, type);
1553
1554         if (ndev) {
1555                 if (params) {
1556                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1557                         if (type == NL80211_IFTYPE_STATION)
1558                                 sdata->u.mgd.use_4addr = params->use_4addr;
1559                 }
1560
1561                 ndev->features |= local->hw.netdev_features;
1562
1563                 ret = register_netdevice(ndev);
1564                 if (ret) {
1565                         free_netdev(ndev);
1566                         return ret;
1567                 }
1568         }
1569
1570         mutex_lock(&local->iflist_mtx);
1571         list_add_tail_rcu(&sdata->list, &local->interfaces);
1572         mutex_unlock(&local->iflist_mtx);
1573
1574         if (new_wdev)
1575                 *new_wdev = &sdata->wdev;
1576
1577         return 0;
1578 }
1579
1580 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1581 {
1582         ASSERT_RTNL();
1583
1584         mutex_lock(&sdata->local->iflist_mtx);
1585         list_del_rcu(&sdata->list);
1586         mutex_unlock(&sdata->local->iflist_mtx);
1587
1588         synchronize_rcu();
1589
1590         if (sdata->dev) {
1591                 unregister_netdevice(sdata->dev);
1592         } else {
1593                 cfg80211_unregister_wdev(&sdata->wdev);
1594                 kfree(sdata);
1595         }
1596 }
1597
1598 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1599 {
1600         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1601                 return;
1602         ieee80211_do_stop(sdata, true);
1603         ieee80211_teardown_sdata(sdata);
1604 }
1605
1606 /*
1607  * Remove all interfaces, may only be called at hardware unregistration
1608  * time because it doesn't do RCU-safe list removals.
1609  */
1610 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1611 {
1612         struct ieee80211_sub_if_data *sdata, *tmp;
1613         LIST_HEAD(unreg_list);
1614         LIST_HEAD(wdev_list);
1615
1616         ASSERT_RTNL();
1617
1618         mutex_lock(&local->iflist_mtx);
1619         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1620                 list_del(&sdata->list);
1621
1622                 if (sdata->dev)
1623                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1624                 else
1625                         list_add(&sdata->list, &wdev_list);
1626         }
1627         mutex_unlock(&local->iflist_mtx);
1628         unregister_netdevice_many(&unreg_list);
1629         list_del(&unreg_list);
1630
1631         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1632                 list_del(&sdata->list);
1633                 cfg80211_unregister_wdev(&sdata->wdev);
1634                 kfree(sdata);
1635         }
1636 }
1637
1638 static int netdev_notify(struct notifier_block *nb,
1639                          unsigned long state,
1640                          void *ndev)
1641 {
1642         struct net_device *dev = ndev;
1643         struct ieee80211_sub_if_data *sdata;
1644
1645         if (state != NETDEV_CHANGENAME)
1646                 return 0;
1647
1648         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1649                 return 0;
1650
1651         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1652                 return 0;
1653
1654         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1655
1656         memcpy(sdata->name, dev->name, IFNAMSIZ);
1657
1658         ieee80211_debugfs_rename_netdev(sdata);
1659         return 0;
1660 }
1661
1662 static struct notifier_block mac80211_netdev_notifier = {
1663         .notifier_call = netdev_notify,
1664 };
1665
1666 int ieee80211_iface_init(void)
1667 {
1668         return register_netdevice_notifier(&mac80211_netdev_notifier);
1669 }
1670
1671 void ieee80211_iface_exit(void)
1672 {
1673         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1674 }