mac80211: optimise AP stop RCU handling
[linux-3.10.git] / net / mac80211 / iface.c
1 /*
2  * Interface handling (except master interface)
3  *
4  * Copyright 2002-2005, Instant802 Networks, Inc.
5  * Copyright 2005-2006, Devicescape Software, Inc.
6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30  * DOC: Interface list locking
31  *
32  * The interface list in each struct ieee80211_local is protected
33  * three-fold:
34  *
35  * (1) modifications may only be done under the RTNL
36  * (2) modifications and readers are protected against each other by
37  *     the iflist_mtx.
38  * (3) modifications are done in an RCU manner so atomic readers
39  *     can traverse the list in RCU-safe blocks.
40  *
41  * As a consequence, reads (traversals) of the list can be protected
42  * by either the RTNL, the iflist_mtx or RCU.
43  */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47         struct ieee80211_chanctx_conf *chanctx_conf;
48         int power;
49
50         rcu_read_lock();
51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52         if (!chanctx_conf) {
53                 rcu_read_unlock();
54                 return false;
55         }
56
57         power = chanctx_conf->def.chan->max_power;
58         rcu_read_unlock();
59
60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61                 power = min(power, sdata->user_power_level);
62
63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64                 power = min(power, sdata->ap_power_level);
65
66         if (power != sdata->vif.bss_conf.txpower) {
67                 sdata->vif.bss_conf.txpower = power;
68                 ieee80211_hw_config(sdata->local, 0);
69                 return true;
70         }
71
72         return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77         if (__ieee80211_recalc_txpower(sdata))
78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 ieee80211_idle_off(struct ieee80211_local *local,
82                               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         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
211                 return -EINVAL;
212
213         dev->mtu = new_mtu;
214         return 0;
215 }
216
217 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
218 {
219         struct ieee80211_sub_if_data *sdata;
220         u64 new, mask, tmp;
221         u8 *m;
222         int ret = 0;
223
224         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
225                 return 0;
226
227         m = addr;
228         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
229                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
230                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
231
232         m = local->hw.wiphy->addr_mask;
233         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
234                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
235                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
236
237
238         mutex_lock(&local->iflist_mtx);
239         list_for_each_entry(sdata, &local->interfaces, list) {
240                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
241                         continue;
242
243                 m = sdata->vif.addr;
244                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
245                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
246                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
247
248                 if ((new & ~mask) != (tmp & ~mask)) {
249                         ret = -EINVAL;
250                         break;
251                 }
252         }
253         mutex_unlock(&local->iflist_mtx);
254
255         return ret;
256 }
257
258 static int ieee80211_change_mac(struct net_device *dev, void *addr)
259 {
260         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
261         struct sockaddr *sa = addr;
262         int ret;
263
264         if (ieee80211_sdata_running(sdata))
265                 return -EBUSY;
266
267         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
268         if (ret)
269                 return ret;
270
271         ret = eth_mac_addr(dev, sa);
272
273         if (ret == 0)
274                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
275
276         return ret;
277 }
278
279 static inline int identical_mac_addr_allowed(int type1, int type2)
280 {
281         return type1 == NL80211_IFTYPE_MONITOR ||
282                 type2 == NL80211_IFTYPE_MONITOR ||
283                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
284                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
285                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
286                 (type1 == NL80211_IFTYPE_WDS &&
287                         (type2 == NL80211_IFTYPE_WDS ||
288                          type2 == NL80211_IFTYPE_AP)) ||
289                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
290                 (type1 == NL80211_IFTYPE_AP_VLAN &&
291                         (type2 == NL80211_IFTYPE_AP ||
292                          type2 == NL80211_IFTYPE_AP_VLAN));
293 }
294
295 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
296                                             enum nl80211_iftype iftype)
297 {
298         struct ieee80211_local *local = sdata->local;
299         struct ieee80211_sub_if_data *nsdata;
300
301         ASSERT_RTNL();
302
303         /* we hold the RTNL here so can safely walk the list */
304         list_for_each_entry(nsdata, &local->interfaces, list) {
305                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
306                         /*
307                          * Allow only a single IBSS interface to be up at any
308                          * time. This is restricted because beacon distribution
309                          * cannot work properly if both are in the same IBSS.
310                          *
311                          * To remove this restriction we'd have to disallow them
312                          * from setting the same SSID on different IBSS interfaces
313                          * belonging to the same hardware. Then, however, we're
314                          * faced with having to adopt two different TSF timers...
315                          */
316                         if (iftype == NL80211_IFTYPE_ADHOC &&
317                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
318                                 return -EBUSY;
319
320                         /*
321                          * The remaining checks are only performed for interfaces
322                          * with the same MAC address.
323                          */
324                         if (!ether_addr_equal(sdata->vif.addr,
325                                               nsdata->vif.addr))
326                                 continue;
327
328                         /*
329                          * check whether it may have the same address
330                          */
331                         if (!identical_mac_addr_allowed(iftype,
332                                                         nsdata->vif.type))
333                                 return -ENOTUNIQ;
334
335                         /*
336                          * can only add VLANs to enabled APs
337                          */
338                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
339                             nsdata->vif.type == NL80211_IFTYPE_AP)
340                                 sdata->bss = &nsdata->u.ap;
341                 }
342         }
343
344         return 0;
345 }
346
347 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
348 {
349         int n_queues = sdata->local->hw.queues;
350         int i;
351
352         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
353                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
354                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
355                                          IEEE80211_INVAL_HW_QUEUE))
356                                 return -EINVAL;
357                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
358                                          n_queues))
359                                 return -EINVAL;
360                 }
361         }
362
363         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
364             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
365                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
366                 return 0;
367         }
368
369         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
370                 return -EINVAL;
371
372         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
373                 return -EINVAL;
374
375         return 0;
376 }
377
378 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
379                                     const int offset)
380 {
381         struct ieee80211_local *local = sdata->local;
382         u32 flags = sdata->u.mntr_flags;
383
384 #define ADJUST(_f, _s)  do {                                    \
385         if (flags & MONITOR_FLAG_##_f)                          \
386                 local->fif_##_s += offset;                      \
387         } while (0)
388
389         ADJUST(FCSFAIL, fcsfail);
390         ADJUST(PLCPFAIL, plcpfail);
391         ADJUST(CONTROL, control);
392         ADJUST(CONTROL, pspoll);
393         ADJUST(OTHER_BSS, other_bss);
394
395 #undef ADJUST
396 }
397
398 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
399 {
400         struct ieee80211_local *local = sdata->local;
401         int i;
402
403         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
404                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
405                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
406                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
407                         sdata->vif.hw_queue[i] = i;
408                 else
409                         sdata->vif.hw_queue[i] = 0;
410         }
411         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
412 }
413
414 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
415 {
416         struct ieee80211_sub_if_data *sdata;
417         int ret = 0;
418
419         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
420                 return 0;
421
422         mutex_lock(&local->iflist_mtx);
423
424         if (local->monitor_sdata)
425                 goto out_unlock;
426
427         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
428         if (!sdata) {
429                 ret = -ENOMEM;
430                 goto out_unlock;
431         }
432
433         /* set up data */
434         sdata->local = local;
435         sdata->vif.type = NL80211_IFTYPE_MONITOR;
436         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
437                  wiphy_name(local->hw.wiphy));
438
439         ieee80211_set_default_queues(sdata);
440
441         ret = drv_add_interface(local, sdata);
442         if (WARN_ON(ret)) {
443                 /* ok .. stupid driver, it asked for this! */
444                 kfree(sdata);
445                 goto out_unlock;
446         }
447
448         ret = ieee80211_check_queues(sdata);
449         if (ret) {
450                 kfree(sdata);
451                 goto out_unlock;
452         }
453
454         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
455                                         IEEE80211_CHANCTX_EXCLUSIVE);
456         if (ret) {
457                 drv_remove_interface(local, sdata);
458                 kfree(sdata);
459                 goto out_unlock;
460         }
461
462         rcu_assign_pointer(local->monitor_sdata, sdata);
463  out_unlock:
464         mutex_unlock(&local->iflist_mtx);
465         return ret;
466 }
467
468 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
469 {
470         struct ieee80211_sub_if_data *sdata;
471
472         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
473                 return;
474
475         mutex_lock(&local->iflist_mtx);
476
477         sdata = rcu_dereference_protected(local->monitor_sdata,
478                                           lockdep_is_held(&local->iflist_mtx));
479         if (!sdata)
480                 goto out_unlock;
481
482         rcu_assign_pointer(local->monitor_sdata, NULL);
483         synchronize_net();
484
485         ieee80211_vif_release_channel(sdata);
486
487         drv_remove_interface(local, sdata);
488
489         kfree(sdata);
490  out_unlock:
491         mutex_unlock(&local->iflist_mtx);
492 }
493
494 /*
495  * NOTE: Be very careful when changing this function, it must NOT return
496  * an error on interface type changes that have been pre-checked, so most
497  * checks should be in ieee80211_check_concurrent_iface.
498  */
499 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
500 {
501         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
502         struct net_device *dev = wdev->netdev;
503         struct ieee80211_local *local = sdata->local;
504         struct sta_info *sta;
505         u32 changed = 0;
506         int res;
507         u32 hw_reconf_flags = 0;
508
509         switch (sdata->vif.type) {
510         case NL80211_IFTYPE_WDS:
511                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
512                         return -ENOLINK;
513                 break;
514         case NL80211_IFTYPE_AP_VLAN: {
515                 struct ieee80211_sub_if_data *master;
516
517                 if (!sdata->bss)
518                         return -ENOLINK;
519
520                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
521
522                 master = container_of(sdata->bss,
523                                       struct ieee80211_sub_if_data, u.ap);
524                 sdata->control_port_protocol =
525                         master->control_port_protocol;
526                 sdata->control_port_no_encrypt =
527                         master->control_port_no_encrypt;
528                 break;
529                 }
530         case NL80211_IFTYPE_AP:
531                 sdata->bss = &sdata->u.ap;
532                 break;
533         case NL80211_IFTYPE_MESH_POINT:
534         case NL80211_IFTYPE_STATION:
535         case NL80211_IFTYPE_MONITOR:
536         case NL80211_IFTYPE_ADHOC:
537         case NL80211_IFTYPE_P2P_DEVICE:
538                 /* no special treatment */
539                 break;
540         case NL80211_IFTYPE_UNSPECIFIED:
541         case NUM_NL80211_IFTYPES:
542         case NL80211_IFTYPE_P2P_CLIENT:
543         case NL80211_IFTYPE_P2P_GO:
544                 /* cannot happen */
545                 WARN_ON(1);
546                 break;
547         }
548
549         if (local->open_count == 0) {
550                 res = drv_start(local);
551                 if (res)
552                         goto err_del_bss;
553                 if (local->ops->napi_poll)
554                         napi_enable(&local->napi);
555                 /* we're brought up, everything changes */
556                 hw_reconf_flags = ~0;
557                 ieee80211_led_radio(local, true);
558                 ieee80211_mod_tpt_led_trig(local,
559                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
560         }
561
562         /*
563          * Copy the hopefully now-present MAC address to
564          * this interface, if it has the special null one.
565          */
566         if (dev && is_zero_ether_addr(dev->dev_addr)) {
567                 memcpy(dev->dev_addr,
568                        local->hw.wiphy->perm_addr,
569                        ETH_ALEN);
570                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
571
572                 if (!is_valid_ether_addr(dev->dev_addr)) {
573                         res = -EADDRNOTAVAIL;
574                         goto err_stop;
575                 }
576         }
577
578         switch (sdata->vif.type) {
579         case NL80211_IFTYPE_AP_VLAN:
580                 /* no need to tell driver, but set carrier and chanctx */
581                 if (rtnl_dereference(sdata->bss->beacon)) {
582                         ieee80211_vif_vlan_copy_chanctx(sdata);
583                         netif_carrier_on(dev);
584                 } else {
585                         netif_carrier_off(dev);
586                 }
587                 break;
588         case NL80211_IFTYPE_MONITOR:
589                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
590                         local->cooked_mntrs++;
591                         break;
592                 }
593
594                 if (local->monitors == 0 && local->open_count == 0) {
595                         res = ieee80211_add_virtual_monitor(local);
596                         if (res)
597                                 goto err_stop;
598                 }
599
600                 /* must be before the call to ieee80211_configure_filter */
601                 local->monitors++;
602                 if (local->monitors == 1) {
603                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
604                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
605                 }
606
607                 ieee80211_adjust_monitor_flags(sdata, 1);
608                 ieee80211_configure_filter(local);
609
610                 netif_carrier_on(dev);
611                 break;
612         default:
613                 if (coming_up) {
614                         ieee80211_del_virtual_monitor(local);
615
616                         res = drv_add_interface(local, sdata);
617                         if (res)
618                                 goto err_stop;
619                         res = ieee80211_check_queues(sdata);
620                         if (res)
621                                 goto err_del_interface;
622                 }
623
624                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
625                         local->fif_pspoll++;
626                         local->fif_probe_req++;
627
628                         ieee80211_configure_filter(local);
629                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
630                         local->fif_probe_req++;
631                 }
632
633                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
634                         changed |= ieee80211_reset_erp_info(sdata);
635                 ieee80211_bss_info_change_notify(sdata, changed);
636
637                 switch (sdata->vif.type) {
638                 case NL80211_IFTYPE_STATION:
639                 case NL80211_IFTYPE_ADHOC:
640                 case NL80211_IFTYPE_AP:
641                 case NL80211_IFTYPE_MESH_POINT:
642                         netif_carrier_off(dev);
643                         break;
644                 case NL80211_IFTYPE_WDS:
645                 case NL80211_IFTYPE_P2P_DEVICE:
646                         break;
647                 default:
648                         netif_carrier_on(dev);
649                 }
650
651                 /*
652                  * set default queue parameters so drivers don't
653                  * need to initialise the hardware if the hardware
654                  * doesn't start up with sane defaults
655                  */
656                 ieee80211_set_wmm_default(sdata, true);
657         }
658
659         set_bit(SDATA_STATE_RUNNING, &sdata->state);
660
661         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
662                 /* Create STA entry for the WDS peer */
663                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
664                                      GFP_KERNEL);
665                 if (!sta) {
666                         res = -ENOMEM;
667                         goto err_del_interface;
668                 }
669
670                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
671                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
672                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
673
674                 res = sta_info_insert(sta);
675                 if (res) {
676                         /* STA has been freed */
677                         goto err_del_interface;
678                 }
679
680                 rate_control_rate_init(sta);
681                 netif_carrier_on(dev);
682         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
683                 rcu_assign_pointer(local->p2p_sdata, sdata);
684         }
685
686         /*
687          * set_multicast_list will be invoked by the networking core
688          * which will check whether any increments here were done in
689          * error and sync them down to the hardware as filter flags.
690          */
691         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
692                 atomic_inc(&local->iff_allmultis);
693
694         if (sdata->flags & IEEE80211_SDATA_PROMISC)
695                 atomic_inc(&local->iff_promiscs);
696
697         mutex_lock(&local->mtx);
698         hw_reconf_flags |= __ieee80211_recalc_idle(local);
699         mutex_unlock(&local->mtx);
700
701         if (coming_up)
702                 local->open_count++;
703
704         if (hw_reconf_flags)
705                 ieee80211_hw_config(local, hw_reconf_flags);
706
707         ieee80211_recalc_ps(local, -1);
708
709         if (dev)
710                 netif_tx_start_all_queues(dev);
711
712         return 0;
713  err_del_interface:
714         drv_remove_interface(local, sdata);
715  err_stop:
716         if (!local->open_count)
717                 drv_stop(local);
718  err_del_bss:
719         sdata->bss = NULL;
720         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
721                 list_del(&sdata->u.vlan.list);
722         /* might already be clear but that doesn't matter */
723         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
724         return res;
725 }
726
727 static int ieee80211_open(struct net_device *dev)
728 {
729         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
730         int err;
731
732         /* fail early if user set an invalid address */
733         if (!is_valid_ether_addr(dev->dev_addr))
734                 return -EADDRNOTAVAIL;
735
736         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
737         if (err)
738                 return err;
739
740         return ieee80211_do_open(&sdata->wdev, true);
741 }
742
743 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
744                               bool going_down)
745 {
746         struct ieee80211_local *local = sdata->local;
747         unsigned long flags;
748         struct sk_buff *skb, *tmp;
749         u32 hw_reconf_flags = 0;
750         int i, flushed;
751
752         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
753
754         if (rcu_access_pointer(local->scan_sdata) == sdata)
755                 ieee80211_scan_cancel(local);
756
757         /*
758          * Stop TX on this interface first.
759          */
760         if (sdata->dev)
761                 netif_tx_stop_all_queues(sdata->dev);
762
763         ieee80211_roc_purge(sdata);
764
765         /*
766          * Remove all stations associated with this interface.
767          *
768          * This must be done before calling ops->remove_interface()
769          * because otherwise we can later invoke ops->sta_notify()
770          * whenever the STAs are removed, and that invalidates driver
771          * assumptions about always getting a vif pointer that is valid
772          * (because if we remove a STA after ops->remove_interface()
773          * the driver will have removed the vif info already!)
774          *
775          * This is relevant only in WDS mode, in all other modes we've
776          * already removed all stations when disconnecting or similar,
777          * so warn otherwise.
778          *
779          * We call sta_info_flush_cleanup() later, to combine RCU waits.
780          */
781         flushed = sta_info_flush_defer(sdata);
782         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
783                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
784
785         /*
786          * Don't count this interface for promisc/allmulti while it
787          * is down. dev_mc_unsync() will invoke set_multicast_list
788          * on the master interface which will sync these down to the
789          * hardware as filter flags.
790          */
791         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
792                 atomic_dec(&local->iff_allmultis);
793
794         if (sdata->flags & IEEE80211_SDATA_PROMISC)
795                 atomic_dec(&local->iff_promiscs);
796
797         if (sdata->vif.type == NL80211_IFTYPE_AP) {
798                 local->fif_pspoll--;
799                 local->fif_probe_req--;
800         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
801                 local->fif_probe_req--;
802         }
803
804         if (sdata->dev) {
805                 netif_addr_lock_bh(sdata->dev);
806                 spin_lock_bh(&local->filter_lock);
807                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
808                                  sdata->dev->addr_len);
809                 spin_unlock_bh(&local->filter_lock);
810                 netif_addr_unlock_bh(sdata->dev);
811
812                 ieee80211_configure_filter(local);
813         }
814
815         del_timer_sync(&local->dynamic_ps_timer);
816         cancel_work_sync(&local->dynamic_ps_enable_work);
817
818         cancel_work_sync(&sdata->recalc_smps);
819
820         /* APs need special treatment */
821         if (sdata->vif.type == NL80211_IFTYPE_AP) {
822                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
823
824                 /* down all dependent devices, that is VLANs */
825                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
826                                          u.vlan.list)
827                         dev_close(vlan->dev);
828                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
829         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
830                 ieee80211_mgd_stop(sdata);
831         }
832
833         if (going_down)
834                 local->open_count--;
835
836         switch (sdata->vif.type) {
837         case NL80211_IFTYPE_AP_VLAN:
838                 list_del(&sdata->u.vlan.list);
839                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
840                 /* no need to tell driver */
841                 break;
842         case NL80211_IFTYPE_MONITOR:
843                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
844                         local->cooked_mntrs--;
845                         break;
846                 }
847
848                 local->monitors--;
849                 if (local->monitors == 0) {
850                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
851                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
852                         ieee80211_del_virtual_monitor(local);
853                 }
854
855                 ieee80211_adjust_monitor_flags(sdata, -1);
856                 ieee80211_configure_filter(local);
857                 break;
858         case NL80211_IFTYPE_P2P_DEVICE:
859                 /* relies on synchronize_rcu() below */
860                 rcu_assign_pointer(local->p2p_sdata, NULL);
861                 /* fall through */
862         default:
863                 cancel_work_sync(&sdata->work);
864                 /*
865                  * When we get here, the interface is marked down.
866                  *
867                  * sta_info_flush_cleanup() requires rcu_barrier()
868                  * first to wait for the station call_rcu() calls
869                  * to complete, here we need at least sychronize_rcu()
870                  * it to wait for the RX path in case it is using the
871                  * interface and enqueuing frames at this very time on
872                  * another CPU.
873                  */
874                 rcu_barrier();
875                 sta_info_flush_cleanup(sdata);
876
877                 skb_queue_purge(&sdata->skb_queue);
878
879                 /*
880                  * Free all remaining keys, there shouldn't be any,
881                  * except maybe group keys in AP more or WDS?
882                  */
883                 ieee80211_free_keys(sdata);
884
885                 if (going_down)
886                         drv_remove_interface(local, sdata);
887         }
888
889         sdata->bss = NULL;
890
891         mutex_lock(&local->mtx);
892         hw_reconf_flags |= __ieee80211_recalc_idle(local);
893         mutex_unlock(&local->mtx);
894
895         ieee80211_recalc_ps(local, -1);
896
897         if (local->open_count == 0) {
898                 if (local->ops->napi_poll)
899                         napi_disable(&local->napi);
900                 ieee80211_clear_tx_pending(local);
901                 ieee80211_stop_device(local);
902
903                 /* no reconfiguring after stop! */
904                 hw_reconf_flags = 0;
905         }
906
907         /* do after stop to avoid reconfiguring when we stop anyway */
908         if (hw_reconf_flags)
909                 ieee80211_hw_config(local, hw_reconf_flags);
910
911         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
912         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
913                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
914                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
915                         if (info->control.vif == &sdata->vif) {
916                                 __skb_unlink(skb, &local->pending[i]);
917                                 ieee80211_free_txskb(&local->hw, skb);
918                         }
919                 }
920         }
921         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
922
923         if (local->monitors == local->open_count && local->monitors > 0)
924                 ieee80211_add_virtual_monitor(local);
925 }
926
927 static int ieee80211_stop(struct net_device *dev)
928 {
929         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
930
931         ieee80211_do_stop(sdata, true);
932
933         return 0;
934 }
935
936 static void ieee80211_set_multicast_list(struct net_device *dev)
937 {
938         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
939         struct ieee80211_local *local = sdata->local;
940         int allmulti, promisc, sdata_allmulti, sdata_promisc;
941
942         allmulti = !!(dev->flags & IFF_ALLMULTI);
943         promisc = !!(dev->flags & IFF_PROMISC);
944         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
945         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
946
947         if (allmulti != sdata_allmulti) {
948                 if (dev->flags & IFF_ALLMULTI)
949                         atomic_inc(&local->iff_allmultis);
950                 else
951                         atomic_dec(&local->iff_allmultis);
952                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
953         }
954
955         if (promisc != sdata_promisc) {
956                 if (dev->flags & IFF_PROMISC)
957                         atomic_inc(&local->iff_promiscs);
958                 else
959                         atomic_dec(&local->iff_promiscs);
960                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
961         }
962         spin_lock_bh(&local->filter_lock);
963         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
964         spin_unlock_bh(&local->filter_lock);
965         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
966 }
967
968 /*
969  * Called when the netdev is removed or, by the code below, before
970  * the interface type changes.
971  */
972 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
973 {
974         int flushed;
975         int i;
976
977         /* free extra data */
978         ieee80211_free_keys(sdata);
979
980         ieee80211_debugfs_remove_netdev(sdata);
981
982         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
983                 __skb_queue_purge(&sdata->fragments[i].skb_list);
984         sdata->fragment_next = 0;
985
986         if (ieee80211_vif_is_mesh(&sdata->vif))
987                 mesh_rmc_free(sdata);
988
989         flushed = sta_info_flush(sdata);
990         WARN_ON(flushed);
991 }
992
993 static void ieee80211_uninit(struct net_device *dev)
994 {
995         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
996 }
997
998 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
999                                          struct sk_buff *skb)
1000 {
1001         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1002 }
1003
1004 static const struct net_device_ops ieee80211_dataif_ops = {
1005         .ndo_open               = ieee80211_open,
1006         .ndo_stop               = ieee80211_stop,
1007         .ndo_uninit             = ieee80211_uninit,
1008         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1009         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1010         .ndo_change_mtu         = ieee80211_change_mtu,
1011         .ndo_set_mac_address    = ieee80211_change_mac,
1012         .ndo_select_queue       = ieee80211_netdev_select_queue,
1013 };
1014
1015 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1016                                           struct sk_buff *skb)
1017 {
1018         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1019         struct ieee80211_local *local = sdata->local;
1020         struct ieee80211_hdr *hdr;
1021         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1022
1023         if (local->hw.queues < IEEE80211_NUM_ACS)
1024                 return 0;
1025
1026         if (skb->len < 4 ||
1027             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1028                 return 0; /* doesn't matter, frame will be dropped */
1029
1030         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1031
1032         return ieee80211_select_queue_80211(sdata, skb, hdr);
1033 }
1034
1035 static const struct net_device_ops ieee80211_monitorif_ops = {
1036         .ndo_open               = ieee80211_open,
1037         .ndo_stop               = ieee80211_stop,
1038         .ndo_uninit             = ieee80211_uninit,
1039         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1040         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1041         .ndo_change_mtu         = ieee80211_change_mtu,
1042         .ndo_set_mac_address    = eth_mac_addr,
1043         .ndo_select_queue       = ieee80211_monitor_select_queue,
1044 };
1045
1046 static void ieee80211_if_setup(struct net_device *dev)
1047 {
1048         ether_setup(dev);
1049         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1050         dev->netdev_ops = &ieee80211_dataif_ops;
1051         dev->destructor = free_netdev;
1052 }
1053
1054 static void ieee80211_iface_work(struct work_struct *work)
1055 {
1056         struct ieee80211_sub_if_data *sdata =
1057                 container_of(work, struct ieee80211_sub_if_data, work);
1058         struct ieee80211_local *local = sdata->local;
1059         struct sk_buff *skb;
1060         struct sta_info *sta;
1061         struct ieee80211_ra_tid *ra_tid;
1062
1063         if (!ieee80211_sdata_running(sdata))
1064                 return;
1065
1066         if (local->scanning)
1067                 return;
1068
1069         /*
1070          * ieee80211_queue_work() should have picked up most cases,
1071          * here we'll pick the rest.
1072          */
1073         if (WARN(local->suspended,
1074                  "interface work scheduled while going to suspend\n"))
1075                 return;
1076
1077         /* first process frames */
1078         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1079                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1080
1081                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1082                         ra_tid = (void *)&skb->cb;
1083                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1084                                                  ra_tid->tid);
1085                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1086                         ra_tid = (void *)&skb->cb;
1087                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1088                                                 ra_tid->tid);
1089                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1090                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1091                         int len = skb->len;
1092
1093                         mutex_lock(&local->sta_mtx);
1094                         sta = sta_info_get_bss(sdata, mgmt->sa);
1095                         if (sta) {
1096                                 switch (mgmt->u.action.u.addba_req.action_code) {
1097                                 case WLAN_ACTION_ADDBA_REQ:
1098                                         ieee80211_process_addba_request(
1099                                                         local, sta, mgmt, len);
1100                                         break;
1101                                 case WLAN_ACTION_ADDBA_RESP:
1102                                         ieee80211_process_addba_resp(local, sta,
1103                                                                      mgmt, len);
1104                                         break;
1105                                 case WLAN_ACTION_DELBA:
1106                                         ieee80211_process_delba(sdata, sta,
1107                                                                 mgmt, len);
1108                                         break;
1109                                 default:
1110                                         WARN_ON(1);
1111                                         break;
1112                                 }
1113                         }
1114                         mutex_unlock(&local->sta_mtx);
1115                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1116                         struct ieee80211_hdr *hdr = (void *)mgmt;
1117                         /*
1118                          * So the frame isn't mgmt, but frame_control
1119                          * is at the right place anyway, of course, so
1120                          * the if statement is correct.
1121                          *
1122                          * Warn if we have other data frame types here,
1123                          * they must not get here.
1124                          */
1125                         WARN_ON(hdr->frame_control &
1126                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1127                         WARN_ON(!(hdr->seq_ctrl &
1128                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1129                         /*
1130                          * This was a fragment of a frame, received while
1131                          * a block-ack session was active. That cannot be
1132                          * right, so terminate the session.
1133                          */
1134                         mutex_lock(&local->sta_mtx);
1135                         sta = sta_info_get_bss(sdata, mgmt->sa);
1136                         if (sta) {
1137                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1138                                                 IEEE80211_QOS_CTL_TID_MASK;
1139
1140                                 __ieee80211_stop_rx_ba_session(
1141                                         sta, tid, WLAN_BACK_RECIPIENT,
1142                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1143                                         true);
1144                         }
1145                         mutex_unlock(&local->sta_mtx);
1146                 } else switch (sdata->vif.type) {
1147                 case NL80211_IFTYPE_STATION:
1148                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1149                         break;
1150                 case NL80211_IFTYPE_ADHOC:
1151                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1152                         break;
1153                 case NL80211_IFTYPE_MESH_POINT:
1154                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1155                                 break;
1156                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1157                         break;
1158                 default:
1159                         WARN(1, "frame for unexpected interface type");
1160                         break;
1161                 }
1162
1163                 kfree_skb(skb);
1164         }
1165
1166         /* then other type-dependent work */
1167         switch (sdata->vif.type) {
1168         case NL80211_IFTYPE_STATION:
1169                 ieee80211_sta_work(sdata);
1170                 break;
1171         case NL80211_IFTYPE_ADHOC:
1172                 ieee80211_ibss_work(sdata);
1173                 break;
1174         case NL80211_IFTYPE_MESH_POINT:
1175                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1176                         break;
1177                 ieee80211_mesh_work(sdata);
1178                 break;
1179         default:
1180                 break;
1181         }
1182 }
1183
1184 static void ieee80211_recalc_smps_work(struct work_struct *work)
1185 {
1186         struct ieee80211_sub_if_data *sdata =
1187                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1188
1189         ieee80211_recalc_smps(sdata);
1190 }
1191
1192 /*
1193  * Helper function to initialise an interface to a specific type.
1194  */
1195 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1196                                   enum nl80211_iftype type)
1197 {
1198         /* clear type-dependent union */
1199         memset(&sdata->u, 0, sizeof(sdata->u));
1200
1201         /* and set some type-dependent values */
1202         sdata->vif.type = type;
1203         sdata->vif.p2p = false;
1204         sdata->wdev.iftype = type;
1205
1206         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1207         sdata->control_port_no_encrypt = false;
1208
1209         sdata->noack_map = 0;
1210
1211         /* only monitor/p2p-device differ */
1212         if (sdata->dev) {
1213                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1214                 sdata->dev->type = ARPHRD_ETHER;
1215         }
1216
1217         skb_queue_head_init(&sdata->skb_queue);
1218         INIT_WORK(&sdata->work, ieee80211_iface_work);
1219         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1220
1221         switch (type) {
1222         case NL80211_IFTYPE_P2P_GO:
1223                 type = NL80211_IFTYPE_AP;
1224                 sdata->vif.type = type;
1225                 sdata->vif.p2p = true;
1226                 /* fall through */
1227         case NL80211_IFTYPE_AP:
1228                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1229                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1230                 break;
1231         case NL80211_IFTYPE_P2P_CLIENT:
1232                 type = NL80211_IFTYPE_STATION;
1233                 sdata->vif.type = type;
1234                 sdata->vif.p2p = true;
1235                 /* fall through */
1236         case NL80211_IFTYPE_STATION:
1237                 ieee80211_sta_setup_sdata(sdata);
1238                 break;
1239         case NL80211_IFTYPE_ADHOC:
1240                 ieee80211_ibss_setup_sdata(sdata);
1241                 break;
1242         case NL80211_IFTYPE_MESH_POINT:
1243                 if (ieee80211_vif_is_mesh(&sdata->vif))
1244                         ieee80211_mesh_init_sdata(sdata);
1245                 break;
1246         case NL80211_IFTYPE_MONITOR:
1247                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1248                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1249                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1250                                       MONITOR_FLAG_OTHER_BSS;
1251                 break;
1252         case NL80211_IFTYPE_WDS:
1253         case NL80211_IFTYPE_AP_VLAN:
1254         case NL80211_IFTYPE_P2P_DEVICE:
1255                 break;
1256         case NL80211_IFTYPE_UNSPECIFIED:
1257         case NUM_NL80211_IFTYPES:
1258                 BUG();
1259                 break;
1260         }
1261
1262         ieee80211_debugfs_add_netdev(sdata);
1263 }
1264
1265 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1266                                            enum nl80211_iftype type)
1267 {
1268         struct ieee80211_local *local = sdata->local;
1269         int ret, err;
1270         enum nl80211_iftype internal_type = type;
1271         bool p2p = false;
1272
1273         ASSERT_RTNL();
1274
1275         if (!local->ops->change_interface)
1276                 return -EBUSY;
1277
1278         switch (sdata->vif.type) {
1279         case NL80211_IFTYPE_AP:
1280         case NL80211_IFTYPE_STATION:
1281         case NL80211_IFTYPE_ADHOC:
1282                 /*
1283                  * Could maybe also all others here?
1284                  * Just not sure how that interacts
1285                  * with the RX/config path e.g. for
1286                  * mesh.
1287                  */
1288                 break;
1289         default:
1290                 return -EBUSY;
1291         }
1292
1293         switch (type) {
1294         case NL80211_IFTYPE_AP:
1295         case NL80211_IFTYPE_STATION:
1296         case NL80211_IFTYPE_ADHOC:
1297                 /*
1298                  * Could probably support everything
1299                  * but WDS here (WDS do_open can fail
1300                  * under memory pressure, which this
1301                  * code isn't prepared to handle).
1302                  */
1303                 break;
1304         case NL80211_IFTYPE_P2P_CLIENT:
1305                 p2p = true;
1306                 internal_type = NL80211_IFTYPE_STATION;
1307                 break;
1308         case NL80211_IFTYPE_P2P_GO:
1309                 p2p = true;
1310                 internal_type = NL80211_IFTYPE_AP;
1311                 break;
1312         default:
1313                 return -EBUSY;
1314         }
1315
1316         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1317         if (ret)
1318                 return ret;
1319
1320         ieee80211_do_stop(sdata, false);
1321
1322         ieee80211_teardown_sdata(sdata);
1323
1324         ret = drv_change_interface(local, sdata, internal_type, p2p);
1325         if (ret)
1326                 type = sdata->vif.type;
1327
1328         /*
1329          * Ignore return value here, there's not much we can do since
1330          * the driver changed the interface type internally already.
1331          * The warnings will hopefully make driver authors fix it :-)
1332          */
1333         ieee80211_check_queues(sdata);
1334
1335         ieee80211_setup_sdata(sdata, type);
1336
1337         err = ieee80211_do_open(&sdata->wdev, false);
1338         WARN(err, "type change: do_open returned %d", err);
1339
1340         return ret;
1341 }
1342
1343 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1344                              enum nl80211_iftype type)
1345 {
1346         int ret;
1347
1348         ASSERT_RTNL();
1349
1350         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1351                 return 0;
1352
1353         if (ieee80211_sdata_running(sdata)) {
1354                 ret = ieee80211_runtime_change_iftype(sdata, type);
1355                 if (ret)
1356                         return ret;
1357         } else {
1358                 /* Purge and reset type-dependent state. */
1359                 ieee80211_teardown_sdata(sdata);
1360                 ieee80211_setup_sdata(sdata, type);
1361         }
1362
1363         /* reset some values that shouldn't be kept across type changes */
1364         sdata->drop_unencrypted = 0;
1365         if (type == NL80211_IFTYPE_STATION)
1366                 sdata->u.mgd.use_4addr = false;
1367
1368         return 0;
1369 }
1370
1371 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1372                                        u8 *perm_addr, enum nl80211_iftype type)
1373 {
1374         struct ieee80211_sub_if_data *sdata;
1375         u64 mask, start, addr, val, inc;
1376         u8 *m;
1377         u8 tmp_addr[ETH_ALEN];
1378         int i;
1379
1380         /* default ... something at least */
1381         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1382
1383         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1384             local->hw.wiphy->n_addresses <= 1)
1385                 return;
1386
1387         mutex_lock(&local->iflist_mtx);
1388
1389         switch (type) {
1390         case NL80211_IFTYPE_MONITOR:
1391                 /* doesn't matter */
1392                 break;
1393         case NL80211_IFTYPE_WDS:
1394         case NL80211_IFTYPE_AP_VLAN:
1395                 /* match up with an AP interface */
1396                 list_for_each_entry(sdata, &local->interfaces, list) {
1397                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1398                                 continue;
1399                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1400                         break;
1401                 }
1402                 /* keep default if no AP interface present */
1403                 break;
1404         case NL80211_IFTYPE_P2P_CLIENT:
1405         case NL80211_IFTYPE_P2P_GO:
1406                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1407                         list_for_each_entry(sdata, &local->interfaces, list) {
1408                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1409                                         continue;
1410                                 if (!ieee80211_sdata_running(sdata))
1411                                         continue;
1412                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1413                                 goto out_unlock;
1414                         }
1415                 }
1416                 /* otherwise fall through */
1417         default:
1418                 /* assign a new address if possible -- try n_addresses first */
1419                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1420                         bool used = false;
1421
1422                         list_for_each_entry(sdata, &local->interfaces, list) {
1423                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1424                                            sdata->vif.addr, ETH_ALEN) == 0) {
1425                                         used = true;
1426                                         break;
1427                                 }
1428                         }
1429
1430                         if (!used) {
1431                                 memcpy(perm_addr,
1432                                        local->hw.wiphy->addresses[i].addr,
1433                                        ETH_ALEN);
1434                                 break;
1435                         }
1436                 }
1437
1438                 /* try mask if available */
1439                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1440                         break;
1441
1442                 m = local->hw.wiphy->addr_mask;
1443                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1444                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1445                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1446
1447                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1448                         /* not a contiguous mask ... not handled now! */
1449                         pr_info("not contiguous\n");
1450                         break;
1451                 }
1452
1453                 m = local->hw.wiphy->perm_addr;
1454                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1455                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1456                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1457
1458                 inc = 1ULL<<__ffs64(mask);
1459                 val = (start & mask);
1460                 addr = (start & ~mask) | (val & mask);
1461                 do {
1462                         bool used = false;
1463
1464                         tmp_addr[5] = addr >> 0*8;
1465                         tmp_addr[4] = addr >> 1*8;
1466                         tmp_addr[3] = addr >> 2*8;
1467                         tmp_addr[2] = addr >> 3*8;
1468                         tmp_addr[1] = addr >> 4*8;
1469                         tmp_addr[0] = addr >> 5*8;
1470
1471                         val += inc;
1472
1473                         list_for_each_entry(sdata, &local->interfaces, list) {
1474                                 if (memcmp(tmp_addr, sdata->vif.addr,
1475                                                         ETH_ALEN) == 0) {
1476                                         used = true;
1477                                         break;
1478                                 }
1479                         }
1480
1481                         if (!used) {
1482                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1483                                 break;
1484                         }
1485                         addr = (start & ~mask) | (val & mask);
1486                 } while (addr != start);
1487
1488                 break;
1489         }
1490
1491  out_unlock:
1492         mutex_unlock(&local->iflist_mtx);
1493 }
1494
1495 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1496 {
1497         struct ieee80211_sub_if_data *sdata;
1498
1499         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1500
1501         ieee80211_cleanup_sdata_stas(sdata);
1502 }
1503
1504 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1505                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1506                      struct vif_params *params)
1507 {
1508         struct net_device *ndev = NULL;
1509         struct ieee80211_sub_if_data *sdata = NULL;
1510         int ret, i;
1511         int txqs = 1;
1512
1513         ASSERT_RTNL();
1514
1515         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1516                 struct wireless_dev *wdev;
1517
1518                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1519                                 GFP_KERNEL);
1520                 if (!sdata)
1521                         return -ENOMEM;
1522                 wdev = &sdata->wdev;
1523
1524                 sdata->dev = NULL;
1525                 strlcpy(sdata->name, name, IFNAMSIZ);
1526                 ieee80211_assign_perm_addr(local, wdev->address, type);
1527                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1528         } else {
1529                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1530                         txqs = IEEE80211_NUM_ACS;
1531
1532                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1533                                         local->hw.vif_data_size,
1534                                         name, ieee80211_if_setup, txqs, 1);
1535                 if (!ndev)
1536                         return -ENOMEM;
1537                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1538
1539                 ndev->needed_headroom = local->tx_headroom +
1540                                         4*6 /* four MAC addresses */
1541                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1542                                         + 6 /* mesh */
1543                                         + 8 /* rfc1042/bridge tunnel */
1544                                         - ETH_HLEN /* ethernet hard_header_len */
1545                                         + IEEE80211_ENCRYPT_HEADROOM;
1546                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1547
1548                 ret = dev_alloc_name(ndev, ndev->name);
1549                 if (ret < 0) {
1550                         free_netdev(ndev);
1551                         return ret;
1552                 }
1553
1554                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1555                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1556                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1557
1558                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1559                 sdata = netdev_priv(ndev);
1560                 ndev->ieee80211_ptr = &sdata->wdev;
1561                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1562                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1563
1564                 sdata->dev = ndev;
1565         }
1566
1567         /* initialise type-independent data */
1568         sdata->wdev.wiphy = local->hw.wiphy;
1569         sdata->local = local;
1570 #ifdef CONFIG_INET
1571         sdata->arp_filter_state = true;
1572 #endif
1573
1574         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1575                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1576
1577         INIT_LIST_HEAD(&sdata->key_list);
1578
1579         spin_lock_init(&sdata->cleanup_stations_lock);
1580         INIT_LIST_HEAD(&sdata->cleanup_stations);
1581         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1582
1583         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1584                 struct ieee80211_supported_band *sband;
1585                 sband = local->hw.wiphy->bands[i];
1586                 sdata->rc_rateidx_mask[i] =
1587                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1588                 if (sband)
1589                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1590                                sband->ht_cap.mcs.rx_mask,
1591                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1592                 else
1593                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1594                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1595         }
1596
1597         ieee80211_set_default_queues(sdata);
1598
1599         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1600         sdata->user_power_level = local->user_power_level;
1601
1602         /* setup type-dependent data */
1603         ieee80211_setup_sdata(sdata, type);
1604
1605         if (ndev) {
1606                 if (params) {
1607                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1608                         if (type == NL80211_IFTYPE_STATION)
1609                                 sdata->u.mgd.use_4addr = params->use_4addr;
1610                 }
1611
1612                 ndev->features |= local->hw.netdev_features;
1613
1614                 ret = register_netdevice(ndev);
1615                 if (ret) {
1616                         free_netdev(ndev);
1617                         return ret;
1618                 }
1619         }
1620
1621         mutex_lock(&local->iflist_mtx);
1622         list_add_tail_rcu(&sdata->list, &local->interfaces);
1623         mutex_unlock(&local->iflist_mtx);
1624
1625         if (new_wdev)
1626                 *new_wdev = &sdata->wdev;
1627
1628         return 0;
1629 }
1630
1631 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1632 {
1633         ASSERT_RTNL();
1634
1635         mutex_lock(&sdata->local->iflist_mtx);
1636         list_del_rcu(&sdata->list);
1637         mutex_unlock(&sdata->local->iflist_mtx);
1638
1639         synchronize_rcu();
1640
1641         if (sdata->dev) {
1642                 unregister_netdevice(sdata->dev);
1643         } else {
1644                 cfg80211_unregister_wdev(&sdata->wdev);
1645                 kfree(sdata);
1646         }
1647 }
1648
1649 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1650 {
1651         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1652                 return;
1653         ieee80211_do_stop(sdata, true);
1654         ieee80211_teardown_sdata(sdata);
1655 }
1656
1657 /*
1658  * Remove all interfaces, may only be called at hardware unregistration
1659  * time because it doesn't do RCU-safe list removals.
1660  */
1661 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1662 {
1663         struct ieee80211_sub_if_data *sdata, *tmp;
1664         LIST_HEAD(unreg_list);
1665         LIST_HEAD(wdev_list);
1666
1667         ASSERT_RTNL();
1668
1669         mutex_lock(&local->iflist_mtx);
1670         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1671                 list_del(&sdata->list);
1672
1673                 if (sdata->dev)
1674                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1675                 else
1676                         list_add(&sdata->list, &wdev_list);
1677         }
1678         mutex_unlock(&local->iflist_mtx);
1679         unregister_netdevice_many(&unreg_list);
1680         list_del(&unreg_list);
1681
1682         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1683                 list_del(&sdata->list);
1684                 cfg80211_unregister_wdev(&sdata->wdev);
1685                 kfree(sdata);
1686         }
1687 }
1688
1689 static int netdev_notify(struct notifier_block *nb,
1690                          unsigned long state,
1691                          void *ndev)
1692 {
1693         struct net_device *dev = ndev;
1694         struct ieee80211_sub_if_data *sdata;
1695
1696         if (state != NETDEV_CHANGENAME)
1697                 return 0;
1698
1699         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1700                 return 0;
1701
1702         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1703                 return 0;
1704
1705         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1706
1707         memcpy(sdata->name, dev->name, IFNAMSIZ);
1708
1709         ieee80211_debugfs_rename_netdev(sdata);
1710         return 0;
1711 }
1712
1713 static struct notifier_block mac80211_netdev_notifier = {
1714         .notifier_call = netdev_notify,
1715 };
1716
1717 int ieee80211_iface_init(void)
1718 {
1719         return register_netdevice_notifier(&mac80211_netdev_notifier);
1720 }
1721
1722 void ieee80211_iface_exit(void)
1723 {
1724         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1725 }