mac80211: warn if unexpectedly removing stations
[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         flushed = sta_info_flush(sdata);
780         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
781                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
782
783         /*
784          * Don't count this interface for promisc/allmulti while it
785          * is down. dev_mc_unsync() will invoke set_multicast_list
786          * on the master interface which will sync these down to the
787          * hardware as filter flags.
788          */
789         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
790                 atomic_dec(&local->iff_allmultis);
791
792         if (sdata->flags & IEEE80211_SDATA_PROMISC)
793                 atomic_dec(&local->iff_promiscs);
794
795         if (sdata->vif.type == NL80211_IFTYPE_AP) {
796                 local->fif_pspoll--;
797                 local->fif_probe_req--;
798         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
799                 local->fif_probe_req--;
800         }
801
802         if (sdata->dev) {
803                 netif_addr_lock_bh(sdata->dev);
804                 spin_lock_bh(&local->filter_lock);
805                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
806                                  sdata->dev->addr_len);
807                 spin_unlock_bh(&local->filter_lock);
808                 netif_addr_unlock_bh(sdata->dev);
809
810                 ieee80211_configure_filter(local);
811         }
812
813         del_timer_sync(&local->dynamic_ps_timer);
814         cancel_work_sync(&local->dynamic_ps_enable_work);
815
816         cancel_work_sync(&sdata->recalc_smps);
817
818         /* APs need special treatment */
819         if (sdata->vif.type == NL80211_IFTYPE_AP) {
820                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
821
822                 /* down all dependent devices, that is VLANs */
823                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
824                                          u.vlan.list)
825                         dev_close(vlan->dev);
826                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
827         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
828                 ieee80211_mgd_stop(sdata);
829         }
830
831         if (going_down)
832                 local->open_count--;
833
834         switch (sdata->vif.type) {
835         case NL80211_IFTYPE_AP_VLAN:
836                 list_del(&sdata->u.vlan.list);
837                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
838                 /* no need to tell driver */
839                 break;
840         case NL80211_IFTYPE_MONITOR:
841                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
842                         local->cooked_mntrs--;
843                         break;
844                 }
845
846                 local->monitors--;
847                 if (local->monitors == 0) {
848                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
849                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
850                         ieee80211_del_virtual_monitor(local);
851                 }
852
853                 ieee80211_adjust_monitor_flags(sdata, -1);
854                 ieee80211_configure_filter(local);
855                 break;
856         case NL80211_IFTYPE_P2P_DEVICE:
857                 /* relies on synchronize_rcu() below */
858                 rcu_assign_pointer(local->p2p_sdata, NULL);
859                 /* fall through */
860         default:
861                 cancel_work_sync(&sdata->work);
862                 /*
863                  * When we get here, the interface is marked down.
864                  * Call synchronize_rcu() to wait for the RX path
865                  * should it be using the interface and enqueuing
866                  * frames at this very time on another CPU.
867                  */
868                 synchronize_rcu();
869                 skb_queue_purge(&sdata->skb_queue);
870
871                 /*
872                  * Free all remaining keys, there shouldn't be any,
873                  * except maybe group keys in AP more or WDS?
874                  */
875                 ieee80211_free_keys(sdata);
876
877                 if (going_down)
878                         drv_remove_interface(local, sdata);
879         }
880
881         sdata->bss = NULL;
882
883         mutex_lock(&local->mtx);
884         hw_reconf_flags |= __ieee80211_recalc_idle(local);
885         mutex_unlock(&local->mtx);
886
887         ieee80211_recalc_ps(local, -1);
888
889         if (local->open_count == 0) {
890                 if (local->ops->napi_poll)
891                         napi_disable(&local->napi);
892                 ieee80211_clear_tx_pending(local);
893                 ieee80211_stop_device(local);
894
895                 /* no reconfiguring after stop! */
896                 hw_reconf_flags = 0;
897         }
898
899         /* do after stop to avoid reconfiguring when we stop anyway */
900         if (hw_reconf_flags)
901                 ieee80211_hw_config(local, hw_reconf_flags);
902
903         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
904         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
905                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
906                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
907                         if (info->control.vif == &sdata->vif) {
908                                 __skb_unlink(skb, &local->pending[i]);
909                                 ieee80211_free_txskb(&local->hw, skb);
910                         }
911                 }
912         }
913         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
914
915         if (local->monitors == local->open_count && local->monitors > 0)
916                 ieee80211_add_virtual_monitor(local);
917 }
918
919 static int ieee80211_stop(struct net_device *dev)
920 {
921         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
922
923         ieee80211_do_stop(sdata, true);
924
925         return 0;
926 }
927
928 static void ieee80211_set_multicast_list(struct net_device *dev)
929 {
930         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
931         struct ieee80211_local *local = sdata->local;
932         int allmulti, promisc, sdata_allmulti, sdata_promisc;
933
934         allmulti = !!(dev->flags & IFF_ALLMULTI);
935         promisc = !!(dev->flags & IFF_PROMISC);
936         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
937         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
938
939         if (allmulti != sdata_allmulti) {
940                 if (dev->flags & IFF_ALLMULTI)
941                         atomic_inc(&local->iff_allmultis);
942                 else
943                         atomic_dec(&local->iff_allmultis);
944                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
945         }
946
947         if (promisc != sdata_promisc) {
948                 if (dev->flags & IFF_PROMISC)
949                         atomic_inc(&local->iff_promiscs);
950                 else
951                         atomic_dec(&local->iff_promiscs);
952                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
953         }
954         spin_lock_bh(&local->filter_lock);
955         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
956         spin_unlock_bh(&local->filter_lock);
957         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
958 }
959
960 /*
961  * Called when the netdev is removed or, by the code below, before
962  * the interface type changes.
963  */
964 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
965 {
966         int flushed;
967         int i;
968
969         /* free extra data */
970         ieee80211_free_keys(sdata);
971
972         ieee80211_debugfs_remove_netdev(sdata);
973
974         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
975                 __skb_queue_purge(&sdata->fragments[i].skb_list);
976         sdata->fragment_next = 0;
977
978         if (ieee80211_vif_is_mesh(&sdata->vif))
979                 mesh_rmc_free(sdata);
980
981         flushed = sta_info_flush(sdata);
982         WARN_ON(flushed);
983 }
984
985 static void ieee80211_uninit(struct net_device *dev)
986 {
987         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
988 }
989
990 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
991                                          struct sk_buff *skb)
992 {
993         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
994 }
995
996 static const struct net_device_ops ieee80211_dataif_ops = {
997         .ndo_open               = ieee80211_open,
998         .ndo_stop               = ieee80211_stop,
999         .ndo_uninit             = ieee80211_uninit,
1000         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1001         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1002         .ndo_change_mtu         = ieee80211_change_mtu,
1003         .ndo_set_mac_address    = ieee80211_change_mac,
1004         .ndo_select_queue       = ieee80211_netdev_select_queue,
1005 };
1006
1007 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1008                                           struct sk_buff *skb)
1009 {
1010         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1011         struct ieee80211_local *local = sdata->local;
1012         struct ieee80211_hdr *hdr;
1013         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1014
1015         if (local->hw.queues < IEEE80211_NUM_ACS)
1016                 return 0;
1017
1018         if (skb->len < 4 ||
1019             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1020                 return 0; /* doesn't matter, frame will be dropped */
1021
1022         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1023
1024         return ieee80211_select_queue_80211(sdata, skb, hdr);
1025 }
1026
1027 static const struct net_device_ops ieee80211_monitorif_ops = {
1028         .ndo_open               = ieee80211_open,
1029         .ndo_stop               = ieee80211_stop,
1030         .ndo_uninit             = ieee80211_uninit,
1031         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1032         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1033         .ndo_change_mtu         = ieee80211_change_mtu,
1034         .ndo_set_mac_address    = eth_mac_addr,
1035         .ndo_select_queue       = ieee80211_monitor_select_queue,
1036 };
1037
1038 static void ieee80211_if_setup(struct net_device *dev)
1039 {
1040         ether_setup(dev);
1041         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1042         dev->netdev_ops = &ieee80211_dataif_ops;
1043         dev->destructor = free_netdev;
1044 }
1045
1046 static void ieee80211_iface_work(struct work_struct *work)
1047 {
1048         struct ieee80211_sub_if_data *sdata =
1049                 container_of(work, struct ieee80211_sub_if_data, work);
1050         struct ieee80211_local *local = sdata->local;
1051         struct sk_buff *skb;
1052         struct sta_info *sta;
1053         struct ieee80211_ra_tid *ra_tid;
1054
1055         if (!ieee80211_sdata_running(sdata))
1056                 return;
1057
1058         if (local->scanning)
1059                 return;
1060
1061         /*
1062          * ieee80211_queue_work() should have picked up most cases,
1063          * here we'll pick the rest.
1064          */
1065         if (WARN(local->suspended,
1066                  "interface work scheduled while going to suspend\n"))
1067                 return;
1068
1069         /* first process frames */
1070         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1071                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1072
1073                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1074                         ra_tid = (void *)&skb->cb;
1075                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1076                                                  ra_tid->tid);
1077                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1078                         ra_tid = (void *)&skb->cb;
1079                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1080                                                 ra_tid->tid);
1081                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1082                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1083                         int len = skb->len;
1084
1085                         mutex_lock(&local->sta_mtx);
1086                         sta = sta_info_get_bss(sdata, mgmt->sa);
1087                         if (sta) {
1088                                 switch (mgmt->u.action.u.addba_req.action_code) {
1089                                 case WLAN_ACTION_ADDBA_REQ:
1090                                         ieee80211_process_addba_request(
1091                                                         local, sta, mgmt, len);
1092                                         break;
1093                                 case WLAN_ACTION_ADDBA_RESP:
1094                                         ieee80211_process_addba_resp(local, sta,
1095                                                                      mgmt, len);
1096                                         break;
1097                                 case WLAN_ACTION_DELBA:
1098                                         ieee80211_process_delba(sdata, sta,
1099                                                                 mgmt, len);
1100                                         break;
1101                                 default:
1102                                         WARN_ON(1);
1103                                         break;
1104                                 }
1105                         }
1106                         mutex_unlock(&local->sta_mtx);
1107                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1108                         struct ieee80211_hdr *hdr = (void *)mgmt;
1109                         /*
1110                          * So the frame isn't mgmt, but frame_control
1111                          * is at the right place anyway, of course, so
1112                          * the if statement is correct.
1113                          *
1114                          * Warn if we have other data frame types here,
1115                          * they must not get here.
1116                          */
1117                         WARN_ON(hdr->frame_control &
1118                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1119                         WARN_ON(!(hdr->seq_ctrl &
1120                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1121                         /*
1122                          * This was a fragment of a frame, received while
1123                          * a block-ack session was active. That cannot be
1124                          * right, so terminate the session.
1125                          */
1126                         mutex_lock(&local->sta_mtx);
1127                         sta = sta_info_get_bss(sdata, mgmt->sa);
1128                         if (sta) {
1129                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1130                                                 IEEE80211_QOS_CTL_TID_MASK;
1131
1132                                 __ieee80211_stop_rx_ba_session(
1133                                         sta, tid, WLAN_BACK_RECIPIENT,
1134                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1135                                         true);
1136                         }
1137                         mutex_unlock(&local->sta_mtx);
1138                 } else switch (sdata->vif.type) {
1139                 case NL80211_IFTYPE_STATION:
1140                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1141                         break;
1142                 case NL80211_IFTYPE_ADHOC:
1143                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1144                         break;
1145                 case NL80211_IFTYPE_MESH_POINT:
1146                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1147                                 break;
1148                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1149                         break;
1150                 default:
1151                         WARN(1, "frame for unexpected interface type");
1152                         break;
1153                 }
1154
1155                 kfree_skb(skb);
1156         }
1157
1158         /* then other type-dependent work */
1159         switch (sdata->vif.type) {
1160         case NL80211_IFTYPE_STATION:
1161                 ieee80211_sta_work(sdata);
1162                 break;
1163         case NL80211_IFTYPE_ADHOC:
1164                 ieee80211_ibss_work(sdata);
1165                 break;
1166         case NL80211_IFTYPE_MESH_POINT:
1167                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1168                         break;
1169                 ieee80211_mesh_work(sdata);
1170                 break;
1171         default:
1172                 break;
1173         }
1174 }
1175
1176 static void ieee80211_recalc_smps_work(struct work_struct *work)
1177 {
1178         struct ieee80211_sub_if_data *sdata =
1179                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1180
1181         ieee80211_recalc_smps(sdata);
1182 }
1183
1184 /*
1185  * Helper function to initialise an interface to a specific type.
1186  */
1187 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1188                                   enum nl80211_iftype type)
1189 {
1190         /* clear type-dependent union */
1191         memset(&sdata->u, 0, sizeof(sdata->u));
1192
1193         /* and set some type-dependent values */
1194         sdata->vif.type = type;
1195         sdata->vif.p2p = false;
1196         sdata->wdev.iftype = type;
1197
1198         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1199         sdata->control_port_no_encrypt = false;
1200
1201         sdata->noack_map = 0;
1202
1203         /* only monitor/p2p-device differ */
1204         if (sdata->dev) {
1205                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1206                 sdata->dev->type = ARPHRD_ETHER;
1207         }
1208
1209         skb_queue_head_init(&sdata->skb_queue);
1210         INIT_WORK(&sdata->work, ieee80211_iface_work);
1211         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1212
1213         switch (type) {
1214         case NL80211_IFTYPE_P2P_GO:
1215                 type = NL80211_IFTYPE_AP;
1216                 sdata->vif.type = type;
1217                 sdata->vif.p2p = true;
1218                 /* fall through */
1219         case NL80211_IFTYPE_AP:
1220                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1221                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1222                 break;
1223         case NL80211_IFTYPE_P2P_CLIENT:
1224                 type = NL80211_IFTYPE_STATION;
1225                 sdata->vif.type = type;
1226                 sdata->vif.p2p = true;
1227                 /* fall through */
1228         case NL80211_IFTYPE_STATION:
1229                 ieee80211_sta_setup_sdata(sdata);
1230                 break;
1231         case NL80211_IFTYPE_ADHOC:
1232                 ieee80211_ibss_setup_sdata(sdata);
1233                 break;
1234         case NL80211_IFTYPE_MESH_POINT:
1235                 if (ieee80211_vif_is_mesh(&sdata->vif))
1236                         ieee80211_mesh_init_sdata(sdata);
1237                 break;
1238         case NL80211_IFTYPE_MONITOR:
1239                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1240                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1241                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1242                                       MONITOR_FLAG_OTHER_BSS;
1243                 break;
1244         case NL80211_IFTYPE_WDS:
1245         case NL80211_IFTYPE_AP_VLAN:
1246         case NL80211_IFTYPE_P2P_DEVICE:
1247                 break;
1248         case NL80211_IFTYPE_UNSPECIFIED:
1249         case NUM_NL80211_IFTYPES:
1250                 BUG();
1251                 break;
1252         }
1253
1254         ieee80211_debugfs_add_netdev(sdata);
1255 }
1256
1257 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1258                                            enum nl80211_iftype type)
1259 {
1260         struct ieee80211_local *local = sdata->local;
1261         int ret, err;
1262         enum nl80211_iftype internal_type = type;
1263         bool p2p = false;
1264
1265         ASSERT_RTNL();
1266
1267         if (!local->ops->change_interface)
1268                 return -EBUSY;
1269
1270         switch (sdata->vif.type) {
1271         case NL80211_IFTYPE_AP:
1272         case NL80211_IFTYPE_STATION:
1273         case NL80211_IFTYPE_ADHOC:
1274                 /*
1275                  * Could maybe also all others here?
1276                  * Just not sure how that interacts
1277                  * with the RX/config path e.g. for
1278                  * mesh.
1279                  */
1280                 break;
1281         default:
1282                 return -EBUSY;
1283         }
1284
1285         switch (type) {
1286         case NL80211_IFTYPE_AP:
1287         case NL80211_IFTYPE_STATION:
1288         case NL80211_IFTYPE_ADHOC:
1289                 /*
1290                  * Could probably support everything
1291                  * but WDS here (WDS do_open can fail
1292                  * under memory pressure, which this
1293                  * code isn't prepared to handle).
1294                  */
1295                 break;
1296         case NL80211_IFTYPE_P2P_CLIENT:
1297                 p2p = true;
1298                 internal_type = NL80211_IFTYPE_STATION;
1299                 break;
1300         case NL80211_IFTYPE_P2P_GO:
1301                 p2p = true;
1302                 internal_type = NL80211_IFTYPE_AP;
1303                 break;
1304         default:
1305                 return -EBUSY;
1306         }
1307
1308         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1309         if (ret)
1310                 return ret;
1311
1312         ieee80211_do_stop(sdata, false);
1313
1314         ieee80211_teardown_sdata(sdata);
1315
1316         ret = drv_change_interface(local, sdata, internal_type, p2p);
1317         if (ret)
1318                 type = sdata->vif.type;
1319
1320         /*
1321          * Ignore return value here, there's not much we can do since
1322          * the driver changed the interface type internally already.
1323          * The warnings will hopefully make driver authors fix it :-)
1324          */
1325         ieee80211_check_queues(sdata);
1326
1327         ieee80211_setup_sdata(sdata, type);
1328
1329         err = ieee80211_do_open(&sdata->wdev, false);
1330         WARN(err, "type change: do_open returned %d", err);
1331
1332         return ret;
1333 }
1334
1335 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1336                              enum nl80211_iftype type)
1337 {
1338         int ret;
1339
1340         ASSERT_RTNL();
1341
1342         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1343                 return 0;
1344
1345         if (ieee80211_sdata_running(sdata)) {
1346                 ret = ieee80211_runtime_change_iftype(sdata, type);
1347                 if (ret)
1348                         return ret;
1349         } else {
1350                 /* Purge and reset type-dependent state. */
1351                 ieee80211_teardown_sdata(sdata);
1352                 ieee80211_setup_sdata(sdata, type);
1353         }
1354
1355         /* reset some values that shouldn't be kept across type changes */
1356         sdata->drop_unencrypted = 0;
1357         if (type == NL80211_IFTYPE_STATION)
1358                 sdata->u.mgd.use_4addr = false;
1359
1360         return 0;
1361 }
1362
1363 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1364                                        u8 *perm_addr, enum nl80211_iftype type)
1365 {
1366         struct ieee80211_sub_if_data *sdata;
1367         u64 mask, start, addr, val, inc;
1368         u8 *m;
1369         u8 tmp_addr[ETH_ALEN];
1370         int i;
1371
1372         /* default ... something at least */
1373         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1374
1375         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1376             local->hw.wiphy->n_addresses <= 1)
1377                 return;
1378
1379         mutex_lock(&local->iflist_mtx);
1380
1381         switch (type) {
1382         case NL80211_IFTYPE_MONITOR:
1383                 /* doesn't matter */
1384                 break;
1385         case NL80211_IFTYPE_WDS:
1386         case NL80211_IFTYPE_AP_VLAN:
1387                 /* match up with an AP interface */
1388                 list_for_each_entry(sdata, &local->interfaces, list) {
1389                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1390                                 continue;
1391                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1392                         break;
1393                 }
1394                 /* keep default if no AP interface present */
1395                 break;
1396         case NL80211_IFTYPE_P2P_CLIENT:
1397         case NL80211_IFTYPE_P2P_GO:
1398                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1399                         list_for_each_entry(sdata, &local->interfaces, list) {
1400                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1401                                         continue;
1402                                 if (!ieee80211_sdata_running(sdata))
1403                                         continue;
1404                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1405                                 goto out_unlock;
1406                         }
1407                 }
1408                 /* otherwise fall through */
1409         default:
1410                 /* assign a new address if possible -- try n_addresses first */
1411                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1412                         bool used = false;
1413
1414                         list_for_each_entry(sdata, &local->interfaces, list) {
1415                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1416                                            sdata->vif.addr, ETH_ALEN) == 0) {
1417                                         used = true;
1418                                         break;
1419                                 }
1420                         }
1421
1422                         if (!used) {
1423                                 memcpy(perm_addr,
1424                                        local->hw.wiphy->addresses[i].addr,
1425                                        ETH_ALEN);
1426                                 break;
1427                         }
1428                 }
1429
1430                 /* try mask if available */
1431                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1432                         break;
1433
1434                 m = local->hw.wiphy->addr_mask;
1435                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1436                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1437                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1438
1439                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1440                         /* not a contiguous mask ... not handled now! */
1441                         pr_info("not contiguous\n");
1442                         break;
1443                 }
1444
1445                 m = local->hw.wiphy->perm_addr;
1446                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1447                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1448                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1449
1450                 inc = 1ULL<<__ffs64(mask);
1451                 val = (start & mask);
1452                 addr = (start & ~mask) | (val & mask);
1453                 do {
1454                         bool used = false;
1455
1456                         tmp_addr[5] = addr >> 0*8;
1457                         tmp_addr[4] = addr >> 1*8;
1458                         tmp_addr[3] = addr >> 2*8;
1459                         tmp_addr[2] = addr >> 3*8;
1460                         tmp_addr[1] = addr >> 4*8;
1461                         tmp_addr[0] = addr >> 5*8;
1462
1463                         val += inc;
1464
1465                         list_for_each_entry(sdata, &local->interfaces, list) {
1466                                 if (memcmp(tmp_addr, sdata->vif.addr,
1467                                                         ETH_ALEN) == 0) {
1468                                         used = true;
1469                                         break;
1470                                 }
1471                         }
1472
1473                         if (!used) {
1474                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1475                                 break;
1476                         }
1477                         addr = (start & ~mask) | (val & mask);
1478                 } while (addr != start);
1479
1480                 break;
1481         }
1482
1483  out_unlock:
1484         mutex_unlock(&local->iflist_mtx);
1485 }
1486
1487 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1488 {
1489         struct ieee80211_sub_if_data *sdata;
1490
1491         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1492
1493         ieee80211_cleanup_sdata_stas(sdata);
1494 }
1495
1496 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1497                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1498                      struct vif_params *params)
1499 {
1500         struct net_device *ndev = NULL;
1501         struct ieee80211_sub_if_data *sdata = NULL;
1502         int ret, i;
1503         int txqs = 1;
1504
1505         ASSERT_RTNL();
1506
1507         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1508                 struct wireless_dev *wdev;
1509
1510                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1511                                 GFP_KERNEL);
1512                 if (!sdata)
1513                         return -ENOMEM;
1514                 wdev = &sdata->wdev;
1515
1516                 sdata->dev = NULL;
1517                 strlcpy(sdata->name, name, IFNAMSIZ);
1518                 ieee80211_assign_perm_addr(local, wdev->address, type);
1519                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1520         } else {
1521                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1522                         txqs = IEEE80211_NUM_ACS;
1523
1524                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1525                                         local->hw.vif_data_size,
1526                                         name, ieee80211_if_setup, txqs, 1);
1527                 if (!ndev)
1528                         return -ENOMEM;
1529                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1530
1531                 ndev->needed_headroom = local->tx_headroom +
1532                                         4*6 /* four MAC addresses */
1533                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1534                                         + 6 /* mesh */
1535                                         + 8 /* rfc1042/bridge tunnel */
1536                                         - ETH_HLEN /* ethernet hard_header_len */
1537                                         + IEEE80211_ENCRYPT_HEADROOM;
1538                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1539
1540                 ret = dev_alloc_name(ndev, ndev->name);
1541                 if (ret < 0) {
1542                         free_netdev(ndev);
1543                         return ret;
1544                 }
1545
1546                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1547                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1548                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1549
1550                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1551                 sdata = netdev_priv(ndev);
1552                 ndev->ieee80211_ptr = &sdata->wdev;
1553                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1554                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1555
1556                 sdata->dev = ndev;
1557         }
1558
1559         /* initialise type-independent data */
1560         sdata->wdev.wiphy = local->hw.wiphy;
1561         sdata->local = local;
1562 #ifdef CONFIG_INET
1563         sdata->arp_filter_state = true;
1564 #endif
1565
1566         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1567                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1568
1569         INIT_LIST_HEAD(&sdata->key_list);
1570
1571         spin_lock_init(&sdata->cleanup_stations_lock);
1572         INIT_LIST_HEAD(&sdata->cleanup_stations);
1573         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1574
1575         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1576                 struct ieee80211_supported_band *sband;
1577                 sband = local->hw.wiphy->bands[i];
1578                 sdata->rc_rateidx_mask[i] =
1579                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1580                 if (sband)
1581                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1582                                sband->ht_cap.mcs.rx_mask,
1583                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1584                 else
1585                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1586                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1587         }
1588
1589         ieee80211_set_default_queues(sdata);
1590
1591         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1592         sdata->user_power_level = local->user_power_level;
1593
1594         /* setup type-dependent data */
1595         ieee80211_setup_sdata(sdata, type);
1596
1597         if (ndev) {
1598                 if (params) {
1599                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1600                         if (type == NL80211_IFTYPE_STATION)
1601                                 sdata->u.mgd.use_4addr = params->use_4addr;
1602                 }
1603
1604                 ndev->features |= local->hw.netdev_features;
1605
1606                 ret = register_netdevice(ndev);
1607                 if (ret) {
1608                         free_netdev(ndev);
1609                         return ret;
1610                 }
1611         }
1612
1613         mutex_lock(&local->iflist_mtx);
1614         list_add_tail_rcu(&sdata->list, &local->interfaces);
1615         mutex_unlock(&local->iflist_mtx);
1616
1617         if (new_wdev)
1618                 *new_wdev = &sdata->wdev;
1619
1620         return 0;
1621 }
1622
1623 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1624 {
1625         ASSERT_RTNL();
1626
1627         mutex_lock(&sdata->local->iflist_mtx);
1628         list_del_rcu(&sdata->list);
1629         mutex_unlock(&sdata->local->iflist_mtx);
1630
1631         synchronize_rcu();
1632
1633         if (sdata->dev) {
1634                 unregister_netdevice(sdata->dev);
1635         } else {
1636                 cfg80211_unregister_wdev(&sdata->wdev);
1637                 kfree(sdata);
1638         }
1639 }
1640
1641 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1642 {
1643         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1644                 return;
1645         ieee80211_do_stop(sdata, true);
1646         ieee80211_teardown_sdata(sdata);
1647 }
1648
1649 /*
1650  * Remove all interfaces, may only be called at hardware unregistration
1651  * time because it doesn't do RCU-safe list removals.
1652  */
1653 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1654 {
1655         struct ieee80211_sub_if_data *sdata, *tmp;
1656         LIST_HEAD(unreg_list);
1657         LIST_HEAD(wdev_list);
1658
1659         ASSERT_RTNL();
1660
1661         mutex_lock(&local->iflist_mtx);
1662         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1663                 list_del(&sdata->list);
1664
1665                 if (sdata->dev)
1666                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1667                 else
1668                         list_add(&sdata->list, &wdev_list);
1669         }
1670         mutex_unlock(&local->iflist_mtx);
1671         unregister_netdevice_many(&unreg_list);
1672         list_del(&unreg_list);
1673
1674         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1675                 list_del(&sdata->list);
1676                 cfg80211_unregister_wdev(&sdata->wdev);
1677                 kfree(sdata);
1678         }
1679 }
1680
1681 static int netdev_notify(struct notifier_block *nb,
1682                          unsigned long state,
1683                          void *ndev)
1684 {
1685         struct net_device *dev = ndev;
1686         struct ieee80211_sub_if_data *sdata;
1687
1688         if (state != NETDEV_CHANGENAME)
1689                 return 0;
1690
1691         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1692                 return 0;
1693
1694         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1695                 return 0;
1696
1697         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1698
1699         memcpy(sdata->name, dev->name, IFNAMSIZ);
1700
1701         ieee80211_debugfs_rename_netdev(sdata);
1702         return 0;
1703 }
1704
1705 static struct notifier_block mac80211_netdev_notifier = {
1706         .notifier_call = netdev_notify,
1707 };
1708
1709 int ieee80211_iface_init(void)
1710 {
1711         return register_netdevice_notifier(&mac80211_netdev_notifier);
1712 }
1713
1714 void ieee80211_iface_exit(void)
1715 {
1716         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1717 }