mac80211: cancel work instead of waiting for it to do nothing
[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         int meshhdrlen;
211         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
212
213         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
214
215         /* FIX: what would be proper limits for MTU?
216          * This interface uses 802.3 frames. */
217         if (new_mtu < 256 ||
218             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
219                 return -EINVAL;
220         }
221
222         dev->mtu = new_mtu;
223         return 0;
224 }
225
226 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
227 {
228         struct ieee80211_sub_if_data *sdata;
229         u64 new, mask, tmp;
230         u8 *m;
231         int ret = 0;
232
233         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
234                 return 0;
235
236         m = addr;
237         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
238                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
239                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
240
241         m = local->hw.wiphy->addr_mask;
242         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
243                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
244                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
245
246
247         mutex_lock(&local->iflist_mtx);
248         list_for_each_entry(sdata, &local->interfaces, list) {
249                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
250                         continue;
251
252                 m = sdata->vif.addr;
253                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
254                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
255                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
256
257                 if ((new & ~mask) != (tmp & ~mask)) {
258                         ret = -EINVAL;
259                         break;
260                 }
261         }
262         mutex_unlock(&local->iflist_mtx);
263
264         return ret;
265 }
266
267 static int ieee80211_change_mac(struct net_device *dev, void *addr)
268 {
269         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
270         struct sockaddr *sa = addr;
271         int ret;
272
273         if (ieee80211_sdata_running(sdata))
274                 return -EBUSY;
275
276         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
277         if (ret)
278                 return ret;
279
280         ret = eth_mac_addr(dev, sa);
281
282         if (ret == 0)
283                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
284
285         return ret;
286 }
287
288 static inline int identical_mac_addr_allowed(int type1, int type2)
289 {
290         return type1 == NL80211_IFTYPE_MONITOR ||
291                 type2 == NL80211_IFTYPE_MONITOR ||
292                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
293                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
294                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
295                 (type1 == NL80211_IFTYPE_WDS &&
296                         (type2 == NL80211_IFTYPE_WDS ||
297                          type2 == NL80211_IFTYPE_AP)) ||
298                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
299                 (type1 == NL80211_IFTYPE_AP_VLAN &&
300                         (type2 == NL80211_IFTYPE_AP ||
301                          type2 == NL80211_IFTYPE_AP_VLAN));
302 }
303
304 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
305                                             enum nl80211_iftype iftype)
306 {
307         struct ieee80211_local *local = sdata->local;
308         struct ieee80211_sub_if_data *nsdata;
309
310         ASSERT_RTNL();
311
312         /* we hold the RTNL here so can safely walk the list */
313         list_for_each_entry(nsdata, &local->interfaces, list) {
314                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
315                         /*
316                          * Allow only a single IBSS interface to be up at any
317                          * time. This is restricted because beacon distribution
318                          * cannot work properly if both are in the same IBSS.
319                          *
320                          * To remove this restriction we'd have to disallow them
321                          * from setting the same SSID on different IBSS interfaces
322                          * belonging to the same hardware. Then, however, we're
323                          * faced with having to adopt two different TSF timers...
324                          */
325                         if (iftype == NL80211_IFTYPE_ADHOC &&
326                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
327                                 return -EBUSY;
328
329                         /*
330                          * The remaining checks are only performed for interfaces
331                          * with the same MAC address.
332                          */
333                         if (!ether_addr_equal(sdata->vif.addr,
334                                               nsdata->vif.addr))
335                                 continue;
336
337                         /*
338                          * check whether it may have the same address
339                          */
340                         if (!identical_mac_addr_allowed(iftype,
341                                                         nsdata->vif.type))
342                                 return -ENOTUNIQ;
343
344                         /*
345                          * can only add VLANs to enabled APs
346                          */
347                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
348                             nsdata->vif.type == NL80211_IFTYPE_AP)
349                                 sdata->bss = &nsdata->u.ap;
350                 }
351         }
352
353         return 0;
354 }
355
356 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
357 {
358         int n_queues = sdata->local->hw.queues;
359         int i;
360
361         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
362                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
363                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
364                                          IEEE80211_INVAL_HW_QUEUE))
365                                 return -EINVAL;
366                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
367                                          n_queues))
368                                 return -EINVAL;
369                 }
370         }
371
372         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
373             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
374                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
375                 return 0;
376         }
377
378         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
379                 return -EINVAL;
380
381         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
382                 return -EINVAL;
383
384         return 0;
385 }
386
387 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
388                                     const int offset)
389 {
390         struct ieee80211_local *local = sdata->local;
391         u32 flags = sdata->u.mntr_flags;
392
393 #define ADJUST(_f, _s)  do {                                    \
394         if (flags & MONITOR_FLAG_##_f)                          \
395                 local->fif_##_s += offset;                      \
396         } while (0)
397
398         ADJUST(FCSFAIL, fcsfail);
399         ADJUST(PLCPFAIL, plcpfail);
400         ADJUST(CONTROL, control);
401         ADJUST(CONTROL, pspoll);
402         ADJUST(OTHER_BSS, other_bss);
403
404 #undef ADJUST
405 }
406
407 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
408 {
409         struct ieee80211_local *local = sdata->local;
410         int i;
411
412         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
413                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
414                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
415                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
416                         sdata->vif.hw_queue[i] = i;
417                 else
418                         sdata->vif.hw_queue[i] = 0;
419         }
420         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
421 }
422
423 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
424 {
425         struct ieee80211_sub_if_data *sdata;
426         int ret = 0;
427
428         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
429                 return 0;
430
431         mutex_lock(&local->iflist_mtx);
432
433         if (local->monitor_sdata)
434                 goto out_unlock;
435
436         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
437         if (!sdata) {
438                 ret = -ENOMEM;
439                 goto out_unlock;
440         }
441
442         /* set up data */
443         sdata->local = local;
444         sdata->vif.type = NL80211_IFTYPE_MONITOR;
445         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
446                  wiphy_name(local->hw.wiphy));
447
448         ieee80211_set_default_queues(sdata);
449
450         ret = drv_add_interface(local, sdata);
451         if (WARN_ON(ret)) {
452                 /* ok .. stupid driver, it asked for this! */
453                 kfree(sdata);
454                 goto out_unlock;
455         }
456
457         ret = ieee80211_check_queues(sdata);
458         if (ret) {
459                 kfree(sdata);
460                 goto out_unlock;
461         }
462
463         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
464                                         IEEE80211_CHANCTX_EXCLUSIVE);
465         if (ret) {
466                 drv_remove_interface(local, sdata);
467                 kfree(sdata);
468                 goto out_unlock;
469         }
470
471         rcu_assign_pointer(local->monitor_sdata, sdata);
472  out_unlock:
473         mutex_unlock(&local->iflist_mtx);
474         return ret;
475 }
476
477 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
478 {
479         struct ieee80211_sub_if_data *sdata;
480
481         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
482                 return;
483
484         mutex_lock(&local->iflist_mtx);
485
486         sdata = rcu_dereference_protected(local->monitor_sdata,
487                                           lockdep_is_held(&local->iflist_mtx));
488         if (!sdata)
489                 goto out_unlock;
490
491         rcu_assign_pointer(local->monitor_sdata, NULL);
492         synchronize_net();
493
494         ieee80211_vif_release_channel(sdata);
495
496         drv_remove_interface(local, sdata);
497
498         kfree(sdata);
499  out_unlock:
500         mutex_unlock(&local->iflist_mtx);
501 }
502
503 /*
504  * NOTE: Be very careful when changing this function, it must NOT return
505  * an error on interface type changes that have been pre-checked, so most
506  * checks should be in ieee80211_check_concurrent_iface.
507  */
508 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
509 {
510         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
511         struct net_device *dev = wdev->netdev;
512         struct ieee80211_local *local = sdata->local;
513         struct sta_info *sta;
514         u32 changed = 0;
515         int res;
516         u32 hw_reconf_flags = 0;
517
518         switch (sdata->vif.type) {
519         case NL80211_IFTYPE_WDS:
520                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
521                         return -ENOLINK;
522                 break;
523         case NL80211_IFTYPE_AP_VLAN: {
524                 struct ieee80211_sub_if_data *master;
525
526                 if (!sdata->bss)
527                         return -ENOLINK;
528
529                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
530
531                 master = container_of(sdata->bss,
532                                       struct ieee80211_sub_if_data, u.ap);
533                 sdata->control_port_protocol =
534                         master->control_port_protocol;
535                 sdata->control_port_no_encrypt =
536                         master->control_port_no_encrypt;
537                 break;
538                 }
539         case NL80211_IFTYPE_AP:
540                 sdata->bss = &sdata->u.ap;
541                 break;
542         case NL80211_IFTYPE_MESH_POINT:
543         case NL80211_IFTYPE_STATION:
544         case NL80211_IFTYPE_MONITOR:
545         case NL80211_IFTYPE_ADHOC:
546         case NL80211_IFTYPE_P2P_DEVICE:
547                 /* no special treatment */
548                 break;
549         case NL80211_IFTYPE_UNSPECIFIED:
550         case NUM_NL80211_IFTYPES:
551         case NL80211_IFTYPE_P2P_CLIENT:
552         case NL80211_IFTYPE_P2P_GO:
553                 /* cannot happen */
554                 WARN_ON(1);
555                 break;
556         }
557
558         if (local->open_count == 0) {
559                 res = drv_start(local);
560                 if (res)
561                         goto err_del_bss;
562                 if (local->ops->napi_poll)
563                         napi_enable(&local->napi);
564                 /* we're brought up, everything changes */
565                 hw_reconf_flags = ~0;
566                 ieee80211_led_radio(local, true);
567                 ieee80211_mod_tpt_led_trig(local,
568                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
569         }
570
571         /*
572          * Copy the hopefully now-present MAC address to
573          * this interface, if it has the special null one.
574          */
575         if (dev && is_zero_ether_addr(dev->dev_addr)) {
576                 memcpy(dev->dev_addr,
577                        local->hw.wiphy->perm_addr,
578                        ETH_ALEN);
579                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
580
581                 if (!is_valid_ether_addr(dev->dev_addr)) {
582                         res = -EADDRNOTAVAIL;
583                         goto err_stop;
584                 }
585         }
586
587         switch (sdata->vif.type) {
588         case NL80211_IFTYPE_AP_VLAN:
589                 /* no need to tell driver, but set carrier */
590                 if (rtnl_dereference(sdata->bss->beacon))
591                         netif_carrier_on(dev);
592                 else
593                         netif_carrier_off(dev);
594                 break;
595         case NL80211_IFTYPE_MONITOR:
596                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
597                         local->cooked_mntrs++;
598                         break;
599                 }
600
601                 if (local->monitors == 0 && local->open_count == 0) {
602                         res = ieee80211_add_virtual_monitor(local);
603                         if (res)
604                                 goto err_stop;
605                 }
606
607                 /* must be before the call to ieee80211_configure_filter */
608                 local->monitors++;
609                 if (local->monitors == 1) {
610                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
611                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
612                 }
613
614                 ieee80211_adjust_monitor_flags(sdata, 1);
615                 ieee80211_configure_filter(local);
616
617                 netif_carrier_on(dev);
618                 break;
619         default:
620                 if (coming_up) {
621                         ieee80211_del_virtual_monitor(local);
622
623                         res = drv_add_interface(local, sdata);
624                         if (res)
625                                 goto err_stop;
626                         res = ieee80211_check_queues(sdata);
627                         if (res)
628                                 goto err_del_interface;
629                 }
630
631                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
632                         local->fif_pspoll++;
633                         local->fif_probe_req++;
634
635                         ieee80211_configure_filter(local);
636                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
637                         local->fif_probe_req++;
638                 }
639
640                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
641                         changed |= ieee80211_reset_erp_info(sdata);
642                 ieee80211_bss_info_change_notify(sdata, changed);
643
644                 switch (sdata->vif.type) {
645                 case NL80211_IFTYPE_STATION:
646                 case NL80211_IFTYPE_ADHOC:
647                 case NL80211_IFTYPE_AP:
648                 case NL80211_IFTYPE_MESH_POINT:
649                         netif_carrier_off(dev);
650                         break;
651                 case NL80211_IFTYPE_WDS:
652                 case NL80211_IFTYPE_P2P_DEVICE:
653                         break;
654                 default:
655                         netif_carrier_on(dev);
656                 }
657
658                 /*
659                  * set default queue parameters so drivers don't
660                  * need to initialise the hardware if the hardware
661                  * doesn't start up with sane defaults
662                  */
663                 ieee80211_set_wmm_default(sdata, true);
664         }
665
666         set_bit(SDATA_STATE_RUNNING, &sdata->state);
667
668         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
669                 /* Create STA entry for the WDS peer */
670                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
671                                      GFP_KERNEL);
672                 if (!sta) {
673                         res = -ENOMEM;
674                         goto err_del_interface;
675                 }
676
677                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
678                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
679                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
680
681                 res = sta_info_insert(sta);
682                 if (res) {
683                         /* STA has been freed */
684                         goto err_del_interface;
685                 }
686
687                 rate_control_rate_init(sta);
688                 netif_carrier_on(dev);
689         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
690                 rcu_assign_pointer(local->p2p_sdata, sdata);
691         }
692
693         /*
694          * set_multicast_list will be invoked by the networking core
695          * which will check whether any increments here were done in
696          * error and sync them down to the hardware as filter flags.
697          */
698         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
699                 atomic_inc(&local->iff_allmultis);
700
701         if (sdata->flags & IEEE80211_SDATA_PROMISC)
702                 atomic_inc(&local->iff_promiscs);
703
704         mutex_lock(&local->mtx);
705         hw_reconf_flags |= __ieee80211_recalc_idle(local);
706         mutex_unlock(&local->mtx);
707
708         if (coming_up)
709                 local->open_count++;
710
711         if (hw_reconf_flags)
712                 ieee80211_hw_config(local, hw_reconf_flags);
713
714         ieee80211_recalc_ps(local, -1);
715
716         if (dev)
717                 netif_tx_start_all_queues(dev);
718
719         return 0;
720  err_del_interface:
721         drv_remove_interface(local, sdata);
722  err_stop:
723         if (!local->open_count)
724                 drv_stop(local);
725  err_del_bss:
726         sdata->bss = NULL;
727         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
728                 list_del(&sdata->u.vlan.list);
729         /* might already be clear but that doesn't matter */
730         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
731         return res;
732 }
733
734 static int ieee80211_open(struct net_device *dev)
735 {
736         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
737         int err;
738
739         /* fail early if user set an invalid address */
740         if (!is_valid_ether_addr(dev->dev_addr))
741                 return -EADDRNOTAVAIL;
742
743         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
744         if (err)
745                 return err;
746
747         return ieee80211_do_open(&sdata->wdev, true);
748 }
749
750 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
751                               bool going_down)
752 {
753         struct ieee80211_local *local = sdata->local;
754         unsigned long flags;
755         struct sk_buff *skb, *tmp;
756         u32 hw_reconf_flags = 0;
757         int i;
758
759         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
760
761         if (rcu_access_pointer(local->scan_sdata) == sdata)
762                 ieee80211_scan_cancel(local);
763
764         /*
765          * Stop TX on this interface first.
766          */
767         if (sdata->dev)
768                 netif_tx_stop_all_queues(sdata->dev);
769
770         ieee80211_roc_purge(sdata);
771
772         /*
773          * Remove all stations associated with this interface.
774          *
775          * This must be done before calling ops->remove_interface()
776          * because otherwise we can later invoke ops->sta_notify()
777          * whenever the STAs are removed, and that invalidates driver
778          * assumptions about always getting a vif pointer that is valid
779          * (because if we remove a STA after ops->remove_interface()
780          * the driver will have removed the vif info already!)
781          *
782          * This is relevant only in AP, WDS and mesh modes, since in
783          * all other modes we've already removed all stations when
784          * disconnecting etc.
785          */
786         sta_info_flush(local, sdata);
787
788         /*
789          * Don't count this interface for promisc/allmulti while it
790          * is down. dev_mc_unsync() will invoke set_multicast_list
791          * on the master interface which will sync these down to the
792          * hardware as filter flags.
793          */
794         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
795                 atomic_dec(&local->iff_allmultis);
796
797         if (sdata->flags & IEEE80211_SDATA_PROMISC)
798                 atomic_dec(&local->iff_promiscs);
799
800         if (sdata->vif.type == NL80211_IFTYPE_AP) {
801                 local->fif_pspoll--;
802                 local->fif_probe_req--;
803         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
804                 local->fif_probe_req--;
805         }
806
807         if (sdata->dev) {
808                 netif_addr_lock_bh(sdata->dev);
809                 spin_lock_bh(&local->filter_lock);
810                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
811                                  sdata->dev->addr_len);
812                 spin_unlock_bh(&local->filter_lock);
813                 netif_addr_unlock_bh(sdata->dev);
814
815                 ieee80211_configure_filter(local);
816         }
817
818         del_timer_sync(&local->dynamic_ps_timer);
819         cancel_work_sync(&local->dynamic_ps_enable_work);
820
821         cancel_work_sync(&sdata->recalc_smps);
822
823         /* APs need special treatment */
824         if (sdata->vif.type == NL80211_IFTYPE_AP) {
825                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
826
827                 /* down all dependent devices, that is VLANs */
828                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
829                                          u.vlan.list)
830                         dev_close(vlan->dev);
831                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
832         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
833                 ieee80211_mgd_stop(sdata);
834         }
835
836         if (going_down)
837                 local->open_count--;
838
839         switch (sdata->vif.type) {
840         case NL80211_IFTYPE_AP_VLAN:
841                 list_del(&sdata->u.vlan.list);
842                 /* no need to tell driver */
843                 break;
844         case NL80211_IFTYPE_MONITOR:
845                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
846                         local->cooked_mntrs--;
847                         break;
848                 }
849
850                 local->monitors--;
851                 if (local->monitors == 0) {
852                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
853                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
854                         ieee80211_del_virtual_monitor(local);
855                 }
856
857                 ieee80211_adjust_monitor_flags(sdata, -1);
858                 ieee80211_configure_filter(local);
859                 break;
860         case NL80211_IFTYPE_P2P_DEVICE:
861                 /* relies on synchronize_rcu() below */
862                 rcu_assign_pointer(local->p2p_sdata, NULL);
863                 /* fall through */
864         default:
865                 cancel_work_sync(&sdata->work);
866                 /*
867                  * When we get here, the interface is marked down.
868                  * Call rcu_barrier() to wait both for the RX path
869                  * should it be using the interface and enqueuing
870                  * frames at this very time on another CPU, and
871                  * for the sta free call_rcu callbacks.
872                  */
873                 rcu_barrier();
874
875                 /*
876                  * free_sta_rcu() enqueues a work for the actual
877                  * sta cleanup, so we need to flush it while
878                  * sdata is still valid.
879                  */
880                 flush_workqueue(local->workqueue);
881
882                 skb_queue_purge(&sdata->skb_queue);
883
884                 /*
885                  * Free all remaining keys, there shouldn't be any,
886                  * except maybe group keys in AP more or WDS?
887                  */
888                 ieee80211_free_keys(sdata);
889
890                 if (going_down)
891                         drv_remove_interface(local, sdata);
892         }
893
894         sdata->bss = NULL;
895
896         mutex_lock(&local->mtx);
897         hw_reconf_flags |= __ieee80211_recalc_idle(local);
898         mutex_unlock(&local->mtx);
899
900         ieee80211_recalc_ps(local, -1);
901
902         if (local->open_count == 0) {
903                 if (local->ops->napi_poll)
904                         napi_disable(&local->napi);
905                 ieee80211_clear_tx_pending(local);
906                 ieee80211_stop_device(local);
907
908                 /* no reconfiguring after stop! */
909                 hw_reconf_flags = 0;
910         }
911
912         /* do after stop to avoid reconfiguring when we stop anyway */
913         if (hw_reconf_flags)
914                 ieee80211_hw_config(local, hw_reconf_flags);
915
916         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
917         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
918                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
919                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920                         if (info->control.vif == &sdata->vif) {
921                                 __skb_unlink(skb, &local->pending[i]);
922                                 ieee80211_free_txskb(&local->hw, skb);
923                         }
924                 }
925         }
926         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
927
928         if (local->monitors == local->open_count && local->monitors > 0)
929                 ieee80211_add_virtual_monitor(local);
930 }
931
932 static int ieee80211_stop(struct net_device *dev)
933 {
934         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
935
936         ieee80211_do_stop(sdata, true);
937
938         return 0;
939 }
940
941 static void ieee80211_set_multicast_list(struct net_device *dev)
942 {
943         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
944         struct ieee80211_local *local = sdata->local;
945         int allmulti, promisc, sdata_allmulti, sdata_promisc;
946
947         allmulti = !!(dev->flags & IFF_ALLMULTI);
948         promisc = !!(dev->flags & IFF_PROMISC);
949         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
950         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
951
952         if (allmulti != sdata_allmulti) {
953                 if (dev->flags & IFF_ALLMULTI)
954                         atomic_inc(&local->iff_allmultis);
955                 else
956                         atomic_dec(&local->iff_allmultis);
957                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
958         }
959
960         if (promisc != sdata_promisc) {
961                 if (dev->flags & IFF_PROMISC)
962                         atomic_inc(&local->iff_promiscs);
963                 else
964                         atomic_dec(&local->iff_promiscs);
965                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
966         }
967         spin_lock_bh(&local->filter_lock);
968         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
969         spin_unlock_bh(&local->filter_lock);
970         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
971 }
972
973 /*
974  * Called when the netdev is removed or, by the code below, before
975  * the interface type changes.
976  */
977 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
978 {
979         struct ieee80211_local *local = sdata->local;
980         int flushed;
981         int i;
982
983         /* free extra data */
984         ieee80211_free_keys(sdata);
985
986         ieee80211_debugfs_remove_netdev(sdata);
987
988         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
989                 __skb_queue_purge(&sdata->fragments[i].skb_list);
990         sdata->fragment_next = 0;
991
992         if (ieee80211_vif_is_mesh(&sdata->vif))
993                 mesh_rmc_free(sdata);
994
995         flushed = sta_info_flush(local, sdata);
996         WARN_ON(flushed);
997 }
998
999 static void ieee80211_uninit(struct net_device *dev)
1000 {
1001         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1002 }
1003
1004 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1005                                          struct sk_buff *skb)
1006 {
1007         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1008 }
1009
1010 static const struct net_device_ops ieee80211_dataif_ops = {
1011         .ndo_open               = ieee80211_open,
1012         .ndo_stop               = ieee80211_stop,
1013         .ndo_uninit             = ieee80211_uninit,
1014         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1015         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1016         .ndo_change_mtu         = ieee80211_change_mtu,
1017         .ndo_set_mac_address    = ieee80211_change_mac,
1018         .ndo_select_queue       = ieee80211_netdev_select_queue,
1019 };
1020
1021 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1022                                           struct sk_buff *skb)
1023 {
1024         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1025         struct ieee80211_local *local = sdata->local;
1026         struct ieee80211_hdr *hdr;
1027         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1028
1029         if (local->hw.queues < IEEE80211_NUM_ACS)
1030                 return 0;
1031
1032         if (skb->len < 4 ||
1033             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1034                 return 0; /* doesn't matter, frame will be dropped */
1035
1036         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1037
1038         return ieee80211_select_queue_80211(sdata, skb, hdr);
1039 }
1040
1041 static const struct net_device_ops ieee80211_monitorif_ops = {
1042         .ndo_open               = ieee80211_open,
1043         .ndo_stop               = ieee80211_stop,
1044         .ndo_uninit             = ieee80211_uninit,
1045         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1046         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1047         .ndo_change_mtu         = ieee80211_change_mtu,
1048         .ndo_set_mac_address    = eth_mac_addr,
1049         .ndo_select_queue       = ieee80211_monitor_select_queue,
1050 };
1051
1052 static void ieee80211_if_setup(struct net_device *dev)
1053 {
1054         ether_setup(dev);
1055         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1056         dev->netdev_ops = &ieee80211_dataif_ops;
1057         dev->destructor = free_netdev;
1058 }
1059
1060 static void ieee80211_iface_work(struct work_struct *work)
1061 {
1062         struct ieee80211_sub_if_data *sdata =
1063                 container_of(work, struct ieee80211_sub_if_data, work);
1064         struct ieee80211_local *local = sdata->local;
1065         struct sk_buff *skb;
1066         struct sta_info *sta;
1067         struct ieee80211_ra_tid *ra_tid;
1068
1069         if (!ieee80211_sdata_running(sdata))
1070                 return;
1071
1072         if (local->scanning)
1073                 return;
1074
1075         /*
1076          * ieee80211_queue_work() should have picked up most cases,
1077          * here we'll pick the rest.
1078          */
1079         if (WARN(local->suspended,
1080                  "interface work scheduled while going to suspend\n"))
1081                 return;
1082
1083         /* first process frames */
1084         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1085                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1086
1087                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1088                         ra_tid = (void *)&skb->cb;
1089                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1090                                                  ra_tid->tid);
1091                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1092                         ra_tid = (void *)&skb->cb;
1093                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1094                                                 ra_tid->tid);
1095                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1096                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1097                         int len = skb->len;
1098
1099                         mutex_lock(&local->sta_mtx);
1100                         sta = sta_info_get_bss(sdata, mgmt->sa);
1101                         if (sta) {
1102                                 switch (mgmt->u.action.u.addba_req.action_code) {
1103                                 case WLAN_ACTION_ADDBA_REQ:
1104                                         ieee80211_process_addba_request(
1105                                                         local, sta, mgmt, len);
1106                                         break;
1107                                 case WLAN_ACTION_ADDBA_RESP:
1108                                         ieee80211_process_addba_resp(local, sta,
1109                                                                      mgmt, len);
1110                                         break;
1111                                 case WLAN_ACTION_DELBA:
1112                                         ieee80211_process_delba(sdata, sta,
1113                                                                 mgmt, len);
1114                                         break;
1115                                 default:
1116                                         WARN_ON(1);
1117                                         break;
1118                                 }
1119                         }
1120                         mutex_unlock(&local->sta_mtx);
1121                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1122                         struct ieee80211_hdr *hdr = (void *)mgmt;
1123                         /*
1124                          * So the frame isn't mgmt, but frame_control
1125                          * is at the right place anyway, of course, so
1126                          * the if statement is correct.
1127                          *
1128                          * Warn if we have other data frame types here,
1129                          * they must not get here.
1130                          */
1131                         WARN_ON(hdr->frame_control &
1132                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1133                         WARN_ON(!(hdr->seq_ctrl &
1134                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1135                         /*
1136                          * This was a fragment of a frame, received while
1137                          * a block-ack session was active. That cannot be
1138                          * right, so terminate the session.
1139                          */
1140                         mutex_lock(&local->sta_mtx);
1141                         sta = sta_info_get_bss(sdata, mgmt->sa);
1142                         if (sta) {
1143                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1144                                                 IEEE80211_QOS_CTL_TID_MASK;
1145
1146                                 __ieee80211_stop_rx_ba_session(
1147                                         sta, tid, WLAN_BACK_RECIPIENT,
1148                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1149                                         true);
1150                         }
1151                         mutex_unlock(&local->sta_mtx);
1152                 } else switch (sdata->vif.type) {
1153                 case NL80211_IFTYPE_STATION:
1154                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1155                         break;
1156                 case NL80211_IFTYPE_ADHOC:
1157                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1158                         break;
1159                 case NL80211_IFTYPE_MESH_POINT:
1160                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1161                                 break;
1162                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1163                         break;
1164                 default:
1165                         WARN(1, "frame for unexpected interface type");
1166                         break;
1167                 }
1168
1169                 kfree_skb(skb);
1170         }
1171
1172         /* then other type-dependent work */
1173         switch (sdata->vif.type) {
1174         case NL80211_IFTYPE_STATION:
1175                 ieee80211_sta_work(sdata);
1176                 break;
1177         case NL80211_IFTYPE_ADHOC:
1178                 ieee80211_ibss_work(sdata);
1179                 break;
1180         case NL80211_IFTYPE_MESH_POINT:
1181                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1182                         break;
1183                 ieee80211_mesh_work(sdata);
1184                 break;
1185         default:
1186                 break;
1187         }
1188 }
1189
1190 static void ieee80211_recalc_smps_work(struct work_struct *work)
1191 {
1192         struct ieee80211_sub_if_data *sdata =
1193                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1194
1195         ieee80211_recalc_smps(sdata);
1196 }
1197
1198 /*
1199  * Helper function to initialise an interface to a specific type.
1200  */
1201 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1202                                   enum nl80211_iftype type)
1203 {
1204         /* clear type-dependent union */
1205         memset(&sdata->u, 0, sizeof(sdata->u));
1206
1207         /* and set some type-dependent values */
1208         sdata->vif.type = type;
1209         sdata->vif.p2p = false;
1210         sdata->wdev.iftype = type;
1211
1212         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1213         sdata->control_port_no_encrypt = false;
1214
1215         sdata->noack_map = 0;
1216
1217         /* only monitor/p2p-device differ */
1218         if (sdata->dev) {
1219                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1220                 sdata->dev->type = ARPHRD_ETHER;
1221         }
1222
1223         skb_queue_head_init(&sdata->skb_queue);
1224         INIT_WORK(&sdata->work, ieee80211_iface_work);
1225         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1226
1227         switch (type) {
1228         case NL80211_IFTYPE_P2P_GO:
1229                 type = NL80211_IFTYPE_AP;
1230                 sdata->vif.type = type;
1231                 sdata->vif.p2p = true;
1232                 /* fall through */
1233         case NL80211_IFTYPE_AP:
1234                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1235                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1236                 break;
1237         case NL80211_IFTYPE_P2P_CLIENT:
1238                 type = NL80211_IFTYPE_STATION;
1239                 sdata->vif.type = type;
1240                 sdata->vif.p2p = true;
1241                 /* fall through */
1242         case NL80211_IFTYPE_STATION:
1243                 ieee80211_sta_setup_sdata(sdata);
1244                 break;
1245         case NL80211_IFTYPE_ADHOC:
1246                 ieee80211_ibss_setup_sdata(sdata);
1247                 break;
1248         case NL80211_IFTYPE_MESH_POINT:
1249                 if (ieee80211_vif_is_mesh(&sdata->vif))
1250                         ieee80211_mesh_init_sdata(sdata);
1251                 break;
1252         case NL80211_IFTYPE_MONITOR:
1253                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1254                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1255                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1256                                       MONITOR_FLAG_OTHER_BSS;
1257                 break;
1258         case NL80211_IFTYPE_WDS:
1259         case NL80211_IFTYPE_AP_VLAN:
1260         case NL80211_IFTYPE_P2P_DEVICE:
1261                 break;
1262         case NL80211_IFTYPE_UNSPECIFIED:
1263         case NUM_NL80211_IFTYPES:
1264                 BUG();
1265                 break;
1266         }
1267
1268         ieee80211_debugfs_add_netdev(sdata);
1269 }
1270
1271 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1272                                            enum nl80211_iftype type)
1273 {
1274         struct ieee80211_local *local = sdata->local;
1275         int ret, err;
1276         enum nl80211_iftype internal_type = type;
1277         bool p2p = false;
1278
1279         ASSERT_RTNL();
1280
1281         if (!local->ops->change_interface)
1282                 return -EBUSY;
1283
1284         switch (sdata->vif.type) {
1285         case NL80211_IFTYPE_AP:
1286         case NL80211_IFTYPE_STATION:
1287         case NL80211_IFTYPE_ADHOC:
1288                 /*
1289                  * Could maybe also all others here?
1290                  * Just not sure how that interacts
1291                  * with the RX/config path e.g. for
1292                  * mesh.
1293                  */
1294                 break;
1295         default:
1296                 return -EBUSY;
1297         }
1298
1299         switch (type) {
1300         case NL80211_IFTYPE_AP:
1301         case NL80211_IFTYPE_STATION:
1302         case NL80211_IFTYPE_ADHOC:
1303                 /*
1304                  * Could probably support everything
1305                  * but WDS here (WDS do_open can fail
1306                  * under memory pressure, which this
1307                  * code isn't prepared to handle).
1308                  */
1309                 break;
1310         case NL80211_IFTYPE_P2P_CLIENT:
1311                 p2p = true;
1312                 internal_type = NL80211_IFTYPE_STATION;
1313                 break;
1314         case NL80211_IFTYPE_P2P_GO:
1315                 p2p = true;
1316                 internal_type = NL80211_IFTYPE_AP;
1317                 break;
1318         default:
1319                 return -EBUSY;
1320         }
1321
1322         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1323         if (ret)
1324                 return ret;
1325
1326         ieee80211_do_stop(sdata, false);
1327
1328         ieee80211_teardown_sdata(sdata);
1329
1330         ret = drv_change_interface(local, sdata, internal_type, p2p);
1331         if (ret)
1332                 type = sdata->vif.type;
1333
1334         /*
1335          * Ignore return value here, there's not much we can do since
1336          * the driver changed the interface type internally already.
1337          * The warnings will hopefully make driver authors fix it :-)
1338          */
1339         ieee80211_check_queues(sdata);
1340
1341         ieee80211_setup_sdata(sdata, type);
1342
1343         err = ieee80211_do_open(&sdata->wdev, false);
1344         WARN(err, "type change: do_open returned %d", err);
1345
1346         return ret;
1347 }
1348
1349 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1350                              enum nl80211_iftype type)
1351 {
1352         int ret;
1353
1354         ASSERT_RTNL();
1355
1356         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1357                 return 0;
1358
1359         if (ieee80211_sdata_running(sdata)) {
1360                 ret = ieee80211_runtime_change_iftype(sdata, type);
1361                 if (ret)
1362                         return ret;
1363         } else {
1364                 /* Purge and reset type-dependent state. */
1365                 ieee80211_teardown_sdata(sdata);
1366                 ieee80211_setup_sdata(sdata, type);
1367         }
1368
1369         /* reset some values that shouldn't be kept across type changes */
1370         sdata->drop_unencrypted = 0;
1371         if (type == NL80211_IFTYPE_STATION)
1372                 sdata->u.mgd.use_4addr = false;
1373
1374         return 0;
1375 }
1376
1377 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1378                                        u8 *perm_addr, enum nl80211_iftype type)
1379 {
1380         struct ieee80211_sub_if_data *sdata;
1381         u64 mask, start, addr, val, inc;
1382         u8 *m;
1383         u8 tmp_addr[ETH_ALEN];
1384         int i;
1385
1386         /* default ... something at least */
1387         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1388
1389         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1390             local->hw.wiphy->n_addresses <= 1)
1391                 return;
1392
1393         mutex_lock(&local->iflist_mtx);
1394
1395         switch (type) {
1396         case NL80211_IFTYPE_MONITOR:
1397                 /* doesn't matter */
1398                 break;
1399         case NL80211_IFTYPE_WDS:
1400         case NL80211_IFTYPE_AP_VLAN:
1401                 /* match up with an AP interface */
1402                 list_for_each_entry(sdata, &local->interfaces, list) {
1403                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1404                                 continue;
1405                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1406                         break;
1407                 }
1408                 /* keep default if no AP interface present */
1409                 break;
1410         case NL80211_IFTYPE_P2P_CLIENT:
1411         case NL80211_IFTYPE_P2P_GO:
1412                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1413                         list_for_each_entry(sdata, &local->interfaces, list) {
1414                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1415                                         continue;
1416                                 if (!ieee80211_sdata_running(sdata))
1417                                         continue;
1418                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1419                                 goto out_unlock;
1420                         }
1421                 }
1422                 /* otherwise fall through */
1423         default:
1424                 /* assign a new address if possible -- try n_addresses first */
1425                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1426                         bool used = false;
1427
1428                         list_for_each_entry(sdata, &local->interfaces, list) {
1429                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1430                                            sdata->vif.addr, ETH_ALEN) == 0) {
1431                                         used = true;
1432                                         break;
1433                                 }
1434                         }
1435
1436                         if (!used) {
1437                                 memcpy(perm_addr,
1438                                        local->hw.wiphy->addresses[i].addr,
1439                                        ETH_ALEN);
1440                                 break;
1441                         }
1442                 }
1443
1444                 /* try mask if available */
1445                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1446                         break;
1447
1448                 m = local->hw.wiphy->addr_mask;
1449                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1450                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1451                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1452
1453                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1454                         /* not a contiguous mask ... not handled now! */
1455                         pr_info("not contiguous\n");
1456                         break;
1457                 }
1458
1459                 m = local->hw.wiphy->perm_addr;
1460                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1461                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1462                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1463
1464                 inc = 1ULL<<__ffs64(mask);
1465                 val = (start & mask);
1466                 addr = (start & ~mask) | (val & mask);
1467                 do {
1468                         bool used = false;
1469
1470                         tmp_addr[5] = addr >> 0*8;
1471                         tmp_addr[4] = addr >> 1*8;
1472                         tmp_addr[3] = addr >> 2*8;
1473                         tmp_addr[2] = addr >> 3*8;
1474                         tmp_addr[1] = addr >> 4*8;
1475                         tmp_addr[0] = addr >> 5*8;
1476
1477                         val += inc;
1478
1479                         list_for_each_entry(sdata, &local->interfaces, list) {
1480                                 if (memcmp(tmp_addr, sdata->vif.addr,
1481                                                         ETH_ALEN) == 0) {
1482                                         used = true;
1483                                         break;
1484                                 }
1485                         }
1486
1487                         if (!used) {
1488                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1489                                 break;
1490                         }
1491                         addr = (start & ~mask) | (val & mask);
1492                 } while (addr != start);
1493
1494                 break;
1495         }
1496
1497  out_unlock:
1498         mutex_unlock(&local->iflist_mtx);
1499 }
1500
1501 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1502                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1503                      struct vif_params *params)
1504 {
1505         struct net_device *ndev = NULL;
1506         struct ieee80211_sub_if_data *sdata = NULL;
1507         int ret, i;
1508         int txqs = 1;
1509
1510         ASSERT_RTNL();
1511
1512         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1513                 struct wireless_dev *wdev;
1514
1515                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1516                                 GFP_KERNEL);
1517                 if (!sdata)
1518                         return -ENOMEM;
1519                 wdev = &sdata->wdev;
1520
1521                 sdata->dev = NULL;
1522                 strlcpy(sdata->name, name, IFNAMSIZ);
1523                 ieee80211_assign_perm_addr(local, wdev->address, type);
1524                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1525         } else {
1526                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1527                         txqs = IEEE80211_NUM_ACS;
1528
1529                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1530                                         local->hw.vif_data_size,
1531                                         name, ieee80211_if_setup, txqs, 1);
1532                 if (!ndev)
1533                         return -ENOMEM;
1534                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1535
1536                 ndev->needed_headroom = local->tx_headroom +
1537                                         4*6 /* four MAC addresses */
1538                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1539                                         + 6 /* mesh */
1540                                         + 8 /* rfc1042/bridge tunnel */
1541                                         - ETH_HLEN /* ethernet hard_header_len */
1542                                         + IEEE80211_ENCRYPT_HEADROOM;
1543                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1544
1545                 ret = dev_alloc_name(ndev, ndev->name);
1546                 if (ret < 0) {
1547                         free_netdev(ndev);
1548                         return ret;
1549                 }
1550
1551                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1552                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1553                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1554
1555                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1556                 sdata = netdev_priv(ndev);
1557                 ndev->ieee80211_ptr = &sdata->wdev;
1558                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1559                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1560
1561                 sdata->dev = ndev;
1562         }
1563
1564         /* initialise type-independent data */
1565         sdata->wdev.wiphy = local->hw.wiphy;
1566         sdata->local = local;
1567 #ifdef CONFIG_INET
1568         sdata->arp_filter_state = true;
1569 #endif
1570
1571         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1572                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1573
1574         INIT_LIST_HEAD(&sdata->key_list);
1575
1576         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1577                 struct ieee80211_supported_band *sband;
1578                 sband = local->hw.wiphy->bands[i];
1579                 sdata->rc_rateidx_mask[i] =
1580                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1581                 if (sband)
1582                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1583                                sband->ht_cap.mcs.rx_mask,
1584                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1585                 else
1586                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1587                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1588         }
1589
1590         ieee80211_set_default_queues(sdata);
1591
1592         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1593         sdata->user_power_level = local->user_power_level;
1594
1595         /* setup type-dependent data */
1596         ieee80211_setup_sdata(sdata, type);
1597
1598         if (ndev) {
1599                 if (params) {
1600                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1601                         if (type == NL80211_IFTYPE_STATION)
1602                                 sdata->u.mgd.use_4addr = params->use_4addr;
1603                 }
1604
1605                 ndev->features |= local->hw.netdev_features;
1606
1607                 ret = register_netdevice(ndev);
1608                 if (ret) {
1609                         free_netdev(ndev);
1610                         return ret;
1611                 }
1612         }
1613
1614         mutex_lock(&local->iflist_mtx);
1615         list_add_tail_rcu(&sdata->list, &local->interfaces);
1616         mutex_unlock(&local->iflist_mtx);
1617
1618         if (new_wdev)
1619                 *new_wdev = &sdata->wdev;
1620
1621         return 0;
1622 }
1623
1624 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1625 {
1626         ASSERT_RTNL();
1627
1628         mutex_lock(&sdata->local->iflist_mtx);
1629         list_del_rcu(&sdata->list);
1630         mutex_unlock(&sdata->local->iflist_mtx);
1631
1632         synchronize_rcu();
1633
1634         if (sdata->dev) {
1635                 unregister_netdevice(sdata->dev);
1636         } else {
1637                 cfg80211_unregister_wdev(&sdata->wdev);
1638                 kfree(sdata);
1639         }
1640 }
1641
1642 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1643 {
1644         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1645                 return;
1646         ieee80211_do_stop(sdata, true);
1647         ieee80211_teardown_sdata(sdata);
1648 }
1649
1650 /*
1651  * Remove all interfaces, may only be called at hardware unregistration
1652  * time because it doesn't do RCU-safe list removals.
1653  */
1654 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1655 {
1656         struct ieee80211_sub_if_data *sdata, *tmp;
1657         LIST_HEAD(unreg_list);
1658         LIST_HEAD(wdev_list);
1659
1660         ASSERT_RTNL();
1661
1662         mutex_lock(&local->iflist_mtx);
1663         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1664                 list_del(&sdata->list);
1665
1666                 if (sdata->dev)
1667                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1668                 else
1669                         list_add(&sdata->list, &wdev_list);
1670         }
1671         mutex_unlock(&local->iflist_mtx);
1672         unregister_netdevice_many(&unreg_list);
1673         list_del(&unreg_list);
1674
1675         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1676                 list_del(&sdata->list);
1677                 cfg80211_unregister_wdev(&sdata->wdev);
1678                 kfree(sdata);
1679         }
1680 }
1681
1682 static int netdev_notify(struct notifier_block *nb,
1683                          unsigned long state,
1684                          void *ndev)
1685 {
1686         struct net_device *dev = ndev;
1687         struct ieee80211_sub_if_data *sdata;
1688
1689         if (state != NETDEV_CHANGENAME)
1690                 return 0;
1691
1692         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1693                 return 0;
1694
1695         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1696                 return 0;
1697
1698         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1699
1700         memcpy(sdata->name, dev->name, IFNAMSIZ);
1701
1702         ieee80211_debugfs_rename_netdev(sdata);
1703         return 0;
1704 }
1705
1706 static struct notifier_block mac80211_netdev_notifier = {
1707         .notifier_call = netdev_notify,
1708 };
1709
1710 int ieee80211_iface_init(void)
1711 {
1712         return register_netdevice_notifier(&mac80211_netdev_notifier);
1713 }
1714
1715 void ieee80211_iface_exit(void)
1716 {
1717         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1718 }