mac80211: assign VLAN channel contexts
[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 and chanctx */
590                 if (rtnl_dereference(sdata->bss->beacon)) {
591                         ieee80211_vif_vlan_copy_chanctx(sdata);
592                         netif_carrier_on(dev);
593                 } else {
594                         netif_carrier_off(dev);
595                 }
596                 break;
597         case NL80211_IFTYPE_MONITOR:
598                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
599                         local->cooked_mntrs++;
600                         break;
601                 }
602
603                 if (local->monitors == 0 && local->open_count == 0) {
604                         res = ieee80211_add_virtual_monitor(local);
605                         if (res)
606                                 goto err_stop;
607                 }
608
609                 /* must be before the call to ieee80211_configure_filter */
610                 local->monitors++;
611                 if (local->monitors == 1) {
612                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
613                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
614                 }
615
616                 ieee80211_adjust_monitor_flags(sdata, 1);
617                 ieee80211_configure_filter(local);
618
619                 netif_carrier_on(dev);
620                 break;
621         default:
622                 if (coming_up) {
623                         ieee80211_del_virtual_monitor(local);
624
625                         res = drv_add_interface(local, sdata);
626                         if (res)
627                                 goto err_stop;
628                         res = ieee80211_check_queues(sdata);
629                         if (res)
630                                 goto err_del_interface;
631                 }
632
633                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
634                         local->fif_pspoll++;
635                         local->fif_probe_req++;
636
637                         ieee80211_configure_filter(local);
638                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
639                         local->fif_probe_req++;
640                 }
641
642                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
643                         changed |= ieee80211_reset_erp_info(sdata);
644                 ieee80211_bss_info_change_notify(sdata, changed);
645
646                 switch (sdata->vif.type) {
647                 case NL80211_IFTYPE_STATION:
648                 case NL80211_IFTYPE_ADHOC:
649                 case NL80211_IFTYPE_AP:
650                 case NL80211_IFTYPE_MESH_POINT:
651                         netif_carrier_off(dev);
652                         break;
653                 case NL80211_IFTYPE_WDS:
654                 case NL80211_IFTYPE_P2P_DEVICE:
655                         break;
656                 default:
657                         netif_carrier_on(dev);
658                 }
659
660                 /*
661                  * set default queue parameters so drivers don't
662                  * need to initialise the hardware if the hardware
663                  * doesn't start up with sane defaults
664                  */
665                 ieee80211_set_wmm_default(sdata, true);
666         }
667
668         set_bit(SDATA_STATE_RUNNING, &sdata->state);
669
670         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
671                 /* Create STA entry for the WDS peer */
672                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
673                                      GFP_KERNEL);
674                 if (!sta) {
675                         res = -ENOMEM;
676                         goto err_del_interface;
677                 }
678
679                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
680                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
681                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
682
683                 res = sta_info_insert(sta);
684                 if (res) {
685                         /* STA has been freed */
686                         goto err_del_interface;
687                 }
688
689                 rate_control_rate_init(sta);
690                 netif_carrier_on(dev);
691         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
692                 rcu_assign_pointer(local->p2p_sdata, sdata);
693         }
694
695         /*
696          * set_multicast_list will be invoked by the networking core
697          * which will check whether any increments here were done in
698          * error and sync them down to the hardware as filter flags.
699          */
700         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
701                 atomic_inc(&local->iff_allmultis);
702
703         if (sdata->flags & IEEE80211_SDATA_PROMISC)
704                 atomic_inc(&local->iff_promiscs);
705
706         mutex_lock(&local->mtx);
707         hw_reconf_flags |= __ieee80211_recalc_idle(local);
708         mutex_unlock(&local->mtx);
709
710         if (coming_up)
711                 local->open_count++;
712
713         if (hw_reconf_flags)
714                 ieee80211_hw_config(local, hw_reconf_flags);
715
716         ieee80211_recalc_ps(local, -1);
717
718         if (dev)
719                 netif_tx_start_all_queues(dev);
720
721         return 0;
722  err_del_interface:
723         drv_remove_interface(local, sdata);
724  err_stop:
725         if (!local->open_count)
726                 drv_stop(local);
727  err_del_bss:
728         sdata->bss = NULL;
729         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
730                 list_del(&sdata->u.vlan.list);
731         /* might already be clear but that doesn't matter */
732         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
733         return res;
734 }
735
736 static int ieee80211_open(struct net_device *dev)
737 {
738         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
739         int err;
740
741         /* fail early if user set an invalid address */
742         if (!is_valid_ether_addr(dev->dev_addr))
743                 return -EADDRNOTAVAIL;
744
745         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
746         if (err)
747                 return err;
748
749         return ieee80211_do_open(&sdata->wdev, true);
750 }
751
752 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
753                               bool going_down)
754 {
755         struct ieee80211_local *local = sdata->local;
756         unsigned long flags;
757         struct sk_buff *skb, *tmp;
758         u32 hw_reconf_flags = 0;
759         int i;
760
761         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
762
763         if (rcu_access_pointer(local->scan_sdata) == sdata)
764                 ieee80211_scan_cancel(local);
765
766         /*
767          * Stop TX on this interface first.
768          */
769         if (sdata->dev)
770                 netif_tx_stop_all_queues(sdata->dev);
771
772         ieee80211_roc_purge(sdata);
773
774         /*
775          * Remove all stations associated with this interface.
776          *
777          * This must be done before calling ops->remove_interface()
778          * because otherwise we can later invoke ops->sta_notify()
779          * whenever the STAs are removed, and that invalidates driver
780          * assumptions about always getting a vif pointer that is valid
781          * (because if we remove a STA after ops->remove_interface()
782          * the driver will have removed the vif info already!)
783          *
784          * This is relevant only in AP, WDS and mesh modes, since in
785          * all other modes we've already removed all stations when
786          * disconnecting etc.
787          */
788         sta_info_flush(local, sdata);
789
790         /*
791          * Don't count this interface for promisc/allmulti while it
792          * is down. dev_mc_unsync() will invoke set_multicast_list
793          * on the master interface which will sync these down to the
794          * hardware as filter flags.
795          */
796         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
797                 atomic_dec(&local->iff_allmultis);
798
799         if (sdata->flags & IEEE80211_SDATA_PROMISC)
800                 atomic_dec(&local->iff_promiscs);
801
802         if (sdata->vif.type == NL80211_IFTYPE_AP) {
803                 local->fif_pspoll--;
804                 local->fif_probe_req--;
805         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
806                 local->fif_probe_req--;
807         }
808
809         if (sdata->dev) {
810                 netif_addr_lock_bh(sdata->dev);
811                 spin_lock_bh(&local->filter_lock);
812                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
813                                  sdata->dev->addr_len);
814                 spin_unlock_bh(&local->filter_lock);
815                 netif_addr_unlock_bh(sdata->dev);
816
817                 ieee80211_configure_filter(local);
818         }
819
820         del_timer_sync(&local->dynamic_ps_timer);
821         cancel_work_sync(&local->dynamic_ps_enable_work);
822
823         cancel_work_sync(&sdata->recalc_smps);
824
825         /* APs need special treatment */
826         if (sdata->vif.type == NL80211_IFTYPE_AP) {
827                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
828
829                 /* down all dependent devices, that is VLANs */
830                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
831                                          u.vlan.list)
832                         dev_close(vlan->dev);
833                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
834         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
835                 ieee80211_mgd_stop(sdata);
836         }
837
838         if (going_down)
839                 local->open_count--;
840
841         switch (sdata->vif.type) {
842         case NL80211_IFTYPE_AP_VLAN:
843                 list_del(&sdata->u.vlan.list);
844                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
845                 /* no need to tell driver */
846                 break;
847         case NL80211_IFTYPE_MONITOR:
848                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
849                         local->cooked_mntrs--;
850                         break;
851                 }
852
853                 local->monitors--;
854                 if (local->monitors == 0) {
855                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
856                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
857                         ieee80211_del_virtual_monitor(local);
858                 }
859
860                 ieee80211_adjust_monitor_flags(sdata, -1);
861                 ieee80211_configure_filter(local);
862                 break;
863         case NL80211_IFTYPE_P2P_DEVICE:
864                 /* relies on synchronize_rcu() below */
865                 rcu_assign_pointer(local->p2p_sdata, NULL);
866                 /* fall through */
867         default:
868                 cancel_work_sync(&sdata->work);
869                 /*
870                  * When we get here, the interface is marked down.
871                  * Call rcu_barrier() to wait both for the RX path
872                  * should it be using the interface and enqueuing
873                  * frames at this very time on another CPU, and
874                  * for the sta free call_rcu callbacks.
875                  */
876                 rcu_barrier();
877
878                 /*
879                  * free_sta_rcu() enqueues a work for the actual
880                  * sta cleanup, so we need to flush it while
881                  * sdata is still valid.
882                  */
883                 flush_workqueue(local->workqueue);
884
885                 skb_queue_purge(&sdata->skb_queue);
886
887                 /*
888                  * Free all remaining keys, there shouldn't be any,
889                  * except maybe group keys in AP more or WDS?
890                  */
891                 ieee80211_free_keys(sdata);
892
893                 if (going_down)
894                         drv_remove_interface(local, sdata);
895         }
896
897         sdata->bss = NULL;
898
899         mutex_lock(&local->mtx);
900         hw_reconf_flags |= __ieee80211_recalc_idle(local);
901         mutex_unlock(&local->mtx);
902
903         ieee80211_recalc_ps(local, -1);
904
905         if (local->open_count == 0) {
906                 if (local->ops->napi_poll)
907                         napi_disable(&local->napi);
908                 ieee80211_clear_tx_pending(local);
909                 ieee80211_stop_device(local);
910
911                 /* no reconfiguring after stop! */
912                 hw_reconf_flags = 0;
913         }
914
915         /* do after stop to avoid reconfiguring when we stop anyway */
916         if (hw_reconf_flags)
917                 ieee80211_hw_config(local, hw_reconf_flags);
918
919         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
920         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
921                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
922                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
923                         if (info->control.vif == &sdata->vif) {
924                                 __skb_unlink(skb, &local->pending[i]);
925                                 ieee80211_free_txskb(&local->hw, skb);
926                         }
927                 }
928         }
929         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
930
931         if (local->monitors == local->open_count && local->monitors > 0)
932                 ieee80211_add_virtual_monitor(local);
933 }
934
935 static int ieee80211_stop(struct net_device *dev)
936 {
937         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
938
939         ieee80211_do_stop(sdata, true);
940
941         return 0;
942 }
943
944 static void ieee80211_set_multicast_list(struct net_device *dev)
945 {
946         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
947         struct ieee80211_local *local = sdata->local;
948         int allmulti, promisc, sdata_allmulti, sdata_promisc;
949
950         allmulti = !!(dev->flags & IFF_ALLMULTI);
951         promisc = !!(dev->flags & IFF_PROMISC);
952         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
953         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
954
955         if (allmulti != sdata_allmulti) {
956                 if (dev->flags & IFF_ALLMULTI)
957                         atomic_inc(&local->iff_allmultis);
958                 else
959                         atomic_dec(&local->iff_allmultis);
960                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
961         }
962
963         if (promisc != sdata_promisc) {
964                 if (dev->flags & IFF_PROMISC)
965                         atomic_inc(&local->iff_promiscs);
966                 else
967                         atomic_dec(&local->iff_promiscs);
968                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
969         }
970         spin_lock_bh(&local->filter_lock);
971         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
972         spin_unlock_bh(&local->filter_lock);
973         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
974 }
975
976 /*
977  * Called when the netdev is removed or, by the code below, before
978  * the interface type changes.
979  */
980 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
981 {
982         struct ieee80211_local *local = sdata->local;
983         int flushed;
984         int i;
985
986         /* free extra data */
987         ieee80211_free_keys(sdata);
988
989         ieee80211_debugfs_remove_netdev(sdata);
990
991         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
992                 __skb_queue_purge(&sdata->fragments[i].skb_list);
993         sdata->fragment_next = 0;
994
995         if (ieee80211_vif_is_mesh(&sdata->vif))
996                 mesh_rmc_free(sdata);
997
998         flushed = sta_info_flush(local, sdata);
999         WARN_ON(flushed);
1000 }
1001
1002 static void ieee80211_uninit(struct net_device *dev)
1003 {
1004         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1005 }
1006
1007 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1008                                          struct sk_buff *skb)
1009 {
1010         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1011 }
1012
1013 static const struct net_device_ops ieee80211_dataif_ops = {
1014         .ndo_open               = ieee80211_open,
1015         .ndo_stop               = ieee80211_stop,
1016         .ndo_uninit             = ieee80211_uninit,
1017         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1018         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1019         .ndo_change_mtu         = ieee80211_change_mtu,
1020         .ndo_set_mac_address    = ieee80211_change_mac,
1021         .ndo_select_queue       = ieee80211_netdev_select_queue,
1022 };
1023
1024 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1025                                           struct sk_buff *skb)
1026 {
1027         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1028         struct ieee80211_local *local = sdata->local;
1029         struct ieee80211_hdr *hdr;
1030         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1031
1032         if (local->hw.queues < IEEE80211_NUM_ACS)
1033                 return 0;
1034
1035         if (skb->len < 4 ||
1036             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1037                 return 0; /* doesn't matter, frame will be dropped */
1038
1039         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1040
1041         return ieee80211_select_queue_80211(sdata, skb, hdr);
1042 }
1043
1044 static const struct net_device_ops ieee80211_monitorif_ops = {
1045         .ndo_open               = ieee80211_open,
1046         .ndo_stop               = ieee80211_stop,
1047         .ndo_uninit             = ieee80211_uninit,
1048         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1049         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1050         .ndo_change_mtu         = ieee80211_change_mtu,
1051         .ndo_set_mac_address    = eth_mac_addr,
1052         .ndo_select_queue       = ieee80211_monitor_select_queue,
1053 };
1054
1055 static void ieee80211_if_setup(struct net_device *dev)
1056 {
1057         ether_setup(dev);
1058         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1059         dev->netdev_ops = &ieee80211_dataif_ops;
1060         dev->destructor = free_netdev;
1061 }
1062
1063 static void ieee80211_iface_work(struct work_struct *work)
1064 {
1065         struct ieee80211_sub_if_data *sdata =
1066                 container_of(work, struct ieee80211_sub_if_data, work);
1067         struct ieee80211_local *local = sdata->local;
1068         struct sk_buff *skb;
1069         struct sta_info *sta;
1070         struct ieee80211_ra_tid *ra_tid;
1071
1072         if (!ieee80211_sdata_running(sdata))
1073                 return;
1074
1075         if (local->scanning)
1076                 return;
1077
1078         /*
1079          * ieee80211_queue_work() should have picked up most cases,
1080          * here we'll pick the rest.
1081          */
1082         if (WARN(local->suspended,
1083                  "interface work scheduled while going to suspend\n"))
1084                 return;
1085
1086         /* first process frames */
1087         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1088                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1089
1090                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1091                         ra_tid = (void *)&skb->cb;
1092                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1093                                                  ra_tid->tid);
1094                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1095                         ra_tid = (void *)&skb->cb;
1096                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1097                                                 ra_tid->tid);
1098                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1099                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1100                         int len = skb->len;
1101
1102                         mutex_lock(&local->sta_mtx);
1103                         sta = sta_info_get_bss(sdata, mgmt->sa);
1104                         if (sta) {
1105                                 switch (mgmt->u.action.u.addba_req.action_code) {
1106                                 case WLAN_ACTION_ADDBA_REQ:
1107                                         ieee80211_process_addba_request(
1108                                                         local, sta, mgmt, len);
1109                                         break;
1110                                 case WLAN_ACTION_ADDBA_RESP:
1111                                         ieee80211_process_addba_resp(local, sta,
1112                                                                      mgmt, len);
1113                                         break;
1114                                 case WLAN_ACTION_DELBA:
1115                                         ieee80211_process_delba(sdata, sta,
1116                                                                 mgmt, len);
1117                                         break;
1118                                 default:
1119                                         WARN_ON(1);
1120                                         break;
1121                                 }
1122                         }
1123                         mutex_unlock(&local->sta_mtx);
1124                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1125                         struct ieee80211_hdr *hdr = (void *)mgmt;
1126                         /*
1127                          * So the frame isn't mgmt, but frame_control
1128                          * is at the right place anyway, of course, so
1129                          * the if statement is correct.
1130                          *
1131                          * Warn if we have other data frame types here,
1132                          * they must not get here.
1133                          */
1134                         WARN_ON(hdr->frame_control &
1135                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1136                         WARN_ON(!(hdr->seq_ctrl &
1137                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1138                         /*
1139                          * This was a fragment of a frame, received while
1140                          * a block-ack session was active. That cannot be
1141                          * right, so terminate the session.
1142                          */
1143                         mutex_lock(&local->sta_mtx);
1144                         sta = sta_info_get_bss(sdata, mgmt->sa);
1145                         if (sta) {
1146                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1147                                                 IEEE80211_QOS_CTL_TID_MASK;
1148
1149                                 __ieee80211_stop_rx_ba_session(
1150                                         sta, tid, WLAN_BACK_RECIPIENT,
1151                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1152                                         true);
1153                         }
1154                         mutex_unlock(&local->sta_mtx);
1155                 } else switch (sdata->vif.type) {
1156                 case NL80211_IFTYPE_STATION:
1157                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1158                         break;
1159                 case NL80211_IFTYPE_ADHOC:
1160                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1161                         break;
1162                 case NL80211_IFTYPE_MESH_POINT:
1163                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1164                                 break;
1165                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1166                         break;
1167                 default:
1168                         WARN(1, "frame for unexpected interface type");
1169                         break;
1170                 }
1171
1172                 kfree_skb(skb);
1173         }
1174
1175         /* then other type-dependent work */
1176         switch (sdata->vif.type) {
1177         case NL80211_IFTYPE_STATION:
1178                 ieee80211_sta_work(sdata);
1179                 break;
1180         case NL80211_IFTYPE_ADHOC:
1181                 ieee80211_ibss_work(sdata);
1182                 break;
1183         case NL80211_IFTYPE_MESH_POINT:
1184                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1185                         break;
1186                 ieee80211_mesh_work(sdata);
1187                 break;
1188         default:
1189                 break;
1190         }
1191 }
1192
1193 static void ieee80211_recalc_smps_work(struct work_struct *work)
1194 {
1195         struct ieee80211_sub_if_data *sdata =
1196                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1197
1198         ieee80211_recalc_smps(sdata);
1199 }
1200
1201 /*
1202  * Helper function to initialise an interface to a specific type.
1203  */
1204 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1205                                   enum nl80211_iftype type)
1206 {
1207         /* clear type-dependent union */
1208         memset(&sdata->u, 0, sizeof(sdata->u));
1209
1210         /* and set some type-dependent values */
1211         sdata->vif.type = type;
1212         sdata->vif.p2p = false;
1213         sdata->wdev.iftype = type;
1214
1215         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1216         sdata->control_port_no_encrypt = false;
1217
1218         sdata->noack_map = 0;
1219
1220         /* only monitor/p2p-device differ */
1221         if (sdata->dev) {
1222                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1223                 sdata->dev->type = ARPHRD_ETHER;
1224         }
1225
1226         skb_queue_head_init(&sdata->skb_queue);
1227         INIT_WORK(&sdata->work, ieee80211_iface_work);
1228         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1229
1230         switch (type) {
1231         case NL80211_IFTYPE_P2P_GO:
1232                 type = NL80211_IFTYPE_AP;
1233                 sdata->vif.type = type;
1234                 sdata->vif.p2p = true;
1235                 /* fall through */
1236         case NL80211_IFTYPE_AP:
1237                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1238                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1239                 break;
1240         case NL80211_IFTYPE_P2P_CLIENT:
1241                 type = NL80211_IFTYPE_STATION;
1242                 sdata->vif.type = type;
1243                 sdata->vif.p2p = true;
1244                 /* fall through */
1245         case NL80211_IFTYPE_STATION:
1246                 ieee80211_sta_setup_sdata(sdata);
1247                 break;
1248         case NL80211_IFTYPE_ADHOC:
1249                 ieee80211_ibss_setup_sdata(sdata);
1250                 break;
1251         case NL80211_IFTYPE_MESH_POINT:
1252                 if (ieee80211_vif_is_mesh(&sdata->vif))
1253                         ieee80211_mesh_init_sdata(sdata);
1254                 break;
1255         case NL80211_IFTYPE_MONITOR:
1256                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1257                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1258                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1259                                       MONITOR_FLAG_OTHER_BSS;
1260                 break;
1261         case NL80211_IFTYPE_WDS:
1262         case NL80211_IFTYPE_AP_VLAN:
1263         case NL80211_IFTYPE_P2P_DEVICE:
1264                 break;
1265         case NL80211_IFTYPE_UNSPECIFIED:
1266         case NUM_NL80211_IFTYPES:
1267                 BUG();
1268                 break;
1269         }
1270
1271         ieee80211_debugfs_add_netdev(sdata);
1272 }
1273
1274 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1275                                            enum nl80211_iftype type)
1276 {
1277         struct ieee80211_local *local = sdata->local;
1278         int ret, err;
1279         enum nl80211_iftype internal_type = type;
1280         bool p2p = false;
1281
1282         ASSERT_RTNL();
1283
1284         if (!local->ops->change_interface)
1285                 return -EBUSY;
1286
1287         switch (sdata->vif.type) {
1288         case NL80211_IFTYPE_AP:
1289         case NL80211_IFTYPE_STATION:
1290         case NL80211_IFTYPE_ADHOC:
1291                 /*
1292                  * Could maybe also all others here?
1293                  * Just not sure how that interacts
1294                  * with the RX/config path e.g. for
1295                  * mesh.
1296                  */
1297                 break;
1298         default:
1299                 return -EBUSY;
1300         }
1301
1302         switch (type) {
1303         case NL80211_IFTYPE_AP:
1304         case NL80211_IFTYPE_STATION:
1305         case NL80211_IFTYPE_ADHOC:
1306                 /*
1307                  * Could probably support everything
1308                  * but WDS here (WDS do_open can fail
1309                  * under memory pressure, which this
1310                  * code isn't prepared to handle).
1311                  */
1312                 break;
1313         case NL80211_IFTYPE_P2P_CLIENT:
1314                 p2p = true;
1315                 internal_type = NL80211_IFTYPE_STATION;
1316                 break;
1317         case NL80211_IFTYPE_P2P_GO:
1318                 p2p = true;
1319                 internal_type = NL80211_IFTYPE_AP;
1320                 break;
1321         default:
1322                 return -EBUSY;
1323         }
1324
1325         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1326         if (ret)
1327                 return ret;
1328
1329         ieee80211_do_stop(sdata, false);
1330
1331         ieee80211_teardown_sdata(sdata);
1332
1333         ret = drv_change_interface(local, sdata, internal_type, p2p);
1334         if (ret)
1335                 type = sdata->vif.type;
1336
1337         /*
1338          * Ignore return value here, there's not much we can do since
1339          * the driver changed the interface type internally already.
1340          * The warnings will hopefully make driver authors fix it :-)
1341          */
1342         ieee80211_check_queues(sdata);
1343
1344         ieee80211_setup_sdata(sdata, type);
1345
1346         err = ieee80211_do_open(&sdata->wdev, false);
1347         WARN(err, "type change: do_open returned %d", err);
1348
1349         return ret;
1350 }
1351
1352 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1353                              enum nl80211_iftype type)
1354 {
1355         int ret;
1356
1357         ASSERT_RTNL();
1358
1359         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1360                 return 0;
1361
1362         if (ieee80211_sdata_running(sdata)) {
1363                 ret = ieee80211_runtime_change_iftype(sdata, type);
1364                 if (ret)
1365                         return ret;
1366         } else {
1367                 /* Purge and reset type-dependent state. */
1368                 ieee80211_teardown_sdata(sdata);
1369                 ieee80211_setup_sdata(sdata, type);
1370         }
1371
1372         /* reset some values that shouldn't be kept across type changes */
1373         sdata->drop_unencrypted = 0;
1374         if (type == NL80211_IFTYPE_STATION)
1375                 sdata->u.mgd.use_4addr = false;
1376
1377         return 0;
1378 }
1379
1380 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1381                                        u8 *perm_addr, enum nl80211_iftype type)
1382 {
1383         struct ieee80211_sub_if_data *sdata;
1384         u64 mask, start, addr, val, inc;
1385         u8 *m;
1386         u8 tmp_addr[ETH_ALEN];
1387         int i;
1388
1389         /* default ... something at least */
1390         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1391
1392         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1393             local->hw.wiphy->n_addresses <= 1)
1394                 return;
1395
1396         mutex_lock(&local->iflist_mtx);
1397
1398         switch (type) {
1399         case NL80211_IFTYPE_MONITOR:
1400                 /* doesn't matter */
1401                 break;
1402         case NL80211_IFTYPE_WDS:
1403         case NL80211_IFTYPE_AP_VLAN:
1404                 /* match up with an AP interface */
1405                 list_for_each_entry(sdata, &local->interfaces, list) {
1406                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1407                                 continue;
1408                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1409                         break;
1410                 }
1411                 /* keep default if no AP interface present */
1412                 break;
1413         case NL80211_IFTYPE_P2P_CLIENT:
1414         case NL80211_IFTYPE_P2P_GO:
1415                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1416                         list_for_each_entry(sdata, &local->interfaces, list) {
1417                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1418                                         continue;
1419                                 if (!ieee80211_sdata_running(sdata))
1420                                         continue;
1421                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1422                                 goto out_unlock;
1423                         }
1424                 }
1425                 /* otherwise fall through */
1426         default:
1427                 /* assign a new address if possible -- try n_addresses first */
1428                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1429                         bool used = false;
1430
1431                         list_for_each_entry(sdata, &local->interfaces, list) {
1432                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1433                                            sdata->vif.addr, ETH_ALEN) == 0) {
1434                                         used = true;
1435                                         break;
1436                                 }
1437                         }
1438
1439                         if (!used) {
1440                                 memcpy(perm_addr,
1441                                        local->hw.wiphy->addresses[i].addr,
1442                                        ETH_ALEN);
1443                                 break;
1444                         }
1445                 }
1446
1447                 /* try mask if available */
1448                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1449                         break;
1450
1451                 m = local->hw.wiphy->addr_mask;
1452                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1453                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1454                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1455
1456                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1457                         /* not a contiguous mask ... not handled now! */
1458                         pr_info("not contiguous\n");
1459                         break;
1460                 }
1461
1462                 m = local->hw.wiphy->perm_addr;
1463                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1464                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1465                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1466
1467                 inc = 1ULL<<__ffs64(mask);
1468                 val = (start & mask);
1469                 addr = (start & ~mask) | (val & mask);
1470                 do {
1471                         bool used = false;
1472
1473                         tmp_addr[5] = addr >> 0*8;
1474                         tmp_addr[4] = addr >> 1*8;
1475                         tmp_addr[3] = addr >> 2*8;
1476                         tmp_addr[2] = addr >> 3*8;
1477                         tmp_addr[1] = addr >> 4*8;
1478                         tmp_addr[0] = addr >> 5*8;
1479
1480                         val += inc;
1481
1482                         list_for_each_entry(sdata, &local->interfaces, list) {
1483                                 if (memcmp(tmp_addr, sdata->vif.addr,
1484                                                         ETH_ALEN) == 0) {
1485                                         used = true;
1486                                         break;
1487                                 }
1488                         }
1489
1490                         if (!used) {
1491                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1492                                 break;
1493                         }
1494                         addr = (start & ~mask) | (val & mask);
1495                 } while (addr != start);
1496
1497                 break;
1498         }
1499
1500  out_unlock:
1501         mutex_unlock(&local->iflist_mtx);
1502 }
1503
1504 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1505                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1506                      struct vif_params *params)
1507 {
1508         struct net_device *ndev = NULL;
1509         struct ieee80211_sub_if_data *sdata = NULL;
1510         int ret, i;
1511         int txqs = 1;
1512
1513         ASSERT_RTNL();
1514
1515         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1516                 struct wireless_dev *wdev;
1517
1518                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1519                                 GFP_KERNEL);
1520                 if (!sdata)
1521                         return -ENOMEM;
1522                 wdev = &sdata->wdev;
1523
1524                 sdata->dev = NULL;
1525                 strlcpy(sdata->name, name, IFNAMSIZ);
1526                 ieee80211_assign_perm_addr(local, wdev->address, type);
1527                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1528         } else {
1529                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1530                         txqs = IEEE80211_NUM_ACS;
1531
1532                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1533                                         local->hw.vif_data_size,
1534                                         name, ieee80211_if_setup, txqs, 1);
1535                 if (!ndev)
1536                         return -ENOMEM;
1537                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1538
1539                 ndev->needed_headroom = local->tx_headroom +
1540                                         4*6 /* four MAC addresses */
1541                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1542                                         + 6 /* mesh */
1543                                         + 8 /* rfc1042/bridge tunnel */
1544                                         - ETH_HLEN /* ethernet hard_header_len */
1545                                         + IEEE80211_ENCRYPT_HEADROOM;
1546                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1547
1548                 ret = dev_alloc_name(ndev, ndev->name);
1549                 if (ret < 0) {
1550                         free_netdev(ndev);
1551                         return ret;
1552                 }
1553
1554                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1555                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1556                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1557
1558                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1559                 sdata = netdev_priv(ndev);
1560                 ndev->ieee80211_ptr = &sdata->wdev;
1561                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1562                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1563
1564                 sdata->dev = ndev;
1565         }
1566
1567         /* initialise type-independent data */
1568         sdata->wdev.wiphy = local->hw.wiphy;
1569         sdata->local = local;
1570 #ifdef CONFIG_INET
1571         sdata->arp_filter_state = true;
1572 #endif
1573
1574         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1575                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1576
1577         INIT_LIST_HEAD(&sdata->key_list);
1578
1579         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1580                 struct ieee80211_supported_band *sband;
1581                 sband = local->hw.wiphy->bands[i];
1582                 sdata->rc_rateidx_mask[i] =
1583                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1584                 if (sband)
1585                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1586                                sband->ht_cap.mcs.rx_mask,
1587                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1588                 else
1589                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1590                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1591         }
1592
1593         ieee80211_set_default_queues(sdata);
1594
1595         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1596         sdata->user_power_level = local->user_power_level;
1597
1598         /* setup type-dependent data */
1599         ieee80211_setup_sdata(sdata, type);
1600
1601         if (ndev) {
1602                 if (params) {
1603                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1604                         if (type == NL80211_IFTYPE_STATION)
1605                                 sdata->u.mgd.use_4addr = params->use_4addr;
1606                 }
1607
1608                 ndev->features |= local->hw.netdev_features;
1609
1610                 ret = register_netdevice(ndev);
1611                 if (ret) {
1612                         free_netdev(ndev);
1613                         return ret;
1614                 }
1615         }
1616
1617         mutex_lock(&local->iflist_mtx);
1618         list_add_tail_rcu(&sdata->list, &local->interfaces);
1619         mutex_unlock(&local->iflist_mtx);
1620
1621         if (new_wdev)
1622                 *new_wdev = &sdata->wdev;
1623
1624         return 0;
1625 }
1626
1627 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1628 {
1629         ASSERT_RTNL();
1630
1631         mutex_lock(&sdata->local->iflist_mtx);
1632         list_del_rcu(&sdata->list);
1633         mutex_unlock(&sdata->local->iflist_mtx);
1634
1635         synchronize_rcu();
1636
1637         if (sdata->dev) {
1638                 unregister_netdevice(sdata->dev);
1639         } else {
1640                 cfg80211_unregister_wdev(&sdata->wdev);
1641                 kfree(sdata);
1642         }
1643 }
1644
1645 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1646 {
1647         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1648                 return;
1649         ieee80211_do_stop(sdata, true);
1650         ieee80211_teardown_sdata(sdata);
1651 }
1652
1653 /*
1654  * Remove all interfaces, may only be called at hardware unregistration
1655  * time because it doesn't do RCU-safe list removals.
1656  */
1657 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1658 {
1659         struct ieee80211_sub_if_data *sdata, *tmp;
1660         LIST_HEAD(unreg_list);
1661         LIST_HEAD(wdev_list);
1662
1663         ASSERT_RTNL();
1664
1665         mutex_lock(&local->iflist_mtx);
1666         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1667                 list_del(&sdata->list);
1668
1669                 if (sdata->dev)
1670                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1671                 else
1672                         list_add(&sdata->list, &wdev_list);
1673         }
1674         mutex_unlock(&local->iflist_mtx);
1675         unregister_netdevice_many(&unreg_list);
1676         list_del(&unreg_list);
1677
1678         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1679                 list_del(&sdata->list);
1680                 cfg80211_unregister_wdev(&sdata->wdev);
1681                 kfree(sdata);
1682         }
1683 }
1684
1685 static int netdev_notify(struct notifier_block *nb,
1686                          unsigned long state,
1687                          void *ndev)
1688 {
1689         struct net_device *dev = ndev;
1690         struct ieee80211_sub_if_data *sdata;
1691
1692         if (state != NETDEV_CHANGENAME)
1693                 return 0;
1694
1695         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1696                 return 0;
1697
1698         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1699                 return 0;
1700
1701         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1702
1703         memcpy(sdata->name, dev->name, IFNAMSIZ);
1704
1705         ieee80211_debugfs_rename_netdev(sdata);
1706         return 0;
1707 }
1708
1709 static struct notifier_block mac80211_netdev_notifier = {
1710         .notifier_call = netdev_notify,
1711 };
1712
1713 int ieee80211_iface_init(void)
1714 {
1715         return register_netdevice_notifier(&mac80211_netdev_notifier);
1716 }
1717
1718 void ieee80211_iface_exit(void)
1719 {
1720         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1721 }