mac80211: fix idle handling sequence
[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 u32 ieee80211_idle_off(struct ieee80211_local *local)
82 {
83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84                 return 0;
85
86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87         return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 ieee80211_idle_on(struct ieee80211_local *local)
91 {
92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93                 return 0;
94
95         drv_flush(local, false);
96
97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98         return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 void ieee80211_recalc_idle(struct ieee80211_local *local)
102 {
103         bool working = false, scanning, active;
104         unsigned int led_trig_start = 0, led_trig_stop = 0;
105         struct ieee80211_roc_work *roc;
106         u32 change;
107
108         lockdep_assert_held(&local->mtx);
109
110         active = !list_empty(&local->chanctx_list) || local->monitors;
111
112         if (!local->ops->remain_on_channel) {
113                 list_for_each_entry(roc, &local->roc_list, list) {
114                         working = true;
115                         break;
116                 }
117         }
118
119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121
122         if (working || scanning)
123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124         else
125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126
127         if (active)
128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129         else
130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131
132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133
134         if (working || scanning || active)
135                 change = ieee80211_idle_off(local);
136         else
137                 change = ieee80211_idle_on(local);
138         if (change)
139                 ieee80211_hw_config(local, change);
140 }
141
142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
143 {
144         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
145                 return -EINVAL;
146
147         dev->mtu = new_mtu;
148         return 0;
149 }
150
151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
152 {
153         struct ieee80211_sub_if_data *sdata;
154         u64 new, mask, tmp;
155         u8 *m;
156         int ret = 0;
157
158         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
159                 return 0;
160
161         m = addr;
162         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
163                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
164                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
165
166         m = local->hw.wiphy->addr_mask;
167         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171
172         mutex_lock(&local->iflist_mtx);
173         list_for_each_entry(sdata, &local->interfaces, list) {
174                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
175                         continue;
176
177                 m = sdata->vif.addr;
178                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181
182                 if ((new & ~mask) != (tmp & ~mask)) {
183                         ret = -EINVAL;
184                         break;
185                 }
186         }
187         mutex_unlock(&local->iflist_mtx);
188
189         return ret;
190 }
191
192 static int ieee80211_change_mac(struct net_device *dev, void *addr)
193 {
194         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
195         struct sockaddr *sa = addr;
196         int ret;
197
198         if (ieee80211_sdata_running(sdata))
199                 return -EBUSY;
200
201         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
202         if (ret)
203                 return ret;
204
205         ret = eth_mac_addr(dev, sa);
206
207         if (ret == 0)
208                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
209
210         return ret;
211 }
212
213 static inline int identical_mac_addr_allowed(int type1, int type2)
214 {
215         return type1 == NL80211_IFTYPE_MONITOR ||
216                 type2 == NL80211_IFTYPE_MONITOR ||
217                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
218                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
219                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
220                 (type1 == NL80211_IFTYPE_WDS &&
221                         (type2 == NL80211_IFTYPE_WDS ||
222                          type2 == NL80211_IFTYPE_AP)) ||
223                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
224                 (type1 == NL80211_IFTYPE_AP_VLAN &&
225                         (type2 == NL80211_IFTYPE_AP ||
226                          type2 == NL80211_IFTYPE_AP_VLAN));
227 }
228
229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
230                                             enum nl80211_iftype iftype)
231 {
232         struct ieee80211_local *local = sdata->local;
233         struct ieee80211_sub_if_data *nsdata;
234
235         ASSERT_RTNL();
236
237         /* we hold the RTNL here so can safely walk the list */
238         list_for_each_entry(nsdata, &local->interfaces, list) {
239                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
240                         /*
241                          * Allow only a single IBSS interface to be up at any
242                          * time. This is restricted because beacon distribution
243                          * cannot work properly if both are in the same IBSS.
244                          *
245                          * To remove this restriction we'd have to disallow them
246                          * from setting the same SSID on different IBSS interfaces
247                          * belonging to the same hardware. Then, however, we're
248                          * faced with having to adopt two different TSF timers...
249                          */
250                         if (iftype == NL80211_IFTYPE_ADHOC &&
251                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
252                                 return -EBUSY;
253
254                         /*
255                          * The remaining checks are only performed for interfaces
256                          * with the same MAC address.
257                          */
258                         if (!ether_addr_equal(sdata->vif.addr,
259                                               nsdata->vif.addr))
260                                 continue;
261
262                         /*
263                          * check whether it may have the same address
264                          */
265                         if (!identical_mac_addr_allowed(iftype,
266                                                         nsdata->vif.type))
267                                 return -ENOTUNIQ;
268
269                         /*
270                          * can only add VLANs to enabled APs
271                          */
272                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
273                             nsdata->vif.type == NL80211_IFTYPE_AP)
274                                 sdata->bss = &nsdata->u.ap;
275                 }
276         }
277
278         return 0;
279 }
280
281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
282 {
283         int n_queues = sdata->local->hw.queues;
284         int i;
285
286         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
287                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
288                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
289                                          IEEE80211_INVAL_HW_QUEUE))
290                                 return -EINVAL;
291                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
292                                          n_queues))
293                                 return -EINVAL;
294                 }
295         }
296
297         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
298              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
299             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
300                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
301                 return 0;
302         }
303
304         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
305                 return -EINVAL;
306
307         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
308                 return -EINVAL;
309
310         return 0;
311 }
312
313 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
314                                     const int offset)
315 {
316         struct ieee80211_local *local = sdata->local;
317         u32 flags = sdata->u.mntr_flags;
318
319 #define ADJUST(_f, _s)  do {                                    \
320         if (flags & MONITOR_FLAG_##_f)                          \
321                 local->fif_##_s += offset;                      \
322         } while (0)
323
324         ADJUST(FCSFAIL, fcsfail);
325         ADJUST(PLCPFAIL, plcpfail);
326         ADJUST(CONTROL, control);
327         ADJUST(CONTROL, pspoll);
328         ADJUST(OTHER_BSS, other_bss);
329
330 #undef ADJUST
331 }
332
333 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
334 {
335         struct ieee80211_local *local = sdata->local;
336         int i;
337
338         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
339                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
340                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
341                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
342                         sdata->vif.hw_queue[i] = i;
343                 else
344                         sdata->vif.hw_queue[i] = 0;
345         }
346         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
347 }
348
349 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
350 {
351         struct ieee80211_sub_if_data *sdata;
352         int ret;
353
354         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
355                 return 0;
356
357         ASSERT_RTNL();
358
359         if (local->monitor_sdata)
360                 return 0;
361
362         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
363         if (!sdata)
364                 return -ENOMEM;
365
366         /* set up data */
367         sdata->local = local;
368         sdata->vif.type = NL80211_IFTYPE_MONITOR;
369         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
370                  wiphy_name(local->hw.wiphy));
371
372         ieee80211_set_default_queues(sdata);
373
374         ret = drv_add_interface(local, sdata);
375         if (WARN_ON(ret)) {
376                 /* ok .. stupid driver, it asked for this! */
377                 kfree(sdata);
378                 return ret;
379         }
380
381         ret = ieee80211_check_queues(sdata);
382         if (ret) {
383                 kfree(sdata);
384                 return ret;
385         }
386
387         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
388                                         IEEE80211_CHANCTX_EXCLUSIVE);
389         if (ret) {
390                 drv_remove_interface(local, sdata);
391                 kfree(sdata);
392                 return ret;
393         }
394
395         mutex_lock(&local->iflist_mtx);
396         rcu_assign_pointer(local->monitor_sdata, sdata);
397         mutex_unlock(&local->iflist_mtx);
398
399         return 0;
400 }
401
402 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
403 {
404         struct ieee80211_sub_if_data *sdata;
405
406         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
407                 return;
408
409         ASSERT_RTNL();
410
411         mutex_lock(&local->iflist_mtx);
412
413         sdata = rcu_dereference_protected(local->monitor_sdata,
414                                           lockdep_is_held(&local->iflist_mtx));
415         if (!sdata) {
416                 mutex_unlock(&local->iflist_mtx);
417                 return;
418         }
419
420         rcu_assign_pointer(local->monitor_sdata, NULL);
421         mutex_unlock(&local->iflist_mtx);
422
423         synchronize_net();
424
425         ieee80211_vif_release_channel(sdata);
426
427         drv_remove_interface(local, sdata);
428
429         kfree(sdata);
430 }
431
432 /*
433  * NOTE: Be very careful when changing this function, it must NOT return
434  * an error on interface type changes that have been pre-checked, so most
435  * checks should be in ieee80211_check_concurrent_iface.
436  */
437 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
438 {
439         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
440         struct net_device *dev = wdev->netdev;
441         struct ieee80211_local *local = sdata->local;
442         struct sta_info *sta;
443         u32 changed = 0;
444         int res;
445         u32 hw_reconf_flags = 0;
446
447         switch (sdata->vif.type) {
448         case NL80211_IFTYPE_WDS:
449                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
450                         return -ENOLINK;
451                 break;
452         case NL80211_IFTYPE_AP_VLAN: {
453                 struct ieee80211_sub_if_data *master;
454
455                 if (!sdata->bss)
456                         return -ENOLINK;
457
458                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
459
460                 master = container_of(sdata->bss,
461                                       struct ieee80211_sub_if_data, u.ap);
462                 sdata->control_port_protocol =
463                         master->control_port_protocol;
464                 sdata->control_port_no_encrypt =
465                         master->control_port_no_encrypt;
466                 break;
467                 }
468         case NL80211_IFTYPE_AP:
469                 sdata->bss = &sdata->u.ap;
470                 break;
471         case NL80211_IFTYPE_MESH_POINT:
472         case NL80211_IFTYPE_STATION:
473         case NL80211_IFTYPE_MONITOR:
474         case NL80211_IFTYPE_ADHOC:
475         case NL80211_IFTYPE_P2P_DEVICE:
476                 /* no special treatment */
477                 break;
478         case NL80211_IFTYPE_UNSPECIFIED:
479         case NUM_NL80211_IFTYPES:
480         case NL80211_IFTYPE_P2P_CLIENT:
481         case NL80211_IFTYPE_P2P_GO:
482                 /* cannot happen */
483                 WARN_ON(1);
484                 break;
485         }
486
487         if (local->open_count == 0) {
488                 res = drv_start(local);
489                 if (res)
490                         goto err_del_bss;
491                 if (local->ops->napi_poll)
492                         napi_enable(&local->napi);
493                 /* we're brought up, everything changes */
494                 hw_reconf_flags = ~0;
495                 ieee80211_led_radio(local, true);
496                 ieee80211_mod_tpt_led_trig(local,
497                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
498         }
499
500         /*
501          * Copy the hopefully now-present MAC address to
502          * this interface, if it has the special null one.
503          */
504         if (dev && is_zero_ether_addr(dev->dev_addr)) {
505                 memcpy(dev->dev_addr,
506                        local->hw.wiphy->perm_addr,
507                        ETH_ALEN);
508                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
509
510                 if (!is_valid_ether_addr(dev->dev_addr)) {
511                         res = -EADDRNOTAVAIL;
512                         goto err_stop;
513                 }
514         }
515
516         switch (sdata->vif.type) {
517         case NL80211_IFTYPE_AP_VLAN:
518                 /* no need to tell driver, but set carrier and chanctx */
519                 if (rtnl_dereference(sdata->bss->beacon)) {
520                         ieee80211_vif_vlan_copy_chanctx(sdata);
521                         netif_carrier_on(dev);
522                 } else {
523                         netif_carrier_off(dev);
524                 }
525                 break;
526         case NL80211_IFTYPE_MONITOR:
527                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
528                         local->cooked_mntrs++;
529                         break;
530                 }
531
532                 if (local->monitors == 0 && local->open_count == 0) {
533                         res = ieee80211_add_virtual_monitor(local);
534                         if (res)
535                                 goto err_stop;
536                 }
537
538                 /* must be before the call to ieee80211_configure_filter */
539                 local->monitors++;
540                 if (local->monitors == 1) {
541                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
542                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
543                 }
544
545                 ieee80211_adjust_monitor_flags(sdata, 1);
546                 ieee80211_configure_filter(local);
547                 mutex_lock(&local->mtx);
548                 ieee80211_recalc_idle(local);
549                 mutex_unlock(&local->mtx);
550
551                 netif_carrier_on(dev);
552                 break;
553         default:
554                 if (coming_up) {
555                         ieee80211_del_virtual_monitor(local);
556
557                         res = drv_add_interface(local, sdata);
558                         if (res)
559                                 goto err_stop;
560                         res = ieee80211_check_queues(sdata);
561                         if (res)
562                                 goto err_del_interface;
563                 }
564
565                 drv_add_interface_debugfs(local, sdata);
566
567                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
568                         local->fif_pspoll++;
569                         local->fif_probe_req++;
570
571                         ieee80211_configure_filter(local);
572                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
573                         local->fif_probe_req++;
574                 }
575
576                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
577                         changed |= ieee80211_reset_erp_info(sdata);
578                 ieee80211_bss_info_change_notify(sdata, changed);
579
580                 switch (sdata->vif.type) {
581                 case NL80211_IFTYPE_STATION:
582                 case NL80211_IFTYPE_ADHOC:
583                 case NL80211_IFTYPE_AP:
584                 case NL80211_IFTYPE_MESH_POINT:
585                         netif_carrier_off(dev);
586                         break;
587                 case NL80211_IFTYPE_WDS:
588                 case NL80211_IFTYPE_P2P_DEVICE:
589                         break;
590                 default:
591                         netif_carrier_on(dev);
592                 }
593
594                 /*
595                  * set default queue parameters so drivers don't
596                  * need to initialise the hardware if the hardware
597                  * doesn't start up with sane defaults
598                  */
599                 ieee80211_set_wmm_default(sdata, true);
600         }
601
602         set_bit(SDATA_STATE_RUNNING, &sdata->state);
603
604         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
605                 /* Create STA entry for the WDS peer */
606                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
607                                      GFP_KERNEL);
608                 if (!sta) {
609                         res = -ENOMEM;
610                         goto err_del_interface;
611                 }
612
613                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
614                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
615                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
616
617                 res = sta_info_insert(sta);
618                 if (res) {
619                         /* STA has been freed */
620                         goto err_del_interface;
621                 }
622
623                 rate_control_rate_init(sta);
624                 netif_carrier_on(dev);
625         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
626                 rcu_assign_pointer(local->p2p_sdata, sdata);
627         }
628
629         /*
630          * set_multicast_list will be invoked by the networking core
631          * which will check whether any increments here were done in
632          * error and sync them down to the hardware as filter flags.
633          */
634         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
635                 atomic_inc(&local->iff_allmultis);
636
637         if (sdata->flags & IEEE80211_SDATA_PROMISC)
638                 atomic_inc(&local->iff_promiscs);
639
640         if (coming_up)
641                 local->open_count++;
642
643         if (hw_reconf_flags)
644                 ieee80211_hw_config(local, hw_reconf_flags);
645
646         ieee80211_recalc_ps(local, -1);
647
648         if (dev)
649                 netif_tx_start_all_queues(dev);
650
651         return 0;
652  err_del_interface:
653         drv_remove_interface(local, sdata);
654  err_stop:
655         if (!local->open_count)
656                 drv_stop(local);
657  err_del_bss:
658         sdata->bss = NULL;
659         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
660                 list_del(&sdata->u.vlan.list);
661         /* might already be clear but that doesn't matter */
662         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
663         return res;
664 }
665
666 static int ieee80211_open(struct net_device *dev)
667 {
668         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
669         int err;
670
671         /* fail early if user set an invalid address */
672         if (!is_valid_ether_addr(dev->dev_addr))
673                 return -EADDRNOTAVAIL;
674
675         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
676         if (err)
677                 return err;
678
679         return ieee80211_do_open(&sdata->wdev, true);
680 }
681
682 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
683                               bool going_down)
684 {
685         struct ieee80211_local *local = sdata->local;
686         unsigned long flags;
687         struct sk_buff *skb, *tmp;
688         u32 hw_reconf_flags = 0;
689         int i, flushed;
690         struct ps_data *ps;
691
692         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
693
694         if (rcu_access_pointer(local->scan_sdata) == sdata)
695                 ieee80211_scan_cancel(local);
696
697         /*
698          * Stop TX on this interface first.
699          */
700         if (sdata->dev)
701                 netif_tx_stop_all_queues(sdata->dev);
702
703         ieee80211_roc_purge(sdata);
704
705         if (sdata->vif.type == NL80211_IFTYPE_STATION)
706                 ieee80211_mgd_stop(sdata);
707
708         /*
709          * Remove all stations associated with this interface.
710          *
711          * This must be done before calling ops->remove_interface()
712          * because otherwise we can later invoke ops->sta_notify()
713          * whenever the STAs are removed, and that invalidates driver
714          * assumptions about always getting a vif pointer that is valid
715          * (because if we remove a STA after ops->remove_interface()
716          * the driver will have removed the vif info already!)
717          *
718          * This is relevant only in WDS mode, in all other modes we've
719          * already removed all stations when disconnecting or similar,
720          * so warn otherwise.
721          *
722          * We call sta_info_flush_cleanup() later, to combine RCU waits.
723          */
724         flushed = sta_info_flush_defer(sdata);
725         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
726                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
727
728         /*
729          * Don't count this interface for promisc/allmulti while it
730          * is down. dev_mc_unsync() will invoke set_multicast_list
731          * on the master interface which will sync these down to the
732          * hardware as filter flags.
733          */
734         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
735                 atomic_dec(&local->iff_allmultis);
736
737         if (sdata->flags & IEEE80211_SDATA_PROMISC)
738                 atomic_dec(&local->iff_promiscs);
739
740         if (sdata->vif.type == NL80211_IFTYPE_AP) {
741                 local->fif_pspoll--;
742                 local->fif_probe_req--;
743         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
744                 local->fif_probe_req--;
745         }
746
747         if (sdata->dev) {
748                 netif_addr_lock_bh(sdata->dev);
749                 spin_lock_bh(&local->filter_lock);
750                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
751                                  sdata->dev->addr_len);
752                 spin_unlock_bh(&local->filter_lock);
753                 netif_addr_unlock_bh(sdata->dev);
754
755                 ieee80211_configure_filter(local);
756         }
757
758         del_timer_sync(&local->dynamic_ps_timer);
759         cancel_work_sync(&local->dynamic_ps_enable_work);
760
761         cancel_work_sync(&sdata->recalc_smps);
762
763         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
764
765         if (sdata->wdev.cac_started) {
766                 mutex_lock(&local->iflist_mtx);
767                 ieee80211_vif_release_channel(sdata);
768                 mutex_unlock(&local->iflist_mtx);
769                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
770                                    GFP_KERNEL);
771         }
772
773         /* APs need special treatment */
774         if (sdata->vif.type == NL80211_IFTYPE_AP) {
775                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
776
777                 /* down all dependent devices, that is VLANs */
778                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
779                                          u.vlan.list)
780                         dev_close(vlan->dev);
781                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
782         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
783                 /* remove all packets in parent bc_buf pointing to this dev */
784                 ps = &sdata->bss->ps;
785
786                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
787                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
788                         if (skb->dev == sdata->dev) {
789                                 __skb_unlink(skb, &ps->bc_buf);
790                                 local->total_ps_buffered--;
791                                 ieee80211_free_txskb(&local->hw, skb);
792                         }
793                 }
794                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
795         }
796
797         if (going_down)
798                 local->open_count--;
799
800         switch (sdata->vif.type) {
801         case NL80211_IFTYPE_AP_VLAN:
802                 list_del(&sdata->u.vlan.list);
803                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
804                 /* no need to tell driver */
805                 break;
806         case NL80211_IFTYPE_MONITOR:
807                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
808                         local->cooked_mntrs--;
809                         break;
810                 }
811
812                 local->monitors--;
813                 if (local->monitors == 0) {
814                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
815                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
816                         ieee80211_del_virtual_monitor(local);
817                 }
818
819                 ieee80211_adjust_monitor_flags(sdata, -1);
820                 ieee80211_configure_filter(local);
821                 mutex_lock(&local->mtx);
822                 ieee80211_recalc_idle(local);
823                 mutex_unlock(&local->mtx);
824                 break;
825         case NL80211_IFTYPE_P2P_DEVICE:
826                 /* relies on synchronize_rcu() below */
827                 rcu_assign_pointer(local->p2p_sdata, NULL);
828                 /* fall through */
829         default:
830                 cancel_work_sync(&sdata->work);
831                 /*
832                  * When we get here, the interface is marked down.
833                  *
834                  * sta_info_flush_cleanup() requires rcu_barrier()
835                  * first to wait for the station call_rcu() calls
836                  * to complete, here we need at least sychronize_rcu()
837                  * it to wait for the RX path in case it is using the
838                  * interface and enqueuing frames at this very time on
839                  * another CPU.
840                  */
841                 rcu_barrier();
842                 sta_info_flush_cleanup(sdata);
843
844                 skb_queue_purge(&sdata->skb_queue);
845
846                 /*
847                  * Free all remaining keys, there shouldn't be any,
848                  * except maybe group keys in AP more or WDS?
849                  */
850                 ieee80211_free_keys(sdata);
851
852                 drv_remove_interface_debugfs(local, sdata);
853
854                 if (going_down)
855                         drv_remove_interface(local, sdata);
856         }
857
858         sdata->bss = NULL;
859
860         ieee80211_recalc_ps(local, -1);
861
862         if (local->open_count == 0) {
863                 if (local->ops->napi_poll)
864                         napi_disable(&local->napi);
865                 ieee80211_clear_tx_pending(local);
866                 ieee80211_stop_device(local);
867
868                 /* no reconfiguring after stop! */
869                 hw_reconf_flags = 0;
870         }
871
872         /* do after stop to avoid reconfiguring when we stop anyway */
873         if (hw_reconf_flags)
874                 ieee80211_hw_config(local, hw_reconf_flags);
875
876         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
877         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
878                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
879                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
880                         if (info->control.vif == &sdata->vif) {
881                                 __skb_unlink(skb, &local->pending[i]);
882                                 ieee80211_free_txskb(&local->hw, skb);
883                         }
884                 }
885         }
886         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
887
888         if (local->monitors == local->open_count && local->monitors > 0)
889                 ieee80211_add_virtual_monitor(local);
890 }
891
892 static int ieee80211_stop(struct net_device *dev)
893 {
894         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
895
896         ieee80211_do_stop(sdata, true);
897
898         return 0;
899 }
900
901 static void ieee80211_set_multicast_list(struct net_device *dev)
902 {
903         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
904         struct ieee80211_local *local = sdata->local;
905         int allmulti, promisc, sdata_allmulti, sdata_promisc;
906
907         allmulti = !!(dev->flags & IFF_ALLMULTI);
908         promisc = !!(dev->flags & IFF_PROMISC);
909         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
910         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
911
912         if (allmulti != sdata_allmulti) {
913                 if (dev->flags & IFF_ALLMULTI)
914                         atomic_inc(&local->iff_allmultis);
915                 else
916                         atomic_dec(&local->iff_allmultis);
917                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
918         }
919
920         if (promisc != sdata_promisc) {
921                 if (dev->flags & IFF_PROMISC)
922                         atomic_inc(&local->iff_promiscs);
923                 else
924                         atomic_dec(&local->iff_promiscs);
925                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
926         }
927         spin_lock_bh(&local->filter_lock);
928         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
929         spin_unlock_bh(&local->filter_lock);
930         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
931 }
932
933 /*
934  * Called when the netdev is removed or, by the code below, before
935  * the interface type changes.
936  */
937 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
938 {
939         int flushed;
940         int i;
941
942         /* free extra data */
943         ieee80211_free_keys(sdata);
944
945         ieee80211_debugfs_remove_netdev(sdata);
946
947         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
948                 __skb_queue_purge(&sdata->fragments[i].skb_list);
949         sdata->fragment_next = 0;
950
951         if (ieee80211_vif_is_mesh(&sdata->vif))
952                 mesh_rmc_free(sdata);
953
954         flushed = sta_info_flush(sdata);
955         WARN_ON(flushed);
956 }
957
958 static void ieee80211_uninit(struct net_device *dev)
959 {
960         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
961 }
962
963 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
964                                          struct sk_buff *skb)
965 {
966         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
967 }
968
969 static const struct net_device_ops ieee80211_dataif_ops = {
970         .ndo_open               = ieee80211_open,
971         .ndo_stop               = ieee80211_stop,
972         .ndo_uninit             = ieee80211_uninit,
973         .ndo_start_xmit         = ieee80211_subif_start_xmit,
974         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
975         .ndo_change_mtu         = ieee80211_change_mtu,
976         .ndo_set_mac_address    = ieee80211_change_mac,
977         .ndo_select_queue       = ieee80211_netdev_select_queue,
978 };
979
980 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
981                                           struct sk_buff *skb)
982 {
983         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
984         struct ieee80211_local *local = sdata->local;
985         struct ieee80211_hdr *hdr;
986         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
987
988         if (local->hw.queues < IEEE80211_NUM_ACS)
989                 return 0;
990
991         if (skb->len < 4 ||
992             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
993                 return 0; /* doesn't matter, frame will be dropped */
994
995         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
996
997         return ieee80211_select_queue_80211(sdata, skb, hdr);
998 }
999
1000 static const struct net_device_ops ieee80211_monitorif_ops = {
1001         .ndo_open               = ieee80211_open,
1002         .ndo_stop               = ieee80211_stop,
1003         .ndo_uninit             = ieee80211_uninit,
1004         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1005         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1006         .ndo_change_mtu         = ieee80211_change_mtu,
1007         .ndo_set_mac_address    = eth_mac_addr,
1008         .ndo_select_queue       = ieee80211_monitor_select_queue,
1009 };
1010
1011 static void ieee80211_if_setup(struct net_device *dev)
1012 {
1013         ether_setup(dev);
1014         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1015         dev->netdev_ops = &ieee80211_dataif_ops;
1016         dev->destructor = free_netdev;
1017 }
1018
1019 static void ieee80211_iface_work(struct work_struct *work)
1020 {
1021         struct ieee80211_sub_if_data *sdata =
1022                 container_of(work, struct ieee80211_sub_if_data, work);
1023         struct ieee80211_local *local = sdata->local;
1024         struct sk_buff *skb;
1025         struct sta_info *sta;
1026         struct ieee80211_ra_tid *ra_tid;
1027
1028         if (!ieee80211_sdata_running(sdata))
1029                 return;
1030
1031         if (local->scanning)
1032                 return;
1033
1034         /*
1035          * ieee80211_queue_work() should have picked up most cases,
1036          * here we'll pick the rest.
1037          */
1038         if (WARN(local->suspended,
1039                  "interface work scheduled while going to suspend\n"))
1040                 return;
1041
1042         /* first process frames */
1043         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1044                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1045
1046                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1047                         ra_tid = (void *)&skb->cb;
1048                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1049                                                  ra_tid->tid);
1050                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1051                         ra_tid = (void *)&skb->cb;
1052                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1053                                                 ra_tid->tid);
1054                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1055                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1056                         int len = skb->len;
1057
1058                         mutex_lock(&local->sta_mtx);
1059                         sta = sta_info_get_bss(sdata, mgmt->sa);
1060                         if (sta) {
1061                                 switch (mgmt->u.action.u.addba_req.action_code) {
1062                                 case WLAN_ACTION_ADDBA_REQ:
1063                                         ieee80211_process_addba_request(
1064                                                         local, sta, mgmt, len);
1065                                         break;
1066                                 case WLAN_ACTION_ADDBA_RESP:
1067                                         ieee80211_process_addba_resp(local, sta,
1068                                                                      mgmt, len);
1069                                         break;
1070                                 case WLAN_ACTION_DELBA:
1071                                         ieee80211_process_delba(sdata, sta,
1072                                                                 mgmt, len);
1073                                         break;
1074                                 default:
1075                                         WARN_ON(1);
1076                                         break;
1077                                 }
1078                         }
1079                         mutex_unlock(&local->sta_mtx);
1080                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1081                         struct ieee80211_hdr *hdr = (void *)mgmt;
1082                         /*
1083                          * So the frame isn't mgmt, but frame_control
1084                          * is at the right place anyway, of course, so
1085                          * the if statement is correct.
1086                          *
1087                          * Warn if we have other data frame types here,
1088                          * they must not get here.
1089                          */
1090                         WARN_ON(hdr->frame_control &
1091                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1092                         WARN_ON(!(hdr->seq_ctrl &
1093                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1094                         /*
1095                          * This was a fragment of a frame, received while
1096                          * a block-ack session was active. That cannot be
1097                          * right, so terminate the session.
1098                          */
1099                         mutex_lock(&local->sta_mtx);
1100                         sta = sta_info_get_bss(sdata, mgmt->sa);
1101                         if (sta) {
1102                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1103                                                 IEEE80211_QOS_CTL_TID_MASK;
1104
1105                                 __ieee80211_stop_rx_ba_session(
1106                                         sta, tid, WLAN_BACK_RECIPIENT,
1107                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1108                                         true);
1109                         }
1110                         mutex_unlock(&local->sta_mtx);
1111                 } else switch (sdata->vif.type) {
1112                 case NL80211_IFTYPE_STATION:
1113                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1114                         break;
1115                 case NL80211_IFTYPE_ADHOC:
1116                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1117                         break;
1118                 case NL80211_IFTYPE_MESH_POINT:
1119                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1120                                 break;
1121                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1122                         break;
1123                 default:
1124                         WARN(1, "frame for unexpected interface type");
1125                         break;
1126                 }
1127
1128                 kfree_skb(skb);
1129         }
1130
1131         /* then other type-dependent work */
1132         switch (sdata->vif.type) {
1133         case NL80211_IFTYPE_STATION:
1134                 ieee80211_sta_work(sdata);
1135                 break;
1136         case NL80211_IFTYPE_ADHOC:
1137                 ieee80211_ibss_work(sdata);
1138                 break;
1139         case NL80211_IFTYPE_MESH_POINT:
1140                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1141                         break;
1142                 ieee80211_mesh_work(sdata);
1143                 break;
1144         default:
1145                 break;
1146         }
1147 }
1148
1149 static void ieee80211_recalc_smps_work(struct work_struct *work)
1150 {
1151         struct ieee80211_sub_if_data *sdata =
1152                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1153
1154         ieee80211_recalc_smps(sdata);
1155 }
1156
1157 /*
1158  * Helper function to initialise an interface to a specific type.
1159  */
1160 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1161                                   enum nl80211_iftype type)
1162 {
1163         /* clear type-dependent union */
1164         memset(&sdata->u, 0, sizeof(sdata->u));
1165
1166         /* and set some type-dependent values */
1167         sdata->vif.type = type;
1168         sdata->vif.p2p = false;
1169         sdata->wdev.iftype = type;
1170
1171         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1172         sdata->control_port_no_encrypt = false;
1173
1174         sdata->noack_map = 0;
1175
1176         /* only monitor/p2p-device differ */
1177         if (sdata->dev) {
1178                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1179                 sdata->dev->type = ARPHRD_ETHER;
1180         }
1181
1182         skb_queue_head_init(&sdata->skb_queue);
1183         INIT_WORK(&sdata->work, ieee80211_iface_work);
1184         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1185
1186         switch (type) {
1187         case NL80211_IFTYPE_P2P_GO:
1188                 type = NL80211_IFTYPE_AP;
1189                 sdata->vif.type = type;
1190                 sdata->vif.p2p = true;
1191                 /* fall through */
1192         case NL80211_IFTYPE_AP:
1193                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1194                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1195                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1196                 break;
1197         case NL80211_IFTYPE_P2P_CLIENT:
1198                 type = NL80211_IFTYPE_STATION;
1199                 sdata->vif.type = type;
1200                 sdata->vif.p2p = true;
1201                 /* fall through */
1202         case NL80211_IFTYPE_STATION:
1203                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1204                 ieee80211_sta_setup_sdata(sdata);
1205                 break;
1206         case NL80211_IFTYPE_ADHOC:
1207                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1208                 ieee80211_ibss_setup_sdata(sdata);
1209                 break;
1210         case NL80211_IFTYPE_MESH_POINT:
1211                 if (ieee80211_vif_is_mesh(&sdata->vif))
1212                         ieee80211_mesh_init_sdata(sdata);
1213                 break;
1214         case NL80211_IFTYPE_MONITOR:
1215                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1216                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1217                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1218                                       MONITOR_FLAG_OTHER_BSS;
1219                 break;
1220         case NL80211_IFTYPE_WDS:
1221                 sdata->vif.bss_conf.bssid = NULL;
1222                 break;
1223         case NL80211_IFTYPE_AP_VLAN:
1224                 break;
1225         case NL80211_IFTYPE_P2P_DEVICE:
1226                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1227                 break;
1228         case NL80211_IFTYPE_UNSPECIFIED:
1229         case NUM_NL80211_IFTYPES:
1230                 BUG();
1231                 break;
1232         }
1233
1234         ieee80211_debugfs_add_netdev(sdata);
1235 }
1236
1237 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1238                                            enum nl80211_iftype type)
1239 {
1240         struct ieee80211_local *local = sdata->local;
1241         int ret, err;
1242         enum nl80211_iftype internal_type = type;
1243         bool p2p = false;
1244
1245         ASSERT_RTNL();
1246
1247         if (!local->ops->change_interface)
1248                 return -EBUSY;
1249
1250         switch (sdata->vif.type) {
1251         case NL80211_IFTYPE_AP:
1252         case NL80211_IFTYPE_STATION:
1253         case NL80211_IFTYPE_ADHOC:
1254                 /*
1255                  * Could maybe also all others here?
1256                  * Just not sure how that interacts
1257                  * with the RX/config path e.g. for
1258                  * mesh.
1259                  */
1260                 break;
1261         default:
1262                 return -EBUSY;
1263         }
1264
1265         switch (type) {
1266         case NL80211_IFTYPE_AP:
1267         case NL80211_IFTYPE_STATION:
1268         case NL80211_IFTYPE_ADHOC:
1269                 /*
1270                  * Could probably support everything
1271                  * but WDS here (WDS do_open can fail
1272                  * under memory pressure, which this
1273                  * code isn't prepared to handle).
1274                  */
1275                 break;
1276         case NL80211_IFTYPE_P2P_CLIENT:
1277                 p2p = true;
1278                 internal_type = NL80211_IFTYPE_STATION;
1279                 break;
1280         case NL80211_IFTYPE_P2P_GO:
1281                 p2p = true;
1282                 internal_type = NL80211_IFTYPE_AP;
1283                 break;
1284         default:
1285                 return -EBUSY;
1286         }
1287
1288         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1289         if (ret)
1290                 return ret;
1291
1292         ieee80211_do_stop(sdata, false);
1293
1294         ieee80211_teardown_sdata(sdata);
1295
1296         ret = drv_change_interface(local, sdata, internal_type, p2p);
1297         if (ret)
1298                 type = sdata->vif.type;
1299
1300         /*
1301          * Ignore return value here, there's not much we can do since
1302          * the driver changed the interface type internally already.
1303          * The warnings will hopefully make driver authors fix it :-)
1304          */
1305         ieee80211_check_queues(sdata);
1306
1307         ieee80211_setup_sdata(sdata, type);
1308
1309         err = ieee80211_do_open(&sdata->wdev, false);
1310         WARN(err, "type change: do_open returned %d", err);
1311
1312         return ret;
1313 }
1314
1315 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1316                              enum nl80211_iftype type)
1317 {
1318         int ret;
1319
1320         ASSERT_RTNL();
1321
1322         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1323                 return 0;
1324
1325         if (ieee80211_sdata_running(sdata)) {
1326                 ret = ieee80211_runtime_change_iftype(sdata, type);
1327                 if (ret)
1328                         return ret;
1329         } else {
1330                 /* Purge and reset type-dependent state. */
1331                 ieee80211_teardown_sdata(sdata);
1332                 ieee80211_setup_sdata(sdata, type);
1333         }
1334
1335         /* reset some values that shouldn't be kept across type changes */
1336         sdata->drop_unencrypted = 0;
1337         if (type == NL80211_IFTYPE_STATION)
1338                 sdata->u.mgd.use_4addr = false;
1339
1340         return 0;
1341 }
1342
1343 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1344                                        u8 *perm_addr, enum nl80211_iftype type)
1345 {
1346         struct ieee80211_sub_if_data *sdata;
1347         u64 mask, start, addr, val, inc;
1348         u8 *m;
1349         u8 tmp_addr[ETH_ALEN];
1350         int i;
1351
1352         /* default ... something at least */
1353         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1354
1355         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1356             local->hw.wiphy->n_addresses <= 1)
1357                 return;
1358
1359         mutex_lock(&local->iflist_mtx);
1360
1361         switch (type) {
1362         case NL80211_IFTYPE_MONITOR:
1363                 /* doesn't matter */
1364                 break;
1365         case NL80211_IFTYPE_WDS:
1366         case NL80211_IFTYPE_AP_VLAN:
1367                 /* match up with an AP interface */
1368                 list_for_each_entry(sdata, &local->interfaces, list) {
1369                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1370                                 continue;
1371                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1372                         break;
1373                 }
1374                 /* keep default if no AP interface present */
1375                 break;
1376         case NL80211_IFTYPE_P2P_CLIENT:
1377         case NL80211_IFTYPE_P2P_GO:
1378                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1379                         list_for_each_entry(sdata, &local->interfaces, list) {
1380                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1381                                         continue;
1382                                 if (!ieee80211_sdata_running(sdata))
1383                                         continue;
1384                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1385                                 goto out_unlock;
1386                         }
1387                 }
1388                 /* otherwise fall through */
1389         default:
1390                 /* assign a new address if possible -- try n_addresses first */
1391                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1392                         bool used = false;
1393
1394                         list_for_each_entry(sdata, &local->interfaces, list) {
1395                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1396                                            sdata->vif.addr, ETH_ALEN) == 0) {
1397                                         used = true;
1398                                         break;
1399                                 }
1400                         }
1401
1402                         if (!used) {
1403                                 memcpy(perm_addr,
1404                                        local->hw.wiphy->addresses[i].addr,
1405                                        ETH_ALEN);
1406                                 break;
1407                         }
1408                 }
1409
1410                 /* try mask if available */
1411                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1412                         break;
1413
1414                 m = local->hw.wiphy->addr_mask;
1415                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1416                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1417                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1418
1419                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1420                         /* not a contiguous mask ... not handled now! */
1421                         pr_info("not contiguous\n");
1422                         break;
1423                 }
1424
1425                 m = local->hw.wiphy->perm_addr;
1426                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1427                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1428                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1429
1430                 inc = 1ULL<<__ffs64(mask);
1431                 val = (start & mask);
1432                 addr = (start & ~mask) | (val & mask);
1433                 do {
1434                         bool used = false;
1435
1436                         tmp_addr[5] = addr >> 0*8;
1437                         tmp_addr[4] = addr >> 1*8;
1438                         tmp_addr[3] = addr >> 2*8;
1439                         tmp_addr[2] = addr >> 3*8;
1440                         tmp_addr[1] = addr >> 4*8;
1441                         tmp_addr[0] = addr >> 5*8;
1442
1443                         val += inc;
1444
1445                         list_for_each_entry(sdata, &local->interfaces, list) {
1446                                 if (memcmp(tmp_addr, sdata->vif.addr,
1447                                                         ETH_ALEN) == 0) {
1448                                         used = true;
1449                                         break;
1450                                 }
1451                         }
1452
1453                         if (!used) {
1454                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1455                                 break;
1456                         }
1457                         addr = (start & ~mask) | (val & mask);
1458                 } while (addr != start);
1459
1460                 break;
1461         }
1462
1463  out_unlock:
1464         mutex_unlock(&local->iflist_mtx);
1465 }
1466
1467 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1468 {
1469         struct ieee80211_sub_if_data *sdata;
1470
1471         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1472
1473         ieee80211_cleanup_sdata_stas(sdata);
1474 }
1475
1476 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1477                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1478                      struct vif_params *params)
1479 {
1480         struct net_device *ndev = NULL;
1481         struct ieee80211_sub_if_data *sdata = NULL;
1482         int ret, i;
1483         int txqs = 1;
1484
1485         ASSERT_RTNL();
1486
1487         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1488                 struct wireless_dev *wdev;
1489
1490                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1491                                 GFP_KERNEL);
1492                 if (!sdata)
1493                         return -ENOMEM;
1494                 wdev = &sdata->wdev;
1495
1496                 sdata->dev = NULL;
1497                 strlcpy(sdata->name, name, IFNAMSIZ);
1498                 ieee80211_assign_perm_addr(local, wdev->address, type);
1499                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1500         } else {
1501                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1502                         txqs = IEEE80211_NUM_ACS;
1503
1504                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1505                                         local->hw.vif_data_size,
1506                                         name, ieee80211_if_setup, txqs, 1);
1507                 if (!ndev)
1508                         return -ENOMEM;
1509                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1510
1511                 ndev->needed_headroom = local->tx_headroom +
1512                                         4*6 /* four MAC addresses */
1513                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1514                                         + 6 /* mesh */
1515                                         + 8 /* rfc1042/bridge tunnel */
1516                                         - ETH_HLEN /* ethernet hard_header_len */
1517                                         + IEEE80211_ENCRYPT_HEADROOM;
1518                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1519
1520                 ret = dev_alloc_name(ndev, ndev->name);
1521                 if (ret < 0) {
1522                         free_netdev(ndev);
1523                         return ret;
1524                 }
1525
1526                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1527                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1528                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1529
1530                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1531                 sdata = netdev_priv(ndev);
1532                 ndev->ieee80211_ptr = &sdata->wdev;
1533                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1534                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1535
1536                 sdata->dev = ndev;
1537         }
1538
1539         /* initialise type-independent data */
1540         sdata->wdev.wiphy = local->hw.wiphy;
1541         sdata->local = local;
1542
1543         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1544                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1545
1546         INIT_LIST_HEAD(&sdata->key_list);
1547
1548         spin_lock_init(&sdata->cleanup_stations_lock);
1549         INIT_LIST_HEAD(&sdata->cleanup_stations);
1550         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1551         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1552                           ieee80211_dfs_cac_timer_work);
1553
1554         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1555                 struct ieee80211_supported_band *sband;
1556                 sband = local->hw.wiphy->bands[i];
1557                 sdata->rc_rateidx_mask[i] =
1558                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1559                 if (sband)
1560                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1561                                sband->ht_cap.mcs.rx_mask,
1562                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1563                 else
1564                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1565                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1566         }
1567
1568         ieee80211_set_default_queues(sdata);
1569
1570         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1571         sdata->user_power_level = local->user_power_level;
1572
1573         /* setup type-dependent data */
1574         ieee80211_setup_sdata(sdata, type);
1575
1576         if (ndev) {
1577                 if (params) {
1578                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1579                         if (type == NL80211_IFTYPE_STATION)
1580                                 sdata->u.mgd.use_4addr = params->use_4addr;
1581                 }
1582
1583                 ndev->features |= local->hw.netdev_features;
1584
1585                 ret = register_netdevice(ndev);
1586                 if (ret) {
1587                         free_netdev(ndev);
1588                         return ret;
1589                 }
1590         }
1591
1592         mutex_lock(&local->iflist_mtx);
1593         list_add_tail_rcu(&sdata->list, &local->interfaces);
1594         mutex_unlock(&local->iflist_mtx);
1595
1596         if (new_wdev)
1597                 *new_wdev = &sdata->wdev;
1598
1599         return 0;
1600 }
1601
1602 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1603 {
1604         ASSERT_RTNL();
1605
1606         mutex_lock(&sdata->local->iflist_mtx);
1607         list_del_rcu(&sdata->list);
1608         mutex_unlock(&sdata->local->iflist_mtx);
1609
1610         synchronize_rcu();
1611
1612         if (sdata->dev) {
1613                 unregister_netdevice(sdata->dev);
1614         } else {
1615                 cfg80211_unregister_wdev(&sdata->wdev);
1616                 kfree(sdata);
1617         }
1618 }
1619
1620 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1621 {
1622         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1623                 return;
1624         ieee80211_do_stop(sdata, true);
1625         ieee80211_teardown_sdata(sdata);
1626 }
1627
1628 /*
1629  * Remove all interfaces, may only be called at hardware unregistration
1630  * time because it doesn't do RCU-safe list removals.
1631  */
1632 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1633 {
1634         struct ieee80211_sub_if_data *sdata, *tmp;
1635         LIST_HEAD(unreg_list);
1636         LIST_HEAD(wdev_list);
1637
1638         ASSERT_RTNL();
1639
1640         mutex_lock(&local->iflist_mtx);
1641         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1642                 list_del(&sdata->list);
1643
1644                 if (sdata->dev)
1645                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1646                 else
1647                         list_add(&sdata->list, &wdev_list);
1648         }
1649         mutex_unlock(&local->iflist_mtx);
1650         unregister_netdevice_many(&unreg_list);
1651         list_del(&unreg_list);
1652
1653         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1654                 list_del(&sdata->list);
1655                 cfg80211_unregister_wdev(&sdata->wdev);
1656                 kfree(sdata);
1657         }
1658 }
1659
1660 static int netdev_notify(struct notifier_block *nb,
1661                          unsigned long state,
1662                          void *ndev)
1663 {
1664         struct net_device *dev = ndev;
1665         struct ieee80211_sub_if_data *sdata;
1666
1667         if (state != NETDEV_CHANGENAME)
1668                 return 0;
1669
1670         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1671                 return 0;
1672
1673         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1674                 return 0;
1675
1676         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1677
1678         memcpy(sdata->name, dev->name, IFNAMSIZ);
1679
1680         ieee80211_debugfs_rename_netdev(sdata);
1681         return 0;
1682 }
1683
1684 static struct notifier_block mac80211_netdev_notifier = {
1685         .notifier_call = netdev_notify,
1686 };
1687
1688 int ieee80211_iface_init(void)
1689 {
1690         return register_netdevice_notifier(&mac80211_netdev_notifier);
1691 }
1692
1693 void ieee80211_iface_exit(void)
1694 {
1695         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1696 }