forked from microsoft/WSL2-Linux-Kernel
-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathiface.c
1592 lines (1328 loc) · 40.4 KB
/
iface.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Interface handling (except master interface)
*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "debugfs_netdev.h"
#include "mesh.h"
#include "led.h"
#include "driver-ops.h"
#include "wme.h"
#include "rate.h"
/**
* DOC: Interface list locking
*
* The interface list in each struct ieee80211_local is protected
* three-fold:
*
* (1) modifications may only be done under the RTNL
* (2) modifications and readers are protected against each other by
* the iflist_mtx.
* (3) modifications are done in an RCU manner so atomic readers
* can traverse the list in RCU-safe blocks.
*
* As a consequence, reads (traversals) of the list can be protected
* by either the RTNL, the iflist_mtx or RCU.
*/
static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
int meshhdrlen;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
/* FIX: what would be proper limits for MTU?
* This interface uses 802.3 frames. */
if (new_mtu < 256 ||
new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
return -EINVAL;
}
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
dev->mtu = new_mtu;
return 0;
}
static int ieee80211_change_mac(struct net_device *dev, void *addr)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct sockaddr *sa = addr;
int ret;
if (ieee80211_sdata_running(sdata))
return -EBUSY;
ret = eth_mac_addr(dev, sa);
if (ret == 0)
memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
return ret;
}
static inline int identical_mac_addr_allowed(int type1, int type2)
{
return type1 == NL80211_IFTYPE_MONITOR ||
type2 == NL80211_IFTYPE_MONITOR ||
(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
(type1 == NL80211_IFTYPE_WDS &&
(type2 == NL80211_IFTYPE_WDS ||
type2 == NL80211_IFTYPE_AP)) ||
(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
(type1 == NL80211_IFTYPE_AP_VLAN &&
(type2 == NL80211_IFTYPE_AP ||
type2 == NL80211_IFTYPE_AP_VLAN));
}
static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype iftype)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *nsdata;
struct net_device *dev = sdata->dev;
ASSERT_RTNL();
/* we hold the RTNL here so can safely walk the list */
list_for_each_entry(nsdata, &local->interfaces, list) {
struct net_device *ndev = nsdata->dev;
if (ndev != dev && ieee80211_sdata_running(nsdata)) {
/*
* Allow only a single IBSS interface to be up at any
* time. This is restricted because beacon distribution
* cannot work properly if both are in the same IBSS.
*
* To remove this restriction we'd have to disallow them
* from setting the same SSID on different IBSS interfaces
* belonging to the same hardware. Then, however, we're
* faced with having to adopt two different TSF timers...
*/
if (iftype == NL80211_IFTYPE_ADHOC &&
nsdata->vif.type == NL80211_IFTYPE_ADHOC)
return -EBUSY;
/*
* The remaining checks are only performed for interfaces
* with the same MAC address.
*/
if (!ether_addr_equal(dev->dev_addr, ndev->dev_addr))
continue;
/*
* check whether it may have the same address
*/
if (!identical_mac_addr_allowed(iftype,
nsdata->vif.type))
return -ENOTUNIQ;
/*
* can only add VLANs to enabled APs
*/
if (iftype == NL80211_IFTYPE_AP_VLAN &&
nsdata->vif.type == NL80211_IFTYPE_AP)
sdata->bss = &nsdata->u.ap;
}
}
return 0;
}
static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
{
int n_queues = sdata->local->hw.queues;
int i;
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
IEEE80211_INVAL_HW_QUEUE))
return -EINVAL;
if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
n_queues))
return -EINVAL;
}
if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
!(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
return 0;
}
if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
return -EINVAL;
if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
return -EINVAL;
return 0;
}
void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
const int offset)
{
struct ieee80211_local *local = sdata->local;
u32 flags = sdata->u.mntr_flags;
#define ADJUST(_f, _s) do { \
if (flags & MONITOR_FLAG_##_f) \
local->fif_##_s += offset; \
} while (0)
ADJUST(FCSFAIL, fcsfail);
ADJUST(PLCPFAIL, plcpfail);
ADJUST(CONTROL, control);
ADJUST(CONTROL, pspoll);
ADJUST(OTHER_BSS, other_bss);
#undef ADJUST
}
static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
int i;
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
else if (local->hw.queues >= IEEE80211_NUM_ACS)
sdata->vif.hw_queue[i] = i;
else
sdata->vif.hw_queue[i] = 0;
}
sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
}
static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
int ret;
if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
return 0;
if (local->monitor_sdata)
return 0;
sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
if (!sdata)
return -ENOMEM;
/* set up data */
sdata->local = local;
sdata->vif.type = NL80211_IFTYPE_MONITOR;
snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
wiphy_name(local->hw.wiphy));
ieee80211_set_default_queues(sdata);
ret = drv_add_interface(local, sdata);
if (WARN_ON(ret)) {
/* ok .. stupid driver, it asked for this! */
kfree(sdata);
return ret;
}
ret = ieee80211_check_queues(sdata);
if (ret) {
kfree(sdata);
return ret;
}
rcu_assign_pointer(local->monitor_sdata, sdata);
return 0;
}
static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
return;
sdata = rtnl_dereference(local->monitor_sdata);
if (!sdata)
return;
rcu_assign_pointer(local->monitor_sdata, NULL);
synchronize_net();
drv_remove_interface(local, sdata);
kfree(sdata);
}
/*
* NOTE: Be very careful when changing this function, it must NOT return
* an error on interface type changes that have been pre-checked, so most
* checks should be in ieee80211_check_concurrent_iface.
*/
static int ieee80211_do_open(struct net_device *dev, bool coming_up)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
u32 changed = 0;
int res;
u32 hw_reconf_flags = 0;
switch (sdata->vif.type) {
case NL80211_IFTYPE_WDS:
if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
return -ENOLINK;
break;
case NL80211_IFTYPE_AP_VLAN: {
struct ieee80211_sub_if_data *master;
if (!sdata->bss)
return -ENOLINK;
list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
master = container_of(sdata->bss,
struct ieee80211_sub_if_data, u.ap);
sdata->control_port_protocol =
master->control_port_protocol;
sdata->control_port_no_encrypt =
master->control_port_no_encrypt;
break;
}
case NL80211_IFTYPE_AP:
sdata->bss = &sdata->u.ap;
break;
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_ADHOC:
/* no special treatment */
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
/* cannot happen */
WARN_ON(1);
break;
}
if (local->open_count == 0) {
res = drv_start(local);
if (res)
goto err_del_bss;
if (local->ops->napi_poll)
napi_enable(&local->napi);
/* we're brought up, everything changes */
hw_reconf_flags = ~0;
ieee80211_led_radio(local, true);
ieee80211_mod_tpt_led_trig(local,
IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
}
/*
* Copy the hopefully now-present MAC address to
* this interface, if it has the special null one.
*/
if (is_zero_ether_addr(dev->dev_addr)) {
memcpy(dev->dev_addr,
local->hw.wiphy->perm_addr,
ETH_ALEN);
memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
if (!is_valid_ether_addr(dev->dev_addr)) {
res = -EADDRNOTAVAIL;
goto err_stop;
}
}
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
/* no need to tell driver, but set carrier */
if (rtnl_dereference(sdata->bss->beacon))
netif_carrier_on(dev);
else
netif_carrier_off(dev);
break;
case NL80211_IFTYPE_MONITOR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs++;
break;
}
if (local->monitors == 0 && local->open_count == 0) {
res = ieee80211_add_virtual_monitor(local);
if (res)
goto err_stop;
}
/* must be before the call to ieee80211_configure_filter */
local->monitors++;
if (local->monitors == 1) {
local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
}
ieee80211_adjust_monitor_flags(sdata, 1);
ieee80211_configure_filter(local);
netif_carrier_on(dev);
break;
default:
if (coming_up) {
ieee80211_del_virtual_monitor(local);
res = drv_add_interface(local, sdata);
if (res)
goto err_stop;
res = ieee80211_check_queues(sdata);
if (res)
goto err_del_interface;
}
if (sdata->vif.type == NL80211_IFTYPE_AP) {
local->fif_pspoll++;
local->fif_probe_req++;
ieee80211_configure_filter(local);
} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
local->fif_probe_req++;
}
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_bss_info_change_notify(sdata, changed);
if (sdata->vif.type == NL80211_IFTYPE_STATION ||
sdata->vif.type == NL80211_IFTYPE_ADHOC ||
sdata->vif.type == NL80211_IFTYPE_AP)
netif_carrier_off(dev);
else
netif_carrier_on(dev);
/*
* set default queue parameters so drivers don't
* need to initialise the hardware if the hardware
* doesn't start up with sane defaults
*/
ieee80211_set_wmm_default(sdata, true);
}
set_bit(SDATA_STATE_RUNNING, &sdata->state);
if (sdata->vif.type == NL80211_IFTYPE_WDS) {
/* Create STA entry for the WDS peer */
sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
GFP_KERNEL);
if (!sta) {
res = -ENOMEM;
goto err_del_interface;
}
sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
res = sta_info_insert(sta);
if (res) {
/* STA has been freed */
goto err_del_interface;
}
rate_control_rate_init(sta);
}
/*
* set_multicast_list will be invoked by the networking core
* which will check whether any increments here were done in
* error and sync them down to the hardware as filter flags.
*/
if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
atomic_inc(&local->iff_allmultis);
if (sdata->flags & IEEE80211_SDATA_PROMISC)
atomic_inc(&local->iff_promiscs);
mutex_lock(&local->mtx);
hw_reconf_flags |= __ieee80211_recalc_idle(local);
mutex_unlock(&local->mtx);
if (coming_up)
local->open_count++;
if (hw_reconf_flags)
ieee80211_hw_config(local, hw_reconf_flags);
ieee80211_recalc_ps(local, -1);
netif_tx_start_all_queues(dev);
return 0;
err_del_interface:
drv_remove_interface(local, sdata);
err_stop:
if (!local->open_count)
drv_stop(local);
err_del_bss:
sdata->bss = NULL;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
list_del(&sdata->u.vlan.list);
/* might already be clear but that doesn't matter */
clear_bit(SDATA_STATE_RUNNING, &sdata->state);
return res;
}
static int ieee80211_open(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
int err;
/* fail early if user set an invalid address */
if (!is_valid_ether_addr(dev->dev_addr))
return -EADDRNOTAVAIL;
err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
if (err)
return err;
return ieee80211_do_open(dev, true);
}
static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
bool going_down)
{
struct ieee80211_local *local = sdata->local;
unsigned long flags;
struct sk_buff *skb, *tmp;
u32 hw_reconf_flags = 0;
int i;
enum nl80211_channel_type orig_ct;
clear_bit(SDATA_STATE_RUNNING, &sdata->state);
if (local->scan_sdata == sdata)
ieee80211_scan_cancel(local);
/*
* Stop TX on this interface first.
*/
netif_tx_stop_all_queues(sdata->dev);
/*
* Purge work for this interface.
*/
ieee80211_work_purge(sdata);
/*
* Remove all stations associated with this interface.
*
* This must be done before calling ops->remove_interface()
* because otherwise we can later invoke ops->sta_notify()
* whenever the STAs are removed, and that invalidates driver
* assumptions about always getting a vif pointer that is valid
* (because if we remove a STA after ops->remove_interface()
* the driver will have removed the vif info already!)
*
* This is relevant only in AP, WDS and mesh modes, since in
* all other modes we've already removed all stations when
* disconnecting etc.
*/
sta_info_flush(local, sdata);
/*
* Don't count this interface for promisc/allmulti while it
* is down. dev_mc_unsync() will invoke set_multicast_list
* on the master interface which will sync these down to the
* hardware as filter flags.
*/
if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
atomic_dec(&local->iff_allmultis);
if (sdata->flags & IEEE80211_SDATA_PROMISC)
atomic_dec(&local->iff_promiscs);
if (sdata->vif.type == NL80211_IFTYPE_AP) {
local->fif_pspoll--;
local->fif_probe_req--;
} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
local->fif_probe_req--;
}
netif_addr_lock_bh(sdata->dev);
spin_lock_bh(&local->filter_lock);
__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
sdata->dev->addr_len);
spin_unlock_bh(&local->filter_lock);
netif_addr_unlock_bh(sdata->dev);
ieee80211_configure_filter(local);
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
/* APs need special treatment */
if (sdata->vif.type == NL80211_IFTYPE_AP) {
struct ieee80211_sub_if_data *vlan, *tmpsdata;
struct beacon_data *old_beacon =
rtnl_dereference(sdata->u.ap.beacon);
struct sk_buff *old_probe_resp =
rtnl_dereference(sdata->u.ap.probe_resp);
/* sdata_running will return false, so this will disable */
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_BEACON_ENABLED);
/* remove beacon and probe response */
RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
synchronize_rcu();
kfree(old_beacon);
kfree_skb(old_probe_resp);
/* down all dependent devices, that is VLANs */
list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
u.vlan.list)
dev_close(vlan->dev);
WARN_ON(!list_empty(&sdata->u.ap.vlans));
/* free all potentially still buffered bcast frames */
local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
skb_queue_purge(&sdata->u.ap.ps_bc_buf);
} else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
ieee80211_mgd_stop(sdata);
}
if (going_down)
local->open_count--;
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
list_del(&sdata->u.vlan.list);
/* no need to tell driver */
break;
case NL80211_IFTYPE_MONITOR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs--;
break;
}
local->monitors--;
if (local->monitors == 0) {
local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
ieee80211_del_virtual_monitor(local);
}
ieee80211_adjust_monitor_flags(sdata, -1);
ieee80211_configure_filter(local);
break;
default:
mutex_lock(&local->mtx);
if (local->hw_roc_dev == sdata->dev &&
local->hw_roc_channel) {
/* ignore return value since this is racy */
drv_cancel_remain_on_channel(local);
ieee80211_queue_work(&local->hw, &local->hw_roc_done);
}
mutex_unlock(&local->mtx);
flush_work(&local->hw_roc_start);
flush_work(&local->hw_roc_done);
flush_work(&sdata->work);
/*
* When we get here, the interface is marked down.
* Call synchronize_rcu() to wait for the RX path
* should it be using the interface and enqueuing
* frames at this very time on another CPU.
*/
synchronize_rcu();
skb_queue_purge(&sdata->skb_queue);
/*
* Disable beaconing here for mesh only, AP and IBSS
* are already taken care of.
*/
if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_BEACON_ENABLED);
/*
* Free all remaining keys, there shouldn't be any,
* except maybe group keys in AP more or WDS?
*/
ieee80211_free_keys(sdata);
if (going_down)
drv_remove_interface(local, sdata);
}
sdata->bss = NULL;
mutex_lock(&local->mtx);
hw_reconf_flags |= __ieee80211_recalc_idle(local);
mutex_unlock(&local->mtx);
ieee80211_recalc_ps(local, -1);
if (local->open_count == 0) {
if (local->ops->napi_poll)
napi_disable(&local->napi);
ieee80211_clear_tx_pending(local);
ieee80211_stop_device(local);
/* no reconfiguring after stop! */
hw_reconf_flags = 0;
}
/* Re-calculate channel-type, in case there are multiple vifs
* on different channel types.
*/
orig_ct = local->_oper_channel_type;
ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
/* do after stop to avoid reconfiguring when we stop anyway */
if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
ieee80211_hw_config(local, hw_reconf_flags);
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
skb_queue_walk_safe(&local->pending[i], skb, tmp) {
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
if (info->control.vif == &sdata->vif) {
__skb_unlink(skb, &local->pending[i]);
dev_kfree_skb_irq(skb);
}
}
}
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
if (local->monitors == local->open_count && local->monitors > 0)
ieee80211_add_virtual_monitor(local);
}
static int ieee80211_stop(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ieee80211_do_stop(sdata, true);
return 0;
}
static void ieee80211_set_multicast_list(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
int allmulti, promisc, sdata_allmulti, sdata_promisc;
allmulti = !!(dev->flags & IFF_ALLMULTI);
promisc = !!(dev->flags & IFF_PROMISC);
sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
if (allmulti != sdata_allmulti) {
if (dev->flags & IFF_ALLMULTI)
atomic_inc(&local->iff_allmultis);
else
atomic_dec(&local->iff_allmultis);
sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
}
if (promisc != sdata_promisc) {
if (dev->flags & IFF_PROMISC)
atomic_inc(&local->iff_promiscs);
else
atomic_dec(&local->iff_promiscs);
sdata->flags ^= IEEE80211_SDATA_PROMISC;
}
spin_lock_bh(&local->filter_lock);
__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
spin_unlock_bh(&local->filter_lock);
ieee80211_queue_work(&local->hw, &local->reconfig_filter);
}
/*
* Called when the netdev is removed or, by the code below, before
* the interface type changes.
*/
static void ieee80211_teardown_sdata(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
int flushed;
int i;
/* free extra data */
ieee80211_free_keys(sdata);
ieee80211_debugfs_remove_netdev(sdata);
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
__skb_queue_purge(&sdata->fragments[i].skb_list);
sdata->fragment_next = 0;
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_rmc_free(sdata);
flushed = sta_info_flush(local, sdata);
WARN_ON(flushed);
}
static u16 ieee80211_netdev_select_queue(struct net_device *dev,
struct sk_buff *skb)
{
return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
}
static const struct net_device_ops ieee80211_dataif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_teardown_sdata,
.ndo_start_xmit = ieee80211_subif_start_xmit,
.ndo_set_rx_mode = ieee80211_set_multicast_list,
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = ieee80211_change_mac,
.ndo_select_queue = ieee80211_netdev_select_queue,
};
static u16 ieee80211_monitor_select_queue(struct net_device *dev,
struct sk_buff *skb)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct ieee80211_hdr *hdr;
struct ieee80211_radiotap_header *rtap = (void *)skb->data;
if (local->hw.queues < IEEE80211_NUM_ACS)
return 0;
if (skb->len < 4 ||
skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
return 0; /* doesn't matter, frame will be dropped */
hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
return ieee80211_select_queue_80211(local, skb, hdr);
}
static const struct net_device_ops ieee80211_monitorif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_teardown_sdata,
.ndo_start_xmit = ieee80211_monitor_start_xmit,
.ndo_set_rx_mode = ieee80211_set_multicast_list,
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_select_queue = ieee80211_monitor_select_queue,
};
static void ieee80211_if_setup(struct net_device *dev)
{
ether_setup(dev);
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->netdev_ops = &ieee80211_dataif_ops;
dev->destructor = free_netdev;
}
static void ieee80211_iface_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data, work);
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct sta_info *sta;
struct ieee80211_ra_tid *ra_tid;
if (!ieee80211_sdata_running(sdata))
return;
if (local->scanning)
return;
/*
* ieee80211_queue_work() should have picked up most cases,
* here we'll pick the rest.
*/
if (WARN(local->suspended,
"interface work scheduled while going to suspend\n"))
return;
/* first process frames */
while ((skb = skb_dequeue(&sdata->skb_queue))) {
struct ieee80211_mgmt *mgmt = (void *)skb->data;
if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
ra_tid = (void *)&skb->cb;
ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
ra_tid->tid);
} else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
ra_tid = (void *)&skb->cb;
ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
ra_tid->tid);
} else if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_BACK) {
int len = skb->len;
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mgmt->sa);
if (sta) {
switch (mgmt->u.action.u.addba_req.action_code) {
case WLAN_ACTION_ADDBA_REQ:
ieee80211_process_addba_request(
local, sta, mgmt, len);
break;
case WLAN_ACTION_ADDBA_RESP:
ieee80211_process_addba_resp(local, sta,
mgmt, len);
break;
case WLAN_ACTION_DELBA:
ieee80211_process_delba(sdata, sta,
mgmt, len);
break;
default:
WARN_ON(1);
break;
}
}
mutex_unlock(&local->sta_mtx);
} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
struct ieee80211_hdr *hdr = (void *)mgmt;
/*
* So the frame isn't mgmt, but frame_control
* is at the right place anyway, of course, so
* the if statement is correct.
*
* Warn if we have other data frame types here,
* they must not get here.
*/
WARN_ON(hdr->frame_control &
cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
WARN_ON(!(hdr->seq_ctrl &
cpu_to_le16(IEEE80211_SCTL_FRAG)));
/*
* This was a fragment of a frame, received while
* a block-ack session was active. That cannot be
* right, so terminate the session.
*/
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mgmt->sa);
if (sta) {
u16 tid = *ieee80211_get_qos_ctl(hdr) &
IEEE80211_QOS_CTL_TID_MASK;
__ieee80211_stop_rx_ba_session(
sta, tid, WLAN_BACK_RECIPIENT,
WLAN_REASON_QSTA_REQUIRE_SETUP,
true);
}
mutex_unlock(&local->sta_mtx);
} else switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
ieee80211_sta_rx_queued_mgmt(sdata, skb);
break;
case NL80211_IFTYPE_ADHOC:
ieee80211_ibss_rx_queued_mgmt(sdata, skb);
break;
case NL80211_IFTYPE_MESH_POINT:
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
ieee80211_mesh_rx_queued_mgmt(sdata, skb);
break;
default:
WARN(1, "frame for unexpected interface type");
break;
}
kfree_skb(skb);
}
/* then other type-dependent work */
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
ieee80211_sta_work(sdata);
break;
case NL80211_IFTYPE_ADHOC:
ieee80211_ibss_work(sdata);
break;
case NL80211_IFTYPE_MESH_POINT:
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
ieee80211_mesh_work(sdata);
break;
default:
break;
}
}
/*
* Helper function to initialise an interface to a specific type.
*/
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
/* clear type-dependent union */
memset(&sdata->u, 0, sizeof(sdata->u));
/* and set some type-dependent values */
sdata->vif.type = type;
sdata->vif.p2p = false;
sdata->dev->netdev_ops = &ieee80211_dataif_ops;
sdata->wdev.iftype = type;
sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
sdata->control_port_no_encrypt = false;
sdata->noack_map = 0;
/* only monitor differs */
sdata->dev->type = ARPHRD_ETHER;