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Merge remote-tracking branch 'asoc/fix/core' into asoc-linus
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 int power;
49
50 rcu_read_lock();
51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 if (!chanctx_conf) {
53 rcu_read_unlock();
54 return false;
55 }
56
57 power = chanctx_conf->def.chan->max_power;
58 rcu_read_unlock();
59
60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 power = min(power, sdata->user_power_level);
62
63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->ap_power_level);
65
66 if (power != sdata->vif.bss_conf.txpower) {
67 sdata->vif.bss_conf.txpower = power;
68 ieee80211_hw_config(sdata->local, 0);
69 return true;
70 }
71
72 return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 if (__ieee80211_recalc_txpower(sdata))
78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
82 {
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 ieee80211_flush_queues(local, NULL);
96
97 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102 bool force_active)
103 {
104 bool working = false, scanning, active;
105 unsigned int led_trig_start = 0, led_trig_stop = 0;
106 struct ieee80211_roc_work *roc;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = force_active ||
111 !list_empty(&local->chanctx_list) ||
112 local->monitors;
113
114 if (!local->ops->remain_on_channel) {
115 list_for_each_entry(roc, &local->roc_list, list) {
116 working = true;
117 break;
118 }
119 }
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156 return -EINVAL;
157
158 dev->mtu = new_mtu;
159 return 0;
160 }
161
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr)
163 {
164 struct ieee80211_local *local = sdata->local;
165 struct ieee80211_sub_if_data *iter;
166 u64 new, mask, tmp;
167 u8 *m;
168 int ret = 0;
169
170 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
171 return 0;
172
173 m = addr;
174 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
175 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
176 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
177
178 m = local->hw.wiphy->addr_mask;
179 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
180 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
181 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
182
183
184 mutex_lock(&local->iflist_mtx);
185 list_for_each_entry(iter, &local->interfaces, list) {
186 if (iter == sdata)
187 continue;
188
189 if (iter->vif.type == NL80211_IFTYPE_MONITOR)
190 continue;
191
192 m = iter->vif.addr;
193 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
194 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
195 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
196
197 if ((new & ~mask) != (tmp & ~mask)) {
198 ret = -EINVAL;
199 break;
200 }
201 }
202 mutex_unlock(&local->iflist_mtx);
203
204 return ret;
205 }
206
207 static int ieee80211_change_mac(struct net_device *dev, void *addr)
208 {
209 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
210 struct sockaddr *sa = addr;
211 int ret;
212
213 if (ieee80211_sdata_running(sdata))
214 return -EBUSY;
215
216 ret = ieee80211_verify_mac(sdata, sa->sa_data);
217 if (ret)
218 return ret;
219
220 ret = eth_mac_addr(dev, sa);
221
222 if (ret == 0)
223 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
224
225 return ret;
226 }
227
228 static inline int identical_mac_addr_allowed(int type1, int type2)
229 {
230 return type1 == NL80211_IFTYPE_MONITOR ||
231 type2 == NL80211_IFTYPE_MONITOR ||
232 type1 == NL80211_IFTYPE_P2P_DEVICE ||
233 type2 == NL80211_IFTYPE_P2P_DEVICE ||
234 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
235 (type1 == NL80211_IFTYPE_WDS &&
236 (type2 == NL80211_IFTYPE_WDS ||
237 type2 == NL80211_IFTYPE_AP)) ||
238 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
239 (type1 == NL80211_IFTYPE_AP_VLAN &&
240 (type2 == NL80211_IFTYPE_AP ||
241 type2 == NL80211_IFTYPE_AP_VLAN));
242 }
243
244 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
245 enum nl80211_iftype iftype)
246 {
247 struct ieee80211_local *local = sdata->local;
248 struct ieee80211_sub_if_data *nsdata;
249
250 ASSERT_RTNL();
251
252 /* we hold the RTNL here so can safely walk the list */
253 list_for_each_entry(nsdata, &local->interfaces, list) {
254 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
255 /*
256 * Allow only a single IBSS interface to be up at any
257 * time. This is restricted because beacon distribution
258 * cannot work properly if both are in the same IBSS.
259 *
260 * To remove this restriction we'd have to disallow them
261 * from setting the same SSID on different IBSS interfaces
262 * belonging to the same hardware. Then, however, we're
263 * faced with having to adopt two different TSF timers...
264 */
265 if (iftype == NL80211_IFTYPE_ADHOC &&
266 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
267 return -EBUSY;
268
269 /*
270 * The remaining checks are only performed for interfaces
271 * with the same MAC address.
272 */
273 if (!ether_addr_equal(sdata->vif.addr,
274 nsdata->vif.addr))
275 continue;
276
277 /*
278 * check whether it may have the same address
279 */
280 if (!identical_mac_addr_allowed(iftype,
281 nsdata->vif.type))
282 return -ENOTUNIQ;
283
284 /*
285 * can only add VLANs to enabled APs
286 */
287 if (iftype == NL80211_IFTYPE_AP_VLAN &&
288 nsdata->vif.type == NL80211_IFTYPE_AP)
289 sdata->bss = &nsdata->u.ap;
290 }
291 }
292
293 return 0;
294 }
295
296 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
297 {
298 int n_queues = sdata->local->hw.queues;
299 int i;
300
301 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
302 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
303 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
304 IEEE80211_INVAL_HW_QUEUE))
305 return -EINVAL;
306 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
307 n_queues))
308 return -EINVAL;
309 }
310 }
311
312 if ((sdata->vif.type != NL80211_IFTYPE_AP &&
313 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
314 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
315 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
316 return 0;
317 }
318
319 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
320 return -EINVAL;
321
322 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
323 return -EINVAL;
324
325 return 0;
326 }
327
328 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
329 const int offset)
330 {
331 struct ieee80211_local *local = sdata->local;
332 u32 flags = sdata->u.mntr_flags;
333
334 #define ADJUST(_f, _s) do { \
335 if (flags & MONITOR_FLAG_##_f) \
336 local->fif_##_s += offset; \
337 } while (0)
338
339 ADJUST(FCSFAIL, fcsfail);
340 ADJUST(PLCPFAIL, plcpfail);
341 ADJUST(CONTROL, control);
342 ADJUST(CONTROL, pspoll);
343 ADJUST(OTHER_BSS, other_bss);
344
345 #undef ADJUST
346 }
347
348 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
349 {
350 struct ieee80211_local *local = sdata->local;
351 int i;
352
353 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
354 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
355 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
356 else if (local->hw.queues >= IEEE80211_NUM_ACS)
357 sdata->vif.hw_queue[i] = i;
358 else
359 sdata->vif.hw_queue[i] = 0;
360 }
361 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
362 }
363
364 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
365 {
366 struct ieee80211_sub_if_data *sdata;
367 int ret;
368
369 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
370 return 0;
371
372 ASSERT_RTNL();
373
374 if (local->monitor_sdata)
375 return 0;
376
377 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
378 if (!sdata)
379 return -ENOMEM;
380
381 /* set up data */
382 sdata->local = local;
383 sdata->vif.type = NL80211_IFTYPE_MONITOR;
384 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
385 wiphy_name(local->hw.wiphy));
386
387 ieee80211_set_default_queues(sdata);
388
389 ret = drv_add_interface(local, sdata);
390 if (WARN_ON(ret)) {
391 /* ok .. stupid driver, it asked for this! */
392 kfree(sdata);
393 return ret;
394 }
395
396 ret = ieee80211_check_queues(sdata);
397 if (ret) {
398 kfree(sdata);
399 return ret;
400 }
401
402 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
403 IEEE80211_CHANCTX_EXCLUSIVE);
404 if (ret) {
405 drv_remove_interface(local, sdata);
406 kfree(sdata);
407 return ret;
408 }
409
410 mutex_lock(&local->iflist_mtx);
411 rcu_assign_pointer(local->monitor_sdata, sdata);
412 mutex_unlock(&local->iflist_mtx);
413
414 return 0;
415 }
416
417 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
418 {
419 struct ieee80211_sub_if_data *sdata;
420
421 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
422 return;
423
424 ASSERT_RTNL();
425
426 mutex_lock(&local->iflist_mtx);
427
428 sdata = rcu_dereference_protected(local->monitor_sdata,
429 lockdep_is_held(&local->iflist_mtx));
430 if (!sdata) {
431 mutex_unlock(&local->iflist_mtx);
432 return;
433 }
434
435 rcu_assign_pointer(local->monitor_sdata, NULL);
436 mutex_unlock(&local->iflist_mtx);
437
438 synchronize_net();
439
440 ieee80211_vif_release_channel(sdata);
441
442 drv_remove_interface(local, sdata);
443
444 kfree(sdata);
445 }
446
447 /*
448 * NOTE: Be very careful when changing this function, it must NOT return
449 * an error on interface type changes that have been pre-checked, so most
450 * checks should be in ieee80211_check_concurrent_iface.
451 */
452 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
453 {
454 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
455 struct net_device *dev = wdev->netdev;
456 struct ieee80211_local *local = sdata->local;
457 struct sta_info *sta;
458 u32 changed = 0;
459 int res;
460 u32 hw_reconf_flags = 0;
461
462 switch (sdata->vif.type) {
463 case NL80211_IFTYPE_WDS:
464 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
465 return -ENOLINK;
466 break;
467 case NL80211_IFTYPE_AP_VLAN: {
468 struct ieee80211_sub_if_data *master;
469
470 if (!sdata->bss)
471 return -ENOLINK;
472
473 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
474
475 master = container_of(sdata->bss,
476 struct ieee80211_sub_if_data, u.ap);
477 sdata->control_port_protocol =
478 master->control_port_protocol;
479 sdata->control_port_no_encrypt =
480 master->control_port_no_encrypt;
481 sdata->vif.cab_queue = master->vif.cab_queue;
482 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
483 sizeof(sdata->vif.hw_queue));
484 break;
485 }
486 case NL80211_IFTYPE_AP:
487 sdata->bss = &sdata->u.ap;
488 break;
489 case NL80211_IFTYPE_MESH_POINT:
490 case NL80211_IFTYPE_STATION:
491 case NL80211_IFTYPE_MONITOR:
492 case NL80211_IFTYPE_ADHOC:
493 case NL80211_IFTYPE_P2P_DEVICE:
494 /* no special treatment */
495 break;
496 case NL80211_IFTYPE_UNSPECIFIED:
497 case NUM_NL80211_IFTYPES:
498 case NL80211_IFTYPE_P2P_CLIENT:
499 case NL80211_IFTYPE_P2P_GO:
500 /* cannot happen */
501 WARN_ON(1);
502 break;
503 }
504
505 if (local->open_count == 0) {
506 res = drv_start(local);
507 if (res)
508 goto err_del_bss;
509 /* we're brought up, everything changes */
510 hw_reconf_flags = ~0;
511 ieee80211_led_radio(local, true);
512 ieee80211_mod_tpt_led_trig(local,
513 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
514 }
515
516 /*
517 * Copy the hopefully now-present MAC address to
518 * this interface, if it has the special null one.
519 */
520 if (dev && is_zero_ether_addr(dev->dev_addr)) {
521 memcpy(dev->dev_addr,
522 local->hw.wiphy->perm_addr,
523 ETH_ALEN);
524 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
525
526 if (!is_valid_ether_addr(dev->dev_addr)) {
527 res = -EADDRNOTAVAIL;
528 goto err_stop;
529 }
530 }
531
532 switch (sdata->vif.type) {
533 case NL80211_IFTYPE_AP_VLAN:
534 /* no need to tell driver, but set carrier and chanctx */
535 if (rtnl_dereference(sdata->bss->beacon)) {
536 ieee80211_vif_vlan_copy_chanctx(sdata);
537 netif_carrier_on(dev);
538 } else {
539 netif_carrier_off(dev);
540 }
541 break;
542 case NL80211_IFTYPE_MONITOR:
543 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
544 local->cooked_mntrs++;
545 break;
546 }
547
548 if (local->monitors == 0 && local->open_count == 0) {
549 res = ieee80211_add_virtual_monitor(local);
550 if (res)
551 goto err_stop;
552 }
553
554 /* must be before the call to ieee80211_configure_filter */
555 local->monitors++;
556 if (local->monitors == 1) {
557 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
558 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
559 }
560
561 ieee80211_adjust_monitor_flags(sdata, 1);
562 ieee80211_configure_filter(local);
563 mutex_lock(&local->mtx);
564 ieee80211_recalc_idle(local);
565 mutex_unlock(&local->mtx);
566
567 netif_carrier_on(dev);
568 break;
569 default:
570 if (coming_up) {
571 ieee80211_del_virtual_monitor(local);
572
573 res = drv_add_interface(local, sdata);
574 if (res)
575 goto err_stop;
576 res = ieee80211_check_queues(sdata);
577 if (res)
578 goto err_del_interface;
579 }
580
581 if (sdata->vif.type == NL80211_IFTYPE_AP) {
582 local->fif_pspoll++;
583 local->fif_probe_req++;
584
585 ieee80211_configure_filter(local);
586 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
587 local->fif_probe_req++;
588 }
589
590 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
591 changed |= ieee80211_reset_erp_info(sdata);
592 ieee80211_bss_info_change_notify(sdata, changed);
593
594 switch (sdata->vif.type) {
595 case NL80211_IFTYPE_STATION:
596 case NL80211_IFTYPE_ADHOC:
597 case NL80211_IFTYPE_AP:
598 case NL80211_IFTYPE_MESH_POINT:
599 netif_carrier_off(dev);
600 break;
601 case NL80211_IFTYPE_WDS:
602 case NL80211_IFTYPE_P2P_DEVICE:
603 break;
604 default:
605 /* not reached */
606 WARN_ON(1);
607 }
608
609 /*
610 * set default queue parameters so drivers don't
611 * need to initialise the hardware if the hardware
612 * doesn't start up with sane defaults
613 */
614 ieee80211_set_wmm_default(sdata, true);
615 }
616
617 set_bit(SDATA_STATE_RUNNING, &sdata->state);
618
619 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
620 /* Create STA entry for the WDS peer */
621 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
622 GFP_KERNEL);
623 if (!sta) {
624 res = -ENOMEM;
625 goto err_del_interface;
626 }
627
628 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
629 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
630 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
631
632 res = sta_info_insert(sta);
633 if (res) {
634 /* STA has been freed */
635 goto err_del_interface;
636 }
637
638 rate_control_rate_init(sta);
639 netif_carrier_on(dev);
640 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
641 rcu_assign_pointer(local->p2p_sdata, sdata);
642 }
643
644 /*
645 * set_multicast_list will be invoked by the networking core
646 * which will check whether any increments here were done in
647 * error and sync them down to the hardware as filter flags.
648 */
649 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
650 atomic_inc(&local->iff_allmultis);
651
652 if (sdata->flags & IEEE80211_SDATA_PROMISC)
653 atomic_inc(&local->iff_promiscs);
654
655 if (coming_up)
656 local->open_count++;
657
658 if (hw_reconf_flags)
659 ieee80211_hw_config(local, hw_reconf_flags);
660
661 ieee80211_recalc_ps(local, -1);
662
663 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
664 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
665 /* XXX: for AP_VLAN, actually track AP queues */
666 netif_tx_start_all_queues(dev);
667 } else if (dev) {
668 unsigned long flags;
669 int n_acs = IEEE80211_NUM_ACS;
670 int ac;
671
672 if (local->hw.queues < IEEE80211_NUM_ACS)
673 n_acs = 1;
674
675 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
676 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
677 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
678 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
679 for (ac = 0; ac < n_acs; ac++) {
680 int ac_queue = sdata->vif.hw_queue[ac];
681
682 if (local->queue_stop_reasons[ac_queue] == 0 &&
683 skb_queue_empty(&local->pending[ac_queue]))
684 netif_start_subqueue(dev, ac);
685 }
686 }
687 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
688 }
689
690 return 0;
691 err_del_interface:
692 drv_remove_interface(local, sdata);
693 err_stop:
694 if (!local->open_count)
695 drv_stop(local);
696 err_del_bss:
697 sdata->bss = NULL;
698 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
699 list_del(&sdata->u.vlan.list);
700 /* might already be clear but that doesn't matter */
701 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
702 return res;
703 }
704
705 static int ieee80211_open(struct net_device *dev)
706 {
707 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
708 int err;
709
710 /* fail early if user set an invalid address */
711 if (!is_valid_ether_addr(dev->dev_addr))
712 return -EADDRNOTAVAIL;
713
714 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
715 if (err)
716 return err;
717
718 return ieee80211_do_open(&sdata->wdev, true);
719 }
720
721 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
722 bool going_down)
723 {
724 struct ieee80211_local *local = sdata->local;
725 unsigned long flags;
726 struct sk_buff *skb, *tmp;
727 u32 hw_reconf_flags = 0;
728 int i, flushed;
729 struct ps_data *ps;
730
731 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
732
733 if (rcu_access_pointer(local->scan_sdata) == sdata)
734 ieee80211_scan_cancel(local);
735
736 /*
737 * Stop TX on this interface first.
738 */
739 if (sdata->dev)
740 netif_tx_stop_all_queues(sdata->dev);
741
742 ieee80211_roc_purge(local, sdata);
743
744 if (sdata->vif.type == NL80211_IFTYPE_STATION)
745 ieee80211_mgd_stop(sdata);
746
747 /*
748 * Remove all stations associated with this interface.
749 *
750 * This must be done before calling ops->remove_interface()
751 * because otherwise we can later invoke ops->sta_notify()
752 * whenever the STAs are removed, and that invalidates driver
753 * assumptions about always getting a vif pointer that is valid
754 * (because if we remove a STA after ops->remove_interface()
755 * the driver will have removed the vif info already!)
756 *
757 * This is relevant only in WDS mode, in all other modes we've
758 * already removed all stations when disconnecting or similar,
759 * so warn otherwise.
760 *
761 * We call sta_info_flush_cleanup() later, to combine RCU waits.
762 */
763 flushed = sta_info_flush_defer(sdata);
764 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
765 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
766
767 /* don't count this interface for promisc/allmulti while it is down */
768 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
769 atomic_dec(&local->iff_allmultis);
770
771 if (sdata->flags & IEEE80211_SDATA_PROMISC)
772 atomic_dec(&local->iff_promiscs);
773
774 if (sdata->vif.type == NL80211_IFTYPE_AP) {
775 local->fif_pspoll--;
776 local->fif_probe_req--;
777 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
778 local->fif_probe_req--;
779 }
780
781 if (sdata->dev) {
782 netif_addr_lock_bh(sdata->dev);
783 spin_lock_bh(&local->filter_lock);
784 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
785 sdata->dev->addr_len);
786 spin_unlock_bh(&local->filter_lock);
787 netif_addr_unlock_bh(sdata->dev);
788 }
789
790 del_timer_sync(&local->dynamic_ps_timer);
791 cancel_work_sync(&local->dynamic_ps_enable_work);
792
793 cancel_work_sync(&sdata->recalc_smps);
794
795 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
796
797 if (sdata->wdev.cac_started) {
798 WARN_ON(local->suspended);
799 mutex_lock(&local->iflist_mtx);
800 ieee80211_vif_release_channel(sdata);
801 mutex_unlock(&local->iflist_mtx);
802 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
803 GFP_KERNEL);
804 }
805
806 /* APs need special treatment */
807 if (sdata->vif.type == NL80211_IFTYPE_AP) {
808 struct ieee80211_sub_if_data *vlan, *tmpsdata;
809
810 /* down all dependent devices, that is VLANs */
811 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
812 u.vlan.list)
813 dev_close(vlan->dev);
814 WARN_ON(!list_empty(&sdata->u.ap.vlans));
815 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
816 /* remove all packets in parent bc_buf pointing to this dev */
817 ps = &sdata->bss->ps;
818
819 spin_lock_irqsave(&ps->bc_buf.lock, flags);
820 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
821 if (skb->dev == sdata->dev) {
822 __skb_unlink(skb, &ps->bc_buf);
823 local->total_ps_buffered--;
824 ieee80211_free_txskb(&local->hw, skb);
825 }
826 }
827 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
828 }
829
830 if (going_down)
831 local->open_count--;
832
833 switch (sdata->vif.type) {
834 case NL80211_IFTYPE_AP_VLAN:
835 list_del(&sdata->u.vlan.list);
836 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
837 /* no need to tell driver */
838 break;
839 case NL80211_IFTYPE_MONITOR:
840 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
841 local->cooked_mntrs--;
842 break;
843 }
844
845 local->monitors--;
846 if (local->monitors == 0) {
847 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
848 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
849 }
850
851 ieee80211_adjust_monitor_flags(sdata, -1);
852 break;
853 case NL80211_IFTYPE_P2P_DEVICE:
854 /* relies on synchronize_rcu() below */
855 rcu_assign_pointer(local->p2p_sdata, NULL);
856 /* fall through */
857 default:
858 cancel_work_sync(&sdata->work);
859 /*
860 * When we get here, the interface is marked down.
861 *
862 * sta_info_flush_cleanup() requires rcu_barrier()
863 * first to wait for the station call_rcu() calls
864 * to complete, and we also need synchronize_rcu()
865 * to wait for the RX path in case it is using the
866 * interface and enqueuing frames at this very time on
867 * another CPU.
868 */
869 synchronize_rcu();
870 rcu_barrier();
871 sta_info_flush_cleanup(sdata);
872
873 /*
874 * Free all remaining keys, there shouldn't be any,
875 * except maybe in WDS mode?
876 */
877 ieee80211_free_keys(sdata);
878
879 /* fall through */
880 case NL80211_IFTYPE_AP:
881 skb_queue_purge(&sdata->skb_queue);
882 }
883
884 sdata->bss = NULL;
885
886 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
887 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
888 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
889 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
890 if (info->control.vif == &sdata->vif) {
891 __skb_unlink(skb, &local->pending[i]);
892 ieee80211_free_txskb(&local->hw, skb);
893 }
894 }
895 }
896 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
897
898 if (local->open_count == 0)
899 ieee80211_clear_tx_pending(local);
900
901 /*
902 * If the interface goes down while suspended, presumably because
903 * the device was unplugged and that happens before our resume,
904 * then the driver is already unconfigured and the remainder of
905 * this function isn't needed.
906 * XXX: what about WoWLAN? If the device has software state, e.g.
907 * memory allocated, it might expect teardown commands from
908 * mac80211 here?
909 */
910 if (local->suspended) {
911 WARN_ON(local->wowlan);
912 WARN_ON(rtnl_dereference(local->monitor_sdata));
913 return;
914 }
915
916 switch (sdata->vif.type) {
917 case NL80211_IFTYPE_AP_VLAN:
918 break;
919 case NL80211_IFTYPE_MONITOR:
920 if (local->monitors == 0)
921 ieee80211_del_virtual_monitor(local);
922
923 mutex_lock(&local->mtx);
924 ieee80211_recalc_idle(local);
925 mutex_unlock(&local->mtx);
926 break;
927 default:
928 if (going_down)
929 drv_remove_interface(local, sdata);
930 }
931
932 ieee80211_recalc_ps(local, -1);
933
934 if (local->open_count == 0) {
935 ieee80211_stop_device(local);
936
937 /* no reconfiguring after stop! */
938 return;
939 }
940
941 /* do after stop to avoid reconfiguring when we stop anyway */
942 ieee80211_configure_filter(local);
943 ieee80211_hw_config(local, hw_reconf_flags);
944
945 if (local->monitors == local->open_count)
946 ieee80211_add_virtual_monitor(local);
947 }
948
949 static int ieee80211_stop(struct net_device *dev)
950 {
951 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
952
953 ieee80211_do_stop(sdata, true);
954
955 return 0;
956 }
957
958 static void ieee80211_set_multicast_list(struct net_device *dev)
959 {
960 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
961 struct ieee80211_local *local = sdata->local;
962 int allmulti, promisc, sdata_allmulti, sdata_promisc;
963
964 allmulti = !!(dev->flags & IFF_ALLMULTI);
965 promisc = !!(dev->flags & IFF_PROMISC);
966 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
967 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
968
969 if (allmulti != sdata_allmulti) {
970 if (dev->flags & IFF_ALLMULTI)
971 atomic_inc(&local->iff_allmultis);
972 else
973 atomic_dec(&local->iff_allmultis);
974 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
975 }
976
977 if (promisc != sdata_promisc) {
978 if (dev->flags & IFF_PROMISC)
979 atomic_inc(&local->iff_promiscs);
980 else
981 atomic_dec(&local->iff_promiscs);
982 sdata->flags ^= IEEE80211_SDATA_PROMISC;
983 }
984
985 /*
986 * TODO: If somebody needs this on AP interfaces,
987 * it can be enabled easily but multicast
988 * addresses from VLANs need to be synced.
989 */
990 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
991 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
992 sdata->vif.type != NL80211_IFTYPE_AP)
993 drv_set_multicast_list(local, sdata, &dev->mc);
994
995 spin_lock_bh(&local->filter_lock);
996 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
997 spin_unlock_bh(&local->filter_lock);
998 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
999 }
1000
1001 /*
1002 * Called when the netdev is removed or, by the code below, before
1003 * the interface type changes.
1004 */
1005 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1006 {
1007 int flushed;
1008 int i;
1009
1010 /* free extra data */
1011 ieee80211_free_keys(sdata);
1012
1013 ieee80211_debugfs_remove_netdev(sdata);
1014
1015 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1016 __skb_queue_purge(&sdata->fragments[i].skb_list);
1017 sdata->fragment_next = 0;
1018
1019 if (ieee80211_vif_is_mesh(&sdata->vif))
1020 mesh_rmc_free(sdata);
1021
1022 flushed = sta_info_flush(sdata);
1023 WARN_ON(flushed);
1024 }
1025
1026 static void ieee80211_uninit(struct net_device *dev)
1027 {
1028 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1029 }
1030
1031 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1032 struct sk_buff *skb)
1033 {
1034 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1035 }
1036
1037 static const struct net_device_ops ieee80211_dataif_ops = {
1038 .ndo_open = ieee80211_open,
1039 .ndo_stop = ieee80211_stop,
1040 .ndo_uninit = ieee80211_uninit,
1041 .ndo_start_xmit = ieee80211_subif_start_xmit,
1042 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1043 .ndo_change_mtu = ieee80211_change_mtu,
1044 .ndo_set_mac_address = ieee80211_change_mac,
1045 .ndo_select_queue = ieee80211_netdev_select_queue,
1046 };
1047
1048 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1049 struct sk_buff *skb)
1050 {
1051 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1052 struct ieee80211_local *local = sdata->local;
1053 struct ieee80211_hdr *hdr;
1054 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1055
1056 if (local->hw.queues < IEEE80211_NUM_ACS)
1057 return 0;
1058
1059 if (skb->len < 4 ||
1060 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1061 return 0; /* doesn't matter, frame will be dropped */
1062
1063 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1064
1065 return ieee80211_select_queue_80211(sdata, skb, hdr);
1066 }
1067
1068 static const struct net_device_ops ieee80211_monitorif_ops = {
1069 .ndo_open = ieee80211_open,
1070 .ndo_stop = ieee80211_stop,
1071 .ndo_uninit = ieee80211_uninit,
1072 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1073 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1074 .ndo_change_mtu = ieee80211_change_mtu,
1075 .ndo_set_mac_address = eth_mac_addr,
1076 .ndo_select_queue = ieee80211_monitor_select_queue,
1077 };
1078
1079 static void ieee80211_if_setup(struct net_device *dev)
1080 {
1081 ether_setup(dev);
1082 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1083 dev->netdev_ops = &ieee80211_dataif_ops;
1084 dev->destructor = free_netdev;
1085 }
1086
1087 static void ieee80211_iface_work(struct work_struct *work)
1088 {
1089 struct ieee80211_sub_if_data *sdata =
1090 container_of(work, struct ieee80211_sub_if_data, work);
1091 struct ieee80211_local *local = sdata->local;
1092 struct sk_buff *skb;
1093 struct sta_info *sta;
1094 struct ieee80211_ra_tid *ra_tid;
1095
1096 if (!ieee80211_sdata_running(sdata))
1097 return;
1098
1099 if (local->scanning)
1100 return;
1101
1102 /*
1103 * ieee80211_queue_work() should have picked up most cases,
1104 * here we'll pick the rest.
1105 */
1106 if (WARN(local->suspended,
1107 "interface work scheduled while going to suspend\n"))
1108 return;
1109
1110 /* first process frames */
1111 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1112 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1113
1114 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1115 ra_tid = (void *)&skb->cb;
1116 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1117 ra_tid->tid);
1118 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1119 ra_tid = (void *)&skb->cb;
1120 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1121 ra_tid->tid);
1122 } else if (ieee80211_is_action(mgmt->frame_control) &&
1123 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1124 int len = skb->len;
1125
1126 mutex_lock(&local->sta_mtx);
1127 sta = sta_info_get_bss(sdata, mgmt->sa);
1128 if (sta) {
1129 switch (mgmt->u.action.u.addba_req.action_code) {
1130 case WLAN_ACTION_ADDBA_REQ:
1131 ieee80211_process_addba_request(
1132 local, sta, mgmt, len);
1133 break;
1134 case WLAN_ACTION_ADDBA_RESP:
1135 ieee80211_process_addba_resp(local, sta,
1136 mgmt, len);
1137 break;
1138 case WLAN_ACTION_DELBA:
1139 ieee80211_process_delba(sdata, sta,
1140 mgmt, len);
1141 break;
1142 default:
1143 WARN_ON(1);
1144 break;
1145 }
1146 }
1147 mutex_unlock(&local->sta_mtx);
1148 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1149 struct ieee80211_hdr *hdr = (void *)mgmt;
1150 /*
1151 * So the frame isn't mgmt, but frame_control
1152 * is at the right place anyway, of course, so
1153 * the if statement is correct.
1154 *
1155 * Warn if we have other data frame types here,
1156 * they must not get here.
1157 */
1158 WARN_ON(hdr->frame_control &
1159 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1160 WARN_ON(!(hdr->seq_ctrl &
1161 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1162 /*
1163 * This was a fragment of a frame, received while
1164 * a block-ack session was active. That cannot be
1165 * right, so terminate the session.
1166 */
1167 mutex_lock(&local->sta_mtx);
1168 sta = sta_info_get_bss(sdata, mgmt->sa);
1169 if (sta) {
1170 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1171 IEEE80211_QOS_CTL_TID_MASK;
1172
1173 __ieee80211_stop_rx_ba_session(
1174 sta, tid, WLAN_BACK_RECIPIENT,
1175 WLAN_REASON_QSTA_REQUIRE_SETUP,
1176 true);
1177 }
1178 mutex_unlock(&local->sta_mtx);
1179 } else switch (sdata->vif.type) {
1180 case NL80211_IFTYPE_STATION:
1181 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1182 break;
1183 case NL80211_IFTYPE_ADHOC:
1184 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1185 break;
1186 case NL80211_IFTYPE_MESH_POINT:
1187 if (!ieee80211_vif_is_mesh(&sdata->vif))
1188 break;
1189 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1190 break;
1191 default:
1192 WARN(1, "frame for unexpected interface type");
1193 break;
1194 }
1195
1196 kfree_skb(skb);
1197 }
1198
1199 /* then other type-dependent work */
1200 switch (sdata->vif.type) {
1201 case NL80211_IFTYPE_STATION:
1202 ieee80211_sta_work(sdata);
1203 break;
1204 case NL80211_IFTYPE_ADHOC:
1205 ieee80211_ibss_work(sdata);
1206 break;
1207 case NL80211_IFTYPE_MESH_POINT:
1208 if (!ieee80211_vif_is_mesh(&sdata->vif))
1209 break;
1210 ieee80211_mesh_work(sdata);
1211 break;
1212 default:
1213 break;
1214 }
1215 }
1216
1217 static void ieee80211_recalc_smps_work(struct work_struct *work)
1218 {
1219 struct ieee80211_sub_if_data *sdata =
1220 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1221
1222 ieee80211_recalc_smps(sdata);
1223 }
1224
1225 /*
1226 * Helper function to initialise an interface to a specific type.
1227 */
1228 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1229 enum nl80211_iftype type)
1230 {
1231 /* clear type-dependent union */
1232 memset(&sdata->u, 0, sizeof(sdata->u));
1233
1234 /* and set some type-dependent values */
1235 sdata->vif.type = type;
1236 sdata->vif.p2p = false;
1237 sdata->wdev.iftype = type;
1238
1239 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1240 sdata->control_port_no_encrypt = false;
1241
1242 sdata->noack_map = 0;
1243
1244 /* only monitor/p2p-device differ */
1245 if (sdata->dev) {
1246 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1247 sdata->dev->type = ARPHRD_ETHER;
1248 }
1249
1250 skb_queue_head_init(&sdata->skb_queue);
1251 INIT_WORK(&sdata->work, ieee80211_iface_work);
1252 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1253
1254 switch (type) {
1255 case NL80211_IFTYPE_P2P_GO:
1256 type = NL80211_IFTYPE_AP;
1257 sdata->vif.type = type;
1258 sdata->vif.p2p = true;
1259 /* fall through */
1260 case NL80211_IFTYPE_AP:
1261 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1262 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1263 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1264 break;
1265 case NL80211_IFTYPE_P2P_CLIENT:
1266 type = NL80211_IFTYPE_STATION;
1267 sdata->vif.type = type;
1268 sdata->vif.p2p = true;
1269 /* fall through */
1270 case NL80211_IFTYPE_STATION:
1271 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1272 ieee80211_sta_setup_sdata(sdata);
1273 break;
1274 case NL80211_IFTYPE_ADHOC:
1275 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1276 ieee80211_ibss_setup_sdata(sdata);
1277 break;
1278 case NL80211_IFTYPE_MESH_POINT:
1279 if (ieee80211_vif_is_mesh(&sdata->vif))
1280 ieee80211_mesh_init_sdata(sdata);
1281 break;
1282 case NL80211_IFTYPE_MONITOR:
1283 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1284 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1285 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1286 MONITOR_FLAG_OTHER_BSS;
1287 break;
1288 case NL80211_IFTYPE_WDS:
1289 sdata->vif.bss_conf.bssid = NULL;
1290 break;
1291 case NL80211_IFTYPE_AP_VLAN:
1292 break;
1293 case NL80211_IFTYPE_P2P_DEVICE:
1294 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1295 break;
1296 case NL80211_IFTYPE_UNSPECIFIED:
1297 case NUM_NL80211_IFTYPES:
1298 BUG();
1299 break;
1300 }
1301
1302 ieee80211_debugfs_add_netdev(sdata);
1303 }
1304
1305 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1306 enum nl80211_iftype type)
1307 {
1308 struct ieee80211_local *local = sdata->local;
1309 int ret, err;
1310 enum nl80211_iftype internal_type = type;
1311 bool p2p = false;
1312
1313 ASSERT_RTNL();
1314
1315 if (!local->ops->change_interface)
1316 return -EBUSY;
1317
1318 switch (sdata->vif.type) {
1319 case NL80211_IFTYPE_AP:
1320 case NL80211_IFTYPE_STATION:
1321 case NL80211_IFTYPE_ADHOC:
1322 /*
1323 * Could maybe also all others here?
1324 * Just not sure how that interacts
1325 * with the RX/config path e.g. for
1326 * mesh.
1327 */
1328 break;
1329 default:
1330 return -EBUSY;
1331 }
1332
1333 switch (type) {
1334 case NL80211_IFTYPE_AP:
1335 case NL80211_IFTYPE_STATION:
1336 case NL80211_IFTYPE_ADHOC:
1337 /*
1338 * Could probably support everything
1339 * but WDS here (WDS do_open can fail
1340 * under memory pressure, which this
1341 * code isn't prepared to handle).
1342 */
1343 break;
1344 case NL80211_IFTYPE_P2P_CLIENT:
1345 p2p = true;
1346 internal_type = NL80211_IFTYPE_STATION;
1347 break;
1348 case NL80211_IFTYPE_P2P_GO:
1349 p2p = true;
1350 internal_type = NL80211_IFTYPE_AP;
1351 break;
1352 default:
1353 return -EBUSY;
1354 }
1355
1356 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1357 if (ret)
1358 return ret;
1359
1360 ieee80211_do_stop(sdata, false);
1361
1362 ieee80211_teardown_sdata(sdata);
1363
1364 ret = drv_change_interface(local, sdata, internal_type, p2p);
1365 if (ret)
1366 type = sdata->vif.type;
1367
1368 /*
1369 * Ignore return value here, there's not much we can do since
1370 * the driver changed the interface type internally already.
1371 * The warnings will hopefully make driver authors fix it :-)
1372 */
1373 ieee80211_check_queues(sdata);
1374
1375 ieee80211_setup_sdata(sdata, type);
1376
1377 err = ieee80211_do_open(&sdata->wdev, false);
1378 WARN(err, "type change: do_open returned %d", err);
1379
1380 return ret;
1381 }
1382
1383 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1384 enum nl80211_iftype type)
1385 {
1386 int ret;
1387
1388 ASSERT_RTNL();
1389
1390 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1391 return 0;
1392
1393 if (ieee80211_sdata_running(sdata)) {
1394 ret = ieee80211_runtime_change_iftype(sdata, type);
1395 if (ret)
1396 return ret;
1397 } else {
1398 /* Purge and reset type-dependent state. */
1399 ieee80211_teardown_sdata(sdata);
1400 ieee80211_setup_sdata(sdata, type);
1401 }
1402
1403 /* reset some values that shouldn't be kept across type changes */
1404 sdata->drop_unencrypted = 0;
1405 if (type == NL80211_IFTYPE_STATION)
1406 sdata->u.mgd.use_4addr = false;
1407
1408 return 0;
1409 }
1410
1411 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1412 u8 *perm_addr, enum nl80211_iftype type)
1413 {
1414 struct ieee80211_sub_if_data *sdata;
1415 u64 mask, start, addr, val, inc;
1416 u8 *m;
1417 u8 tmp_addr[ETH_ALEN];
1418 int i;
1419
1420 /* default ... something at least */
1421 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1422
1423 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1424 local->hw.wiphy->n_addresses <= 1)
1425 return;
1426
1427 mutex_lock(&local->iflist_mtx);
1428
1429 switch (type) {
1430 case NL80211_IFTYPE_MONITOR:
1431 /* doesn't matter */
1432 break;
1433 case NL80211_IFTYPE_WDS:
1434 case NL80211_IFTYPE_AP_VLAN:
1435 /* match up with an AP interface */
1436 list_for_each_entry(sdata, &local->interfaces, list) {
1437 if (sdata->vif.type != NL80211_IFTYPE_AP)
1438 continue;
1439 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1440 break;
1441 }
1442 /* keep default if no AP interface present */
1443 break;
1444 case NL80211_IFTYPE_P2P_CLIENT:
1445 case NL80211_IFTYPE_P2P_GO:
1446 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1447 list_for_each_entry(sdata, &local->interfaces, list) {
1448 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1449 continue;
1450 if (!ieee80211_sdata_running(sdata))
1451 continue;
1452 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1453 goto out_unlock;
1454 }
1455 }
1456 /* otherwise fall through */
1457 default:
1458 /* assign a new address if possible -- try n_addresses first */
1459 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1460 bool used = false;
1461
1462 list_for_each_entry(sdata, &local->interfaces, list) {
1463 if (memcmp(local->hw.wiphy->addresses[i].addr,
1464 sdata->vif.addr, ETH_ALEN) == 0) {
1465 used = true;
1466 break;
1467 }
1468 }
1469
1470 if (!used) {
1471 memcpy(perm_addr,
1472 local->hw.wiphy->addresses[i].addr,
1473 ETH_ALEN);
1474 break;
1475 }
1476 }
1477
1478 /* try mask if available */
1479 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1480 break;
1481
1482 m = local->hw.wiphy->addr_mask;
1483 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1484 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1485 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1486
1487 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1488 /* not a contiguous mask ... not handled now! */
1489 pr_info("not contiguous\n");
1490 break;
1491 }
1492
1493 /*
1494 * Pick address of existing interface in case user changed
1495 * MAC address manually, default to perm_addr.
1496 */
1497 m = local->hw.wiphy->perm_addr;
1498 list_for_each_entry(sdata, &local->interfaces, list) {
1499 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1500 continue;
1501 m = sdata->vif.addr;
1502 break;
1503 }
1504 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1505 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1506 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1507
1508 inc = 1ULL<<__ffs64(mask);
1509 val = (start & mask);
1510 addr = (start & ~mask) | (val & mask);
1511 do {
1512 bool used = false;
1513
1514 tmp_addr[5] = addr >> 0*8;
1515 tmp_addr[4] = addr >> 1*8;
1516 tmp_addr[3] = addr >> 2*8;
1517 tmp_addr[2] = addr >> 3*8;
1518 tmp_addr[1] = addr >> 4*8;
1519 tmp_addr[0] = addr >> 5*8;
1520
1521 val += inc;
1522
1523 list_for_each_entry(sdata, &local->interfaces, list) {
1524 if (memcmp(tmp_addr, sdata->vif.addr,
1525 ETH_ALEN) == 0) {
1526 used = true;
1527 break;
1528 }
1529 }
1530
1531 if (!used) {
1532 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1533 break;
1534 }
1535 addr = (start & ~mask) | (val & mask);
1536 } while (addr != start);
1537
1538 break;
1539 }
1540
1541 out_unlock:
1542 mutex_unlock(&local->iflist_mtx);
1543 }
1544
1545 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1546 {
1547 struct ieee80211_sub_if_data *sdata;
1548
1549 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1550
1551 ieee80211_cleanup_sdata_stas(sdata);
1552 }
1553
1554 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1555 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1556 struct vif_params *params)
1557 {
1558 struct net_device *ndev = NULL;
1559 struct ieee80211_sub_if_data *sdata = NULL;
1560 int ret, i;
1561 int txqs = 1;
1562
1563 ASSERT_RTNL();
1564
1565 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1566 struct wireless_dev *wdev;
1567
1568 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1569 GFP_KERNEL);
1570 if (!sdata)
1571 return -ENOMEM;
1572 wdev = &sdata->wdev;
1573
1574 sdata->dev = NULL;
1575 strlcpy(sdata->name, name, IFNAMSIZ);
1576 ieee80211_assign_perm_addr(local, wdev->address, type);
1577 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1578 } else {
1579 if (local->hw.queues >= IEEE80211_NUM_ACS)
1580 txqs = IEEE80211_NUM_ACS;
1581
1582 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1583 local->hw.vif_data_size,
1584 name, ieee80211_if_setup, txqs, 1);
1585 if (!ndev)
1586 return -ENOMEM;
1587 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1588
1589 ndev->needed_headroom = local->tx_headroom +
1590 4*6 /* four MAC addresses */
1591 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1592 + 6 /* mesh */
1593 + 8 /* rfc1042/bridge tunnel */
1594 - ETH_HLEN /* ethernet hard_header_len */
1595 + IEEE80211_ENCRYPT_HEADROOM;
1596 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1597
1598 ret = dev_alloc_name(ndev, ndev->name);
1599 if (ret < 0) {
1600 free_netdev(ndev);
1601 return ret;
1602 }
1603
1604 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1605 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1606 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1607
1608 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1609 sdata = netdev_priv(ndev);
1610 ndev->ieee80211_ptr = &sdata->wdev;
1611 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1612 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1613
1614 sdata->dev = ndev;
1615 }
1616
1617 /* initialise type-independent data */
1618 sdata->wdev.wiphy = local->hw.wiphy;
1619 sdata->local = local;
1620
1621 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1622 skb_queue_head_init(&sdata->fragments[i].skb_list);
1623
1624 INIT_LIST_HEAD(&sdata->key_list);
1625
1626 spin_lock_init(&sdata->cleanup_stations_lock);
1627 INIT_LIST_HEAD(&sdata->cleanup_stations);
1628 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1629 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1630 ieee80211_dfs_cac_timer_work);
1631 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1632 ieee80211_delayed_tailroom_dec);
1633
1634 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1635 struct ieee80211_supported_band *sband;
1636 sband = local->hw.wiphy->bands[i];
1637 sdata->rc_rateidx_mask[i] =
1638 sband ? (1 << sband->n_bitrates) - 1 : 0;
1639 if (sband)
1640 memcpy(sdata->rc_rateidx_mcs_mask[i],
1641 sband->ht_cap.mcs.rx_mask,
1642 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1643 else
1644 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1645 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1646 }
1647
1648 ieee80211_set_default_queues(sdata);
1649
1650 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1651 sdata->user_power_level = local->user_power_level;
1652
1653 /* setup type-dependent data */
1654 ieee80211_setup_sdata(sdata, type);
1655
1656 if (ndev) {
1657 if (params) {
1658 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1659 if (type == NL80211_IFTYPE_STATION)
1660 sdata->u.mgd.use_4addr = params->use_4addr;
1661 }
1662
1663 ndev->features |= local->hw.netdev_features;
1664
1665 ret = register_netdevice(ndev);
1666 if (ret) {
1667 free_netdev(ndev);
1668 return ret;
1669 }
1670 }
1671
1672 mutex_lock(&local->iflist_mtx);
1673 list_add_tail_rcu(&sdata->list, &local->interfaces);
1674 mutex_unlock(&local->iflist_mtx);
1675
1676 if (new_wdev)
1677 *new_wdev = &sdata->wdev;
1678
1679 return 0;
1680 }
1681
1682 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1683 {
1684 ASSERT_RTNL();
1685
1686 mutex_lock(&sdata->local->iflist_mtx);
1687 list_del_rcu(&sdata->list);
1688 mutex_unlock(&sdata->local->iflist_mtx);
1689
1690 synchronize_rcu();
1691
1692 if (sdata->dev) {
1693 unregister_netdevice(sdata->dev);
1694 } else {
1695 cfg80211_unregister_wdev(&sdata->wdev);
1696 kfree(sdata);
1697 }
1698 }
1699
1700 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1701 {
1702 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1703 return;
1704 ieee80211_do_stop(sdata, true);
1705 ieee80211_teardown_sdata(sdata);
1706 }
1707
1708 /*
1709 * Remove all interfaces, may only be called at hardware unregistration
1710 * time because it doesn't do RCU-safe list removals.
1711 */
1712 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1713 {
1714 struct ieee80211_sub_if_data *sdata, *tmp;
1715 LIST_HEAD(unreg_list);
1716 LIST_HEAD(wdev_list);
1717
1718 ASSERT_RTNL();
1719
1720 /*
1721 * Close all AP_VLAN interfaces first, as otherwise they
1722 * might be closed while the AP interface they belong to
1723 * is closed, causing unregister_netdevice_many() to crash.
1724 */
1725 list_for_each_entry(sdata, &local->interfaces, list)
1726 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1727 dev_close(sdata->dev);
1728
1729 mutex_lock(&local->iflist_mtx);
1730 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1731 list_del(&sdata->list);
1732
1733 if (sdata->dev)
1734 unregister_netdevice_queue(sdata->dev, &unreg_list);
1735 else
1736 list_add(&sdata->list, &wdev_list);
1737 }
1738 mutex_unlock(&local->iflist_mtx);
1739 unregister_netdevice_many(&unreg_list);
1740 list_del(&unreg_list);
1741
1742 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1743 list_del(&sdata->list);
1744 cfg80211_unregister_wdev(&sdata->wdev);
1745 kfree(sdata);
1746 }
1747 }
1748
1749 static int netdev_notify(struct notifier_block *nb,
1750 unsigned long state,
1751 void *ndev)
1752 {
1753 struct net_device *dev = ndev;
1754 struct ieee80211_sub_if_data *sdata;
1755
1756 if (state != NETDEV_CHANGENAME)
1757 return 0;
1758
1759 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1760 return 0;
1761
1762 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1763 return 0;
1764
1765 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1766
1767 memcpy(sdata->name, dev->name, IFNAMSIZ);
1768
1769 ieee80211_debugfs_rename_netdev(sdata);
1770 return 0;
1771 }
1772
1773 static struct notifier_block mac80211_netdev_notifier = {
1774 .notifier_call = netdev_notify,
1775 };
1776
1777 int ieee80211_iface_init(void)
1778 {
1779 return register_netdevice_notifier(&mac80211_netdev_notifier);
1780 }
1781
1782 void ieee80211_iface_exit(void)
1783 {
1784 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1785 }
kernel source for telekom puls (alcatel/mediatek)