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Merge remote-tracking branch 'asoc/fix/blackfin' into asoc-linus
[mirror_ubuntu-artful-kernel.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 = ieee80211_chandef_max_power(&chanctx_conf->def);
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 bool check_dup)
164 {
165 struct ieee80211_local *local = sdata->local;
166 struct ieee80211_sub_if_data *iter;
167 u64 new, mask, tmp;
168 u8 *m;
169 int ret = 0;
170
171 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172 return 0;
173
174 m = addr;
175 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178
179 m = local->hw.wiphy->addr_mask;
180 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183
184 if (!check_dup)
185 return ret;
186
187 mutex_lock(&local->iflist_mtx);
188 list_for_each_entry(iter, &local->interfaces, list) {
189 if (iter == sdata)
190 continue;
191
192 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
194 continue;
195
196 m = iter->vif.addr;
197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200
201 if ((new & ~mask) != (tmp & ~mask)) {
202 ret = -EINVAL;
203 break;
204 }
205 }
206 mutex_unlock(&local->iflist_mtx);
207
208 return ret;
209 }
210
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214 struct sockaddr *sa = addr;
215 bool check_dup = true;
216 int ret;
217
218 if (ieee80211_sdata_running(sdata))
219 return -EBUSY;
220
221 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
223 check_dup = false;
224
225 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226 if (ret)
227 return ret;
228
229 ret = eth_mac_addr(dev, sa);
230
231 if (ret == 0)
232 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233
234 return ret;
235 }
236
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239 return type1 == NL80211_IFTYPE_MONITOR ||
240 type2 == NL80211_IFTYPE_MONITOR ||
241 type1 == NL80211_IFTYPE_P2P_DEVICE ||
242 type2 == NL80211_IFTYPE_P2P_DEVICE ||
243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244 (type1 == NL80211_IFTYPE_WDS &&
245 (type2 == NL80211_IFTYPE_WDS ||
246 type2 == NL80211_IFTYPE_AP)) ||
247 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248 (type1 == NL80211_IFTYPE_AP_VLAN &&
249 (type2 == NL80211_IFTYPE_AP ||
250 type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254 enum nl80211_iftype iftype)
255 {
256 struct ieee80211_local *local = sdata->local;
257 struct ieee80211_sub_if_data *nsdata;
258
259 ASSERT_RTNL();
260
261 /* we hold the RTNL here so can safely walk the list */
262 list_for_each_entry(nsdata, &local->interfaces, list) {
263 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
264 /*
265 * Allow only a single IBSS interface to be up at any
266 * time. This is restricted because beacon distribution
267 * cannot work properly if both are in the same IBSS.
268 *
269 * To remove this restriction we'd have to disallow them
270 * from setting the same SSID on different IBSS interfaces
271 * belonging to the same hardware. Then, however, we're
272 * faced with having to adopt two different TSF timers...
273 */
274 if (iftype == NL80211_IFTYPE_ADHOC &&
275 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276 return -EBUSY;
277 /*
278 * will not add another interface while any channel
279 * switch is active.
280 */
281 if (nsdata->vif.csa_active)
282 return -EBUSY;
283
284 /*
285 * The remaining checks are only performed for interfaces
286 * with the same MAC address.
287 */
288 if (!ether_addr_equal(sdata->vif.addr,
289 nsdata->vif.addr))
290 continue;
291
292 /*
293 * check whether it may have the same address
294 */
295 if (!identical_mac_addr_allowed(iftype,
296 nsdata->vif.type))
297 return -ENOTUNIQ;
298
299 /*
300 * can only add VLANs to enabled APs
301 */
302 if (iftype == NL80211_IFTYPE_AP_VLAN &&
303 nsdata->vif.type == NL80211_IFTYPE_AP)
304 sdata->bss = &nsdata->u.ap;
305 }
306 }
307
308 return 0;
309 }
310
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 enum nl80211_iftype iftype)
313 {
314 int n_queues = sdata->local->hw.queues;
315 int i;
316
317 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
318 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320 IEEE80211_INVAL_HW_QUEUE))
321 return -EINVAL;
322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323 n_queues))
324 return -EINVAL;
325 }
326 }
327
328 if ((iftype != NL80211_IFTYPE_AP &&
329 iftype != NL80211_IFTYPE_P2P_GO &&
330 iftype != NL80211_IFTYPE_MESH_POINT) ||
331 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333 return 0;
334 }
335
336 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337 return -EINVAL;
338
339 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340 return -EINVAL;
341
342 return 0;
343 }
344
345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346 const int offset)
347 {
348 struct ieee80211_local *local = sdata->local;
349 u32 flags = sdata->u.mntr_flags;
350
351 #define ADJUST(_f, _s) do { \
352 if (flags & MONITOR_FLAG_##_f) \
353 local->fif_##_s += offset; \
354 } while (0)
355
356 ADJUST(FCSFAIL, fcsfail);
357 ADJUST(PLCPFAIL, plcpfail);
358 ADJUST(CONTROL, control);
359 ADJUST(CONTROL, pspoll);
360 ADJUST(OTHER_BSS, other_bss);
361
362 #undef ADJUST
363 }
364
365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367 struct ieee80211_local *local = sdata->local;
368 int i;
369
370 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373 else if (local->hw.queues >= IEEE80211_NUM_ACS)
374 sdata->vif.hw_queue[i] = i;
375 else
376 sdata->vif.hw_queue[i] = 0;
377 }
378 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380
381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383 struct ieee80211_sub_if_data *sdata;
384 int ret;
385
386 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387 return 0;
388
389 ASSERT_RTNL();
390
391 if (local->monitor_sdata)
392 return 0;
393
394 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395 if (!sdata)
396 return -ENOMEM;
397
398 /* set up data */
399 sdata->local = local;
400 sdata->vif.type = NL80211_IFTYPE_MONITOR;
401 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402 wiphy_name(local->hw.wiphy));
403
404 ieee80211_set_default_queues(sdata);
405
406 ret = drv_add_interface(local, sdata);
407 if (WARN_ON(ret)) {
408 /* ok .. stupid driver, it asked for this! */
409 kfree(sdata);
410 return ret;
411 }
412
413 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
414 if (ret) {
415 kfree(sdata);
416 return ret;
417 }
418
419 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
420 IEEE80211_CHANCTX_EXCLUSIVE);
421 if (ret) {
422 drv_remove_interface(local, sdata);
423 kfree(sdata);
424 return ret;
425 }
426
427 mutex_lock(&local->iflist_mtx);
428 rcu_assign_pointer(local->monitor_sdata, sdata);
429 mutex_unlock(&local->iflist_mtx);
430
431 return 0;
432 }
433
434 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
435 {
436 struct ieee80211_sub_if_data *sdata;
437
438 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
439 return;
440
441 ASSERT_RTNL();
442
443 mutex_lock(&local->iflist_mtx);
444
445 sdata = rcu_dereference_protected(local->monitor_sdata,
446 lockdep_is_held(&local->iflist_mtx));
447 if (!sdata) {
448 mutex_unlock(&local->iflist_mtx);
449 return;
450 }
451
452 rcu_assign_pointer(local->monitor_sdata, NULL);
453 mutex_unlock(&local->iflist_mtx);
454
455 synchronize_net();
456
457 ieee80211_vif_release_channel(sdata);
458
459 drv_remove_interface(local, sdata);
460
461 kfree(sdata);
462 }
463
464 /*
465 * NOTE: Be very careful when changing this function, it must NOT return
466 * an error on interface type changes that have been pre-checked, so most
467 * checks should be in ieee80211_check_concurrent_iface.
468 */
469 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
470 {
471 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
472 struct net_device *dev = wdev->netdev;
473 struct ieee80211_local *local = sdata->local;
474 struct sta_info *sta;
475 u32 changed = 0;
476 int res;
477 u32 hw_reconf_flags = 0;
478
479 switch (sdata->vif.type) {
480 case NL80211_IFTYPE_WDS:
481 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
482 return -ENOLINK;
483 break;
484 case NL80211_IFTYPE_AP_VLAN: {
485 struct ieee80211_sub_if_data *master;
486
487 if (!sdata->bss)
488 return -ENOLINK;
489
490 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
491
492 master = container_of(sdata->bss,
493 struct ieee80211_sub_if_data, u.ap);
494 sdata->control_port_protocol =
495 master->control_port_protocol;
496 sdata->control_port_no_encrypt =
497 master->control_port_no_encrypt;
498 sdata->vif.cab_queue = master->vif.cab_queue;
499 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
500 sizeof(sdata->vif.hw_queue));
501 break;
502 }
503 case NL80211_IFTYPE_AP:
504 sdata->bss = &sdata->u.ap;
505 break;
506 case NL80211_IFTYPE_MESH_POINT:
507 case NL80211_IFTYPE_STATION:
508 case NL80211_IFTYPE_MONITOR:
509 case NL80211_IFTYPE_ADHOC:
510 case NL80211_IFTYPE_P2P_DEVICE:
511 /* no special treatment */
512 break;
513 case NL80211_IFTYPE_UNSPECIFIED:
514 case NUM_NL80211_IFTYPES:
515 case NL80211_IFTYPE_P2P_CLIENT:
516 case NL80211_IFTYPE_P2P_GO:
517 /* cannot happen */
518 WARN_ON(1);
519 break;
520 }
521
522 if (local->open_count == 0) {
523 res = drv_start(local);
524 if (res)
525 goto err_del_bss;
526 /* we're brought up, everything changes */
527 hw_reconf_flags = ~0;
528 ieee80211_led_radio(local, true);
529 ieee80211_mod_tpt_led_trig(local,
530 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
531 }
532
533 /*
534 * Copy the hopefully now-present MAC address to
535 * this interface, if it has the special null one.
536 */
537 if (dev && is_zero_ether_addr(dev->dev_addr)) {
538 memcpy(dev->dev_addr,
539 local->hw.wiphy->perm_addr,
540 ETH_ALEN);
541 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
542
543 if (!is_valid_ether_addr(dev->dev_addr)) {
544 res = -EADDRNOTAVAIL;
545 goto err_stop;
546 }
547 }
548
549 switch (sdata->vif.type) {
550 case NL80211_IFTYPE_AP_VLAN:
551 /* no need to tell driver, but set carrier and chanctx */
552 if (rtnl_dereference(sdata->bss->beacon)) {
553 ieee80211_vif_vlan_copy_chanctx(sdata);
554 netif_carrier_on(dev);
555 } else {
556 netif_carrier_off(dev);
557 }
558 break;
559 case NL80211_IFTYPE_MONITOR:
560 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
561 local->cooked_mntrs++;
562 break;
563 }
564
565 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
566 res = drv_add_interface(local, sdata);
567 if (res)
568 goto err_stop;
569 } else if (local->monitors == 0 && local->open_count == 0) {
570 res = ieee80211_add_virtual_monitor(local);
571 if (res)
572 goto err_stop;
573 }
574
575 /* must be before the call to ieee80211_configure_filter */
576 local->monitors++;
577 if (local->monitors == 1) {
578 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
579 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
580 }
581
582 ieee80211_adjust_monitor_flags(sdata, 1);
583 ieee80211_configure_filter(local);
584 mutex_lock(&local->mtx);
585 ieee80211_recalc_idle(local);
586 mutex_unlock(&local->mtx);
587
588 netif_carrier_on(dev);
589 break;
590 default:
591 if (coming_up) {
592 ieee80211_del_virtual_monitor(local);
593
594 res = drv_add_interface(local, sdata);
595 if (res)
596 goto err_stop;
597 res = ieee80211_check_queues(sdata,
598 ieee80211_vif_type_p2p(&sdata->vif));
599 if (res)
600 goto err_del_interface;
601 }
602
603 if (sdata->vif.type == NL80211_IFTYPE_AP) {
604 local->fif_pspoll++;
605 local->fif_probe_req++;
606
607 ieee80211_configure_filter(local);
608 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
609 local->fif_probe_req++;
610 }
611
612 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
613 changed |= ieee80211_reset_erp_info(sdata);
614 ieee80211_bss_info_change_notify(sdata, changed);
615
616 switch (sdata->vif.type) {
617 case NL80211_IFTYPE_STATION:
618 case NL80211_IFTYPE_ADHOC:
619 case NL80211_IFTYPE_AP:
620 case NL80211_IFTYPE_MESH_POINT:
621 netif_carrier_off(dev);
622 break;
623 case NL80211_IFTYPE_WDS:
624 case NL80211_IFTYPE_P2P_DEVICE:
625 break;
626 default:
627 /* not reached */
628 WARN_ON(1);
629 }
630
631 /*
632 * set default queue parameters so drivers don't
633 * need to initialise the hardware if the hardware
634 * doesn't start up with sane defaults
635 */
636 ieee80211_set_wmm_default(sdata, true);
637 }
638
639 set_bit(SDATA_STATE_RUNNING, &sdata->state);
640
641 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
642 /* Create STA entry for the WDS peer */
643 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
644 GFP_KERNEL);
645 if (!sta) {
646 res = -ENOMEM;
647 goto err_del_interface;
648 }
649
650 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
651 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
652 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
653
654 res = sta_info_insert(sta);
655 if (res) {
656 /* STA has been freed */
657 goto err_del_interface;
658 }
659
660 rate_control_rate_init(sta);
661 netif_carrier_on(dev);
662 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
663 rcu_assign_pointer(local->p2p_sdata, sdata);
664 }
665
666 /*
667 * set_multicast_list will be invoked by the networking core
668 * which will check whether any increments here were done in
669 * error and sync them down to the hardware as filter flags.
670 */
671 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
672 atomic_inc(&local->iff_allmultis);
673
674 if (sdata->flags & IEEE80211_SDATA_PROMISC)
675 atomic_inc(&local->iff_promiscs);
676
677 if (coming_up)
678 local->open_count++;
679
680 if (hw_reconf_flags)
681 ieee80211_hw_config(local, hw_reconf_flags);
682
683 ieee80211_recalc_ps(local, -1);
684
685 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
687 /* XXX: for AP_VLAN, actually track AP queues */
688 netif_tx_start_all_queues(dev);
689 } else if (dev) {
690 unsigned long flags;
691 int n_acs = IEEE80211_NUM_ACS;
692 int ac;
693
694 if (local->hw.queues < IEEE80211_NUM_ACS)
695 n_acs = 1;
696
697 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
698 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
699 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
700 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
701 for (ac = 0; ac < n_acs; ac++) {
702 int ac_queue = sdata->vif.hw_queue[ac];
703
704 if (local->queue_stop_reasons[ac_queue] == 0 &&
705 skb_queue_empty(&local->pending[ac_queue]))
706 netif_start_subqueue(dev, ac);
707 }
708 }
709 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
710 }
711
712 return 0;
713 err_del_interface:
714 drv_remove_interface(local, sdata);
715 err_stop:
716 if (!local->open_count)
717 drv_stop(local);
718 err_del_bss:
719 sdata->bss = NULL;
720 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
721 list_del(&sdata->u.vlan.list);
722 /* might already be clear but that doesn't matter */
723 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
724 return res;
725 }
726
727 static int ieee80211_open(struct net_device *dev)
728 {
729 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
730 int err;
731
732 /* fail early if user set an invalid address */
733 if (!is_valid_ether_addr(dev->dev_addr))
734 return -EADDRNOTAVAIL;
735
736 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
737 if (err)
738 return err;
739
740 return ieee80211_do_open(&sdata->wdev, true);
741 }
742
743 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
744 bool going_down)
745 {
746 struct ieee80211_local *local = sdata->local;
747 unsigned long flags;
748 struct sk_buff *skb, *tmp;
749 u32 hw_reconf_flags = 0;
750 int i, flushed;
751 struct ps_data *ps;
752
753 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
754
755 if (rcu_access_pointer(local->scan_sdata) == sdata)
756 ieee80211_scan_cancel(local);
757
758 /*
759 * Stop TX on this interface first.
760 */
761 if (sdata->dev)
762 netif_tx_stop_all_queues(sdata->dev);
763
764 ieee80211_roc_purge(local, sdata);
765
766 if (sdata->vif.type == NL80211_IFTYPE_STATION)
767 ieee80211_mgd_stop(sdata);
768
769 /*
770 * Remove all stations associated with this interface.
771 *
772 * This must be done before calling ops->remove_interface()
773 * because otherwise we can later invoke ops->sta_notify()
774 * whenever the STAs are removed, and that invalidates driver
775 * assumptions about always getting a vif pointer that is valid
776 * (because if we remove a STA after ops->remove_interface()
777 * the driver will have removed the vif info already!)
778 *
779 * This is relevant only in WDS mode, in all other modes we've
780 * already removed all stations when disconnecting or similar,
781 * so warn otherwise.
782 *
783 * We call sta_info_flush_cleanup() later, to combine RCU waits.
784 */
785 flushed = sta_info_flush_defer(sdata);
786 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
787 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
788
789 /* don't count this interface for promisc/allmulti while it is down */
790 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
791 atomic_dec(&local->iff_allmultis);
792
793 if (sdata->flags & IEEE80211_SDATA_PROMISC)
794 atomic_dec(&local->iff_promiscs);
795
796 if (sdata->vif.type == NL80211_IFTYPE_AP) {
797 local->fif_pspoll--;
798 local->fif_probe_req--;
799 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
800 local->fif_probe_req--;
801 }
802
803 if (sdata->dev) {
804 netif_addr_lock_bh(sdata->dev);
805 spin_lock_bh(&local->filter_lock);
806 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
807 sdata->dev->addr_len);
808 spin_unlock_bh(&local->filter_lock);
809 netif_addr_unlock_bh(sdata->dev);
810 }
811
812 del_timer_sync(&local->dynamic_ps_timer);
813 cancel_work_sync(&local->dynamic_ps_enable_work);
814
815 cancel_work_sync(&sdata->recalc_smps);
816 sdata->vif.csa_active = false;
817 cancel_work_sync(&sdata->csa_finalize_work);
818
819 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
820
821 if (sdata->wdev.cac_started) {
822 WARN_ON(local->suspended);
823 mutex_lock(&local->iflist_mtx);
824 ieee80211_vif_release_channel(sdata);
825 mutex_unlock(&local->iflist_mtx);
826 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
827 GFP_KERNEL);
828 }
829
830 /* APs need special treatment */
831 if (sdata->vif.type == NL80211_IFTYPE_AP) {
832 struct ieee80211_sub_if_data *vlan, *tmpsdata;
833
834 /* down all dependent devices, that is VLANs */
835 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
836 u.vlan.list)
837 dev_close(vlan->dev);
838 WARN_ON(!list_empty(&sdata->u.ap.vlans));
839 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
840 /* remove all packets in parent bc_buf pointing to this dev */
841 ps = &sdata->bss->ps;
842
843 spin_lock_irqsave(&ps->bc_buf.lock, flags);
844 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
845 if (skb->dev == sdata->dev) {
846 __skb_unlink(skb, &ps->bc_buf);
847 local->total_ps_buffered--;
848 ieee80211_free_txskb(&local->hw, skb);
849 }
850 }
851 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
852 }
853
854 if (going_down)
855 local->open_count--;
856
857 switch (sdata->vif.type) {
858 case NL80211_IFTYPE_AP_VLAN:
859 list_del(&sdata->u.vlan.list);
860 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
861 /* no need to tell driver */
862 break;
863 case NL80211_IFTYPE_MONITOR:
864 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
865 local->cooked_mntrs--;
866 break;
867 }
868
869 local->monitors--;
870 if (local->monitors == 0) {
871 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
872 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
873 }
874
875 ieee80211_adjust_monitor_flags(sdata, -1);
876 break;
877 case NL80211_IFTYPE_P2P_DEVICE:
878 /* relies on synchronize_rcu() below */
879 rcu_assign_pointer(local->p2p_sdata, NULL);
880 /* fall through */
881 default:
882 cancel_work_sync(&sdata->work);
883 /*
884 * When we get here, the interface is marked down.
885 *
886 * sta_info_flush_cleanup() requires rcu_barrier()
887 * first to wait for the station call_rcu() calls
888 * to complete, and we also need synchronize_rcu()
889 * to wait for the RX path in case it is using the
890 * interface and enqueuing frames at this very time on
891 * another CPU.
892 */
893 synchronize_rcu();
894 rcu_barrier();
895 sta_info_flush_cleanup(sdata);
896
897 /*
898 * Free all remaining keys, there shouldn't be any,
899 * except maybe in WDS mode?
900 */
901 ieee80211_free_keys(sdata);
902
903 /* fall through */
904 case NL80211_IFTYPE_AP:
905 skb_queue_purge(&sdata->skb_queue);
906 }
907
908 sdata->bss = NULL;
909
910 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
911 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
912 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
913 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
914 if (info->control.vif == &sdata->vif) {
915 __skb_unlink(skb, &local->pending[i]);
916 ieee80211_free_txskb(&local->hw, skb);
917 }
918 }
919 }
920 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
921
922 if (local->open_count == 0)
923 ieee80211_clear_tx_pending(local);
924
925 /*
926 * If the interface goes down while suspended, presumably because
927 * the device was unplugged and that happens before our resume,
928 * then the driver is already unconfigured and the remainder of
929 * this function isn't needed.
930 * XXX: what about WoWLAN? If the device has software state, e.g.
931 * memory allocated, it might expect teardown commands from
932 * mac80211 here?
933 */
934 if (local->suspended) {
935 WARN_ON(local->wowlan);
936 WARN_ON(rtnl_dereference(local->monitor_sdata));
937 return;
938 }
939
940 switch (sdata->vif.type) {
941 case NL80211_IFTYPE_AP_VLAN:
942 break;
943 case NL80211_IFTYPE_MONITOR:
944 if (local->monitors == 0)
945 ieee80211_del_virtual_monitor(local);
946
947 mutex_lock(&local->mtx);
948 ieee80211_recalc_idle(local);
949 mutex_unlock(&local->mtx);
950
951 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
952 break;
953
954 /* fall through */
955 default:
956 if (going_down)
957 drv_remove_interface(local, sdata);
958 }
959
960 ieee80211_recalc_ps(local, -1);
961
962 if (local->open_count == 0) {
963 ieee80211_stop_device(local);
964
965 /* no reconfiguring after stop! */
966 return;
967 }
968
969 /* do after stop to avoid reconfiguring when we stop anyway */
970 ieee80211_configure_filter(local);
971 ieee80211_hw_config(local, hw_reconf_flags);
972
973 if (local->monitors == local->open_count)
974 ieee80211_add_virtual_monitor(local);
975 }
976
977 static int ieee80211_stop(struct net_device *dev)
978 {
979 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
980
981 ieee80211_do_stop(sdata, true);
982
983 return 0;
984 }
985
986 static void ieee80211_set_multicast_list(struct net_device *dev)
987 {
988 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
989 struct ieee80211_local *local = sdata->local;
990 int allmulti, promisc, sdata_allmulti, sdata_promisc;
991
992 allmulti = !!(dev->flags & IFF_ALLMULTI);
993 promisc = !!(dev->flags & IFF_PROMISC);
994 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
995 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
996
997 if (allmulti != sdata_allmulti) {
998 if (dev->flags & IFF_ALLMULTI)
999 atomic_inc(&local->iff_allmultis);
1000 else
1001 atomic_dec(&local->iff_allmultis);
1002 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1003 }
1004
1005 if (promisc != sdata_promisc) {
1006 if (dev->flags & IFF_PROMISC)
1007 atomic_inc(&local->iff_promiscs);
1008 else
1009 atomic_dec(&local->iff_promiscs);
1010 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1011 }
1012
1013 /*
1014 * TODO: If somebody needs this on AP interfaces,
1015 * it can be enabled easily but multicast
1016 * addresses from VLANs need to be synced.
1017 */
1018 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1019 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1020 sdata->vif.type != NL80211_IFTYPE_AP)
1021 drv_set_multicast_list(local, sdata, &dev->mc);
1022
1023 spin_lock_bh(&local->filter_lock);
1024 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1025 spin_unlock_bh(&local->filter_lock);
1026 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1027 }
1028
1029 /*
1030 * Called when the netdev is removed or, by the code below, before
1031 * the interface type changes.
1032 */
1033 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1034 {
1035 int flushed;
1036 int i;
1037
1038 /* free extra data */
1039 ieee80211_free_keys(sdata);
1040
1041 ieee80211_debugfs_remove_netdev(sdata);
1042
1043 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1044 __skb_queue_purge(&sdata->fragments[i].skb_list);
1045 sdata->fragment_next = 0;
1046
1047 if (ieee80211_vif_is_mesh(&sdata->vif))
1048 mesh_rmc_free(sdata);
1049
1050 flushed = sta_info_flush(sdata);
1051 WARN_ON(flushed);
1052 }
1053
1054 static void ieee80211_uninit(struct net_device *dev)
1055 {
1056 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1057 }
1058
1059 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1060 struct sk_buff *skb)
1061 {
1062 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1063 }
1064
1065 static const struct net_device_ops ieee80211_dataif_ops = {
1066 .ndo_open = ieee80211_open,
1067 .ndo_stop = ieee80211_stop,
1068 .ndo_uninit = ieee80211_uninit,
1069 .ndo_start_xmit = ieee80211_subif_start_xmit,
1070 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1071 .ndo_change_mtu = ieee80211_change_mtu,
1072 .ndo_set_mac_address = ieee80211_change_mac,
1073 .ndo_select_queue = ieee80211_netdev_select_queue,
1074 };
1075
1076 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1077 struct sk_buff *skb)
1078 {
1079 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080 struct ieee80211_local *local = sdata->local;
1081 struct ieee80211_hdr *hdr;
1082 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1083
1084 if (local->hw.queues < IEEE80211_NUM_ACS)
1085 return 0;
1086
1087 if (skb->len < 4 ||
1088 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1089 return 0; /* doesn't matter, frame will be dropped */
1090
1091 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1092
1093 return ieee80211_select_queue_80211(sdata, skb, hdr);
1094 }
1095
1096 static const struct net_device_ops ieee80211_monitorif_ops = {
1097 .ndo_open = ieee80211_open,
1098 .ndo_stop = ieee80211_stop,
1099 .ndo_uninit = ieee80211_uninit,
1100 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1101 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1102 .ndo_change_mtu = ieee80211_change_mtu,
1103 .ndo_set_mac_address = ieee80211_change_mac,
1104 .ndo_select_queue = ieee80211_monitor_select_queue,
1105 };
1106
1107 static void ieee80211_if_setup(struct net_device *dev)
1108 {
1109 ether_setup(dev);
1110 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1111 dev->netdev_ops = &ieee80211_dataif_ops;
1112 dev->destructor = free_netdev;
1113 }
1114
1115 static void ieee80211_iface_work(struct work_struct *work)
1116 {
1117 struct ieee80211_sub_if_data *sdata =
1118 container_of(work, struct ieee80211_sub_if_data, work);
1119 struct ieee80211_local *local = sdata->local;
1120 struct sk_buff *skb;
1121 struct sta_info *sta;
1122 struct ieee80211_ra_tid *ra_tid;
1123
1124 if (!ieee80211_sdata_running(sdata))
1125 return;
1126
1127 if (local->scanning)
1128 return;
1129
1130 /*
1131 * ieee80211_queue_work() should have picked up most cases,
1132 * here we'll pick the rest.
1133 */
1134 if (WARN(local->suspended,
1135 "interface work scheduled while going to suspend\n"))
1136 return;
1137
1138 /* first process frames */
1139 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1140 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1141
1142 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1143 ra_tid = (void *)&skb->cb;
1144 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1145 ra_tid->tid);
1146 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1147 ra_tid = (void *)&skb->cb;
1148 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1149 ra_tid->tid);
1150 } else if (ieee80211_is_action(mgmt->frame_control) &&
1151 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1152 int len = skb->len;
1153
1154 mutex_lock(&local->sta_mtx);
1155 sta = sta_info_get_bss(sdata, mgmt->sa);
1156 if (sta) {
1157 switch (mgmt->u.action.u.addba_req.action_code) {
1158 case WLAN_ACTION_ADDBA_REQ:
1159 ieee80211_process_addba_request(
1160 local, sta, mgmt, len);
1161 break;
1162 case WLAN_ACTION_ADDBA_RESP:
1163 ieee80211_process_addba_resp(local, sta,
1164 mgmt, len);
1165 break;
1166 case WLAN_ACTION_DELBA:
1167 ieee80211_process_delba(sdata, sta,
1168 mgmt, len);
1169 break;
1170 default:
1171 WARN_ON(1);
1172 break;
1173 }
1174 }
1175 mutex_unlock(&local->sta_mtx);
1176 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1177 struct ieee80211_hdr *hdr = (void *)mgmt;
1178 /*
1179 * So the frame isn't mgmt, but frame_control
1180 * is at the right place anyway, of course, so
1181 * the if statement is correct.
1182 *
1183 * Warn if we have other data frame types here,
1184 * they must not get here.
1185 */
1186 WARN_ON(hdr->frame_control &
1187 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1188 WARN_ON(!(hdr->seq_ctrl &
1189 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1190 /*
1191 * This was a fragment of a frame, received while
1192 * a block-ack session was active. That cannot be
1193 * right, so terminate the session.
1194 */
1195 mutex_lock(&local->sta_mtx);
1196 sta = sta_info_get_bss(sdata, mgmt->sa);
1197 if (sta) {
1198 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1199 IEEE80211_QOS_CTL_TID_MASK;
1200
1201 __ieee80211_stop_rx_ba_session(
1202 sta, tid, WLAN_BACK_RECIPIENT,
1203 WLAN_REASON_QSTA_REQUIRE_SETUP,
1204 true);
1205 }
1206 mutex_unlock(&local->sta_mtx);
1207 } else switch (sdata->vif.type) {
1208 case NL80211_IFTYPE_STATION:
1209 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1210 break;
1211 case NL80211_IFTYPE_ADHOC:
1212 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1213 break;
1214 case NL80211_IFTYPE_MESH_POINT:
1215 if (!ieee80211_vif_is_mesh(&sdata->vif))
1216 break;
1217 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1218 break;
1219 default:
1220 WARN(1, "frame for unexpected interface type");
1221 break;
1222 }
1223
1224 kfree_skb(skb);
1225 }
1226
1227 /* then other type-dependent work */
1228 switch (sdata->vif.type) {
1229 case NL80211_IFTYPE_STATION:
1230 ieee80211_sta_work(sdata);
1231 break;
1232 case NL80211_IFTYPE_ADHOC:
1233 ieee80211_ibss_work(sdata);
1234 break;
1235 case NL80211_IFTYPE_MESH_POINT:
1236 if (!ieee80211_vif_is_mesh(&sdata->vif))
1237 break;
1238 ieee80211_mesh_work(sdata);
1239 break;
1240 default:
1241 break;
1242 }
1243 }
1244
1245 static void ieee80211_recalc_smps_work(struct work_struct *work)
1246 {
1247 struct ieee80211_sub_if_data *sdata =
1248 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1249
1250 ieee80211_recalc_smps(sdata);
1251 }
1252
1253 /*
1254 * Helper function to initialise an interface to a specific type.
1255 */
1256 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1257 enum nl80211_iftype type)
1258 {
1259 /* clear type-dependent union */
1260 memset(&sdata->u, 0, sizeof(sdata->u));
1261
1262 /* and set some type-dependent values */
1263 sdata->vif.type = type;
1264 sdata->vif.p2p = false;
1265 sdata->wdev.iftype = type;
1266
1267 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1268 sdata->control_port_no_encrypt = false;
1269
1270 sdata->noack_map = 0;
1271
1272 /* only monitor/p2p-device differ */
1273 if (sdata->dev) {
1274 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1275 sdata->dev->type = ARPHRD_ETHER;
1276 }
1277
1278 skb_queue_head_init(&sdata->skb_queue);
1279 INIT_WORK(&sdata->work, ieee80211_iface_work);
1280 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1281 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1282
1283 switch (type) {
1284 case NL80211_IFTYPE_P2P_GO:
1285 type = NL80211_IFTYPE_AP;
1286 sdata->vif.type = type;
1287 sdata->vif.p2p = true;
1288 /* fall through */
1289 case NL80211_IFTYPE_AP:
1290 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1291 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1292 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1293 break;
1294 case NL80211_IFTYPE_P2P_CLIENT:
1295 type = NL80211_IFTYPE_STATION;
1296 sdata->vif.type = type;
1297 sdata->vif.p2p = true;
1298 /* fall through */
1299 case NL80211_IFTYPE_STATION:
1300 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1301 ieee80211_sta_setup_sdata(sdata);
1302 break;
1303 case NL80211_IFTYPE_ADHOC:
1304 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1305 ieee80211_ibss_setup_sdata(sdata);
1306 break;
1307 case NL80211_IFTYPE_MESH_POINT:
1308 if (ieee80211_vif_is_mesh(&sdata->vif))
1309 ieee80211_mesh_init_sdata(sdata);
1310 break;
1311 case NL80211_IFTYPE_MONITOR:
1312 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1313 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1314 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1315 MONITOR_FLAG_OTHER_BSS;
1316 break;
1317 case NL80211_IFTYPE_WDS:
1318 sdata->vif.bss_conf.bssid = NULL;
1319 break;
1320 case NL80211_IFTYPE_AP_VLAN:
1321 break;
1322 case NL80211_IFTYPE_P2P_DEVICE:
1323 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1324 break;
1325 case NL80211_IFTYPE_UNSPECIFIED:
1326 case NUM_NL80211_IFTYPES:
1327 BUG();
1328 break;
1329 }
1330
1331 ieee80211_debugfs_add_netdev(sdata);
1332 }
1333
1334 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1335 enum nl80211_iftype type)
1336 {
1337 struct ieee80211_local *local = sdata->local;
1338 int ret, err;
1339 enum nl80211_iftype internal_type = type;
1340 bool p2p = false;
1341
1342 ASSERT_RTNL();
1343
1344 if (!local->ops->change_interface)
1345 return -EBUSY;
1346
1347 switch (sdata->vif.type) {
1348 case NL80211_IFTYPE_AP:
1349 case NL80211_IFTYPE_STATION:
1350 case NL80211_IFTYPE_ADHOC:
1351 /*
1352 * Could maybe also all others here?
1353 * Just not sure how that interacts
1354 * with the RX/config path e.g. for
1355 * mesh.
1356 */
1357 break;
1358 default:
1359 return -EBUSY;
1360 }
1361
1362 switch (type) {
1363 case NL80211_IFTYPE_AP:
1364 case NL80211_IFTYPE_STATION:
1365 case NL80211_IFTYPE_ADHOC:
1366 /*
1367 * Could probably support everything
1368 * but WDS here (WDS do_open can fail
1369 * under memory pressure, which this
1370 * code isn't prepared to handle).
1371 */
1372 break;
1373 case NL80211_IFTYPE_P2P_CLIENT:
1374 p2p = true;
1375 internal_type = NL80211_IFTYPE_STATION;
1376 break;
1377 case NL80211_IFTYPE_P2P_GO:
1378 p2p = true;
1379 internal_type = NL80211_IFTYPE_AP;
1380 break;
1381 default:
1382 return -EBUSY;
1383 }
1384
1385 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1386 if (ret)
1387 return ret;
1388
1389 ieee80211_do_stop(sdata, false);
1390
1391 ieee80211_teardown_sdata(sdata);
1392
1393 ret = drv_change_interface(local, sdata, internal_type, p2p);
1394 if (ret)
1395 type = ieee80211_vif_type_p2p(&sdata->vif);
1396
1397 /*
1398 * Ignore return value here, there's not much we can do since
1399 * the driver changed the interface type internally already.
1400 * The warnings will hopefully make driver authors fix it :-)
1401 */
1402 ieee80211_check_queues(sdata, type);
1403
1404 ieee80211_setup_sdata(sdata, type);
1405
1406 err = ieee80211_do_open(&sdata->wdev, false);
1407 WARN(err, "type change: do_open returned %d", err);
1408
1409 return ret;
1410 }
1411
1412 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1413 enum nl80211_iftype type)
1414 {
1415 int ret;
1416
1417 ASSERT_RTNL();
1418
1419 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1420 return 0;
1421
1422 if (ieee80211_sdata_running(sdata)) {
1423 ret = ieee80211_runtime_change_iftype(sdata, type);
1424 if (ret)
1425 return ret;
1426 } else {
1427 /* Purge and reset type-dependent state. */
1428 ieee80211_teardown_sdata(sdata);
1429 ieee80211_setup_sdata(sdata, type);
1430 }
1431
1432 /* reset some values that shouldn't be kept across type changes */
1433 sdata->drop_unencrypted = 0;
1434 if (type == NL80211_IFTYPE_STATION)
1435 sdata->u.mgd.use_4addr = false;
1436
1437 return 0;
1438 }
1439
1440 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1441 u8 *perm_addr, enum nl80211_iftype type)
1442 {
1443 struct ieee80211_sub_if_data *sdata;
1444 u64 mask, start, addr, val, inc;
1445 u8 *m;
1446 u8 tmp_addr[ETH_ALEN];
1447 int i;
1448
1449 /* default ... something at least */
1450 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1451
1452 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1453 local->hw.wiphy->n_addresses <= 1)
1454 return;
1455
1456 mutex_lock(&local->iflist_mtx);
1457
1458 switch (type) {
1459 case NL80211_IFTYPE_MONITOR:
1460 /* doesn't matter */
1461 break;
1462 case NL80211_IFTYPE_WDS:
1463 case NL80211_IFTYPE_AP_VLAN:
1464 /* match up with an AP interface */
1465 list_for_each_entry(sdata, &local->interfaces, list) {
1466 if (sdata->vif.type != NL80211_IFTYPE_AP)
1467 continue;
1468 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1469 break;
1470 }
1471 /* keep default if no AP interface present */
1472 break;
1473 case NL80211_IFTYPE_P2P_CLIENT:
1474 case NL80211_IFTYPE_P2P_GO:
1475 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1476 list_for_each_entry(sdata, &local->interfaces, list) {
1477 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1478 continue;
1479 if (!ieee80211_sdata_running(sdata))
1480 continue;
1481 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1482 goto out_unlock;
1483 }
1484 }
1485 /* otherwise fall through */
1486 default:
1487 /* assign a new address if possible -- try n_addresses first */
1488 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1489 bool used = false;
1490
1491 list_for_each_entry(sdata, &local->interfaces, list) {
1492 if (memcmp(local->hw.wiphy->addresses[i].addr,
1493 sdata->vif.addr, ETH_ALEN) == 0) {
1494 used = true;
1495 break;
1496 }
1497 }
1498
1499 if (!used) {
1500 memcpy(perm_addr,
1501 local->hw.wiphy->addresses[i].addr,
1502 ETH_ALEN);
1503 break;
1504 }
1505 }
1506
1507 /* try mask if available */
1508 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1509 break;
1510
1511 m = local->hw.wiphy->addr_mask;
1512 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1513 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1514 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1515
1516 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1517 /* not a contiguous mask ... not handled now! */
1518 pr_info("not contiguous\n");
1519 break;
1520 }
1521
1522 /*
1523 * Pick address of existing interface in case user changed
1524 * MAC address manually, default to perm_addr.
1525 */
1526 m = local->hw.wiphy->perm_addr;
1527 list_for_each_entry(sdata, &local->interfaces, list) {
1528 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1529 continue;
1530 m = sdata->vif.addr;
1531 break;
1532 }
1533 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1534 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1535 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1536
1537 inc = 1ULL<<__ffs64(mask);
1538 val = (start & mask);
1539 addr = (start & ~mask) | (val & mask);
1540 do {
1541 bool used = false;
1542
1543 tmp_addr[5] = addr >> 0*8;
1544 tmp_addr[4] = addr >> 1*8;
1545 tmp_addr[3] = addr >> 2*8;
1546 tmp_addr[2] = addr >> 3*8;
1547 tmp_addr[1] = addr >> 4*8;
1548 tmp_addr[0] = addr >> 5*8;
1549
1550 val += inc;
1551
1552 list_for_each_entry(sdata, &local->interfaces, list) {
1553 if (memcmp(tmp_addr, sdata->vif.addr,
1554 ETH_ALEN) == 0) {
1555 used = true;
1556 break;
1557 }
1558 }
1559
1560 if (!used) {
1561 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1562 break;
1563 }
1564 addr = (start & ~mask) | (val & mask);
1565 } while (addr != start);
1566
1567 break;
1568 }
1569
1570 out_unlock:
1571 mutex_unlock(&local->iflist_mtx);
1572 }
1573
1574 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1575 {
1576 struct ieee80211_sub_if_data *sdata;
1577
1578 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1579
1580 ieee80211_cleanup_sdata_stas(sdata);
1581 }
1582
1583 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1584 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1585 struct vif_params *params)
1586 {
1587 struct net_device *ndev = NULL;
1588 struct ieee80211_sub_if_data *sdata = NULL;
1589 int ret, i;
1590 int txqs = 1;
1591
1592 ASSERT_RTNL();
1593
1594 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1595 struct wireless_dev *wdev;
1596
1597 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1598 GFP_KERNEL);
1599 if (!sdata)
1600 return -ENOMEM;
1601 wdev = &sdata->wdev;
1602
1603 sdata->dev = NULL;
1604 strlcpy(sdata->name, name, IFNAMSIZ);
1605 ieee80211_assign_perm_addr(local, wdev->address, type);
1606 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1607 } else {
1608 if (local->hw.queues >= IEEE80211_NUM_ACS)
1609 txqs = IEEE80211_NUM_ACS;
1610
1611 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1612 local->hw.vif_data_size,
1613 name, ieee80211_if_setup, txqs, 1);
1614 if (!ndev)
1615 return -ENOMEM;
1616 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1617
1618 ndev->needed_headroom = local->tx_headroom +
1619 4*6 /* four MAC addresses */
1620 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1621 + 6 /* mesh */
1622 + 8 /* rfc1042/bridge tunnel */
1623 - ETH_HLEN /* ethernet hard_header_len */
1624 + IEEE80211_ENCRYPT_HEADROOM;
1625 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1626
1627 ret = dev_alloc_name(ndev, ndev->name);
1628 if (ret < 0) {
1629 free_netdev(ndev);
1630 return ret;
1631 }
1632
1633 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1634 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1635 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1636
1637 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1638 sdata = netdev_priv(ndev);
1639 ndev->ieee80211_ptr = &sdata->wdev;
1640 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1641 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1642
1643 sdata->dev = ndev;
1644 }
1645
1646 /* initialise type-independent data */
1647 sdata->wdev.wiphy = local->hw.wiphy;
1648 sdata->local = local;
1649
1650 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1651 skb_queue_head_init(&sdata->fragments[i].skb_list);
1652
1653 INIT_LIST_HEAD(&sdata->key_list);
1654
1655 spin_lock_init(&sdata->cleanup_stations_lock);
1656 INIT_LIST_HEAD(&sdata->cleanup_stations);
1657 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1658 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1659 ieee80211_dfs_cac_timer_work);
1660 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1661 ieee80211_delayed_tailroom_dec);
1662
1663 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1664 struct ieee80211_supported_band *sband;
1665 sband = local->hw.wiphy->bands[i];
1666 sdata->rc_rateidx_mask[i] =
1667 sband ? (1 << sband->n_bitrates) - 1 : 0;
1668 if (sband)
1669 memcpy(sdata->rc_rateidx_mcs_mask[i],
1670 sband->ht_cap.mcs.rx_mask,
1671 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1672 else
1673 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1674 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1675 }
1676
1677 ieee80211_set_default_queues(sdata);
1678
1679 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1680 sdata->user_power_level = local->user_power_level;
1681
1682 /* setup type-dependent data */
1683 ieee80211_setup_sdata(sdata, type);
1684
1685 if (ndev) {
1686 if (params) {
1687 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1688 if (type == NL80211_IFTYPE_STATION)
1689 sdata->u.mgd.use_4addr = params->use_4addr;
1690 }
1691
1692 ndev->features |= local->hw.netdev_features;
1693
1694 ret = register_netdevice(ndev);
1695 if (ret) {
1696 free_netdev(ndev);
1697 return ret;
1698 }
1699 }
1700
1701 mutex_lock(&local->iflist_mtx);
1702 list_add_tail_rcu(&sdata->list, &local->interfaces);
1703 mutex_unlock(&local->iflist_mtx);
1704
1705 if (new_wdev)
1706 *new_wdev = &sdata->wdev;
1707
1708 return 0;
1709 }
1710
1711 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1712 {
1713 ASSERT_RTNL();
1714
1715 mutex_lock(&sdata->local->iflist_mtx);
1716 list_del_rcu(&sdata->list);
1717 mutex_unlock(&sdata->local->iflist_mtx);
1718
1719 synchronize_rcu();
1720
1721 if (sdata->dev) {
1722 unregister_netdevice(sdata->dev);
1723 } else {
1724 cfg80211_unregister_wdev(&sdata->wdev);
1725 kfree(sdata);
1726 }
1727 }
1728
1729 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1730 {
1731 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1732 return;
1733 ieee80211_do_stop(sdata, true);
1734 ieee80211_teardown_sdata(sdata);
1735 }
1736
1737 /*
1738 * Remove all interfaces, may only be called at hardware unregistration
1739 * time because it doesn't do RCU-safe list removals.
1740 */
1741 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1742 {
1743 struct ieee80211_sub_if_data *sdata, *tmp;
1744 LIST_HEAD(unreg_list);
1745 LIST_HEAD(wdev_list);
1746
1747 ASSERT_RTNL();
1748
1749 /*
1750 * Close all AP_VLAN interfaces first, as otherwise they
1751 * might be closed while the AP interface they belong to
1752 * is closed, causing unregister_netdevice_many() to crash.
1753 */
1754 list_for_each_entry(sdata, &local->interfaces, list)
1755 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1756 dev_close(sdata->dev);
1757
1758 mutex_lock(&local->iflist_mtx);
1759 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1760 list_del(&sdata->list);
1761
1762 if (sdata->dev)
1763 unregister_netdevice_queue(sdata->dev, &unreg_list);
1764 else
1765 list_add(&sdata->list, &wdev_list);
1766 }
1767 mutex_unlock(&local->iflist_mtx);
1768 unregister_netdevice_many(&unreg_list);
1769 list_del(&unreg_list);
1770
1771 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1772 list_del(&sdata->list);
1773 cfg80211_unregister_wdev(&sdata->wdev);
1774 kfree(sdata);
1775 }
1776 }
1777
1778 static int netdev_notify(struct notifier_block *nb,
1779 unsigned long state, void *ptr)
1780 {
1781 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1782 struct ieee80211_sub_if_data *sdata;
1783
1784 if (state != NETDEV_CHANGENAME)
1785 return 0;
1786
1787 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1788 return 0;
1789
1790 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1791 return 0;
1792
1793 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1794
1795 memcpy(sdata->name, dev->name, IFNAMSIZ);
1796
1797 ieee80211_debugfs_rename_netdev(sdata);
1798 return 0;
1799 }
1800
1801 static struct notifier_block mac80211_netdev_notifier = {
1802 .notifier_call = netdev_notify,
1803 };
1804
1805 int ieee80211_iface_init(void)
1806 {
1807 return register_netdevice_notifier(&mac80211_netdev_notifier);
1808 }
1809
1810 void ieee80211_iface_exit(void)
1811 {
1812 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1813 }
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