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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 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (c) 2016 Intel Deutschland GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/if_arp.h>
18 #include <linux/netdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "sta_info.h"
24 #include "debugfs_netdev.h"
25 #include "mesh.h"
26 #include "led.h"
27 #include "driver-ops.h"
28 #include "wme.h"
29 #include "rate.h"
30
31 /**
32 * DOC: Interface list locking
33 *
34 * The interface list in each struct ieee80211_local is protected
35 * three-fold:
36 *
37 * (1) modifications may only be done under the RTNL
38 * (2) modifications and readers are protected against each other by
39 * the iflist_mtx.
40 * (3) modifications are done in an RCU manner so atomic readers
41 * can traverse the list in RCU-safe blocks.
42 *
43 * As a consequence, reads (traversals) of the list can be protected
44 * by either the RTNL, the iflist_mtx or RCU.
45 */
46
47 static void ieee80211_iface_work(struct work_struct *work);
48
49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
50 {
51 struct ieee80211_chanctx_conf *chanctx_conf;
52 int power;
53
54 rcu_read_lock();
55 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
56 if (!chanctx_conf) {
57 rcu_read_unlock();
58 return false;
59 }
60
61 power = ieee80211_chandef_max_power(&chanctx_conf->def);
62 rcu_read_unlock();
63
64 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
65 power = min(power, sdata->user_power_level);
66
67 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
68 power = min(power, sdata->ap_power_level);
69
70 if (power != sdata->vif.bss_conf.txpower) {
71 sdata->vif.bss_conf.txpower = power;
72 ieee80211_hw_config(sdata->local, 0);
73 return true;
74 }
75
76 return false;
77 }
78
79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
80 bool update_bss)
81 {
82 if (__ieee80211_recalc_txpower(sdata) ||
83 (update_bss && ieee80211_sdata_running(sdata)))
84 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
85 }
86
87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
88 {
89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
90 return 0;
91
92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
93 return IEEE80211_CONF_CHANGE_IDLE;
94 }
95
96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
97 {
98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
99 return 0;
100
101 ieee80211_flush_queues(local, NULL, false);
102
103 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104 return IEEE80211_CONF_CHANGE_IDLE;
105 }
106
107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108 bool force_active)
109 {
110 bool working, scanning, active;
111 unsigned int led_trig_start = 0, led_trig_stop = 0;
112
113 lockdep_assert_held(&local->mtx);
114
115 active = force_active ||
116 !list_empty(&local->chanctx_list) ||
117 local->monitors;
118
119 working = !local->ops->remain_on_channel &&
120 !list_empty(&local->roc_list);
121
122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124
125 if (working || scanning)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129
130 if (active)
131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 else
133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134
135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136
137 if (working || scanning || active)
138 return __ieee80211_idle_off(local);
139 return __ieee80211_idle_on(local);
140 }
141
142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144 return __ieee80211_recalc_idle(local, true);
145 }
146
147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149 u32 change = __ieee80211_recalc_idle(local, false);
150 if (change)
151 ieee80211_hw_config(local, change);
152 }
153
154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155 bool check_dup)
156 {
157 struct ieee80211_local *local = sdata->local;
158 struct ieee80211_sub_if_data *iter;
159 u64 new, mask, tmp;
160 u8 *m;
161 int ret = 0;
162
163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164 return 0;
165
166 m = addr;
167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171 m = local->hw.wiphy->addr_mask;
172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175
176 if (!check_dup)
177 return ret;
178
179 mutex_lock(&local->iflist_mtx);
180 list_for_each_entry(iter, &local->interfaces, list) {
181 if (iter == sdata)
182 continue;
183
184 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186 continue;
187
188 m = iter->vif.addr;
189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192
193 if ((new & ~mask) != (tmp & ~mask)) {
194 ret = -EINVAL;
195 break;
196 }
197 }
198 mutex_unlock(&local->iflist_mtx);
199
200 return ret;
201 }
202
203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
204 {
205 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
206 struct sockaddr *sa = addr;
207 bool check_dup = true;
208 int ret;
209
210 if (ieee80211_sdata_running(sdata))
211 return -EBUSY;
212
213 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
214 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
215 check_dup = false;
216
217 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
218 if (ret)
219 return ret;
220
221 ret = eth_mac_addr(dev, sa);
222
223 if (ret == 0)
224 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
225
226 return ret;
227 }
228
229 static inline int identical_mac_addr_allowed(int type1, int type2)
230 {
231 return type1 == NL80211_IFTYPE_MONITOR ||
232 type2 == NL80211_IFTYPE_MONITOR ||
233 type1 == NL80211_IFTYPE_P2P_DEVICE ||
234 type2 == NL80211_IFTYPE_P2P_DEVICE ||
235 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
236 (type1 == NL80211_IFTYPE_WDS &&
237 (type2 == NL80211_IFTYPE_WDS ||
238 type2 == NL80211_IFTYPE_AP)) ||
239 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
240 (type1 == NL80211_IFTYPE_AP_VLAN &&
241 (type2 == NL80211_IFTYPE_AP ||
242 type2 == NL80211_IFTYPE_AP_VLAN));
243 }
244
245 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
246 enum nl80211_iftype iftype)
247 {
248 struct ieee80211_local *local = sdata->local;
249 struct ieee80211_sub_if_data *nsdata;
250 int ret;
251
252 ASSERT_RTNL();
253
254 /* we hold the RTNL here so can safely walk the list */
255 list_for_each_entry(nsdata, &local->interfaces, list) {
256 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
257 /*
258 * Only OCB and monitor mode may coexist
259 */
260 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
261 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
262 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
263 nsdata->vif.type == NL80211_IFTYPE_OCB))
264 return -EBUSY;
265
266 /*
267 * Allow only a single IBSS interface to be up at any
268 * time. This is restricted because beacon distribution
269 * cannot work properly if both are in the same IBSS.
270 *
271 * To remove this restriction we'd have to disallow them
272 * from setting the same SSID on different IBSS interfaces
273 * belonging to the same hardware. Then, however, we're
274 * faced with having to adopt two different TSF timers...
275 */
276 if (iftype == NL80211_IFTYPE_ADHOC &&
277 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
278 return -EBUSY;
279 /*
280 * will not add another interface while any channel
281 * switch is active.
282 */
283 if (nsdata->vif.csa_active)
284 return -EBUSY;
285
286 /*
287 * The remaining checks are only performed for interfaces
288 * with the same MAC address.
289 */
290 if (!ether_addr_equal(sdata->vif.addr,
291 nsdata->vif.addr))
292 continue;
293
294 /*
295 * check whether it may have the same address
296 */
297 if (!identical_mac_addr_allowed(iftype,
298 nsdata->vif.type))
299 return -ENOTUNIQ;
300
301 /*
302 * can only add VLANs to enabled APs
303 */
304 if (iftype == NL80211_IFTYPE_AP_VLAN &&
305 nsdata->vif.type == NL80211_IFTYPE_AP)
306 sdata->bss = &nsdata->u.ap;
307 }
308 }
309
310 mutex_lock(&local->chanctx_mtx);
311 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
312 mutex_unlock(&local->chanctx_mtx);
313 return ret;
314 }
315
316 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
317 enum nl80211_iftype iftype)
318 {
319 int n_queues = sdata->local->hw.queues;
320 int i;
321
322 if (iftype == NL80211_IFTYPE_NAN)
323 return 0;
324
325 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
326 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
327 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
328 IEEE80211_INVAL_HW_QUEUE))
329 return -EINVAL;
330 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
331 n_queues))
332 return -EINVAL;
333 }
334 }
335
336 if ((iftype != NL80211_IFTYPE_AP &&
337 iftype != NL80211_IFTYPE_P2P_GO &&
338 iftype != NL80211_IFTYPE_MESH_POINT) ||
339 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
340 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
341 return 0;
342 }
343
344 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
345 return -EINVAL;
346
347 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
348 return -EINVAL;
349
350 return 0;
351 }
352
353 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
354 const int offset)
355 {
356 struct ieee80211_local *local = sdata->local;
357 u32 flags = sdata->u.mntr.flags;
358
359 #define ADJUST(_f, _s) do { \
360 if (flags & MONITOR_FLAG_##_f) \
361 local->fif_##_s += offset; \
362 } while (0)
363
364 ADJUST(FCSFAIL, fcsfail);
365 ADJUST(PLCPFAIL, plcpfail);
366 ADJUST(CONTROL, control);
367 ADJUST(CONTROL, pspoll);
368 ADJUST(OTHER_BSS, other_bss);
369
370 #undef ADJUST
371 }
372
373 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
374 {
375 struct ieee80211_local *local = sdata->local;
376 int i;
377
378 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
379 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
380 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
381 else if (local->hw.queues >= IEEE80211_NUM_ACS)
382 sdata->vif.hw_queue[i] = i;
383 else
384 sdata->vif.hw_queue[i] = 0;
385 }
386 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
387 }
388
389 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
390 {
391 struct ieee80211_sub_if_data *sdata;
392 int ret;
393
394 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
395 return 0;
396
397 ASSERT_RTNL();
398
399 if (local->monitor_sdata)
400 return 0;
401
402 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
403 if (!sdata)
404 return -ENOMEM;
405
406 /* set up data */
407 sdata->local = local;
408 sdata->vif.type = NL80211_IFTYPE_MONITOR;
409 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
410 wiphy_name(local->hw.wiphy));
411 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
412
413 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
414
415 ieee80211_set_default_queues(sdata);
416
417 ret = drv_add_interface(local, sdata);
418 if (WARN_ON(ret)) {
419 /* ok .. stupid driver, it asked for this! */
420 kfree(sdata);
421 return ret;
422 }
423
424 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
425 if (ret) {
426 kfree(sdata);
427 return ret;
428 }
429
430 mutex_lock(&local->iflist_mtx);
431 rcu_assign_pointer(local->monitor_sdata, sdata);
432 mutex_unlock(&local->iflist_mtx);
433
434 mutex_lock(&local->mtx);
435 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
436 IEEE80211_CHANCTX_EXCLUSIVE);
437 mutex_unlock(&local->mtx);
438 if (ret) {
439 mutex_lock(&local->iflist_mtx);
440 RCU_INIT_POINTER(local->monitor_sdata, NULL);
441 mutex_unlock(&local->iflist_mtx);
442 synchronize_net();
443 drv_remove_interface(local, sdata);
444 kfree(sdata);
445 return ret;
446 }
447
448 skb_queue_head_init(&sdata->skb_queue);
449 INIT_WORK(&sdata->work, ieee80211_iface_work);
450
451 return 0;
452 }
453
454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
455 {
456 struct ieee80211_sub_if_data *sdata;
457
458 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
459 return;
460
461 ASSERT_RTNL();
462
463 mutex_lock(&local->iflist_mtx);
464
465 sdata = rcu_dereference_protected(local->monitor_sdata,
466 lockdep_is_held(&local->iflist_mtx));
467 if (!sdata) {
468 mutex_unlock(&local->iflist_mtx);
469 return;
470 }
471
472 RCU_INIT_POINTER(local->monitor_sdata, NULL);
473 mutex_unlock(&local->iflist_mtx);
474
475 synchronize_net();
476
477 mutex_lock(&local->mtx);
478 ieee80211_vif_release_channel(sdata);
479 mutex_unlock(&local->mtx);
480
481 drv_remove_interface(local, sdata);
482
483 kfree(sdata);
484 }
485
486 /*
487 * NOTE: Be very careful when changing this function, it must NOT return
488 * an error on interface type changes that have been pre-checked, so most
489 * checks should be in ieee80211_check_concurrent_iface.
490 */
491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
492 {
493 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
494 struct net_device *dev = wdev->netdev;
495 struct ieee80211_local *local = sdata->local;
496 struct sta_info *sta;
497 u32 changed = 0;
498 int res;
499 u32 hw_reconf_flags = 0;
500
501 switch (sdata->vif.type) {
502 case NL80211_IFTYPE_WDS:
503 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
504 return -ENOLINK;
505 break;
506 case NL80211_IFTYPE_AP_VLAN: {
507 struct ieee80211_sub_if_data *master;
508
509 if (!sdata->bss)
510 return -ENOLINK;
511
512 mutex_lock(&local->mtx);
513 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
514 mutex_unlock(&local->mtx);
515
516 master = container_of(sdata->bss,
517 struct ieee80211_sub_if_data, u.ap);
518 sdata->control_port_protocol =
519 master->control_port_protocol;
520 sdata->control_port_no_encrypt =
521 master->control_port_no_encrypt;
522 sdata->vif.cab_queue = master->vif.cab_queue;
523 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
524 sizeof(sdata->vif.hw_queue));
525 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
526
527 mutex_lock(&local->key_mtx);
528 sdata->crypto_tx_tailroom_needed_cnt +=
529 master->crypto_tx_tailroom_needed_cnt;
530 mutex_unlock(&local->key_mtx);
531
532 break;
533 }
534 case NL80211_IFTYPE_AP:
535 sdata->bss = &sdata->u.ap;
536 break;
537 case NL80211_IFTYPE_MESH_POINT:
538 case NL80211_IFTYPE_STATION:
539 case NL80211_IFTYPE_MONITOR:
540 case NL80211_IFTYPE_ADHOC:
541 case NL80211_IFTYPE_P2P_DEVICE:
542 case NL80211_IFTYPE_OCB:
543 case NL80211_IFTYPE_NAN:
544 /* no special treatment */
545 break;
546 case NL80211_IFTYPE_UNSPECIFIED:
547 case NUM_NL80211_IFTYPES:
548 case NL80211_IFTYPE_P2P_CLIENT:
549 case NL80211_IFTYPE_P2P_GO:
550 /* cannot happen */
551 WARN_ON(1);
552 break;
553 }
554
555 if (local->open_count == 0) {
556 res = drv_start(local);
557 if (res)
558 goto err_del_bss;
559 /* we're brought up, everything changes */
560 hw_reconf_flags = ~0;
561 ieee80211_led_radio(local, true);
562 ieee80211_mod_tpt_led_trig(local,
563 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
564 }
565
566 /*
567 * Copy the hopefully now-present MAC address to
568 * this interface, if it has the special null one.
569 */
570 if (dev && is_zero_ether_addr(dev->dev_addr)) {
571 memcpy(dev->dev_addr,
572 local->hw.wiphy->perm_addr,
573 ETH_ALEN);
574 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
575
576 if (!is_valid_ether_addr(dev->dev_addr)) {
577 res = -EADDRNOTAVAIL;
578 goto err_stop;
579 }
580 }
581
582 switch (sdata->vif.type) {
583 case NL80211_IFTYPE_AP_VLAN:
584 /* no need to tell driver, but set carrier and chanctx */
585 if (rtnl_dereference(sdata->bss->beacon)) {
586 ieee80211_vif_vlan_copy_chanctx(sdata);
587 netif_carrier_on(dev);
588 } else {
589 netif_carrier_off(dev);
590 }
591 break;
592 case NL80211_IFTYPE_MONITOR:
593 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
594 local->cooked_mntrs++;
595 break;
596 }
597
598 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
599 res = drv_add_interface(local, sdata);
600 if (res)
601 goto err_stop;
602 } else if (local->monitors == 0 && local->open_count == 0) {
603 res = ieee80211_add_virtual_monitor(local);
604 if (res)
605 goto err_stop;
606 }
607
608 /* must be before the call to ieee80211_configure_filter */
609 local->monitors++;
610 if (local->monitors == 1) {
611 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
612 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
613 }
614
615 ieee80211_adjust_monitor_flags(sdata, 1);
616 ieee80211_configure_filter(local);
617 mutex_lock(&local->mtx);
618 ieee80211_recalc_idle(local);
619 mutex_unlock(&local->mtx);
620
621 netif_carrier_on(dev);
622 break;
623 default:
624 if (coming_up) {
625 ieee80211_del_virtual_monitor(local);
626
627 res = drv_add_interface(local, sdata);
628 if (res)
629 goto err_stop;
630 res = ieee80211_check_queues(sdata,
631 ieee80211_vif_type_p2p(&sdata->vif));
632 if (res)
633 goto err_del_interface;
634 }
635
636 if (sdata->vif.type == NL80211_IFTYPE_AP) {
637 local->fif_pspoll++;
638 local->fif_probe_req++;
639
640 ieee80211_configure_filter(local);
641 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
642 local->fif_probe_req++;
643 }
644
645 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
646 sdata->vif.type != NL80211_IFTYPE_NAN)
647 changed |= ieee80211_reset_erp_info(sdata);
648 ieee80211_bss_info_change_notify(sdata, changed);
649
650 switch (sdata->vif.type) {
651 case NL80211_IFTYPE_STATION:
652 case NL80211_IFTYPE_ADHOC:
653 case NL80211_IFTYPE_AP:
654 case NL80211_IFTYPE_MESH_POINT:
655 case NL80211_IFTYPE_OCB:
656 netif_carrier_off(dev);
657 break;
658 case NL80211_IFTYPE_WDS:
659 case NL80211_IFTYPE_P2P_DEVICE:
660 case NL80211_IFTYPE_NAN:
661 break;
662 default:
663 /* not reached */
664 WARN_ON(1);
665 }
666
667 /*
668 * Set default queue parameters so drivers don't
669 * need to initialise the hardware if the hardware
670 * doesn't start up with sane defaults.
671 * Enable QoS for anything but station interfaces.
672 */
673 ieee80211_set_wmm_default(sdata, true,
674 sdata->vif.type != NL80211_IFTYPE_STATION);
675 }
676
677 set_bit(SDATA_STATE_RUNNING, &sdata->state);
678
679 switch (sdata->vif.type) {
680 case NL80211_IFTYPE_WDS:
681 /* Create STA entry for the WDS peer */
682 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
683 GFP_KERNEL);
684 if (!sta) {
685 res = -ENOMEM;
686 goto err_del_interface;
687 }
688
689 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
690 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
691 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
692
693 res = sta_info_insert(sta);
694 if (res) {
695 /* STA has been freed */
696 goto err_del_interface;
697 }
698
699 rate_control_rate_init(sta);
700 netif_carrier_on(dev);
701 break;
702 case NL80211_IFTYPE_P2P_DEVICE:
703 rcu_assign_pointer(local->p2p_sdata, sdata);
704 break;
705 case NL80211_IFTYPE_MONITOR:
706 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
707 break;
708 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
709 break;
710 default:
711 break;
712 }
713
714 /*
715 * set_multicast_list will be invoked by the networking core
716 * which will check whether any increments here were done in
717 * error and sync them down to the hardware as filter flags.
718 */
719 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
720 atomic_inc(&local->iff_allmultis);
721
722 if (coming_up)
723 local->open_count++;
724
725 if (hw_reconf_flags)
726 ieee80211_hw_config(local, hw_reconf_flags);
727
728 ieee80211_recalc_ps(local);
729
730 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
731 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
732 local->ops->wake_tx_queue) {
733 /* XXX: for AP_VLAN, actually track AP queues */
734 netif_tx_start_all_queues(dev);
735 } else if (dev) {
736 unsigned long flags;
737 int n_acs = IEEE80211_NUM_ACS;
738 int ac;
739
740 if (local->hw.queues < IEEE80211_NUM_ACS)
741 n_acs = 1;
742
743 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
744 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
745 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
746 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
747 for (ac = 0; ac < n_acs; ac++) {
748 int ac_queue = sdata->vif.hw_queue[ac];
749
750 if (local->queue_stop_reasons[ac_queue] == 0 &&
751 skb_queue_empty(&local->pending[ac_queue]))
752 netif_start_subqueue(dev, ac);
753 }
754 }
755 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
756 }
757
758 return 0;
759 err_del_interface:
760 drv_remove_interface(local, sdata);
761 err_stop:
762 if (!local->open_count)
763 drv_stop(local);
764 err_del_bss:
765 sdata->bss = NULL;
766 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
767 mutex_lock(&local->mtx);
768 list_del(&sdata->u.vlan.list);
769 mutex_unlock(&local->mtx);
770 }
771 /* might already be clear but that doesn't matter */
772 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
773 return res;
774 }
775
776 static int ieee80211_open(struct net_device *dev)
777 {
778 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
779 int err;
780
781 /* fail early if user set an invalid address */
782 if (!is_valid_ether_addr(dev->dev_addr))
783 return -EADDRNOTAVAIL;
784
785 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
786 if (err)
787 return err;
788
789 return ieee80211_do_open(&sdata->wdev, true);
790 }
791
792 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
793 bool going_down)
794 {
795 struct ieee80211_local *local = sdata->local;
796 struct fq *fq = &local->fq;
797 unsigned long flags;
798 struct sk_buff *skb, *tmp;
799 u32 hw_reconf_flags = 0;
800 int i, flushed;
801 struct ps_data *ps;
802 struct cfg80211_chan_def chandef;
803 bool cancel_scan;
804 struct cfg80211_nan_func *func;
805
806 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
807
808 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
809 if (cancel_scan)
810 ieee80211_scan_cancel(local);
811
812 /*
813 * Stop TX on this interface first.
814 */
815 if (sdata->dev)
816 netif_tx_stop_all_queues(sdata->dev);
817
818 ieee80211_roc_purge(local, sdata);
819
820 switch (sdata->vif.type) {
821 case NL80211_IFTYPE_STATION:
822 ieee80211_mgd_stop(sdata);
823 break;
824 case NL80211_IFTYPE_ADHOC:
825 ieee80211_ibss_stop(sdata);
826 break;
827 case NL80211_IFTYPE_AP:
828 cancel_work_sync(&sdata->u.ap.request_smps_work);
829 break;
830 case NL80211_IFTYPE_MONITOR:
831 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
832 break;
833 list_del_rcu(&sdata->u.mntr.list);
834 break;
835 default:
836 break;
837 }
838
839 /*
840 * Remove all stations associated with this interface.
841 *
842 * This must be done before calling ops->remove_interface()
843 * because otherwise we can later invoke ops->sta_notify()
844 * whenever the STAs are removed, and that invalidates driver
845 * assumptions about always getting a vif pointer that is valid
846 * (because if we remove a STA after ops->remove_interface()
847 * the driver will have removed the vif info already!)
848 *
849 * In WDS mode a station must exist here and be flushed, for
850 * AP_VLANs stations may exist since there's nothing else that
851 * would have removed them, but in other modes there shouldn't
852 * be any stations.
853 */
854 flushed = sta_info_flush(sdata);
855 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
856 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
857 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
858
859 /* don't count this interface for allmulti while it is down */
860 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
861 atomic_dec(&local->iff_allmultis);
862
863 if (sdata->vif.type == NL80211_IFTYPE_AP) {
864 local->fif_pspoll--;
865 local->fif_probe_req--;
866 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
867 local->fif_probe_req--;
868 }
869
870 if (sdata->dev) {
871 netif_addr_lock_bh(sdata->dev);
872 spin_lock_bh(&local->filter_lock);
873 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
874 sdata->dev->addr_len);
875 spin_unlock_bh(&local->filter_lock);
876 netif_addr_unlock_bh(sdata->dev);
877 }
878
879 del_timer_sync(&local->dynamic_ps_timer);
880 cancel_work_sync(&local->dynamic_ps_enable_work);
881
882 cancel_work_sync(&sdata->recalc_smps);
883 sdata_lock(sdata);
884 mutex_lock(&local->mtx);
885 sdata->vif.csa_active = false;
886 if (sdata->vif.type == NL80211_IFTYPE_STATION)
887 sdata->u.mgd.csa_waiting_bcn = false;
888 if (sdata->csa_block_tx) {
889 ieee80211_wake_vif_queues(local, sdata,
890 IEEE80211_QUEUE_STOP_REASON_CSA);
891 sdata->csa_block_tx = false;
892 }
893 mutex_unlock(&local->mtx);
894 sdata_unlock(sdata);
895
896 cancel_work_sync(&sdata->csa_finalize_work);
897
898 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
899
900 if (sdata->wdev.cac_started) {
901 chandef = sdata->vif.bss_conf.chandef;
902 WARN_ON(local->suspended);
903 mutex_lock(&local->mtx);
904 ieee80211_vif_release_channel(sdata);
905 mutex_unlock(&local->mtx);
906 cfg80211_cac_event(sdata->dev, &chandef,
907 NL80211_RADAR_CAC_ABORTED,
908 GFP_KERNEL);
909 }
910
911 /* APs need special treatment */
912 if (sdata->vif.type == NL80211_IFTYPE_AP) {
913 struct ieee80211_sub_if_data *vlan, *tmpsdata;
914
915 /* down all dependent devices, that is VLANs */
916 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
917 u.vlan.list)
918 dev_close(vlan->dev);
919 WARN_ON(!list_empty(&sdata->u.ap.vlans));
920 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
921 /* remove all packets in parent bc_buf pointing to this dev */
922 ps = &sdata->bss->ps;
923
924 spin_lock_irqsave(&ps->bc_buf.lock, flags);
925 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
926 if (skb->dev == sdata->dev) {
927 __skb_unlink(skb, &ps->bc_buf);
928 local->total_ps_buffered--;
929 ieee80211_free_txskb(&local->hw, skb);
930 }
931 }
932 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
933 }
934
935 if (going_down)
936 local->open_count--;
937
938 switch (sdata->vif.type) {
939 case NL80211_IFTYPE_AP_VLAN:
940 mutex_lock(&local->mtx);
941 list_del(&sdata->u.vlan.list);
942 mutex_unlock(&local->mtx);
943 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
944 /* see comment in the default case below */
945 ieee80211_free_keys(sdata, true);
946 /* no need to tell driver */
947 break;
948 case NL80211_IFTYPE_MONITOR:
949 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
950 local->cooked_mntrs--;
951 break;
952 }
953
954 local->monitors--;
955 if (local->monitors == 0) {
956 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
957 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
958 }
959
960 ieee80211_adjust_monitor_flags(sdata, -1);
961 break;
962 case NL80211_IFTYPE_NAN:
963 /* clean all the functions */
964 spin_lock_bh(&sdata->u.nan.func_lock);
965
966 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
967 idr_remove(&sdata->u.nan.function_inst_ids, i);
968 cfg80211_free_nan_func(func);
969 }
970 idr_destroy(&sdata->u.nan.function_inst_ids);
971
972 spin_unlock_bh(&sdata->u.nan.func_lock);
973 break;
974 case NL80211_IFTYPE_P2P_DEVICE:
975 /* relies on synchronize_rcu() below */
976 RCU_INIT_POINTER(local->p2p_sdata, NULL);
977 /* fall through */
978 default:
979 cancel_work_sync(&sdata->work);
980 /*
981 * When we get here, the interface is marked down.
982 * Free the remaining keys, if there are any
983 * (which can happen in AP mode if userspace sets
984 * keys before the interface is operating, and maybe
985 * also in WDS mode)
986 *
987 * Force the key freeing to always synchronize_net()
988 * to wait for the RX path in case it is using this
989 * interface enqueuing frames at this very time on
990 * another CPU.
991 */
992 ieee80211_free_keys(sdata, true);
993 skb_queue_purge(&sdata->skb_queue);
994 }
995
996 sdata->bss = NULL;
997
998 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
999 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1000 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1001 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1002 if (info->control.vif == &sdata->vif) {
1003 __skb_unlink(skb, &local->pending[i]);
1004 ieee80211_free_txskb(&local->hw, skb);
1005 }
1006 }
1007 }
1008 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1009
1010 if (sdata->vif.txq) {
1011 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
1012
1013 spin_lock_bh(&fq->lock);
1014 ieee80211_txq_purge(local, txqi);
1015 spin_unlock_bh(&fq->lock);
1016 }
1017
1018 if (local->open_count == 0)
1019 ieee80211_clear_tx_pending(local);
1020
1021 /*
1022 * If the interface goes down while suspended, presumably because
1023 * the device was unplugged and that happens before our resume,
1024 * then the driver is already unconfigured and the remainder of
1025 * this function isn't needed.
1026 * XXX: what about WoWLAN? If the device has software state, e.g.
1027 * memory allocated, it might expect teardown commands from
1028 * mac80211 here?
1029 */
1030 if (local->suspended) {
1031 WARN_ON(local->wowlan);
1032 WARN_ON(rtnl_dereference(local->monitor_sdata));
1033 return;
1034 }
1035
1036 switch (sdata->vif.type) {
1037 case NL80211_IFTYPE_AP_VLAN:
1038 break;
1039 case NL80211_IFTYPE_MONITOR:
1040 if (local->monitors == 0)
1041 ieee80211_del_virtual_monitor(local);
1042
1043 mutex_lock(&local->mtx);
1044 ieee80211_recalc_idle(local);
1045 mutex_unlock(&local->mtx);
1046
1047 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1048 break;
1049
1050 /* fall through */
1051 default:
1052 if (going_down)
1053 drv_remove_interface(local, sdata);
1054 }
1055
1056 ieee80211_recalc_ps(local);
1057
1058 if (cancel_scan)
1059 flush_delayed_work(&local->scan_work);
1060
1061 if (local->open_count == 0) {
1062 ieee80211_stop_device(local);
1063
1064 /* no reconfiguring after stop! */
1065 return;
1066 }
1067
1068 /* do after stop to avoid reconfiguring when we stop anyway */
1069 ieee80211_configure_filter(local);
1070 ieee80211_hw_config(local, hw_reconf_flags);
1071
1072 if (local->monitors == local->open_count)
1073 ieee80211_add_virtual_monitor(local);
1074 }
1075
1076 static int ieee80211_stop(struct net_device *dev)
1077 {
1078 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1079
1080 ieee80211_do_stop(sdata, true);
1081
1082 return 0;
1083 }
1084
1085 static void ieee80211_set_multicast_list(struct net_device *dev)
1086 {
1087 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1088 struct ieee80211_local *local = sdata->local;
1089 int allmulti, sdata_allmulti;
1090
1091 allmulti = !!(dev->flags & IFF_ALLMULTI);
1092 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1093
1094 if (allmulti != sdata_allmulti) {
1095 if (dev->flags & IFF_ALLMULTI)
1096 atomic_inc(&local->iff_allmultis);
1097 else
1098 atomic_dec(&local->iff_allmultis);
1099 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1100 }
1101
1102 spin_lock_bh(&local->filter_lock);
1103 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1104 spin_unlock_bh(&local->filter_lock);
1105 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1106 }
1107
1108 /*
1109 * Called when the netdev is removed or, by the code below, before
1110 * the interface type changes.
1111 */
1112 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1113 {
1114 int i;
1115
1116 /* free extra data */
1117 ieee80211_free_keys(sdata, false);
1118
1119 ieee80211_debugfs_remove_netdev(sdata);
1120
1121 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1122 __skb_queue_purge(&sdata->fragments[i].skb_list);
1123 sdata->fragment_next = 0;
1124
1125 if (ieee80211_vif_is_mesh(&sdata->vif))
1126 ieee80211_mesh_teardown_sdata(sdata);
1127 }
1128
1129 static void ieee80211_uninit(struct net_device *dev)
1130 {
1131 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1132 }
1133
1134 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1135 struct sk_buff *skb,
1136 void *accel_priv,
1137 select_queue_fallback_t fallback)
1138 {
1139 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1140 }
1141
1142 static void
1143 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1144 {
1145 int i;
1146
1147 for_each_possible_cpu(i) {
1148 const struct pcpu_sw_netstats *tstats;
1149 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1150 unsigned int start;
1151
1152 tstats = per_cpu_ptr(dev->tstats, i);
1153
1154 do {
1155 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1156 rx_packets = tstats->rx_packets;
1157 tx_packets = tstats->tx_packets;
1158 rx_bytes = tstats->rx_bytes;
1159 tx_bytes = tstats->tx_bytes;
1160 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1161
1162 stats->rx_packets += rx_packets;
1163 stats->tx_packets += tx_packets;
1164 stats->rx_bytes += rx_bytes;
1165 stats->tx_bytes += tx_bytes;
1166 }
1167 }
1168
1169 static const struct net_device_ops ieee80211_dataif_ops = {
1170 .ndo_open = ieee80211_open,
1171 .ndo_stop = ieee80211_stop,
1172 .ndo_uninit = ieee80211_uninit,
1173 .ndo_start_xmit = ieee80211_subif_start_xmit,
1174 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1175 .ndo_set_mac_address = ieee80211_change_mac,
1176 .ndo_select_queue = ieee80211_netdev_select_queue,
1177 .ndo_get_stats64 = ieee80211_get_stats64,
1178 };
1179
1180 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1181 struct sk_buff *skb,
1182 void *accel_priv,
1183 select_queue_fallback_t fallback)
1184 {
1185 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1186 struct ieee80211_local *local = sdata->local;
1187 struct ieee80211_hdr *hdr;
1188 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1189
1190 if (local->hw.queues < IEEE80211_NUM_ACS)
1191 return 0;
1192
1193 if (skb->len < 4 ||
1194 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1195 return 0; /* doesn't matter, frame will be dropped */
1196
1197 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1198
1199 return ieee80211_select_queue_80211(sdata, skb, hdr);
1200 }
1201
1202 static const struct net_device_ops ieee80211_monitorif_ops = {
1203 .ndo_open = ieee80211_open,
1204 .ndo_stop = ieee80211_stop,
1205 .ndo_uninit = ieee80211_uninit,
1206 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1207 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1208 .ndo_set_mac_address = ieee80211_change_mac,
1209 .ndo_select_queue = ieee80211_monitor_select_queue,
1210 .ndo_get_stats64 = ieee80211_get_stats64,
1211 };
1212
1213 static void ieee80211_if_free(struct net_device *dev)
1214 {
1215 free_percpu(dev->tstats);
1216 free_netdev(dev);
1217 }
1218
1219 static void ieee80211_if_setup(struct net_device *dev)
1220 {
1221 ether_setup(dev);
1222 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1223 dev->netdev_ops = &ieee80211_dataif_ops;
1224 dev->destructor = ieee80211_if_free;
1225 }
1226
1227 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1228 {
1229 ieee80211_if_setup(dev);
1230 dev->priv_flags |= IFF_NO_QUEUE;
1231 }
1232
1233 static void ieee80211_iface_work(struct work_struct *work)
1234 {
1235 struct ieee80211_sub_if_data *sdata =
1236 container_of(work, struct ieee80211_sub_if_data, work);
1237 struct ieee80211_local *local = sdata->local;
1238 struct sk_buff *skb;
1239 struct sta_info *sta;
1240 struct ieee80211_ra_tid *ra_tid;
1241 struct ieee80211_rx_agg *rx_agg;
1242
1243 if (!ieee80211_sdata_running(sdata))
1244 return;
1245
1246 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1247 return;
1248
1249 if (!ieee80211_can_run_worker(local))
1250 return;
1251
1252 /* first process frames */
1253 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1254 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1255
1256 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1257 ra_tid = (void *)&skb->cb;
1258 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1259 ra_tid->tid);
1260 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1261 ra_tid = (void *)&skb->cb;
1262 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1263 ra_tid->tid);
1264 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1265 rx_agg = (void *)&skb->cb;
1266 mutex_lock(&local->sta_mtx);
1267 sta = sta_info_get_bss(sdata, rx_agg->addr);
1268 if (sta)
1269 __ieee80211_start_rx_ba_session(sta,
1270 0, 0, 0, 1, rx_agg->tid,
1271 IEEE80211_MAX_AMPDU_BUF,
1272 false, true);
1273 mutex_unlock(&local->sta_mtx);
1274 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1275 rx_agg = (void *)&skb->cb;
1276 mutex_lock(&local->sta_mtx);
1277 sta = sta_info_get_bss(sdata, rx_agg->addr);
1278 if (sta)
1279 __ieee80211_stop_rx_ba_session(sta,
1280 rx_agg->tid,
1281 WLAN_BACK_RECIPIENT, 0,
1282 false);
1283 mutex_unlock(&local->sta_mtx);
1284 } else if (ieee80211_is_action(mgmt->frame_control) &&
1285 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1286 int len = skb->len;
1287
1288 mutex_lock(&local->sta_mtx);
1289 sta = sta_info_get_bss(sdata, mgmt->sa);
1290 if (sta) {
1291 switch (mgmt->u.action.u.addba_req.action_code) {
1292 case WLAN_ACTION_ADDBA_REQ:
1293 ieee80211_process_addba_request(
1294 local, sta, mgmt, len);
1295 break;
1296 case WLAN_ACTION_ADDBA_RESP:
1297 ieee80211_process_addba_resp(local, sta,
1298 mgmt, len);
1299 break;
1300 case WLAN_ACTION_DELBA:
1301 ieee80211_process_delba(sdata, sta,
1302 mgmt, len);
1303 break;
1304 default:
1305 WARN_ON(1);
1306 break;
1307 }
1308 }
1309 mutex_unlock(&local->sta_mtx);
1310 } else if (ieee80211_is_action(mgmt->frame_control) &&
1311 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1312 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1313 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1314 struct ieee80211_rx_status *status;
1315 enum nl80211_band band;
1316 u8 opmode;
1317
1318 status = IEEE80211_SKB_RXCB(skb);
1319 band = status->band;
1320 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1321
1322 mutex_lock(&local->sta_mtx);
1323 sta = sta_info_get_bss(sdata, mgmt->sa);
1324
1325 if (sta)
1326 ieee80211_vht_handle_opmode(sdata, sta,
1327 opmode,
1328 band);
1329
1330 mutex_unlock(&local->sta_mtx);
1331 break;
1332 }
1333 case WLAN_VHT_ACTION_GROUPID_MGMT:
1334 ieee80211_process_mu_groups(sdata, mgmt);
1335 break;
1336 default:
1337 WARN_ON(1);
1338 break;
1339 }
1340 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1341 struct ieee80211_hdr *hdr = (void *)mgmt;
1342 /*
1343 * So the frame isn't mgmt, but frame_control
1344 * is at the right place anyway, of course, so
1345 * the if statement is correct.
1346 *
1347 * Warn if we have other data frame types here,
1348 * they must not get here.
1349 */
1350 WARN_ON(hdr->frame_control &
1351 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1352 WARN_ON(!(hdr->seq_ctrl &
1353 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1354 /*
1355 * This was a fragment of a frame, received while
1356 * a block-ack session was active. That cannot be
1357 * right, so terminate the session.
1358 */
1359 mutex_lock(&local->sta_mtx);
1360 sta = sta_info_get_bss(sdata, mgmt->sa);
1361 if (sta) {
1362 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1363 IEEE80211_QOS_CTL_TID_MASK;
1364
1365 __ieee80211_stop_rx_ba_session(
1366 sta, tid, WLAN_BACK_RECIPIENT,
1367 WLAN_REASON_QSTA_REQUIRE_SETUP,
1368 true);
1369 }
1370 mutex_unlock(&local->sta_mtx);
1371 } else switch (sdata->vif.type) {
1372 case NL80211_IFTYPE_STATION:
1373 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1374 break;
1375 case NL80211_IFTYPE_ADHOC:
1376 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1377 break;
1378 case NL80211_IFTYPE_MESH_POINT:
1379 if (!ieee80211_vif_is_mesh(&sdata->vif))
1380 break;
1381 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1382 break;
1383 default:
1384 WARN(1, "frame for unexpected interface type");
1385 break;
1386 }
1387
1388 kfree_skb(skb);
1389 }
1390
1391 /* then other type-dependent work */
1392 switch (sdata->vif.type) {
1393 case NL80211_IFTYPE_STATION:
1394 ieee80211_sta_work(sdata);
1395 break;
1396 case NL80211_IFTYPE_ADHOC:
1397 ieee80211_ibss_work(sdata);
1398 break;
1399 case NL80211_IFTYPE_MESH_POINT:
1400 if (!ieee80211_vif_is_mesh(&sdata->vif))
1401 break;
1402 ieee80211_mesh_work(sdata);
1403 break;
1404 case NL80211_IFTYPE_OCB:
1405 ieee80211_ocb_work(sdata);
1406 break;
1407 default:
1408 break;
1409 }
1410 }
1411
1412 static void ieee80211_recalc_smps_work(struct work_struct *work)
1413 {
1414 struct ieee80211_sub_if_data *sdata =
1415 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1416
1417 ieee80211_recalc_smps(sdata);
1418 }
1419
1420 /*
1421 * Helper function to initialise an interface to a specific type.
1422 */
1423 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1424 enum nl80211_iftype type)
1425 {
1426 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1427 0xff, 0xff, 0xff};
1428
1429 /* clear type-dependent union */
1430 memset(&sdata->u, 0, sizeof(sdata->u));
1431
1432 /* and set some type-dependent values */
1433 sdata->vif.type = type;
1434 sdata->vif.p2p = false;
1435 sdata->wdev.iftype = type;
1436
1437 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1438 sdata->control_port_no_encrypt = false;
1439 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1440 sdata->vif.bss_conf.idle = true;
1441
1442 sdata->noack_map = 0;
1443
1444 /* only monitor/p2p-device differ */
1445 if (sdata->dev) {
1446 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1447 sdata->dev->type = ARPHRD_ETHER;
1448 }
1449
1450 skb_queue_head_init(&sdata->skb_queue);
1451 INIT_WORK(&sdata->work, ieee80211_iface_work);
1452 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1453 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1454 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1455 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1456
1457 switch (type) {
1458 case NL80211_IFTYPE_P2P_GO:
1459 type = NL80211_IFTYPE_AP;
1460 sdata->vif.type = type;
1461 sdata->vif.p2p = true;
1462 /* fall through */
1463 case NL80211_IFTYPE_AP:
1464 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1465 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1466 INIT_WORK(&sdata->u.ap.request_smps_work,
1467 ieee80211_request_smps_ap_work);
1468 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1469 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1470 break;
1471 case NL80211_IFTYPE_P2P_CLIENT:
1472 type = NL80211_IFTYPE_STATION;
1473 sdata->vif.type = type;
1474 sdata->vif.p2p = true;
1475 /* fall through */
1476 case NL80211_IFTYPE_STATION:
1477 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1478 ieee80211_sta_setup_sdata(sdata);
1479 break;
1480 case NL80211_IFTYPE_OCB:
1481 sdata->vif.bss_conf.bssid = bssid_wildcard;
1482 ieee80211_ocb_setup_sdata(sdata);
1483 break;
1484 case NL80211_IFTYPE_ADHOC:
1485 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1486 ieee80211_ibss_setup_sdata(sdata);
1487 break;
1488 case NL80211_IFTYPE_MESH_POINT:
1489 if (ieee80211_vif_is_mesh(&sdata->vif))
1490 ieee80211_mesh_init_sdata(sdata);
1491 break;
1492 case NL80211_IFTYPE_MONITOR:
1493 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1494 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1495 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1496 MONITOR_FLAG_OTHER_BSS;
1497 break;
1498 case NL80211_IFTYPE_WDS:
1499 sdata->vif.bss_conf.bssid = NULL;
1500 break;
1501 case NL80211_IFTYPE_NAN:
1502 idr_init(&sdata->u.nan.function_inst_ids);
1503 spin_lock_init(&sdata->u.nan.func_lock);
1504 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1505 break;
1506 case NL80211_IFTYPE_AP_VLAN:
1507 case NL80211_IFTYPE_P2P_DEVICE:
1508 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1509 break;
1510 case NL80211_IFTYPE_UNSPECIFIED:
1511 case NUM_NL80211_IFTYPES:
1512 BUG();
1513 break;
1514 }
1515
1516 ieee80211_debugfs_add_netdev(sdata);
1517 }
1518
1519 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1520 enum nl80211_iftype type)
1521 {
1522 struct ieee80211_local *local = sdata->local;
1523 int ret, err;
1524 enum nl80211_iftype internal_type = type;
1525 bool p2p = false;
1526
1527 ASSERT_RTNL();
1528
1529 if (!local->ops->change_interface)
1530 return -EBUSY;
1531
1532 switch (sdata->vif.type) {
1533 case NL80211_IFTYPE_AP:
1534 case NL80211_IFTYPE_STATION:
1535 case NL80211_IFTYPE_ADHOC:
1536 case NL80211_IFTYPE_OCB:
1537 /*
1538 * Could maybe also all others here?
1539 * Just not sure how that interacts
1540 * with the RX/config path e.g. for
1541 * mesh.
1542 */
1543 break;
1544 default:
1545 return -EBUSY;
1546 }
1547
1548 switch (type) {
1549 case NL80211_IFTYPE_AP:
1550 case NL80211_IFTYPE_STATION:
1551 case NL80211_IFTYPE_ADHOC:
1552 case NL80211_IFTYPE_OCB:
1553 /*
1554 * Could probably support everything
1555 * but WDS here (WDS do_open can fail
1556 * under memory pressure, which this
1557 * code isn't prepared to handle).
1558 */
1559 break;
1560 case NL80211_IFTYPE_P2P_CLIENT:
1561 p2p = true;
1562 internal_type = NL80211_IFTYPE_STATION;
1563 break;
1564 case NL80211_IFTYPE_P2P_GO:
1565 p2p = true;
1566 internal_type = NL80211_IFTYPE_AP;
1567 break;
1568 default:
1569 return -EBUSY;
1570 }
1571
1572 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1573 if (ret)
1574 return ret;
1575
1576 ieee80211_do_stop(sdata, false);
1577
1578 ieee80211_teardown_sdata(sdata);
1579
1580 ret = drv_change_interface(local, sdata, internal_type, p2p);
1581 if (ret)
1582 type = ieee80211_vif_type_p2p(&sdata->vif);
1583
1584 /*
1585 * Ignore return value here, there's not much we can do since
1586 * the driver changed the interface type internally already.
1587 * The warnings will hopefully make driver authors fix it :-)
1588 */
1589 ieee80211_check_queues(sdata, type);
1590
1591 ieee80211_setup_sdata(sdata, type);
1592
1593 err = ieee80211_do_open(&sdata->wdev, false);
1594 WARN(err, "type change: do_open returned %d", err);
1595
1596 return ret;
1597 }
1598
1599 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1600 enum nl80211_iftype type)
1601 {
1602 int ret;
1603
1604 ASSERT_RTNL();
1605
1606 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1607 return 0;
1608
1609 if (ieee80211_sdata_running(sdata)) {
1610 ret = ieee80211_runtime_change_iftype(sdata, type);
1611 if (ret)
1612 return ret;
1613 } else {
1614 /* Purge and reset type-dependent state. */
1615 ieee80211_teardown_sdata(sdata);
1616 ieee80211_setup_sdata(sdata, type);
1617 }
1618
1619 /* reset some values that shouldn't be kept across type changes */
1620 if (type == NL80211_IFTYPE_STATION)
1621 sdata->u.mgd.use_4addr = false;
1622
1623 return 0;
1624 }
1625
1626 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1627 u8 *perm_addr, enum nl80211_iftype type)
1628 {
1629 struct ieee80211_sub_if_data *sdata;
1630 u64 mask, start, addr, val, inc;
1631 u8 *m;
1632 u8 tmp_addr[ETH_ALEN];
1633 int i;
1634
1635 /* default ... something at least */
1636 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1637
1638 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1639 local->hw.wiphy->n_addresses <= 1)
1640 return;
1641
1642 mutex_lock(&local->iflist_mtx);
1643
1644 switch (type) {
1645 case NL80211_IFTYPE_MONITOR:
1646 /* doesn't matter */
1647 break;
1648 case NL80211_IFTYPE_WDS:
1649 case NL80211_IFTYPE_AP_VLAN:
1650 /* match up with an AP interface */
1651 list_for_each_entry(sdata, &local->interfaces, list) {
1652 if (sdata->vif.type != NL80211_IFTYPE_AP)
1653 continue;
1654 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1655 break;
1656 }
1657 /* keep default if no AP interface present */
1658 break;
1659 case NL80211_IFTYPE_P2P_CLIENT:
1660 case NL80211_IFTYPE_P2P_GO:
1661 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1662 list_for_each_entry(sdata, &local->interfaces, list) {
1663 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1664 continue;
1665 if (!ieee80211_sdata_running(sdata))
1666 continue;
1667 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1668 goto out_unlock;
1669 }
1670 }
1671 /* otherwise fall through */
1672 default:
1673 /* assign a new address if possible -- try n_addresses first */
1674 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1675 bool used = false;
1676
1677 list_for_each_entry(sdata, &local->interfaces, list) {
1678 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1679 sdata->vif.addr)) {
1680 used = true;
1681 break;
1682 }
1683 }
1684
1685 if (!used) {
1686 memcpy(perm_addr,
1687 local->hw.wiphy->addresses[i].addr,
1688 ETH_ALEN);
1689 break;
1690 }
1691 }
1692
1693 /* try mask if available */
1694 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1695 break;
1696
1697 m = local->hw.wiphy->addr_mask;
1698 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1699 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1700 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1701
1702 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1703 /* not a contiguous mask ... not handled now! */
1704 pr_info("not contiguous\n");
1705 break;
1706 }
1707
1708 /*
1709 * Pick address of existing interface in case user changed
1710 * MAC address manually, default to perm_addr.
1711 */
1712 m = local->hw.wiphy->perm_addr;
1713 list_for_each_entry(sdata, &local->interfaces, list) {
1714 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1715 continue;
1716 m = sdata->vif.addr;
1717 break;
1718 }
1719 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1720 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1721 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1722
1723 inc = 1ULL<<__ffs64(mask);
1724 val = (start & mask);
1725 addr = (start & ~mask) | (val & mask);
1726 do {
1727 bool used = false;
1728
1729 tmp_addr[5] = addr >> 0*8;
1730 tmp_addr[4] = addr >> 1*8;
1731 tmp_addr[3] = addr >> 2*8;
1732 tmp_addr[2] = addr >> 3*8;
1733 tmp_addr[1] = addr >> 4*8;
1734 tmp_addr[0] = addr >> 5*8;
1735
1736 val += inc;
1737
1738 list_for_each_entry(sdata, &local->interfaces, list) {
1739 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1740 used = true;
1741 break;
1742 }
1743 }
1744
1745 if (!used) {
1746 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1747 break;
1748 }
1749 addr = (start & ~mask) | (val & mask);
1750 } while (addr != start);
1751
1752 break;
1753 }
1754
1755 out_unlock:
1756 mutex_unlock(&local->iflist_mtx);
1757 }
1758
1759 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1760 unsigned char name_assign_type,
1761 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1762 struct vif_params *params)
1763 {
1764 struct net_device *ndev = NULL;
1765 struct ieee80211_sub_if_data *sdata = NULL;
1766 struct txq_info *txqi;
1767 void (*if_setup)(struct net_device *dev);
1768 int ret, i;
1769 int txqs = 1;
1770
1771 ASSERT_RTNL();
1772
1773 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1774 struct wireless_dev *wdev;
1775
1776 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1777 GFP_KERNEL);
1778 if (!sdata)
1779 return -ENOMEM;
1780 wdev = &sdata->wdev;
1781
1782 sdata->dev = NULL;
1783 strlcpy(sdata->name, name, IFNAMSIZ);
1784 ieee80211_assign_perm_addr(local, wdev->address, type);
1785 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1786 } else {
1787 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1788 sizeof(void *));
1789 int txq_size = 0;
1790
1791 if (local->ops->wake_tx_queue)
1792 txq_size += sizeof(struct txq_info) +
1793 local->hw.txq_data_size;
1794
1795 if (local->ops->wake_tx_queue)
1796 if_setup = ieee80211_if_setup_no_queue;
1797 else
1798 if_setup = ieee80211_if_setup;
1799
1800 if (local->hw.queues >= IEEE80211_NUM_ACS)
1801 txqs = IEEE80211_NUM_ACS;
1802
1803 ndev = alloc_netdev_mqs(size + txq_size,
1804 name, name_assign_type,
1805 if_setup, txqs, 1);
1806 if (!ndev)
1807 return -ENOMEM;
1808 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1809
1810 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1811 if (!ndev->tstats) {
1812 free_netdev(ndev);
1813 return -ENOMEM;
1814 }
1815
1816 ndev->needed_headroom = local->tx_headroom +
1817 4*6 /* four MAC addresses */
1818 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1819 + 6 /* mesh */
1820 + 8 /* rfc1042/bridge tunnel */
1821 - ETH_HLEN /* ethernet hard_header_len */
1822 + IEEE80211_ENCRYPT_HEADROOM;
1823 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1824
1825 ret = dev_alloc_name(ndev, ndev->name);
1826 if (ret < 0) {
1827 ieee80211_if_free(ndev);
1828 return ret;
1829 }
1830
1831 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1832 if (params && is_valid_ether_addr(params->macaddr))
1833 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1834 else
1835 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1836 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1837
1838 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1839 sdata = netdev_priv(ndev);
1840 ndev->ieee80211_ptr = &sdata->wdev;
1841 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1842 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1843
1844 if (txq_size) {
1845 txqi = netdev_priv(ndev) + size;
1846 ieee80211_txq_init(sdata, NULL, txqi, 0);
1847 }
1848
1849 sdata->dev = ndev;
1850 }
1851
1852 /* initialise type-independent data */
1853 sdata->wdev.wiphy = local->hw.wiphy;
1854 sdata->local = local;
1855
1856 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1857 skb_queue_head_init(&sdata->fragments[i].skb_list);
1858
1859 INIT_LIST_HEAD(&sdata->key_list);
1860
1861 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1862 ieee80211_dfs_cac_timer_work);
1863 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1864 ieee80211_delayed_tailroom_dec);
1865
1866 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1867 struct ieee80211_supported_band *sband;
1868 sband = local->hw.wiphy->bands[i];
1869 sdata->rc_rateidx_mask[i] =
1870 sband ? (1 << sband->n_bitrates) - 1 : 0;
1871 if (sband) {
1872 __le16 cap;
1873 u16 *vht_rate_mask;
1874
1875 memcpy(sdata->rc_rateidx_mcs_mask[i],
1876 sband->ht_cap.mcs.rx_mask,
1877 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1878
1879 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1880 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1881 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1882 } else {
1883 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1884 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1885 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1886 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1887 }
1888 }
1889
1890 ieee80211_set_default_queues(sdata);
1891
1892 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1893 sdata->user_power_level = local->user_power_level;
1894
1895 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1896
1897 /* setup type-dependent data */
1898 ieee80211_setup_sdata(sdata, type);
1899
1900 if (ndev) {
1901 if (params) {
1902 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1903 if (type == NL80211_IFTYPE_STATION)
1904 sdata->u.mgd.use_4addr = params->use_4addr;
1905 }
1906
1907 ndev->features |= local->hw.netdev_features;
1908
1909 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1910
1911 /* MTU range: 256 - 2304 */
1912 ndev->min_mtu = 256;
1913 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1914
1915 ret = register_netdevice(ndev);
1916 if (ret) {
1917 ieee80211_if_free(ndev);
1918 return ret;
1919 }
1920 }
1921
1922 mutex_lock(&local->iflist_mtx);
1923 list_add_tail_rcu(&sdata->list, &local->interfaces);
1924 mutex_unlock(&local->iflist_mtx);
1925
1926 if (new_wdev)
1927 *new_wdev = &sdata->wdev;
1928
1929 return 0;
1930 }
1931
1932 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1933 {
1934 ASSERT_RTNL();
1935
1936 mutex_lock(&sdata->local->iflist_mtx);
1937 list_del_rcu(&sdata->list);
1938 mutex_unlock(&sdata->local->iflist_mtx);
1939
1940 synchronize_rcu();
1941
1942 if (sdata->dev) {
1943 unregister_netdevice(sdata->dev);
1944 } else {
1945 cfg80211_unregister_wdev(&sdata->wdev);
1946 ieee80211_teardown_sdata(sdata);
1947 kfree(sdata);
1948 }
1949 }
1950
1951 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1952 {
1953 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1954 return;
1955 ieee80211_do_stop(sdata, true);
1956 }
1957
1958 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1959 {
1960 struct ieee80211_sub_if_data *sdata, *tmp;
1961 LIST_HEAD(unreg_list);
1962 LIST_HEAD(wdev_list);
1963
1964 ASSERT_RTNL();
1965
1966 /* Before destroying the interfaces, make sure they're all stopped so
1967 * that the hardware is stopped. Otherwise, the driver might still be
1968 * iterating the interfaces during the shutdown, e.g. from a worker
1969 * or from RX processing or similar, and if it does so (using atomic
1970 * iteration) while we're manipulating the list, the iteration will
1971 * crash.
1972 *
1973 * After this, the hardware should be stopped and the driver should
1974 * have stopped all of its activities, so that we can do RCU-unaware
1975 * manipulations of the interface list below.
1976 */
1977 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1978
1979 WARN(local->open_count, "%s: open count remains %d\n",
1980 wiphy_name(local->hw.wiphy), local->open_count);
1981
1982 mutex_lock(&local->iflist_mtx);
1983 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1984 list_del(&sdata->list);
1985
1986 if (sdata->dev)
1987 unregister_netdevice_queue(sdata->dev, &unreg_list);
1988 else
1989 list_add(&sdata->list, &wdev_list);
1990 }
1991 mutex_unlock(&local->iflist_mtx);
1992 unregister_netdevice_many(&unreg_list);
1993
1994 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1995 list_del(&sdata->list);
1996 cfg80211_unregister_wdev(&sdata->wdev);
1997 kfree(sdata);
1998 }
1999 }
2000
2001 static int netdev_notify(struct notifier_block *nb,
2002 unsigned long state, void *ptr)
2003 {
2004 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2005 struct ieee80211_sub_if_data *sdata;
2006
2007 if (state != NETDEV_CHANGENAME)
2008 return NOTIFY_DONE;
2009
2010 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2011 return NOTIFY_DONE;
2012
2013 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2014 return NOTIFY_DONE;
2015
2016 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2017 memcpy(sdata->name, dev->name, IFNAMSIZ);
2018 ieee80211_debugfs_rename_netdev(sdata);
2019
2020 return NOTIFY_OK;
2021 }
2022
2023 static struct notifier_block mac80211_netdev_notifier = {
2024 .notifier_call = netdev_notify,
2025 };
2026
2027 int ieee80211_iface_init(void)
2028 {
2029 return register_netdevice_notifier(&mac80211_netdev_notifier);
2030 }
2031
2032 void ieee80211_iface_exit(void)
2033 {
2034 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2035 }
2036
2037 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2038 {
2039 if (sdata->vif.type == NL80211_IFTYPE_AP)
2040 atomic_inc(&sdata->u.ap.num_mcast_sta);
2041 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2042 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2043 }
2044
2045 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2046 {
2047 if (sdata->vif.type == NL80211_IFTYPE_AP)
2048 atomic_dec(&sdata->u.ap.num_mcast_sta);
2049 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2050 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2051 }
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