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mac80211: fix virtual monitor interface locking
[deliverable/linux.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling (except master interface)
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 int power;
49
50 rcu_read_lock();
51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 if (!chanctx_conf) {
53 rcu_read_unlock();
54 return false;
55 }
56
57 power = chanctx_conf->def.chan->max_power;
58 rcu_read_unlock();
59
60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 power = min(power, sdata->user_power_level);
62
63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->ap_power_level);
65
66 if (power != sdata->vif.bss_conf.txpower) {
67 sdata->vif.bss_conf.txpower = power;
68 ieee80211_hw_config(sdata->local, 0);
69 return true;
70 }
71
72 return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 if (__ieee80211_recalc_txpower(sdata))
78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 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 drv_flush(local, false);
96
97 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 void ieee80211_recalc_idle(struct ieee80211_local *local)
102 {
103 bool working = false, scanning, active;
104 unsigned int led_trig_start = 0, led_trig_stop = 0;
105 struct ieee80211_roc_work *roc;
106 u32 change;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = !list_empty(&local->chanctx_list) || local->monitors;
111
112 if (!local->ops->remain_on_channel) {
113 list_for_each_entry(roc, &local->roc_list, list) {
114 working = true;
115 break;
116 }
117 }
118
119 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121
122 if (working || scanning)
123 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124 else
125 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126
127 if (active)
128 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129 else
130 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131
132 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133
134 if (working || scanning || active)
135 change = ieee80211_idle_off(local);
136 else
137 change = ieee80211_idle_on(local);
138 if (change)
139 ieee80211_hw_config(local, change);
140 }
141
142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
143 {
144 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
145 return -EINVAL;
146
147 dev->mtu = new_mtu;
148 return 0;
149 }
150
151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
152 {
153 struct ieee80211_sub_if_data *sdata;
154 u64 new, mask, tmp;
155 u8 *m;
156 int ret = 0;
157
158 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
159 return 0;
160
161 m = addr;
162 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
163 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
164 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
165
166 m = local->hw.wiphy->addr_mask;
167 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171
172 mutex_lock(&local->iflist_mtx);
173 list_for_each_entry(sdata, &local->interfaces, list) {
174 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
175 continue;
176
177 m = sdata->vif.addr;
178 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181
182 if ((new & ~mask) != (tmp & ~mask)) {
183 ret = -EINVAL;
184 break;
185 }
186 }
187 mutex_unlock(&local->iflist_mtx);
188
189 return ret;
190 }
191
192 static int ieee80211_change_mac(struct net_device *dev, void *addr)
193 {
194 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
195 struct sockaddr *sa = addr;
196 int ret;
197
198 if (ieee80211_sdata_running(sdata))
199 return -EBUSY;
200
201 ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
202 if (ret)
203 return ret;
204
205 ret = eth_mac_addr(dev, sa);
206
207 if (ret == 0)
208 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
209
210 return ret;
211 }
212
213 static inline int identical_mac_addr_allowed(int type1, int type2)
214 {
215 return type1 == NL80211_IFTYPE_MONITOR ||
216 type2 == NL80211_IFTYPE_MONITOR ||
217 type1 == NL80211_IFTYPE_P2P_DEVICE ||
218 type2 == NL80211_IFTYPE_P2P_DEVICE ||
219 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
220 (type1 == NL80211_IFTYPE_WDS &&
221 (type2 == NL80211_IFTYPE_WDS ||
222 type2 == NL80211_IFTYPE_AP)) ||
223 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
224 (type1 == NL80211_IFTYPE_AP_VLAN &&
225 (type2 == NL80211_IFTYPE_AP ||
226 type2 == NL80211_IFTYPE_AP_VLAN));
227 }
228
229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
230 enum nl80211_iftype iftype)
231 {
232 struct ieee80211_local *local = sdata->local;
233 struct ieee80211_sub_if_data *nsdata;
234
235 ASSERT_RTNL();
236
237 /* we hold the RTNL here so can safely walk the list */
238 list_for_each_entry(nsdata, &local->interfaces, list) {
239 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
240 /*
241 * Allow only a single IBSS interface to be up at any
242 * time. This is restricted because beacon distribution
243 * cannot work properly if both are in the same IBSS.
244 *
245 * To remove this restriction we'd have to disallow them
246 * from setting the same SSID on different IBSS interfaces
247 * belonging to the same hardware. Then, however, we're
248 * faced with having to adopt two different TSF timers...
249 */
250 if (iftype == NL80211_IFTYPE_ADHOC &&
251 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
252 return -EBUSY;
253
254 /*
255 * The remaining checks are only performed for interfaces
256 * with the same MAC address.
257 */
258 if (!ether_addr_equal(sdata->vif.addr,
259 nsdata->vif.addr))
260 continue;
261
262 /*
263 * check whether it may have the same address
264 */
265 if (!identical_mac_addr_allowed(iftype,
266 nsdata->vif.type))
267 return -ENOTUNIQ;
268
269 /*
270 * can only add VLANs to enabled APs
271 */
272 if (iftype == NL80211_IFTYPE_AP_VLAN &&
273 nsdata->vif.type == NL80211_IFTYPE_AP)
274 sdata->bss = &nsdata->u.ap;
275 }
276 }
277
278 return 0;
279 }
280
281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
282 {
283 int n_queues = sdata->local->hw.queues;
284 int i;
285
286 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
287 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
288 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
289 IEEE80211_INVAL_HW_QUEUE))
290 return -EINVAL;
291 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
292 n_queues))
293 return -EINVAL;
294 }
295 }
296
297 if ((sdata->vif.type != NL80211_IFTYPE_AP &&
298 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
299 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
300 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
301 return 0;
302 }
303
304 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
305 return -EINVAL;
306
307 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
308 return -EINVAL;
309
310 return 0;
311 }
312
313 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
314 const int offset)
315 {
316 struct ieee80211_local *local = sdata->local;
317 u32 flags = sdata->u.mntr_flags;
318
319 #define ADJUST(_f, _s) do { \
320 if (flags & MONITOR_FLAG_##_f) \
321 local->fif_##_s += offset; \
322 } while (0)
323
324 ADJUST(FCSFAIL, fcsfail);
325 ADJUST(PLCPFAIL, plcpfail);
326 ADJUST(CONTROL, control);
327 ADJUST(CONTROL, pspoll);
328 ADJUST(OTHER_BSS, other_bss);
329
330 #undef ADJUST
331 }
332
333 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
334 {
335 struct ieee80211_local *local = sdata->local;
336 int i;
337
338 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
339 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
340 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
341 else if (local->hw.queues >= IEEE80211_NUM_ACS)
342 sdata->vif.hw_queue[i] = i;
343 else
344 sdata->vif.hw_queue[i] = 0;
345 }
346 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
347 }
348
349 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
350 {
351 struct ieee80211_sub_if_data *sdata;
352 int ret;
353
354 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
355 return 0;
356
357 ASSERT_RTNL();
358
359 if (local->monitor_sdata)
360 return 0;
361
362 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
363 if (!sdata)
364 return -ENOMEM;
365
366 /* set up data */
367 sdata->local = local;
368 sdata->vif.type = NL80211_IFTYPE_MONITOR;
369 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
370 wiphy_name(local->hw.wiphy));
371
372 ieee80211_set_default_queues(sdata);
373
374 ret = drv_add_interface(local, sdata);
375 if (WARN_ON(ret)) {
376 /* ok .. stupid driver, it asked for this! */
377 kfree(sdata);
378 return ret;
379 }
380
381 ret = ieee80211_check_queues(sdata);
382 if (ret) {
383 kfree(sdata);
384 return ret;
385 }
386
387 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
388 IEEE80211_CHANCTX_EXCLUSIVE);
389 if (ret) {
390 drv_remove_interface(local, sdata);
391 kfree(sdata);
392 return ret;
393 }
394
395 mutex_lock(&local->iflist_mtx);
396 rcu_assign_pointer(local->monitor_sdata, sdata);
397 mutex_unlock(&local->iflist_mtx);
398
399 return 0;
400 }
401
402 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
403 {
404 struct ieee80211_sub_if_data *sdata;
405
406 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
407 return;
408
409 ASSERT_RTNL();
410
411 mutex_lock(&local->iflist_mtx);
412
413 sdata = rcu_dereference_protected(local->monitor_sdata,
414 lockdep_is_held(&local->iflist_mtx));
415 if (!sdata) {
416 mutex_unlock(&local->iflist_mtx);
417 return;
418 }
419
420 rcu_assign_pointer(local->monitor_sdata, NULL);
421 mutex_unlock(&local->iflist_mtx);
422
423 synchronize_net();
424
425 ieee80211_vif_release_channel(sdata);
426
427 drv_remove_interface(local, sdata);
428
429 kfree(sdata);
430 }
431
432 /*
433 * NOTE: Be very careful when changing this function, it must NOT return
434 * an error on interface type changes that have been pre-checked, so most
435 * checks should be in ieee80211_check_concurrent_iface.
436 */
437 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
438 {
439 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
440 struct net_device *dev = wdev->netdev;
441 struct ieee80211_local *local = sdata->local;
442 struct sta_info *sta;
443 u32 changed = 0;
444 int res;
445 u32 hw_reconf_flags = 0;
446
447 switch (sdata->vif.type) {
448 case NL80211_IFTYPE_WDS:
449 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
450 return -ENOLINK;
451 break;
452 case NL80211_IFTYPE_AP_VLAN: {
453 struct ieee80211_sub_if_data *master;
454
455 if (!sdata->bss)
456 return -ENOLINK;
457
458 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
459
460 master = container_of(sdata->bss,
461 struct ieee80211_sub_if_data, u.ap);
462 sdata->control_port_protocol =
463 master->control_port_protocol;
464 sdata->control_port_no_encrypt =
465 master->control_port_no_encrypt;
466 break;
467 }
468 case NL80211_IFTYPE_AP:
469 sdata->bss = &sdata->u.ap;
470 break;
471 case NL80211_IFTYPE_MESH_POINT:
472 case NL80211_IFTYPE_STATION:
473 case NL80211_IFTYPE_MONITOR:
474 case NL80211_IFTYPE_ADHOC:
475 case NL80211_IFTYPE_P2P_DEVICE:
476 /* no special treatment */
477 break;
478 case NL80211_IFTYPE_UNSPECIFIED:
479 case NUM_NL80211_IFTYPES:
480 case NL80211_IFTYPE_P2P_CLIENT:
481 case NL80211_IFTYPE_P2P_GO:
482 /* cannot happen */
483 WARN_ON(1);
484 break;
485 }
486
487 if (local->open_count == 0) {
488 res = drv_start(local);
489 if (res)
490 goto err_del_bss;
491 if (local->ops->napi_poll)
492 napi_enable(&local->napi);
493 /* we're brought up, everything changes */
494 hw_reconf_flags = ~0;
495 ieee80211_led_radio(local, true);
496 ieee80211_mod_tpt_led_trig(local,
497 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
498 }
499
500 /*
501 * Copy the hopefully now-present MAC address to
502 * this interface, if it has the special null one.
503 */
504 if (dev && is_zero_ether_addr(dev->dev_addr)) {
505 memcpy(dev->dev_addr,
506 local->hw.wiphy->perm_addr,
507 ETH_ALEN);
508 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
509
510 if (!is_valid_ether_addr(dev->dev_addr)) {
511 res = -EADDRNOTAVAIL;
512 goto err_stop;
513 }
514 }
515
516 switch (sdata->vif.type) {
517 case NL80211_IFTYPE_AP_VLAN:
518 /* no need to tell driver, but set carrier and chanctx */
519 if (rtnl_dereference(sdata->bss->beacon)) {
520 ieee80211_vif_vlan_copy_chanctx(sdata);
521 netif_carrier_on(dev);
522 } else {
523 netif_carrier_off(dev);
524 }
525 break;
526 case NL80211_IFTYPE_MONITOR:
527 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
528 local->cooked_mntrs++;
529 break;
530 }
531
532 if (local->monitors == 0 && local->open_count == 0) {
533 res = ieee80211_add_virtual_monitor(local);
534 if (res)
535 goto err_stop;
536 }
537
538 /* must be before the call to ieee80211_configure_filter */
539 local->monitors++;
540 if (local->monitors == 1) {
541 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
542 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
543 }
544
545 ieee80211_adjust_monitor_flags(sdata, 1);
546 ieee80211_configure_filter(local);
547 mutex_lock(&local->mtx);
548 ieee80211_recalc_idle(local);
549 mutex_unlock(&local->mtx);
550
551 netif_carrier_on(dev);
552 break;
553 default:
554 if (coming_up) {
555 ieee80211_del_virtual_monitor(local);
556
557 res = drv_add_interface(local, sdata);
558 if (res)
559 goto err_stop;
560 res = ieee80211_check_queues(sdata);
561 if (res)
562 goto err_del_interface;
563 }
564
565 drv_add_interface_debugfs(local, sdata);
566
567 if (sdata->vif.type == NL80211_IFTYPE_AP) {
568 local->fif_pspoll++;
569 local->fif_probe_req++;
570
571 ieee80211_configure_filter(local);
572 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
573 local->fif_probe_req++;
574 }
575
576 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
577 changed |= ieee80211_reset_erp_info(sdata);
578 ieee80211_bss_info_change_notify(sdata, changed);
579
580 switch (sdata->vif.type) {
581 case NL80211_IFTYPE_STATION:
582 case NL80211_IFTYPE_ADHOC:
583 case NL80211_IFTYPE_AP:
584 case NL80211_IFTYPE_MESH_POINT:
585 netif_carrier_off(dev);
586 break;
587 case NL80211_IFTYPE_WDS:
588 case NL80211_IFTYPE_P2P_DEVICE:
589 break;
590 default:
591 netif_carrier_on(dev);
592 }
593
594 /*
595 * set default queue parameters so drivers don't
596 * need to initialise the hardware if the hardware
597 * doesn't start up with sane defaults
598 */
599 ieee80211_set_wmm_default(sdata, true);
600 }
601
602 set_bit(SDATA_STATE_RUNNING, &sdata->state);
603
604 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
605 /* Create STA entry for the WDS peer */
606 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
607 GFP_KERNEL);
608 if (!sta) {
609 res = -ENOMEM;
610 goto err_del_interface;
611 }
612
613 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
614 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
615 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
616
617 res = sta_info_insert(sta);
618 if (res) {
619 /* STA has been freed */
620 goto err_del_interface;
621 }
622
623 rate_control_rate_init(sta);
624 netif_carrier_on(dev);
625 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
626 rcu_assign_pointer(local->p2p_sdata, sdata);
627 }
628
629 /*
630 * set_multicast_list will be invoked by the networking core
631 * which will check whether any increments here were done in
632 * error and sync them down to the hardware as filter flags.
633 */
634 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
635 atomic_inc(&local->iff_allmultis);
636
637 if (sdata->flags & IEEE80211_SDATA_PROMISC)
638 atomic_inc(&local->iff_promiscs);
639
640 if (coming_up)
641 local->open_count++;
642
643 if (hw_reconf_flags)
644 ieee80211_hw_config(local, hw_reconf_flags);
645
646 ieee80211_recalc_ps(local, -1);
647
648 if (dev)
649 netif_tx_start_all_queues(dev);
650
651 return 0;
652 err_del_interface:
653 drv_remove_interface(local, sdata);
654 err_stop:
655 if (!local->open_count)
656 drv_stop(local);
657 err_del_bss:
658 sdata->bss = NULL;
659 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
660 list_del(&sdata->u.vlan.list);
661 /* might already be clear but that doesn't matter */
662 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
663 return res;
664 }
665
666 static int ieee80211_open(struct net_device *dev)
667 {
668 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
669 int err;
670
671 /* fail early if user set an invalid address */
672 if (!is_valid_ether_addr(dev->dev_addr))
673 return -EADDRNOTAVAIL;
674
675 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
676 if (err)
677 return err;
678
679 return ieee80211_do_open(&sdata->wdev, true);
680 }
681
682 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
683 bool going_down)
684 {
685 struct ieee80211_local *local = sdata->local;
686 unsigned long flags;
687 struct sk_buff *skb, *tmp;
688 u32 hw_reconf_flags = 0;
689 int i, flushed;
690 struct ps_data *ps;
691
692 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
693
694 if (rcu_access_pointer(local->scan_sdata) == sdata)
695 ieee80211_scan_cancel(local);
696
697 /*
698 * Stop TX on this interface first.
699 */
700 if (sdata->dev)
701 netif_tx_stop_all_queues(sdata->dev);
702
703 ieee80211_roc_purge(sdata);
704
705 if (sdata->vif.type == NL80211_IFTYPE_STATION)
706 ieee80211_mgd_stop(sdata);
707
708 /*
709 * Remove all stations associated with this interface.
710 *
711 * This must be done before calling ops->remove_interface()
712 * because otherwise we can later invoke ops->sta_notify()
713 * whenever the STAs are removed, and that invalidates driver
714 * assumptions about always getting a vif pointer that is valid
715 * (because if we remove a STA after ops->remove_interface()
716 * the driver will have removed the vif info already!)
717 *
718 * This is relevant only in WDS mode, in all other modes we've
719 * already removed all stations when disconnecting or similar,
720 * so warn otherwise.
721 *
722 * We call sta_info_flush_cleanup() later, to combine RCU waits.
723 */
724 flushed = sta_info_flush_defer(sdata);
725 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
726 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
727
728 /*
729 * Don't count this interface for promisc/allmulti while it
730 * is down. dev_mc_unsync() will invoke set_multicast_list
731 * on the master interface which will sync these down to the
732 * hardware as filter flags.
733 */
734 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
735 atomic_dec(&local->iff_allmultis);
736
737 if (sdata->flags & IEEE80211_SDATA_PROMISC)
738 atomic_dec(&local->iff_promiscs);
739
740 if (sdata->vif.type == NL80211_IFTYPE_AP) {
741 local->fif_pspoll--;
742 local->fif_probe_req--;
743 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
744 local->fif_probe_req--;
745 }
746
747 if (sdata->dev) {
748 netif_addr_lock_bh(sdata->dev);
749 spin_lock_bh(&local->filter_lock);
750 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
751 sdata->dev->addr_len);
752 spin_unlock_bh(&local->filter_lock);
753 netif_addr_unlock_bh(sdata->dev);
754
755 ieee80211_configure_filter(local);
756 }
757
758 del_timer_sync(&local->dynamic_ps_timer);
759 cancel_work_sync(&local->dynamic_ps_enable_work);
760
761 cancel_work_sync(&sdata->recalc_smps);
762
763 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
764
765 if (sdata->wdev.cac_started) {
766 mutex_lock(&local->iflist_mtx);
767 ieee80211_vif_release_channel(sdata);
768 mutex_unlock(&local->iflist_mtx);
769 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
770 GFP_KERNEL);
771 }
772
773 /* APs need special treatment */
774 if (sdata->vif.type == NL80211_IFTYPE_AP) {
775 struct ieee80211_sub_if_data *vlan, *tmpsdata;
776
777 /* down all dependent devices, that is VLANs */
778 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
779 u.vlan.list)
780 dev_close(vlan->dev);
781 WARN_ON(!list_empty(&sdata->u.ap.vlans));
782 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
783 /* remove all packets in parent bc_buf pointing to this dev */
784 ps = &sdata->bss->ps;
785
786 spin_lock_irqsave(&ps->bc_buf.lock, flags);
787 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
788 if (skb->dev == sdata->dev) {
789 __skb_unlink(skb, &ps->bc_buf);
790 local->total_ps_buffered--;
791 ieee80211_free_txskb(&local->hw, skb);
792 }
793 }
794 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
795 }
796
797 if (going_down)
798 local->open_count--;
799
800 switch (sdata->vif.type) {
801 case NL80211_IFTYPE_AP_VLAN:
802 list_del(&sdata->u.vlan.list);
803 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
804 /* no need to tell driver */
805 break;
806 case NL80211_IFTYPE_MONITOR:
807 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
808 local->cooked_mntrs--;
809 break;
810 }
811
812 local->monitors--;
813 if (local->monitors == 0) {
814 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
815 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
816 ieee80211_del_virtual_monitor(local);
817 }
818
819 ieee80211_adjust_monitor_flags(sdata, -1);
820 ieee80211_configure_filter(local);
821 mutex_lock(&local->mtx);
822 ieee80211_recalc_idle(local);
823 mutex_unlock(&local->mtx);
824 break;
825 case NL80211_IFTYPE_P2P_DEVICE:
826 /* relies on synchronize_rcu() below */
827 rcu_assign_pointer(local->p2p_sdata, NULL);
828 /* fall through */
829 default:
830 cancel_work_sync(&sdata->work);
831 /*
832 * When we get here, the interface is marked down.
833 *
834 * sta_info_flush_cleanup() requires rcu_barrier()
835 * first to wait for the station call_rcu() calls
836 * to complete, here we need at least sychronize_rcu()
837 * it to wait for the RX path in case it is using the
838 * interface and enqueuing frames at this very time on
839 * another CPU.
840 */
841 rcu_barrier();
842 sta_info_flush_cleanup(sdata);
843
844 skb_queue_purge(&sdata->skb_queue);
845
846 /*
847 * Free all remaining keys, there shouldn't be any,
848 * except maybe group keys in AP more or WDS?
849 */
850 ieee80211_free_keys(sdata);
851
852 drv_remove_interface_debugfs(local, sdata);
853
854 if (going_down)
855 drv_remove_interface(local, sdata);
856 }
857
858 sdata->bss = NULL;
859
860 ieee80211_recalc_ps(local, -1);
861
862 if (local->open_count == 0) {
863 if (local->ops->napi_poll)
864 napi_disable(&local->napi);
865 ieee80211_clear_tx_pending(local);
866 ieee80211_stop_device(local);
867
868 /* no reconfiguring after stop! */
869 hw_reconf_flags = 0;
870 }
871
872 /* do after stop to avoid reconfiguring when we stop anyway */
873 if (hw_reconf_flags)
874 ieee80211_hw_config(local, hw_reconf_flags);
875
876 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
877 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
878 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
879 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
880 if (info->control.vif == &sdata->vif) {
881 __skb_unlink(skb, &local->pending[i]);
882 ieee80211_free_txskb(&local->hw, skb);
883 }
884 }
885 }
886 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
887
888 if (local->monitors == local->open_count && local->monitors > 0)
889 ieee80211_add_virtual_monitor(local);
890 }
891
892 static int ieee80211_stop(struct net_device *dev)
893 {
894 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
895
896 ieee80211_do_stop(sdata, true);
897
898 return 0;
899 }
900
901 static void ieee80211_set_multicast_list(struct net_device *dev)
902 {
903 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
904 struct ieee80211_local *local = sdata->local;
905 int allmulti, promisc, sdata_allmulti, sdata_promisc;
906
907 allmulti = !!(dev->flags & IFF_ALLMULTI);
908 promisc = !!(dev->flags & IFF_PROMISC);
909 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
910 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
911
912 if (allmulti != sdata_allmulti) {
913 if (dev->flags & IFF_ALLMULTI)
914 atomic_inc(&local->iff_allmultis);
915 else
916 atomic_dec(&local->iff_allmultis);
917 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
918 }
919
920 if (promisc != sdata_promisc) {
921 if (dev->flags & IFF_PROMISC)
922 atomic_inc(&local->iff_promiscs);
923 else
924 atomic_dec(&local->iff_promiscs);
925 sdata->flags ^= IEEE80211_SDATA_PROMISC;
926 }
927 spin_lock_bh(&local->filter_lock);
928 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
929 spin_unlock_bh(&local->filter_lock);
930 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
931 }
932
933 /*
934 * Called when the netdev is removed or, by the code below, before
935 * the interface type changes.
936 */
937 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
938 {
939 int flushed;
940 int i;
941
942 /* free extra data */
943 ieee80211_free_keys(sdata);
944
945 ieee80211_debugfs_remove_netdev(sdata);
946
947 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
948 __skb_queue_purge(&sdata->fragments[i].skb_list);
949 sdata->fragment_next = 0;
950
951 if (ieee80211_vif_is_mesh(&sdata->vif))
952 mesh_rmc_free(sdata);
953
954 flushed = sta_info_flush(sdata);
955 WARN_ON(flushed);
956 }
957
958 static void ieee80211_uninit(struct net_device *dev)
959 {
960 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
961 }
962
963 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
964 struct sk_buff *skb)
965 {
966 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
967 }
968
969 static const struct net_device_ops ieee80211_dataif_ops = {
970 .ndo_open = ieee80211_open,
971 .ndo_stop = ieee80211_stop,
972 .ndo_uninit = ieee80211_uninit,
973 .ndo_start_xmit = ieee80211_subif_start_xmit,
974 .ndo_set_rx_mode = ieee80211_set_multicast_list,
975 .ndo_change_mtu = ieee80211_change_mtu,
976 .ndo_set_mac_address = ieee80211_change_mac,
977 .ndo_select_queue = ieee80211_netdev_select_queue,
978 };
979
980 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
981 struct sk_buff *skb)
982 {
983 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
984 struct ieee80211_local *local = sdata->local;
985 struct ieee80211_hdr *hdr;
986 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
987
988 if (local->hw.queues < IEEE80211_NUM_ACS)
989 return 0;
990
991 if (skb->len < 4 ||
992 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
993 return 0; /* doesn't matter, frame will be dropped */
994
995 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
996
997 return ieee80211_select_queue_80211(sdata, skb, hdr);
998 }
999
1000 static const struct net_device_ops ieee80211_monitorif_ops = {
1001 .ndo_open = ieee80211_open,
1002 .ndo_stop = ieee80211_stop,
1003 .ndo_uninit = ieee80211_uninit,
1004 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1005 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1006 .ndo_change_mtu = ieee80211_change_mtu,
1007 .ndo_set_mac_address = eth_mac_addr,
1008 .ndo_select_queue = ieee80211_monitor_select_queue,
1009 };
1010
1011 static void ieee80211_if_setup(struct net_device *dev)
1012 {
1013 ether_setup(dev);
1014 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1015 dev->netdev_ops = &ieee80211_dataif_ops;
1016 dev->destructor = free_netdev;
1017 }
1018
1019 static void ieee80211_iface_work(struct work_struct *work)
1020 {
1021 struct ieee80211_sub_if_data *sdata =
1022 container_of(work, struct ieee80211_sub_if_data, work);
1023 struct ieee80211_local *local = sdata->local;
1024 struct sk_buff *skb;
1025 struct sta_info *sta;
1026 struct ieee80211_ra_tid *ra_tid;
1027
1028 if (!ieee80211_sdata_running(sdata))
1029 return;
1030
1031 if (local->scanning)
1032 return;
1033
1034 /*
1035 * ieee80211_queue_work() should have picked up most cases,
1036 * here we'll pick the rest.
1037 */
1038 if (WARN(local->suspended,
1039 "interface work scheduled while going to suspend\n"))
1040 return;
1041
1042 /* first process frames */
1043 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1044 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1045
1046 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1047 ra_tid = (void *)&skb->cb;
1048 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1049 ra_tid->tid);
1050 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1051 ra_tid = (void *)&skb->cb;
1052 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1053 ra_tid->tid);
1054 } else if (ieee80211_is_action(mgmt->frame_control) &&
1055 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1056 int len = skb->len;
1057
1058 mutex_lock(&local->sta_mtx);
1059 sta = sta_info_get_bss(sdata, mgmt->sa);
1060 if (sta) {
1061 switch (mgmt->u.action.u.addba_req.action_code) {
1062 case WLAN_ACTION_ADDBA_REQ:
1063 ieee80211_process_addba_request(
1064 local, sta, mgmt, len);
1065 break;
1066 case WLAN_ACTION_ADDBA_RESP:
1067 ieee80211_process_addba_resp(local, sta,
1068 mgmt, len);
1069 break;
1070 case WLAN_ACTION_DELBA:
1071 ieee80211_process_delba(sdata, sta,
1072 mgmt, len);
1073 break;
1074 default:
1075 WARN_ON(1);
1076 break;
1077 }
1078 }
1079 mutex_unlock(&local->sta_mtx);
1080 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1081 struct ieee80211_hdr *hdr = (void *)mgmt;
1082 /*
1083 * So the frame isn't mgmt, but frame_control
1084 * is at the right place anyway, of course, so
1085 * the if statement is correct.
1086 *
1087 * Warn if we have other data frame types here,
1088 * they must not get here.
1089 */
1090 WARN_ON(hdr->frame_control &
1091 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1092 WARN_ON(!(hdr->seq_ctrl &
1093 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1094 /*
1095 * This was a fragment of a frame, received while
1096 * a block-ack session was active. That cannot be
1097 * right, so terminate the session.
1098 */
1099 mutex_lock(&local->sta_mtx);
1100 sta = sta_info_get_bss(sdata, mgmt->sa);
1101 if (sta) {
1102 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1103 IEEE80211_QOS_CTL_TID_MASK;
1104
1105 __ieee80211_stop_rx_ba_session(
1106 sta, tid, WLAN_BACK_RECIPIENT,
1107 WLAN_REASON_QSTA_REQUIRE_SETUP,
1108 true);
1109 }
1110 mutex_unlock(&local->sta_mtx);
1111 } else switch (sdata->vif.type) {
1112 case NL80211_IFTYPE_STATION:
1113 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1114 break;
1115 case NL80211_IFTYPE_ADHOC:
1116 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1117 break;
1118 case NL80211_IFTYPE_MESH_POINT:
1119 if (!ieee80211_vif_is_mesh(&sdata->vif))
1120 break;
1121 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1122 break;
1123 default:
1124 WARN(1, "frame for unexpected interface type");
1125 break;
1126 }
1127
1128 kfree_skb(skb);
1129 }
1130
1131 /* then other type-dependent work */
1132 switch (sdata->vif.type) {
1133 case NL80211_IFTYPE_STATION:
1134 ieee80211_sta_work(sdata);
1135 break;
1136 case NL80211_IFTYPE_ADHOC:
1137 ieee80211_ibss_work(sdata);
1138 break;
1139 case NL80211_IFTYPE_MESH_POINT:
1140 if (!ieee80211_vif_is_mesh(&sdata->vif))
1141 break;
1142 ieee80211_mesh_work(sdata);
1143 break;
1144 default:
1145 break;
1146 }
1147 }
1148
1149 static void ieee80211_recalc_smps_work(struct work_struct *work)
1150 {
1151 struct ieee80211_sub_if_data *sdata =
1152 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1153
1154 ieee80211_recalc_smps(sdata);
1155 }
1156
1157 /*
1158 * Helper function to initialise an interface to a specific type.
1159 */
1160 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1161 enum nl80211_iftype type)
1162 {
1163 /* clear type-dependent union */
1164 memset(&sdata->u, 0, sizeof(sdata->u));
1165
1166 /* and set some type-dependent values */
1167 sdata->vif.type = type;
1168 sdata->vif.p2p = false;
1169 sdata->wdev.iftype = type;
1170
1171 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1172 sdata->control_port_no_encrypt = false;
1173
1174 sdata->noack_map = 0;
1175
1176 /* only monitor/p2p-device differ */
1177 if (sdata->dev) {
1178 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1179 sdata->dev->type = ARPHRD_ETHER;
1180 }
1181
1182 skb_queue_head_init(&sdata->skb_queue);
1183 INIT_WORK(&sdata->work, ieee80211_iface_work);
1184 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1185
1186 switch (type) {
1187 case NL80211_IFTYPE_P2P_GO:
1188 type = NL80211_IFTYPE_AP;
1189 sdata->vif.type = type;
1190 sdata->vif.p2p = true;
1191 /* fall through */
1192 case NL80211_IFTYPE_AP:
1193 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1194 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1195 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1196 break;
1197 case NL80211_IFTYPE_P2P_CLIENT:
1198 type = NL80211_IFTYPE_STATION;
1199 sdata->vif.type = type;
1200 sdata->vif.p2p = true;
1201 /* fall through */
1202 case NL80211_IFTYPE_STATION:
1203 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1204 ieee80211_sta_setup_sdata(sdata);
1205 break;
1206 case NL80211_IFTYPE_ADHOC:
1207 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1208 ieee80211_ibss_setup_sdata(sdata);
1209 break;
1210 case NL80211_IFTYPE_MESH_POINT:
1211 if (ieee80211_vif_is_mesh(&sdata->vif))
1212 ieee80211_mesh_init_sdata(sdata);
1213 break;
1214 case NL80211_IFTYPE_MONITOR:
1215 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1216 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1217 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1218 MONITOR_FLAG_OTHER_BSS;
1219 break;
1220 case NL80211_IFTYPE_WDS:
1221 sdata->vif.bss_conf.bssid = NULL;
1222 break;
1223 case NL80211_IFTYPE_AP_VLAN:
1224 break;
1225 case NL80211_IFTYPE_P2P_DEVICE:
1226 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1227 break;
1228 case NL80211_IFTYPE_UNSPECIFIED:
1229 case NUM_NL80211_IFTYPES:
1230 BUG();
1231 break;
1232 }
1233
1234 ieee80211_debugfs_add_netdev(sdata);
1235 }
1236
1237 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1238 enum nl80211_iftype type)
1239 {
1240 struct ieee80211_local *local = sdata->local;
1241 int ret, err;
1242 enum nl80211_iftype internal_type = type;
1243 bool p2p = false;
1244
1245 ASSERT_RTNL();
1246
1247 if (!local->ops->change_interface)
1248 return -EBUSY;
1249
1250 switch (sdata->vif.type) {
1251 case NL80211_IFTYPE_AP:
1252 case NL80211_IFTYPE_STATION:
1253 case NL80211_IFTYPE_ADHOC:
1254 /*
1255 * Could maybe also all others here?
1256 * Just not sure how that interacts
1257 * with the RX/config path e.g. for
1258 * mesh.
1259 */
1260 break;
1261 default:
1262 return -EBUSY;
1263 }
1264
1265 switch (type) {
1266 case NL80211_IFTYPE_AP:
1267 case NL80211_IFTYPE_STATION:
1268 case NL80211_IFTYPE_ADHOC:
1269 /*
1270 * Could probably support everything
1271 * but WDS here (WDS do_open can fail
1272 * under memory pressure, which this
1273 * code isn't prepared to handle).
1274 */
1275 break;
1276 case NL80211_IFTYPE_P2P_CLIENT:
1277 p2p = true;
1278 internal_type = NL80211_IFTYPE_STATION;
1279 break;
1280 case NL80211_IFTYPE_P2P_GO:
1281 p2p = true;
1282 internal_type = NL80211_IFTYPE_AP;
1283 break;
1284 default:
1285 return -EBUSY;
1286 }
1287
1288 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1289 if (ret)
1290 return ret;
1291
1292 ieee80211_do_stop(sdata, false);
1293
1294 ieee80211_teardown_sdata(sdata);
1295
1296 ret = drv_change_interface(local, sdata, internal_type, p2p);
1297 if (ret)
1298 type = sdata->vif.type;
1299
1300 /*
1301 * Ignore return value here, there's not much we can do since
1302 * the driver changed the interface type internally already.
1303 * The warnings will hopefully make driver authors fix it :-)
1304 */
1305 ieee80211_check_queues(sdata);
1306
1307 ieee80211_setup_sdata(sdata, type);
1308
1309 err = ieee80211_do_open(&sdata->wdev, false);
1310 WARN(err, "type change: do_open returned %d", err);
1311
1312 return ret;
1313 }
1314
1315 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1316 enum nl80211_iftype type)
1317 {
1318 int ret;
1319
1320 ASSERT_RTNL();
1321
1322 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1323 return 0;
1324
1325 if (ieee80211_sdata_running(sdata)) {
1326 ret = ieee80211_runtime_change_iftype(sdata, type);
1327 if (ret)
1328 return ret;
1329 } else {
1330 /* Purge and reset type-dependent state. */
1331 ieee80211_teardown_sdata(sdata);
1332 ieee80211_setup_sdata(sdata, type);
1333 }
1334
1335 /* reset some values that shouldn't be kept across type changes */
1336 sdata->drop_unencrypted = 0;
1337 if (type == NL80211_IFTYPE_STATION)
1338 sdata->u.mgd.use_4addr = false;
1339
1340 return 0;
1341 }
1342
1343 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1344 u8 *perm_addr, enum nl80211_iftype type)
1345 {
1346 struct ieee80211_sub_if_data *sdata;
1347 u64 mask, start, addr, val, inc;
1348 u8 *m;
1349 u8 tmp_addr[ETH_ALEN];
1350 int i;
1351
1352 /* default ... something at least */
1353 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1354
1355 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1356 local->hw.wiphy->n_addresses <= 1)
1357 return;
1358
1359 mutex_lock(&local->iflist_mtx);
1360
1361 switch (type) {
1362 case NL80211_IFTYPE_MONITOR:
1363 /* doesn't matter */
1364 break;
1365 case NL80211_IFTYPE_WDS:
1366 case NL80211_IFTYPE_AP_VLAN:
1367 /* match up with an AP interface */
1368 list_for_each_entry(sdata, &local->interfaces, list) {
1369 if (sdata->vif.type != NL80211_IFTYPE_AP)
1370 continue;
1371 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1372 break;
1373 }
1374 /* keep default if no AP interface present */
1375 break;
1376 case NL80211_IFTYPE_P2P_CLIENT:
1377 case NL80211_IFTYPE_P2P_GO:
1378 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1379 list_for_each_entry(sdata, &local->interfaces, list) {
1380 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1381 continue;
1382 if (!ieee80211_sdata_running(sdata))
1383 continue;
1384 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1385 goto out_unlock;
1386 }
1387 }
1388 /* otherwise fall through */
1389 default:
1390 /* assign a new address if possible -- try n_addresses first */
1391 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1392 bool used = false;
1393
1394 list_for_each_entry(sdata, &local->interfaces, list) {
1395 if (memcmp(local->hw.wiphy->addresses[i].addr,
1396 sdata->vif.addr, ETH_ALEN) == 0) {
1397 used = true;
1398 break;
1399 }
1400 }
1401
1402 if (!used) {
1403 memcpy(perm_addr,
1404 local->hw.wiphy->addresses[i].addr,
1405 ETH_ALEN);
1406 break;
1407 }
1408 }
1409
1410 /* try mask if available */
1411 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1412 break;
1413
1414 m = local->hw.wiphy->addr_mask;
1415 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1416 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1417 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1418
1419 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1420 /* not a contiguous mask ... not handled now! */
1421 pr_info("not contiguous\n");
1422 break;
1423 }
1424
1425 m = local->hw.wiphy->perm_addr;
1426 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1427 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1428 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1429
1430 inc = 1ULL<<__ffs64(mask);
1431 val = (start & mask);
1432 addr = (start & ~mask) | (val & mask);
1433 do {
1434 bool used = false;
1435
1436 tmp_addr[5] = addr >> 0*8;
1437 tmp_addr[4] = addr >> 1*8;
1438 tmp_addr[3] = addr >> 2*8;
1439 tmp_addr[2] = addr >> 3*8;
1440 tmp_addr[1] = addr >> 4*8;
1441 tmp_addr[0] = addr >> 5*8;
1442
1443 val += inc;
1444
1445 list_for_each_entry(sdata, &local->interfaces, list) {
1446 if (memcmp(tmp_addr, sdata->vif.addr,
1447 ETH_ALEN) == 0) {
1448 used = true;
1449 break;
1450 }
1451 }
1452
1453 if (!used) {
1454 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1455 break;
1456 }
1457 addr = (start & ~mask) | (val & mask);
1458 } while (addr != start);
1459
1460 break;
1461 }
1462
1463 out_unlock:
1464 mutex_unlock(&local->iflist_mtx);
1465 }
1466
1467 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1468 {
1469 struct ieee80211_sub_if_data *sdata;
1470
1471 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1472
1473 ieee80211_cleanup_sdata_stas(sdata);
1474 }
1475
1476 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1477 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1478 struct vif_params *params)
1479 {
1480 struct net_device *ndev = NULL;
1481 struct ieee80211_sub_if_data *sdata = NULL;
1482 int ret, i;
1483 int txqs = 1;
1484
1485 ASSERT_RTNL();
1486
1487 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1488 struct wireless_dev *wdev;
1489
1490 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1491 GFP_KERNEL);
1492 if (!sdata)
1493 return -ENOMEM;
1494 wdev = &sdata->wdev;
1495
1496 sdata->dev = NULL;
1497 strlcpy(sdata->name, name, IFNAMSIZ);
1498 ieee80211_assign_perm_addr(local, wdev->address, type);
1499 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1500 } else {
1501 if (local->hw.queues >= IEEE80211_NUM_ACS)
1502 txqs = IEEE80211_NUM_ACS;
1503
1504 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1505 local->hw.vif_data_size,
1506 name, ieee80211_if_setup, txqs, 1);
1507 if (!ndev)
1508 return -ENOMEM;
1509 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1510
1511 ndev->needed_headroom = local->tx_headroom +
1512 4*6 /* four MAC addresses */
1513 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1514 + 6 /* mesh */
1515 + 8 /* rfc1042/bridge tunnel */
1516 - ETH_HLEN /* ethernet hard_header_len */
1517 + IEEE80211_ENCRYPT_HEADROOM;
1518 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1519
1520 ret = dev_alloc_name(ndev, ndev->name);
1521 if (ret < 0) {
1522 free_netdev(ndev);
1523 return ret;
1524 }
1525
1526 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1527 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1528 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1529
1530 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1531 sdata = netdev_priv(ndev);
1532 ndev->ieee80211_ptr = &sdata->wdev;
1533 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1534 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1535
1536 sdata->dev = ndev;
1537 }
1538
1539 /* initialise type-independent data */
1540 sdata->wdev.wiphy = local->hw.wiphy;
1541 sdata->local = local;
1542
1543 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1544 skb_queue_head_init(&sdata->fragments[i].skb_list);
1545
1546 INIT_LIST_HEAD(&sdata->key_list);
1547
1548 spin_lock_init(&sdata->cleanup_stations_lock);
1549 INIT_LIST_HEAD(&sdata->cleanup_stations);
1550 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1551 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1552 ieee80211_dfs_cac_timer_work);
1553
1554 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1555 struct ieee80211_supported_band *sband;
1556 sband = local->hw.wiphy->bands[i];
1557 sdata->rc_rateidx_mask[i] =
1558 sband ? (1 << sband->n_bitrates) - 1 : 0;
1559 if (sband)
1560 memcpy(sdata->rc_rateidx_mcs_mask[i],
1561 sband->ht_cap.mcs.rx_mask,
1562 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1563 else
1564 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1565 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1566 }
1567
1568 ieee80211_set_default_queues(sdata);
1569
1570 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1571 sdata->user_power_level = local->user_power_level;
1572
1573 /* setup type-dependent data */
1574 ieee80211_setup_sdata(sdata, type);
1575
1576 if (ndev) {
1577 if (params) {
1578 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1579 if (type == NL80211_IFTYPE_STATION)
1580 sdata->u.mgd.use_4addr = params->use_4addr;
1581 }
1582
1583 ndev->features |= local->hw.netdev_features;
1584
1585 ret = register_netdevice(ndev);
1586 if (ret) {
1587 free_netdev(ndev);
1588 return ret;
1589 }
1590 }
1591
1592 mutex_lock(&local->iflist_mtx);
1593 list_add_tail_rcu(&sdata->list, &local->interfaces);
1594 mutex_unlock(&local->iflist_mtx);
1595
1596 if (new_wdev)
1597 *new_wdev = &sdata->wdev;
1598
1599 return 0;
1600 }
1601
1602 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1603 {
1604 ASSERT_RTNL();
1605
1606 mutex_lock(&sdata->local->iflist_mtx);
1607 list_del_rcu(&sdata->list);
1608 mutex_unlock(&sdata->local->iflist_mtx);
1609
1610 synchronize_rcu();
1611
1612 if (sdata->dev) {
1613 unregister_netdevice(sdata->dev);
1614 } else {
1615 cfg80211_unregister_wdev(&sdata->wdev);
1616 kfree(sdata);
1617 }
1618 }
1619
1620 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1621 {
1622 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1623 return;
1624 ieee80211_do_stop(sdata, true);
1625 ieee80211_teardown_sdata(sdata);
1626 }
1627
1628 /*
1629 * Remove all interfaces, may only be called at hardware unregistration
1630 * time because it doesn't do RCU-safe list removals.
1631 */
1632 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1633 {
1634 struct ieee80211_sub_if_data *sdata, *tmp;
1635 LIST_HEAD(unreg_list);
1636 LIST_HEAD(wdev_list);
1637
1638 ASSERT_RTNL();
1639
1640 mutex_lock(&local->iflist_mtx);
1641 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1642 list_del(&sdata->list);
1643
1644 if (sdata->dev)
1645 unregister_netdevice_queue(sdata->dev, &unreg_list);
1646 else
1647 list_add(&sdata->list, &wdev_list);
1648 }
1649 mutex_unlock(&local->iflist_mtx);
1650 unregister_netdevice_many(&unreg_list);
1651 list_del(&unreg_list);
1652
1653 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1654 list_del(&sdata->list);
1655 cfg80211_unregister_wdev(&sdata->wdev);
1656 kfree(sdata);
1657 }
1658 }
1659
1660 static int netdev_notify(struct notifier_block *nb,
1661 unsigned long state,
1662 void *ndev)
1663 {
1664 struct net_device *dev = ndev;
1665 struct ieee80211_sub_if_data *sdata;
1666
1667 if (state != NETDEV_CHANGENAME)
1668 return 0;
1669
1670 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1671 return 0;
1672
1673 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1674 return 0;
1675
1676 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1677
1678 memcpy(sdata->name, dev->name, IFNAMSIZ);
1679
1680 ieee80211_debugfs_rename_netdev(sdata);
1681 return 0;
1682 }
1683
1684 static struct notifier_block mac80211_netdev_notifier = {
1685 .notifier_call = netdev_notify,
1686 };
1687
1688 int ieee80211_iface_init(void)
1689 {
1690 return register_netdevice_notifier(&mac80211_netdev_notifier);
1691 }
1692
1693 void ieee80211_iface_exit(void)
1694 {
1695 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1696 }
Linux kernel - Deliverables
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