]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/mac80211/iface.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless
[mirror_ubuntu-artful-kernel.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 ieee80211_flush_queues(local, NULL);
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 /* we're brought up, everything changes */
492 hw_reconf_flags = ~0;
493 ieee80211_led_radio(local, true);
494 ieee80211_mod_tpt_led_trig(local,
495 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
496 }
497
498 /*
499 * Copy the hopefully now-present MAC address to
500 * this interface, if it has the special null one.
501 */
502 if (dev && is_zero_ether_addr(dev->dev_addr)) {
503 memcpy(dev->dev_addr,
504 local->hw.wiphy->perm_addr,
505 ETH_ALEN);
506 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
507
508 if (!is_valid_ether_addr(dev->dev_addr)) {
509 res = -EADDRNOTAVAIL;
510 goto err_stop;
511 }
512 }
513
514 switch (sdata->vif.type) {
515 case NL80211_IFTYPE_AP_VLAN:
516 /* no need to tell driver, but set carrier and chanctx */
517 if (rtnl_dereference(sdata->bss->beacon)) {
518 ieee80211_vif_vlan_copy_chanctx(sdata);
519 netif_carrier_on(dev);
520 } else {
521 netif_carrier_off(dev);
522 }
523 break;
524 case NL80211_IFTYPE_MONITOR:
525 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
526 local->cooked_mntrs++;
527 break;
528 }
529
530 if (local->monitors == 0 && local->open_count == 0) {
531 res = ieee80211_add_virtual_monitor(local);
532 if (res)
533 goto err_stop;
534 }
535
536 /* must be before the call to ieee80211_configure_filter */
537 local->monitors++;
538 if (local->monitors == 1) {
539 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
540 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
541 }
542
543 ieee80211_adjust_monitor_flags(sdata, 1);
544 ieee80211_configure_filter(local);
545 mutex_lock(&local->mtx);
546 ieee80211_recalc_idle(local);
547 mutex_unlock(&local->mtx);
548
549 netif_carrier_on(dev);
550 break;
551 default:
552 if (coming_up) {
553 ieee80211_del_virtual_monitor(local);
554
555 res = drv_add_interface(local, sdata);
556 if (res)
557 goto err_stop;
558 res = ieee80211_check_queues(sdata);
559 if (res)
560 goto err_del_interface;
561 }
562
563 if (sdata->vif.type == NL80211_IFTYPE_AP) {
564 local->fif_pspoll++;
565 local->fif_probe_req++;
566
567 ieee80211_configure_filter(local);
568 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
569 local->fif_probe_req++;
570 }
571
572 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
573 changed |= ieee80211_reset_erp_info(sdata);
574 ieee80211_bss_info_change_notify(sdata, changed);
575
576 switch (sdata->vif.type) {
577 case NL80211_IFTYPE_STATION:
578 case NL80211_IFTYPE_ADHOC:
579 case NL80211_IFTYPE_AP:
580 case NL80211_IFTYPE_MESH_POINT:
581 netif_carrier_off(dev);
582 break;
583 case NL80211_IFTYPE_WDS:
584 case NL80211_IFTYPE_P2P_DEVICE:
585 break;
586 default:
587 netif_carrier_on(dev);
588 }
589
590 /*
591 * set default queue parameters so drivers don't
592 * need to initialise the hardware if the hardware
593 * doesn't start up with sane defaults
594 */
595 ieee80211_set_wmm_default(sdata, true);
596 }
597
598 set_bit(SDATA_STATE_RUNNING, &sdata->state);
599
600 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
601 /* Create STA entry for the WDS peer */
602 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
603 GFP_KERNEL);
604 if (!sta) {
605 res = -ENOMEM;
606 goto err_del_interface;
607 }
608
609 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
610 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
611 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
612
613 res = sta_info_insert(sta);
614 if (res) {
615 /* STA has been freed */
616 goto err_del_interface;
617 }
618
619 rate_control_rate_init(sta);
620 netif_carrier_on(dev);
621 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
622 rcu_assign_pointer(local->p2p_sdata, sdata);
623 }
624
625 /*
626 * set_multicast_list will be invoked by the networking core
627 * which will check whether any increments here were done in
628 * error and sync them down to the hardware as filter flags.
629 */
630 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
631 atomic_inc(&local->iff_allmultis);
632
633 if (sdata->flags & IEEE80211_SDATA_PROMISC)
634 atomic_inc(&local->iff_promiscs);
635
636 if (coming_up)
637 local->open_count++;
638
639 if (hw_reconf_flags)
640 ieee80211_hw_config(local, hw_reconf_flags);
641
642 ieee80211_recalc_ps(local, -1);
643
644 if (dev)
645 netif_tx_start_all_queues(dev);
646
647 return 0;
648 err_del_interface:
649 drv_remove_interface(local, sdata);
650 err_stop:
651 if (!local->open_count)
652 drv_stop(local);
653 err_del_bss:
654 sdata->bss = NULL;
655 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
656 list_del(&sdata->u.vlan.list);
657 /* might already be clear but that doesn't matter */
658 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
659 return res;
660 }
661
662 static int ieee80211_open(struct net_device *dev)
663 {
664 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
665 int err;
666
667 /* fail early if user set an invalid address */
668 if (!is_valid_ether_addr(dev->dev_addr))
669 return -EADDRNOTAVAIL;
670
671 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
672 if (err)
673 return err;
674
675 return ieee80211_do_open(&sdata->wdev, true);
676 }
677
678 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
679 bool going_down)
680 {
681 struct ieee80211_local *local = sdata->local;
682 unsigned long flags;
683 struct sk_buff *skb, *tmp;
684 u32 hw_reconf_flags = 0;
685 int i, flushed;
686 struct ps_data *ps;
687
688 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
689
690 if (rcu_access_pointer(local->scan_sdata) == sdata)
691 ieee80211_scan_cancel(local);
692
693 /*
694 * Stop TX on this interface first.
695 */
696 if (sdata->dev)
697 netif_tx_stop_all_queues(sdata->dev);
698
699 ieee80211_roc_purge(sdata);
700
701 if (sdata->vif.type == NL80211_IFTYPE_STATION)
702 ieee80211_mgd_stop(sdata);
703
704 /*
705 * Remove all stations associated with this interface.
706 *
707 * This must be done before calling ops->remove_interface()
708 * because otherwise we can later invoke ops->sta_notify()
709 * whenever the STAs are removed, and that invalidates driver
710 * assumptions about always getting a vif pointer that is valid
711 * (because if we remove a STA after ops->remove_interface()
712 * the driver will have removed the vif info already!)
713 *
714 * This is relevant only in WDS mode, in all other modes we've
715 * already removed all stations when disconnecting or similar,
716 * so warn otherwise.
717 *
718 * We call sta_info_flush_cleanup() later, to combine RCU waits.
719 */
720 flushed = sta_info_flush_defer(sdata);
721 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
722 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
723
724 /*
725 * Don't count this interface for promisc/allmulti while it
726 * is down. dev_mc_unsync() will invoke set_multicast_list
727 * on the master interface which will sync these down to the
728 * hardware as filter flags.
729 */
730 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
731 atomic_dec(&local->iff_allmultis);
732
733 if (sdata->flags & IEEE80211_SDATA_PROMISC)
734 atomic_dec(&local->iff_promiscs);
735
736 if (sdata->vif.type == NL80211_IFTYPE_AP) {
737 local->fif_pspoll--;
738 local->fif_probe_req--;
739 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
740 local->fif_probe_req--;
741 }
742
743 if (sdata->dev) {
744 netif_addr_lock_bh(sdata->dev);
745 spin_lock_bh(&local->filter_lock);
746 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
747 sdata->dev->addr_len);
748 spin_unlock_bh(&local->filter_lock);
749 netif_addr_unlock_bh(sdata->dev);
750
751 ieee80211_configure_filter(local);
752 }
753
754 del_timer_sync(&local->dynamic_ps_timer);
755 cancel_work_sync(&local->dynamic_ps_enable_work);
756
757 cancel_work_sync(&sdata->recalc_smps);
758
759 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
760
761 if (sdata->wdev.cac_started) {
762 mutex_lock(&local->iflist_mtx);
763 ieee80211_vif_release_channel(sdata);
764 mutex_unlock(&local->iflist_mtx);
765 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
766 GFP_KERNEL);
767 }
768
769 /* APs need special treatment */
770 if (sdata->vif.type == NL80211_IFTYPE_AP) {
771 struct ieee80211_sub_if_data *vlan, *tmpsdata;
772
773 /* down all dependent devices, that is VLANs */
774 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
775 u.vlan.list)
776 dev_close(vlan->dev);
777 WARN_ON(!list_empty(&sdata->u.ap.vlans));
778 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
779 /* remove all packets in parent bc_buf pointing to this dev */
780 ps = &sdata->bss->ps;
781
782 spin_lock_irqsave(&ps->bc_buf.lock, flags);
783 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
784 if (skb->dev == sdata->dev) {
785 __skb_unlink(skb, &ps->bc_buf);
786 local->total_ps_buffered--;
787 ieee80211_free_txskb(&local->hw, skb);
788 }
789 }
790 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
791 }
792
793 if (going_down)
794 local->open_count--;
795
796 switch (sdata->vif.type) {
797 case NL80211_IFTYPE_AP_VLAN:
798 list_del(&sdata->u.vlan.list);
799 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
800 /* no need to tell driver */
801 break;
802 case NL80211_IFTYPE_MONITOR:
803 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
804 local->cooked_mntrs--;
805 break;
806 }
807
808 local->monitors--;
809 if (local->monitors == 0) {
810 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
811 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
812 ieee80211_del_virtual_monitor(local);
813 }
814
815 ieee80211_adjust_monitor_flags(sdata, -1);
816 ieee80211_configure_filter(local);
817 mutex_lock(&local->mtx);
818 ieee80211_recalc_idle(local);
819 mutex_unlock(&local->mtx);
820 break;
821 case NL80211_IFTYPE_P2P_DEVICE:
822 /* relies on synchronize_rcu() below */
823 rcu_assign_pointer(local->p2p_sdata, NULL);
824 /* fall through */
825 default:
826 cancel_work_sync(&sdata->work);
827 /*
828 * When we get here, the interface is marked down.
829 *
830 * sta_info_flush_cleanup() requires rcu_barrier()
831 * first to wait for the station call_rcu() calls
832 * to complete, here we need at least sychronize_rcu()
833 * it to wait for the RX path in case it is using the
834 * interface and enqueuing frames at this very time on
835 * another CPU.
836 */
837 rcu_barrier();
838 sta_info_flush_cleanup(sdata);
839
840 /*
841 * Free all remaining keys, there shouldn't be any,
842 * except maybe in WDS mode?
843 */
844 ieee80211_free_keys(sdata);
845
846 /* fall through */
847 case NL80211_IFTYPE_AP:
848 skb_queue_purge(&sdata->skb_queue);
849
850 if (going_down)
851 drv_remove_interface(local, sdata);
852 }
853
854 sdata->bss = NULL;
855
856 ieee80211_recalc_ps(local, -1);
857
858 if (local->open_count == 0) {
859 ieee80211_clear_tx_pending(local);
860 ieee80211_stop_device(local);
861
862 /* no reconfiguring after stop! */
863 hw_reconf_flags = 0;
864 }
865
866 /* do after stop to avoid reconfiguring when we stop anyway */
867 if (hw_reconf_flags)
868 ieee80211_hw_config(local, hw_reconf_flags);
869
870 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
871 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
872 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
873 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
874 if (info->control.vif == &sdata->vif) {
875 __skb_unlink(skb, &local->pending[i]);
876 ieee80211_free_txskb(&local->hw, skb);
877 }
878 }
879 }
880 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
881
882 if (local->monitors == local->open_count && local->monitors > 0)
883 ieee80211_add_virtual_monitor(local);
884 }
885
886 static int ieee80211_stop(struct net_device *dev)
887 {
888 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
889
890 ieee80211_do_stop(sdata, true);
891
892 return 0;
893 }
894
895 static void ieee80211_set_multicast_list(struct net_device *dev)
896 {
897 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
898 struct ieee80211_local *local = sdata->local;
899 int allmulti, promisc, sdata_allmulti, sdata_promisc;
900
901 allmulti = !!(dev->flags & IFF_ALLMULTI);
902 promisc = !!(dev->flags & IFF_PROMISC);
903 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
904 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
905
906 if (allmulti != sdata_allmulti) {
907 if (dev->flags & IFF_ALLMULTI)
908 atomic_inc(&local->iff_allmultis);
909 else
910 atomic_dec(&local->iff_allmultis);
911 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
912 }
913
914 if (promisc != sdata_promisc) {
915 if (dev->flags & IFF_PROMISC)
916 atomic_inc(&local->iff_promiscs);
917 else
918 atomic_dec(&local->iff_promiscs);
919 sdata->flags ^= IEEE80211_SDATA_PROMISC;
920 }
921
922 /*
923 * TODO: If somebody needs this on AP interfaces,
924 * it can be enabled easily but multicast
925 * addresses from VLANs need to be synced.
926 */
927 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
928 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
929 sdata->vif.type != NL80211_IFTYPE_AP)
930 drv_set_multicast_list(local, sdata, &dev->mc);
931
932 spin_lock_bh(&local->filter_lock);
933 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
934 spin_unlock_bh(&local->filter_lock);
935 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
936 }
937
938 /*
939 * Called when the netdev is removed or, by the code below, before
940 * the interface type changes.
941 */
942 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
943 {
944 int flushed;
945 int i;
946
947 /* free extra data */
948 ieee80211_free_keys(sdata);
949
950 ieee80211_debugfs_remove_netdev(sdata);
951
952 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
953 __skb_queue_purge(&sdata->fragments[i].skb_list);
954 sdata->fragment_next = 0;
955
956 if (ieee80211_vif_is_mesh(&sdata->vif))
957 mesh_rmc_free(sdata);
958
959 flushed = sta_info_flush(sdata);
960 WARN_ON(flushed);
961 }
962
963 static void ieee80211_uninit(struct net_device *dev)
964 {
965 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
966 }
967
968 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
969 struct sk_buff *skb)
970 {
971 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
972 }
973
974 static const struct net_device_ops ieee80211_dataif_ops = {
975 .ndo_open = ieee80211_open,
976 .ndo_stop = ieee80211_stop,
977 .ndo_uninit = ieee80211_uninit,
978 .ndo_start_xmit = ieee80211_subif_start_xmit,
979 .ndo_set_rx_mode = ieee80211_set_multicast_list,
980 .ndo_change_mtu = ieee80211_change_mtu,
981 .ndo_set_mac_address = ieee80211_change_mac,
982 .ndo_select_queue = ieee80211_netdev_select_queue,
983 };
984
985 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
986 struct sk_buff *skb)
987 {
988 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
989 struct ieee80211_local *local = sdata->local;
990 struct ieee80211_hdr *hdr;
991 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
992
993 if (local->hw.queues < IEEE80211_NUM_ACS)
994 return 0;
995
996 if (skb->len < 4 ||
997 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
998 return 0; /* doesn't matter, frame will be dropped */
999
1000 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1001
1002 return ieee80211_select_queue_80211(sdata, skb, hdr);
1003 }
1004
1005 static const struct net_device_ops ieee80211_monitorif_ops = {
1006 .ndo_open = ieee80211_open,
1007 .ndo_stop = ieee80211_stop,
1008 .ndo_uninit = ieee80211_uninit,
1009 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1010 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1011 .ndo_change_mtu = ieee80211_change_mtu,
1012 .ndo_set_mac_address = eth_mac_addr,
1013 .ndo_select_queue = ieee80211_monitor_select_queue,
1014 };
1015
1016 static void ieee80211_if_setup(struct net_device *dev)
1017 {
1018 ether_setup(dev);
1019 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1020 dev->netdev_ops = &ieee80211_dataif_ops;
1021 dev->destructor = free_netdev;
1022 }
1023
1024 static void ieee80211_iface_work(struct work_struct *work)
1025 {
1026 struct ieee80211_sub_if_data *sdata =
1027 container_of(work, struct ieee80211_sub_if_data, work);
1028 struct ieee80211_local *local = sdata->local;
1029 struct sk_buff *skb;
1030 struct sta_info *sta;
1031 struct ieee80211_ra_tid *ra_tid;
1032
1033 if (!ieee80211_sdata_running(sdata))
1034 return;
1035
1036 if (local->scanning)
1037 return;
1038
1039 /*
1040 * ieee80211_queue_work() should have picked up most cases,
1041 * here we'll pick the rest.
1042 */
1043 if (WARN(local->suspended,
1044 "interface work scheduled while going to suspend\n"))
1045 return;
1046
1047 /* first process frames */
1048 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1049 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1050
1051 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1052 ra_tid = (void *)&skb->cb;
1053 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1054 ra_tid->tid);
1055 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1056 ra_tid = (void *)&skb->cb;
1057 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1058 ra_tid->tid);
1059 } else if (ieee80211_is_action(mgmt->frame_control) &&
1060 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1061 int len = skb->len;
1062
1063 mutex_lock(&local->sta_mtx);
1064 sta = sta_info_get_bss(sdata, mgmt->sa);
1065 if (sta) {
1066 switch (mgmt->u.action.u.addba_req.action_code) {
1067 case WLAN_ACTION_ADDBA_REQ:
1068 ieee80211_process_addba_request(
1069 local, sta, mgmt, len);
1070 break;
1071 case WLAN_ACTION_ADDBA_RESP:
1072 ieee80211_process_addba_resp(local, sta,
1073 mgmt, len);
1074 break;
1075 case WLAN_ACTION_DELBA:
1076 ieee80211_process_delba(sdata, sta,
1077 mgmt, len);
1078 break;
1079 default:
1080 WARN_ON(1);
1081 break;
1082 }
1083 }
1084 mutex_unlock(&local->sta_mtx);
1085 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1086 struct ieee80211_hdr *hdr = (void *)mgmt;
1087 /*
1088 * So the frame isn't mgmt, but frame_control
1089 * is at the right place anyway, of course, so
1090 * the if statement is correct.
1091 *
1092 * Warn if we have other data frame types here,
1093 * they must not get here.
1094 */
1095 WARN_ON(hdr->frame_control &
1096 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1097 WARN_ON(!(hdr->seq_ctrl &
1098 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1099 /*
1100 * This was a fragment of a frame, received while
1101 * a block-ack session was active. That cannot be
1102 * right, so terminate the session.
1103 */
1104 mutex_lock(&local->sta_mtx);
1105 sta = sta_info_get_bss(sdata, mgmt->sa);
1106 if (sta) {
1107 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1108 IEEE80211_QOS_CTL_TID_MASK;
1109
1110 __ieee80211_stop_rx_ba_session(
1111 sta, tid, WLAN_BACK_RECIPIENT,
1112 WLAN_REASON_QSTA_REQUIRE_SETUP,
1113 true);
1114 }
1115 mutex_unlock(&local->sta_mtx);
1116 } else switch (sdata->vif.type) {
1117 case NL80211_IFTYPE_STATION:
1118 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1119 break;
1120 case NL80211_IFTYPE_ADHOC:
1121 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1122 break;
1123 case NL80211_IFTYPE_MESH_POINT:
1124 if (!ieee80211_vif_is_mesh(&sdata->vif))
1125 break;
1126 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1127 break;
1128 default:
1129 WARN(1, "frame for unexpected interface type");
1130 break;
1131 }
1132
1133 kfree_skb(skb);
1134 }
1135
1136 /* then other type-dependent work */
1137 switch (sdata->vif.type) {
1138 case NL80211_IFTYPE_STATION:
1139 ieee80211_sta_work(sdata);
1140 break;
1141 case NL80211_IFTYPE_ADHOC:
1142 ieee80211_ibss_work(sdata);
1143 break;
1144 case NL80211_IFTYPE_MESH_POINT:
1145 if (!ieee80211_vif_is_mesh(&sdata->vif))
1146 break;
1147 ieee80211_mesh_work(sdata);
1148 break;
1149 default:
1150 break;
1151 }
1152 }
1153
1154 static void ieee80211_recalc_smps_work(struct work_struct *work)
1155 {
1156 struct ieee80211_sub_if_data *sdata =
1157 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1158
1159 ieee80211_recalc_smps(sdata);
1160 }
1161
1162 /*
1163 * Helper function to initialise an interface to a specific type.
1164 */
1165 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1166 enum nl80211_iftype type)
1167 {
1168 /* clear type-dependent union */
1169 memset(&sdata->u, 0, sizeof(sdata->u));
1170
1171 /* and set some type-dependent values */
1172 sdata->vif.type = type;
1173 sdata->vif.p2p = false;
1174 sdata->wdev.iftype = type;
1175
1176 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1177 sdata->control_port_no_encrypt = false;
1178
1179 sdata->noack_map = 0;
1180
1181 /* only monitor/p2p-device differ */
1182 if (sdata->dev) {
1183 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1184 sdata->dev->type = ARPHRD_ETHER;
1185 }
1186
1187 skb_queue_head_init(&sdata->skb_queue);
1188 INIT_WORK(&sdata->work, ieee80211_iface_work);
1189 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1190
1191 switch (type) {
1192 case NL80211_IFTYPE_P2P_GO:
1193 type = NL80211_IFTYPE_AP;
1194 sdata->vif.type = type;
1195 sdata->vif.p2p = true;
1196 /* fall through */
1197 case NL80211_IFTYPE_AP:
1198 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1199 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1200 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1201 break;
1202 case NL80211_IFTYPE_P2P_CLIENT:
1203 type = NL80211_IFTYPE_STATION;
1204 sdata->vif.type = type;
1205 sdata->vif.p2p = true;
1206 /* fall through */
1207 case NL80211_IFTYPE_STATION:
1208 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1209 ieee80211_sta_setup_sdata(sdata);
1210 break;
1211 case NL80211_IFTYPE_ADHOC:
1212 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1213 ieee80211_ibss_setup_sdata(sdata);
1214 break;
1215 case NL80211_IFTYPE_MESH_POINT:
1216 if (ieee80211_vif_is_mesh(&sdata->vif))
1217 ieee80211_mesh_init_sdata(sdata);
1218 break;
1219 case NL80211_IFTYPE_MONITOR:
1220 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1221 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1222 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1223 MONITOR_FLAG_OTHER_BSS;
1224 break;
1225 case NL80211_IFTYPE_WDS:
1226 sdata->vif.bss_conf.bssid = NULL;
1227 break;
1228 case NL80211_IFTYPE_AP_VLAN:
1229 break;
1230 case NL80211_IFTYPE_P2P_DEVICE:
1231 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1232 break;
1233 case NL80211_IFTYPE_UNSPECIFIED:
1234 case NUM_NL80211_IFTYPES:
1235 BUG();
1236 break;
1237 }
1238
1239 ieee80211_debugfs_add_netdev(sdata);
1240 }
1241
1242 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1243 enum nl80211_iftype type)
1244 {
1245 struct ieee80211_local *local = sdata->local;
1246 int ret, err;
1247 enum nl80211_iftype internal_type = type;
1248 bool p2p = false;
1249
1250 ASSERT_RTNL();
1251
1252 if (!local->ops->change_interface)
1253 return -EBUSY;
1254
1255 switch (sdata->vif.type) {
1256 case NL80211_IFTYPE_AP:
1257 case NL80211_IFTYPE_STATION:
1258 case NL80211_IFTYPE_ADHOC:
1259 /*
1260 * Could maybe also all others here?
1261 * Just not sure how that interacts
1262 * with the RX/config path e.g. for
1263 * mesh.
1264 */
1265 break;
1266 default:
1267 return -EBUSY;
1268 }
1269
1270 switch (type) {
1271 case NL80211_IFTYPE_AP:
1272 case NL80211_IFTYPE_STATION:
1273 case NL80211_IFTYPE_ADHOC:
1274 /*
1275 * Could probably support everything
1276 * but WDS here (WDS do_open can fail
1277 * under memory pressure, which this
1278 * code isn't prepared to handle).
1279 */
1280 break;
1281 case NL80211_IFTYPE_P2P_CLIENT:
1282 p2p = true;
1283 internal_type = NL80211_IFTYPE_STATION;
1284 break;
1285 case NL80211_IFTYPE_P2P_GO:
1286 p2p = true;
1287 internal_type = NL80211_IFTYPE_AP;
1288 break;
1289 default:
1290 return -EBUSY;
1291 }
1292
1293 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1294 if (ret)
1295 return ret;
1296
1297 ieee80211_do_stop(sdata, false);
1298
1299 ieee80211_teardown_sdata(sdata);
1300
1301 ret = drv_change_interface(local, sdata, internal_type, p2p);
1302 if (ret)
1303 type = sdata->vif.type;
1304
1305 /*
1306 * Ignore return value here, there's not much we can do since
1307 * the driver changed the interface type internally already.
1308 * The warnings will hopefully make driver authors fix it :-)
1309 */
1310 ieee80211_check_queues(sdata);
1311
1312 ieee80211_setup_sdata(sdata, type);
1313
1314 err = ieee80211_do_open(&sdata->wdev, false);
1315 WARN(err, "type change: do_open returned %d", err);
1316
1317 return ret;
1318 }
1319
1320 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1321 enum nl80211_iftype type)
1322 {
1323 int ret;
1324
1325 ASSERT_RTNL();
1326
1327 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1328 return 0;
1329
1330 if (ieee80211_sdata_running(sdata)) {
1331 ret = ieee80211_runtime_change_iftype(sdata, type);
1332 if (ret)
1333 return ret;
1334 } else {
1335 /* Purge and reset type-dependent state. */
1336 ieee80211_teardown_sdata(sdata);
1337 ieee80211_setup_sdata(sdata, type);
1338 }
1339
1340 /* reset some values that shouldn't be kept across type changes */
1341 sdata->drop_unencrypted = 0;
1342 if (type == NL80211_IFTYPE_STATION)
1343 sdata->u.mgd.use_4addr = false;
1344
1345 return 0;
1346 }
1347
1348 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1349 u8 *perm_addr, enum nl80211_iftype type)
1350 {
1351 struct ieee80211_sub_if_data *sdata;
1352 u64 mask, start, addr, val, inc;
1353 u8 *m;
1354 u8 tmp_addr[ETH_ALEN];
1355 int i;
1356
1357 /* default ... something at least */
1358 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1359
1360 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1361 local->hw.wiphy->n_addresses <= 1)
1362 return;
1363
1364 mutex_lock(&local->iflist_mtx);
1365
1366 switch (type) {
1367 case NL80211_IFTYPE_MONITOR:
1368 /* doesn't matter */
1369 break;
1370 case NL80211_IFTYPE_WDS:
1371 case NL80211_IFTYPE_AP_VLAN:
1372 /* match up with an AP interface */
1373 list_for_each_entry(sdata, &local->interfaces, list) {
1374 if (sdata->vif.type != NL80211_IFTYPE_AP)
1375 continue;
1376 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1377 break;
1378 }
1379 /* keep default if no AP interface present */
1380 break;
1381 case NL80211_IFTYPE_P2P_CLIENT:
1382 case NL80211_IFTYPE_P2P_GO:
1383 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1384 list_for_each_entry(sdata, &local->interfaces, list) {
1385 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1386 continue;
1387 if (!ieee80211_sdata_running(sdata))
1388 continue;
1389 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1390 goto out_unlock;
1391 }
1392 }
1393 /* otherwise fall through */
1394 default:
1395 /* assign a new address if possible -- try n_addresses first */
1396 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1397 bool used = false;
1398
1399 list_for_each_entry(sdata, &local->interfaces, list) {
1400 if (memcmp(local->hw.wiphy->addresses[i].addr,
1401 sdata->vif.addr, ETH_ALEN) == 0) {
1402 used = true;
1403 break;
1404 }
1405 }
1406
1407 if (!used) {
1408 memcpy(perm_addr,
1409 local->hw.wiphy->addresses[i].addr,
1410 ETH_ALEN);
1411 break;
1412 }
1413 }
1414
1415 /* try mask if available */
1416 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1417 break;
1418
1419 m = local->hw.wiphy->addr_mask;
1420 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1421 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1422 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1423
1424 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1425 /* not a contiguous mask ... not handled now! */
1426 pr_info("not contiguous\n");
1427 break;
1428 }
1429
1430 m = local->hw.wiphy->perm_addr;
1431 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1432 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1433 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1434
1435 inc = 1ULL<<__ffs64(mask);
1436 val = (start & mask);
1437 addr = (start & ~mask) | (val & mask);
1438 do {
1439 bool used = false;
1440
1441 tmp_addr[5] = addr >> 0*8;
1442 tmp_addr[4] = addr >> 1*8;
1443 tmp_addr[3] = addr >> 2*8;
1444 tmp_addr[2] = addr >> 3*8;
1445 tmp_addr[1] = addr >> 4*8;
1446 tmp_addr[0] = addr >> 5*8;
1447
1448 val += inc;
1449
1450 list_for_each_entry(sdata, &local->interfaces, list) {
1451 if (memcmp(tmp_addr, sdata->vif.addr,
1452 ETH_ALEN) == 0) {
1453 used = true;
1454 break;
1455 }
1456 }
1457
1458 if (!used) {
1459 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1460 break;
1461 }
1462 addr = (start & ~mask) | (val & mask);
1463 } while (addr != start);
1464
1465 break;
1466 }
1467
1468 out_unlock:
1469 mutex_unlock(&local->iflist_mtx);
1470 }
1471
1472 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1473 {
1474 struct ieee80211_sub_if_data *sdata;
1475
1476 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1477
1478 ieee80211_cleanup_sdata_stas(sdata);
1479 }
1480
1481 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1482 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1483 struct vif_params *params)
1484 {
1485 struct net_device *ndev = NULL;
1486 struct ieee80211_sub_if_data *sdata = NULL;
1487 int ret, i;
1488 int txqs = 1;
1489
1490 ASSERT_RTNL();
1491
1492 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1493 struct wireless_dev *wdev;
1494
1495 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1496 GFP_KERNEL);
1497 if (!sdata)
1498 return -ENOMEM;
1499 wdev = &sdata->wdev;
1500
1501 sdata->dev = NULL;
1502 strlcpy(sdata->name, name, IFNAMSIZ);
1503 ieee80211_assign_perm_addr(local, wdev->address, type);
1504 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1505 } else {
1506 if (local->hw.queues >= IEEE80211_NUM_ACS)
1507 txqs = IEEE80211_NUM_ACS;
1508
1509 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1510 local->hw.vif_data_size,
1511 name, ieee80211_if_setup, txqs, 1);
1512 if (!ndev)
1513 return -ENOMEM;
1514 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1515
1516 ndev->needed_headroom = local->tx_headroom +
1517 4*6 /* four MAC addresses */
1518 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1519 + 6 /* mesh */
1520 + 8 /* rfc1042/bridge tunnel */
1521 - ETH_HLEN /* ethernet hard_header_len */
1522 + IEEE80211_ENCRYPT_HEADROOM;
1523 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1524
1525 ret = dev_alloc_name(ndev, ndev->name);
1526 if (ret < 0) {
1527 free_netdev(ndev);
1528 return ret;
1529 }
1530
1531 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1532 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1533 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1534
1535 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1536 sdata = netdev_priv(ndev);
1537 ndev->ieee80211_ptr = &sdata->wdev;
1538 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1539 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1540
1541 sdata->dev = ndev;
1542 }
1543
1544 /* initialise type-independent data */
1545 sdata->wdev.wiphy = local->hw.wiphy;
1546 sdata->local = local;
1547
1548 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1549 skb_queue_head_init(&sdata->fragments[i].skb_list);
1550
1551 INIT_LIST_HEAD(&sdata->key_list);
1552
1553 spin_lock_init(&sdata->cleanup_stations_lock);
1554 INIT_LIST_HEAD(&sdata->cleanup_stations);
1555 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1556 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1557 ieee80211_dfs_cac_timer_work);
1558 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1559 ieee80211_delayed_tailroom_dec);
1560
1561 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1562 struct ieee80211_supported_band *sband;
1563 sband = local->hw.wiphy->bands[i];
1564 sdata->rc_rateidx_mask[i] =
1565 sband ? (1 << sband->n_bitrates) - 1 : 0;
1566 if (sband)
1567 memcpy(sdata->rc_rateidx_mcs_mask[i],
1568 sband->ht_cap.mcs.rx_mask,
1569 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1570 else
1571 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1572 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1573 }
1574
1575 ieee80211_set_default_queues(sdata);
1576
1577 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1578 sdata->user_power_level = local->user_power_level;
1579
1580 /* setup type-dependent data */
1581 ieee80211_setup_sdata(sdata, type);
1582
1583 if (ndev) {
1584 if (params) {
1585 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1586 if (type == NL80211_IFTYPE_STATION)
1587 sdata->u.mgd.use_4addr = params->use_4addr;
1588 }
1589
1590 ndev->features |= local->hw.netdev_features;
1591
1592 ret = register_netdevice(ndev);
1593 if (ret) {
1594 free_netdev(ndev);
1595 return ret;
1596 }
1597 }
1598
1599 mutex_lock(&local->iflist_mtx);
1600 list_add_tail_rcu(&sdata->list, &local->interfaces);
1601 mutex_unlock(&local->iflist_mtx);
1602
1603 if (new_wdev)
1604 *new_wdev = &sdata->wdev;
1605
1606 return 0;
1607 }
1608
1609 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1610 {
1611 ASSERT_RTNL();
1612
1613 mutex_lock(&sdata->local->iflist_mtx);
1614 list_del_rcu(&sdata->list);
1615 mutex_unlock(&sdata->local->iflist_mtx);
1616
1617 synchronize_rcu();
1618
1619 if (sdata->dev) {
1620 unregister_netdevice(sdata->dev);
1621 } else {
1622 cfg80211_unregister_wdev(&sdata->wdev);
1623 kfree(sdata);
1624 }
1625 }
1626
1627 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1628 {
1629 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1630 return;
1631 ieee80211_do_stop(sdata, true);
1632 ieee80211_teardown_sdata(sdata);
1633 }
1634
1635 /*
1636 * Remove all interfaces, may only be called at hardware unregistration
1637 * time because it doesn't do RCU-safe list removals.
1638 */
1639 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1640 {
1641 struct ieee80211_sub_if_data *sdata, *tmp;
1642 LIST_HEAD(unreg_list);
1643 LIST_HEAD(wdev_list);
1644
1645 ASSERT_RTNL();
1646
1647 mutex_lock(&local->iflist_mtx);
1648 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1649 list_del(&sdata->list);
1650
1651 if (sdata->dev)
1652 unregister_netdevice_queue(sdata->dev, &unreg_list);
1653 else
1654 list_add(&sdata->list, &wdev_list);
1655 }
1656 mutex_unlock(&local->iflist_mtx);
1657 unregister_netdevice_many(&unreg_list);
1658 list_del(&unreg_list);
1659
1660 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1661 list_del(&sdata->list);
1662 cfg80211_unregister_wdev(&sdata->wdev);
1663 kfree(sdata);
1664 }
1665 }
1666
1667 static int netdev_notify(struct notifier_block *nb,
1668 unsigned long state,
1669 void *ndev)
1670 {
1671 struct net_device *dev = ndev;
1672 struct ieee80211_sub_if_data *sdata;
1673
1674 if (state != NETDEV_CHANGENAME)
1675 return 0;
1676
1677 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1678 return 0;
1679
1680 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1681 return 0;
1682
1683 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1684
1685 memcpy(sdata->name, dev->name, IFNAMSIZ);
1686
1687 ieee80211_debugfs_rename_netdev(sdata);
1688 return 0;
1689 }
1690
1691 static struct notifier_block mac80211_netdev_notifier = {
1692 .notifier_call = netdev_notify,
1693 };
1694
1695 int ieee80211_iface_init(void)
1696 {
1697 return register_netdevice_notifier(&mac80211_netdev_notifier);
1698 }
1699
1700 void ieee80211_iface_exit(void)
1701 {
1702 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1703 }
Ubuntu Artful kernel mirror