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net: pass info struct via netdevice notifier
[deliverable/linux.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 int power;
49
50 rcu_read_lock();
51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 if (!chanctx_conf) {
53 rcu_read_unlock();
54 return false;
55 }
56
57 power = chanctx_conf->def.chan->max_power;
58 rcu_read_unlock();
59
60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 power = min(power, sdata->user_power_level);
62
63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->ap_power_level);
65
66 if (power != sdata->vif.bss_conf.txpower) {
67 sdata->vif.bss_conf.txpower = power;
68 ieee80211_hw_config(sdata->local, 0);
69 return true;
70 }
71
72 return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 if (__ieee80211_recalc_txpower(sdata))
78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
82 {
83 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84 return 0;
85
86 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87 return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
91 {
92 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93 return 0;
94
95 ieee80211_flush_queues(local, NULL);
96
97 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102 bool force_active)
103 {
104 bool working = false, scanning, active;
105 unsigned int led_trig_start = 0, led_trig_stop = 0;
106 struct ieee80211_roc_work *roc;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = force_active ||
111 !list_empty(&local->chanctx_list) ||
112 local->monitors;
113
114 if (!local->ops->remain_on_channel) {
115 list_for_each_entry(roc, &local->roc_list, list) {
116 working = true;
117 break;
118 }
119 }
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156 return -EINVAL;
157
158 dev->mtu = new_mtu;
159 return 0;
160 }
161
162 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
163 {
164 struct ieee80211_sub_if_data *sdata;
165 u64 new, mask, tmp;
166 u8 *m;
167 int ret = 0;
168
169 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
170 return 0;
171
172 m = addr;
173 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176
177 m = local->hw.wiphy->addr_mask;
178 mask = ((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
183 mutex_lock(&local->iflist_mtx);
184 list_for_each_entry(sdata, &local->interfaces, list) {
185 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
186 continue;
187
188 m = sdata->vif.addr;
189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192
193 if ((new & ~mask) != (tmp & ~mask)) {
194 ret = -EINVAL;
195 break;
196 }
197 }
198 mutex_unlock(&local->iflist_mtx);
199
200 return ret;
201 }
202
203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
204 {
205 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
206 struct sockaddr *sa = addr;
207 int ret;
208
209 if (ieee80211_sdata_running(sdata))
210 return -EBUSY;
211
212 ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
213 if (ret)
214 return ret;
215
216 ret = eth_mac_addr(dev, sa);
217
218 if (ret == 0)
219 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
220
221 return ret;
222 }
223
224 static inline int identical_mac_addr_allowed(int type1, int type2)
225 {
226 return type1 == NL80211_IFTYPE_MONITOR ||
227 type2 == NL80211_IFTYPE_MONITOR ||
228 type1 == NL80211_IFTYPE_P2P_DEVICE ||
229 type2 == NL80211_IFTYPE_P2P_DEVICE ||
230 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
231 (type1 == NL80211_IFTYPE_WDS &&
232 (type2 == NL80211_IFTYPE_WDS ||
233 type2 == NL80211_IFTYPE_AP)) ||
234 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
235 (type1 == NL80211_IFTYPE_AP_VLAN &&
236 (type2 == NL80211_IFTYPE_AP ||
237 type2 == NL80211_IFTYPE_AP_VLAN));
238 }
239
240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
241 enum nl80211_iftype iftype)
242 {
243 struct ieee80211_local *local = sdata->local;
244 struct ieee80211_sub_if_data *nsdata;
245
246 ASSERT_RTNL();
247
248 /* we hold the RTNL here so can safely walk the list */
249 list_for_each_entry(nsdata, &local->interfaces, list) {
250 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
251 /*
252 * Allow only a single IBSS interface to be up at any
253 * time. This is restricted because beacon distribution
254 * cannot work properly if both are in the same IBSS.
255 *
256 * To remove this restriction we'd have to disallow them
257 * from setting the same SSID on different IBSS interfaces
258 * belonging to the same hardware. Then, however, we're
259 * faced with having to adopt two different TSF timers...
260 */
261 if (iftype == NL80211_IFTYPE_ADHOC &&
262 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
263 return -EBUSY;
264
265 /*
266 * The remaining checks are only performed for interfaces
267 * with the same MAC address.
268 */
269 if (!ether_addr_equal(sdata->vif.addr,
270 nsdata->vif.addr))
271 continue;
272
273 /*
274 * check whether it may have the same address
275 */
276 if (!identical_mac_addr_allowed(iftype,
277 nsdata->vif.type))
278 return -ENOTUNIQ;
279
280 /*
281 * can only add VLANs to enabled APs
282 */
283 if (iftype == NL80211_IFTYPE_AP_VLAN &&
284 nsdata->vif.type == NL80211_IFTYPE_AP)
285 sdata->bss = &nsdata->u.ap;
286 }
287 }
288
289 return 0;
290 }
291
292 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
293 {
294 int n_queues = sdata->local->hw.queues;
295 int i;
296
297 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
298 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
299 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
300 IEEE80211_INVAL_HW_QUEUE))
301 return -EINVAL;
302 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
303 n_queues))
304 return -EINVAL;
305 }
306 }
307
308 if ((sdata->vif.type != NL80211_IFTYPE_AP &&
309 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
310 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
311 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
312 return 0;
313 }
314
315 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
316 return -EINVAL;
317
318 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
319 return -EINVAL;
320
321 return 0;
322 }
323
324 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
325 const int offset)
326 {
327 struct ieee80211_local *local = sdata->local;
328 u32 flags = sdata->u.mntr_flags;
329
330 #define ADJUST(_f, _s) do { \
331 if (flags & MONITOR_FLAG_##_f) \
332 local->fif_##_s += offset; \
333 } while (0)
334
335 ADJUST(FCSFAIL, fcsfail);
336 ADJUST(PLCPFAIL, plcpfail);
337 ADJUST(CONTROL, control);
338 ADJUST(CONTROL, pspoll);
339 ADJUST(OTHER_BSS, other_bss);
340
341 #undef ADJUST
342 }
343
344 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
345 {
346 struct ieee80211_local *local = sdata->local;
347 int i;
348
349 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
350 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
351 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
352 else if (local->hw.queues >= IEEE80211_NUM_ACS)
353 sdata->vif.hw_queue[i] = i;
354 else
355 sdata->vif.hw_queue[i] = 0;
356 }
357 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
358 }
359
360 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
361 {
362 struct ieee80211_sub_if_data *sdata;
363 int ret;
364
365 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
366 return 0;
367
368 ASSERT_RTNL();
369
370 if (local->monitor_sdata)
371 return 0;
372
373 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
374 if (!sdata)
375 return -ENOMEM;
376
377 /* set up data */
378 sdata->local = local;
379 sdata->vif.type = NL80211_IFTYPE_MONITOR;
380 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
381 wiphy_name(local->hw.wiphy));
382
383 ieee80211_set_default_queues(sdata);
384
385 ret = drv_add_interface(local, sdata);
386 if (WARN_ON(ret)) {
387 /* ok .. stupid driver, it asked for this! */
388 kfree(sdata);
389 return ret;
390 }
391
392 ret = ieee80211_check_queues(sdata);
393 if (ret) {
394 kfree(sdata);
395 return ret;
396 }
397
398 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
399 IEEE80211_CHANCTX_EXCLUSIVE);
400 if (ret) {
401 drv_remove_interface(local, sdata);
402 kfree(sdata);
403 return ret;
404 }
405
406 mutex_lock(&local->iflist_mtx);
407 rcu_assign_pointer(local->monitor_sdata, sdata);
408 mutex_unlock(&local->iflist_mtx);
409
410 return 0;
411 }
412
413 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
414 {
415 struct ieee80211_sub_if_data *sdata;
416
417 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
418 return;
419
420 ASSERT_RTNL();
421
422 mutex_lock(&local->iflist_mtx);
423
424 sdata = rcu_dereference_protected(local->monitor_sdata,
425 lockdep_is_held(&local->iflist_mtx));
426 if (!sdata) {
427 mutex_unlock(&local->iflist_mtx);
428 return;
429 }
430
431 rcu_assign_pointer(local->monitor_sdata, NULL);
432 mutex_unlock(&local->iflist_mtx);
433
434 synchronize_net();
435
436 ieee80211_vif_release_channel(sdata);
437
438 drv_remove_interface(local, sdata);
439
440 kfree(sdata);
441 }
442
443 /*
444 * NOTE: Be very careful when changing this function, it must NOT return
445 * an error on interface type changes that have been pre-checked, so most
446 * checks should be in ieee80211_check_concurrent_iface.
447 */
448 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
449 {
450 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
451 struct net_device *dev = wdev->netdev;
452 struct ieee80211_local *local = sdata->local;
453 struct sta_info *sta;
454 u32 changed = 0;
455 int res;
456 u32 hw_reconf_flags = 0;
457
458 switch (sdata->vif.type) {
459 case NL80211_IFTYPE_WDS:
460 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
461 return -ENOLINK;
462 break;
463 case NL80211_IFTYPE_AP_VLAN: {
464 struct ieee80211_sub_if_data *master;
465
466 if (!sdata->bss)
467 return -ENOLINK;
468
469 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
470
471 master = container_of(sdata->bss,
472 struct ieee80211_sub_if_data, u.ap);
473 sdata->control_port_protocol =
474 master->control_port_protocol;
475 sdata->control_port_no_encrypt =
476 master->control_port_no_encrypt;
477 break;
478 }
479 case NL80211_IFTYPE_AP:
480 sdata->bss = &sdata->u.ap;
481 break;
482 case NL80211_IFTYPE_MESH_POINT:
483 case NL80211_IFTYPE_STATION:
484 case NL80211_IFTYPE_MONITOR:
485 case NL80211_IFTYPE_ADHOC:
486 case NL80211_IFTYPE_P2P_DEVICE:
487 /* no special treatment */
488 break;
489 case NL80211_IFTYPE_UNSPECIFIED:
490 case NUM_NL80211_IFTYPES:
491 case NL80211_IFTYPE_P2P_CLIENT:
492 case NL80211_IFTYPE_P2P_GO:
493 /* cannot happen */
494 WARN_ON(1);
495 break;
496 }
497
498 if (local->open_count == 0) {
499 res = drv_start(local);
500 if (res)
501 goto err_del_bss;
502 /* we're brought up, everything changes */
503 hw_reconf_flags = ~0;
504 ieee80211_led_radio(local, true);
505 ieee80211_mod_tpt_led_trig(local,
506 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
507 }
508
509 /*
510 * Copy the hopefully now-present MAC address to
511 * this interface, if it has the special null one.
512 */
513 if (dev && is_zero_ether_addr(dev->dev_addr)) {
514 memcpy(dev->dev_addr,
515 local->hw.wiphy->perm_addr,
516 ETH_ALEN);
517 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
518
519 if (!is_valid_ether_addr(dev->dev_addr)) {
520 res = -EADDRNOTAVAIL;
521 goto err_stop;
522 }
523 }
524
525 switch (sdata->vif.type) {
526 case NL80211_IFTYPE_AP_VLAN:
527 /* no need to tell driver, but set carrier and chanctx */
528 if (rtnl_dereference(sdata->bss->beacon)) {
529 ieee80211_vif_vlan_copy_chanctx(sdata);
530 netif_carrier_on(dev);
531 } else {
532 netif_carrier_off(dev);
533 }
534 break;
535 case NL80211_IFTYPE_MONITOR:
536 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
537 local->cooked_mntrs++;
538 break;
539 }
540
541 if (local->monitors == 0 && local->open_count == 0) {
542 res = ieee80211_add_virtual_monitor(local);
543 if (res)
544 goto err_stop;
545 }
546
547 /* must be before the call to ieee80211_configure_filter */
548 local->monitors++;
549 if (local->monitors == 1) {
550 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
551 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
552 }
553
554 ieee80211_adjust_monitor_flags(sdata, 1);
555 ieee80211_configure_filter(local);
556 mutex_lock(&local->mtx);
557 ieee80211_recalc_idle(local);
558 mutex_unlock(&local->mtx);
559
560 netif_carrier_on(dev);
561 break;
562 default:
563 if (coming_up) {
564 ieee80211_del_virtual_monitor(local);
565
566 res = drv_add_interface(local, sdata);
567 if (res)
568 goto err_stop;
569 res = ieee80211_check_queues(sdata);
570 if (res)
571 goto err_del_interface;
572 }
573
574 if (sdata->vif.type == NL80211_IFTYPE_AP) {
575 local->fif_pspoll++;
576 local->fif_probe_req++;
577
578 ieee80211_configure_filter(local);
579 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
580 local->fif_probe_req++;
581 }
582
583 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
584 changed |= ieee80211_reset_erp_info(sdata);
585 ieee80211_bss_info_change_notify(sdata, changed);
586
587 switch (sdata->vif.type) {
588 case NL80211_IFTYPE_STATION:
589 case NL80211_IFTYPE_ADHOC:
590 case NL80211_IFTYPE_AP:
591 case NL80211_IFTYPE_MESH_POINT:
592 netif_carrier_off(dev);
593 break;
594 case NL80211_IFTYPE_WDS:
595 case NL80211_IFTYPE_P2P_DEVICE:
596 break;
597 default:
598 /* not reached */
599 WARN_ON(1);
600 }
601
602 /*
603 * set default queue parameters so drivers don't
604 * need to initialise the hardware if the hardware
605 * doesn't start up with sane defaults
606 */
607 ieee80211_set_wmm_default(sdata, true);
608 }
609
610 set_bit(SDATA_STATE_RUNNING, &sdata->state);
611
612 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
613 /* Create STA entry for the WDS peer */
614 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
615 GFP_KERNEL);
616 if (!sta) {
617 res = -ENOMEM;
618 goto err_del_interface;
619 }
620
621 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
622 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
623 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
624
625 res = sta_info_insert(sta);
626 if (res) {
627 /* STA has been freed */
628 goto err_del_interface;
629 }
630
631 rate_control_rate_init(sta);
632 netif_carrier_on(dev);
633 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
634 rcu_assign_pointer(local->p2p_sdata, sdata);
635 }
636
637 /*
638 * set_multicast_list will be invoked by the networking core
639 * which will check whether any increments here were done in
640 * error and sync them down to the hardware as filter flags.
641 */
642 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
643 atomic_inc(&local->iff_allmultis);
644
645 if (sdata->flags & IEEE80211_SDATA_PROMISC)
646 atomic_inc(&local->iff_promiscs);
647
648 if (coming_up)
649 local->open_count++;
650
651 if (hw_reconf_flags)
652 ieee80211_hw_config(local, hw_reconf_flags);
653
654 ieee80211_recalc_ps(local, -1);
655
656 if (dev) {
657 unsigned long flags;
658 int n_acs = IEEE80211_NUM_ACS;
659 int ac;
660
661 if (local->hw.queues < IEEE80211_NUM_ACS)
662 n_acs = 1;
663
664 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
665 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
666 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
667 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
668 for (ac = 0; ac < n_acs; ac++) {
669 int ac_queue = sdata->vif.hw_queue[ac];
670
671 if (local->queue_stop_reasons[ac_queue] == 0 &&
672 skb_queue_empty(&local->pending[ac_queue]))
673 netif_start_subqueue(dev, ac);
674 }
675 }
676 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
677 }
678
679 return 0;
680 err_del_interface:
681 drv_remove_interface(local, sdata);
682 err_stop:
683 if (!local->open_count)
684 drv_stop(local);
685 err_del_bss:
686 sdata->bss = NULL;
687 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
688 list_del(&sdata->u.vlan.list);
689 /* might already be clear but that doesn't matter */
690 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
691 return res;
692 }
693
694 static int ieee80211_open(struct net_device *dev)
695 {
696 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
697 int err;
698
699 /* fail early if user set an invalid address */
700 if (!is_valid_ether_addr(dev->dev_addr))
701 return -EADDRNOTAVAIL;
702
703 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
704 if (err)
705 return err;
706
707 return ieee80211_do_open(&sdata->wdev, true);
708 }
709
710 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
711 bool going_down)
712 {
713 struct ieee80211_local *local = sdata->local;
714 unsigned long flags;
715 struct sk_buff *skb, *tmp;
716 u32 hw_reconf_flags = 0;
717 int i, flushed;
718 struct ps_data *ps;
719
720 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
721
722 if (rcu_access_pointer(local->scan_sdata) == sdata)
723 ieee80211_scan_cancel(local);
724
725 /*
726 * Stop TX on this interface first.
727 */
728 if (sdata->dev)
729 netif_tx_stop_all_queues(sdata->dev);
730
731 ieee80211_roc_purge(local, sdata);
732
733 if (sdata->vif.type == NL80211_IFTYPE_STATION)
734 ieee80211_mgd_stop(sdata);
735
736 /*
737 * Remove all stations associated with this interface.
738 *
739 * This must be done before calling ops->remove_interface()
740 * because otherwise we can later invoke ops->sta_notify()
741 * whenever the STAs are removed, and that invalidates driver
742 * assumptions about always getting a vif pointer that is valid
743 * (because if we remove a STA after ops->remove_interface()
744 * the driver will have removed the vif info already!)
745 *
746 * This is relevant only in WDS mode, in all other modes we've
747 * already removed all stations when disconnecting or similar,
748 * so warn otherwise.
749 *
750 * We call sta_info_flush_cleanup() later, to combine RCU waits.
751 */
752 flushed = sta_info_flush_defer(sdata);
753 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
754 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
755
756 /* don't count this interface for promisc/allmulti while it is down */
757 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
758 atomic_dec(&local->iff_allmultis);
759
760 if (sdata->flags & IEEE80211_SDATA_PROMISC)
761 atomic_dec(&local->iff_promiscs);
762
763 if (sdata->vif.type == NL80211_IFTYPE_AP) {
764 local->fif_pspoll--;
765 local->fif_probe_req--;
766 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
767 local->fif_probe_req--;
768 }
769
770 if (sdata->dev) {
771 netif_addr_lock_bh(sdata->dev);
772 spin_lock_bh(&local->filter_lock);
773 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
774 sdata->dev->addr_len);
775 spin_unlock_bh(&local->filter_lock);
776 netif_addr_unlock_bh(sdata->dev);
777 }
778
779 del_timer_sync(&local->dynamic_ps_timer);
780 cancel_work_sync(&local->dynamic_ps_enable_work);
781
782 cancel_work_sync(&sdata->recalc_smps);
783
784 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
785
786 if (sdata->wdev.cac_started) {
787 WARN_ON(local->suspended);
788 mutex_lock(&local->iflist_mtx);
789 ieee80211_vif_release_channel(sdata);
790 mutex_unlock(&local->iflist_mtx);
791 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
792 GFP_KERNEL);
793 }
794
795 /* APs need special treatment */
796 if (sdata->vif.type == NL80211_IFTYPE_AP) {
797 struct ieee80211_sub_if_data *vlan, *tmpsdata;
798
799 /* down all dependent devices, that is VLANs */
800 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
801 u.vlan.list)
802 dev_close(vlan->dev);
803 WARN_ON(!list_empty(&sdata->u.ap.vlans));
804 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
805 /* remove all packets in parent bc_buf pointing to this dev */
806 ps = &sdata->bss->ps;
807
808 spin_lock_irqsave(&ps->bc_buf.lock, flags);
809 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
810 if (skb->dev == sdata->dev) {
811 __skb_unlink(skb, &ps->bc_buf);
812 local->total_ps_buffered--;
813 ieee80211_free_txskb(&local->hw, skb);
814 }
815 }
816 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
817 }
818
819 if (going_down)
820 local->open_count--;
821
822 switch (sdata->vif.type) {
823 case NL80211_IFTYPE_AP_VLAN:
824 list_del(&sdata->u.vlan.list);
825 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
826 /* no need to tell driver */
827 break;
828 case NL80211_IFTYPE_MONITOR:
829 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
830 local->cooked_mntrs--;
831 break;
832 }
833
834 local->monitors--;
835 if (local->monitors == 0) {
836 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
837 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
838 }
839
840 ieee80211_adjust_monitor_flags(sdata, -1);
841 break;
842 case NL80211_IFTYPE_P2P_DEVICE:
843 /* relies on synchronize_rcu() below */
844 rcu_assign_pointer(local->p2p_sdata, NULL);
845 /* fall through */
846 default:
847 cancel_work_sync(&sdata->work);
848 /*
849 * When we get here, the interface is marked down.
850 *
851 * sta_info_flush_cleanup() requires rcu_barrier()
852 * first to wait for the station call_rcu() calls
853 * to complete, and we also need synchronize_rcu()
854 * to wait for the RX path in case it is using the
855 * interface and enqueuing frames at this very time on
856 * another CPU.
857 */
858 synchronize_rcu();
859 rcu_barrier();
860 sta_info_flush_cleanup(sdata);
861
862 /*
863 * Free all remaining keys, there shouldn't be any,
864 * except maybe in WDS mode?
865 */
866 ieee80211_free_keys(sdata);
867
868 /* fall through */
869 case NL80211_IFTYPE_AP:
870 skb_queue_purge(&sdata->skb_queue);
871 }
872
873 sdata->bss = NULL;
874
875 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
876 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
877 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
878 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
879 if (info->control.vif == &sdata->vif) {
880 __skb_unlink(skb, &local->pending[i]);
881 ieee80211_free_txskb(&local->hw, skb);
882 }
883 }
884 }
885 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
886
887 if (local->open_count == 0)
888 ieee80211_clear_tx_pending(local);
889
890 /*
891 * If the interface goes down while suspended, presumably because
892 * the device was unplugged and that happens before our resume,
893 * then the driver is already unconfigured and the remainder of
894 * this function isn't needed.
895 * XXX: what about WoWLAN? If the device has software state, e.g.
896 * memory allocated, it might expect teardown commands from
897 * mac80211 here?
898 */
899 if (local->suspended) {
900 WARN_ON(local->wowlan);
901 WARN_ON(rtnl_dereference(local->monitor_sdata));
902 return;
903 }
904
905 switch (sdata->vif.type) {
906 case NL80211_IFTYPE_AP_VLAN:
907 break;
908 case NL80211_IFTYPE_MONITOR:
909 if (local->monitors == 0)
910 ieee80211_del_virtual_monitor(local);
911
912 mutex_lock(&local->mtx);
913 ieee80211_recalc_idle(local);
914 mutex_unlock(&local->mtx);
915 break;
916 default:
917 if (going_down)
918 drv_remove_interface(local, sdata);
919 }
920
921 ieee80211_recalc_ps(local, -1);
922
923 if (local->open_count == 0) {
924 ieee80211_stop_device(local);
925
926 /* no reconfiguring after stop! */
927 return;
928 }
929
930 /* do after stop to avoid reconfiguring when we stop anyway */
931 ieee80211_configure_filter(local);
932 ieee80211_hw_config(local, hw_reconf_flags);
933
934 if (local->monitors == local->open_count)
935 ieee80211_add_virtual_monitor(local);
936 }
937
938 static int ieee80211_stop(struct net_device *dev)
939 {
940 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
941
942 ieee80211_do_stop(sdata, true);
943
944 return 0;
945 }
946
947 static void ieee80211_set_multicast_list(struct net_device *dev)
948 {
949 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
950 struct ieee80211_local *local = sdata->local;
951 int allmulti, promisc, sdata_allmulti, sdata_promisc;
952
953 allmulti = !!(dev->flags & IFF_ALLMULTI);
954 promisc = !!(dev->flags & IFF_PROMISC);
955 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
956 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
957
958 if (allmulti != sdata_allmulti) {
959 if (dev->flags & IFF_ALLMULTI)
960 atomic_inc(&local->iff_allmultis);
961 else
962 atomic_dec(&local->iff_allmultis);
963 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
964 }
965
966 if (promisc != sdata_promisc) {
967 if (dev->flags & IFF_PROMISC)
968 atomic_inc(&local->iff_promiscs);
969 else
970 atomic_dec(&local->iff_promiscs);
971 sdata->flags ^= IEEE80211_SDATA_PROMISC;
972 }
973
974 /*
975 * TODO: If somebody needs this on AP interfaces,
976 * it can be enabled easily but multicast
977 * addresses from VLANs need to be synced.
978 */
979 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
980 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
981 sdata->vif.type != NL80211_IFTYPE_AP)
982 drv_set_multicast_list(local, sdata, &dev->mc);
983
984 spin_lock_bh(&local->filter_lock);
985 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
986 spin_unlock_bh(&local->filter_lock);
987 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
988 }
989
990 /*
991 * Called when the netdev is removed or, by the code below, before
992 * the interface type changes.
993 */
994 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
995 {
996 int flushed;
997 int i;
998
999 /* free extra data */
1000 ieee80211_free_keys(sdata);
1001
1002 ieee80211_debugfs_remove_netdev(sdata);
1003
1004 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1005 __skb_queue_purge(&sdata->fragments[i].skb_list);
1006 sdata->fragment_next = 0;
1007
1008 if (ieee80211_vif_is_mesh(&sdata->vif))
1009 mesh_rmc_free(sdata);
1010
1011 flushed = sta_info_flush(sdata);
1012 WARN_ON(flushed);
1013 }
1014
1015 static void ieee80211_uninit(struct net_device *dev)
1016 {
1017 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1018 }
1019
1020 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1021 struct sk_buff *skb)
1022 {
1023 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1024 }
1025
1026 static const struct net_device_ops ieee80211_dataif_ops = {
1027 .ndo_open = ieee80211_open,
1028 .ndo_stop = ieee80211_stop,
1029 .ndo_uninit = ieee80211_uninit,
1030 .ndo_start_xmit = ieee80211_subif_start_xmit,
1031 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1032 .ndo_change_mtu = ieee80211_change_mtu,
1033 .ndo_set_mac_address = ieee80211_change_mac,
1034 .ndo_select_queue = ieee80211_netdev_select_queue,
1035 };
1036
1037 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1038 struct sk_buff *skb)
1039 {
1040 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1041 struct ieee80211_local *local = sdata->local;
1042 struct ieee80211_hdr *hdr;
1043 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1044
1045 if (local->hw.queues < IEEE80211_NUM_ACS)
1046 return 0;
1047
1048 if (skb->len < 4 ||
1049 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1050 return 0; /* doesn't matter, frame will be dropped */
1051
1052 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1053
1054 return ieee80211_select_queue_80211(sdata, skb, hdr);
1055 }
1056
1057 static const struct net_device_ops ieee80211_monitorif_ops = {
1058 .ndo_open = ieee80211_open,
1059 .ndo_stop = ieee80211_stop,
1060 .ndo_uninit = ieee80211_uninit,
1061 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1062 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1063 .ndo_change_mtu = ieee80211_change_mtu,
1064 .ndo_set_mac_address = eth_mac_addr,
1065 .ndo_select_queue = ieee80211_monitor_select_queue,
1066 };
1067
1068 static void ieee80211_if_setup(struct net_device *dev)
1069 {
1070 ether_setup(dev);
1071 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1072 dev->netdev_ops = &ieee80211_dataif_ops;
1073 dev->destructor = free_netdev;
1074 }
1075
1076 static void ieee80211_iface_work(struct work_struct *work)
1077 {
1078 struct ieee80211_sub_if_data *sdata =
1079 container_of(work, struct ieee80211_sub_if_data, work);
1080 struct ieee80211_local *local = sdata->local;
1081 struct sk_buff *skb;
1082 struct sta_info *sta;
1083 struct ieee80211_ra_tid *ra_tid;
1084
1085 if (!ieee80211_sdata_running(sdata))
1086 return;
1087
1088 if (local->scanning)
1089 return;
1090
1091 /*
1092 * ieee80211_queue_work() should have picked up most cases,
1093 * here we'll pick the rest.
1094 */
1095 if (WARN(local->suspended,
1096 "interface work scheduled while going to suspend\n"))
1097 return;
1098
1099 /* first process frames */
1100 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1101 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1102
1103 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1104 ra_tid = (void *)&skb->cb;
1105 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1106 ra_tid->tid);
1107 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1108 ra_tid = (void *)&skb->cb;
1109 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1110 ra_tid->tid);
1111 } else if (ieee80211_is_action(mgmt->frame_control) &&
1112 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1113 int len = skb->len;
1114
1115 mutex_lock(&local->sta_mtx);
1116 sta = sta_info_get_bss(sdata, mgmt->sa);
1117 if (sta) {
1118 switch (mgmt->u.action.u.addba_req.action_code) {
1119 case WLAN_ACTION_ADDBA_REQ:
1120 ieee80211_process_addba_request(
1121 local, sta, mgmt, len);
1122 break;
1123 case WLAN_ACTION_ADDBA_RESP:
1124 ieee80211_process_addba_resp(local, sta,
1125 mgmt, len);
1126 break;
1127 case WLAN_ACTION_DELBA:
1128 ieee80211_process_delba(sdata, sta,
1129 mgmt, len);
1130 break;
1131 default:
1132 WARN_ON(1);
1133 break;
1134 }
1135 }
1136 mutex_unlock(&local->sta_mtx);
1137 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1138 struct ieee80211_hdr *hdr = (void *)mgmt;
1139 /*
1140 * So the frame isn't mgmt, but frame_control
1141 * is at the right place anyway, of course, so
1142 * the if statement is correct.
1143 *
1144 * Warn if we have other data frame types here,
1145 * they must not get here.
1146 */
1147 WARN_ON(hdr->frame_control &
1148 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1149 WARN_ON(!(hdr->seq_ctrl &
1150 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1151 /*
1152 * This was a fragment of a frame, received while
1153 * a block-ack session was active. That cannot be
1154 * right, so terminate the session.
1155 */
1156 mutex_lock(&local->sta_mtx);
1157 sta = sta_info_get_bss(sdata, mgmt->sa);
1158 if (sta) {
1159 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1160 IEEE80211_QOS_CTL_TID_MASK;
1161
1162 __ieee80211_stop_rx_ba_session(
1163 sta, tid, WLAN_BACK_RECIPIENT,
1164 WLAN_REASON_QSTA_REQUIRE_SETUP,
1165 true);
1166 }
1167 mutex_unlock(&local->sta_mtx);
1168 } else switch (sdata->vif.type) {
1169 case NL80211_IFTYPE_STATION:
1170 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1171 break;
1172 case NL80211_IFTYPE_ADHOC:
1173 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1174 break;
1175 case NL80211_IFTYPE_MESH_POINT:
1176 if (!ieee80211_vif_is_mesh(&sdata->vif))
1177 break;
1178 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1179 break;
1180 default:
1181 WARN(1, "frame for unexpected interface type");
1182 break;
1183 }
1184
1185 kfree_skb(skb);
1186 }
1187
1188 /* then other type-dependent work */
1189 switch (sdata->vif.type) {
1190 case NL80211_IFTYPE_STATION:
1191 ieee80211_sta_work(sdata);
1192 break;
1193 case NL80211_IFTYPE_ADHOC:
1194 ieee80211_ibss_work(sdata);
1195 break;
1196 case NL80211_IFTYPE_MESH_POINT:
1197 if (!ieee80211_vif_is_mesh(&sdata->vif))
1198 break;
1199 ieee80211_mesh_work(sdata);
1200 break;
1201 default:
1202 break;
1203 }
1204 }
1205
1206 static void ieee80211_recalc_smps_work(struct work_struct *work)
1207 {
1208 struct ieee80211_sub_if_data *sdata =
1209 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1210
1211 ieee80211_recalc_smps(sdata);
1212 }
1213
1214 /*
1215 * Helper function to initialise an interface to a specific type.
1216 */
1217 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1218 enum nl80211_iftype type)
1219 {
1220 /* clear type-dependent union */
1221 memset(&sdata->u, 0, sizeof(sdata->u));
1222
1223 /* and set some type-dependent values */
1224 sdata->vif.type = type;
1225 sdata->vif.p2p = false;
1226 sdata->wdev.iftype = type;
1227
1228 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1229 sdata->control_port_no_encrypt = false;
1230
1231 sdata->noack_map = 0;
1232
1233 /* only monitor/p2p-device differ */
1234 if (sdata->dev) {
1235 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1236 sdata->dev->type = ARPHRD_ETHER;
1237 }
1238
1239 skb_queue_head_init(&sdata->skb_queue);
1240 INIT_WORK(&sdata->work, ieee80211_iface_work);
1241 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1242
1243 switch (type) {
1244 case NL80211_IFTYPE_P2P_GO:
1245 type = NL80211_IFTYPE_AP;
1246 sdata->vif.type = type;
1247 sdata->vif.p2p = true;
1248 /* fall through */
1249 case NL80211_IFTYPE_AP:
1250 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1251 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1252 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1253 break;
1254 case NL80211_IFTYPE_P2P_CLIENT:
1255 type = NL80211_IFTYPE_STATION;
1256 sdata->vif.type = type;
1257 sdata->vif.p2p = true;
1258 /* fall through */
1259 case NL80211_IFTYPE_STATION:
1260 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1261 ieee80211_sta_setup_sdata(sdata);
1262 break;
1263 case NL80211_IFTYPE_ADHOC:
1264 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1265 ieee80211_ibss_setup_sdata(sdata);
1266 break;
1267 case NL80211_IFTYPE_MESH_POINT:
1268 if (ieee80211_vif_is_mesh(&sdata->vif))
1269 ieee80211_mesh_init_sdata(sdata);
1270 break;
1271 case NL80211_IFTYPE_MONITOR:
1272 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1273 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1274 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1275 MONITOR_FLAG_OTHER_BSS;
1276 break;
1277 case NL80211_IFTYPE_WDS:
1278 sdata->vif.bss_conf.bssid = NULL;
1279 break;
1280 case NL80211_IFTYPE_AP_VLAN:
1281 break;
1282 case NL80211_IFTYPE_P2P_DEVICE:
1283 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1284 break;
1285 case NL80211_IFTYPE_UNSPECIFIED:
1286 case NUM_NL80211_IFTYPES:
1287 BUG();
1288 break;
1289 }
1290
1291 ieee80211_debugfs_add_netdev(sdata);
1292 }
1293
1294 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1295 enum nl80211_iftype type)
1296 {
1297 struct ieee80211_local *local = sdata->local;
1298 int ret, err;
1299 enum nl80211_iftype internal_type = type;
1300 bool p2p = false;
1301
1302 ASSERT_RTNL();
1303
1304 if (!local->ops->change_interface)
1305 return -EBUSY;
1306
1307 switch (sdata->vif.type) {
1308 case NL80211_IFTYPE_AP:
1309 case NL80211_IFTYPE_STATION:
1310 case NL80211_IFTYPE_ADHOC:
1311 /*
1312 * Could maybe also all others here?
1313 * Just not sure how that interacts
1314 * with the RX/config path e.g. for
1315 * mesh.
1316 */
1317 break;
1318 default:
1319 return -EBUSY;
1320 }
1321
1322 switch (type) {
1323 case NL80211_IFTYPE_AP:
1324 case NL80211_IFTYPE_STATION:
1325 case NL80211_IFTYPE_ADHOC:
1326 /*
1327 * Could probably support everything
1328 * but WDS here (WDS do_open can fail
1329 * under memory pressure, which this
1330 * code isn't prepared to handle).
1331 */
1332 break;
1333 case NL80211_IFTYPE_P2P_CLIENT:
1334 p2p = true;
1335 internal_type = NL80211_IFTYPE_STATION;
1336 break;
1337 case NL80211_IFTYPE_P2P_GO:
1338 p2p = true;
1339 internal_type = NL80211_IFTYPE_AP;
1340 break;
1341 default:
1342 return -EBUSY;
1343 }
1344
1345 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1346 if (ret)
1347 return ret;
1348
1349 ieee80211_do_stop(sdata, false);
1350
1351 ieee80211_teardown_sdata(sdata);
1352
1353 ret = drv_change_interface(local, sdata, internal_type, p2p);
1354 if (ret)
1355 type = sdata->vif.type;
1356
1357 /*
1358 * Ignore return value here, there's not much we can do since
1359 * the driver changed the interface type internally already.
1360 * The warnings will hopefully make driver authors fix it :-)
1361 */
1362 ieee80211_check_queues(sdata);
1363
1364 ieee80211_setup_sdata(sdata, type);
1365
1366 err = ieee80211_do_open(&sdata->wdev, false);
1367 WARN(err, "type change: do_open returned %d", err);
1368
1369 return ret;
1370 }
1371
1372 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1373 enum nl80211_iftype type)
1374 {
1375 int ret;
1376
1377 ASSERT_RTNL();
1378
1379 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1380 return 0;
1381
1382 if (ieee80211_sdata_running(sdata)) {
1383 ret = ieee80211_runtime_change_iftype(sdata, type);
1384 if (ret)
1385 return ret;
1386 } else {
1387 /* Purge and reset type-dependent state. */
1388 ieee80211_teardown_sdata(sdata);
1389 ieee80211_setup_sdata(sdata, type);
1390 }
1391
1392 /* reset some values that shouldn't be kept across type changes */
1393 sdata->drop_unencrypted = 0;
1394 if (type == NL80211_IFTYPE_STATION)
1395 sdata->u.mgd.use_4addr = false;
1396
1397 return 0;
1398 }
1399
1400 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1401 u8 *perm_addr, enum nl80211_iftype type)
1402 {
1403 struct ieee80211_sub_if_data *sdata;
1404 u64 mask, start, addr, val, inc;
1405 u8 *m;
1406 u8 tmp_addr[ETH_ALEN];
1407 int i;
1408
1409 /* default ... something at least */
1410 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1411
1412 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1413 local->hw.wiphy->n_addresses <= 1)
1414 return;
1415
1416 mutex_lock(&local->iflist_mtx);
1417
1418 switch (type) {
1419 case NL80211_IFTYPE_MONITOR:
1420 /* doesn't matter */
1421 break;
1422 case NL80211_IFTYPE_WDS:
1423 case NL80211_IFTYPE_AP_VLAN:
1424 /* match up with an AP interface */
1425 list_for_each_entry(sdata, &local->interfaces, list) {
1426 if (sdata->vif.type != NL80211_IFTYPE_AP)
1427 continue;
1428 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1429 break;
1430 }
1431 /* keep default if no AP interface present */
1432 break;
1433 case NL80211_IFTYPE_P2P_CLIENT:
1434 case NL80211_IFTYPE_P2P_GO:
1435 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1436 list_for_each_entry(sdata, &local->interfaces, list) {
1437 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1438 continue;
1439 if (!ieee80211_sdata_running(sdata))
1440 continue;
1441 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1442 goto out_unlock;
1443 }
1444 }
1445 /* otherwise fall through */
1446 default:
1447 /* assign a new address if possible -- try n_addresses first */
1448 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1449 bool used = false;
1450
1451 list_for_each_entry(sdata, &local->interfaces, list) {
1452 if (memcmp(local->hw.wiphy->addresses[i].addr,
1453 sdata->vif.addr, ETH_ALEN) == 0) {
1454 used = true;
1455 break;
1456 }
1457 }
1458
1459 if (!used) {
1460 memcpy(perm_addr,
1461 local->hw.wiphy->addresses[i].addr,
1462 ETH_ALEN);
1463 break;
1464 }
1465 }
1466
1467 /* try mask if available */
1468 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1469 break;
1470
1471 m = local->hw.wiphy->addr_mask;
1472 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1473 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1474 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1475
1476 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1477 /* not a contiguous mask ... not handled now! */
1478 pr_info("not contiguous\n");
1479 break;
1480 }
1481
1482 m = local->hw.wiphy->perm_addr;
1483 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1484 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1485 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1486
1487 inc = 1ULL<<__ffs64(mask);
1488 val = (start & mask);
1489 addr = (start & ~mask) | (val & mask);
1490 do {
1491 bool used = false;
1492
1493 tmp_addr[5] = addr >> 0*8;
1494 tmp_addr[4] = addr >> 1*8;
1495 tmp_addr[3] = addr >> 2*8;
1496 tmp_addr[2] = addr >> 3*8;
1497 tmp_addr[1] = addr >> 4*8;
1498 tmp_addr[0] = addr >> 5*8;
1499
1500 val += inc;
1501
1502 list_for_each_entry(sdata, &local->interfaces, list) {
1503 if (memcmp(tmp_addr, sdata->vif.addr,
1504 ETH_ALEN) == 0) {
1505 used = true;
1506 break;
1507 }
1508 }
1509
1510 if (!used) {
1511 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1512 break;
1513 }
1514 addr = (start & ~mask) | (val & mask);
1515 } while (addr != start);
1516
1517 break;
1518 }
1519
1520 out_unlock:
1521 mutex_unlock(&local->iflist_mtx);
1522 }
1523
1524 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1525 {
1526 struct ieee80211_sub_if_data *sdata;
1527
1528 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1529
1530 ieee80211_cleanup_sdata_stas(sdata);
1531 }
1532
1533 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1534 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1535 struct vif_params *params)
1536 {
1537 struct net_device *ndev = NULL;
1538 struct ieee80211_sub_if_data *sdata = NULL;
1539 int ret, i;
1540 int txqs = 1;
1541
1542 ASSERT_RTNL();
1543
1544 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1545 struct wireless_dev *wdev;
1546
1547 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1548 GFP_KERNEL);
1549 if (!sdata)
1550 return -ENOMEM;
1551 wdev = &sdata->wdev;
1552
1553 sdata->dev = NULL;
1554 strlcpy(sdata->name, name, IFNAMSIZ);
1555 ieee80211_assign_perm_addr(local, wdev->address, type);
1556 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1557 } else {
1558 if (local->hw.queues >= IEEE80211_NUM_ACS)
1559 txqs = IEEE80211_NUM_ACS;
1560
1561 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1562 local->hw.vif_data_size,
1563 name, ieee80211_if_setup, txqs, 1);
1564 if (!ndev)
1565 return -ENOMEM;
1566 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1567
1568 ndev->needed_headroom = local->tx_headroom +
1569 4*6 /* four MAC addresses */
1570 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1571 + 6 /* mesh */
1572 + 8 /* rfc1042/bridge tunnel */
1573 - ETH_HLEN /* ethernet hard_header_len */
1574 + IEEE80211_ENCRYPT_HEADROOM;
1575 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1576
1577 ret = dev_alloc_name(ndev, ndev->name);
1578 if (ret < 0) {
1579 free_netdev(ndev);
1580 return ret;
1581 }
1582
1583 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1584 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1585 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1586
1587 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1588 sdata = netdev_priv(ndev);
1589 ndev->ieee80211_ptr = &sdata->wdev;
1590 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1591 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1592
1593 sdata->dev = ndev;
1594 }
1595
1596 /* initialise type-independent data */
1597 sdata->wdev.wiphy = local->hw.wiphy;
1598 sdata->local = local;
1599
1600 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1601 skb_queue_head_init(&sdata->fragments[i].skb_list);
1602
1603 INIT_LIST_HEAD(&sdata->key_list);
1604
1605 spin_lock_init(&sdata->cleanup_stations_lock);
1606 INIT_LIST_HEAD(&sdata->cleanup_stations);
1607 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1608 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1609 ieee80211_dfs_cac_timer_work);
1610 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1611 ieee80211_delayed_tailroom_dec);
1612
1613 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1614 struct ieee80211_supported_band *sband;
1615 sband = local->hw.wiphy->bands[i];
1616 sdata->rc_rateidx_mask[i] =
1617 sband ? (1 << sband->n_bitrates) - 1 : 0;
1618 if (sband)
1619 memcpy(sdata->rc_rateidx_mcs_mask[i],
1620 sband->ht_cap.mcs.rx_mask,
1621 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1622 else
1623 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1624 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1625 }
1626
1627 ieee80211_set_default_queues(sdata);
1628
1629 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1630 sdata->user_power_level = local->user_power_level;
1631
1632 /* setup type-dependent data */
1633 ieee80211_setup_sdata(sdata, type);
1634
1635 if (ndev) {
1636 if (params) {
1637 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1638 if (type == NL80211_IFTYPE_STATION)
1639 sdata->u.mgd.use_4addr = params->use_4addr;
1640 }
1641
1642 ndev->features |= local->hw.netdev_features;
1643
1644 ret = register_netdevice(ndev);
1645 if (ret) {
1646 free_netdev(ndev);
1647 return ret;
1648 }
1649 }
1650
1651 mutex_lock(&local->iflist_mtx);
1652 list_add_tail_rcu(&sdata->list, &local->interfaces);
1653 mutex_unlock(&local->iflist_mtx);
1654
1655 if (new_wdev)
1656 *new_wdev = &sdata->wdev;
1657
1658 return 0;
1659 }
1660
1661 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1662 {
1663 ASSERT_RTNL();
1664
1665 mutex_lock(&sdata->local->iflist_mtx);
1666 list_del_rcu(&sdata->list);
1667 mutex_unlock(&sdata->local->iflist_mtx);
1668
1669 synchronize_rcu();
1670
1671 if (sdata->dev) {
1672 unregister_netdevice(sdata->dev);
1673 } else {
1674 cfg80211_unregister_wdev(&sdata->wdev);
1675 kfree(sdata);
1676 }
1677 }
1678
1679 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1680 {
1681 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1682 return;
1683 ieee80211_do_stop(sdata, true);
1684 ieee80211_teardown_sdata(sdata);
1685 }
1686
1687 /*
1688 * Remove all interfaces, may only be called at hardware unregistration
1689 * time because it doesn't do RCU-safe list removals.
1690 */
1691 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1692 {
1693 struct ieee80211_sub_if_data *sdata, *tmp;
1694 LIST_HEAD(unreg_list);
1695 LIST_HEAD(wdev_list);
1696
1697 ASSERT_RTNL();
1698
1699 mutex_lock(&local->iflist_mtx);
1700 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1701 list_del(&sdata->list);
1702
1703 if (sdata->dev)
1704 unregister_netdevice_queue(sdata->dev, &unreg_list);
1705 else
1706 list_add(&sdata->list, &wdev_list);
1707 }
1708 mutex_unlock(&local->iflist_mtx);
1709 unregister_netdevice_many(&unreg_list);
1710 list_del(&unreg_list);
1711
1712 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1713 list_del(&sdata->list);
1714 cfg80211_unregister_wdev(&sdata->wdev);
1715 kfree(sdata);
1716 }
1717 }
1718
1719 static int netdev_notify(struct notifier_block *nb,
1720 unsigned long state, void *ptr)
1721 {
1722 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1723 struct ieee80211_sub_if_data *sdata;
1724
1725 if (state != NETDEV_CHANGENAME)
1726 return 0;
1727
1728 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1729 return 0;
1730
1731 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1732 return 0;
1733
1734 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1735
1736 memcpy(sdata->name, dev->name, IFNAMSIZ);
1737
1738 ieee80211_debugfs_rename_netdev(sdata);
1739 return 0;
1740 }
1741
1742 static struct notifier_block mac80211_netdev_notifier = {
1743 .notifier_call = netdev_notify,
1744 };
1745
1746 int ieee80211_iface_init(void)
1747 {
1748 return register_netdevice_notifier(&mac80211_netdev_notifier);
1749 }
1750
1751 void ieee80211_iface_exit(void)
1752 {
1753 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1754 }
Linux kernel - Deliverables
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