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f0706e82 1/*
0d143fe1
JB
2 * Interface handling (except master interface)
3 *
f0706e82
JB
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
75636525 7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
f0706e82
JB
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/kernel.h>
14#include <linux/if_arp.h>
15#include <linux/netdevice.h>
16#include <linux/rtnetlink.h>
17#include <net/mac80211.h>
18#include "ieee80211_i.h"
19#include "sta_info.h"
e9f207f0 20#include "debugfs_netdev.h"
ee385855 21#include "mesh.h"
0d143fe1 22#include "led.h"
24487981 23#include "driver-ops.h"
0d143fe1 24
c771c9d8
JB
25/**
26 * DOC: Interface list locking
27 *
28 * The interface list in each struct ieee80211_local is protected
29 * three-fold:
30 *
31 * (1) modifications may only be done under the RTNL
32 * (2) modifications and readers are protected against each other by
33 * the iflist_mtx.
34 * (3) modifications are done in an RCU manner so atomic readers
35 * can traverse the list in RCU-safe blocks.
36 *
37 * As a consequence, reads (traversals) of the list can be protected
38 * by either the RTNL, the iflist_mtx or RCU.
39 */
40
41
0d143fe1
JB
42static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
43{
44 int meshhdrlen;
45 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
46
47 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
48
49 /* FIX: what would be proper limits for MTU?
50 * This interface uses 802.3 frames. */
51 if (new_mtu < 256 ||
52 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
53 return -EINVAL;
54 }
55
56#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
57 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
58#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
59 dev->mtu = new_mtu;
60 return 0;
61}
62
63static inline int identical_mac_addr_allowed(int type1, int type2)
64{
65 return type1 == NL80211_IFTYPE_MONITOR ||
66 type2 == NL80211_IFTYPE_MONITOR ||
67 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
68 (type1 == NL80211_IFTYPE_WDS &&
69 (type2 == NL80211_IFTYPE_WDS ||
70 type2 == NL80211_IFTYPE_AP)) ||
71 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
72 (type1 == NL80211_IFTYPE_AP_VLAN &&
73 (type2 == NL80211_IFTYPE_AP ||
74 type2 == NL80211_IFTYPE_AP_VLAN));
75}
76
77static int ieee80211_open(struct net_device *dev)
78{
b4a4bf5d
JB
79 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
80 struct ieee80211_sub_if_data *nsdata;
81 struct ieee80211_local *local = sdata->local;
0d143fe1
JB
82 struct sta_info *sta;
83 struct ieee80211_if_init_conf conf;
84 u32 changed = 0;
85 int res;
e8975581 86 u32 hw_reconf_flags = 0;
0d143fe1
JB
87 u8 null_addr[ETH_ALEN] = {0};
88
0d143fe1
JB
89 /* fail early if user set an invalid address */
90 if (compare_ether_addr(dev->dev_addr, null_addr) &&
91 !is_valid_ether_addr(dev->dev_addr))
92 return -EADDRNOTAVAIL;
93
94 /* we hold the RTNL here so can safely walk the list */
95 list_for_each_entry(nsdata, &local->interfaces, list) {
96 struct net_device *ndev = nsdata->dev;
97
98 if (ndev != dev && netif_running(ndev)) {
99 /*
100 * Allow only a single IBSS interface to be up at any
101 * time. This is restricted because beacon distribution
102 * cannot work properly if both are in the same IBSS.
103 *
104 * To remove this restriction we'd have to disallow them
105 * from setting the same SSID on different IBSS interfaces
106 * belonging to the same hardware. Then, however, we're
107 * faced with having to adopt two different TSF timers...
108 */
109 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
110 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
111 return -EBUSY;
112
113 /*
114 * The remaining checks are only performed for interfaces
115 * with the same MAC address.
116 */
117 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
118 continue;
119
120 /*
121 * check whether it may have the same address
122 */
123 if (!identical_mac_addr_allowed(sdata->vif.type,
124 nsdata->vif.type))
125 return -ENOTUNIQ;
126
127 /*
128 * can only add VLANs to enabled APs
129 */
130 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
131 nsdata->vif.type == NL80211_IFTYPE_AP)
132 sdata->bss = &nsdata->u.ap;
133 }
134 }
135
136 switch (sdata->vif.type) {
137 case NL80211_IFTYPE_WDS:
138 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
139 return -ENOLINK;
140 break;
141 case NL80211_IFTYPE_AP_VLAN:
142 if (!sdata->bss)
143 return -ENOLINK;
144 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
145 break;
146 case NL80211_IFTYPE_AP:
147 sdata->bss = &sdata->u.ap;
148 break;
149 case NL80211_IFTYPE_MESH_POINT:
150 if (!ieee80211_vif_is_mesh(&sdata->vif))
151 break;
152 /* mesh ifaces must set allmulti to forward mcast traffic */
153 atomic_inc(&local->iff_allmultis);
154 break;
155 case NL80211_IFTYPE_STATION:
156 case NL80211_IFTYPE_MONITOR:
157 case NL80211_IFTYPE_ADHOC:
158 /* no special treatment */
159 break;
160 case NL80211_IFTYPE_UNSPECIFIED:
161 case __NL80211_IFTYPE_AFTER_LAST:
162 /* cannot happen */
163 WARN_ON(1);
164 break;
165 }
166
167 if (local->open_count == 0) {
24487981 168 res = drv_start(local);
0d143fe1
JB
169 if (res)
170 goto err_del_bss;
e8975581
JB
171 /* we're brought up, everything changes */
172 hw_reconf_flags = ~0;
1f87f7d3 173 ieee80211_led_radio(local, true);
0d143fe1
JB
174 }
175
176 /*
177 * Check all interfaces and copy the hopefully now-present
178 * MAC address to those that have the special null one.
179 */
180 list_for_each_entry(nsdata, &local->interfaces, list) {
181 struct net_device *ndev = nsdata->dev;
182
183 /*
184 * No need to check netif_running since we do not allow
185 * it to start up with this invalid address.
186 */
0adc23f5 187 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
0d143fe1
JB
188 memcpy(ndev->dev_addr,
189 local->hw.wiphy->perm_addr,
190 ETH_ALEN);
0adc23f5
JL
191 memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
192 }
0d143fe1
JB
193 }
194
0d143fe1
JB
195 /*
196 * Validate the MAC address for this device.
197 */
198 if (!is_valid_ether_addr(dev->dev_addr)) {
24487981
JB
199 if (!local->open_count)
200 drv_stop(local);
0d143fe1
JB
201 return -EADDRNOTAVAIL;
202 }
203
204 switch (sdata->vif.type) {
205 case NL80211_IFTYPE_AP_VLAN:
206 /* no need to tell driver */
207 break;
208 case NL80211_IFTYPE_MONITOR:
209 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
210 local->cooked_mntrs++;
211 break;
212 }
213
214 /* must be before the call to ieee80211_configure_filter */
215 local->monitors++;
e8975581 216 if (local->monitors == 1) {
0869aea0
JB
217 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
218 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
e8975581 219 }
0d143fe1
JB
220
221 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
222 local->fif_fcsfail++;
223 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
224 local->fif_plcpfail++;
e3b90ca2 225 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
0d143fe1 226 local->fif_control++;
e3b90ca2
IP
227 local->fif_pspoll++;
228 }
0d143fe1
JB
229 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
230 local->fif_other_bss++;
231
0d143fe1 232 ieee80211_configure_filter(local);
0d143fe1 233 break;
0d143fe1
JB
234 default:
235 conf.vif = &sdata->vif;
236 conf.type = sdata->vif.type;
237 conf.mac_addr = dev->dev_addr;
24487981 238 res = drv_add_interface(local, &conf);
0d143fe1
JB
239 if (res)
240 goto err_stop;
241
a3c9aa51
AY
242 if (ieee80211_vif_is_mesh(&sdata->vif)) {
243 local->fif_other_bss++;
a3c9aa51 244 ieee80211_configure_filter(local);
a3c9aa51 245
0d143fe1 246 ieee80211_start_mesh(sdata);
e3b90ca2
IP
247 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
248 local->fif_pspoll++;
249
e3b90ca2 250 ieee80211_configure_filter(local);
a3c9aa51 251 }
e3b90ca2 252
0d143fe1
JB
253 changed |= ieee80211_reset_erp_info(sdata);
254 ieee80211_bss_info_change_notify(sdata, changed);
255 ieee80211_enable_keys(sdata);
256
7986cf95 257 if (sdata->vif.type == NL80211_IFTYPE_STATION)
0d143fe1
JB
258 netif_carrier_off(dev);
259 else
260 netif_carrier_on(dev);
261 }
262
263 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
264 /* Create STA entry for the WDS peer */
265 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
266 GFP_KERNEL);
267 if (!sta) {
268 res = -ENOMEM;
269 goto err_del_interface;
270 }
271
272 /* no locking required since STA is not live yet */
273 sta->flags |= WLAN_STA_AUTHORIZED;
274
275 res = sta_info_insert(sta);
276 if (res) {
277 /* STA has been freed */
278 goto err_del_interface;
279 }
280 }
281
0d143fe1
JB
282 /*
283 * set_multicast_list will be invoked by the networking core
284 * which will check whether any increments here were done in
285 * error and sync them down to the hardware as filter flags.
286 */
287 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
288 atomic_inc(&local->iff_allmultis);
289
290 if (sdata->flags & IEEE80211_SDATA_PROMISC)
291 atomic_inc(&local->iff_promiscs);
292
5cff20e6
JB
293 hw_reconf_flags |= __ieee80211_recalc_idle(local);
294
0d143fe1 295 local->open_count++;
e8975581
JB
296 if (hw_reconf_flags) {
297 ieee80211_hw_config(local, hw_reconf_flags);
0d143fe1
JB
298 /*
299 * set default queue parameters so drivers don't
300 * need to initialise the hardware if the hardware
301 * doesn't start up with sane defaults
302 */
303 ieee80211_set_wmm_default(sdata);
304 }
305
10f644a4 306 ieee80211_recalc_ps(local, -1);
965bedad 307
0d143fe1
JB
308 /*
309 * ieee80211_sta_work is disabled while network interface
310 * is down. Therefore, some configuration changes may not
311 * yet be effective. Trigger execution of ieee80211_sta_work
312 * to fix this.
313 */
46900298 314 if (sdata->vif.type == NL80211_IFTYPE_STATION)
42935eca 315 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
f0706e82 316
53623f1a 317 netif_start_queue(dev);
0d143fe1
JB
318
319 return 0;
320 err_del_interface:
24487981 321 drv_remove_interface(local, &conf);
0d143fe1 322 err_stop:
24487981
JB
323 if (!local->open_count)
324 drv_stop(local);
0d143fe1
JB
325 err_del_bss:
326 sdata->bss = NULL;
327 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
328 list_del(&sdata->u.vlan.list);
329 return res;
330}
331
332static int ieee80211_stop(struct net_device *dev)
333{
334 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
335 struct ieee80211_local *local = sdata->local;
336 struct ieee80211_if_init_conf conf;
337 struct sta_info *sta;
5061b0c2
JB
338 unsigned long flags;
339 struct sk_buff *skb, *tmp;
e8975581 340 u32 hw_reconf_flags = 0;
5061b0c2 341 int i;
0d143fe1
JB
342
343 /*
344 * Stop TX on this interface first.
345 */
53623f1a 346 netif_stop_queue(dev);
0d143fe1
JB
347
348 /*
349 * Now delete all active aggregation sessions.
350 */
351 rcu_read_lock();
352
353 list_for_each_entry_rcu(sta, &local->sta_list, list) {
354 if (sta->sdata == sdata)
2dace10e 355 ieee80211_sta_tear_down_BA_sessions(sta);
0d143fe1
JB
356 }
357
358 rcu_read_unlock();
359
360 /*
361 * Remove all stations associated with this interface.
362 *
363 * This must be done before calling ops->remove_interface()
364 * because otherwise we can later invoke ops->sta_notify()
365 * whenever the STAs are removed, and that invalidates driver
366 * assumptions about always getting a vif pointer that is valid
367 * (because if we remove a STA after ops->remove_interface()
368 * the driver will have removed the vif info already!)
369 *
370 * We could relax this and only unlink the stations from the
371 * hash table and list but keep them on a per-sdata list that
372 * will be inserted back again when the interface is brought
373 * up again, but I don't currently see a use case for that,
374 * except with WDS which gets a STA entry created when it is
375 * brought up.
376 */
377 sta_info_flush(local, sdata);
378
379 /*
380 * Don't count this interface for promisc/allmulti while it
381 * is down. dev_mc_unsync() will invoke set_multicast_list
382 * on the master interface which will sync these down to the
383 * hardware as filter flags.
384 */
385 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
386 atomic_dec(&local->iff_allmultis);
387
388 if (sdata->flags & IEEE80211_SDATA_PROMISC)
389 atomic_dec(&local->iff_promiscs);
390
e3b90ca2
IP
391 if (sdata->vif.type == NL80211_IFTYPE_AP)
392 local->fif_pspoll--;
393
3b8d81e0
JB
394 netif_addr_lock_bh(dev);
395 spin_lock_bh(&local->filter_lock);
396 __dev_addr_unsync(&local->mc_list, &local->mc_count,
397 &dev->mc_list, &dev->mc_count);
3b8d81e0
JB
398 spin_unlock_bh(&local->filter_lock);
399 netif_addr_unlock_bh(dev);
400
3ac64bee
JB
401 ieee80211_configure_filter(local);
402
7cbf0ba5
VN
403 del_timer_sync(&local->dynamic_ps_timer);
404 cancel_work_sync(&local->dynamic_ps_enable_work);
0d143fe1
JB
405
406 /* APs need special treatment */
407 if (sdata->vif.type == NL80211_IFTYPE_AP) {
57c9fff3 408 struct ieee80211_sub_if_data *vlan, *tmpsdata;
0d143fe1
JB
409 struct beacon_data *old_beacon = sdata->u.ap.beacon;
410
411 /* remove beacon */
412 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
413 synchronize_rcu();
414 kfree(old_beacon);
415
416 /* down all dependent devices, that is VLANs */
57c9fff3 417 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
0d143fe1
JB
418 u.vlan.list)
419 dev_close(vlan->dev);
420 WARN_ON(!list_empty(&sdata->u.ap.vlans));
421 }
422
423 local->open_count--;
424
425 switch (sdata->vif.type) {
426 case NL80211_IFTYPE_AP_VLAN:
427 list_del(&sdata->u.vlan.list);
428 /* no need to tell driver */
429 break;
430 case NL80211_IFTYPE_MONITOR:
431 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
432 local->cooked_mntrs--;
433 break;
434 }
435
436 local->monitors--;
e8975581 437 if (local->monitors == 0) {
0869aea0
JB
438 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
439 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
e8975581 440 }
0d143fe1
JB
441
442 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
443 local->fif_fcsfail--;
444 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
445 local->fif_plcpfail--;
e3b90ca2
IP
446 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
447 local->fif_pspoll--;
0d143fe1 448 local->fif_control--;
e3b90ca2 449 }
0d143fe1
JB
450 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
451 local->fif_other_bss--;
452
0d143fe1 453 ieee80211_configure_filter(local);
0d143fe1
JB
454 break;
455 case NL80211_IFTYPE_STATION:
46900298
JB
456 del_timer_sync(&sdata->u.mgd.chswitch_timer);
457 del_timer_sync(&sdata->u.mgd.timer);
0e2b6286
JB
458 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
459 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
0d143fe1 460 /*
0e2b6286
JB
461 * If any of the timers fired while we waited for it, it will
462 * have queued its work. Now the work will be running again
0d143fe1
JB
463 * but will not rearm the timer again because it checks
464 * whether the interface is running, which, at this point,
465 * it no longer is.
466 */
46900298
JB
467 cancel_work_sync(&sdata->u.mgd.work);
468 cancel_work_sync(&sdata->u.mgd.chswitch_work);
0e2b6286 469 cancel_work_sync(&sdata->u.mgd.monitor_work);
04de8381
KV
470 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
471
0d143fe1
JB
472 /*
473 * When we get here, the interface is marked down.
474 * Call synchronize_rcu() to wait for the RX path
475 * should it be using the interface and enqueuing
476 * frames at this very time on another CPU.
477 */
478 synchronize_rcu();
46900298 479 skb_queue_purge(&sdata->u.mgd.skb_queue);
46900298
JB
480 /* fall through */
481 case NL80211_IFTYPE_ADHOC:
482 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298
JB
483 del_timer_sync(&sdata->u.ibss.timer);
484 cancel_work_sync(&sdata->u.ibss.work);
485 synchronize_rcu();
486 skb_queue_purge(&sdata->u.ibss.skb_queue);
487 }
0d143fe1
JB
488 /* fall through */
489 case NL80211_IFTYPE_MESH_POINT:
490 if (ieee80211_vif_is_mesh(&sdata->vif)) {
a3c9aa51
AY
491 /* other_bss and allmulti are always set on mesh
492 * ifaces */
493 local->fif_other_bss--;
0d143fe1 494 atomic_dec(&local->iff_allmultis);
a3c9aa51 495
a3c9aa51 496 ieee80211_configure_filter(local);
a3c9aa51 497
0d143fe1
JB
498 ieee80211_stop_mesh(sdata);
499 }
500 /* fall through */
501 default:
15db0b7f
JB
502 if (local->scan_sdata == sdata)
503 ieee80211_scan_cancel(local);
0d143fe1 504
97af7432
BC
505 /*
506 * Disable beaconing for AP and mesh, IBSS can't
507 * still be joined to a network at this point.
508 */
509 if (sdata->vif.type == NL80211_IFTYPE_AP ||
510 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
511 ieee80211_bss_info_change_notify(sdata,
512 BSS_CHANGED_BEACON_ENABLED);
513 }
514
0d143fe1
JB
515 conf.vif = &sdata->vif;
516 conf.type = sdata->vif.type;
517 conf.mac_addr = dev->dev_addr;
518 /* disable all keys for as long as this netdev is down */
519 ieee80211_disable_keys(sdata);
24487981 520 drv_remove_interface(local, &conf);
0d143fe1
JB
521 }
522
523 sdata->bss = NULL;
524
5cff20e6
JB
525 hw_reconf_flags |= __ieee80211_recalc_idle(local);
526
527 ieee80211_recalc_ps(local, -1);
528
0d143fe1 529 if (local->open_count == 0) {
ea77f12f 530 ieee80211_clear_tx_pending(local);
84f6a01c 531 ieee80211_stop_device(local);
0d143fe1 532
e8975581
JB
533 /* no reconfiguring after stop! */
534 hw_reconf_flags = 0;
0d143fe1
JB
535 }
536
e8975581
JB
537 /* do after stop to avoid reconfiguring when we stop anyway */
538 if (hw_reconf_flags)
539 ieee80211_hw_config(local, hw_reconf_flags);
540
5061b0c2
JB
541 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
542 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
543 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
544 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
545 if (info->control.vif == &sdata->vif) {
546 __skb_unlink(skb, &local->pending[i]);
547 dev_kfree_skb_irq(skb);
548 }
549 }
550 }
551 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
552
0d143fe1
JB
553 return 0;
554}
555
556static void ieee80211_set_multicast_list(struct net_device *dev)
557{
0d143fe1 558 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
b4a4bf5d 559 struct ieee80211_local *local = sdata->local;
0d143fe1
JB
560 int allmulti, promisc, sdata_allmulti, sdata_promisc;
561
562 allmulti = !!(dev->flags & IFF_ALLMULTI);
563 promisc = !!(dev->flags & IFF_PROMISC);
564 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
565 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
566
567 if (allmulti != sdata_allmulti) {
568 if (dev->flags & IFF_ALLMULTI)
569 atomic_inc(&local->iff_allmultis);
570 else
571 atomic_dec(&local->iff_allmultis);
572 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
573 }
574
575 if (promisc != sdata_promisc) {
576 if (dev->flags & IFF_PROMISC)
577 atomic_inc(&local->iff_promiscs);
578 else
579 atomic_dec(&local->iff_promiscs);
580 sdata->flags ^= IEEE80211_SDATA_PROMISC;
581 }
3b8d81e0
JB
582 spin_lock_bh(&local->filter_lock);
583 __dev_addr_sync(&local->mc_list, &local->mc_count,
584 &dev->mc_list, &dev->mc_count);
3b8d81e0 585 spin_unlock_bh(&local->filter_lock);
3ac64bee 586 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
0d143fe1
JB
587}
588
75636525
JB
589/*
590 * Called when the netdev is removed or, by the code below, before
591 * the interface type changes.
592 */
593static void ieee80211_teardown_sdata(struct net_device *dev)
f0706e82 594{
75636525
JB
595 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
596 struct ieee80211_local *local = sdata->local;
597 struct beacon_data *beacon;
598 struct sk_buff *skb;
599 int flushed;
f0706e82
JB
600 int i;
601
75636525
JB
602 /* free extra data */
603 ieee80211_free_keys(sdata);
604
aee14ceb
JM
605 ieee80211_debugfs_remove_netdev(sdata);
606
f0706e82 607 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
75636525
JB
608 __skb_queue_purge(&sdata->fragments[i].skb_list);
609 sdata->fragment_next = 0;
11a843b7 610
75636525 611 switch (sdata->vif.type) {
05c914fe 612 case NL80211_IFTYPE_AP:
75636525
JB
613 beacon = sdata->u.ap.beacon;
614 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
615 synchronize_rcu();
616 kfree(beacon);
3e122be0 617
75636525
JB
618 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
619 local->total_ps_buffered--;
620 dev_kfree_skb(skb);
621 }
622
623 break;
05c914fe 624 case NL80211_IFTYPE_MESH_POINT:
75636525 625 if (ieee80211_vif_is_mesh(&sdata->vif))
f698d856 626 mesh_rmc_free(sdata);
472dbc45 627 break;
05c914fe 628 case NL80211_IFTYPE_ADHOC:
af8cdcd8
JB
629 if (WARN_ON(sdata->u.ibss.presp))
630 kfree_skb(sdata->u.ibss.presp);
46900298
JB
631 break;
632 case NL80211_IFTYPE_STATION:
05c914fe
JB
633 case NL80211_IFTYPE_WDS:
634 case NL80211_IFTYPE_AP_VLAN:
635 case NL80211_IFTYPE_MONITOR:
75636525 636 break;
05c914fe
JB
637 case NL80211_IFTYPE_UNSPECIFIED:
638 case __NL80211_IFTYPE_AFTER_LAST:
75636525
JB
639 BUG();
640 break;
641 }
642
643 flushed = sta_info_flush(local, sdata);
644 WARN_ON(flushed);
f0706e82
JB
645}
646
587e729e
JB
647static const struct net_device_ops ieee80211_dataif_ops = {
648 .ndo_open = ieee80211_open,
649 .ndo_stop = ieee80211_stop,
650 .ndo_uninit = ieee80211_teardown_sdata,
651 .ndo_start_xmit = ieee80211_subif_start_xmit,
652 .ndo_set_multicast_list = ieee80211_set_multicast_list,
653 .ndo_change_mtu = ieee80211_change_mtu,
654 .ndo_set_mac_address = eth_mac_addr,
655};
656
657static const struct net_device_ops ieee80211_monitorif_ops = {
658 .ndo_open = ieee80211_open,
659 .ndo_stop = ieee80211_stop,
660 .ndo_uninit = ieee80211_teardown_sdata,
661 .ndo_start_xmit = ieee80211_monitor_start_xmit,
662 .ndo_set_multicast_list = ieee80211_set_multicast_list,
663 .ndo_change_mtu = ieee80211_change_mtu,
664 .ndo_set_mac_address = eth_mac_addr,
665};
666
667static void ieee80211_if_setup(struct net_device *dev)
668{
669 ether_setup(dev);
670 dev->netdev_ops = &ieee80211_dataif_ops;
587e729e
JB
671 dev->destructor = free_netdev;
672}
673
75636525
JB
674/*
675 * Helper function to initialise an interface to a specific type.
676 */
677static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
05c914fe 678 enum nl80211_iftype type)
f0706e82 679{
75636525
JB
680 /* clear type-dependent union */
681 memset(&sdata->u, 0, sizeof(sdata->u));
682
683 /* and set some type-dependent values */
684 sdata->vif.type = type;
587e729e 685 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
60719ffd 686 sdata->wdev.iftype = type;
75636525
JB
687
688 /* only monitor differs */
689 sdata->dev->type = ARPHRD_ETHER;
690
691 switch (type) {
05c914fe 692 case NL80211_IFTYPE_AP:
75636525
JB
693 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
694 INIT_LIST_HEAD(&sdata->u.ap.vlans);
695 break;
05c914fe 696 case NL80211_IFTYPE_STATION:
9c6bd790 697 ieee80211_sta_setup_sdata(sdata);
472dbc45 698 break;
46900298
JB
699 case NL80211_IFTYPE_ADHOC:
700 ieee80211_ibss_setup_sdata(sdata);
701 break;
05c914fe 702 case NL80211_IFTYPE_MESH_POINT:
75636525
JB
703 if (ieee80211_vif_is_mesh(&sdata->vif))
704 ieee80211_mesh_init_sdata(sdata);
705 break;
05c914fe 706 case NL80211_IFTYPE_MONITOR:
75636525 707 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
587e729e 708 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
75636525
JB
709 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
710 MONITOR_FLAG_OTHER_BSS;
711 break;
05c914fe
JB
712 case NL80211_IFTYPE_WDS:
713 case NL80211_IFTYPE_AP_VLAN:
75636525 714 break;
05c914fe
JB
715 case NL80211_IFTYPE_UNSPECIFIED:
716 case __NL80211_IFTYPE_AFTER_LAST:
75636525
JB
717 BUG();
718 break;
719 }
720
721 ieee80211_debugfs_add_netdev(sdata);
722}
723
f3947e2d 724int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
05c914fe 725 enum nl80211_iftype type)
75636525 726{
f3947e2d
JB
727 ASSERT_RTNL();
728
729 if (type == sdata->vif.type)
730 return 0;
731
e60c7744 732 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
dcebf45c
PR
733 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
734 type == NL80211_IFTYPE_ADHOC)
e60c7744
JB
735 return -EOPNOTSUPP;
736
f3947e2d
JB
737 /*
738 * We could, here, on changes between IBSS/STA/MESH modes,
739 * invoke an MLME function instead that disassociates etc.
740 * and goes into the requested mode.
741 */
742
743 if (netif_running(sdata->dev))
744 return -EBUSY;
745
75636525
JB
746 /* Purge and reset type-dependent state. */
747 ieee80211_teardown_sdata(sdata->dev);
748 ieee80211_setup_sdata(sdata, type);
749
750 /* reset some values that shouldn't be kept across type changes */
bda3933a 751 sdata->vif.bss_conf.basic_rates =
96dd22ac
JB
752 ieee80211_mandatory_rates(sdata->local,
753 sdata->local->hw.conf.channel->band);
75636525 754 sdata->drop_unencrypted = 0;
9bc383de
JB
755 if (type == NL80211_IFTYPE_STATION)
756 sdata->u.mgd.use_4addr = false;
f3947e2d
JB
757
758 return 0;
f0706e82
JB
759}
760
3e122be0 761int ieee80211_if_add(struct ieee80211_local *local, const char *name,
05c914fe 762 struct net_device **new_dev, enum nl80211_iftype type,
ee385855 763 struct vif_params *params)
f0706e82
JB
764{
765 struct net_device *ndev;
f0706e82 766 struct ieee80211_sub_if_data *sdata = NULL;
75636525 767 int ret, i;
f0706e82
JB
768
769 ASSERT_RTNL();
75636525 770
32bfd35d 771 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
f0706e82
JB
772 name, ieee80211_if_setup);
773 if (!ndev)
774 return -ENOMEM;
a272a720 775 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
f0706e82 776
f3994ece
JB
777 ndev->needed_headroom = local->tx_headroom +
778 4*6 /* four MAC addresses */
779 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
780 + 6 /* mesh */
781 + 8 /* rfc1042/bridge tunnel */
782 - ETH_HLEN /* ethernet hard_header_len */
783 + IEEE80211_ENCRYPT_HEADROOM;
784 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
785
f0706e82
JB
786 ret = dev_alloc_name(ndev, ndev->name);
787 if (ret < 0)
788 goto fail;
789
790 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
0adc23f5 791 memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
f0706e82
JB
792 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
793
3e122be0
JB
794 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
795 sdata = netdev_priv(ndev);
f0706e82 796 ndev->ieee80211_ptr = &sdata->wdev;
75636525
JB
797
798 /* initialise type-independent data */
f0706e82 799 sdata->wdev.wiphy = local->hw.wiphy;
f0706e82 800 sdata->local = local;
75636525
JB
801 sdata->dev = ndev;
802
803 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
804 skb_queue_head_init(&sdata->fragments[i].skb_list);
805
806 INIT_LIST_HEAD(&sdata->key_list);
807
808 sdata->force_unicast_rateidx = -1;
809 sdata->max_ratectrl_rateidx = -1;
810
811 /* setup type-dependent data */
812 ieee80211_setup_sdata(sdata, type);
f0706e82 813
9bc383de
JB
814 if (params) {
815 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
816 if (type == NL80211_IFTYPE_STATION)
817 sdata->u.mgd.use_4addr = params->use_4addr;
818 }
819
f0706e82
JB
820 ret = register_netdevice(ndev);
821 if (ret)
822 goto fail;
823
902acc78
JB
824 if (ieee80211_vif_is_mesh(&sdata->vif) &&
825 params && params->mesh_id_len)
472dbc45
JB
826 ieee80211_sdata_set_mesh_id(sdata,
827 params->mesh_id_len,
828 params->mesh_id);
ee385855 829
c771c9d8 830 mutex_lock(&local->iflist_mtx);
79010420 831 list_add_tail_rcu(&sdata->list, &local->interfaces);
c771c9d8 832 mutex_unlock(&local->iflist_mtx);
79010420 833
f0706e82
JB
834 if (new_dev)
835 *new_dev = ndev;
f0706e82 836
f0706e82
JB
837 return 0;
838
75636525 839 fail:
f0706e82
JB
840 free_netdev(ndev);
841 return ret;
842}
843
f698d856 844void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
f0706e82 845{
f0706e82 846 ASSERT_RTNL();
11a843b7 847
c771c9d8 848 mutex_lock(&sdata->local->iflist_mtx);
75636525 849 list_del_rcu(&sdata->list);
c771c9d8
JB
850 mutex_unlock(&sdata->local->iflist_mtx);
851
75636525 852 synchronize_rcu();
f698d856 853 unregister_netdevice(sdata->dev);
f0706e82
JB
854}
855
75636525
JB
856/*
857 * Remove all interfaces, may only be called at hardware unregistration
858 * time because it doesn't do RCU-safe list removals.
859 */
860void ieee80211_remove_interfaces(struct ieee80211_local *local)
f0706e82 861{
75636525 862 struct ieee80211_sub_if_data *sdata, *tmp;
efe117ab 863 LIST_HEAD(unreg_list);
f0706e82
JB
864
865 ASSERT_RTNL();
866
efe117ab 867 mutex_lock(&local->iflist_mtx);
75636525
JB
868 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
869 list_del(&sdata->list);
c771c9d8 870
efe117ab 871 unregister_netdevice_queue(sdata->dev, &unreg_list);
f0706e82 872 }
efe117ab
ED
873 mutex_unlock(&local->iflist_mtx);
874 unregister_netdevice_many(&unreg_list);
f0706e82 875}
5cff20e6
JB
876
877static u32 ieee80211_idle_off(struct ieee80211_local *local,
878 const char *reason)
879{
880 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
881 return 0;
882
883#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
884 printk(KERN_DEBUG "%s: device no longer idle - %s\n",
885 wiphy_name(local->hw.wiphy), reason);
886#endif
887
888 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
889 return IEEE80211_CONF_CHANGE_IDLE;
890}
891
892static u32 ieee80211_idle_on(struct ieee80211_local *local)
893{
894 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
895 return 0;
896
897#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
898 printk(KERN_DEBUG "%s: device now idle\n",
899 wiphy_name(local->hw.wiphy));
900#endif
901
902 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
903 return IEEE80211_CONF_CHANGE_IDLE;
904}
905
906u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
907{
908 struct ieee80211_sub_if_data *sdata;
909 int count = 0;
910
fbe9c429 911 if (local->scanning)
5cff20e6
JB
912 return ieee80211_idle_off(local, "scanning");
913
914 list_for_each_entry(sdata, &local->interfaces, list) {
915 if (!netif_running(sdata->dev))
916 continue;
917 /* do not count disabled managed interfaces */
918 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
77fdaa12
JB
919 !sdata->u.mgd.associated &&
920 list_empty(&sdata->u.mgd.work_list))
5cff20e6
JB
921 continue;
922 /* do not count unused IBSS interfaces */
923 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
924 !sdata->u.ibss.ssid_len)
925 continue;
926 /* count everything else */
927 count++;
928 }
929
930 if (!count)
931 return ieee80211_idle_on(local);
932 else
933 return ieee80211_idle_off(local, "in use");
934
935 return 0;
936}
937
938void ieee80211_recalc_idle(struct ieee80211_local *local)
939{
940 u32 chg;
941
942 mutex_lock(&local->iflist_mtx);
943 chg = __ieee80211_recalc_idle(local);
944 mutex_unlock(&local->iflist_mtx);
58905ca5
JB
945 if (chg)
946 ieee80211_hw_config(local, chg);
5cff20e6 947}