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iwlwifi: use correct DMA_MASK
[linux-2.6-block.git] / net / mac80211 / iface.c
CommitLineData
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
JB		 22#include "led.h"
23
24static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
25{
26 int meshhdrlen;
27 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
28
29 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
30
31 /* FIX: what would be proper limits for MTU?
32 * This interface uses 802.3 frames. */
33 if (new_mtu < 256 ||
34 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
35 return -EINVAL;
36 }
37
38#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
39 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
40#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
41 dev->mtu = new_mtu;
42 return 0;
43}
44
45static inline int identical_mac_addr_allowed(int type1, int type2)
46{
47 return type1 == NL80211_IFTYPE_MONITOR ||
48 type2 == NL80211_IFTYPE_MONITOR ||
49 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
50 (type1 == NL80211_IFTYPE_WDS &&
51 (type2 == NL80211_IFTYPE_WDS ||
52 type2 == NL80211_IFTYPE_AP)) ||
53 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
54 (type1 == NL80211_IFTYPE_AP_VLAN &&
55 (type2 == NL80211_IFTYPE_AP ||
56 type2 == NL80211_IFTYPE_AP_VLAN));
57}
58
59static int ieee80211_open(struct net_device *dev)
60{
61 struct ieee80211_sub_if_data *sdata, *nsdata;
62 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
63 struct sta_info *sta;
64 struct ieee80211_if_init_conf conf;
65 u32 changed = 0;
66 int res;
67 bool need_hw_reconfig = 0;
68 u8 null_addr[ETH_ALEN] = {0};
69
70 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
71
72 /* fail early if user set an invalid address */
73 if (compare_ether_addr(dev->dev_addr, null_addr) &&
74 !is_valid_ether_addr(dev->dev_addr))
75 return -EADDRNOTAVAIL;
76
77 /* we hold the RTNL here so can safely walk the list */
78 list_for_each_entry(nsdata, &local->interfaces, list) {
79 struct net_device *ndev = nsdata->dev;
80
81 if (ndev != dev && netif_running(ndev)) {
82 /*
83 * Allow only a single IBSS interface to be up at any
84 * time. This is restricted because beacon distribution
85 * cannot work properly if both are in the same IBSS.
86 *
87 * To remove this restriction we'd have to disallow them
88 * from setting the same SSID on different IBSS interfaces
89 * belonging to the same hardware. Then, however, we're
90 * faced with having to adopt two different TSF timers...
91 */
92 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
93 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
94 return -EBUSY;
95
96 /*
97 * The remaining checks are only performed for interfaces
98 * with the same MAC address.
99 */
100 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
101 continue;
102
103 /*
104 * check whether it may have the same address
105 */
106 if (!identical_mac_addr_allowed(sdata->vif.type,
107 nsdata->vif.type))
108 return -ENOTUNIQ;
109
110 /*
111 * can only add VLANs to enabled APs
112 */
113 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
114 nsdata->vif.type == NL80211_IFTYPE_AP)
115 sdata->bss = &nsdata->u.ap;
116 }
117 }
118
119 switch (sdata->vif.type) {
120 case NL80211_IFTYPE_WDS:
121 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
122 return -ENOLINK;
123 break;
124 case NL80211_IFTYPE_AP_VLAN:
125 if (!sdata->bss)
126 return -ENOLINK;
127 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
128 break;
129 case NL80211_IFTYPE_AP:
130 sdata->bss = &sdata->u.ap;
131 break;
132 case NL80211_IFTYPE_MESH_POINT:
133 if (!ieee80211_vif_is_mesh(&sdata->vif))
134 break;
135 /* mesh ifaces must set allmulti to forward mcast traffic */
136 atomic_inc(&local->iff_allmultis);
137 break;
138 case NL80211_IFTYPE_STATION:
139 case NL80211_IFTYPE_MONITOR:
140 case NL80211_IFTYPE_ADHOC:
141 /* no special treatment */
142 break;
143 case NL80211_IFTYPE_UNSPECIFIED:
144 case __NL80211_IFTYPE_AFTER_LAST:
145 /* cannot happen */
146 WARN_ON(1);
147 break;
148 }
149
150 if (local->open_count == 0) {
151 res = 0;
152 if (local->ops->start)
153 res = local->ops->start(local_to_hw(local));
154 if (res)
155 goto err_del_bss;
156 need_hw_reconfig = 1;
157 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
158 }
159
160 /*
161 * Check all interfaces and copy the hopefully now-present
162 * MAC address to those that have the special null one.
163 */
164 list_for_each_entry(nsdata, &local->interfaces, list) {
165 struct net_device *ndev = nsdata->dev;
166
167 /*
168 * No need to check netif_running since we do not allow
169 * it to start up with this invalid address.
170 */
171 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
172 memcpy(ndev->dev_addr,
173 local->hw.wiphy->perm_addr,
174 ETH_ALEN);
175 }
176
177 if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
178 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
179 ETH_ALEN);
180
181 /*
182 * Validate the MAC address for this device.
183 */
184 if (!is_valid_ether_addr(dev->dev_addr)) {
185 if (!local->open_count && local->ops->stop)
186 local->ops->stop(local_to_hw(local));
187 return -EADDRNOTAVAIL;
188 }
189
190 switch (sdata->vif.type) {
191 case NL80211_IFTYPE_AP_VLAN:
192 /* no need to tell driver */
193 break;
194 case NL80211_IFTYPE_MONITOR:
195 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
196 local->cooked_mntrs++;
197 break;
198 }
199
200 /* must be before the call to ieee80211_configure_filter */
201 local->monitors++;
202 if (local->monitors == 1)
203 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
204
205 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
206 local->fif_fcsfail++;
207 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
208 local->fif_plcpfail++;
209 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
210 local->fif_control++;
211 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
212 local->fif_other_bss++;
213
214 netif_addr_lock_bh(local->mdev);
215 ieee80211_configure_filter(local);
216 netif_addr_unlock_bh(local->mdev);
217 break;
218 case NL80211_IFTYPE_STATION:
219 case NL80211_IFTYPE_ADHOC:
220 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
221 /* fall through */
222 default:
223 conf.vif = &sdata->vif;
224 conf.type = sdata->vif.type;
225 conf.mac_addr = dev->dev_addr;
226 res = local->ops->add_interface(local_to_hw(local), &conf);
227 if (res)
228 goto err_stop;
229
230 if (ieee80211_vif_is_mesh(&sdata->vif))
231 ieee80211_start_mesh(sdata);
232 changed |= ieee80211_reset_erp_info(sdata);
233 ieee80211_bss_info_change_notify(sdata, changed);
234 ieee80211_enable_keys(sdata);
235
236 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
237 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
238 netif_carrier_off(dev);
239 else
240 netif_carrier_on(dev);
241 }
242
243 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
244 /* Create STA entry for the WDS peer */
245 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
246 GFP_KERNEL);
247 if (!sta) {
248 res = -ENOMEM;
249 goto err_del_interface;
250 }
251
252 /* no locking required since STA is not live yet */
253 sta->flags |= WLAN_STA_AUTHORIZED;
254
255 res = sta_info_insert(sta);
256 if (res) {
257 /* STA has been freed */
258 goto err_del_interface;
259 }
260 }
261
262 if (local->open_count == 0) {
263 res = dev_open(local->mdev);
264 WARN_ON(res);
265 if (res)
266 goto err_del_interface;
267 tasklet_enable(&local->tx_pending_tasklet);
268 tasklet_enable(&local->tasklet);
269 }
270
271 /*
272 * set_multicast_list will be invoked by the networking core
273 * which will check whether any increments here were done in
274 * error and sync them down to the hardware as filter flags.
275 */
276 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
277 atomic_inc(&local->iff_allmultis);
278
279 if (sdata->flags & IEEE80211_SDATA_PROMISC)
280 atomic_inc(&local->iff_promiscs);
281
282 local->open_count++;
283 if (need_hw_reconfig) {
284 ieee80211_hw_config(local);
285 /*
286 * set default queue parameters so drivers don't
287 * need to initialise the hardware if the hardware
288 * doesn't start up with sane defaults
289 */
290 ieee80211_set_wmm_default(sdata);
291 }
292
293 /*
294 * ieee80211_sta_work is disabled while network interface
295 * is down. Therefore, some configuration changes may not
296 * yet be effective. Trigger execution of ieee80211_sta_work
297 * to fix this.
298 */
299 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
300 sdata->vif.type == NL80211_IFTYPE_ADHOC) {
301 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
302 queue_work(local->hw.workqueue, &ifsta->work);
303 }
f0706e82 304
0d143fe1
JB		 305 netif_tx_start_all_queues(dev);
306
307 return 0;
308 err_del_interface:
309 local->ops->remove_interface(local_to_hw(local), &conf);
310 err_stop:
311 if (!local->open_count && local->ops->stop)
312 local->ops->stop(local_to_hw(local));
313 err_del_bss:
314 sdata->bss = NULL;
315 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
316 list_del(&sdata->u.vlan.list);
317 return res;
318}
319
320static int ieee80211_stop(struct net_device *dev)
321{
322 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
323 struct ieee80211_local *local = sdata->local;
324 struct ieee80211_if_init_conf conf;
325 struct sta_info *sta;
326
327 /*
328 * Stop TX on this interface first.
329 */
330 netif_tx_stop_all_queues(dev);
331
332 /*
333 * Now delete all active aggregation sessions.
334 */
335 rcu_read_lock();
336
337 list_for_each_entry_rcu(sta, &local->sta_list, list) {
338 if (sta->sdata == sdata)
17741cdc
JB		 339 ieee80211_sta_tear_down_BA_sessions(sdata,
340 sta->sta.addr);
0d143fe1
JB		 341 }
342
343 rcu_read_unlock();
344
345 /*
346 * Remove all stations associated with this interface.
347 *
348 * This must be done before calling ops->remove_interface()
349 * because otherwise we can later invoke ops->sta_notify()
350 * whenever the STAs are removed, and that invalidates driver
351 * assumptions about always getting a vif pointer that is valid
352 * (because if we remove a STA after ops->remove_interface()
353 * the driver will have removed the vif info already!)
354 *
355 * We could relax this and only unlink the stations from the
356 * hash table and list but keep them on a per-sdata list that
357 * will be inserted back again when the interface is brought
358 * up again, but I don't currently see a use case for that,
359 * except with WDS which gets a STA entry created when it is
360 * brought up.
361 */
362 sta_info_flush(local, sdata);
363
364 /*
365 * Don't count this interface for promisc/allmulti while it
366 * is down. dev_mc_unsync() will invoke set_multicast_list
367 * on the master interface which will sync these down to the
368 * hardware as filter flags.
369 */
370 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
371 atomic_dec(&local->iff_allmultis);
372
373 if (sdata->flags & IEEE80211_SDATA_PROMISC)
374 atomic_dec(&local->iff_promiscs);
375
376 dev_mc_unsync(local->mdev, dev);
377
378 /* APs need special treatment */
379 if (sdata->vif.type == NL80211_IFTYPE_AP) {
380 struct ieee80211_sub_if_data *vlan, *tmp;
381 struct beacon_data *old_beacon = sdata->u.ap.beacon;
382
383 /* remove beacon */
384 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
385 synchronize_rcu();
386 kfree(old_beacon);
387
388 /* down all dependent devices, that is VLANs */
389 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
390 u.vlan.list)
391 dev_close(vlan->dev);
392 WARN_ON(!list_empty(&sdata->u.ap.vlans));
393 }
394
395 local->open_count--;
396
397 switch (sdata->vif.type) {
398 case NL80211_IFTYPE_AP_VLAN:
399 list_del(&sdata->u.vlan.list);
400 /* no need to tell driver */
401 break;
402 case NL80211_IFTYPE_MONITOR:
403 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
404 local->cooked_mntrs--;
405 break;
406 }
407
408 local->monitors--;
409 if (local->monitors == 0)
410 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
411
412 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
413 local->fif_fcsfail--;
414 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
415 local->fif_plcpfail--;
416 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
417 local->fif_control--;
418 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
419 local->fif_other_bss--;
420
421 netif_addr_lock_bh(local->mdev);
422 ieee80211_configure_filter(local);
423 netif_addr_unlock_bh(local->mdev);
424 break;
425 case NL80211_IFTYPE_STATION:
426 case NL80211_IFTYPE_ADHOC:
427 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
428 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
429 del_timer_sync(&sdata->u.sta.timer);
430 /*
431 * If the timer fired while we waited for it, it will have
432 * requeued the work. Now the work will be running again
433 * but will not rearm the timer again because it checks
434 * whether the interface is running, which, at this point,
435 * it no longer is.
436 */
437 cancel_work_sync(&sdata->u.sta.work);
438 /*
439 * When we get here, the interface is marked down.
440 * Call synchronize_rcu() to wait for the RX path
441 * should it be using the interface and enqueuing
442 * frames at this very time on another CPU.
443 */
444 synchronize_rcu();
445 skb_queue_purge(&sdata->u.sta.skb_queue);
446
447 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
448 kfree(sdata->u.sta.extra_ie);
449 sdata->u.sta.extra_ie = NULL;
450 sdata->u.sta.extra_ie_len = 0;
451 /* fall through */
452 case NL80211_IFTYPE_MESH_POINT:
453 if (ieee80211_vif_is_mesh(&sdata->vif)) {
454 /* allmulti is always set on mesh ifaces */
455 atomic_dec(&local->iff_allmultis);
456 ieee80211_stop_mesh(sdata);
457 }
458 /* fall through */
459 default:
460 if (local->scan_sdata == sdata) {
461 if (!local->ops->hw_scan)
462 cancel_delayed_work_sync(&local->scan_work);
463 /*
464 * The software scan can no longer run now, so we can
465 * clear out the scan_sdata reference. However, the
466 * hardware scan may still be running. The complete
467 * function must be prepared to handle a NULL value.
468 */
469 local->scan_sdata = NULL;
470 /*
471 * The memory barrier guarantees that another CPU
472 * that is hardware-scanning will now see the fact
473 * that this interface is gone.
474 */
475 smp_mb();
476 /*
477 * If software scanning, complete the scan but since
478 * the scan_sdata is NULL already don't send out a
479 * scan event to userspace -- the scan is incomplete.
480 */
481 if (local->sw_scanning)
482 ieee80211_scan_completed(&local->hw);
483 }
484
485 conf.vif = &sdata->vif;
486 conf.type = sdata->vif.type;
487 conf.mac_addr = dev->dev_addr;
488 /* disable all keys for as long as this netdev is down */
489 ieee80211_disable_keys(sdata);
490 local->ops->remove_interface(local_to_hw(local), &conf);
491 }
492
493 sdata->bss = NULL;
494
495 if (local->open_count == 0) {
496 if (netif_running(local->mdev))
497 dev_close(local->mdev);
498
499 if (local->ops->stop)
500 local->ops->stop(local_to_hw(local));
501
502 ieee80211_led_radio(local, 0);
503
504 flush_workqueue(local->hw.workqueue);
505
506 tasklet_disable(&local->tx_pending_tasklet);
507 tasklet_disable(&local->tasklet);
508 }
509
510 return 0;
511}
512
513static void ieee80211_set_multicast_list(struct net_device *dev)
514{
515 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
516 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
517 int allmulti, promisc, sdata_allmulti, sdata_promisc;
518
519 allmulti = !!(dev->flags & IFF_ALLMULTI);
520 promisc = !!(dev->flags & IFF_PROMISC);
521 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
522 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
523
524 if (allmulti != sdata_allmulti) {
525 if (dev->flags & IFF_ALLMULTI)
526 atomic_inc(&local->iff_allmultis);
527 else
528 atomic_dec(&local->iff_allmultis);
529 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
530 }
531
532 if (promisc != sdata_promisc) {
533 if (dev->flags & IFF_PROMISC)
534 atomic_inc(&local->iff_promiscs);
535 else
536 atomic_dec(&local->iff_promiscs);
537 sdata->flags ^= IEEE80211_SDATA_PROMISC;
538 }
539
540 dev_mc_sync(local->mdev, dev);
541}
542
543static void ieee80211_if_setup(struct net_device *dev)
544{
545 ether_setup(dev);
546 dev->hard_start_xmit = ieee80211_subif_start_xmit;
547 dev->wireless_handlers = &ieee80211_iw_handler_def;
548 dev->set_multicast_list = ieee80211_set_multicast_list;
549 dev->change_mtu = ieee80211_change_mtu;
550 dev->open = ieee80211_open;
551 dev->stop = ieee80211_stop;
552 dev->destructor = free_netdev;
553 /* we will validate the address ourselves in ->open */
554 dev->validate_addr = NULL;
555}
75636525
JB		 556/*
557 * Called when the netdev is removed or, by the code below, before
558 * the interface type changes.
559 */
560static void ieee80211_teardown_sdata(struct net_device *dev)
f0706e82 561{
75636525
JB		 562 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
563 struct ieee80211_local *local = sdata->local;
564 struct beacon_data *beacon;
565 struct sk_buff *skb;
566 int flushed;
f0706e82
JB		 567 int i;
568
75636525
JB		 569 /* free extra data */
570 ieee80211_free_keys(sdata);
571
aee14ceb
JM		 572 ieee80211_debugfs_remove_netdev(sdata);
573
f0706e82 574 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
75636525
JB		 575 __skb_queue_purge(&sdata->fragments[i].skb_list);
576 sdata->fragment_next = 0;
11a843b7 577
75636525 578 switch (sdata->vif.type) {
05c914fe 579 case NL80211_IFTYPE_AP:
75636525
JB		 580 beacon = sdata->u.ap.beacon;
581 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
582 synchronize_rcu();
583 kfree(beacon);
3e122be0 584
75636525
JB		 585 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
586 local->total_ps_buffered--;
587 dev_kfree_skb(skb);
588 }
589
590 break;
05c914fe 591 case NL80211_IFTYPE_MESH_POINT:
75636525 592 if (ieee80211_vif_is_mesh(&sdata->vif))
f698d856 593 mesh_rmc_free(sdata);
472dbc45 594 break;
05c914fe
JB		 595 case NL80211_IFTYPE_STATION:
596 case NL80211_IFTYPE_ADHOC:
75636525
JB		 597 kfree(sdata->u.sta.extra_ie);
598 kfree(sdata->u.sta.assocreq_ies);
599 kfree(sdata->u.sta.assocresp_ies);
600 kfree_skb(sdata->u.sta.probe_resp);
601 break;
05c914fe
JB		 602 case NL80211_IFTYPE_WDS:
603 case NL80211_IFTYPE_AP_VLAN:
604 case NL80211_IFTYPE_MONITOR:
75636525 605 break;
05c914fe
JB		 606 case NL80211_IFTYPE_UNSPECIFIED:
607 case __NL80211_IFTYPE_AFTER_LAST:
75636525
JB		 608 BUG();
609 break;
610 }
611
612 flushed = sta_info_flush(local, sdata);
613 WARN_ON(flushed);
f0706e82
JB		 614}
615
75636525
JB		 616/*
617 * Helper function to initialise an interface to a specific type.
618 */
619static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
05c914fe 620 enum nl80211_iftype type)
f0706e82 621{
75636525
JB		 622 /* clear type-dependent union */
623 memset(&sdata->u, 0, sizeof(sdata->u));
624
625 /* and set some type-dependent values */
626 sdata->vif.type = type;
e16ce63c 627 sdata->dev->hard_start_xmit = ieee80211_subif_start_xmit;
60719ffd 628 sdata->wdev.iftype = type;
75636525
JB		 629
630 /* only monitor differs */
631 sdata->dev->type = ARPHRD_ETHER;
632
633 switch (type) {
05c914fe 634 case NL80211_IFTYPE_AP:
75636525
JB		 635 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
636 INIT_LIST_HEAD(&sdata->u.ap.vlans);
637 break;
05c914fe
JB		 638 case NL80211_IFTYPE_STATION:
639 case NL80211_IFTYPE_ADHOC:
9c6bd790 640 ieee80211_sta_setup_sdata(sdata);
472dbc45 641 break;
05c914fe 642 case NL80211_IFTYPE_MESH_POINT:
75636525
JB		 643 if (ieee80211_vif_is_mesh(&sdata->vif))
644 ieee80211_mesh_init_sdata(sdata);
645 break;
05c914fe 646 case NL80211_IFTYPE_MONITOR:
75636525
JB		 647 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
648 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
649 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
650 MONITOR_FLAG_OTHER_BSS;
651 break;
05c914fe
JB		 652 case NL80211_IFTYPE_WDS:
653 case NL80211_IFTYPE_AP_VLAN:
75636525 654 break;
05c914fe
JB		 655 case NL80211_IFTYPE_UNSPECIFIED:
656 case __NL80211_IFTYPE_AFTER_LAST:
75636525
JB		 657 BUG();
658 break;
659 }
660
661 ieee80211_debugfs_add_netdev(sdata);
662}
663
f3947e2d 664int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
05c914fe 665 enum nl80211_iftype type)
75636525 666{
f3947e2d
JB		 667 ASSERT_RTNL();
668
669 if (type == sdata->vif.type)
670 return 0;
671
672 /*
673 * We could, here, on changes between IBSS/STA/MESH modes,
674 * invoke an MLME function instead that disassociates etc.
675 * and goes into the requested mode.
676 */
677
678 if (netif_running(sdata->dev))
679 return -EBUSY;
680
75636525
JB		 681 /* Purge and reset type-dependent state. */
682 ieee80211_teardown_sdata(sdata->dev);
683 ieee80211_setup_sdata(sdata, type);
684
685 /* reset some values that shouldn't be kept across type changes */
96dd22ac
JB		 686 sdata->bss_conf.basic_rates =
687 ieee80211_mandatory_rates(sdata->local,
688 sdata->local->hw.conf.channel->band);
75636525 689 sdata->drop_unencrypted = 0;
f3947e2d
JB		 690
691 return 0;
f0706e82
JB		 692}
693
3e122be0 694int ieee80211_if_add(struct ieee80211_local *local, const char *name,
05c914fe 695 struct net_device **new_dev, enum nl80211_iftype type,
ee385855 696 struct vif_params *params)
f0706e82
JB		 697{
698 struct net_device *ndev;
f0706e82 699 struct ieee80211_sub_if_data *sdata = NULL;
75636525 700 int ret, i;
f0706e82
JB		 701
702 ASSERT_RTNL();
75636525 703
32bfd35d 704 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
f0706e82
JB		 705 name, ieee80211_if_setup);
706 if (!ndev)
707 return -ENOMEM;
708
f3994ece
JB		 709 ndev->needed_headroom = local->tx_headroom +
710 4*6 /* four MAC addresses */
711 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
712 + 6 /* mesh */
713 + 8 /* rfc1042/bridge tunnel */
714 - ETH_HLEN /* ethernet hard_header_len */
715 + IEEE80211_ENCRYPT_HEADROOM;
716 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
717
f0706e82
JB		 718 ret = dev_alloc_name(ndev, ndev->name);
719 if (ret < 0)
720 goto fail;
721
722 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
f0706e82
JB		 723 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
724
3e122be0
JB		 725 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
726 sdata = netdev_priv(ndev);
f0706e82 727 ndev->ieee80211_ptr = &sdata->wdev;
75636525
JB		 728
729 /* initialise type-independent data */
f0706e82 730 sdata->wdev.wiphy = local->hw.wiphy;
f0706e82 731 sdata->local = local;
75636525
JB		 732 sdata->dev = ndev;
733
734 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
735 skb_queue_head_init(&sdata->fragments[i].skb_list);
736
737 INIT_LIST_HEAD(&sdata->key_list);
738
739 sdata->force_unicast_rateidx = -1;
740 sdata->max_ratectrl_rateidx = -1;
741
742 /* setup type-dependent data */
743 ieee80211_setup_sdata(sdata, type);
f0706e82
JB		 744
745 ret = register_netdevice(ndev);
746 if (ret)
747 goto fail;
748
75636525 749 ndev->uninit = ieee80211_teardown_sdata;
f0706e82 750
902acc78
JB		 751 if (ieee80211_vif_is_mesh(&sdata->vif) &&
752 params && params->mesh_id_len)
472dbc45
JB		 753 ieee80211_sdata_set_mesh_id(sdata,
754 params->mesh_id_len,
755 params->mesh_id);
ee385855 756
79010420
JB		 757 list_add_tail_rcu(&sdata->list, &local->interfaces);
758
f0706e82
JB		 759 if (new_dev)
760 *new_dev = ndev;
f0706e82 761
f0706e82
JB		 762 return 0;
763
75636525 764 fail:
f0706e82
JB		 765 free_netdev(ndev);
766 return ret;
767}
768
f698d856 769void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
f0706e82 770{
f0706e82 771 ASSERT_RTNL();
11a843b7 772
75636525
JB		 773 list_del_rcu(&sdata->list);
774 synchronize_rcu();
f698d856 775 unregister_netdevice(sdata->dev);
f0706e82
JB		 776}
777
75636525
JB		 778/*
779 * Remove all interfaces, may only be called at hardware unregistration
780 * time because it doesn't do RCU-safe list removals.
781 */
782void ieee80211_remove_interfaces(struct ieee80211_local *local)
f0706e82 783{
75636525 784 struct ieee80211_sub_if_data *sdata, *tmp;
f0706e82
JB		 785
786 ASSERT_RTNL();
787
75636525
JB		 788 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
789 list_del(&sdata->list);
790 unregister_netdevice(sdata->dev);
f0706e82 791 }
f0706e82 792}
Linux 6.x block layer and io_uring tree(s)