blob: 8336fee68d3e05b717047e4d8a1ac5f3623542a8 [file] [log] [blame]
Jiri Bencf0706e822007-05-05 11:45:53 -07001/*
Johannes Berg0d143fe2008-09-11 00:01:59 +02002 * Interface handling (except master interface)
3 *
Jiri Bencf0706e822007-05-05 11:45:53 -07004 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
Johannes Berg75636522008-07-09 14:40:35 +02007 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
Jiri Bencf0706e822007-05-05 11:45:53 -07008 *
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"
Jiri Bence9f207f2007-05-05 11:46:38 -070020#include "debugfs_netdev.h"
Luis Carlos Coboee385852008-02-23 15:17:11 +010021#include "mesh.h"
Johannes Berg0d143fe2008-09-11 00:01:59 +020022#include "led.h"
Jiri Bencf0706e822007-05-05 11:45:53 -070023
Johannes Berg0d143fe2008-09-11 00:01:59 +020024static 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{
Johannes Bergb4a4bf52008-09-26 13:34:54 +020061 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
62 struct ieee80211_sub_if_data *nsdata;
63 struct ieee80211_local *local = sdata->local;
Johannes Berg0d143fe2008-09-11 00:01:59 +020064 struct sta_info *sta;
65 struct ieee80211_if_init_conf conf;
66 u32 changed = 0;
67 int res;
68 bool need_hw_reconfig = 0;
69 u8 null_addr[ETH_ALEN] = {0};
70
Johannes Berg0d143fe2008-09-11 00:01:59 +020071 /* fail early if user set an invalid address */
72 if (compare_ether_addr(dev->dev_addr, null_addr) &&
73 !is_valid_ether_addr(dev->dev_addr))
74 return -EADDRNOTAVAIL;
75
76 /* we hold the RTNL here so can safely walk the list */
77 list_for_each_entry(nsdata, &local->interfaces, list) {
78 struct net_device *ndev = nsdata->dev;
79
80 if (ndev != dev && netif_running(ndev)) {
81 /*
82 * Allow only a single IBSS interface to be up at any
83 * time. This is restricted because beacon distribution
84 * cannot work properly if both are in the same IBSS.
85 *
86 * To remove this restriction we'd have to disallow them
87 * from setting the same SSID on different IBSS interfaces
88 * belonging to the same hardware. Then, however, we're
89 * faced with having to adopt two different TSF timers...
90 */
91 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
92 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
93 return -EBUSY;
94
95 /*
96 * The remaining checks are only performed for interfaces
97 * with the same MAC address.
98 */
99 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
100 continue;
101
102 /*
103 * check whether it may have the same address
104 */
105 if (!identical_mac_addr_allowed(sdata->vif.type,
106 nsdata->vif.type))
107 return -ENOTUNIQ;
108
109 /*
110 * can only add VLANs to enabled APs
111 */
112 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
113 nsdata->vif.type == NL80211_IFTYPE_AP)
114 sdata->bss = &nsdata->u.ap;
115 }
116 }
117
118 switch (sdata->vif.type) {
119 case NL80211_IFTYPE_WDS:
120 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
121 return -ENOLINK;
122 break;
123 case NL80211_IFTYPE_AP_VLAN:
124 if (!sdata->bss)
125 return -ENOLINK;
126 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
127 break;
128 case NL80211_IFTYPE_AP:
129 sdata->bss = &sdata->u.ap;
130 break;
131 case NL80211_IFTYPE_MESH_POINT:
132 if (!ieee80211_vif_is_mesh(&sdata->vif))
133 break;
134 /* mesh ifaces must set allmulti to forward mcast traffic */
135 atomic_inc(&local->iff_allmultis);
136 break;
137 case NL80211_IFTYPE_STATION:
138 case NL80211_IFTYPE_MONITOR:
139 case NL80211_IFTYPE_ADHOC:
140 /* no special treatment */
141 break;
142 case NL80211_IFTYPE_UNSPECIFIED:
143 case __NL80211_IFTYPE_AFTER_LAST:
144 /* cannot happen */
145 WARN_ON(1);
146 break;
147 }
148
149 if (local->open_count == 0) {
150 res = 0;
151 if (local->ops->start)
152 res = local->ops->start(local_to_hw(local));
153 if (res)
154 goto err_del_bss;
155 need_hw_reconfig = 1;
156 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
157 }
158
159 /*
160 * Check all interfaces and copy the hopefully now-present
161 * MAC address to those that have the special null one.
162 */
163 list_for_each_entry(nsdata, &local->interfaces, list) {
164 struct net_device *ndev = nsdata->dev;
165
166 /*
167 * No need to check netif_running since we do not allow
168 * it to start up with this invalid address.
169 */
170 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
171 memcpy(ndev->dev_addr,
172 local->hw.wiphy->perm_addr,
173 ETH_ALEN);
174 }
175
176 if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
177 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
178 ETH_ALEN);
179
180 /*
181 * Validate the MAC address for this device.
182 */
183 if (!is_valid_ether_addr(dev->dev_addr)) {
184 if (!local->open_count && local->ops->stop)
185 local->ops->stop(local_to_hw(local));
186 return -EADDRNOTAVAIL;
187 }
188
189 switch (sdata->vif.type) {
190 case NL80211_IFTYPE_AP_VLAN:
191 /* no need to tell driver */
192 break;
193 case NL80211_IFTYPE_MONITOR:
194 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
195 local->cooked_mntrs++;
196 break;
197 }
198
199 /* must be before the call to ieee80211_configure_filter */
200 local->monitors++;
201 if (local->monitors == 1)
202 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
203
204 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
205 local->fif_fcsfail++;
206 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
207 local->fif_plcpfail++;
208 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
209 local->fif_control++;
210 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
211 local->fif_other_bss++;
212
213 netif_addr_lock_bh(local->mdev);
214 ieee80211_configure_filter(local);
215 netif_addr_unlock_bh(local->mdev);
216 break;
217 case NL80211_IFTYPE_STATION:
218 case NL80211_IFTYPE_ADHOC:
219 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
220 /* fall through */
221 default:
222 conf.vif = &sdata->vif;
223 conf.type = sdata->vif.type;
224 conf.mac_addr = dev->dev_addr;
225 res = local->ops->add_interface(local_to_hw(local), &conf);
226 if (res)
227 goto err_stop;
228
229 if (ieee80211_vif_is_mesh(&sdata->vif))
230 ieee80211_start_mesh(sdata);
231 changed |= ieee80211_reset_erp_info(sdata);
232 ieee80211_bss_info_change_notify(sdata, changed);
233 ieee80211_enable_keys(sdata);
234
235 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
236 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
237 netif_carrier_off(dev);
238 else
239 netif_carrier_on(dev);
240 }
241
242 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
243 /* Create STA entry for the WDS peer */
244 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
245 GFP_KERNEL);
246 if (!sta) {
247 res = -ENOMEM;
248 goto err_del_interface;
249 }
250
251 /* no locking required since STA is not live yet */
252 sta->flags |= WLAN_STA_AUTHORIZED;
253
254 res = sta_info_insert(sta);
255 if (res) {
256 /* STA has been freed */
257 goto err_del_interface;
258 }
259 }
260
261 if (local->open_count == 0) {
262 res = dev_open(local->mdev);
263 WARN_ON(res);
264 if (res)
265 goto err_del_interface;
266 tasklet_enable(&local->tx_pending_tasklet);
267 tasklet_enable(&local->tasklet);
268 }
269
270 /*
271 * set_multicast_list will be invoked by the networking core
272 * which will check whether any increments here were done in
273 * error and sync them down to the hardware as filter flags.
274 */
275 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
276 atomic_inc(&local->iff_allmultis);
277
278 if (sdata->flags & IEEE80211_SDATA_PROMISC)
279 atomic_inc(&local->iff_promiscs);
280
281 local->open_count++;
282 if (need_hw_reconfig) {
283 ieee80211_hw_config(local);
284 /*
285 * set default queue parameters so drivers don't
286 * need to initialise the hardware if the hardware
287 * doesn't start up with sane defaults
288 */
289 ieee80211_set_wmm_default(sdata);
290 }
291
292 /*
293 * ieee80211_sta_work is disabled while network interface
294 * is down. Therefore, some configuration changes may not
295 * yet be effective. Trigger execution of ieee80211_sta_work
296 * to fix this.
297 */
298 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
299 sdata->vif.type == NL80211_IFTYPE_ADHOC) {
300 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
301 queue_work(local->hw.workqueue, &ifsta->work);
302 }
303
304 netif_tx_start_all_queues(dev);
305
306 return 0;
307 err_del_interface:
308 local->ops->remove_interface(local_to_hw(local), &conf);
309 err_stop:
310 if (!local->open_count && local->ops->stop)
311 local->ops->stop(local_to_hw(local));
312 err_del_bss:
313 sdata->bss = NULL;
314 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
315 list_del(&sdata->u.vlan.list);
316 return res;
317}
318
319static int ieee80211_stop(struct net_device *dev)
320{
321 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
322 struct ieee80211_local *local = sdata->local;
323 struct ieee80211_if_init_conf conf;
324 struct sta_info *sta;
325
326 /*
327 * Stop TX on this interface first.
328 */
329 netif_tx_stop_all_queues(dev);
330
331 /*
332 * Now delete all active aggregation sessions.
333 */
334 rcu_read_lock();
335
336 list_for_each_entry_rcu(sta, &local->sta_list, list) {
337 if (sta->sdata == sdata)
Johannes Berg17741cd2008-09-11 00:02:02 +0200338 ieee80211_sta_tear_down_BA_sessions(sdata,
339 sta->sta.addr);
Johannes Berg0d143fe2008-09-11 00:01:59 +0200340 }
341
342 rcu_read_unlock();
343
344 /*
345 * Remove all stations associated with this interface.
346 *
347 * This must be done before calling ops->remove_interface()
348 * because otherwise we can later invoke ops->sta_notify()
349 * whenever the STAs are removed, and that invalidates driver
350 * assumptions about always getting a vif pointer that is valid
351 * (because if we remove a STA after ops->remove_interface()
352 * the driver will have removed the vif info already!)
353 *
354 * We could relax this and only unlink the stations from the
355 * hash table and list but keep them on a per-sdata list that
356 * will be inserted back again when the interface is brought
357 * up again, but I don't currently see a use case for that,
358 * except with WDS which gets a STA entry created when it is
359 * brought up.
360 */
361 sta_info_flush(local, sdata);
362
363 /*
364 * Don't count this interface for promisc/allmulti while it
365 * is down. dev_mc_unsync() will invoke set_multicast_list
366 * on the master interface which will sync these down to the
367 * hardware as filter flags.
368 */
369 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
370 atomic_dec(&local->iff_allmultis);
371
372 if (sdata->flags & IEEE80211_SDATA_PROMISC)
373 atomic_dec(&local->iff_promiscs);
374
375 dev_mc_unsync(local->mdev, dev);
376
377 /* APs need special treatment */
378 if (sdata->vif.type == NL80211_IFTYPE_AP) {
379 struct ieee80211_sub_if_data *vlan, *tmp;
380 struct beacon_data *old_beacon = sdata->u.ap.beacon;
381
382 /* remove beacon */
383 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
384 synchronize_rcu();
385 kfree(old_beacon);
386
387 /* down all dependent devices, that is VLANs */
388 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
389 u.vlan.list)
390 dev_close(vlan->dev);
391 WARN_ON(!list_empty(&sdata->u.ap.vlans));
392 }
393
394 local->open_count--;
395
396 switch (sdata->vif.type) {
397 case NL80211_IFTYPE_AP_VLAN:
398 list_del(&sdata->u.vlan.list);
399 /* no need to tell driver */
400 break;
401 case NL80211_IFTYPE_MONITOR:
402 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
403 local->cooked_mntrs--;
404 break;
405 }
406
407 local->monitors--;
408 if (local->monitors == 0)
409 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
410
411 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
412 local->fif_fcsfail--;
413 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
414 local->fif_plcpfail--;
415 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
416 local->fif_control--;
417 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
418 local->fif_other_bss--;
419
420 netif_addr_lock_bh(local->mdev);
421 ieee80211_configure_filter(local);
422 netif_addr_unlock_bh(local->mdev);
423 break;
424 case NL80211_IFTYPE_STATION:
425 case NL80211_IFTYPE_ADHOC:
426 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
427 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
428 del_timer_sync(&sdata->u.sta.timer);
429 /*
430 * If the timer fired while we waited for it, it will have
431 * requeued the work. Now the work will be running again
432 * but will not rearm the timer again because it checks
433 * whether the interface is running, which, at this point,
434 * it no longer is.
435 */
436 cancel_work_sync(&sdata->u.sta.work);
437 /*
438 * When we get here, the interface is marked down.
439 * Call synchronize_rcu() to wait for the RX path
440 * should it be using the interface and enqueuing
441 * frames at this very time on another CPU.
442 */
443 synchronize_rcu();
444 skb_queue_purge(&sdata->u.sta.skb_queue);
445
446 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
447 kfree(sdata->u.sta.extra_ie);
448 sdata->u.sta.extra_ie = NULL;
449 sdata->u.sta.extra_ie_len = 0;
450 /* fall through */
451 case NL80211_IFTYPE_MESH_POINT:
452 if (ieee80211_vif_is_mesh(&sdata->vif)) {
453 /* allmulti is always set on mesh ifaces */
454 atomic_dec(&local->iff_allmultis);
455 ieee80211_stop_mesh(sdata);
456 }
457 /* fall through */
458 default:
459 if (local->scan_sdata == sdata) {
460 if (!local->ops->hw_scan)
461 cancel_delayed_work_sync(&local->scan_work);
462 /*
463 * The software scan can no longer run now, so we can
464 * clear out the scan_sdata reference. However, the
465 * hardware scan may still be running. The complete
466 * function must be prepared to handle a NULL value.
467 */
468 local->scan_sdata = NULL;
469 /*
470 * The memory barrier guarantees that another CPU
471 * that is hardware-scanning will now see the fact
472 * that this interface is gone.
473 */
474 smp_mb();
475 /*
476 * If software scanning, complete the scan but since
477 * the scan_sdata is NULL already don't send out a
478 * scan event to userspace -- the scan is incomplete.
479 */
480 if (local->sw_scanning)
481 ieee80211_scan_completed(&local->hw);
482 }
483
484 conf.vif = &sdata->vif;
485 conf.type = sdata->vif.type;
486 conf.mac_addr = dev->dev_addr;
487 /* disable all keys for as long as this netdev is down */
488 ieee80211_disable_keys(sdata);
489 local->ops->remove_interface(local_to_hw(local), &conf);
490 }
491
492 sdata->bss = NULL;
493
494 if (local->open_count == 0) {
495 if (netif_running(local->mdev))
496 dev_close(local->mdev);
497
498 if (local->ops->stop)
499 local->ops->stop(local_to_hw(local));
500
501 ieee80211_led_radio(local, 0);
502
503 flush_workqueue(local->hw.workqueue);
504
505 tasklet_disable(&local->tx_pending_tasklet);
506 tasklet_disable(&local->tasklet);
507 }
508
509 return 0;
510}
511
512static void ieee80211_set_multicast_list(struct net_device *dev)
513{
Johannes Berg0d143fe2008-09-11 00:01:59 +0200514 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergb4a4bf52008-09-26 13:34:54 +0200515 struct ieee80211_local *local = sdata->local;
Johannes Berg0d143fe2008-09-11 00:01:59 +0200516 int allmulti, promisc, sdata_allmulti, sdata_promisc;
517
518 allmulti = !!(dev->flags & IFF_ALLMULTI);
519 promisc = !!(dev->flags & IFF_PROMISC);
520 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
521 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
522
523 if (allmulti != sdata_allmulti) {
524 if (dev->flags & IFF_ALLMULTI)
525 atomic_inc(&local->iff_allmultis);
526 else
527 atomic_dec(&local->iff_allmultis);
528 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
529 }
530
531 if (promisc != sdata_promisc) {
532 if (dev->flags & IFF_PROMISC)
533 atomic_inc(&local->iff_promiscs);
534 else
535 atomic_dec(&local->iff_promiscs);
536 sdata->flags ^= IEEE80211_SDATA_PROMISC;
537 }
538
539 dev_mc_sync(local->mdev, dev);
540}
541
542static void ieee80211_if_setup(struct net_device *dev)
543{
544 ether_setup(dev);
545 dev->hard_start_xmit = ieee80211_subif_start_xmit;
546 dev->wireless_handlers = &ieee80211_iw_handler_def;
547 dev->set_multicast_list = ieee80211_set_multicast_list;
548 dev->change_mtu = ieee80211_change_mtu;
549 dev->open = ieee80211_open;
550 dev->stop = ieee80211_stop;
551 dev->destructor = free_netdev;
552 /* we will validate the address ourselves in ->open */
553 dev->validate_addr = NULL;
554}
Johannes Berg75636522008-07-09 14:40:35 +0200555/*
556 * Called when the netdev is removed or, by the code below, before
557 * the interface type changes.
558 */
559static void ieee80211_teardown_sdata(struct net_device *dev)
Jiri Bencf0706e822007-05-05 11:45:53 -0700560{
Johannes Berg75636522008-07-09 14:40:35 +0200561 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
562 struct ieee80211_local *local = sdata->local;
563 struct beacon_data *beacon;
564 struct sk_buff *skb;
565 int flushed;
Jiri Bencf0706e822007-05-05 11:45:53 -0700566 int i;
567
Johannes Berg75636522008-07-09 14:40:35 +0200568 /* free extra data */
569 ieee80211_free_keys(sdata);
Jiri Bencf0706e822007-05-05 11:45:53 -0700570
Jouni Malinenaee14ce2008-09-09 16:33:15 +0200571 ieee80211_debugfs_remove_netdev(sdata);
572
Johannes Berg988c0f72008-04-17 19:21:22 +0200573 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
Jiri Bencf0706e822007-05-05 11:45:53 -0700574 __skb_queue_purge(&sdata->fragments[i].skb_list);
Johannes Berg75636522008-07-09 14:40:35 +0200575 sdata->fragment_next = 0;
576
577 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200578 case NL80211_IFTYPE_AP:
Johannes Berg75636522008-07-09 14:40:35 +0200579 beacon = sdata->u.ap.beacon;
580 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
581 synchronize_rcu();
582 kfree(beacon);
583
584 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
585 local->total_ps_buffered--;
586 dev_kfree_skb(skb);
587 }
588
589 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200590 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg75636522008-07-09 14:40:35 +0200591 if (ieee80211_vif_is_mesh(&sdata->vif))
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200592 mesh_rmc_free(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200593 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200594 case NL80211_IFTYPE_STATION:
595 case NL80211_IFTYPE_ADHOC:
Johannes Berg75636522008-07-09 14:40:35 +0200596 kfree(sdata->u.sta.extra_ie);
597 kfree(sdata->u.sta.assocreq_ies);
598 kfree(sdata->u.sta.assocresp_ies);
599 kfree_skb(sdata->u.sta.probe_resp);
600 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200601 case NL80211_IFTYPE_WDS:
602 case NL80211_IFTYPE_AP_VLAN:
603 case NL80211_IFTYPE_MONITOR:
Johannes Berg75636522008-07-09 14:40:35 +0200604 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200605 case NL80211_IFTYPE_UNSPECIFIED:
606 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Berg75636522008-07-09 14:40:35 +0200607 BUG();
608 break;
609 }
610
611 flushed = sta_info_flush(local, sdata);
612 WARN_ON(flushed);
Jiri Bencf0706e822007-05-05 11:45:53 -0700613}
614
Johannes Berg75636522008-07-09 14:40:35 +0200615/*
616 * Helper function to initialise an interface to a specific type.
617 */
618static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
Johannes Berg05c914f2008-09-11 00:01:58 +0200619 enum nl80211_iftype type)
Johannes Berg75636522008-07-09 14:40:35 +0200620{
Johannes Berg75636522008-07-09 14:40:35 +0200621 /* clear type-dependent union */
622 memset(&sdata->u, 0, sizeof(sdata->u));
623
624 /* and set some type-dependent values */
625 sdata->vif.type = type;
Abhijeet Kolekare16ce632008-09-12 13:44:08 -0700626 sdata->dev->hard_start_xmit = ieee80211_subif_start_xmit;
Johannes Berg60719ff2008-09-16 14:55:09 +0200627 sdata->wdev.iftype = type;
Johannes Berg75636522008-07-09 14:40:35 +0200628
629 /* only monitor differs */
630 sdata->dev->type = ARPHRD_ETHER;
631
632 switch (type) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200633 case NL80211_IFTYPE_AP:
Johannes Berg75636522008-07-09 14:40:35 +0200634 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
635 INIT_LIST_HEAD(&sdata->u.ap.vlans);
636 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200637 case NL80211_IFTYPE_STATION:
638 case NL80211_IFTYPE_ADHOC:
Johannes Berg9c6bd792008-09-11 00:01:52 +0200639 ieee80211_sta_setup_sdata(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200640 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200641 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg75636522008-07-09 14:40:35 +0200642 if (ieee80211_vif_is_mesh(&sdata->vif))
643 ieee80211_mesh_init_sdata(sdata);
644 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200645 case NL80211_IFTYPE_MONITOR:
Johannes Berg75636522008-07-09 14:40:35 +0200646 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
647 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
648 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
649 MONITOR_FLAG_OTHER_BSS;
650 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200651 case NL80211_IFTYPE_WDS:
652 case NL80211_IFTYPE_AP_VLAN:
Johannes Berg75636522008-07-09 14:40:35 +0200653 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200654 case NL80211_IFTYPE_UNSPECIFIED:
655 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Berg75636522008-07-09 14:40:35 +0200656 BUG();
657 break;
658 }
659
660 ieee80211_debugfs_add_netdev(sdata);
661}
662
Johannes Bergf3947e22008-07-09 14:40:36 +0200663int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
Johannes Berg05c914f2008-09-11 00:01:58 +0200664 enum nl80211_iftype type)
Johannes Berg75636522008-07-09 14:40:35 +0200665{
Johannes Bergf3947e22008-07-09 14:40:36 +0200666 ASSERT_RTNL();
667
668 if (type == sdata->vif.type)
669 return 0;
670
671 /*
672 * We could, here, on changes between IBSS/STA/MESH modes,
673 * invoke an MLME function instead that disassociates etc.
674 * and goes into the requested mode.
675 */
676
677 if (netif_running(sdata->dev))
678 return -EBUSY;
679
Johannes Berg75636522008-07-09 14:40:35 +0200680 /* Purge and reset type-dependent state. */
681 ieee80211_teardown_sdata(sdata->dev);
682 ieee80211_setup_sdata(sdata, type);
683
684 /* reset some values that shouldn't be kept across type changes */
Johannes Berg96dd22a2008-09-11 00:01:57 +0200685 sdata->bss_conf.basic_rates =
686 ieee80211_mandatory_rates(sdata->local,
687 sdata->local->hw.conf.channel->band);
Johannes Berg75636522008-07-09 14:40:35 +0200688 sdata->drop_unencrypted = 0;
Johannes Bergf3947e22008-07-09 14:40:36 +0200689
690 return 0;
Johannes Berg75636522008-07-09 14:40:35 +0200691}
692
Johannes Berg3e122be2008-07-09 14:40:34 +0200693int ieee80211_if_add(struct ieee80211_local *local, const char *name,
Johannes Berg05c914f2008-09-11 00:01:58 +0200694 struct net_device **new_dev, enum nl80211_iftype type,
Luis Carlos Coboee385852008-02-23 15:17:11 +0100695 struct vif_params *params)
Jiri Bencf0706e822007-05-05 11:45:53 -0700696{
697 struct net_device *ndev;
Jiri Bencf0706e822007-05-05 11:45:53 -0700698 struct ieee80211_sub_if_data *sdata = NULL;
Johannes Berg75636522008-07-09 14:40:35 +0200699 int ret, i;
Jiri Bencf0706e822007-05-05 11:45:53 -0700700
701 ASSERT_RTNL();
Johannes Berg75636522008-07-09 14:40:35 +0200702
Johannes Berg32bfd352007-12-19 01:31:26 +0100703 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
Jiri Bencf0706e822007-05-05 11:45:53 -0700704 name, ieee80211_if_setup);
705 if (!ndev)
706 return -ENOMEM;
707
Johannes Bergf3994ec2008-05-12 20:51:44 -0700708 ndev->needed_headroom = local->tx_headroom +
709 4*6 /* four MAC addresses */
710 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
711 + 6 /* mesh */
712 + 8 /* rfc1042/bridge tunnel */
713 - ETH_HLEN /* ethernet hard_header_len */
714 + IEEE80211_ENCRYPT_HEADROOM;
715 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
716
Jiri Bencf0706e822007-05-05 11:45:53 -0700717 ret = dev_alloc_name(ndev, ndev->name);
718 if (ret < 0)
719 goto fail;
720
721 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
Jiri Bencf0706e822007-05-05 11:45:53 -0700722 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
723
Johannes Berg3e122be2008-07-09 14:40:34 +0200724 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
725 sdata = netdev_priv(ndev);
Jiri Bencf0706e822007-05-05 11:45:53 -0700726 ndev->ieee80211_ptr = &sdata->wdev;
Johannes Berg75636522008-07-09 14:40:35 +0200727
728 /* initialise type-independent data */
Jiri Bencf0706e822007-05-05 11:45:53 -0700729 sdata->wdev.wiphy = local->hw.wiphy;
Jiri Bencf0706e822007-05-05 11:45:53 -0700730 sdata->local = local;
Johannes Berg75636522008-07-09 14:40:35 +0200731 sdata->dev = ndev;
732
733 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
734 skb_queue_head_init(&sdata->fragments[i].skb_list);
735
736 INIT_LIST_HEAD(&sdata->key_list);
737
738 sdata->force_unicast_rateidx = -1;
739 sdata->max_ratectrl_rateidx = -1;
740
741 /* setup type-dependent data */
742 ieee80211_setup_sdata(sdata, type);
Jiri Bencf0706e822007-05-05 11:45:53 -0700743
744 ret = register_netdevice(ndev);
745 if (ret)
746 goto fail;
747
Johannes Berg75636522008-07-09 14:40:35 +0200748 ndev->uninit = ieee80211_teardown_sdata;
Jiri Bencf0706e822007-05-05 11:45:53 -0700749
Johannes Berg902acc72008-02-23 15:17:19 +0100750 if (ieee80211_vif_is_mesh(&sdata->vif) &&
751 params && params->mesh_id_len)
Johannes Berg472dbc42008-09-11 00:01:49 +0200752 ieee80211_sdata_set_mesh_id(sdata,
753 params->mesh_id_len,
754 params->mesh_id);
Luis Carlos Coboee385852008-02-23 15:17:11 +0100755
Johannes Berg79010422007-09-18 17:29:21 -0400756 list_add_tail_rcu(&sdata->list, &local->interfaces);
757
Jiri Bencf0706e822007-05-05 11:45:53 -0700758 if (new_dev)
759 *new_dev = ndev;
Jiri Bencf0706e822007-05-05 11:45:53 -0700760
Jiri Bencf0706e822007-05-05 11:45:53 -0700761 return 0;
762
Johannes Berg75636522008-07-09 14:40:35 +0200763 fail:
Jiri Bencf0706e822007-05-05 11:45:53 -0700764 free_netdev(ndev);
765 return ret;
766}
767
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200768void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e822007-05-05 11:45:53 -0700769{
Jiri Bencf0706e822007-05-05 11:45:53 -0700770 ASSERT_RTNL();
Johannes Berg11a843b2007-08-28 17:01:55 -0400771
Johannes Berg75636522008-07-09 14:40:35 +0200772 list_del_rcu(&sdata->list);
773 synchronize_rcu();
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200774 unregister_netdevice(sdata->dev);
Jiri Bencf0706e822007-05-05 11:45:53 -0700775}
776
Johannes Berg75636522008-07-09 14:40:35 +0200777/*
778 * Remove all interfaces, may only be called at hardware unregistration
779 * time because it doesn't do RCU-safe list removals.
780 */
781void ieee80211_remove_interfaces(struct ieee80211_local *local)
Jiri Bencf0706e822007-05-05 11:45:53 -0700782{
Johannes Berg75636522008-07-09 14:40:35 +0200783 struct ieee80211_sub_if_data *sdata, *tmp;
Jiri Bencf0706e822007-05-05 11:45:53 -0700784
785 ASSERT_RTNL();
786
Johannes Berg75636522008-07-09 14:40:35 +0200787 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
788 list_del(&sdata->list);
789 unregister_netdevice(sdata->dev);
Jiri Bencf0706e822007-05-05 11:45:53 -0700790 }
Jiri Bencf0706e822007-05-05 11:45:53 -0700791}