blob: 915d04323a32b3a9670230aea61192e2a0936573 [file] [log] [blame]
Jiri Bencf0706e82007-05-05 11:45:53 -07001/*
Johannes Berg0d143fe2008-09-11 00:01:59 +02002 * Interface handling (except master interface)
3 *
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -070023
Johannes Bergc771c9d2009-01-23 22:54:03 +010024/**
25 * DOC: Interface list locking
26 *
27 * The interface list in each struct ieee80211_local is protected
28 * three-fold:
29 *
30 * (1) modifications may only be done under the RTNL
31 * (2) modifications and readers are protected against each other by
32 * the iflist_mtx.
33 * (3) modifications are done in an RCU manner so atomic readers
34 * can traverse the list in RCU-safe blocks.
35 *
36 * As a consequence, reads (traversals) of the list can be protected
37 * by either the RTNL, the iflist_mtx or RCU.
38 */
39
40
Johannes Berg0d143fe2008-09-11 00:01:59 +020041static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
42{
43 int meshhdrlen;
44 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
45
46 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
47
48 /* FIX: what would be proper limits for MTU?
49 * This interface uses 802.3 frames. */
50 if (new_mtu < 256 ||
51 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
52 return -EINVAL;
53 }
54
55#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
56 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
57#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
58 dev->mtu = new_mtu;
59 return 0;
60}
61
62static inline int identical_mac_addr_allowed(int type1, int type2)
63{
64 return type1 == NL80211_IFTYPE_MONITOR ||
65 type2 == NL80211_IFTYPE_MONITOR ||
66 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
67 (type1 == NL80211_IFTYPE_WDS &&
68 (type2 == NL80211_IFTYPE_WDS ||
69 type2 == NL80211_IFTYPE_AP)) ||
70 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
71 (type1 == NL80211_IFTYPE_AP_VLAN &&
72 (type2 == NL80211_IFTYPE_AP ||
73 type2 == NL80211_IFTYPE_AP_VLAN));
74}
75
76static int ieee80211_open(struct net_device *dev)
77{
Johannes Bergb4a4bf52008-09-26 13:34:54 +020078 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
79 struct ieee80211_sub_if_data *nsdata;
80 struct ieee80211_local *local = sdata->local;
Johannes Berg0d143fe2008-09-11 00:01:59 +020081 struct sta_info *sta;
82 struct ieee80211_if_init_conf conf;
83 u32 changed = 0;
84 int res;
Johannes Berge8975582008-10-09 12:18:51 +020085 u32 hw_reconf_flags = 0;
Johannes Berg0d143fe2008-09-11 00:01:59 +020086 u8 null_addr[ETH_ALEN] = {0};
87
Johannes Berg0d143fe2008-09-11 00:01:59 +020088 /* fail early if user set an invalid address */
89 if (compare_ether_addr(dev->dev_addr, null_addr) &&
90 !is_valid_ether_addr(dev->dev_addr))
91 return -EADDRNOTAVAIL;
92
93 /* we hold the RTNL here so can safely walk the list */
94 list_for_each_entry(nsdata, &local->interfaces, list) {
95 struct net_device *ndev = nsdata->dev;
96
97 if (ndev != dev && netif_running(ndev)) {
98 /*
99 * Allow only a single IBSS interface to be up at any
100 * time. This is restricted because beacon distribution
101 * cannot work properly if both are in the same IBSS.
102 *
103 * To remove this restriction we'd have to disallow them
104 * from setting the same SSID on different IBSS interfaces
105 * belonging to the same hardware. Then, however, we're
106 * faced with having to adopt two different TSF timers...
107 */
108 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
109 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
110 return -EBUSY;
111
112 /*
113 * The remaining checks are only performed for interfaces
114 * with the same MAC address.
115 */
116 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
117 continue;
118
119 /*
120 * check whether it may have the same address
121 */
122 if (!identical_mac_addr_allowed(sdata->vif.type,
123 nsdata->vif.type))
124 return -ENOTUNIQ;
125
126 /*
127 * can only add VLANs to enabled APs
128 */
129 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
130 nsdata->vif.type == NL80211_IFTYPE_AP)
131 sdata->bss = &nsdata->u.ap;
132 }
133 }
134
135 switch (sdata->vif.type) {
136 case NL80211_IFTYPE_WDS:
137 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
138 return -ENOLINK;
139 break;
140 case NL80211_IFTYPE_AP_VLAN:
141 if (!sdata->bss)
142 return -ENOLINK;
143 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
144 break;
145 case NL80211_IFTYPE_AP:
146 sdata->bss = &sdata->u.ap;
147 break;
148 case NL80211_IFTYPE_MESH_POINT:
149 if (!ieee80211_vif_is_mesh(&sdata->vif))
150 break;
151 /* mesh ifaces must set allmulti to forward mcast traffic */
152 atomic_inc(&local->iff_allmultis);
153 break;
154 case NL80211_IFTYPE_STATION:
155 case NL80211_IFTYPE_MONITOR:
156 case NL80211_IFTYPE_ADHOC:
157 /* no special treatment */
158 break;
159 case NL80211_IFTYPE_UNSPECIFIED:
160 case __NL80211_IFTYPE_AFTER_LAST:
161 /* cannot happen */
162 WARN_ON(1);
163 break;
164 }
165
166 if (local->open_count == 0) {
167 res = 0;
168 if (local->ops->start)
169 res = local->ops->start(local_to_hw(local));
170 if (res)
171 goto err_del_bss;
Johannes Berge8975582008-10-09 12:18:51 +0200172 /* we're brought up, everything changes */
173 hw_reconf_flags = ~0;
Johannes Berg0d143fe2008-09-11 00:01:59 +0200174 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
175 }
176
177 /*
178 * Check all interfaces and copy the hopefully now-present
179 * MAC address to those that have the special null one.
180 */
181 list_for_each_entry(nsdata, &local->interfaces, list) {
182 struct net_device *ndev = nsdata->dev;
183
184 /*
185 * No need to check netif_running since we do not allow
186 * it to start up with this invalid address.
187 */
188 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
189 memcpy(ndev->dev_addr,
190 local->hw.wiphy->perm_addr,
191 ETH_ALEN);
192 }
193
194 if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
195 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
196 ETH_ALEN);
197
198 /*
199 * Validate the MAC address for this device.
200 */
201 if (!is_valid_ether_addr(dev->dev_addr)) {
202 if (!local->open_count && local->ops->stop)
203 local->ops->stop(local_to_hw(local));
204 return -EADDRNOTAVAIL;
205 }
206
207 switch (sdata->vif.type) {
208 case NL80211_IFTYPE_AP_VLAN:
209 /* no need to tell driver */
210 break;
211 case NL80211_IFTYPE_MONITOR:
212 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
213 local->cooked_mntrs++;
214 break;
215 }
216
217 /* must be before the call to ieee80211_configure_filter */
218 local->monitors++;
Johannes Berge8975582008-10-09 12:18:51 +0200219 if (local->monitors == 1) {
Johannes Berg0d143fe2008-09-11 00:01:59 +0200220 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
Johannes Berge8975582008-10-09 12:18:51 +0200221 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
222 }
Johannes Berg0d143fe2008-09-11 00:01:59 +0200223
224 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
225 local->fif_fcsfail++;
226 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
227 local->fif_plcpfail++;
228 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
229 local->fif_control++;
230 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
231 local->fif_other_bss++;
232
233 netif_addr_lock_bh(local->mdev);
234 ieee80211_configure_filter(local);
235 netif_addr_unlock_bh(local->mdev);
236 break;
237 case NL80211_IFTYPE_STATION:
238 case NL80211_IFTYPE_ADHOC:
239 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
240 /* fall through */
241 default:
242 conf.vif = &sdata->vif;
243 conf.type = sdata->vif.type;
244 conf.mac_addr = dev->dev_addr;
245 res = local->ops->add_interface(local_to_hw(local), &conf);
246 if (res)
247 goto err_stop;
248
Andrey Yurovskya3c9aa52008-10-31 14:50:12 -0700249 if (ieee80211_vif_is_mesh(&sdata->vif)) {
250 local->fif_other_bss++;
251 netif_addr_lock_bh(local->mdev);
252 ieee80211_configure_filter(local);
253 netif_addr_unlock_bh(local->mdev);
254
Johannes Berg0d143fe2008-09-11 00:01:59 +0200255 ieee80211_start_mesh(sdata);
Andrey Yurovskya3c9aa52008-10-31 14:50:12 -0700256 }
Johannes Berg0d143fe2008-09-11 00:01:59 +0200257 changed |= ieee80211_reset_erp_info(sdata);
258 ieee80211_bss_info_change_notify(sdata, changed);
259 ieee80211_enable_keys(sdata);
260
261 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
262 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
263 netif_carrier_off(dev);
264 else
265 netif_carrier_on(dev);
266 }
267
268 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
269 /* Create STA entry for the WDS peer */
270 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
271 GFP_KERNEL);
272 if (!sta) {
273 res = -ENOMEM;
274 goto err_del_interface;
275 }
276
277 /* no locking required since STA is not live yet */
278 sta->flags |= WLAN_STA_AUTHORIZED;
279
280 res = sta_info_insert(sta);
281 if (res) {
282 /* STA has been freed */
283 goto err_del_interface;
284 }
285 }
286
287 if (local->open_count == 0) {
288 res = dev_open(local->mdev);
289 WARN_ON(res);
290 if (res)
291 goto err_del_interface;
292 tasklet_enable(&local->tx_pending_tasklet);
293 tasklet_enable(&local->tasklet);
294 }
295
296 /*
297 * set_multicast_list will be invoked by the networking core
298 * which will check whether any increments here were done in
299 * error and sync them down to the hardware as filter flags.
300 */
301 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
302 atomic_inc(&local->iff_allmultis);
303
304 if (sdata->flags & IEEE80211_SDATA_PROMISC)
305 atomic_inc(&local->iff_promiscs);
306
307 local->open_count++;
Johannes Berge8975582008-10-09 12:18:51 +0200308 if (hw_reconf_flags) {
309 ieee80211_hw_config(local, hw_reconf_flags);
Johannes Berg0d143fe2008-09-11 00:01:59 +0200310 /*
311 * set default queue parameters so drivers don't
312 * need to initialise the hardware if the hardware
313 * doesn't start up with sane defaults
314 */
315 ieee80211_set_wmm_default(sdata);
316 }
317
318 /*
319 * ieee80211_sta_work is disabled while network interface
320 * is down. Therefore, some configuration changes may not
321 * yet be effective. Trigger execution of ieee80211_sta_work
322 * to fix this.
323 */
324 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
325 sdata->vif.type == NL80211_IFTYPE_ADHOC) {
326 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
327 queue_work(local->hw.workqueue, &ifsta->work);
328 }
329
330 netif_tx_start_all_queues(dev);
331
332 return 0;
333 err_del_interface:
334 local->ops->remove_interface(local_to_hw(local), &conf);
335 err_stop:
336 if (!local->open_count && local->ops->stop)
337 local->ops->stop(local_to_hw(local));
338 err_del_bss:
339 sdata->bss = NULL;
340 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
341 list_del(&sdata->u.vlan.list);
342 return res;
343}
344
345static int ieee80211_stop(struct net_device *dev)
346{
347 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
348 struct ieee80211_local *local = sdata->local;
349 struct ieee80211_if_init_conf conf;
350 struct sta_info *sta;
Johannes Berge8975582008-10-09 12:18:51 +0200351 u32 hw_reconf_flags = 0;
Johannes Berg0d143fe2008-09-11 00:01:59 +0200352
353 /*
354 * Stop TX on this interface first.
355 */
356 netif_tx_stop_all_queues(dev);
357
358 /*
359 * Now delete all active aggregation sessions.
360 */
361 rcu_read_lock();
362
363 list_for_each_entry_rcu(sta, &local->sta_list, list) {
364 if (sta->sdata == sdata)
Johannes Berg17741cd2008-09-11 00:02:02 +0200365 ieee80211_sta_tear_down_BA_sessions(sdata,
366 sta->sta.addr);
Johannes Berg0d143fe2008-09-11 00:01:59 +0200367 }
368
369 rcu_read_unlock();
370
371 /*
372 * Remove all stations associated with this interface.
373 *
374 * This must be done before calling ops->remove_interface()
375 * because otherwise we can later invoke ops->sta_notify()
376 * whenever the STAs are removed, and that invalidates driver
377 * assumptions about always getting a vif pointer that is valid
378 * (because if we remove a STA after ops->remove_interface()
379 * the driver will have removed the vif info already!)
380 *
381 * We could relax this and only unlink the stations from the
382 * hash table and list but keep them on a per-sdata list that
383 * will be inserted back again when the interface is brought
384 * up again, but I don't currently see a use case for that,
385 * except with WDS which gets a STA entry created when it is
386 * brought up.
387 */
388 sta_info_flush(local, sdata);
389
390 /*
391 * Don't count this interface for promisc/allmulti while it
392 * is down. dev_mc_unsync() will invoke set_multicast_list
393 * on the master interface which will sync these down to the
394 * hardware as filter flags.
395 */
396 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
397 atomic_dec(&local->iff_allmultis);
398
399 if (sdata->flags & IEEE80211_SDATA_PROMISC)
400 atomic_dec(&local->iff_promiscs);
401
402 dev_mc_unsync(local->mdev, dev);
Vivek Natarajan7cbf0ba2008-12-24 00:34:37 -0800403 del_timer_sync(&local->dynamic_ps_timer);
404 cancel_work_sync(&local->dynamic_ps_enable_work);
Johannes Berg0d143fe2008-09-11 00:01:59 +0200405
406 /* APs need special treatment */
407 if (sdata->vif.type == NL80211_IFTYPE_AP) {
408 struct ieee80211_sub_if_data *vlan, *tmp;
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 */
417 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
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--;
Johannes Berge8975582008-10-09 12:18:51 +0200437 if (local->monitors == 0) {
Johannes Berg0d143fe2008-09-11 00:01:59 +0200438 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
Johannes Berge8975582008-10-09 12:18:51 +0200439 hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
440 }
Johannes Berg0d143fe2008-09-11 00:01:59 +0200441
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--;
446 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
447 local->fif_control--;
448 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
449 local->fif_other_bss--;
450
451 netif_addr_lock_bh(local->mdev);
452 ieee80211_configure_filter(local);
453 netif_addr_unlock_bh(local->mdev);
454 break;
455 case NL80211_IFTYPE_STATION:
456 case NL80211_IFTYPE_ADHOC:
John W. Linvillee327b8472008-12-01 14:56:41 -0500457 /* Announce that we are leaving the network. */
458 if (sdata->u.sta.state != IEEE80211_STA_MLME_DISABLED)
459 ieee80211_sta_deauthenticate(sdata,
460 WLAN_REASON_DEAUTH_LEAVING);
461
Johannes Berg0d143fe2008-09-11 00:01:59 +0200462 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
Sujithc481ec92009-01-06 09:28:37 +0530463 del_timer_sync(&sdata->u.sta.chswitch_timer);
Johannes Berg0d143fe2008-09-11 00:01:59 +0200464 del_timer_sync(&sdata->u.sta.timer);
465 /*
466 * If the timer fired while we waited for it, it will have
467 * requeued the work. Now the work will be running again
468 * but will not rearm the timer again because it checks
469 * whether the interface is running, which, at this point,
470 * it no longer is.
471 */
472 cancel_work_sync(&sdata->u.sta.work);
Sujithc481ec92009-01-06 09:28:37 +0530473 cancel_work_sync(&sdata->u.sta.chswitch_work);
Johannes Berg0d143fe2008-09-11 00:01:59 +0200474 /*
475 * When we get here, the interface is marked down.
476 * Call synchronize_rcu() to wait for the RX path
477 * should it be using the interface and enqueuing
478 * frames at this very time on another CPU.
479 */
480 synchronize_rcu();
481 skb_queue_purge(&sdata->u.sta.skb_queue);
482
Vasanthakumar Thiagarajaneb469362008-12-23 21:30:50 +0530483 sdata->u.sta.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
484 IEEE80211_STA_TKIP_WEP_USED);
Johannes Berg0d143fe2008-09-11 00:01:59 +0200485 kfree(sdata->u.sta.extra_ie);
486 sdata->u.sta.extra_ie = NULL;
487 sdata->u.sta.extra_ie_len = 0;
488 /* fall through */
489 case NL80211_IFTYPE_MESH_POINT:
490 if (ieee80211_vif_is_mesh(&sdata->vif)) {
Andrey Yurovskya3c9aa52008-10-31 14:50:12 -0700491 /* other_bss and allmulti are always set on mesh
492 * ifaces */
493 local->fif_other_bss--;
Johannes Berg0d143fe2008-09-11 00:01:59 +0200494 atomic_dec(&local->iff_allmultis);
Andrey Yurovskya3c9aa52008-10-31 14:50:12 -0700495
496 netif_addr_lock_bh(local->mdev);
497 ieee80211_configure_filter(local);
498 netif_addr_unlock_bh(local->mdev);
499
Johannes Berg0d143fe2008-09-11 00:01:59 +0200500 ieee80211_stop_mesh(sdata);
501 }
502 /* fall through */
503 default:
504 if (local->scan_sdata == sdata) {
505 if (!local->ops->hw_scan)
506 cancel_delayed_work_sync(&local->scan_work);
507 /*
508 * The software scan can no longer run now, so we can
509 * clear out the scan_sdata reference. However, the
510 * hardware scan may still be running. The complete
511 * function must be prepared to handle a NULL value.
512 */
513 local->scan_sdata = NULL;
514 /*
515 * The memory barrier guarantees that another CPU
516 * that is hardware-scanning will now see the fact
517 * that this interface is gone.
518 */
519 smp_mb();
520 /*
521 * If software scanning, complete the scan but since
522 * the scan_sdata is NULL already don't send out a
523 * scan event to userspace -- the scan is incomplete.
524 */
525 if (local->sw_scanning)
526 ieee80211_scan_completed(&local->hw);
527 }
528
529 conf.vif = &sdata->vif;
530 conf.type = sdata->vif.type;
531 conf.mac_addr = dev->dev_addr;
532 /* disable all keys for as long as this netdev is down */
533 ieee80211_disable_keys(sdata);
534 local->ops->remove_interface(local_to_hw(local), &conf);
535 }
536
537 sdata->bss = NULL;
538
539 if (local->open_count == 0) {
540 if (netif_running(local->mdev))
541 dev_close(local->mdev);
542
543 if (local->ops->stop)
544 local->ops->stop(local_to_hw(local));
545
546 ieee80211_led_radio(local, 0);
547
548 flush_workqueue(local->hw.workqueue);
549
550 tasklet_disable(&local->tx_pending_tasklet);
551 tasklet_disable(&local->tasklet);
Johannes Berge8975582008-10-09 12:18:51 +0200552
553 /* no reconfiguring after stop! */
554 hw_reconf_flags = 0;
Johannes Berg0d143fe2008-09-11 00:01:59 +0200555 }
556
Johannes Berge8975582008-10-09 12:18:51 +0200557 /* do after stop to avoid reconfiguring when we stop anyway */
558 if (hw_reconf_flags)
559 ieee80211_hw_config(local, hw_reconf_flags);
560
Johannes Berg0d143fe2008-09-11 00:01:59 +0200561 return 0;
562}
563
564static void ieee80211_set_multicast_list(struct net_device *dev)
565{
Johannes Berg0d143fe2008-09-11 00:01:59 +0200566 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Bergb4a4bf52008-09-26 13:34:54 +0200567 struct ieee80211_local *local = sdata->local;
Johannes Berg0d143fe2008-09-11 00:01:59 +0200568 int allmulti, promisc, sdata_allmulti, sdata_promisc;
569
570 allmulti = !!(dev->flags & IFF_ALLMULTI);
571 promisc = !!(dev->flags & IFF_PROMISC);
572 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
573 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
574
575 if (allmulti != sdata_allmulti) {
576 if (dev->flags & IFF_ALLMULTI)
577 atomic_inc(&local->iff_allmultis);
578 else
579 atomic_dec(&local->iff_allmultis);
580 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
581 }
582
583 if (promisc != sdata_promisc) {
584 if (dev->flags & IFF_PROMISC)
585 atomic_inc(&local->iff_promiscs);
586 else
587 atomic_dec(&local->iff_promiscs);
588 sdata->flags ^= IEEE80211_SDATA_PROMISC;
589 }
590
591 dev_mc_sync(local->mdev, dev);
592}
593
Johannes Berg75636522008-07-09 14:40:35 +0200594/*
595 * Called when the netdev is removed or, by the code below, before
596 * the interface type changes.
597 */
598static void ieee80211_teardown_sdata(struct net_device *dev)
Jiri Bencf0706e82007-05-05 11:45:53 -0700599{
Johannes Berg75636522008-07-09 14:40:35 +0200600 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
601 struct ieee80211_local *local = sdata->local;
602 struct beacon_data *beacon;
603 struct sk_buff *skb;
604 int flushed;
Jiri Bencf0706e82007-05-05 11:45:53 -0700605 int i;
606
Johannes Berg75636522008-07-09 14:40:35 +0200607 /* free extra data */
608 ieee80211_free_keys(sdata);
Jiri Bencf0706e82007-05-05 11:45:53 -0700609
Jouni Malinenaee14ce2008-09-09 16:33:15 +0200610 ieee80211_debugfs_remove_netdev(sdata);
611
Johannes Berg988c0f72008-04-17 19:21:22 +0200612 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
Jiri Bencf0706e82007-05-05 11:45:53 -0700613 __skb_queue_purge(&sdata->fragments[i].skb_list);
Johannes Berg75636522008-07-09 14:40:35 +0200614 sdata->fragment_next = 0;
615
616 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200617 case NL80211_IFTYPE_AP:
Johannes Berg75636522008-07-09 14:40:35 +0200618 beacon = sdata->u.ap.beacon;
619 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
620 synchronize_rcu();
621 kfree(beacon);
622
623 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
624 local->total_ps_buffered--;
625 dev_kfree_skb(skb);
626 }
627
628 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200629 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg75636522008-07-09 14:40:35 +0200630 if (ieee80211_vif_is_mesh(&sdata->vif))
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200631 mesh_rmc_free(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200632 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200633 case NL80211_IFTYPE_STATION:
634 case NL80211_IFTYPE_ADHOC:
Johannes Berg75636522008-07-09 14:40:35 +0200635 kfree(sdata->u.sta.extra_ie);
636 kfree(sdata->u.sta.assocreq_ies);
637 kfree(sdata->u.sta.assocresp_ies);
638 kfree_skb(sdata->u.sta.probe_resp);
Jouni Malinen9aed3cc2009-01-13 16:03:29 +0200639 kfree(sdata->u.sta.ie_probereq);
640 kfree(sdata->u.sta.ie_proberesp);
641 kfree(sdata->u.sta.ie_auth);
642 kfree(sdata->u.sta.ie_assocreq);
643 kfree(sdata->u.sta.ie_reassocreq);
644 kfree(sdata->u.sta.ie_deauth);
645 kfree(sdata->u.sta.ie_disassoc);
Johannes Berg75636522008-07-09 14:40:35 +0200646 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200647 case NL80211_IFTYPE_WDS:
648 case NL80211_IFTYPE_AP_VLAN:
649 case NL80211_IFTYPE_MONITOR:
Johannes Berg75636522008-07-09 14:40:35 +0200650 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200651 case NL80211_IFTYPE_UNSPECIFIED:
652 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Berg75636522008-07-09 14:40:35 +0200653 BUG();
654 break;
655 }
656
657 flushed = sta_info_flush(local, sdata);
658 WARN_ON(flushed);
Jiri Bencf0706e82007-05-05 11:45:53 -0700659}
660
Johannes Berg587e7292009-01-30 13:35:22 +0100661static const struct net_device_ops ieee80211_dataif_ops = {
662 .ndo_open = ieee80211_open,
663 .ndo_stop = ieee80211_stop,
664 .ndo_uninit = ieee80211_teardown_sdata,
665 .ndo_start_xmit = ieee80211_subif_start_xmit,
666 .ndo_set_multicast_list = ieee80211_set_multicast_list,
667 .ndo_change_mtu = ieee80211_change_mtu,
668 .ndo_set_mac_address = eth_mac_addr,
669};
670
671static const struct net_device_ops ieee80211_monitorif_ops = {
672 .ndo_open = ieee80211_open,
673 .ndo_stop = ieee80211_stop,
674 .ndo_uninit = ieee80211_teardown_sdata,
675 .ndo_start_xmit = ieee80211_monitor_start_xmit,
676 .ndo_set_multicast_list = ieee80211_set_multicast_list,
677 .ndo_change_mtu = ieee80211_change_mtu,
678 .ndo_set_mac_address = eth_mac_addr,
679};
680
681static void ieee80211_if_setup(struct net_device *dev)
682{
683 ether_setup(dev);
684 dev->netdev_ops = &ieee80211_dataif_ops;
685 dev->wireless_handlers = &ieee80211_iw_handler_def;
686 dev->destructor = free_netdev;
687}
688
Johannes Berg75636522008-07-09 14:40:35 +0200689/*
690 * Helper function to initialise an interface to a specific type.
691 */
692static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
Johannes Berg05c914f2008-09-11 00:01:58 +0200693 enum nl80211_iftype type)
Johannes Berg75636522008-07-09 14:40:35 +0200694{
Johannes Berg75636522008-07-09 14:40:35 +0200695 /* clear type-dependent union */
696 memset(&sdata->u, 0, sizeof(sdata->u));
697
698 /* and set some type-dependent values */
699 sdata->vif.type = type;
Johannes Berg587e7292009-01-30 13:35:22 +0100700 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
Johannes Berg60719ff2008-09-16 14:55:09 +0200701 sdata->wdev.iftype = type;
Johannes Berg75636522008-07-09 14:40:35 +0200702
703 /* only monitor differs */
704 sdata->dev->type = ARPHRD_ETHER;
705
706 switch (type) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200707 case NL80211_IFTYPE_AP:
Johannes Berg75636522008-07-09 14:40:35 +0200708 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
709 INIT_LIST_HEAD(&sdata->u.ap.vlans);
710 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200711 case NL80211_IFTYPE_STATION:
712 case NL80211_IFTYPE_ADHOC:
Johannes Berg9c6bd792008-09-11 00:01:52 +0200713 ieee80211_sta_setup_sdata(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200714 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200715 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg75636522008-07-09 14:40:35 +0200716 if (ieee80211_vif_is_mesh(&sdata->vif))
717 ieee80211_mesh_init_sdata(sdata);
718 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200719 case NL80211_IFTYPE_MONITOR:
Johannes Berg75636522008-07-09 14:40:35 +0200720 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
Johannes Berg587e7292009-01-30 13:35:22 +0100721 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
Johannes Berg75636522008-07-09 14:40:35 +0200722 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
723 MONITOR_FLAG_OTHER_BSS;
724 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200725 case NL80211_IFTYPE_WDS:
726 case NL80211_IFTYPE_AP_VLAN:
Johannes Berg75636522008-07-09 14:40:35 +0200727 break;
Johannes Berg05c914f2008-09-11 00:01:58 +0200728 case NL80211_IFTYPE_UNSPECIFIED:
729 case __NL80211_IFTYPE_AFTER_LAST:
Johannes Berg75636522008-07-09 14:40:35 +0200730 BUG();
731 break;
732 }
733
734 ieee80211_debugfs_add_netdev(sdata);
735}
736
Johannes Bergf3947e22008-07-09 14:40:36 +0200737int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
Johannes Berg05c914f2008-09-11 00:01:58 +0200738 enum nl80211_iftype type)
Johannes Berg75636522008-07-09 14:40:35 +0200739{
Johannes Bergf3947e22008-07-09 14:40:36 +0200740 ASSERT_RTNL();
741
742 if (type == sdata->vif.type)
743 return 0;
744
Johannes Berge60c7742008-11-26 23:31:40 +0100745 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
Pavel Roskindcebf452008-12-22 16:39:36 -0500746 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
747 type == NL80211_IFTYPE_ADHOC)
Johannes Berge60c7742008-11-26 23:31:40 +0100748 return -EOPNOTSUPP;
749
Johannes Bergf3947e22008-07-09 14:40:36 +0200750 /*
751 * We could, here, on changes between IBSS/STA/MESH modes,
752 * invoke an MLME function instead that disassociates etc.
753 * and goes into the requested mode.
754 */
755
756 if (netif_running(sdata->dev))
757 return -EBUSY;
758
Johannes Berg75636522008-07-09 14:40:35 +0200759 /* Purge and reset type-dependent state. */
760 ieee80211_teardown_sdata(sdata->dev);
761 ieee80211_setup_sdata(sdata, type);
762
763 /* reset some values that shouldn't be kept across type changes */
Johannes Bergbda39332008-10-11 01:51:51 +0200764 sdata->vif.bss_conf.basic_rates =
Johannes Berg96dd22a2008-09-11 00:01:57 +0200765 ieee80211_mandatory_rates(sdata->local,
766 sdata->local->hw.conf.channel->band);
Johannes Berg75636522008-07-09 14:40:35 +0200767 sdata->drop_unencrypted = 0;
Johannes Bergf3947e22008-07-09 14:40:36 +0200768
769 return 0;
Johannes Berg75636522008-07-09 14:40:35 +0200770}
771
Johannes Berg3e122be2008-07-09 14:40:34 +0200772int ieee80211_if_add(struct ieee80211_local *local, const char *name,
Johannes Berg05c914f2008-09-11 00:01:58 +0200773 struct net_device **new_dev, enum nl80211_iftype type,
Luis Carlos Coboee385852008-02-23 15:17:11 +0100774 struct vif_params *params)
Jiri Bencf0706e82007-05-05 11:45:53 -0700775{
776 struct net_device *ndev;
Jiri Bencf0706e82007-05-05 11:45:53 -0700777 struct ieee80211_sub_if_data *sdata = NULL;
Johannes Berg75636522008-07-09 14:40:35 +0200778 int ret, i;
Jiri Bencf0706e82007-05-05 11:45:53 -0700779
780 ASSERT_RTNL();
Johannes Berg75636522008-07-09 14:40:35 +0200781
Johannes Berg32bfd352007-12-19 01:31:26 +0100782 ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
Jiri Bencf0706e82007-05-05 11:45:53 -0700783 name, ieee80211_if_setup);
784 if (!ndev)
785 return -ENOMEM;
786
Johannes Bergf3994ec2008-05-12 20:51:44 -0700787 ndev->needed_headroom = local->tx_headroom +
788 4*6 /* four MAC addresses */
789 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
790 + 6 /* mesh */
791 + 8 /* rfc1042/bridge tunnel */
792 - ETH_HLEN /* ethernet hard_header_len */
793 + IEEE80211_ENCRYPT_HEADROOM;
794 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
795
Jiri Bencf0706e82007-05-05 11:45:53 -0700796 ret = dev_alloc_name(ndev, ndev->name);
797 if (ret < 0)
798 goto fail;
799
800 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700801 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
802
Johannes Berg3e122be2008-07-09 14:40:34 +0200803 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
804 sdata = netdev_priv(ndev);
Jiri Bencf0706e82007-05-05 11:45:53 -0700805 ndev->ieee80211_ptr = &sdata->wdev;
Johannes Berg75636522008-07-09 14:40:35 +0200806
807 /* initialise type-independent data */
Jiri Bencf0706e82007-05-05 11:45:53 -0700808 sdata->wdev.wiphy = local->hw.wiphy;
Jiri Bencf0706e82007-05-05 11:45:53 -0700809 sdata->local = local;
Johannes Berg75636522008-07-09 14:40:35 +0200810 sdata->dev = ndev;
811
812 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
813 skb_queue_head_init(&sdata->fragments[i].skb_list);
814
815 INIT_LIST_HEAD(&sdata->key_list);
816
817 sdata->force_unicast_rateidx = -1;
818 sdata->max_ratectrl_rateidx = -1;
819
820 /* setup type-dependent data */
821 ieee80211_setup_sdata(sdata, type);
Jiri Bencf0706e82007-05-05 11:45:53 -0700822
823 ret = register_netdevice(ndev);
824 if (ret)
825 goto fail;
826
Johannes Berg902acc72008-02-23 15:17:19 +0100827 if (ieee80211_vif_is_mesh(&sdata->vif) &&
828 params && params->mesh_id_len)
Johannes Berg472dbc42008-09-11 00:01:49 +0200829 ieee80211_sdata_set_mesh_id(sdata,
830 params->mesh_id_len,
831 params->mesh_id);
Luis Carlos Coboee385852008-02-23 15:17:11 +0100832
Johannes Bergc771c9d2009-01-23 22:54:03 +0100833 mutex_lock(&local->iflist_mtx);
Johannes Berg79010422007-09-18 17:29:21 -0400834 list_add_tail_rcu(&sdata->list, &local->interfaces);
Johannes Bergc771c9d2009-01-23 22:54:03 +0100835 mutex_unlock(&local->iflist_mtx);
Johannes Berg79010422007-09-18 17:29:21 -0400836
Jiri Bencf0706e82007-05-05 11:45:53 -0700837 if (new_dev)
838 *new_dev = ndev;
Jiri Bencf0706e82007-05-05 11:45:53 -0700839
Jiri Bencf0706e82007-05-05 11:45:53 -0700840 return 0;
841
Johannes Berg75636522008-07-09 14:40:35 +0200842 fail:
Jiri Bencf0706e82007-05-05 11:45:53 -0700843 free_netdev(ndev);
844 return ret;
845}
846
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200847void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e82007-05-05 11:45:53 -0700848{
Jiri Bencf0706e82007-05-05 11:45:53 -0700849 ASSERT_RTNL();
Johannes Berg11a843b2007-08-28 17:01:55 -0400850
Johannes Bergc771c9d2009-01-23 22:54:03 +0100851 mutex_lock(&sdata->local->iflist_mtx);
Johannes Berg75636522008-07-09 14:40:35 +0200852 list_del_rcu(&sdata->list);
Johannes Bergc771c9d2009-01-23 22:54:03 +0100853 mutex_unlock(&sdata->local->iflist_mtx);
854
Johannes Berg75636522008-07-09 14:40:35 +0200855 synchronize_rcu();
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200856 unregister_netdevice(sdata->dev);
Jiri Bencf0706e82007-05-05 11:45:53 -0700857}
858
Johannes Berg75636522008-07-09 14:40:35 +0200859/*
860 * Remove all interfaces, may only be called at hardware unregistration
861 * time because it doesn't do RCU-safe list removals.
862 */
863void ieee80211_remove_interfaces(struct ieee80211_local *local)
Jiri Bencf0706e82007-05-05 11:45:53 -0700864{
Johannes Berg75636522008-07-09 14:40:35 +0200865 struct ieee80211_sub_if_data *sdata, *tmp;
Jiri Bencf0706e82007-05-05 11:45:53 -0700866
867 ASSERT_RTNL();
868
Johannes Berg75636522008-07-09 14:40:35 +0200869 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
Johannes Bergc771c9d2009-01-23 22:54:03 +0100870 /*
871 * we cannot hold the iflist_mtx across unregister_netdevice,
872 * but we only need to hold it for list modifications to lock
873 * out readers since we're under the RTNL here as all other
874 * writers.
875 */
876 mutex_lock(&local->iflist_mtx);
Johannes Berg75636522008-07-09 14:40:35 +0200877 list_del(&sdata->list);
Johannes Bergc771c9d2009-01-23 22:54:03 +0100878 mutex_unlock(&local->iflist_mtx);
879
Johannes Berg75636522008-07-09 14:40:35 +0200880 unregister_netdevice(sdata->dev);
Jiri Bencf0706e82007-05-05 11:45:53 -0700881 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700882}