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mac80211: simplify station/aggregation code
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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 */
5a0e3ad6 13#include <linux/slab.h>
f0706e82
JB
14#include <linux/kernel.h>
15#include <linux/if_arp.h>
16#include <linux/netdevice.h>
17#include <linux/rtnetlink.h>
18#include <net/mac80211.h>
cf0277e7 19#include <net/ieee80211_radiotap.h>
f0706e82
JB
20#include "ieee80211_i.h"
21#include "sta_info.h"
e9f207f0 22#include "debugfs_netdev.h"
ee385855 23#include "mesh.h"
0d143fe1 24#include "led.h"
24487981 25#include "driver-ops.h"
cf0277e7 26#include "wme.h"
0d143fe1 27
c771c9d8
JB
28/**
29 * DOC: Interface list locking
30 *
31 * The interface list in each struct ieee80211_local is protected
32 * three-fold:
33 *
34 * (1) modifications may only be done under the RTNL
35 * (2) modifications and readers are protected against each other by
36 * the iflist_mtx.
37 * (3) modifications are done in an RCU manner so atomic readers
38 * can traverse the list in RCU-safe blocks.
39 *
40 * As a consequence, reads (traversals) of the list can be protected
41 * by either the RTNL, the iflist_mtx or RCU.
42 */
43
44
0d143fe1
JB
45static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
46{
47 int meshhdrlen;
48 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
49
50 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
51
52 /* FIX: what would be proper limits for MTU?
53 * This interface uses 802.3 frames. */
54 if (new_mtu < 256 ||
55 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
56 return -EINVAL;
57 }
58
59#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
60 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
61#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
62 dev->mtu = new_mtu;
63 return 0;
64}
65
47846c9b
JB
66static int ieee80211_change_mac(struct net_device *dev, void *addr)
67{
68 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
fc5f7577 69 struct sockaddr *sa = addr;
47846c9b
JB
70 int ret;
71
9607e6b6 72 if (ieee80211_sdata_running(sdata))
47846c9b
JB
73 return -EBUSY;
74
fc5f7577 75 ret = eth_mac_addr(dev, sa);
47846c9b
JB
76
77 if (ret == 0)
fc5f7577 78 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
47846c9b
JB
79
80 return ret;
81}
82
0d143fe1
JB
83static inline int identical_mac_addr_allowed(int type1, int type2)
84{
85 return type1 == NL80211_IFTYPE_MONITOR ||
86 type2 == NL80211_IFTYPE_MONITOR ||
87 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
88 (type1 == NL80211_IFTYPE_WDS &&
89 (type2 == NL80211_IFTYPE_WDS ||
90 type2 == NL80211_IFTYPE_AP)) ||
91 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
92 (type1 == NL80211_IFTYPE_AP_VLAN &&
93 (type2 == NL80211_IFTYPE_AP ||
94 type2 == NL80211_IFTYPE_AP_VLAN));
95}
96
97static int ieee80211_open(struct net_device *dev)
98{
b4a4bf5d
JB
99 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
100 struct ieee80211_sub_if_data *nsdata;
101 struct ieee80211_local *local = sdata->local;
0d143fe1 102 struct sta_info *sta;
0d143fe1
JB
103 u32 changed = 0;
104 int res;
e8975581 105 u32 hw_reconf_flags = 0;
0d143fe1
JB
106 u8 null_addr[ETH_ALEN] = {0};
107
0d143fe1
JB
108 /* fail early if user set an invalid address */
109 if (compare_ether_addr(dev->dev_addr, null_addr) &&
110 !is_valid_ether_addr(dev->dev_addr))
111 return -EADDRNOTAVAIL;
112
113 /* we hold the RTNL here so can safely walk the list */
114 list_for_each_entry(nsdata, &local->interfaces, list) {
115 struct net_device *ndev = nsdata->dev;
116
9607e6b6 117 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
0d143fe1
JB
118 /*
119 * Allow only a single IBSS interface to be up at any
120 * time. This is restricted because beacon distribution
121 * cannot work properly if both are in the same IBSS.
122 *
123 * To remove this restriction we'd have to disallow them
124 * from setting the same SSID on different IBSS interfaces
125 * belonging to the same hardware. Then, however, we're
126 * faced with having to adopt two different TSF timers...
127 */
128 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
129 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
130 return -EBUSY;
131
132 /*
133 * The remaining checks are only performed for interfaces
134 * with the same MAC address.
135 */
136 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
137 continue;
138
139 /*
140 * check whether it may have the same address
141 */
142 if (!identical_mac_addr_allowed(sdata->vif.type,
143 nsdata->vif.type))
144 return -ENOTUNIQ;
145
146 /*
147 * can only add VLANs to enabled APs
148 */
149 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
150 nsdata->vif.type == NL80211_IFTYPE_AP)
151 sdata->bss = &nsdata->u.ap;
152 }
153 }
154
155 switch (sdata->vif.type) {
156 case NL80211_IFTYPE_WDS:
157 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
158 return -ENOLINK;
159 break;
160 case NL80211_IFTYPE_AP_VLAN:
161 if (!sdata->bss)
162 return -ENOLINK;
163 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
164 break;
165 case NL80211_IFTYPE_AP:
166 sdata->bss = &sdata->u.ap;
167 break;
168 case NL80211_IFTYPE_MESH_POINT:
169 if (!ieee80211_vif_is_mesh(&sdata->vif))
170 break;
171 /* mesh ifaces must set allmulti to forward mcast traffic */
172 atomic_inc(&local->iff_allmultis);
173 break;
174 case NL80211_IFTYPE_STATION:
175 case NL80211_IFTYPE_MONITOR:
176 case NL80211_IFTYPE_ADHOC:
177 /* no special treatment */
178 break;
179 case NL80211_IFTYPE_UNSPECIFIED:
180 case __NL80211_IFTYPE_AFTER_LAST:
181 /* cannot happen */
182 WARN_ON(1);
183 break;
184 }
185
186 if (local->open_count == 0) {
24487981 187 res = drv_start(local);
0d143fe1
JB
188 if (res)
189 goto err_del_bss;
e8975581
JB
190 /* we're brought up, everything changes */
191 hw_reconf_flags = ~0;
1f87f7d3 192 ieee80211_led_radio(local, true);
0d143fe1
JB
193 }
194
195 /*
196 * Check all interfaces and copy the hopefully now-present
197 * MAC address to those that have the special null one.
198 */
199 list_for_each_entry(nsdata, &local->interfaces, list) {
200 struct net_device *ndev = nsdata->dev;
201
202 /*
9607e6b6 203 * No need to check running since we do not allow
0d143fe1
JB
204 * it to start up with this invalid address.
205 */
0adc23f5 206 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0) {
0d143fe1
JB
207 memcpy(ndev->dev_addr,
208 local->hw.wiphy->perm_addr,
209 ETH_ALEN);
0adc23f5
JL
210 memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN);
211 }
0d143fe1
JB
212 }
213
0d143fe1
JB
214 /*
215 * Validate the MAC address for this device.
216 */
217 if (!is_valid_ether_addr(dev->dev_addr)) {
24487981
JB
218 if (!local->open_count)
219 drv_stop(local);
0d143fe1
JB
220 return -EADDRNOTAVAIL;
221 }
222
223 switch (sdata->vif.type) {
224 case NL80211_IFTYPE_AP_VLAN:
225 /* no need to tell driver */
226 break;
227 case NL80211_IFTYPE_MONITOR:
228 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
229 local->cooked_mntrs++;
230 break;
231 }
232
233 /* must be before the call to ieee80211_configure_filter */
234 local->monitors++;
e8975581 235 if (local->monitors == 1) {
0869aea0
JB
236 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
237 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
e8975581 238 }
0d143fe1
JB
239
240 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
241 local->fif_fcsfail++;
242 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
243 local->fif_plcpfail++;
e3b90ca2 244 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
0d143fe1 245 local->fif_control++;
e3b90ca2
IP
246 local->fif_pspoll++;
247 }
0d143fe1
JB
248 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
249 local->fif_other_bss++;
250
0d143fe1 251 ieee80211_configure_filter(local);
0d143fe1 252 break;
0d143fe1 253 default:
1ed32e4f 254 res = drv_add_interface(local, &sdata->vif);
0d143fe1
JB
255 if (res)
256 goto err_stop;
257
a3c9aa51
AY
258 if (ieee80211_vif_is_mesh(&sdata->vif)) {
259 local->fif_other_bss++;
a3c9aa51 260 ieee80211_configure_filter(local);
a3c9aa51 261
0d143fe1 262 ieee80211_start_mesh(sdata);
e3b90ca2
IP
263 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
264 local->fif_pspoll++;
265
e3b90ca2 266 ieee80211_configure_filter(local);
a3c9aa51 267 }
e3b90ca2 268
0d143fe1
JB
269 changed |= ieee80211_reset_erp_info(sdata);
270 ieee80211_bss_info_change_notify(sdata, changed);
0d143fe1 271
7986cf95 272 if (sdata->vif.type == NL80211_IFTYPE_STATION)
0d143fe1
JB
273 netif_carrier_off(dev);
274 else
275 netif_carrier_on(dev);
276 }
277
278 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
279 /* Create STA entry for the WDS peer */
280 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
281 GFP_KERNEL);
282 if (!sta) {
283 res = -ENOMEM;
284 goto err_del_interface;
285 }
286
287 /* no locking required since STA is not live yet */
288 sta->flags |= WLAN_STA_AUTHORIZED;
289
290 res = sta_info_insert(sta);
291 if (res) {
292 /* STA has been freed */
293 goto err_del_interface;
294 }
295 }
296
0d143fe1
JB
297 /*
298 * set_multicast_list will be invoked by the networking core
299 * which will check whether any increments here were done in
300 * error and sync them down to the hardware as filter flags.
301 */
302 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
303 atomic_inc(&local->iff_allmultis);
304
305 if (sdata->flags & IEEE80211_SDATA_PROMISC)
306 atomic_inc(&local->iff_promiscs);
307
5cff20e6
JB
308 hw_reconf_flags |= __ieee80211_recalc_idle(local);
309
0d143fe1 310 local->open_count++;
e8975581
JB
311 if (hw_reconf_flags) {
312 ieee80211_hw_config(local, hw_reconf_flags);
0d143fe1
JB
313 /*
314 * set default queue parameters so drivers don't
315 * need to initialise the hardware if the hardware
316 * doesn't start up with sane defaults
317 */
318 ieee80211_set_wmm_default(sdata);
319 }
320
10f644a4 321 ieee80211_recalc_ps(local, -1);
965bedad 322
8a5b33f5 323 netif_tx_start_all_queues(dev);
0d143fe1
JB
324
325 return 0;
326 err_del_interface:
1ed32e4f 327 drv_remove_interface(local, &sdata->vif);
0d143fe1 328 err_stop:
24487981
JB
329 if (!local->open_count)
330 drv_stop(local);
0d143fe1
JB
331 err_del_bss:
332 sdata->bss = NULL;
333 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
334 list_del(&sdata->u.vlan.list);
335 return res;
336}
337
338static int ieee80211_stop(struct net_device *dev)
339{
340 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
341 struct ieee80211_local *local = sdata->local;
5061b0c2
JB
342 unsigned long flags;
343 struct sk_buff *skb, *tmp;
e8975581 344 u32 hw_reconf_flags = 0;
5061b0c2 345 int i;
0d143fe1
JB
346
347 /*
348 * Stop TX on this interface first.
349 */
8a5b33f5 350 netif_tx_stop_all_queues(dev);
0d143fe1 351
af6b6374
JB
352 /*
353 * Purge work for this interface.
354 */
355 ieee80211_work_purge(sdata);
356
0d143fe1
JB
357 /*
358 * Remove all stations associated with this interface.
359 *
360 * This must be done before calling ops->remove_interface()
361 * because otherwise we can later invoke ops->sta_notify()
362 * whenever the STAs are removed, and that invalidates driver
363 * assumptions about always getting a vif pointer that is valid
364 * (because if we remove a STA after ops->remove_interface()
365 * the driver will have removed the vif info already!)
366 *
367 * We could relax this and only unlink the stations from the
368 * hash table and list but keep them on a per-sdata list that
369 * will be inserted back again when the interface is brought
370 * up again, but I don't currently see a use case for that,
371 * except with WDS which gets a STA entry created when it is
372 * brought up.
373 */
374 sta_info_flush(local, sdata);
375
376 /*
377 * Don't count this interface for promisc/allmulti while it
378 * is down. dev_mc_unsync() will invoke set_multicast_list
379 * on the master interface which will sync these down to the
380 * hardware as filter flags.
381 */
382 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
383 atomic_dec(&local->iff_allmultis);
384
385 if (sdata->flags & IEEE80211_SDATA_PROMISC)
386 atomic_dec(&local->iff_promiscs);
387
e3b90ca2
IP
388 if (sdata->vif.type == NL80211_IFTYPE_AP)
389 local->fif_pspoll--;
390
3b8d81e0
JB
391 netif_addr_lock_bh(dev);
392 spin_lock_bh(&local->filter_lock);
22bedad3 393 __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
3b8d81e0
JB
394 spin_unlock_bh(&local->filter_lock);
395 netif_addr_unlock_bh(dev);
396
3ac64bee
JB
397 ieee80211_configure_filter(local);
398
7cbf0ba5
VN
399 del_timer_sync(&local->dynamic_ps_timer);
400 cancel_work_sync(&local->dynamic_ps_enable_work);
0d143fe1
JB
401
402 /* APs need special treatment */
403 if (sdata->vif.type == NL80211_IFTYPE_AP) {
57c9fff3 404 struct ieee80211_sub_if_data *vlan, *tmpsdata;
0d143fe1
JB
405 struct beacon_data *old_beacon = sdata->u.ap.beacon;
406
407 /* remove beacon */
408 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
409 synchronize_rcu();
410 kfree(old_beacon);
411
412 /* down all dependent devices, that is VLANs */
57c9fff3 413 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
0d143fe1
JB
414 u.vlan.list)
415 dev_close(vlan->dev);
416 WARN_ON(!list_empty(&sdata->u.ap.vlans));
417 }
418
419 local->open_count--;
420
421 switch (sdata->vif.type) {
422 case NL80211_IFTYPE_AP_VLAN:
423 list_del(&sdata->u.vlan.list);
424 /* no need to tell driver */
425 break;
426 case NL80211_IFTYPE_MONITOR:
427 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
428 local->cooked_mntrs--;
429 break;
430 }
431
432 local->monitors--;
e8975581 433 if (local->monitors == 0) {
0869aea0
JB
434 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
435 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
e8975581 436 }
0d143fe1
JB
437
438 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
439 local->fif_fcsfail--;
440 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
441 local->fif_plcpfail--;
e3b90ca2
IP
442 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
443 local->fif_pspoll--;
0d143fe1 444 local->fif_control--;
e3b90ca2 445 }
0d143fe1
JB
446 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
447 local->fif_other_bss--;
448
0d143fe1 449 ieee80211_configure_filter(local);
0d143fe1
JB
450 break;
451 case NL80211_IFTYPE_STATION:
46900298
JB
452 del_timer_sync(&sdata->u.mgd.chswitch_timer);
453 del_timer_sync(&sdata->u.mgd.timer);
0e2b6286
JB
454 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
455 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
0d143fe1 456 /*
0e2b6286
JB
457 * If any of the timers fired while we waited for it, it will
458 * have queued its work. Now the work will be running again
0d143fe1
JB
459 * but will not rearm the timer again because it checks
460 * whether the interface is running, which, at this point,
461 * it no longer is.
462 */
46900298
JB
463 cancel_work_sync(&sdata->u.mgd.work);
464 cancel_work_sync(&sdata->u.mgd.chswitch_work);
0e2b6286 465 cancel_work_sync(&sdata->u.mgd.monitor_work);
1e4dcd01 466 cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_work);
04de8381 467
0d143fe1
JB
468 /*
469 * When we get here, the interface is marked down.
470 * Call synchronize_rcu() to wait for the RX path
471 * should it be using the interface and enqueuing
472 * frames at this very time on another CPU.
473 */
474 synchronize_rcu();
46900298 475 skb_queue_purge(&sdata->u.mgd.skb_queue);
46900298
JB
476 /* fall through */
477 case NL80211_IFTYPE_ADHOC:
478 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298
JB
479 del_timer_sync(&sdata->u.ibss.timer);
480 cancel_work_sync(&sdata->u.ibss.work);
481 synchronize_rcu();
482 skb_queue_purge(&sdata->u.ibss.skb_queue);
483 }
0d143fe1
JB
484 /* fall through */
485 case NL80211_IFTYPE_MESH_POINT:
486 if (ieee80211_vif_is_mesh(&sdata->vif)) {
a3c9aa51
AY
487 /* other_bss and allmulti are always set on mesh
488 * ifaces */
489 local->fif_other_bss--;
0d143fe1 490 atomic_dec(&local->iff_allmultis);
a3c9aa51 491
a3c9aa51 492 ieee80211_configure_filter(local);
a3c9aa51 493
0d143fe1
JB
494 ieee80211_stop_mesh(sdata);
495 }
496 /* fall through */
497 default:
15db0b7f
JB
498 if (local->scan_sdata == sdata)
499 ieee80211_scan_cancel(local);
0d143fe1 500
97af7432
BC
501 /*
502 * Disable beaconing for AP and mesh, IBSS can't
503 * still be joined to a network at this point.
504 */
505 if (sdata->vif.type == NL80211_IFTYPE_AP ||
506 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
507 ieee80211_bss_info_change_notify(sdata,
508 BSS_CHANGED_BEACON_ENABLED);
509 }
510
ad0e2b5a
JB
511 /* free all remaining keys, there shouldn't be any */
512 ieee80211_free_keys(sdata);
1ed32e4f 513 drv_remove_interface(local, &sdata->vif);
0d143fe1
JB
514 }
515
516 sdata->bss = NULL;
517
5cff20e6
JB
518 hw_reconf_flags |= __ieee80211_recalc_idle(local);
519
520 ieee80211_recalc_ps(local, -1);
521
0d143fe1 522 if (local->open_count == 0) {
ea77f12f 523 ieee80211_clear_tx_pending(local);
84f6a01c 524 ieee80211_stop_device(local);
0d143fe1 525
e8975581
JB
526 /* no reconfiguring after stop! */
527 hw_reconf_flags = 0;
0d143fe1
JB
528 }
529
e8975581
JB
530 /* do after stop to avoid reconfiguring when we stop anyway */
531 if (hw_reconf_flags)
532 ieee80211_hw_config(local, hw_reconf_flags);
533
5061b0c2
JB
534 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
535 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
536 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
537 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
538 if (info->control.vif == &sdata->vif) {
539 __skb_unlink(skb, &local->pending[i]);
540 dev_kfree_skb_irq(skb);
541 }
542 }
543 }
544 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
545
0d143fe1
JB
546 return 0;
547}
548
549static void ieee80211_set_multicast_list(struct net_device *dev)
550{
0d143fe1 551 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
b4a4bf5d 552 struct ieee80211_local *local = sdata->local;
0d143fe1
JB
553 int allmulti, promisc, sdata_allmulti, sdata_promisc;
554
555 allmulti = !!(dev->flags & IFF_ALLMULTI);
556 promisc = !!(dev->flags & IFF_PROMISC);
557 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
558 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
559
560 if (allmulti != sdata_allmulti) {
561 if (dev->flags & IFF_ALLMULTI)
562 atomic_inc(&local->iff_allmultis);
563 else
564 atomic_dec(&local->iff_allmultis);
565 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
566 }
567
568 if (promisc != sdata_promisc) {
569 if (dev->flags & IFF_PROMISC)
570 atomic_inc(&local->iff_promiscs);
571 else
572 atomic_dec(&local->iff_promiscs);
573 sdata->flags ^= IEEE80211_SDATA_PROMISC;
574 }
3b8d81e0 575 spin_lock_bh(&local->filter_lock);
22bedad3 576 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
3b8d81e0 577 spin_unlock_bh(&local->filter_lock);
3ac64bee 578 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
0d143fe1
JB
579}
580
75636525
JB
581/*
582 * Called when the netdev is removed or, by the code below, before
583 * the interface type changes.
584 */
585static void ieee80211_teardown_sdata(struct net_device *dev)
f0706e82 586{
75636525
JB
587 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
588 struct ieee80211_local *local = sdata->local;
589 struct beacon_data *beacon;
590 struct sk_buff *skb;
591 int flushed;
f0706e82
JB
592 int i;
593
75636525
JB
594 /* free extra data */
595 ieee80211_free_keys(sdata);
596
aee14ceb
JM
597 ieee80211_debugfs_remove_netdev(sdata);
598
f0706e82 599 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
75636525
JB
600 __skb_queue_purge(&sdata->fragments[i].skb_list);
601 sdata->fragment_next = 0;
11a843b7 602
75636525 603 switch (sdata->vif.type) {
05c914fe 604 case NL80211_IFTYPE_AP:
75636525
JB
605 beacon = sdata->u.ap.beacon;
606 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
607 synchronize_rcu();
608 kfree(beacon);
3e122be0 609
75636525
JB
610 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
611 local->total_ps_buffered--;
612 dev_kfree_skb(skb);
613 }
614
615 break;
05c914fe 616 case NL80211_IFTYPE_MESH_POINT:
75636525 617 if (ieee80211_vif_is_mesh(&sdata->vif))
f698d856 618 mesh_rmc_free(sdata);
472dbc45 619 break;
05c914fe 620 case NL80211_IFTYPE_ADHOC:
af8cdcd8
JB
621 if (WARN_ON(sdata->u.ibss.presp))
622 kfree_skb(sdata->u.ibss.presp);
46900298
JB
623 break;
624 case NL80211_IFTYPE_STATION:
05c914fe
JB
625 case NL80211_IFTYPE_WDS:
626 case NL80211_IFTYPE_AP_VLAN:
627 case NL80211_IFTYPE_MONITOR:
75636525 628 break;
05c914fe
JB
629 case NL80211_IFTYPE_UNSPECIFIED:
630 case __NL80211_IFTYPE_AFTER_LAST:
75636525
JB
631 BUG();
632 break;
633 }
634
635 flushed = sta_info_flush(local, sdata);
636 WARN_ON(flushed);
f0706e82
JB
637}
638
cf0277e7
JB
639static u16 ieee80211_netdev_select_queue(struct net_device *dev,
640 struct sk_buff *skb)
641{
642 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
643}
644
587e729e
JB
645static const struct net_device_ops ieee80211_dataif_ops = {
646 .ndo_open = ieee80211_open,
647 .ndo_stop = ieee80211_stop,
648 .ndo_uninit = ieee80211_teardown_sdata,
649 .ndo_start_xmit = ieee80211_subif_start_xmit,
650 .ndo_set_multicast_list = ieee80211_set_multicast_list,
651 .ndo_change_mtu = ieee80211_change_mtu,
47846c9b 652 .ndo_set_mac_address = ieee80211_change_mac,
cf0277e7 653 .ndo_select_queue = ieee80211_netdev_select_queue,
587e729e
JB
654};
655
cf0277e7
JB
656static u16 ieee80211_monitor_select_queue(struct net_device *dev,
657 struct sk_buff *skb)
658{
659 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
660 struct ieee80211_local *local = sdata->local;
661 struct ieee80211_hdr *hdr;
662 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
193e70ef 663 u8 *p;
cf0277e7
JB
664
665 if (local->hw.queues < 4)
666 return 0;
667
668 if (skb->len < 4 ||
b49bb574 669 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
cf0277e7
JB
670 return 0; /* doesn't matter, frame will be dropped */
671
b49bb574 672 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
cf0277e7 673
861a57cd 674 if (!ieee80211_is_data(hdr->frame_control)) {
cf0277e7
JB
675 skb->priority = 7;
676 return ieee802_1d_to_ac[skb->priority];
677 }
861a57cd
FF
678 if (!ieee80211_is_data_qos(hdr->frame_control)) {
679 skb->priority = 0;
680 return ieee802_1d_to_ac[skb->priority];
681 }
cf0277e7 682
193e70ef
FF
683 p = ieee80211_get_qos_ctl(hdr);
684 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
685
cf0277e7
JB
686 return ieee80211_downgrade_queue(local, skb);
687}
688
587e729e
JB
689static const struct net_device_ops ieee80211_monitorif_ops = {
690 .ndo_open = ieee80211_open,
691 .ndo_stop = ieee80211_stop,
692 .ndo_uninit = ieee80211_teardown_sdata,
693 .ndo_start_xmit = ieee80211_monitor_start_xmit,
694 .ndo_set_multicast_list = ieee80211_set_multicast_list,
695 .ndo_change_mtu = ieee80211_change_mtu,
696 .ndo_set_mac_address = eth_mac_addr,
cf0277e7 697 .ndo_select_queue = ieee80211_monitor_select_queue,
587e729e
JB
698};
699
700static void ieee80211_if_setup(struct net_device *dev)
701{
702 ether_setup(dev);
703 dev->netdev_ops = &ieee80211_dataif_ops;
587e729e
JB
704 dev->destructor = free_netdev;
705}
706
75636525
JB
707/*
708 * Helper function to initialise an interface to a specific type.
709 */
710static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
05c914fe 711 enum nl80211_iftype type)
f0706e82 712{
75636525
JB
713 /* clear type-dependent union */
714 memset(&sdata->u, 0, sizeof(sdata->u));
715
716 /* and set some type-dependent values */
717 sdata->vif.type = type;
587e729e 718 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
60719ffd 719 sdata->wdev.iftype = type;
75636525
JB
720
721 /* only monitor differs */
722 sdata->dev->type = ARPHRD_ETHER;
723
724 switch (type) {
05c914fe 725 case NL80211_IFTYPE_AP:
75636525
JB
726 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
727 INIT_LIST_HEAD(&sdata->u.ap.vlans);
728 break;
05c914fe 729 case NL80211_IFTYPE_STATION:
9c6bd790 730 ieee80211_sta_setup_sdata(sdata);
472dbc45 731 break;
46900298
JB
732 case NL80211_IFTYPE_ADHOC:
733 ieee80211_ibss_setup_sdata(sdata);
734 break;
05c914fe 735 case NL80211_IFTYPE_MESH_POINT:
75636525
JB
736 if (ieee80211_vif_is_mesh(&sdata->vif))
737 ieee80211_mesh_init_sdata(sdata);
738 break;
05c914fe 739 case NL80211_IFTYPE_MONITOR:
75636525 740 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
587e729e 741 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
75636525
JB
742 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
743 MONITOR_FLAG_OTHER_BSS;
744 break;
05c914fe
JB
745 case NL80211_IFTYPE_WDS:
746 case NL80211_IFTYPE_AP_VLAN:
75636525 747 break;
05c914fe
JB
748 case NL80211_IFTYPE_UNSPECIFIED:
749 case __NL80211_IFTYPE_AFTER_LAST:
75636525
JB
750 BUG();
751 break;
752 }
753
754 ieee80211_debugfs_add_netdev(sdata);
755}
756
f3947e2d 757int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
05c914fe 758 enum nl80211_iftype type)
75636525 759{
f3947e2d
JB
760 ASSERT_RTNL();
761
762 if (type == sdata->vif.type)
763 return 0;
764
e60c7744 765 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
dcebf45c
PR
766 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
767 type == NL80211_IFTYPE_ADHOC)
e60c7744
JB
768 return -EOPNOTSUPP;
769
f3947e2d
JB
770 /*
771 * We could, here, on changes between IBSS/STA/MESH modes,
772 * invoke an MLME function instead that disassociates etc.
773 * and goes into the requested mode.
774 */
775
9607e6b6 776 if (ieee80211_sdata_running(sdata))
f3947e2d
JB
777 return -EBUSY;
778
75636525
JB
779 /* Purge and reset type-dependent state. */
780 ieee80211_teardown_sdata(sdata->dev);
781 ieee80211_setup_sdata(sdata, type);
782
783 /* reset some values that shouldn't be kept across type changes */
bda3933a 784 sdata->vif.bss_conf.basic_rates =
96dd22ac
JB
785 ieee80211_mandatory_rates(sdata->local,
786 sdata->local->hw.conf.channel->band);
75636525 787 sdata->drop_unencrypted = 0;
9bc383de
JB
788 if (type == NL80211_IFTYPE_STATION)
789 sdata->u.mgd.use_4addr = false;
f3947e2d
JB
790
791 return 0;
f0706e82
JB
792}
793
fa9029f8
JB
794static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
795 struct net_device *dev,
796 enum nl80211_iftype type)
797{
798 struct ieee80211_sub_if_data *sdata;
799 u64 mask, start, addr, val, inc;
800 u8 *m;
801 u8 tmp_addr[ETH_ALEN];
802 int i;
803
804 /* default ... something at least */
805 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
806
807 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
808 local->hw.wiphy->n_addresses <= 1)
809 return;
810
811
812 mutex_lock(&local->iflist_mtx);
813
814 switch (type) {
815 case NL80211_IFTYPE_MONITOR:
816 /* doesn't matter */
817 break;
818 case NL80211_IFTYPE_WDS:
819 case NL80211_IFTYPE_AP_VLAN:
820 /* match up with an AP interface */
821 list_for_each_entry(sdata, &local->interfaces, list) {
822 if (sdata->vif.type != NL80211_IFTYPE_AP)
823 continue;
824 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
825 break;
826 }
827 /* keep default if no AP interface present */
828 break;
829 default:
830 /* assign a new address if possible -- try n_addresses first */
831 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
832 bool used = false;
833
834 list_for_each_entry(sdata, &local->interfaces, list) {
835 if (memcmp(local->hw.wiphy->addresses[i].addr,
836 sdata->vif.addr, ETH_ALEN) == 0) {
837 used = true;
838 break;
839 }
840 }
841
842 if (!used) {
843 memcpy(dev->perm_addr,
844 local->hw.wiphy->addresses[i].addr,
845 ETH_ALEN);
846 break;
847 }
848 }
849
850 /* try mask if available */
851 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
852 break;
853
854 m = local->hw.wiphy->addr_mask;
855 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
856 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
857 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
858
859 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
860 /* not a contiguous mask ... not handled now! */
861 printk(KERN_DEBUG "not contiguous\n");
862 break;
863 }
864
865 m = local->hw.wiphy->perm_addr;
866 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
867 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
868 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
869
870 inc = 1ULL<<__ffs64(mask);
871 val = (start & mask);
872 addr = (start & ~mask) | (val & mask);
873 do {
874 bool used = false;
875
876 tmp_addr[5] = addr >> 0*8;
877 tmp_addr[4] = addr >> 1*8;
878 tmp_addr[3] = addr >> 2*8;
879 tmp_addr[2] = addr >> 3*8;
880 tmp_addr[1] = addr >> 4*8;
881 tmp_addr[0] = addr >> 5*8;
882
883 val += inc;
884
885 list_for_each_entry(sdata, &local->interfaces, list) {
886 if (memcmp(tmp_addr, sdata->vif.addr,
887 ETH_ALEN) == 0) {
888 used = true;
889 break;
890 }
891 }
892
893 if (!used) {
894 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
895 break;
896 }
897 addr = (start & ~mask) | (val & mask);
898 } while (addr != start);
899
900 break;
901 }
902
903 mutex_unlock(&local->iflist_mtx);
904}
905
3e122be0 906int ieee80211_if_add(struct ieee80211_local *local, const char *name,
05c914fe 907 struct net_device **new_dev, enum nl80211_iftype type,
ee385855 908 struct vif_params *params)
f0706e82
JB
909{
910 struct net_device *ndev;
f0706e82 911 struct ieee80211_sub_if_data *sdata = NULL;
75636525 912 int ret, i;
f0706e82
JB
913
914 ASSERT_RTNL();
75636525 915
cf0277e7
JB
916 ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
917 name, ieee80211_if_setup, local->hw.queues);
f0706e82
JB
918 if (!ndev)
919 return -ENOMEM;
a272a720 920 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
f0706e82 921
f3994ece
JB
922 ndev->needed_headroom = local->tx_headroom +
923 4*6 /* four MAC addresses */
924 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
925 + 6 /* mesh */
926 + 8 /* rfc1042/bridge tunnel */
927 - ETH_HLEN /* ethernet hard_header_len */
928 + IEEE80211_ENCRYPT_HEADROOM;
929 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
930
f0706e82
JB
931 ret = dev_alloc_name(ndev, ndev->name);
932 if (ret < 0)
933 goto fail;
934
fa9029f8
JB
935 ieee80211_assign_perm_addr(local, ndev, type);
936 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
f0706e82
JB
937 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
938
3e122be0
JB
939 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
940 sdata = netdev_priv(ndev);
f0706e82 941 ndev->ieee80211_ptr = &sdata->wdev;
47846c9b
JB
942 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
943 memcpy(sdata->name, ndev->name, IFNAMSIZ);
75636525
JB
944
945 /* initialise type-independent data */
f0706e82 946 sdata->wdev.wiphy = local->hw.wiphy;
f0706e82 947 sdata->local = local;
75636525
JB
948 sdata->dev = ndev;
949
950 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
951 skb_queue_head_init(&sdata->fragments[i].skb_list);
952
953 INIT_LIST_HEAD(&sdata->key_list);
954
37eb0b16
JM
955 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
956 struct ieee80211_supported_band *sband;
957 sband = local->hw.wiphy->bands[i];
958 sdata->rc_rateidx_mask[i] =
959 sband ? (1 << sband->n_bitrates) - 1 : 0;
960 }
75636525
JB
961
962 /* setup type-dependent data */
963 ieee80211_setup_sdata(sdata, type);
f0706e82 964
9bc383de
JB
965 if (params) {
966 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
967 if (type == NL80211_IFTYPE_STATION)
968 sdata->u.mgd.use_4addr = params->use_4addr;
969 }
970
f0706e82
JB
971 ret = register_netdevice(ndev);
972 if (ret)
973 goto fail;
974
902acc78
JB
975 if (ieee80211_vif_is_mesh(&sdata->vif) &&
976 params && params->mesh_id_len)
472dbc45
JB
977 ieee80211_sdata_set_mesh_id(sdata,
978 params->mesh_id_len,
979 params->mesh_id);
ee385855 980
c771c9d8 981 mutex_lock(&local->iflist_mtx);
79010420 982 list_add_tail_rcu(&sdata->list, &local->interfaces);
c771c9d8 983 mutex_unlock(&local->iflist_mtx);
79010420 984
f0706e82
JB
985 if (new_dev)
986 *new_dev = ndev;
f0706e82 987
f0706e82
JB
988 return 0;
989
75636525 990 fail:
f0706e82
JB
991 free_netdev(ndev);
992 return ret;
993}
994
f698d856 995void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
f0706e82 996{
f0706e82 997 ASSERT_RTNL();
11a843b7 998
c771c9d8 999 mutex_lock(&sdata->local->iflist_mtx);
75636525 1000 list_del_rcu(&sdata->list);
c771c9d8
JB
1001 mutex_unlock(&sdata->local->iflist_mtx);
1002
75636525 1003 synchronize_rcu();
f698d856 1004 unregister_netdevice(sdata->dev);
f0706e82
JB
1005}
1006
75636525
JB
1007/*
1008 * Remove all interfaces, may only be called at hardware unregistration
1009 * time because it doesn't do RCU-safe list removals.
1010 */
1011void ieee80211_remove_interfaces(struct ieee80211_local *local)
f0706e82 1012{
75636525 1013 struct ieee80211_sub_if_data *sdata, *tmp;
efe117ab 1014 LIST_HEAD(unreg_list);
f0706e82
JB
1015
1016 ASSERT_RTNL();
1017
efe117ab 1018 mutex_lock(&local->iflist_mtx);
75636525
JB
1019 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1020 list_del(&sdata->list);
c771c9d8 1021
efe117ab 1022 unregister_netdevice_queue(sdata->dev, &unreg_list);
f0706e82 1023 }
efe117ab
ED
1024 mutex_unlock(&local->iflist_mtx);
1025 unregister_netdevice_many(&unreg_list);
f0706e82 1026}
5cff20e6
JB
1027
1028static u32 ieee80211_idle_off(struct ieee80211_local *local,
1029 const char *reason)
1030{
1031 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1032 return 0;
1033
1034#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1035 printk(KERN_DEBUG "%s: device no longer idle - %s\n",
1036 wiphy_name(local->hw.wiphy), reason);
1037#endif
1038
1039 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1040 return IEEE80211_CONF_CHANGE_IDLE;
1041}
1042
1043static u32 ieee80211_idle_on(struct ieee80211_local *local)
1044{
1045 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1046 return 0;
1047
1048#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1049 printk(KERN_DEBUG "%s: device now idle\n",
1050 wiphy_name(local->hw.wiphy));
1051#endif
1052
a80f7c0b
JB
1053 drv_flush(local, false);
1054
5cff20e6
JB
1055 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1056 return IEEE80211_CONF_CHANGE_IDLE;
1057}
1058
1059u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1060{
1061 struct ieee80211_sub_if_data *sdata;
1062 int count = 0;
1063
af6b6374
JB
1064 if (!list_empty(&local->work_list))
1065 return ieee80211_idle_off(local, "working");
1066
fbe9c429 1067 if (local->scanning)
5cff20e6
JB
1068 return ieee80211_idle_off(local, "scanning");
1069
1070 list_for_each_entry(sdata, &local->interfaces, list) {
9607e6b6 1071 if (!ieee80211_sdata_running(sdata))
5cff20e6
JB
1072 continue;
1073 /* do not count disabled managed interfaces */
1074 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
af6b6374 1075 !sdata->u.mgd.associated)
5cff20e6
JB
1076 continue;
1077 /* do not count unused IBSS interfaces */
1078 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1079 !sdata->u.ibss.ssid_len)
1080 continue;
1081 /* count everything else */
1082 count++;
1083 }
1084
1085 if (!count)
1086 return ieee80211_idle_on(local);
1087 else
1088 return ieee80211_idle_off(local, "in use");
1089
1090 return 0;
1091}
1092
1093void ieee80211_recalc_idle(struct ieee80211_local *local)
1094{
1095 u32 chg;
1096
1097 mutex_lock(&local->iflist_mtx);
1098 chg = __ieee80211_recalc_idle(local);
1099 mutex_unlock(&local->iflist_mtx);
58905ca5
JB
1100 if (chg)
1101 ieee80211_hw_config(local, chg);
5cff20e6 1102}
47846c9b
JB
1103
1104static int netdev_notify(struct notifier_block *nb,
1105 unsigned long state,
1106 void *ndev)
1107{
1108 struct net_device *dev = ndev;
1109 struct ieee80211_sub_if_data *sdata;
1110
1111 if (state != NETDEV_CHANGENAME)
1112 return 0;
1113
1114 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1115 return 0;
1116
1117 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1118 return 0;
1119
1120 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1121
2f5265e6 1122 memcpy(sdata->name, dev->name, IFNAMSIZ);
47846c9b
JB
1123
1124 ieee80211_debugfs_rename_netdev(sdata);
1125 return 0;
1126}
1127
1128static struct notifier_block mac80211_netdev_notifier = {
1129 .notifier_call = netdev_notify,
1130};
1131
1132int ieee80211_iface_init(void)
1133{
1134 return register_netdevice_notifier(&mac80211_netdev_notifier);
1135}
1136
1137void ieee80211_iface_exit(void)
1138{
1139 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1140}