1 /*
2 * Interface handling (except master interface)
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
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>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45
ieee80211_change_mtu(struct net_device * dev,int new_mtu)46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
47 {
48 int meshhdrlen;
49 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
50
51 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
52
53 /* FIX: what would be proper limits for MTU?
54 * This interface uses 802.3 frames. */
55 if (new_mtu < 256 ||
56 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
57 return -EINVAL;
58 }
59
60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
61 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
63 dev->mtu = new_mtu;
64 return 0;
65 }
66
ieee80211_change_mac(struct net_device * dev,void * addr)67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
68 {
69 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
70 struct sockaddr *sa = addr;
71 int ret;
72
73 if (ieee80211_sdata_running(sdata))
74 return -EBUSY;
75
76 ret = eth_mac_addr(dev, sa);
77
78 if (ret == 0)
79 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
80
81 return ret;
82 }
83
identical_mac_addr_allowed(int type1,int type2)84 static inline int identical_mac_addr_allowed(int type1, int type2)
85 {
86 return type1 == NL80211_IFTYPE_MONITOR ||
87 type2 == NL80211_IFTYPE_MONITOR ||
88 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
89 (type1 == NL80211_IFTYPE_WDS &&
90 (type2 == NL80211_IFTYPE_WDS ||
91 type2 == NL80211_IFTYPE_AP)) ||
92 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
93 (type1 == NL80211_IFTYPE_AP_VLAN &&
94 (type2 == NL80211_IFTYPE_AP ||
95 type2 == NL80211_IFTYPE_AP_VLAN));
96 }
97
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
99 enum nl80211_iftype iftype)
100 {
101 struct ieee80211_local *local = sdata->local;
102 struct ieee80211_sub_if_data *nsdata;
103 struct net_device *dev = sdata->dev;
104
105 ASSERT_RTNL();
106
107 /* we hold the RTNL here so can safely walk the list */
108 list_for_each_entry(nsdata, &local->interfaces, list) {
109 struct net_device *ndev = nsdata->dev;
110
111 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
112 /*
113 * Allow only a single IBSS interface to be up at any
114 * time. This is restricted because beacon distribution
115 * cannot work properly if both are in the same IBSS.
116 *
117 * To remove this restriction we'd have to disallow them
118 * from setting the same SSID on different IBSS interfaces
119 * belonging to the same hardware. Then, however, we're
120 * faced with having to adopt two different TSF timers...
121 */
122 if (iftype == NL80211_IFTYPE_ADHOC &&
123 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
124 return -EBUSY;
125
126 /*
127 * The remaining checks are only performed for interfaces
128 * with the same MAC address.
129 */
130 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
131 continue;
132
133 /*
134 * check whether it may have the same address
135 */
136 if (!identical_mac_addr_allowed(iftype,
137 nsdata->vif.type))
138 return -ENOTUNIQ;
139
140 /*
141 * can only add VLANs to enabled APs
142 */
143 if (iftype == NL80211_IFTYPE_AP_VLAN &&
144 nsdata->vif.type == NL80211_IFTYPE_AP)
145 sdata->bss = &nsdata->u.ap;
146 }
147 }
148
149 return 0;
150 }
151
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)152 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
153 const int offset)
154 {
155 struct ieee80211_local *local = sdata->local;
156 u32 flags = sdata->u.mntr_flags;
157
158 #define ADJUST(_f, _s) do { \
159 if (flags & MONITOR_FLAG_##_f) \
160 local->fif_##_s += offset; \
161 } while (0)
162
163 ADJUST(FCSFAIL, fcsfail);
164 ADJUST(PLCPFAIL, plcpfail);
165 ADJUST(CONTROL, control);
166 ADJUST(CONTROL, pspoll);
167 ADJUST(OTHER_BSS, other_bss);
168
169 #undef ADJUST
170 }
171
172 /*
173 * NOTE: Be very careful when changing this function, it must NOT return
174 * an error on interface type changes that have been pre-checked, so most
175 * checks should be in ieee80211_check_concurrent_iface.
176 */
ieee80211_do_open(struct net_device * dev,bool coming_up)177 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
178 {
179 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
180 struct ieee80211_local *local = sdata->local;
181 struct sta_info *sta;
182 u32 changed = 0;
183 int res;
184 u32 hw_reconf_flags = 0;
185
186 switch (sdata->vif.type) {
187 case NL80211_IFTYPE_WDS:
188 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
189 return -ENOLINK;
190 break;
191 case NL80211_IFTYPE_AP_VLAN: {
192 struct ieee80211_sub_if_data *master;
193
194 if (!sdata->bss)
195 return -ENOLINK;
196
197 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
198
199 master = container_of(sdata->bss,
200 struct ieee80211_sub_if_data, u.ap);
201 sdata->control_port_protocol =
202 master->control_port_protocol;
203 sdata->control_port_no_encrypt =
204 master->control_port_no_encrypt;
205 break;
206 }
207 case NL80211_IFTYPE_AP:
208 sdata->bss = &sdata->u.ap;
209 break;
210 case NL80211_IFTYPE_MESH_POINT:
211 case NL80211_IFTYPE_STATION:
212 case NL80211_IFTYPE_MONITOR:
213 case NL80211_IFTYPE_ADHOC:
214 /* no special treatment */
215 break;
216 case NL80211_IFTYPE_UNSPECIFIED:
217 case NUM_NL80211_IFTYPES:
218 case NL80211_IFTYPE_P2P_CLIENT:
219 case NL80211_IFTYPE_P2P_GO:
220 /* cannot happen */
221 WARN_ON(1);
222 break;
223 }
224
225 if (local->open_count == 0) {
226 res = drv_start(local);
227 if (res)
228 goto err_del_bss;
229 if (local->ops->napi_poll)
230 napi_enable(&local->napi);
231 /* we're brought up, everything changes */
232 hw_reconf_flags = ~0;
233 ieee80211_led_radio(local, true);
234 ieee80211_mod_tpt_led_trig(local,
235 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
236 }
237
238 /*
239 * Copy the hopefully now-present MAC address to
240 * this interface, if it has the special null one.
241 */
242 if (is_zero_ether_addr(dev->dev_addr)) {
243 memcpy(dev->dev_addr,
244 local->hw.wiphy->perm_addr,
245 ETH_ALEN);
246 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
247
248 if (!is_valid_ether_addr(dev->dev_addr)) {
249 if (!local->open_count)
250 drv_stop(local);
251 return -EADDRNOTAVAIL;
252 }
253 }
254
255 switch (sdata->vif.type) {
256 case NL80211_IFTYPE_AP_VLAN:
257 /* no need to tell driver */
258 break;
259 case NL80211_IFTYPE_MONITOR:
260 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
261 local->cooked_mntrs++;
262 break;
263 }
264
265 /* must be before the call to ieee80211_configure_filter */
266 local->monitors++;
267 if (local->monitors == 1) {
268 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
269 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
270 }
271
272 ieee80211_adjust_monitor_flags(sdata, 1);
273 ieee80211_configure_filter(local);
274
275 netif_carrier_on(dev);
276 break;
277 default:
278 if (coming_up) {
279 res = drv_add_interface(local, sdata);
280 if (res)
281 goto err_stop;
282 }
283
284 if (sdata->vif.type == NL80211_IFTYPE_AP) {
285 local->fif_pspoll++;
286 local->fif_probe_req++;
287
288 ieee80211_configure_filter(local);
289 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
290 local->fif_probe_req++;
291 }
292
293 changed |= ieee80211_reset_erp_info(sdata);
294 ieee80211_bss_info_change_notify(sdata, changed);
295
296 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
297 sdata->vif.type == NL80211_IFTYPE_ADHOC)
298 netif_carrier_off(dev);
299 else
300 netif_carrier_on(dev);
301
302 /*
303 * set default queue parameters so drivers don't
304 * need to initialise the hardware if the hardware
305 * doesn't start up with sane defaults
306 */
307 ieee80211_set_wmm_default(sdata, true);
308 }
309
310 set_bit(SDATA_STATE_RUNNING, &sdata->state);
311
312 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
313 /* Create STA entry for the WDS peer */
314 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
315 GFP_KERNEL);
316 if (!sta) {
317 res = -ENOMEM;
318 goto err_del_interface;
319 }
320
321 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
322 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
323 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
324
325 res = sta_info_insert(sta);
326 if (res) {
327 /* STA has been freed */
328 goto err_del_interface;
329 }
330
331 rate_control_rate_init(sta);
332 }
333
334 /*
335 * set_multicast_list will be invoked by the networking core
336 * which will check whether any increments here were done in
337 * error and sync them down to the hardware as filter flags.
338 */
339 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
340 atomic_inc(&local->iff_allmultis);
341
342 if (sdata->flags & IEEE80211_SDATA_PROMISC)
343 atomic_inc(&local->iff_promiscs);
344
345 mutex_lock(&local->mtx);
346 hw_reconf_flags |= __ieee80211_recalc_idle(local);
347 mutex_unlock(&local->mtx);
348
349 if (coming_up)
350 local->open_count++;
351
352 if (hw_reconf_flags)
353 ieee80211_hw_config(local, hw_reconf_flags);
354
355 ieee80211_recalc_ps(local, -1);
356
357 netif_tx_start_all_queues(dev);
358
359 return 0;
360 err_del_interface:
361 drv_remove_interface(local, sdata);
362 err_stop:
363 if (!local->open_count)
364 drv_stop(local);
365 err_del_bss:
366 sdata->bss = NULL;
367 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
368 list_del(&sdata->u.vlan.list);
369 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
370 return res;
371 }
372
ieee80211_open(struct net_device * dev)373 static int ieee80211_open(struct net_device *dev)
374 {
375 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
376 int err;
377
378 /* fail early if user set an invalid address */
379 if (!is_valid_ether_addr(dev->dev_addr))
380 return -EADDRNOTAVAIL;
381
382 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
383 if (err)
384 return err;
385
386 return ieee80211_do_open(dev, true);
387 }
388
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)389 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
390 bool going_down)
391 {
392 struct ieee80211_local *local = sdata->local;
393 unsigned long flags;
394 struct sk_buff *skb, *tmp;
395 u32 hw_reconf_flags = 0;
396 int i;
397 enum nl80211_channel_type orig_ct;
398
399 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
400
401 if (local->scan_sdata == sdata)
402 ieee80211_scan_cancel(local);
403
404 /*
405 * Stop TX on this interface first.
406 */
407 netif_tx_stop_all_queues(sdata->dev);
408
409 /*
410 * Purge work for this interface.
411 */
412 ieee80211_work_purge(sdata);
413
414 /*
415 * Remove all stations associated with this interface.
416 *
417 * This must be done before calling ops->remove_interface()
418 * because otherwise we can later invoke ops->sta_notify()
419 * whenever the STAs are removed, and that invalidates driver
420 * assumptions about always getting a vif pointer that is valid
421 * (because if we remove a STA after ops->remove_interface()
422 * the driver will have removed the vif info already!)
423 *
424 * This is relevant only in AP, WDS and mesh modes, since in
425 * all other modes we've already removed all stations when
426 * disconnecting etc.
427 */
428 sta_info_flush(local, sdata);
429
430 /*
431 * Don't count this interface for promisc/allmulti while it
432 * is down. dev_mc_unsync() will invoke set_multicast_list
433 * on the master interface which will sync these down to the
434 * hardware as filter flags.
435 */
436 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
437 atomic_dec(&local->iff_allmultis);
438
439 if (sdata->flags & IEEE80211_SDATA_PROMISC)
440 atomic_dec(&local->iff_promiscs);
441
442 if (sdata->vif.type == NL80211_IFTYPE_AP) {
443 local->fif_pspoll--;
444 local->fif_probe_req--;
445 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
446 local->fif_probe_req--;
447 }
448
449 netif_addr_lock_bh(sdata->dev);
450 spin_lock_bh(&local->filter_lock);
451 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
452 sdata->dev->addr_len);
453 spin_unlock_bh(&local->filter_lock);
454 netif_addr_unlock_bh(sdata->dev);
455
456 ieee80211_configure_filter(local);
457
458 del_timer_sync(&local->dynamic_ps_timer);
459 cancel_work_sync(&local->dynamic_ps_enable_work);
460
461 /* APs need special treatment */
462 if (sdata->vif.type == NL80211_IFTYPE_AP) {
463 struct ieee80211_sub_if_data *vlan, *tmpsdata;
464 struct beacon_data *old_beacon =
465 rtnl_dereference(sdata->u.ap.beacon);
466 struct sk_buff *old_probe_resp =
467 rtnl_dereference(sdata->u.ap.probe_resp);
468
469 /* sdata_running will return false, so this will disable */
470 ieee80211_bss_info_change_notify(sdata,
471 BSS_CHANGED_BEACON_ENABLED);
472
473 /* remove beacon and probe response */
474 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
475 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
476 synchronize_rcu();
477 kfree(old_beacon);
478 kfree_skb(old_probe_resp);
479
480 /* down all dependent devices, that is VLANs */
481 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
482 u.vlan.list)
483 dev_close(vlan->dev);
484 WARN_ON(!list_empty(&sdata->u.ap.vlans));
485
486 /* free all potentially still buffered bcast frames */
487 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
488 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
489 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
490 ieee80211_mgd_stop(sdata);
491 }
492
493 if (going_down)
494 local->open_count--;
495
496 switch (sdata->vif.type) {
497 case NL80211_IFTYPE_AP_VLAN:
498 list_del(&sdata->u.vlan.list);
499 /* no need to tell driver */
500 break;
501 case NL80211_IFTYPE_MONITOR:
502 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
503 local->cooked_mntrs--;
504 break;
505 }
506
507 local->monitors--;
508 if (local->monitors == 0) {
509 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
510 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
511 }
512
513 ieee80211_adjust_monitor_flags(sdata, -1);
514 ieee80211_configure_filter(local);
515 break;
516 default:
517 mutex_lock(&local->mtx);
518 if (local->hw_roc_dev == sdata->dev &&
519 local->hw_roc_channel) {
520 /* ignore return value since this is racy */
521 drv_cancel_remain_on_channel(local);
522 ieee80211_queue_work(&local->hw, &local->hw_roc_done);
523 }
524 mutex_unlock(&local->mtx);
525
526 flush_work(&local->hw_roc_start);
527 flush_work(&local->hw_roc_done);
528
529 flush_work(&sdata->work);
530 /*
531 * When we get here, the interface is marked down.
532 * Call synchronize_rcu() to wait for the RX path
533 * should it be using the interface and enqueuing
534 * frames at this very time on another CPU.
535 */
536 synchronize_rcu();
537 skb_queue_purge(&sdata->skb_queue);
538
539 /*
540 * Disable beaconing here for mesh only, AP and IBSS
541 * are already taken care of.
542 */
543 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
544 ieee80211_bss_info_change_notify(sdata,
545 BSS_CHANGED_BEACON_ENABLED);
546
547 /*
548 * Free all remaining keys, there shouldn't be any,
549 * except maybe group keys in AP more or WDS?
550 */
551 ieee80211_free_keys(sdata);
552
553 if (going_down)
554 drv_remove_interface(local, sdata);
555 }
556
557 sdata->bss = NULL;
558
559 mutex_lock(&local->mtx);
560 hw_reconf_flags |= __ieee80211_recalc_idle(local);
561 mutex_unlock(&local->mtx);
562
563 ieee80211_recalc_ps(local, -1);
564
565 if (local->open_count == 0) {
566 if (local->ops->napi_poll)
567 napi_disable(&local->napi);
568 ieee80211_clear_tx_pending(local);
569 ieee80211_stop_device(local);
570
571 /* no reconfiguring after stop! */
572 hw_reconf_flags = 0;
573 }
574
575 /* Re-calculate channel-type, in case there are multiple vifs
576 * on different channel types.
577 */
578 orig_ct = local->_oper_channel_type;
579 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
580
581 /* do after stop to avoid reconfiguring when we stop anyway */
582 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
583 ieee80211_hw_config(local, hw_reconf_flags);
584
585 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
586 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
587 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
589 if (info->control.vif == &sdata->vif) {
590 __skb_unlink(skb, &local->pending[i]);
591 dev_kfree_skb_irq(skb);
592 }
593 }
594 }
595 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
596 }
597
ieee80211_stop(struct net_device * dev)598 static int ieee80211_stop(struct net_device *dev)
599 {
600 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
601
602 ieee80211_do_stop(sdata, true);
603
604 return 0;
605 }
606
ieee80211_set_multicast_list(struct net_device * dev)607 static void ieee80211_set_multicast_list(struct net_device *dev)
608 {
609 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
610 struct ieee80211_local *local = sdata->local;
611 int allmulti, promisc, sdata_allmulti, sdata_promisc;
612
613 allmulti = !!(dev->flags & IFF_ALLMULTI);
614 promisc = !!(dev->flags & IFF_PROMISC);
615 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
616 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
617
618 if (allmulti != sdata_allmulti) {
619 if (dev->flags & IFF_ALLMULTI)
620 atomic_inc(&local->iff_allmultis);
621 else
622 atomic_dec(&local->iff_allmultis);
623 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
624 }
625
626 if (promisc != sdata_promisc) {
627 if (dev->flags & IFF_PROMISC)
628 atomic_inc(&local->iff_promiscs);
629 else
630 atomic_dec(&local->iff_promiscs);
631 sdata->flags ^= IEEE80211_SDATA_PROMISC;
632 }
633 spin_lock_bh(&local->filter_lock);
634 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
635 spin_unlock_bh(&local->filter_lock);
636 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
637 }
638
639 /*
640 * Called when the netdev is removed or, by the code below, before
641 * the interface type changes.
642 */
ieee80211_teardown_sdata(struct net_device * dev)643 static void ieee80211_teardown_sdata(struct net_device *dev)
644 {
645 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
646 struct ieee80211_local *local = sdata->local;
647 int flushed;
648 int i;
649
650 /* free extra data */
651 ieee80211_free_keys(sdata);
652
653 ieee80211_debugfs_remove_netdev(sdata);
654
655 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
656 __skb_queue_purge(&sdata->fragments[i].skb_list);
657 sdata->fragment_next = 0;
658
659 if (ieee80211_vif_is_mesh(&sdata->vif))
660 mesh_rmc_free(sdata);
661
662 flushed = sta_info_flush(local, sdata);
663 WARN_ON(flushed);
664 }
665
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb)666 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
667 struct sk_buff *skb)
668 {
669 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
670 }
671
672 static const struct net_device_ops ieee80211_dataif_ops = {
673 .ndo_open = ieee80211_open,
674 .ndo_stop = ieee80211_stop,
675 .ndo_uninit = ieee80211_teardown_sdata,
676 .ndo_start_xmit = ieee80211_subif_start_xmit,
677 .ndo_set_rx_mode = ieee80211_set_multicast_list,
678 .ndo_change_mtu = ieee80211_change_mtu,
679 .ndo_set_mac_address = ieee80211_change_mac,
680 .ndo_select_queue = ieee80211_netdev_select_queue,
681 };
682
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb)683 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
684 struct sk_buff *skb)
685 {
686 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
687 struct ieee80211_local *local = sdata->local;
688 struct ieee80211_hdr *hdr;
689 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
690
691 if (local->hw.queues < 4)
692 return 0;
693
694 if (skb->len < 4 ||
695 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
696 return 0; /* doesn't matter, frame will be dropped */
697
698 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
699
700 return ieee80211_select_queue_80211(local, skb, hdr);
701 }
702
703 static const struct net_device_ops ieee80211_monitorif_ops = {
704 .ndo_open = ieee80211_open,
705 .ndo_stop = ieee80211_stop,
706 .ndo_uninit = ieee80211_teardown_sdata,
707 .ndo_start_xmit = ieee80211_monitor_start_xmit,
708 .ndo_set_rx_mode = ieee80211_set_multicast_list,
709 .ndo_change_mtu = ieee80211_change_mtu,
710 .ndo_set_mac_address = eth_mac_addr,
711 .ndo_select_queue = ieee80211_monitor_select_queue,
712 };
713
ieee80211_if_setup(struct net_device * dev)714 static void ieee80211_if_setup(struct net_device *dev)
715 {
716 ether_setup(dev);
717 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
718 dev->netdev_ops = &ieee80211_dataif_ops;
719 dev->destructor = free_netdev;
720 }
721
ieee80211_iface_work(struct work_struct * work)722 static void ieee80211_iface_work(struct work_struct *work)
723 {
724 struct ieee80211_sub_if_data *sdata =
725 container_of(work, struct ieee80211_sub_if_data, work);
726 struct ieee80211_local *local = sdata->local;
727 struct sk_buff *skb;
728 struct sta_info *sta;
729 struct ieee80211_ra_tid *ra_tid;
730
731 if (!ieee80211_sdata_running(sdata))
732 return;
733
734 if (local->scanning)
735 return;
736
737 /*
738 * ieee80211_queue_work() should have picked up most cases,
739 * here we'll pick the rest.
740 */
741 if (WARN(local->suspended,
742 "interface work scheduled while going to suspend\n"))
743 return;
744
745 /* first process frames */
746 while ((skb = skb_dequeue(&sdata->skb_queue))) {
747 struct ieee80211_mgmt *mgmt = (void *)skb->data;
748
749 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
750 ra_tid = (void *)&skb->cb;
751 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
752 ra_tid->tid);
753 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
754 ra_tid = (void *)&skb->cb;
755 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
756 ra_tid->tid);
757 } else if (ieee80211_is_action(mgmt->frame_control) &&
758 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
759 int len = skb->len;
760
761 mutex_lock(&local->sta_mtx);
762 sta = sta_info_get_bss(sdata, mgmt->sa);
763 if (sta) {
764 switch (mgmt->u.action.u.addba_req.action_code) {
765 case WLAN_ACTION_ADDBA_REQ:
766 ieee80211_process_addba_request(
767 local, sta, mgmt, len);
768 break;
769 case WLAN_ACTION_ADDBA_RESP:
770 ieee80211_process_addba_resp(local, sta,
771 mgmt, len);
772 break;
773 case WLAN_ACTION_DELBA:
774 ieee80211_process_delba(sdata, sta,
775 mgmt, len);
776 break;
777 default:
778 WARN_ON(1);
779 break;
780 }
781 }
782 mutex_unlock(&local->sta_mtx);
783 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
784 struct ieee80211_hdr *hdr = (void *)mgmt;
785 /*
786 * So the frame isn't mgmt, but frame_control
787 * is at the right place anyway, of course, so
788 * the if statement is correct.
789 *
790 * Warn if we have other data frame types here,
791 * they must not get here.
792 */
793 WARN_ON(hdr->frame_control &
794 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
795 WARN_ON(!(hdr->seq_ctrl &
796 cpu_to_le16(IEEE80211_SCTL_FRAG)));
797 /*
798 * This was a fragment of a frame, received while
799 * a block-ack session was active. That cannot be
800 * right, so terminate the session.
801 */
802 mutex_lock(&local->sta_mtx);
803 sta = sta_info_get_bss(sdata, mgmt->sa);
804 if (sta) {
805 u16 tid = *ieee80211_get_qos_ctl(hdr) &
806 IEEE80211_QOS_CTL_TID_MASK;
807
808 __ieee80211_stop_rx_ba_session(
809 sta, tid, WLAN_BACK_RECIPIENT,
810 WLAN_REASON_QSTA_REQUIRE_SETUP,
811 true);
812 }
813 mutex_unlock(&local->sta_mtx);
814 } else switch (sdata->vif.type) {
815 case NL80211_IFTYPE_STATION:
816 ieee80211_sta_rx_queued_mgmt(sdata, skb);
817 break;
818 case NL80211_IFTYPE_ADHOC:
819 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
820 break;
821 case NL80211_IFTYPE_MESH_POINT:
822 if (!ieee80211_vif_is_mesh(&sdata->vif))
823 break;
824 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
825 break;
826 default:
827 WARN(1, "frame for unexpected interface type");
828 break;
829 }
830
831 kfree_skb(skb);
832 }
833
834 /* then other type-dependent work */
835 switch (sdata->vif.type) {
836 case NL80211_IFTYPE_STATION:
837 ieee80211_sta_work(sdata);
838 break;
839 case NL80211_IFTYPE_ADHOC:
840 ieee80211_ibss_work(sdata);
841 break;
842 case NL80211_IFTYPE_MESH_POINT:
843 if (!ieee80211_vif_is_mesh(&sdata->vif))
844 break;
845 ieee80211_mesh_work(sdata);
846 break;
847 default:
848 break;
849 }
850 }
851
852
853 /*
854 * Helper function to initialise an interface to a specific type.
855 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)856 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
857 enum nl80211_iftype type)
858 {
859 /* clear type-dependent union */
860 memset(&sdata->u, 0, sizeof(sdata->u));
861
862 /* and set some type-dependent values */
863 sdata->vif.type = type;
864 sdata->vif.p2p = false;
865 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
866 sdata->wdev.iftype = type;
867
868 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
869 sdata->control_port_no_encrypt = false;
870
871 sdata->noack_map = 0;
872
873 /* only monitor differs */
874 sdata->dev->type = ARPHRD_ETHER;
875
876 skb_queue_head_init(&sdata->skb_queue);
877 INIT_WORK(&sdata->work, ieee80211_iface_work);
878
879 switch (type) {
880 case NL80211_IFTYPE_P2P_GO:
881 type = NL80211_IFTYPE_AP;
882 sdata->vif.type = type;
883 sdata->vif.p2p = true;
884 /* fall through */
885 case NL80211_IFTYPE_AP:
886 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
887 INIT_LIST_HEAD(&sdata->u.ap.vlans);
888 break;
889 case NL80211_IFTYPE_P2P_CLIENT:
890 type = NL80211_IFTYPE_STATION;
891 sdata->vif.type = type;
892 sdata->vif.p2p = true;
893 /* fall through */
894 case NL80211_IFTYPE_STATION:
895 ieee80211_sta_setup_sdata(sdata);
896 break;
897 case NL80211_IFTYPE_ADHOC:
898 ieee80211_ibss_setup_sdata(sdata);
899 break;
900 case NL80211_IFTYPE_MESH_POINT:
901 if (ieee80211_vif_is_mesh(&sdata->vif))
902 ieee80211_mesh_init_sdata(sdata);
903 break;
904 case NL80211_IFTYPE_MONITOR:
905 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
906 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
907 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
908 MONITOR_FLAG_OTHER_BSS;
909 break;
910 case NL80211_IFTYPE_WDS:
911 case NL80211_IFTYPE_AP_VLAN:
912 break;
913 case NL80211_IFTYPE_UNSPECIFIED:
914 case NUM_NL80211_IFTYPES:
915 BUG();
916 break;
917 }
918
919 ieee80211_debugfs_add_netdev(sdata);
920 }
921
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)922 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
923 enum nl80211_iftype type)
924 {
925 struct ieee80211_local *local = sdata->local;
926 int ret, err;
927 enum nl80211_iftype internal_type = type;
928 bool p2p = false;
929
930 ASSERT_RTNL();
931
932 if (!local->ops->change_interface)
933 return -EBUSY;
934
935 switch (sdata->vif.type) {
936 case NL80211_IFTYPE_AP:
937 case NL80211_IFTYPE_STATION:
938 case NL80211_IFTYPE_ADHOC:
939 /*
940 * Could maybe also all others here?
941 * Just not sure how that interacts
942 * with the RX/config path e.g. for
943 * mesh.
944 */
945 break;
946 default:
947 return -EBUSY;
948 }
949
950 switch (type) {
951 case NL80211_IFTYPE_AP:
952 case NL80211_IFTYPE_STATION:
953 case NL80211_IFTYPE_ADHOC:
954 /*
955 * Could probably support everything
956 * but WDS here (WDS do_open can fail
957 * under memory pressure, which this
958 * code isn't prepared to handle).
959 */
960 break;
961 case NL80211_IFTYPE_P2P_CLIENT:
962 p2p = true;
963 internal_type = NL80211_IFTYPE_STATION;
964 break;
965 case NL80211_IFTYPE_P2P_GO:
966 p2p = true;
967 internal_type = NL80211_IFTYPE_AP;
968 break;
969 default:
970 return -EBUSY;
971 }
972
973 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
974 if (ret)
975 return ret;
976
977 ieee80211_do_stop(sdata, false);
978
979 ieee80211_teardown_sdata(sdata->dev);
980
981 ret = drv_change_interface(local, sdata, internal_type, p2p);
982 if (ret)
983 type = sdata->vif.type;
984
985 ieee80211_setup_sdata(sdata, type);
986
987 err = ieee80211_do_open(sdata->dev, false);
988 WARN(err, "type change: do_open returned %d", err);
989
990 return ret;
991 }
992
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)993 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
994 enum nl80211_iftype type)
995 {
996 int ret;
997
998 ASSERT_RTNL();
999
1000 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1001 return 0;
1002
1003 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1004 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1005 type == NL80211_IFTYPE_ADHOC)
1006 return -EOPNOTSUPP;
1007
1008 if (ieee80211_sdata_running(sdata)) {
1009 ret = ieee80211_runtime_change_iftype(sdata, type);
1010 if (ret)
1011 return ret;
1012 } else {
1013 /* Purge and reset type-dependent state. */
1014 ieee80211_teardown_sdata(sdata->dev);
1015 ieee80211_setup_sdata(sdata, type);
1016 }
1017
1018 /* reset some values that shouldn't be kept across type changes */
1019 sdata->vif.bss_conf.basic_rates =
1020 ieee80211_mandatory_rates(sdata->local,
1021 sdata->local->hw.conf.channel->band);
1022 sdata->drop_unencrypted = 0;
1023 if (type == NL80211_IFTYPE_STATION)
1024 sdata->u.mgd.use_4addr = false;
1025
1026 return 0;
1027 }
1028
ieee80211_assign_perm_addr(struct ieee80211_local * local,struct net_device * dev,enum nl80211_iftype type)1029 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1030 struct net_device *dev,
1031 enum nl80211_iftype type)
1032 {
1033 struct ieee80211_sub_if_data *sdata;
1034 u64 mask, start, addr, val, inc;
1035 u8 *m;
1036 u8 tmp_addr[ETH_ALEN];
1037 int i;
1038
1039 /* default ... something at least */
1040 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1041
1042 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1043 local->hw.wiphy->n_addresses <= 1)
1044 return;
1045
1046
1047 mutex_lock(&local->iflist_mtx);
1048
1049 switch (type) {
1050 case NL80211_IFTYPE_MONITOR:
1051 /* doesn't matter */
1052 break;
1053 case NL80211_IFTYPE_WDS:
1054 case NL80211_IFTYPE_AP_VLAN:
1055 /* match up with an AP interface */
1056 list_for_each_entry(sdata, &local->interfaces, list) {
1057 if (sdata->vif.type != NL80211_IFTYPE_AP)
1058 continue;
1059 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1060 break;
1061 }
1062 /* keep default if no AP interface present */
1063 break;
1064 default:
1065 /* assign a new address if possible -- try n_addresses first */
1066 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1067 bool used = false;
1068
1069 list_for_each_entry(sdata, &local->interfaces, list) {
1070 if (memcmp(local->hw.wiphy->addresses[i].addr,
1071 sdata->vif.addr, ETH_ALEN) == 0) {
1072 used = true;
1073 break;
1074 }
1075 }
1076
1077 if (!used) {
1078 memcpy(dev->perm_addr,
1079 local->hw.wiphy->addresses[i].addr,
1080 ETH_ALEN);
1081 break;
1082 }
1083 }
1084
1085 /* try mask if available */
1086 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1087 break;
1088
1089 m = local->hw.wiphy->addr_mask;
1090 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1091 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1092 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1093
1094 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1095 /* not a contiguous mask ... not handled now! */
1096 printk(KERN_DEBUG "not contiguous\n");
1097 break;
1098 }
1099
1100 m = local->hw.wiphy->perm_addr;
1101 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1102 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1103 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1104
1105 inc = 1ULL<<__ffs64(mask);
1106 val = (start & mask);
1107 addr = (start & ~mask) | (val & mask);
1108 do {
1109 bool used = false;
1110
1111 tmp_addr[5] = addr >> 0*8;
1112 tmp_addr[4] = addr >> 1*8;
1113 tmp_addr[3] = addr >> 2*8;
1114 tmp_addr[2] = addr >> 3*8;
1115 tmp_addr[1] = addr >> 4*8;
1116 tmp_addr[0] = addr >> 5*8;
1117
1118 val += inc;
1119
1120 list_for_each_entry(sdata, &local->interfaces, list) {
1121 if (memcmp(tmp_addr, sdata->vif.addr,
1122 ETH_ALEN) == 0) {
1123 used = true;
1124 break;
1125 }
1126 }
1127
1128 if (!used) {
1129 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1130 break;
1131 }
1132 addr = (start & ~mask) | (val & mask);
1133 } while (addr != start);
1134
1135 break;
1136 }
1137
1138 mutex_unlock(&local->iflist_mtx);
1139 }
1140
ieee80211_if_add(struct ieee80211_local * local,const char * name,struct net_device ** new_dev,enum nl80211_iftype type,struct vif_params * params)1141 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1142 struct net_device **new_dev, enum nl80211_iftype type,
1143 struct vif_params *params)
1144 {
1145 struct net_device *ndev;
1146 struct ieee80211_sub_if_data *sdata = NULL;
1147 int ret, i;
1148
1149 ASSERT_RTNL();
1150
1151 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1152 name, ieee80211_if_setup, local->hw.queues, 1);
1153 if (!ndev)
1154 return -ENOMEM;
1155 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1156
1157 ndev->needed_headroom = local->tx_headroom +
1158 4*6 /* four MAC addresses */
1159 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1160 + 6 /* mesh */
1161 + 8 /* rfc1042/bridge tunnel */
1162 - ETH_HLEN /* ethernet hard_header_len */
1163 + IEEE80211_ENCRYPT_HEADROOM;
1164 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1165
1166 ret = dev_alloc_name(ndev, ndev->name);
1167 if (ret < 0)
1168 goto fail;
1169
1170 ieee80211_assign_perm_addr(local, ndev, type);
1171 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1172 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1173
1174 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1175 sdata = netdev_priv(ndev);
1176 ndev->ieee80211_ptr = &sdata->wdev;
1177 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1178 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1179
1180 /* initialise type-independent data */
1181 sdata->wdev.wiphy = local->hw.wiphy;
1182 sdata->local = local;
1183 sdata->dev = ndev;
1184 #ifdef CONFIG_INET
1185 sdata->arp_filter_state = true;
1186 #endif
1187
1188 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1189 skb_queue_head_init(&sdata->fragments[i].skb_list);
1190
1191 INIT_LIST_HEAD(&sdata->key_list);
1192
1193 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1194 struct ieee80211_supported_band *sband;
1195 sband = local->hw.wiphy->bands[i];
1196 sdata->rc_rateidx_mask[i] =
1197 sband ? (1 << sband->n_bitrates) - 1 : 0;
1198 if (sband)
1199 memcpy(sdata->rc_rateidx_mcs_mask[i],
1200 sband->ht_cap.mcs.rx_mask,
1201 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1202 else
1203 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1204 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1205 }
1206
1207 /* setup type-dependent data */
1208 ieee80211_setup_sdata(sdata, type);
1209
1210 if (params) {
1211 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1212 if (type == NL80211_IFTYPE_STATION)
1213 sdata->u.mgd.use_4addr = params->use_4addr;
1214 }
1215
1216 ret = register_netdevice(ndev);
1217 if (ret)
1218 goto fail;
1219
1220 mutex_lock(&local->iflist_mtx);
1221 list_add_tail_rcu(&sdata->list, &local->interfaces);
1222 mutex_unlock(&local->iflist_mtx);
1223
1224 if (new_dev)
1225 *new_dev = ndev;
1226
1227 return 0;
1228
1229 fail:
1230 free_netdev(ndev);
1231 return ret;
1232 }
1233
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)1234 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1235 {
1236 ASSERT_RTNL();
1237
1238 mutex_lock(&sdata->local->iflist_mtx);
1239 list_del_rcu(&sdata->list);
1240 mutex_unlock(&sdata->local->iflist_mtx);
1241
1242 if (ieee80211_vif_is_mesh(&sdata->vif))
1243 mesh_path_flush_by_iface(sdata);
1244
1245 synchronize_rcu();
1246 unregister_netdevice(sdata->dev);
1247 }
1248
1249 /*
1250 * Remove all interfaces, may only be called at hardware unregistration
1251 * time because it doesn't do RCU-safe list removals.
1252 */
ieee80211_remove_interfaces(struct ieee80211_local * local)1253 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1254 {
1255 struct ieee80211_sub_if_data *sdata, *tmp;
1256 LIST_HEAD(unreg_list);
1257
1258 ASSERT_RTNL();
1259
1260 /*
1261 * Close all AP_VLAN interfaces first, as otherwise they
1262 * might be closed while the AP interface they belong to
1263 * is closed, causing unregister_netdevice_many() to crash.
1264 */
1265 list_for_each_entry(sdata, &local->interfaces, list)
1266 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1267 dev_close(sdata->dev);
1268
1269 mutex_lock(&local->iflist_mtx);
1270 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1271 list_del(&sdata->list);
1272
1273 if (ieee80211_vif_is_mesh(&sdata->vif))
1274 mesh_path_flush_by_iface(sdata);
1275
1276 unregister_netdevice_queue(sdata->dev, &unreg_list);
1277 }
1278 mutex_unlock(&local->iflist_mtx);
1279 unregister_netdevice_many(&unreg_list);
1280 list_del(&unreg_list);
1281 }
1282
ieee80211_idle_off(struct ieee80211_local * local,const char * reason)1283 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1284 const char *reason)
1285 {
1286 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1287 return 0;
1288
1289 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1290 wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1291 #endif
1292
1293 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1294 return IEEE80211_CONF_CHANGE_IDLE;
1295 }
1296
ieee80211_idle_on(struct ieee80211_local * local)1297 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1298 {
1299 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1300 return 0;
1301
1302 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1303 wiphy_debug(local->hw.wiphy, "device now idle\n");
1304 #endif
1305
1306 drv_flush(local, false);
1307
1308 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1309 return IEEE80211_CONF_CHANGE_IDLE;
1310 }
1311
__ieee80211_recalc_idle(struct ieee80211_local * local)1312 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1313 {
1314 struct ieee80211_sub_if_data *sdata;
1315 int count = 0;
1316 bool working = false, scanning = false, hw_roc = false;
1317 struct ieee80211_work *wk;
1318 unsigned int led_trig_start = 0, led_trig_stop = 0;
1319
1320 #ifdef CONFIG_PROVE_LOCKING
1321 WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1322 !lockdep_is_held(&local->iflist_mtx));
1323 #endif
1324 lockdep_assert_held(&local->mtx);
1325
1326 list_for_each_entry(sdata, &local->interfaces, list) {
1327 if (!ieee80211_sdata_running(sdata)) {
1328 sdata->vif.bss_conf.idle = true;
1329 continue;
1330 }
1331
1332 sdata->old_idle = sdata->vif.bss_conf.idle;
1333
1334 /* do not count disabled managed interfaces */
1335 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1336 !sdata->u.mgd.associated &&
1337 !sdata->u.mgd.auth_data &&
1338 !sdata->u.mgd.assoc_data) {
1339 sdata->vif.bss_conf.idle = true;
1340 continue;
1341 }
1342 /* do not count unused IBSS interfaces */
1343 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1344 !sdata->u.ibss.ssid_len) {
1345 sdata->vif.bss_conf.idle = true;
1346 continue;
1347 }
1348 /* count everything else */
1349 sdata->vif.bss_conf.idle = false;
1350 count++;
1351 }
1352
1353 list_for_each_entry(wk, &local->work_list, list) {
1354 working = true;
1355 wk->sdata->vif.bss_conf.idle = false;
1356 }
1357
1358 if (local->scan_sdata &&
1359 !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1360 scanning = true;
1361 local->scan_sdata->vif.bss_conf.idle = false;
1362 }
1363
1364 if (local->hw_roc_channel)
1365 hw_roc = true;
1366
1367 list_for_each_entry(sdata, &local->interfaces, list) {
1368 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1369 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1370 continue;
1371 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1372 continue;
1373 if (!ieee80211_sdata_running(sdata))
1374 continue;
1375 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1376 }
1377
1378 if (working || scanning || hw_roc)
1379 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1380 else
1381 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1382
1383 if (count)
1384 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1385 else
1386 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1387
1388 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1389
1390 if (hw_roc)
1391 return ieee80211_idle_off(local, "hw remain-on-channel");
1392 if (working)
1393 return ieee80211_idle_off(local, "working");
1394 if (scanning)
1395 return ieee80211_idle_off(local, "scanning");
1396 if (!count)
1397 return ieee80211_idle_on(local);
1398 else
1399 return ieee80211_idle_off(local, "in use");
1400
1401 return 0;
1402 }
1403
ieee80211_recalc_idle(struct ieee80211_local * local)1404 void ieee80211_recalc_idle(struct ieee80211_local *local)
1405 {
1406 u32 chg;
1407
1408 mutex_lock(&local->iflist_mtx);
1409 chg = __ieee80211_recalc_idle(local);
1410 mutex_unlock(&local->iflist_mtx);
1411 if (chg)
1412 ieee80211_hw_config(local, chg);
1413 }
1414
netdev_notify(struct notifier_block * nb,unsigned long state,void * ndev)1415 static int netdev_notify(struct notifier_block *nb,
1416 unsigned long state,
1417 void *ndev)
1418 {
1419 struct net_device *dev = ndev;
1420 struct ieee80211_sub_if_data *sdata;
1421
1422 if (state != NETDEV_CHANGENAME)
1423 return 0;
1424
1425 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1426 return 0;
1427
1428 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1429 return 0;
1430
1431 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1432
1433 memcpy(sdata->name, dev->name, IFNAMSIZ);
1434
1435 ieee80211_debugfs_rename_netdev(sdata);
1436 return 0;
1437 }
1438
1439 static struct notifier_block mac80211_netdev_notifier = {
1440 .notifier_call = netdev_notify,
1441 };
1442
ieee80211_iface_init(void)1443 int ieee80211_iface_init(void)
1444 {
1445 return register_netdevice_notifier(&mac80211_netdev_notifier);
1446 }
1447
ieee80211_iface_exit(void)1448 void ieee80211_iface_exit(void)
1449 {
1450 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1451 }
1452