projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
[deliverable/linux.git] / net / mac80211 / iface.c
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
46 static u32 ieee80211_idle_off(struct ieee80211_local *local,
47 const char *reason)
48 {
49 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
50 return 0;
51
52 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
53 return IEEE80211_CONF_CHANGE_IDLE;
54 }
55
56 static u32 ieee80211_idle_on(struct ieee80211_local *local)
57 {
58 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
59 return 0;
60
61 drv_flush(local, false);
62
63 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
64 return IEEE80211_CONF_CHANGE_IDLE;
65 }
66
67 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
68 {
69 struct ieee80211_sub_if_data *sdata;
70 int count = 0;
71 bool working = false, scanning = false;
72 unsigned int led_trig_start = 0, led_trig_stop = 0;
73 struct ieee80211_roc_work *roc;
74
75 #ifdef CONFIG_PROVE_LOCKING
76 WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
77 !lockdep_is_held(&local->iflist_mtx));
78 #endif
79 lockdep_assert_held(&local->mtx);
80
81 list_for_each_entry(sdata, &local->interfaces, list) {
82 if (!ieee80211_sdata_running(sdata)) {
83 sdata->vif.bss_conf.idle = true;
84 continue;
85 }
86
87 sdata->old_idle = sdata->vif.bss_conf.idle;
88
89 /* do not count disabled managed interfaces */
90 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
91 !sdata->u.mgd.associated &&
92 !sdata->u.mgd.auth_data &&
93 !sdata->u.mgd.assoc_data) {
94 sdata->vif.bss_conf.idle = true;
95 continue;
96 }
97 /* do not count unused IBSS interfaces */
98 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
99 !sdata->u.ibss.ssid_len) {
100 sdata->vif.bss_conf.idle = true;
101 continue;
102 }
103
104 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
105 continue;
106
107 /* count everything else */
108 sdata->vif.bss_conf.idle = false;
109 count++;
110 }
111
112 if (!local->ops->remain_on_channel) {
113 list_for_each_entry(roc, &local->roc_list, list) {
114 working = true;
115 roc->sdata->vif.bss_conf.idle = false;
116 }
117 }
118
119 sdata = rcu_dereference_protected(local->scan_sdata,
120 lockdep_is_held(&local->mtx));
121 if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
122 scanning = true;
123 sdata->vif.bss_conf.idle = false;
124 }
125
126 list_for_each_entry(sdata, &local->interfaces, list) {
127 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
128 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
129 sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
130 continue;
131 if (sdata->old_idle == sdata->vif.bss_conf.idle)
132 continue;
133 if (!ieee80211_sdata_running(sdata))
134 continue;
135 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
136 }
137
138 if (working || scanning)
139 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
140 else
141 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
142
143 if (count)
144 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
145 else
146 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
147
148 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
149
150 if (working)
151 return ieee80211_idle_off(local, "working");
152 if (scanning)
153 return ieee80211_idle_off(local, "scanning");
154 if (!count)
155 return ieee80211_idle_on(local);
156 else
157 return ieee80211_idle_off(local, "in use");
158
159 return 0;
160 }
161
162 void ieee80211_recalc_idle(struct ieee80211_local *local)
163 {
164 u32 chg;
165
166 mutex_lock(&local->iflist_mtx);
167 chg = __ieee80211_recalc_idle(local);
168 mutex_unlock(&local->iflist_mtx);
169 if (chg)
170 ieee80211_hw_config(local, chg);
171 }
172
173 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
174 {
175 int meshhdrlen;
176 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
177
178 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
179
180 /* FIX: what would be proper limits for MTU?
181 * This interface uses 802.3 frames. */
182 if (new_mtu < 256 ||
183 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
184 return -EINVAL;
185 }
186
187 dev->mtu = new_mtu;
188 return 0;
189 }
190
191 static int ieee80211_change_mac(struct net_device *dev, void *addr)
192 {
193 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
194 struct sockaddr *sa = addr;
195 int ret;
196
197 if (ieee80211_sdata_running(sdata))
198 return -EBUSY;
199
200 ret = eth_mac_addr(dev, sa);
201
202 if (ret == 0)
203 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
204
205 return ret;
206 }
207
208 static inline int identical_mac_addr_allowed(int type1, int type2)
209 {
210 return type1 == NL80211_IFTYPE_MONITOR ||
211 type2 == NL80211_IFTYPE_MONITOR ||
212 type1 == NL80211_IFTYPE_P2P_DEVICE ||
213 type2 == NL80211_IFTYPE_P2P_DEVICE ||
214 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
215 (type1 == NL80211_IFTYPE_WDS &&
216 (type2 == NL80211_IFTYPE_WDS ||
217 type2 == NL80211_IFTYPE_AP)) ||
218 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
219 (type1 == NL80211_IFTYPE_AP_VLAN &&
220 (type2 == NL80211_IFTYPE_AP ||
221 type2 == NL80211_IFTYPE_AP_VLAN));
222 }
223
224 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
225 enum nl80211_iftype iftype)
226 {
227 struct ieee80211_local *local = sdata->local;
228 struct ieee80211_sub_if_data *nsdata;
229
230 ASSERT_RTNL();
231
232 /* we hold the RTNL here so can safely walk the list */
233 list_for_each_entry(nsdata, &local->interfaces, list) {
234 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
235 /*
236 * Allow only a single IBSS interface to be up at any
237 * time. This is restricted because beacon distribution
238 * cannot work properly if both are in the same IBSS.
239 *
240 * To remove this restriction we'd have to disallow them
241 * from setting the same SSID on different IBSS interfaces
242 * belonging to the same hardware. Then, however, we're
243 * faced with having to adopt two different TSF timers...
244 */
245 if (iftype == NL80211_IFTYPE_ADHOC &&
246 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
247 return -EBUSY;
248
249 /*
250 * The remaining checks are only performed for interfaces
251 * with the same MAC address.
252 */
253 if (!ether_addr_equal(sdata->vif.addr,
254 nsdata->vif.addr))
255 continue;
256
257 /*
258 * check whether it may have the same address
259 */
260 if (!identical_mac_addr_allowed(iftype,
261 nsdata->vif.type))
262 return -ENOTUNIQ;
263
264 /*
265 * can only add VLANs to enabled APs
266 */
267 if (iftype == NL80211_IFTYPE_AP_VLAN &&
268 nsdata->vif.type == NL80211_IFTYPE_AP)
269 sdata->bss = &nsdata->u.ap;
270 }
271 }
272
273 return 0;
274 }
275
276 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
277 {
278 int n_queues = sdata->local->hw.queues;
279 int i;
280
281 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
282 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
283 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
284 IEEE80211_INVAL_HW_QUEUE))
285 return -EINVAL;
286 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
287 n_queues))
288 return -EINVAL;
289 }
290 }
291
292 if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
293 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
294 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
295 return 0;
296 }
297
298 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
299 return -EINVAL;
300
301 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
302 return -EINVAL;
303
304 return 0;
305 }
306
307 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
308 const int offset)
309 {
310 struct ieee80211_local *local = sdata->local;
311 u32 flags = sdata->u.mntr_flags;
312
313 #define ADJUST(_f, _s) do { \
314 if (flags & MONITOR_FLAG_##_f) \
315 local->fif_##_s += offset; \
316 } while (0)
317
318 ADJUST(FCSFAIL, fcsfail);
319 ADJUST(PLCPFAIL, plcpfail);
320 ADJUST(CONTROL, control);
321 ADJUST(CONTROL, pspoll);
322 ADJUST(OTHER_BSS, other_bss);
323
324 #undef ADJUST
325 }
326
327 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
328 {
329 struct ieee80211_local *local = sdata->local;
330 int i;
331
332 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
333 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
334 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
335 else if (local->hw.queues >= IEEE80211_NUM_ACS)
336 sdata->vif.hw_queue[i] = i;
337 else
338 sdata->vif.hw_queue[i] = 0;
339 }
340 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
341 }
342
343 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
344 {
345 struct ieee80211_sub_if_data *sdata;
346 int ret = 0;
347
348 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
349 return 0;
350
351 mutex_lock(&local->iflist_mtx);
352
353 if (local->monitor_sdata)
354 goto out_unlock;
355
356 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
357 if (!sdata) {
358 ret = -ENOMEM;
359 goto out_unlock;
360 }
361
362 /* set up data */
363 sdata->local = local;
364 sdata->vif.type = NL80211_IFTYPE_MONITOR;
365 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
366 wiphy_name(local->hw.wiphy));
367
368 ieee80211_set_default_queues(sdata);
369
370 ret = drv_add_interface(local, sdata);
371 if (WARN_ON(ret)) {
372 /* ok .. stupid driver, it asked for this! */
373 kfree(sdata);
374 goto out_unlock;
375 }
376
377 ret = ieee80211_check_queues(sdata);
378 if (ret) {
379 kfree(sdata);
380 goto out_unlock;
381 }
382
383 rcu_assign_pointer(local->monitor_sdata, sdata);
384 out_unlock:
385 mutex_unlock(&local->iflist_mtx);
386 return ret;
387 }
388
389 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
390 {
391 struct ieee80211_sub_if_data *sdata;
392
393 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
394 return;
395
396 mutex_lock(&local->iflist_mtx);
397
398 sdata = rcu_dereference_protected(local->monitor_sdata,
399 lockdep_is_held(&local->iflist_mtx));
400 if (!sdata)
401 goto out_unlock;
402
403 rcu_assign_pointer(local->monitor_sdata, NULL);
404 synchronize_net();
405
406 drv_remove_interface(local, sdata);
407
408 kfree(sdata);
409 out_unlock:
410 mutex_unlock(&local->iflist_mtx);
411 }
412
413 /*
414 * NOTE: Be very careful when changing this function, it must NOT return
415 * an error on interface type changes that have been pre-checked, so most
416 * checks should be in ieee80211_check_concurrent_iface.
417 */
418 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
419 {
420 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
421 struct net_device *dev = wdev->netdev;
422 struct ieee80211_local *local = sdata->local;
423 struct sta_info *sta;
424 u32 changed = 0;
425 int res;
426 u32 hw_reconf_flags = 0;
427
428 switch (sdata->vif.type) {
429 case NL80211_IFTYPE_WDS:
430 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
431 return -ENOLINK;
432 break;
433 case NL80211_IFTYPE_AP_VLAN: {
434 struct ieee80211_sub_if_data *master;
435
436 if (!sdata->bss)
437 return -ENOLINK;
438
439 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
440
441 master = container_of(sdata->bss,
442 struct ieee80211_sub_if_data, u.ap);
443 sdata->control_port_protocol =
444 master->control_port_protocol;
445 sdata->control_port_no_encrypt =
446 master->control_port_no_encrypt;
447 break;
448 }
449 case NL80211_IFTYPE_AP:
450 sdata->bss = &sdata->u.ap;
451 break;
452 case NL80211_IFTYPE_MESH_POINT:
453 case NL80211_IFTYPE_STATION:
454 case NL80211_IFTYPE_MONITOR:
455 case NL80211_IFTYPE_ADHOC:
456 case NL80211_IFTYPE_P2P_DEVICE:
457 /* no special treatment */
458 break;
459 case NL80211_IFTYPE_UNSPECIFIED:
460 case NUM_NL80211_IFTYPES:
461 case NL80211_IFTYPE_P2P_CLIENT:
462 case NL80211_IFTYPE_P2P_GO:
463 /* cannot happen */
464 WARN_ON(1);
465 break;
466 }
467
468 if (local->open_count == 0) {
469 res = drv_start(local);
470 if (res)
471 goto err_del_bss;
472 if (local->ops->napi_poll)
473 napi_enable(&local->napi);
474 /* we're brought up, everything changes */
475 hw_reconf_flags = ~0;
476 ieee80211_led_radio(local, true);
477 ieee80211_mod_tpt_led_trig(local,
478 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
479 }
480
481 /*
482 * Copy the hopefully now-present MAC address to
483 * this interface, if it has the special null one.
484 */
485 if (dev && is_zero_ether_addr(dev->dev_addr)) {
486 memcpy(dev->dev_addr,
487 local->hw.wiphy->perm_addr,
488 ETH_ALEN);
489 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
490
491 if (!is_valid_ether_addr(dev->dev_addr)) {
492 res = -EADDRNOTAVAIL;
493 goto err_stop;
494 }
495 }
496
497 switch (sdata->vif.type) {
498 case NL80211_IFTYPE_AP_VLAN:
499 /* no need to tell driver, but set carrier */
500 if (rtnl_dereference(sdata->bss->beacon))
501 netif_carrier_on(dev);
502 else
503 netif_carrier_off(dev);
504 break;
505 case NL80211_IFTYPE_MONITOR:
506 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
507 local->cooked_mntrs++;
508 break;
509 }
510
511 if (local->monitors == 0 && local->open_count == 0) {
512 res = ieee80211_add_virtual_monitor(local);
513 if (res)
514 goto err_stop;
515 }
516
517 /* must be before the call to ieee80211_configure_filter */
518 local->monitors++;
519 if (local->monitors == 1) {
520 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
521 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
522 }
523
524 ieee80211_adjust_monitor_flags(sdata, 1);
525 ieee80211_configure_filter(local);
526
527 netif_carrier_on(dev);
528 break;
529 default:
530 if (coming_up) {
531 ieee80211_del_virtual_monitor(local);
532
533 res = drv_add_interface(local, sdata);
534 if (res)
535 goto err_stop;
536 res = ieee80211_check_queues(sdata);
537 if (res)
538 goto err_del_interface;
539 }
540
541 if (sdata->vif.type == NL80211_IFTYPE_AP) {
542 local->fif_pspoll++;
543 local->fif_probe_req++;
544
545 ieee80211_configure_filter(local);
546 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
547 local->fif_probe_req++;
548 }
549
550 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
551 changed |= ieee80211_reset_erp_info(sdata);
552 ieee80211_bss_info_change_notify(sdata, changed);
553
554 switch (sdata->vif.type) {
555 case NL80211_IFTYPE_STATION:
556 case NL80211_IFTYPE_ADHOC:
557 case NL80211_IFTYPE_AP:
558 case NL80211_IFTYPE_MESH_POINT:
559 netif_carrier_off(dev);
560 break;
561 case NL80211_IFTYPE_WDS:
562 case NL80211_IFTYPE_P2P_DEVICE:
563 break;
564 default:
565 netif_carrier_on(dev);
566 }
567
568 /*
569 * set default queue parameters so drivers don't
570 * need to initialise the hardware if the hardware
571 * doesn't start up with sane defaults
572 */
573 ieee80211_set_wmm_default(sdata, true);
574 }
575
576 set_bit(SDATA_STATE_RUNNING, &sdata->state);
577
578 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
579 /* Create STA entry for the WDS peer */
580 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
581 GFP_KERNEL);
582 if (!sta) {
583 res = -ENOMEM;
584 goto err_del_interface;
585 }
586
587 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
588 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
589 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
590
591 res = sta_info_insert(sta);
592 if (res) {
593 /* STA has been freed */
594 goto err_del_interface;
595 }
596
597 rate_control_rate_init(sta);
598 netif_carrier_on(dev);
599 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
600 rcu_assign_pointer(local->p2p_sdata, sdata);
601 }
602
603 /*
604 * set_multicast_list will be invoked by the networking core
605 * which will check whether any increments here were done in
606 * error and sync them down to the hardware as filter flags.
607 */
608 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
609 atomic_inc(&local->iff_allmultis);
610
611 if (sdata->flags & IEEE80211_SDATA_PROMISC)
612 atomic_inc(&local->iff_promiscs);
613
614 mutex_lock(&local->mtx);
615 hw_reconf_flags |= __ieee80211_recalc_idle(local);
616 mutex_unlock(&local->mtx);
617
618 if (coming_up)
619 local->open_count++;
620
621 if (hw_reconf_flags)
622 ieee80211_hw_config(local, hw_reconf_flags);
623
624 ieee80211_recalc_ps(local, -1);
625
626 if (dev)
627 netif_tx_start_all_queues(dev);
628
629 return 0;
630 err_del_interface:
631 drv_remove_interface(local, sdata);
632 err_stop:
633 if (!local->open_count)
634 drv_stop(local);
635 err_del_bss:
636 sdata->bss = NULL;
637 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
638 list_del(&sdata->u.vlan.list);
639 /* might already be clear but that doesn't matter */
640 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
641 return res;
642 }
643
644 static int ieee80211_open(struct net_device *dev)
645 {
646 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
647 int err;
648
649 /* fail early if user set an invalid address */
650 if (!is_valid_ether_addr(dev->dev_addr))
651 return -EADDRNOTAVAIL;
652
653 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
654 if (err)
655 return err;
656
657 return ieee80211_do_open(&sdata->wdev, true);
658 }
659
660 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
661 bool going_down)
662 {
663 struct ieee80211_local *local = sdata->local;
664 unsigned long flags;
665 struct sk_buff *skb, *tmp;
666 u32 hw_reconf_flags = 0;
667 int i;
668 enum nl80211_channel_type orig_ct;
669
670 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
671
672 if (rcu_access_pointer(local->scan_sdata) == sdata)
673 ieee80211_scan_cancel(local);
674
675 /*
676 * Stop TX on this interface first.
677 */
678 if (sdata->dev)
679 netif_tx_stop_all_queues(sdata->dev);
680
681 ieee80211_roc_purge(sdata);
682
683 /*
684 * Remove all stations associated with this interface.
685 *
686 * This must be done before calling ops->remove_interface()
687 * because otherwise we can later invoke ops->sta_notify()
688 * whenever the STAs are removed, and that invalidates driver
689 * assumptions about always getting a vif pointer that is valid
690 * (because if we remove a STA after ops->remove_interface()
691 * the driver will have removed the vif info already!)
692 *
693 * This is relevant only in AP, WDS and mesh modes, since in
694 * all other modes we've already removed all stations when
695 * disconnecting etc.
696 */
697 sta_info_flush(local, sdata);
698
699 /*
700 * Don't count this interface for promisc/allmulti while it
701 * is down. dev_mc_unsync() will invoke set_multicast_list
702 * on the master interface which will sync these down to the
703 * hardware as filter flags.
704 */
705 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
706 atomic_dec(&local->iff_allmultis);
707
708 if (sdata->flags & IEEE80211_SDATA_PROMISC)
709 atomic_dec(&local->iff_promiscs);
710
711 if (sdata->vif.type == NL80211_IFTYPE_AP) {
712 local->fif_pspoll--;
713 local->fif_probe_req--;
714 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
715 local->fif_probe_req--;
716 }
717
718 if (sdata->dev) {
719 netif_addr_lock_bh(sdata->dev);
720 spin_lock_bh(&local->filter_lock);
721 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
722 sdata->dev->addr_len);
723 spin_unlock_bh(&local->filter_lock);
724 netif_addr_unlock_bh(sdata->dev);
725
726 ieee80211_configure_filter(local);
727 }
728
729 del_timer_sync(&local->dynamic_ps_timer);
730 cancel_work_sync(&local->dynamic_ps_enable_work);
731
732 /* APs need special treatment */
733 if (sdata->vif.type == NL80211_IFTYPE_AP) {
734 struct ieee80211_sub_if_data *vlan, *tmpsdata;
735 struct beacon_data *old_beacon =
736 rtnl_dereference(sdata->u.ap.beacon);
737 struct probe_resp *old_probe_resp =
738 rtnl_dereference(sdata->u.ap.probe_resp);
739
740 /* sdata_running will return false, so this will disable */
741 ieee80211_bss_info_change_notify(sdata,
742 BSS_CHANGED_BEACON_ENABLED);
743
744 /* remove beacon and probe response */
745 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
746 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
747 synchronize_rcu();
748 kfree(old_beacon);
749 kfree(old_probe_resp);
750
751 /* down all dependent devices, that is VLANs */
752 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
753 u.vlan.list)
754 dev_close(vlan->dev);
755 WARN_ON(!list_empty(&sdata->u.ap.vlans));
756
757 /* free all potentially still buffered bcast frames */
758 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
759 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
760 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
761 ieee80211_mgd_stop(sdata);
762 }
763
764 if (going_down)
765 local->open_count--;
766
767 switch (sdata->vif.type) {
768 case NL80211_IFTYPE_AP_VLAN:
769 list_del(&sdata->u.vlan.list);
770 /* no need to tell driver */
771 break;
772 case NL80211_IFTYPE_MONITOR:
773 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
774 local->cooked_mntrs--;
775 break;
776 }
777
778 local->monitors--;
779 if (local->monitors == 0) {
780 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
781 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
782 ieee80211_del_virtual_monitor(local);
783 }
784
785 ieee80211_adjust_monitor_flags(sdata, -1);
786 ieee80211_configure_filter(local);
787 break;
788 case NL80211_IFTYPE_P2P_DEVICE:
789 /* relies on synchronize_rcu() below */
790 rcu_assign_pointer(local->p2p_sdata, NULL);
791 /* fall through */
792 default:
793 flush_work(&sdata->work);
794 /*
795 * When we get here, the interface is marked down.
796 * Call rcu_barrier() to wait both for the RX path
797 * should it be using the interface and enqueuing
798 * frames at this very time on another CPU, and
799 * for the sta free call_rcu callbacks.
800 */
801 rcu_barrier();
802
803 /*
804 * free_sta_rcu() enqueues a work for the actual
805 * sta cleanup, so we need to flush it while
806 * sdata is still valid.
807 */
808 flush_workqueue(local->workqueue);
809
810 skb_queue_purge(&sdata->skb_queue);
811
812 /*
813 * Free all remaining keys, there shouldn't be any,
814 * except maybe group keys in AP more or WDS?
815 */
816 ieee80211_free_keys(sdata);
817
818 if (going_down)
819 drv_remove_interface(local, sdata);
820 }
821
822 sdata->bss = NULL;
823
824 mutex_lock(&local->mtx);
825 hw_reconf_flags |= __ieee80211_recalc_idle(local);
826 mutex_unlock(&local->mtx);
827
828 ieee80211_recalc_ps(local, -1);
829
830 if (local->open_count == 0) {
831 if (local->ops->napi_poll)
832 napi_disable(&local->napi);
833 ieee80211_clear_tx_pending(local);
834 ieee80211_stop_device(local);
835
836 /* no reconfiguring after stop! */
837 hw_reconf_flags = 0;
838 }
839
840 /* Re-calculate channel-type, in case there are multiple vifs
841 * on different channel types.
842 */
843 orig_ct = local->_oper_channel_type;
844 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
845
846 /* do after stop to avoid reconfiguring when we stop anyway */
847 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
848 ieee80211_hw_config(local, hw_reconf_flags);
849
850 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
851 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
852 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
853 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
854 if (info->control.vif == &sdata->vif) {
855 __skb_unlink(skb, &local->pending[i]);
856 dev_kfree_skb_irq(skb);
857 }
858 }
859 }
860 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
861
862 if (local->monitors == local->open_count && local->monitors > 0)
863 ieee80211_add_virtual_monitor(local);
864 }
865
866 static int ieee80211_stop(struct net_device *dev)
867 {
868 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
869
870 ieee80211_do_stop(sdata, true);
871
872 return 0;
873 }
874
875 static void ieee80211_set_multicast_list(struct net_device *dev)
876 {
877 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
878 struct ieee80211_local *local = sdata->local;
879 int allmulti, promisc, sdata_allmulti, sdata_promisc;
880
881 allmulti = !!(dev->flags & IFF_ALLMULTI);
882 promisc = !!(dev->flags & IFF_PROMISC);
883 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
884 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
885
886 if (allmulti != sdata_allmulti) {
887 if (dev->flags & IFF_ALLMULTI)
888 atomic_inc(&local->iff_allmultis);
889 else
890 atomic_dec(&local->iff_allmultis);
891 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
892 }
893
894 if (promisc != sdata_promisc) {
895 if (dev->flags & IFF_PROMISC)
896 atomic_inc(&local->iff_promiscs);
897 else
898 atomic_dec(&local->iff_promiscs);
899 sdata->flags ^= IEEE80211_SDATA_PROMISC;
900 }
901 spin_lock_bh(&local->filter_lock);
902 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
903 spin_unlock_bh(&local->filter_lock);
904 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
905 }
906
907 /*
908 * Called when the netdev is removed or, by the code below, before
909 * the interface type changes.
910 */
911 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
912 {
913 struct ieee80211_local *local = sdata->local;
914 int flushed;
915 int i;
916
917 /* free extra data */
918 ieee80211_free_keys(sdata);
919
920 ieee80211_debugfs_remove_netdev(sdata);
921
922 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
923 __skb_queue_purge(&sdata->fragments[i].skb_list);
924 sdata->fragment_next = 0;
925
926 if (ieee80211_vif_is_mesh(&sdata->vif))
927 mesh_rmc_free(sdata);
928
929 flushed = sta_info_flush(local, sdata);
930 WARN_ON(flushed);
931 }
932
933 static void ieee80211_uninit(struct net_device *dev)
934 {
935 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
936 }
937
938 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
939 struct sk_buff *skb)
940 {
941 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
942 }
943
944 static const struct net_device_ops ieee80211_dataif_ops = {
945 .ndo_open = ieee80211_open,
946 .ndo_stop = ieee80211_stop,
947 .ndo_uninit = ieee80211_uninit,
948 .ndo_start_xmit = ieee80211_subif_start_xmit,
949 .ndo_set_rx_mode = ieee80211_set_multicast_list,
950 .ndo_change_mtu = ieee80211_change_mtu,
951 .ndo_set_mac_address = ieee80211_change_mac,
952 .ndo_select_queue = ieee80211_netdev_select_queue,
953 };
954
955 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
956 struct sk_buff *skb)
957 {
958 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
959 struct ieee80211_local *local = sdata->local;
960 struct ieee80211_hdr *hdr;
961 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
962
963 if (local->hw.queues < IEEE80211_NUM_ACS)
964 return 0;
965
966 if (skb->len < 4 ||
967 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
968 return 0; /* doesn't matter, frame will be dropped */
969
970 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
971
972 return ieee80211_select_queue_80211(sdata, skb, hdr);
973 }
974
975 static const struct net_device_ops ieee80211_monitorif_ops = {
976 .ndo_open = ieee80211_open,
977 .ndo_stop = ieee80211_stop,
978 .ndo_uninit = ieee80211_uninit,
979 .ndo_start_xmit = ieee80211_monitor_start_xmit,
980 .ndo_set_rx_mode = ieee80211_set_multicast_list,
981 .ndo_change_mtu = ieee80211_change_mtu,
982 .ndo_set_mac_address = eth_mac_addr,
983 .ndo_select_queue = ieee80211_monitor_select_queue,
984 };
985
986 static void ieee80211_if_setup(struct net_device *dev)
987 {
988 ether_setup(dev);
989 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
990 dev->netdev_ops = &ieee80211_dataif_ops;
991 dev->destructor = free_netdev;
992 }
993
994 static void ieee80211_iface_work(struct work_struct *work)
995 {
996 struct ieee80211_sub_if_data *sdata =
997 container_of(work, struct ieee80211_sub_if_data, work);
998 struct ieee80211_local *local = sdata->local;
999 struct sk_buff *skb;
1000 struct sta_info *sta;
1001 struct ieee80211_ra_tid *ra_tid;
1002
1003 if (!ieee80211_sdata_running(sdata))
1004 return;
1005
1006 if (local->scanning)
1007 return;
1008
1009 /*
1010 * ieee80211_queue_work() should have picked up most cases,
1011 * here we'll pick the rest.
1012 */
1013 if (WARN(local->suspended,
1014 "interface work scheduled while going to suspend\n"))
1015 return;
1016
1017 /* first process frames */
1018 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1019 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1020
1021 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1022 ra_tid = (void *)&skb->cb;
1023 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1024 ra_tid->tid);
1025 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1026 ra_tid = (void *)&skb->cb;
1027 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1028 ra_tid->tid);
1029 } else if (ieee80211_is_action(mgmt->frame_control) &&
1030 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1031 int len = skb->len;
1032
1033 mutex_lock(&local->sta_mtx);
1034 sta = sta_info_get_bss(sdata, mgmt->sa);
1035 if (sta) {
1036 switch (mgmt->u.action.u.addba_req.action_code) {
1037 case WLAN_ACTION_ADDBA_REQ:
1038 ieee80211_process_addba_request(
1039 local, sta, mgmt, len);
1040 break;
1041 case WLAN_ACTION_ADDBA_RESP:
1042 ieee80211_process_addba_resp(local, sta,
1043 mgmt, len);
1044 break;
1045 case WLAN_ACTION_DELBA:
1046 ieee80211_process_delba(sdata, sta,
1047 mgmt, len);
1048 break;
1049 default:
1050 WARN_ON(1);
1051 break;
1052 }
1053 }
1054 mutex_unlock(&local->sta_mtx);
1055 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1056 struct ieee80211_hdr *hdr = (void *)mgmt;
1057 /*
1058 * So the frame isn't mgmt, but frame_control
1059 * is at the right place anyway, of course, so
1060 * the if statement is correct.
1061 *
1062 * Warn if we have other data frame types here,
1063 * they must not get here.
1064 */
1065 WARN_ON(hdr->frame_control &
1066 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1067 WARN_ON(!(hdr->seq_ctrl &
1068 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1069 /*
1070 * This was a fragment of a frame, received while
1071 * a block-ack session was active. That cannot be
1072 * right, so terminate the session.
1073 */
1074 mutex_lock(&local->sta_mtx);
1075 sta = sta_info_get_bss(sdata, mgmt->sa);
1076 if (sta) {
1077 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1078 IEEE80211_QOS_CTL_TID_MASK;
1079
1080 __ieee80211_stop_rx_ba_session(
1081 sta, tid, WLAN_BACK_RECIPIENT,
1082 WLAN_REASON_QSTA_REQUIRE_SETUP,
1083 true);
1084 }
1085 mutex_unlock(&local->sta_mtx);
1086 } else switch (sdata->vif.type) {
1087 case NL80211_IFTYPE_STATION:
1088 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1089 break;
1090 case NL80211_IFTYPE_ADHOC:
1091 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1092 break;
1093 case NL80211_IFTYPE_MESH_POINT:
1094 if (!ieee80211_vif_is_mesh(&sdata->vif))
1095 break;
1096 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1097 break;
1098 default:
1099 WARN(1, "frame for unexpected interface type");
1100 break;
1101 }
1102
1103 kfree_skb(skb);
1104 }
1105
1106 /* then other type-dependent work */
1107 switch (sdata->vif.type) {
1108 case NL80211_IFTYPE_STATION:
1109 ieee80211_sta_work(sdata);
1110 break;
1111 case NL80211_IFTYPE_ADHOC:
1112 ieee80211_ibss_work(sdata);
1113 break;
1114 case NL80211_IFTYPE_MESH_POINT:
1115 if (!ieee80211_vif_is_mesh(&sdata->vif))
1116 break;
1117 ieee80211_mesh_work(sdata);
1118 break;
1119 default:
1120 break;
1121 }
1122 }
1123
1124
1125 /*
1126 * Helper function to initialise an interface to a specific type.
1127 */
1128 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1129 enum nl80211_iftype type)
1130 {
1131 /* clear type-dependent union */
1132 memset(&sdata->u, 0, sizeof(sdata->u));
1133
1134 /* and set some type-dependent values */
1135 sdata->vif.type = type;
1136 sdata->vif.p2p = false;
1137 sdata->wdev.iftype = type;
1138
1139 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1140 sdata->control_port_no_encrypt = false;
1141
1142 sdata->noack_map = 0;
1143
1144 /* only monitor/p2p-device differ */
1145 if (sdata->dev) {
1146 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1147 sdata->dev->type = ARPHRD_ETHER;
1148 }
1149
1150 skb_queue_head_init(&sdata->skb_queue);
1151 INIT_WORK(&sdata->work, ieee80211_iface_work);
1152
1153 switch (type) {
1154 case NL80211_IFTYPE_P2P_GO:
1155 type = NL80211_IFTYPE_AP;
1156 sdata->vif.type = type;
1157 sdata->vif.p2p = true;
1158 /* fall through */
1159 case NL80211_IFTYPE_AP:
1160 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1161 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1162 break;
1163 case NL80211_IFTYPE_P2P_CLIENT:
1164 type = NL80211_IFTYPE_STATION;
1165 sdata->vif.type = type;
1166 sdata->vif.p2p = true;
1167 /* fall through */
1168 case NL80211_IFTYPE_STATION:
1169 ieee80211_sta_setup_sdata(sdata);
1170 break;
1171 case NL80211_IFTYPE_ADHOC:
1172 ieee80211_ibss_setup_sdata(sdata);
1173 break;
1174 case NL80211_IFTYPE_MESH_POINT:
1175 if (ieee80211_vif_is_mesh(&sdata->vif))
1176 ieee80211_mesh_init_sdata(sdata);
1177 break;
1178 case NL80211_IFTYPE_MONITOR:
1179 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1180 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1181 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1182 MONITOR_FLAG_OTHER_BSS;
1183 break;
1184 case NL80211_IFTYPE_WDS:
1185 case NL80211_IFTYPE_AP_VLAN:
1186 case NL80211_IFTYPE_P2P_DEVICE:
1187 break;
1188 case NL80211_IFTYPE_UNSPECIFIED:
1189 case NUM_NL80211_IFTYPES:
1190 BUG();
1191 break;
1192 }
1193
1194 ieee80211_debugfs_add_netdev(sdata);
1195 }
1196
1197 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1198 enum nl80211_iftype type)
1199 {
1200 struct ieee80211_local *local = sdata->local;
1201 int ret, err;
1202 enum nl80211_iftype internal_type = type;
1203 bool p2p = false;
1204
1205 ASSERT_RTNL();
1206
1207 if (!local->ops->change_interface)
1208 return -EBUSY;
1209
1210 switch (sdata->vif.type) {
1211 case NL80211_IFTYPE_AP:
1212 case NL80211_IFTYPE_STATION:
1213 case NL80211_IFTYPE_ADHOC:
1214 /*
1215 * Could maybe also all others here?
1216 * Just not sure how that interacts
1217 * with the RX/config path e.g. for
1218 * mesh.
1219 */
1220 break;
1221 default:
1222 return -EBUSY;
1223 }
1224
1225 switch (type) {
1226 case NL80211_IFTYPE_AP:
1227 case NL80211_IFTYPE_STATION:
1228 case NL80211_IFTYPE_ADHOC:
1229 /*
1230 * Could probably support everything
1231 * but WDS here (WDS do_open can fail
1232 * under memory pressure, which this
1233 * code isn't prepared to handle).
1234 */
1235 break;
1236 case NL80211_IFTYPE_P2P_CLIENT:
1237 p2p = true;
1238 internal_type = NL80211_IFTYPE_STATION;
1239 break;
1240 case NL80211_IFTYPE_P2P_GO:
1241 p2p = true;
1242 internal_type = NL80211_IFTYPE_AP;
1243 break;
1244 default:
1245 return -EBUSY;
1246 }
1247
1248 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1249 if (ret)
1250 return ret;
1251
1252 ieee80211_do_stop(sdata, false);
1253
1254 ieee80211_teardown_sdata(sdata);
1255
1256 ret = drv_change_interface(local, sdata, internal_type, p2p);
1257 if (ret)
1258 type = sdata->vif.type;
1259
1260 /*
1261 * Ignore return value here, there's not much we can do since
1262 * the driver changed the interface type internally already.
1263 * The warnings will hopefully make driver authors fix it :-)
1264 */
1265 ieee80211_check_queues(sdata);
1266
1267 ieee80211_setup_sdata(sdata, type);
1268
1269 err = ieee80211_do_open(&sdata->wdev, false);
1270 WARN(err, "type change: do_open returned %d", err);
1271
1272 return ret;
1273 }
1274
1275 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1276 enum nl80211_iftype type)
1277 {
1278 int ret;
1279
1280 ASSERT_RTNL();
1281
1282 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1283 return 0;
1284
1285 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1286 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1287 type == NL80211_IFTYPE_ADHOC)
1288 return -EOPNOTSUPP;
1289
1290 if (ieee80211_sdata_running(sdata)) {
1291 ret = ieee80211_runtime_change_iftype(sdata, type);
1292 if (ret)
1293 return ret;
1294 } else {
1295 /* Purge and reset type-dependent state. */
1296 ieee80211_teardown_sdata(sdata);
1297 ieee80211_setup_sdata(sdata, type);
1298 }
1299
1300 /* reset some values that shouldn't be kept across type changes */
1301 sdata->vif.bss_conf.basic_rates =
1302 ieee80211_mandatory_rates(sdata->local,
1303 sdata->local->oper_channel->band);
1304 sdata->drop_unencrypted = 0;
1305 if (type == NL80211_IFTYPE_STATION)
1306 sdata->u.mgd.use_4addr = false;
1307
1308 return 0;
1309 }
1310
1311 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1312 u8 *perm_addr, enum nl80211_iftype type)
1313 {
1314 struct ieee80211_sub_if_data *sdata;
1315 u64 mask, start, addr, val, inc;
1316 u8 *m;
1317 u8 tmp_addr[ETH_ALEN];
1318 int i;
1319
1320 /* default ... something at least */
1321 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1322
1323 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1324 local->hw.wiphy->n_addresses <= 1)
1325 return;
1326
1327 mutex_lock(&local->iflist_mtx);
1328
1329 switch (type) {
1330 case NL80211_IFTYPE_MONITOR:
1331 /* doesn't matter */
1332 break;
1333 case NL80211_IFTYPE_WDS:
1334 case NL80211_IFTYPE_AP_VLAN:
1335 /* match up with an AP interface */
1336 list_for_each_entry(sdata, &local->interfaces, list) {
1337 if (sdata->vif.type != NL80211_IFTYPE_AP)
1338 continue;
1339 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1340 break;
1341 }
1342 /* keep default if no AP interface present */
1343 break;
1344 case NL80211_IFTYPE_P2P_CLIENT:
1345 case NL80211_IFTYPE_P2P_GO:
1346 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1347 list_for_each_entry(sdata, &local->interfaces, list) {
1348 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1349 continue;
1350 if (!ieee80211_sdata_running(sdata))
1351 continue;
1352 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1353 goto out_unlock;
1354 }
1355 }
1356 /* otherwise fall through */
1357 default:
1358 /* assign a new address if possible -- try n_addresses first */
1359 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1360 bool used = false;
1361
1362 list_for_each_entry(sdata, &local->interfaces, list) {
1363 if (memcmp(local->hw.wiphy->addresses[i].addr,
1364 sdata->vif.addr, ETH_ALEN) == 0) {
1365 used = true;
1366 break;
1367 }
1368 }
1369
1370 if (!used) {
1371 memcpy(perm_addr,
1372 local->hw.wiphy->addresses[i].addr,
1373 ETH_ALEN);
1374 break;
1375 }
1376 }
1377
1378 /* try mask if available */
1379 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1380 break;
1381
1382 m = local->hw.wiphy->addr_mask;
1383 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1384 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1385 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1386
1387 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1388 /* not a contiguous mask ... not handled now! */
1389 pr_info("not contiguous\n");
1390 break;
1391 }
1392
1393 m = local->hw.wiphy->perm_addr;
1394 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1395 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1396 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1397
1398 inc = 1ULL<<__ffs64(mask);
1399 val = (start & mask);
1400 addr = (start & ~mask) | (val & mask);
1401 do {
1402 bool used = false;
1403
1404 tmp_addr[5] = addr >> 0*8;
1405 tmp_addr[4] = addr >> 1*8;
1406 tmp_addr[3] = addr >> 2*8;
1407 tmp_addr[2] = addr >> 3*8;
1408 tmp_addr[1] = addr >> 4*8;
1409 tmp_addr[0] = addr >> 5*8;
1410
1411 val += inc;
1412
1413 list_for_each_entry(sdata, &local->interfaces, list) {
1414 if (memcmp(tmp_addr, sdata->vif.addr,
1415 ETH_ALEN) == 0) {
1416 used = true;
1417 break;
1418 }
1419 }
1420
1421 if (!used) {
1422 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1423 break;
1424 }
1425 addr = (start & ~mask) | (val & mask);
1426 } while (addr != start);
1427
1428 break;
1429 }
1430
1431 out_unlock:
1432 mutex_unlock(&local->iflist_mtx);
1433 }
1434
1435 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1436 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1437 struct vif_params *params)
1438 {
1439 struct net_device *ndev = NULL;
1440 struct ieee80211_sub_if_data *sdata = NULL;
1441 int ret, i;
1442 int txqs = 1;
1443
1444 ASSERT_RTNL();
1445
1446 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1447 struct wireless_dev *wdev;
1448
1449 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1450 GFP_KERNEL);
1451 if (!sdata)
1452 return -ENOMEM;
1453 wdev = &sdata->wdev;
1454
1455 sdata->dev = NULL;
1456 strlcpy(sdata->name, name, IFNAMSIZ);
1457 ieee80211_assign_perm_addr(local, wdev->address, type);
1458 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1459 } else {
1460 if (local->hw.queues >= IEEE80211_NUM_ACS)
1461 txqs = IEEE80211_NUM_ACS;
1462
1463 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1464 local->hw.vif_data_size,
1465 name, ieee80211_if_setup, txqs, 1);
1466 if (!ndev)
1467 return -ENOMEM;
1468 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1469
1470 ndev->needed_headroom = local->tx_headroom +
1471 4*6 /* four MAC addresses */
1472 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1473 + 6 /* mesh */
1474 + 8 /* rfc1042/bridge tunnel */
1475 - ETH_HLEN /* ethernet hard_header_len */
1476 + IEEE80211_ENCRYPT_HEADROOM;
1477 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1478
1479 ret = dev_alloc_name(ndev, ndev->name);
1480 if (ret < 0) {
1481 free_netdev(ndev);
1482 return ret;
1483 }
1484
1485 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1486 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1487 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1488
1489 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1490 sdata = netdev_priv(ndev);
1491 ndev->ieee80211_ptr = &sdata->wdev;
1492 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1493 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1494
1495 sdata->dev = ndev;
1496 }
1497
1498 /* initialise type-independent data */
1499 sdata->wdev.wiphy = local->hw.wiphy;
1500 sdata->local = local;
1501 #ifdef CONFIG_INET
1502 sdata->arp_filter_state = true;
1503 #endif
1504
1505 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1506 skb_queue_head_init(&sdata->fragments[i].skb_list);
1507
1508 INIT_LIST_HEAD(&sdata->key_list);
1509
1510 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1511 struct ieee80211_supported_band *sband;
1512 sband = local->hw.wiphy->bands[i];
1513 sdata->rc_rateidx_mask[i] =
1514 sband ? (1 << sband->n_bitrates) - 1 : 0;
1515 if (sband)
1516 memcpy(sdata->rc_rateidx_mcs_mask[i],
1517 sband->ht_cap.mcs.rx_mask,
1518 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1519 else
1520 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1521 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1522 }
1523
1524 ieee80211_set_default_queues(sdata);
1525
1526 /* setup type-dependent data */
1527 ieee80211_setup_sdata(sdata, type);
1528
1529 if (ndev) {
1530 if (params) {
1531 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1532 if (type == NL80211_IFTYPE_STATION)
1533 sdata->u.mgd.use_4addr = params->use_4addr;
1534 }
1535
1536 ndev->features |= local->hw.netdev_features;
1537
1538 ret = register_netdevice(ndev);
1539 if (ret) {
1540 free_netdev(ndev);
1541 return ret;
1542 }
1543 }
1544
1545 mutex_lock(&local->iflist_mtx);
1546 list_add_tail_rcu(&sdata->list, &local->interfaces);
1547 mutex_unlock(&local->iflist_mtx);
1548
1549 if (new_wdev)
1550 *new_wdev = &sdata->wdev;
1551
1552 return 0;
1553 }
1554
1555 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1556 {
1557 ASSERT_RTNL();
1558
1559 mutex_lock(&sdata->local->iflist_mtx);
1560 list_del_rcu(&sdata->list);
1561 mutex_unlock(&sdata->local->iflist_mtx);
1562
1563 synchronize_rcu();
1564
1565 if (sdata->dev) {
1566 unregister_netdevice(sdata->dev);
1567 } else {
1568 cfg80211_unregister_wdev(&sdata->wdev);
1569 kfree(sdata);
1570 }
1571 }
1572
1573 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1574 {
1575 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1576 return;
1577 ieee80211_do_stop(sdata, true);
1578 ieee80211_teardown_sdata(sdata);
1579 }
1580
1581 /*
1582 * Remove all interfaces, may only be called at hardware unregistration
1583 * time because it doesn't do RCU-safe list removals.
1584 */
1585 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1586 {
1587 struct ieee80211_sub_if_data *sdata, *tmp;
1588 LIST_HEAD(unreg_list);
1589 LIST_HEAD(wdev_list);
1590
1591 ASSERT_RTNL();
1592
1593 mutex_lock(&local->iflist_mtx);
1594 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1595 list_del(&sdata->list);
1596
1597 if (sdata->dev)
1598 unregister_netdevice_queue(sdata->dev, &unreg_list);
1599 else
1600 list_add(&sdata->list, &wdev_list);
1601 }
1602 mutex_unlock(&local->iflist_mtx);
1603 unregister_netdevice_many(&unreg_list);
1604 list_del(&unreg_list);
1605
1606 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1607 list_del(&sdata->list);
1608 cfg80211_unregister_wdev(&sdata->wdev);
1609 kfree(sdata);
1610 }
1611 }
1612
1613 static int netdev_notify(struct notifier_block *nb,
1614 unsigned long state,
1615 void *ndev)
1616 {
1617 struct net_device *dev = ndev;
1618 struct ieee80211_sub_if_data *sdata;
1619
1620 if (state != NETDEV_CHANGENAME)
1621 return 0;
1622
1623 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1624 return 0;
1625
1626 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1627 return 0;
1628
1629 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1630
1631 memcpy(sdata->name, dev->name, IFNAMSIZ);
1632
1633 ieee80211_debugfs_rename_netdev(sdata);
1634 return 0;
1635 }
1636
1637 static struct notifier_block mac80211_netdev_notifier = {
1638 .notifier_call = netdev_notify,
1639 };
1640
1641 int ieee80211_iface_init(void)
1642 {
1643 return register_netdevice_notifier(&mac80211_netdev_notifier);
1644 }
1645
1646 void ieee80211_iface_exit(void)
1647 {
1648 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1649 }
Linux kernel - Deliverables
This page took 0.08666 seconds and 6 git commands to generate.