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ARM: mmp: fix potential NULL dereference
[linux/fpc-iii.git] / net / mac80211 / iface.c
blobbfb57dcc15381a53cdcc3768e943a6fb144b8c3a
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 /* count everything else */
104 sdata->vif.bss_conf.idle = false;
105 count++;
106 }
107
108 if (!local->ops->remain_on_channel) {
109 list_for_each_entry(roc, &local->roc_list, list) {
110 working = true;
111 roc->sdata->vif.bss_conf.idle = false;
112 }
113 }
114
115 sdata = rcu_dereference_protected(local->scan_sdata,
116 lockdep_is_held(&local->mtx));
117 if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
118 scanning = true;
119 sdata->vif.bss_conf.idle = false;
120 }
121
122 list_for_each_entry(sdata, &local->interfaces, list) {
123 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
124 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
125 continue;
126 if (sdata->old_idle == sdata->vif.bss_conf.idle)
127 continue;
128 if (!ieee80211_sdata_running(sdata))
129 continue;
130 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
131 }
132
133 if (working || scanning)
134 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
135 else
136 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
137
138 if (count)
139 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
140 else
141 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
142
143 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
144
145 if (working)
146 return ieee80211_idle_off(local, "working");
147 if (scanning)
148 return ieee80211_idle_off(local, "scanning");
149 if (!count)
150 return ieee80211_idle_on(local);
151 else
152 return ieee80211_idle_off(local, "in use");
153
154 return 0;
155 }
156
157 void ieee80211_recalc_idle(struct ieee80211_local *local)
158 {
159 u32 chg;
160
161 mutex_lock(&local->iflist_mtx);
162 chg = __ieee80211_recalc_idle(local);
163 mutex_unlock(&local->iflist_mtx);
164 if (chg)
165 ieee80211_hw_config(local, chg);
166 }
167
168 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
169 {
170 int meshhdrlen;
171 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
172
173 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
174
175 /* FIX: what would be proper limits for MTU?
176 * This interface uses 802.3 frames. */
177 if (new_mtu < 256 ||
178 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
179 return -EINVAL;
180 }
181
182 dev->mtu = new_mtu;
183 return 0;
184 }
185
186 static int ieee80211_change_mac(struct net_device *dev, void *addr)
187 {
188 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
189 struct sockaddr *sa = addr;
190 int ret;
191
192 if (ieee80211_sdata_running(sdata))
193 return -EBUSY;
194
195 ret = eth_mac_addr(dev, sa);
196
197 if (ret == 0)
198 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
199
200 return ret;
201 }
202
203 static inline int identical_mac_addr_allowed(int type1, int type2)
204 {
205 return type1 == NL80211_IFTYPE_MONITOR ||
206 type2 == NL80211_IFTYPE_MONITOR ||
207 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
208 (type1 == NL80211_IFTYPE_WDS &&
209 (type2 == NL80211_IFTYPE_WDS ||
210 type2 == NL80211_IFTYPE_AP)) ||
211 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
212 (type1 == NL80211_IFTYPE_AP_VLAN &&
213 (type2 == NL80211_IFTYPE_AP ||
214 type2 == NL80211_IFTYPE_AP_VLAN));
215 }
216
217 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
218 enum nl80211_iftype iftype)
219 {
220 struct ieee80211_local *local = sdata->local;
221 struct ieee80211_sub_if_data *nsdata;
222
223 ASSERT_RTNL();
224
225 /* we hold the RTNL here so can safely walk the list */
226 list_for_each_entry(nsdata, &local->interfaces, list) {
227 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
228 /*
229 * Allow only a single IBSS interface to be up at any
230 * time. This is restricted because beacon distribution
231 * cannot work properly if both are in the same IBSS.
232 *
233 * To remove this restriction we'd have to disallow them
234 * from setting the same SSID on different IBSS interfaces
235 * belonging to the same hardware. Then, however, we're
236 * faced with having to adopt two different TSF timers...
237 */
238 if (iftype == NL80211_IFTYPE_ADHOC &&
239 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
240 return -EBUSY;
241
242 /*
243 * The remaining checks are only performed for interfaces
244 * with the same MAC address.
245 */
246 if (!ether_addr_equal(sdata->vif.addr,
247 nsdata->vif.addr))
248 continue;
249
250 /*
251 * check whether it may have the same address
252 */
253 if (!identical_mac_addr_allowed(iftype,
254 nsdata->vif.type))
255 return -ENOTUNIQ;
256
257 /*
258 * can only add VLANs to enabled APs
259 */
260 if (iftype == NL80211_IFTYPE_AP_VLAN &&
261 nsdata->vif.type == NL80211_IFTYPE_AP)
262 sdata->bss = &nsdata->u.ap;
263 }
264 }
265
266 return 0;
267 }
268
269 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
270 {
271 int n_queues = sdata->local->hw.queues;
272 int i;
273
274 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
275 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
276 IEEE80211_INVAL_HW_QUEUE))
277 return -EINVAL;
278 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
279 n_queues))
280 return -EINVAL;
281 }
282
283 if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
284 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
285 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
286 return 0;
287 }
288
289 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
290 return -EINVAL;
291
292 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
293 return -EINVAL;
294
295 return 0;
296 }
297
298 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
299 const int offset)
300 {
301 struct ieee80211_local *local = sdata->local;
302 u32 flags = sdata->u.mntr_flags;
303
304 #define ADJUST(_f, _s) do { \
305 if (flags & MONITOR_FLAG_##_f) \
306 local->fif_##_s += offset; \
307 } while (0)
308
309 ADJUST(FCSFAIL, fcsfail);
310 ADJUST(PLCPFAIL, plcpfail);
311 ADJUST(CONTROL, control);
312 ADJUST(CONTROL, pspoll);
313 ADJUST(OTHER_BSS, other_bss);
314
315 #undef ADJUST
316 }
317
318 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
319 {
320 struct ieee80211_local *local = sdata->local;
321 int i;
322
323 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
324 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
325 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
326 else if (local->hw.queues >= IEEE80211_NUM_ACS)
327 sdata->vif.hw_queue[i] = i;
328 else
329 sdata->vif.hw_queue[i] = 0;
330 }
331 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
332 }
333
334 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
335 {
336 struct ieee80211_sub_if_data *sdata;
337 int ret = 0;
338
339 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
340 return 0;
341
342 mutex_lock(&local->iflist_mtx);
343
344 if (local->monitor_sdata)
345 goto out_unlock;
346
347 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
348 if (!sdata) {
349 ret = -ENOMEM;
350 goto out_unlock;
351 }
352
353 /* set up data */
354 sdata->local = local;
355 sdata->vif.type = NL80211_IFTYPE_MONITOR;
356 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
357 wiphy_name(local->hw.wiphy));
358
359 ieee80211_set_default_queues(sdata);
360
361 ret = drv_add_interface(local, sdata);
362 if (WARN_ON(ret)) {
363 /* ok .. stupid driver, it asked for this! */
364 kfree(sdata);
365 goto out_unlock;
366 }
367
368 ret = ieee80211_check_queues(sdata);
369 if (ret) {
370 kfree(sdata);
371 goto out_unlock;
372 }
373
374 rcu_assign_pointer(local->monitor_sdata, sdata);
375 out_unlock:
376 mutex_unlock(&local->iflist_mtx);
377 return ret;
378 }
379
380 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
381 {
382 struct ieee80211_sub_if_data *sdata;
383
384 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
385 return;
386
387 mutex_lock(&local->iflist_mtx);
388
389 sdata = rcu_dereference_protected(local->monitor_sdata,
390 lockdep_is_held(&local->iflist_mtx));
391 if (!sdata)
392 goto out_unlock;
393
394 rcu_assign_pointer(local->monitor_sdata, NULL);
395 synchronize_net();
396
397 drv_remove_interface(local, sdata);
398
399 kfree(sdata);
400 out_unlock:
401 mutex_unlock(&local->iflist_mtx);
402 }
403
404 /*
405 * NOTE: Be very careful when changing this function, it must NOT return
406 * an error on interface type changes that have been pre-checked, so most
407 * checks should be in ieee80211_check_concurrent_iface.
408 */
409 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
410 {
411 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
412 struct ieee80211_local *local = sdata->local;
413 struct sta_info *sta;
414 u32 changed = 0;
415 int res;
416 u32 hw_reconf_flags = 0;
417
418 switch (sdata->vif.type) {
419 case NL80211_IFTYPE_WDS:
420 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
421 return -ENOLINK;
422 break;
423 case NL80211_IFTYPE_AP_VLAN: {
424 struct ieee80211_sub_if_data *master;
425
426 if (!sdata->bss)
427 return -ENOLINK;
428
429 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
430
431 master = container_of(sdata->bss,
432 struct ieee80211_sub_if_data, u.ap);
433 sdata->control_port_protocol =
434 master->control_port_protocol;
435 sdata->control_port_no_encrypt =
436 master->control_port_no_encrypt;
437 break;
438 }
439 case NL80211_IFTYPE_AP:
440 sdata->bss = &sdata->u.ap;
441 break;
442 case NL80211_IFTYPE_MESH_POINT:
443 case NL80211_IFTYPE_STATION:
444 case NL80211_IFTYPE_MONITOR:
445 case NL80211_IFTYPE_ADHOC:
446 /* no special treatment */
447 break;
448 case NL80211_IFTYPE_UNSPECIFIED:
449 case NUM_NL80211_IFTYPES:
450 case NL80211_IFTYPE_P2P_CLIENT:
451 case NL80211_IFTYPE_P2P_GO:
452 /* cannot happen */
453 WARN_ON(1);
454 break;
455 }
456
457 if (local->open_count == 0) {
458 res = drv_start(local);
459 if (res)
460 goto err_del_bss;
461 if (local->ops->napi_poll)
462 napi_enable(&local->napi);
463 /* we're brought up, everything changes */
464 hw_reconf_flags = ~0;
465 ieee80211_led_radio(local, true);
466 ieee80211_mod_tpt_led_trig(local,
467 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
468 }
469
470 /*
471 * Copy the hopefully now-present MAC address to
472 * this interface, if it has the special null one.
473 */
474 if (is_zero_ether_addr(dev->dev_addr)) {
475 memcpy(dev->dev_addr,
476 local->hw.wiphy->perm_addr,
477 ETH_ALEN);
478 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
479
480 if (!is_valid_ether_addr(dev->dev_addr)) {
481 res = -EADDRNOTAVAIL;
482 goto err_stop;
483 }
484 }
485
486 switch (sdata->vif.type) {
487 case NL80211_IFTYPE_AP_VLAN:
488 /* no need to tell driver, but set carrier */
489 if (rtnl_dereference(sdata->bss->beacon))
490 netif_carrier_on(dev);
491 else
492 netif_carrier_off(dev);
493 break;
494 case NL80211_IFTYPE_MONITOR:
495 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
496 local->cooked_mntrs++;
497 break;
498 }
499
500 if (local->monitors == 0 && local->open_count == 0) {
501 res = ieee80211_add_virtual_monitor(local);
502 if (res)
503 goto err_stop;
504 }
505
506 /* must be before the call to ieee80211_configure_filter */
507 local->monitors++;
508 if (local->monitors == 1) {
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
516 netif_carrier_on(dev);
517 break;
518 default:
519 if (coming_up) {
520 ieee80211_del_virtual_monitor(local);
521
522 res = drv_add_interface(local, sdata);
523 if (res)
524 goto err_stop;
525 res = ieee80211_check_queues(sdata);
526 if (res)
527 goto err_del_interface;
528 }
529
530 if (sdata->vif.type == NL80211_IFTYPE_AP) {
531 local->fif_pspoll++;
532 local->fif_probe_req++;
533
534 ieee80211_configure_filter(local);
535 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
536 local->fif_probe_req++;
537 }
538
539 changed |= ieee80211_reset_erp_info(sdata);
540 ieee80211_bss_info_change_notify(sdata, changed);
541
542 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
543 sdata->vif.type == NL80211_IFTYPE_ADHOC ||
544 sdata->vif.type == NL80211_IFTYPE_AP)
545 netif_carrier_off(dev);
546 else
547 netif_carrier_on(dev);
548
549 /*
550 * set default queue parameters so drivers don't
551 * need to initialise the hardware if the hardware
552 * doesn't start up with sane defaults
553 */
554 ieee80211_set_wmm_default(sdata, true);
555 }
556
557 set_bit(SDATA_STATE_RUNNING, &sdata->state);
558
559 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
560 /* Create STA entry for the WDS peer */
561 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
562 GFP_KERNEL);
563 if (!sta) {
564 res = -ENOMEM;
565 goto err_del_interface;
566 }
567
568 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
569 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
570 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
571
572 res = sta_info_insert(sta);
573 if (res) {
574 /* STA has been freed */
575 goto err_del_interface;
576 }
577
578 rate_control_rate_init(sta);
579 }
580
581 /*
582 * set_multicast_list will be invoked by the networking core
583 * which will check whether any increments here were done in
584 * error and sync them down to the hardware as filter flags.
585 */
586 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
587 atomic_inc(&local->iff_allmultis);
588
589 if (sdata->flags & IEEE80211_SDATA_PROMISC)
590 atomic_inc(&local->iff_promiscs);
591
592 mutex_lock(&local->mtx);
593 hw_reconf_flags |= __ieee80211_recalc_idle(local);
594 mutex_unlock(&local->mtx);
595
596 if (coming_up)
597 local->open_count++;
598
599 if (hw_reconf_flags)
600 ieee80211_hw_config(local, hw_reconf_flags);
601
602 ieee80211_recalc_ps(local, -1);
603
604 netif_tx_start_all_queues(dev);
605
606 return 0;
607 err_del_interface:
608 drv_remove_interface(local, sdata);
609 err_stop:
610 if (!local->open_count)
611 drv_stop(local);
612 err_del_bss:
613 sdata->bss = NULL;
614 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
615 list_del(&sdata->u.vlan.list);
616 /* might already be clear but that doesn't matter */
617 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
618 return res;
619 }
620
621 static int ieee80211_open(struct net_device *dev)
622 {
623 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
624 int err;
625
626 /* fail early if user set an invalid address */
627 if (!is_valid_ether_addr(dev->dev_addr))
628 return -EADDRNOTAVAIL;
629
630 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
631 if (err)
632 return err;
633
634 return ieee80211_do_open(dev, true);
635 }
636
637 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
638 bool going_down)
639 {
640 struct ieee80211_local *local = sdata->local;
641 unsigned long flags;
642 struct sk_buff *skb, *tmp;
643 u32 hw_reconf_flags = 0;
644 int i;
645 enum nl80211_channel_type orig_ct;
646
647 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
648
649 if (rcu_access_pointer(local->scan_sdata) == sdata)
650 ieee80211_scan_cancel(local);
651
652 /*
653 * Stop TX on this interface first.
654 */
655 netif_tx_stop_all_queues(sdata->dev);
656
657 ieee80211_roc_purge(sdata);
658
659 /*
660 * Remove all stations associated with this interface.
661 *
662 * This must be done before calling ops->remove_interface()
663 * because otherwise we can later invoke ops->sta_notify()
664 * whenever the STAs are removed, and that invalidates driver
665 * assumptions about always getting a vif pointer that is valid
666 * (because if we remove a STA after ops->remove_interface()
667 * the driver will have removed the vif info already!)
668 *
669 * This is relevant only in AP, WDS and mesh modes, since in
670 * all other modes we've already removed all stations when
671 * disconnecting etc.
672 */
673 sta_info_flush(local, sdata);
674
675 /*
676 * Don't count this interface for promisc/allmulti while it
677 * is down. dev_mc_unsync() will invoke set_multicast_list
678 * on the master interface which will sync these down to the
679 * hardware as filter flags.
680 */
681 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
682 atomic_dec(&local->iff_allmultis);
683
684 if (sdata->flags & IEEE80211_SDATA_PROMISC)
685 atomic_dec(&local->iff_promiscs);
686
687 if (sdata->vif.type == NL80211_IFTYPE_AP) {
688 local->fif_pspoll--;
689 local->fif_probe_req--;
690 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
691 local->fif_probe_req--;
692 }
693
694 netif_addr_lock_bh(sdata->dev);
695 spin_lock_bh(&local->filter_lock);
696 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
697 sdata->dev->addr_len);
698 spin_unlock_bh(&local->filter_lock);
699 netif_addr_unlock_bh(sdata->dev);
700
701 ieee80211_configure_filter(local);
702
703 del_timer_sync(&local->dynamic_ps_timer);
704 cancel_work_sync(&local->dynamic_ps_enable_work);
705
706 /* APs need special treatment */
707 if (sdata->vif.type == NL80211_IFTYPE_AP) {
708 struct ieee80211_sub_if_data *vlan, *tmpsdata;
709 struct beacon_data *old_beacon =
710 rtnl_dereference(sdata->u.ap.beacon);
711 struct sk_buff *old_probe_resp =
712 rtnl_dereference(sdata->u.ap.probe_resp);
713
714 /* sdata_running will return false, so this will disable */
715 ieee80211_bss_info_change_notify(sdata,
716 BSS_CHANGED_BEACON_ENABLED);
717
718 /* remove beacon and probe response */
719 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
720 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
721 synchronize_rcu();
722 kfree(old_beacon);
723 kfree_skb(old_probe_resp);
724
725 /* down all dependent devices, that is VLANs */
726 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
727 u.vlan.list)
728 dev_close(vlan->dev);
729 WARN_ON(!list_empty(&sdata->u.ap.vlans));
730
731 /* free all potentially still buffered bcast frames */
732 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
733 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
734 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
735 ieee80211_mgd_stop(sdata);
736 }
737
738 if (going_down)
739 local->open_count--;
740
741 switch (sdata->vif.type) {
742 case NL80211_IFTYPE_AP_VLAN:
743 list_del(&sdata->u.vlan.list);
744 /* no need to tell driver */
745 break;
746 case NL80211_IFTYPE_MONITOR:
747 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
748 local->cooked_mntrs--;
749 break;
750 }
751
752 local->monitors--;
753 if (local->monitors == 0) {
754 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
755 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
756 ieee80211_del_virtual_monitor(local);
757 }
758
759 ieee80211_adjust_monitor_flags(sdata, -1);
760 ieee80211_configure_filter(local);
761 break;
762 default:
763 flush_work(&sdata->work);
764 /*
765 * When we get here, the interface is marked down.
766 * Call synchronize_rcu() to wait for the RX path
767 * should it be using the interface and enqueuing
768 * frames at this very time on another CPU.
769 */
770 synchronize_rcu();
771 skb_queue_purge(&sdata->skb_queue);
772
773 /*
774 * Disable beaconing here for mesh only, AP and IBSS
775 * are already taken care of.
776 */
777 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
778 ieee80211_bss_info_change_notify(sdata,
779 BSS_CHANGED_BEACON_ENABLED);
780
781 /*
782 * Free all remaining keys, there shouldn't be any,
783 * except maybe group keys in AP more or WDS?
784 */
785 ieee80211_free_keys(sdata);
786
787 if (going_down)
788 drv_remove_interface(local, sdata);
789 }
790
791 sdata->bss = NULL;
792
793 mutex_lock(&local->mtx);
794 hw_reconf_flags |= __ieee80211_recalc_idle(local);
795 mutex_unlock(&local->mtx);
796
797 ieee80211_recalc_ps(local, -1);
798
799 if (local->open_count == 0) {
800 if (local->ops->napi_poll)
801 napi_disable(&local->napi);
802 ieee80211_clear_tx_pending(local);
803 ieee80211_stop_device(local);
804
805 /* no reconfiguring after stop! */
806 hw_reconf_flags = 0;
807 }
808
809 /* Re-calculate channel-type, in case there are multiple vifs
810 * on different channel types.
811 */
812 orig_ct = local->_oper_channel_type;
813 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
814
815 /* do after stop to avoid reconfiguring when we stop anyway */
816 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
817 ieee80211_hw_config(local, hw_reconf_flags);
818
819 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
820 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
821 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
822 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
823 if (info->control.vif == &sdata->vif) {
824 __skb_unlink(skb, &local->pending[i]);
825 dev_kfree_skb_irq(skb);
826 }
827 }
828 }
829 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
830
831 if (local->monitors == local->open_count && local->monitors > 0)
832 ieee80211_add_virtual_monitor(local);
833 }
834
835 static int ieee80211_stop(struct net_device *dev)
836 {
837 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
838
839 ieee80211_do_stop(sdata, true);
840
841 return 0;
842 }
843
844 static void ieee80211_set_multicast_list(struct net_device *dev)
845 {
846 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
847 struct ieee80211_local *local = sdata->local;
848 int allmulti, promisc, sdata_allmulti, sdata_promisc;
849
850 allmulti = !!(dev->flags & IFF_ALLMULTI);
851 promisc = !!(dev->flags & IFF_PROMISC);
852 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
853 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
854
855 if (allmulti != sdata_allmulti) {
856 if (dev->flags & IFF_ALLMULTI)
857 atomic_inc(&local->iff_allmultis);
858 else
859 atomic_dec(&local->iff_allmultis);
860 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
861 }
862
863 if (promisc != sdata_promisc) {
864 if (dev->flags & IFF_PROMISC)
865 atomic_inc(&local->iff_promiscs);
866 else
867 atomic_dec(&local->iff_promiscs);
868 sdata->flags ^= IEEE80211_SDATA_PROMISC;
869 }
870 spin_lock_bh(&local->filter_lock);
871 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
872 spin_unlock_bh(&local->filter_lock);
873 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
874 }
875
876 /*
877 * Called when the netdev is removed or, by the code below, before
878 * the interface type changes.
879 */
880 static void ieee80211_teardown_sdata(struct net_device *dev)
881 {
882 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
883 struct ieee80211_local *local = sdata->local;
884 int flushed;
885 int i;
886
887 /* free extra data */
888 ieee80211_free_keys(sdata);
889
890 ieee80211_debugfs_remove_netdev(sdata);
891
892 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
893 __skb_queue_purge(&sdata->fragments[i].skb_list);
894 sdata->fragment_next = 0;
895
896 if (ieee80211_vif_is_mesh(&sdata->vif))
897 mesh_rmc_free(sdata);
898
899 flushed = sta_info_flush(local, sdata);
900 WARN_ON(flushed);
901 }
902
903 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
904 struct sk_buff *skb)
905 {
906 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
907 }
908
909 static const struct net_device_ops ieee80211_dataif_ops = {
910 .ndo_open = ieee80211_open,
911 .ndo_stop = ieee80211_stop,
912 .ndo_uninit = ieee80211_teardown_sdata,
913 .ndo_start_xmit = ieee80211_subif_start_xmit,
914 .ndo_set_rx_mode = ieee80211_set_multicast_list,
915 .ndo_change_mtu = ieee80211_change_mtu,
916 .ndo_set_mac_address = ieee80211_change_mac,
917 .ndo_select_queue = ieee80211_netdev_select_queue,
918 };
919
920 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
921 struct sk_buff *skb)
922 {
923 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
924 struct ieee80211_local *local = sdata->local;
925 struct ieee80211_hdr *hdr;
926 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
927
928 if (local->hw.queues < IEEE80211_NUM_ACS)
929 return 0;
930
931 if (skb->len < 4 ||
932 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
933 return 0; /* doesn't matter, frame will be dropped */
934
935 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
936
937 return ieee80211_select_queue_80211(sdata, skb, hdr);
938 }
939
940 static const struct net_device_ops ieee80211_monitorif_ops = {
941 .ndo_open = ieee80211_open,
942 .ndo_stop = ieee80211_stop,
943 .ndo_uninit = ieee80211_teardown_sdata,
944 .ndo_start_xmit = ieee80211_monitor_start_xmit,
945 .ndo_set_rx_mode = ieee80211_set_multicast_list,
946 .ndo_change_mtu = ieee80211_change_mtu,
947 .ndo_set_mac_address = eth_mac_addr,
948 .ndo_select_queue = ieee80211_monitor_select_queue,
949 };
950
951 static void ieee80211_if_setup(struct net_device *dev)
952 {
953 ether_setup(dev);
954 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
955 dev->netdev_ops = &ieee80211_dataif_ops;
956 dev->destructor = free_netdev;
957 }
958
959 static void ieee80211_iface_work(struct work_struct *work)
960 {
961 struct ieee80211_sub_if_data *sdata =
962 container_of(work, struct ieee80211_sub_if_data, work);
963 struct ieee80211_local *local = sdata->local;
964 struct sk_buff *skb;
965 struct sta_info *sta;
966 struct ieee80211_ra_tid *ra_tid;
967
968 if (!ieee80211_sdata_running(sdata))
969 return;
970
971 if (local->scanning)
972 return;
973
974 /*
975 * ieee80211_queue_work() should have picked up most cases,
976 * here we'll pick the rest.
977 */
978 if (WARN(local->suspended,
979 "interface work scheduled while going to suspend\n"))
980 return;
981
982 /* first process frames */
983 while ((skb = skb_dequeue(&sdata->skb_queue))) {
984 struct ieee80211_mgmt *mgmt = (void *)skb->data;
985
986 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
987 ra_tid = (void *)&skb->cb;
988 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
989 ra_tid->tid);
990 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
991 ra_tid = (void *)&skb->cb;
992 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
993 ra_tid->tid);
994 } else if (ieee80211_is_action(mgmt->frame_control) &&
995 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
996 int len = skb->len;
997
998 mutex_lock(&local->sta_mtx);
999 sta = sta_info_get_bss(sdata, mgmt->sa);
1000 if (sta) {
1001 switch (mgmt->u.action.u.addba_req.action_code) {
1002 case WLAN_ACTION_ADDBA_REQ:
1003 ieee80211_process_addba_request(
1004 local, sta, mgmt, len);
1005 break;
1006 case WLAN_ACTION_ADDBA_RESP:
1007 ieee80211_process_addba_resp(local, sta,
1008 mgmt, len);
1009 break;
1010 case WLAN_ACTION_DELBA:
1011 ieee80211_process_delba(sdata, sta,
1012 mgmt, len);
1013 break;
1014 default:
1015 WARN_ON(1);
1016 break;
1017 }
1018 }
1019 mutex_unlock(&local->sta_mtx);
1020 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1021 struct ieee80211_hdr *hdr = (void *)mgmt;
1022 /*
1023 * So the frame isn't mgmt, but frame_control
1024 * is at the right place anyway, of course, so
1025 * the if statement is correct.
1026 *
1027 * Warn if we have other data frame types here,
1028 * they must not get here.
1029 */
1030 WARN_ON(hdr->frame_control &
1031 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1032 WARN_ON(!(hdr->seq_ctrl &
1033 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1034 /*
1035 * This was a fragment of a frame, received while
1036 * a block-ack session was active. That cannot be
1037 * right, so terminate the session.
1038 */
1039 mutex_lock(&local->sta_mtx);
1040 sta = sta_info_get_bss(sdata, mgmt->sa);
1041 if (sta) {
1042 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1043 IEEE80211_QOS_CTL_TID_MASK;
1044
1045 __ieee80211_stop_rx_ba_session(
1046 sta, tid, WLAN_BACK_RECIPIENT,
1047 WLAN_REASON_QSTA_REQUIRE_SETUP,
1048 true);
1049 }
1050 mutex_unlock(&local->sta_mtx);
1051 } else switch (sdata->vif.type) {
1052 case NL80211_IFTYPE_STATION:
1053 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1054 break;
1055 case NL80211_IFTYPE_ADHOC:
1056 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1057 break;
1058 case NL80211_IFTYPE_MESH_POINT:
1059 if (!ieee80211_vif_is_mesh(&sdata->vif))
1060 break;
1061 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1062 break;
1063 default:
1064 WARN(1, "frame for unexpected interface type");
1065 break;
1066 }
1067
1068 kfree_skb(skb);
1069 }
1070
1071 /* then other type-dependent work */
1072 switch (sdata->vif.type) {
1073 case NL80211_IFTYPE_STATION:
1074 ieee80211_sta_work(sdata);
1075 break;
1076 case NL80211_IFTYPE_ADHOC:
1077 ieee80211_ibss_work(sdata);
1078 break;
1079 case NL80211_IFTYPE_MESH_POINT:
1080 if (!ieee80211_vif_is_mesh(&sdata->vif))
1081 break;
1082 ieee80211_mesh_work(sdata);
1083 break;
1084 default:
1085 break;
1086 }
1087 }
1088
1089
1090 /*
1091 * Helper function to initialise an interface to a specific type.
1092 */
1093 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1094 enum nl80211_iftype type)
1095 {
1096 /* clear type-dependent union */
1097 memset(&sdata->u, 0, sizeof(sdata->u));
1098
1099 /* and set some type-dependent values */
1100 sdata->vif.type = type;
1101 sdata->vif.p2p = false;
1102 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1103 sdata->wdev.iftype = type;
1104
1105 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1106 sdata->control_port_no_encrypt = false;
1107
1108 sdata->noack_map = 0;
1109
1110 /* only monitor differs */
1111 sdata->dev->type = ARPHRD_ETHER;
1112
1113 skb_queue_head_init(&sdata->skb_queue);
1114 INIT_WORK(&sdata->work, ieee80211_iface_work);
1115
1116 switch (type) {
1117 case NL80211_IFTYPE_P2P_GO:
1118 type = NL80211_IFTYPE_AP;
1119 sdata->vif.type = type;
1120 sdata->vif.p2p = true;
1121 /* fall through */
1122 case NL80211_IFTYPE_AP:
1123 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1124 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1125 break;
1126 case NL80211_IFTYPE_P2P_CLIENT:
1127 type = NL80211_IFTYPE_STATION;
1128 sdata->vif.type = type;
1129 sdata->vif.p2p = true;
1130 /* fall through */
1131 case NL80211_IFTYPE_STATION:
1132 ieee80211_sta_setup_sdata(sdata);
1133 break;
1134 case NL80211_IFTYPE_ADHOC:
1135 ieee80211_ibss_setup_sdata(sdata);
1136 break;
1137 case NL80211_IFTYPE_MESH_POINT:
1138 if (ieee80211_vif_is_mesh(&sdata->vif))
1139 ieee80211_mesh_init_sdata(sdata);
1140 break;
1141 case NL80211_IFTYPE_MONITOR:
1142 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1143 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1144 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1145 MONITOR_FLAG_OTHER_BSS;
1146 break;
1147 case NL80211_IFTYPE_WDS:
1148 case NL80211_IFTYPE_AP_VLAN:
1149 break;
1150 case NL80211_IFTYPE_UNSPECIFIED:
1151 case NUM_NL80211_IFTYPES:
1152 BUG();
1153 break;
1154 }
1155
1156 ieee80211_debugfs_add_netdev(sdata);
1157 }
1158
1159 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1160 {
1161 switch (sdata->vif.type) {
1162 case NL80211_IFTYPE_MESH_POINT:
1163 mesh_path_flush_by_iface(sdata);
1164 break;
1165
1166 default:
1167 break;
1168 }
1169 }
1170
1171 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1172 enum nl80211_iftype type)
1173 {
1174 struct ieee80211_local *local = sdata->local;
1175 int ret, err;
1176 enum nl80211_iftype internal_type = type;
1177 bool p2p = false;
1178
1179 ASSERT_RTNL();
1180
1181 if (!local->ops->change_interface)
1182 return -EBUSY;
1183
1184 switch (sdata->vif.type) {
1185 case NL80211_IFTYPE_AP:
1186 case NL80211_IFTYPE_STATION:
1187 case NL80211_IFTYPE_ADHOC:
1188 /*
1189 * Could maybe also all others here?
1190 * Just not sure how that interacts
1191 * with the RX/config path e.g. for
1192 * mesh.
1193 */
1194 break;
1195 default:
1196 return -EBUSY;
1197 }
1198
1199 switch (type) {
1200 case NL80211_IFTYPE_AP:
1201 case NL80211_IFTYPE_STATION:
1202 case NL80211_IFTYPE_ADHOC:
1203 /*
1204 * Could probably support everything
1205 * but WDS here (WDS do_open can fail
1206 * under memory pressure, which this
1207 * code isn't prepared to handle).
1208 */
1209 break;
1210 case NL80211_IFTYPE_P2P_CLIENT:
1211 p2p = true;
1212 internal_type = NL80211_IFTYPE_STATION;
1213 break;
1214 case NL80211_IFTYPE_P2P_GO:
1215 p2p = true;
1216 internal_type = NL80211_IFTYPE_AP;
1217 break;
1218 default:
1219 return -EBUSY;
1220 }
1221
1222 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1223 if (ret)
1224 return ret;
1225
1226 ieee80211_do_stop(sdata, false);
1227
1228 ieee80211_teardown_sdata(sdata->dev);
1229
1230 ret = drv_change_interface(local, sdata, internal_type, p2p);
1231 if (ret)
1232 type = sdata->vif.type;
1233
1234 /*
1235 * Ignore return value here, there's not much we can do since
1236 * the driver changed the interface type internally already.
1237 * The warnings will hopefully make driver authors fix it :-)
1238 */
1239 ieee80211_check_queues(sdata);
1240
1241 ieee80211_setup_sdata(sdata, type);
1242
1243 err = ieee80211_do_open(sdata->dev, false);
1244 WARN(err, "type change: do_open returned %d", err);
1245
1246 return ret;
1247 }
1248
1249 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1250 enum nl80211_iftype type)
1251 {
1252 int ret;
1253
1254 ASSERT_RTNL();
1255
1256 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1257 return 0;
1258
1259 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1260 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1261 type == NL80211_IFTYPE_ADHOC)
1262 return -EOPNOTSUPP;
1263
1264 if (ieee80211_sdata_running(sdata)) {
1265 ret = ieee80211_runtime_change_iftype(sdata, type);
1266 if (ret)
1267 return ret;
1268 } else {
1269 /* Purge and reset type-dependent state. */
1270 ieee80211_teardown_sdata(sdata->dev);
1271 ieee80211_setup_sdata(sdata, type);
1272 }
1273
1274 /* reset some values that shouldn't be kept across type changes */
1275 sdata->vif.bss_conf.basic_rates =
1276 ieee80211_mandatory_rates(sdata->local,
1277 sdata->local->hw.conf.channel->band);
1278 sdata->drop_unencrypted = 0;
1279 if (type == NL80211_IFTYPE_STATION)
1280 sdata->u.mgd.use_4addr = false;
1281
1282 return 0;
1283 }
1284
1285 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1286 struct net_device *dev,
1287 enum nl80211_iftype type)
1288 {
1289 struct ieee80211_sub_if_data *sdata;
1290 u64 mask, start, addr, val, inc;
1291 u8 *m;
1292 u8 tmp_addr[ETH_ALEN];
1293 int i;
1294
1295 /* default ... something at least */
1296 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1297
1298 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1299 local->hw.wiphy->n_addresses <= 1)
1300 return;
1301
1302
1303 mutex_lock(&local->iflist_mtx);
1304
1305 switch (type) {
1306 case NL80211_IFTYPE_MONITOR:
1307 /* doesn't matter */
1308 break;
1309 case NL80211_IFTYPE_WDS:
1310 case NL80211_IFTYPE_AP_VLAN:
1311 /* match up with an AP interface */
1312 list_for_each_entry(sdata, &local->interfaces, list) {
1313 if (sdata->vif.type != NL80211_IFTYPE_AP)
1314 continue;
1315 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1316 break;
1317 }
1318 /* keep default if no AP interface present */
1319 break;
1320 default:
1321 /* assign a new address if possible -- try n_addresses first */
1322 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1323 bool used = false;
1324
1325 list_for_each_entry(sdata, &local->interfaces, list) {
1326 if (memcmp(local->hw.wiphy->addresses[i].addr,
1327 sdata->vif.addr, ETH_ALEN) == 0) {
1328 used = true;
1329 break;
1330 }
1331 }
1332
1333 if (!used) {
1334 memcpy(dev->perm_addr,
1335 local->hw.wiphy->addresses[i].addr,
1336 ETH_ALEN);
1337 break;
1338 }
1339 }
1340
1341 /* try mask if available */
1342 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1343 break;
1344
1345 m = local->hw.wiphy->addr_mask;
1346 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1347 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1348 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1349
1350 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1351 /* not a contiguous mask ... not handled now! */
1352 pr_info("not contiguous\n");
1353 break;
1354 }
1355
1356 m = local->hw.wiphy->perm_addr;
1357 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1358 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1359 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1360
1361 inc = 1ULL<<__ffs64(mask);
1362 val = (start & mask);
1363 addr = (start & ~mask) | (val & mask);
1364 do {
1365 bool used = false;
1366
1367 tmp_addr[5] = addr >> 0*8;
1368 tmp_addr[4] = addr >> 1*8;
1369 tmp_addr[3] = addr >> 2*8;
1370 tmp_addr[2] = addr >> 3*8;
1371 tmp_addr[1] = addr >> 4*8;
1372 tmp_addr[0] = addr >> 5*8;
1373
1374 val += inc;
1375
1376 list_for_each_entry(sdata, &local->interfaces, list) {
1377 if (memcmp(tmp_addr, sdata->vif.addr,
1378 ETH_ALEN) == 0) {
1379 used = true;
1380 break;
1381 }
1382 }
1383
1384 if (!used) {
1385 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1386 break;
1387 }
1388 addr = (start & ~mask) | (val & mask);
1389 } while (addr != start);
1390
1391 break;
1392 }
1393
1394 mutex_unlock(&local->iflist_mtx);
1395 }
1396
1397 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1398 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1399 struct vif_params *params)
1400 {
1401 struct net_device *ndev;
1402 struct ieee80211_sub_if_data *sdata = NULL;
1403 int ret, i;
1404 int txqs = 1;
1405
1406 ASSERT_RTNL();
1407
1408 if (local->hw.queues >= IEEE80211_NUM_ACS)
1409 txqs = IEEE80211_NUM_ACS;
1410
1411 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1412 name, ieee80211_if_setup, txqs, 1);
1413 if (!ndev)
1414 return -ENOMEM;
1415 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1416
1417 ndev->needed_headroom = local->tx_headroom +
1418 4*6 /* four MAC addresses */
1419 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1420 + 6 /* mesh */
1421 + 8 /* rfc1042/bridge tunnel */
1422 - ETH_HLEN /* ethernet hard_header_len */
1423 + IEEE80211_ENCRYPT_HEADROOM;
1424 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1425
1426 ret = dev_alloc_name(ndev, ndev->name);
1427 if (ret < 0)
1428 goto fail;
1429
1430 ieee80211_assign_perm_addr(local, ndev, type);
1431 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1432 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1433
1434 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1435 sdata = netdev_priv(ndev);
1436 ndev->ieee80211_ptr = &sdata->wdev;
1437 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1438 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1439
1440 /* initialise type-independent data */
1441 sdata->wdev.wiphy = local->hw.wiphy;
1442 sdata->local = local;
1443 sdata->dev = ndev;
1444 #ifdef CONFIG_INET
1445 sdata->arp_filter_state = true;
1446 #endif
1447
1448 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1449 skb_queue_head_init(&sdata->fragments[i].skb_list);
1450
1451 INIT_LIST_HEAD(&sdata->key_list);
1452
1453 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1454 struct ieee80211_supported_band *sband;
1455 sband = local->hw.wiphy->bands[i];
1456 sdata->rc_rateidx_mask[i] =
1457 sband ? (1 << sband->n_bitrates) - 1 : 0;
1458 if (sband)
1459 memcpy(sdata->rc_rateidx_mcs_mask[i],
1460 sband->ht_cap.mcs.rx_mask,
1461 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1462 else
1463 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1464 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1465 }
1466
1467 ieee80211_set_default_queues(sdata);
1468
1469 /* setup type-dependent data */
1470 ieee80211_setup_sdata(sdata, type);
1471
1472 if (params) {
1473 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1474 if (type == NL80211_IFTYPE_STATION)
1475 sdata->u.mgd.use_4addr = params->use_4addr;
1476 }
1477
1478 ndev->features |= local->hw.netdev_features;
1479
1480 ret = register_netdevice(ndev);
1481 if (ret)
1482 goto fail;
1483
1484 mutex_lock(&local->iflist_mtx);
1485 list_add_tail_rcu(&sdata->list, &local->interfaces);
1486 mutex_unlock(&local->iflist_mtx);
1487
1488 if (new_wdev)
1489 *new_wdev = &sdata->wdev;
1490
1491 return 0;
1492
1493 fail:
1494 free_netdev(ndev);
1495 return ret;
1496 }
1497
1498 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1499 {
1500 ASSERT_RTNL();
1501
1502 mutex_lock(&sdata->local->iflist_mtx);
1503 list_del_rcu(&sdata->list);
1504 mutex_unlock(&sdata->local->iflist_mtx);
1505
1506 /* clean up type-dependent data */
1507 ieee80211_clean_sdata(sdata);
1508
1509 synchronize_rcu();
1510 unregister_netdevice(sdata->dev);
1511 }
1512
1513 /*
1514 * Remove all interfaces, may only be called at hardware unregistration
1515 * time because it doesn't do RCU-safe list removals.
1516 */
1517 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1518 {
1519 struct ieee80211_sub_if_data *sdata, *tmp;
1520 LIST_HEAD(unreg_list);
1521
1522 ASSERT_RTNL();
1523
1524 mutex_lock(&local->iflist_mtx);
1525 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1526 list_del(&sdata->list);
1527
1528 ieee80211_clean_sdata(sdata);
1529
1530 unregister_netdevice_queue(sdata->dev, &unreg_list);
1531 }
1532 mutex_unlock(&local->iflist_mtx);
1533 unregister_netdevice_many(&unreg_list);
1534 list_del(&unreg_list);
1535 }
1536
1537 static int netdev_notify(struct notifier_block *nb,
1538 unsigned long state,
1539 void *ndev)
1540 {
1541 struct net_device *dev = ndev;
1542 struct ieee80211_sub_if_data *sdata;
1543
1544 if (state != NETDEV_CHANGENAME)
1545 return 0;
1546
1547 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1548 return 0;
1549
1550 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1551 return 0;
1552
1553 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1554
1555 memcpy(sdata->name, dev->name, IFNAMSIZ);
1556
1557 ieee80211_debugfs_rename_netdev(sdata);
1558 return 0;
1559 }
1560
1561 static struct notifier_block mac80211_netdev_notifier = {
1562 .notifier_call = netdev_notify,
1563 };
1564
1565 int ieee80211_iface_init(void)
1566 {
1567 return register_netdevice_notifier(&mac80211_netdev_notifier);
1568 }
1569
1570 void ieee80211_iface_exit(void)
1571 {
1572 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1573 }
Linux with added FPC-III support