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mac80211: remove ieee80211_clean_sdata()
[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 /* 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 switch (sdata->vif.type) {
543 case NL80211_IFTYPE_STATION:
544 case NL80211_IFTYPE_ADHOC:
545 case NL80211_IFTYPE_AP:
546 case NL80211_IFTYPE_MESH_POINT:
547 netif_carrier_off(dev);
548 break;
549 case NL80211_IFTYPE_WDS:
550 break;
551 default:
552 netif_carrier_on(dev);
553 }
554
555 /*
556 * set default queue parameters so drivers don't
557 * need to initialise the hardware if the hardware
558 * doesn't start up with sane defaults
559 */
560 ieee80211_set_wmm_default(sdata, true);
561 }
562
563 set_bit(SDATA_STATE_RUNNING, &sdata->state);
564
565 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
566 /* Create STA entry for the WDS peer */
567 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
568 GFP_KERNEL);
569 if (!sta) {
570 res = -ENOMEM;
571 goto err_del_interface;
572 }
573
574 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
575 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
576 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
577
578 res = sta_info_insert(sta);
579 if (res) {
580 /* STA has been freed */
581 goto err_del_interface;
582 }
583
584 rate_control_rate_init(sta);
585 netif_carrier_on(dev);
586 }
587
588 /*
589 * set_multicast_list will be invoked by the networking core
590 * which will check whether any increments here were done in
591 * error and sync them down to the hardware as filter flags.
592 */
593 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
594 atomic_inc(&local->iff_allmultis);
595
596 if (sdata->flags & IEEE80211_SDATA_PROMISC)
597 atomic_inc(&local->iff_promiscs);
598
599 mutex_lock(&local->mtx);
600 hw_reconf_flags |= __ieee80211_recalc_idle(local);
601 mutex_unlock(&local->mtx);
602
603 if (coming_up)
604 local->open_count++;
605
606 if (hw_reconf_flags)
607 ieee80211_hw_config(local, hw_reconf_flags);
608
609 ieee80211_recalc_ps(local, -1);
610
611 netif_tx_start_all_queues(dev);
612
613 return 0;
614 err_del_interface:
615 drv_remove_interface(local, sdata);
616 err_stop:
617 if (!local->open_count)
618 drv_stop(local);
619 err_del_bss:
620 sdata->bss = NULL;
621 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
622 list_del(&sdata->u.vlan.list);
623 /* might already be clear but that doesn't matter */
624 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
625 return res;
626 }
627
628 static int ieee80211_open(struct net_device *dev)
629 {
630 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
631 int err;
632
633 /* fail early if user set an invalid address */
634 if (!is_valid_ether_addr(dev->dev_addr))
635 return -EADDRNOTAVAIL;
636
637 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
638 if (err)
639 return err;
640
641 return ieee80211_do_open(dev, true);
642 }
643
644 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
645 bool going_down)
646 {
647 struct ieee80211_local *local = sdata->local;
648 unsigned long flags;
649 struct sk_buff *skb, *tmp;
650 u32 hw_reconf_flags = 0;
651 int i;
652 enum nl80211_channel_type orig_ct;
653
654 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
655
656 if (rcu_access_pointer(local->scan_sdata) == sdata)
657 ieee80211_scan_cancel(local);
658
659 /*
660 * Stop TX on this interface first.
661 */
662 netif_tx_stop_all_queues(sdata->dev);
663
664 ieee80211_roc_purge(sdata);
665
666 /*
667 * Remove all stations associated with this interface.
668 *
669 * This must be done before calling ops->remove_interface()
670 * because otherwise we can later invoke ops->sta_notify()
671 * whenever the STAs are removed, and that invalidates driver
672 * assumptions about always getting a vif pointer that is valid
673 * (because if we remove a STA after ops->remove_interface()
674 * the driver will have removed the vif info already!)
675 *
676 * This is relevant only in AP, WDS and mesh modes, since in
677 * all other modes we've already removed all stations when
678 * disconnecting etc.
679 */
680 sta_info_flush(local, sdata);
681
682 /*
683 * Don't count this interface for promisc/allmulti while it
684 * is down. dev_mc_unsync() will invoke set_multicast_list
685 * on the master interface which will sync these down to the
686 * hardware as filter flags.
687 */
688 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
689 atomic_dec(&local->iff_allmultis);
690
691 if (sdata->flags & IEEE80211_SDATA_PROMISC)
692 atomic_dec(&local->iff_promiscs);
693
694 if (sdata->vif.type == NL80211_IFTYPE_AP) {
695 local->fif_pspoll--;
696 local->fif_probe_req--;
697 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
698 local->fif_probe_req--;
699 }
700
701 netif_addr_lock_bh(sdata->dev);
702 spin_lock_bh(&local->filter_lock);
703 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
704 sdata->dev->addr_len);
705 spin_unlock_bh(&local->filter_lock);
706 netif_addr_unlock_bh(sdata->dev);
707
708 ieee80211_configure_filter(local);
709
710 del_timer_sync(&local->dynamic_ps_timer);
711 cancel_work_sync(&local->dynamic_ps_enable_work);
712
713 /* APs need special treatment */
714 if (sdata->vif.type == NL80211_IFTYPE_AP) {
715 struct ieee80211_sub_if_data *vlan, *tmpsdata;
716 struct beacon_data *old_beacon =
717 rtnl_dereference(sdata->u.ap.beacon);
718 struct sk_buff *old_probe_resp =
719 rtnl_dereference(sdata->u.ap.probe_resp);
720
721 /* sdata_running will return false, so this will disable */
722 ieee80211_bss_info_change_notify(sdata,
723 BSS_CHANGED_BEACON_ENABLED);
724
725 /* remove beacon and probe response */
726 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
727 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
728 synchronize_rcu();
729 kfree(old_beacon);
730 kfree_skb(old_probe_resp);
731
732 /* down all dependent devices, that is VLANs */
733 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
734 u.vlan.list)
735 dev_close(vlan->dev);
736 WARN_ON(!list_empty(&sdata->u.ap.vlans));
737
738 /* free all potentially still buffered bcast frames */
739 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
740 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
741 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
742 ieee80211_mgd_stop(sdata);
743 }
744
745 if (going_down)
746 local->open_count--;
747
748 switch (sdata->vif.type) {
749 case NL80211_IFTYPE_AP_VLAN:
750 list_del(&sdata->u.vlan.list);
751 /* no need to tell driver */
752 break;
753 case NL80211_IFTYPE_MONITOR:
754 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
755 local->cooked_mntrs--;
756 break;
757 }
758
759 local->monitors--;
760 if (local->monitors == 0) {
761 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
762 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
763 ieee80211_del_virtual_monitor(local);
764 }
765
766 ieee80211_adjust_monitor_flags(sdata, -1);
767 ieee80211_configure_filter(local);
768 break;
769 default:
770 flush_work(&sdata->work);
771 /*
772 * When we get here, the interface is marked down.
773 * Call synchronize_rcu() to wait for the RX path
774 * should it be using the interface and enqueuing
775 * frames at this very time on another CPU.
776 */
777 synchronize_rcu();
778 skb_queue_purge(&sdata->skb_queue);
779
780 /*
781 * Free all remaining keys, there shouldn't be any,
782 * except maybe group keys in AP more or WDS?
783 */
784 ieee80211_free_keys(sdata);
785
786 if (going_down)
787 drv_remove_interface(local, sdata);
788 }
789
790 sdata->bss = NULL;
791
792 mutex_lock(&local->mtx);
793 hw_reconf_flags |= __ieee80211_recalc_idle(local);
794 mutex_unlock(&local->mtx);
795
796 ieee80211_recalc_ps(local, -1);
797
798 if (local->open_count == 0) {
799 if (local->ops->napi_poll)
800 napi_disable(&local->napi);
801 ieee80211_clear_tx_pending(local);
802 ieee80211_stop_device(local);
803
804 /* no reconfiguring after stop! */
805 hw_reconf_flags = 0;
806 }
807
808 /* Re-calculate channel-type, in case there are multiple vifs
809 * on different channel types.
810 */
811 orig_ct = local->_oper_channel_type;
812 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
813
814 /* do after stop to avoid reconfiguring when we stop anyway */
815 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
816 ieee80211_hw_config(local, hw_reconf_flags);
817
818 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
819 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
820 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
821 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
822 if (info->control.vif == &sdata->vif) {
823 __skb_unlink(skb, &local->pending[i]);
824 dev_kfree_skb_irq(skb);
825 }
826 }
827 }
828 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
829
830 if (local->monitors == local->open_count && local->monitors > 0)
831 ieee80211_add_virtual_monitor(local);
832 }
833
834 static int ieee80211_stop(struct net_device *dev)
835 {
836 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
837
838 ieee80211_do_stop(sdata, true);
839
840 return 0;
841 }
842
843 static void ieee80211_set_multicast_list(struct net_device *dev)
844 {
845 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
846 struct ieee80211_local *local = sdata->local;
847 int allmulti, promisc, sdata_allmulti, sdata_promisc;
848
849 allmulti = !!(dev->flags & IFF_ALLMULTI);
850 promisc = !!(dev->flags & IFF_PROMISC);
851 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
852 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
853
854 if (allmulti != sdata_allmulti) {
855 if (dev->flags & IFF_ALLMULTI)
856 atomic_inc(&local->iff_allmultis);
857 else
858 atomic_dec(&local->iff_allmultis);
859 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
860 }
861
862 if (promisc != sdata_promisc) {
863 if (dev->flags & IFF_PROMISC)
864 atomic_inc(&local->iff_promiscs);
865 else
866 atomic_dec(&local->iff_promiscs);
867 sdata->flags ^= IEEE80211_SDATA_PROMISC;
868 }
869 spin_lock_bh(&local->filter_lock);
870 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
871 spin_unlock_bh(&local->filter_lock);
872 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
873 }
874
875 /*
876 * Called when the netdev is removed or, by the code below, before
877 * the interface type changes.
878 */
879 static void ieee80211_teardown_sdata(struct net_device *dev)
880 {
881 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
882 struct ieee80211_local *local = sdata->local;
883 int flushed;
884 int i;
885
886 /* free extra data */
887 ieee80211_free_keys(sdata);
888
889 ieee80211_debugfs_remove_netdev(sdata);
890
891 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
892 __skb_queue_purge(&sdata->fragments[i].skb_list);
893 sdata->fragment_next = 0;
894
895 if (ieee80211_vif_is_mesh(&sdata->vif))
896 mesh_rmc_free(sdata);
897
898 flushed = sta_info_flush(local, sdata);
899 WARN_ON(flushed);
900 }
901
902 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
903 struct sk_buff *skb)
904 {
905 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
906 }
907
908 static const struct net_device_ops ieee80211_dataif_ops = {
909 .ndo_open = ieee80211_open,
910 .ndo_stop = ieee80211_stop,
911 .ndo_uninit = ieee80211_teardown_sdata,
912 .ndo_start_xmit = ieee80211_subif_start_xmit,
913 .ndo_set_rx_mode = ieee80211_set_multicast_list,
914 .ndo_change_mtu = ieee80211_change_mtu,
915 .ndo_set_mac_address = ieee80211_change_mac,
916 .ndo_select_queue = ieee80211_netdev_select_queue,
917 };
918
919 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
920 struct sk_buff *skb)
921 {
922 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
923 struct ieee80211_local *local = sdata->local;
924 struct ieee80211_hdr *hdr;
925 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
926
927 if (local->hw.queues < IEEE80211_NUM_ACS)
928 return 0;
929
930 if (skb->len < 4 ||
931 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
932 return 0; /* doesn't matter, frame will be dropped */
933
934 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
935
936 return ieee80211_select_queue_80211(sdata, skb, hdr);
937 }
938
939 static const struct net_device_ops ieee80211_monitorif_ops = {
940 .ndo_open = ieee80211_open,
941 .ndo_stop = ieee80211_stop,
942 .ndo_uninit = ieee80211_teardown_sdata,
943 .ndo_start_xmit = ieee80211_monitor_start_xmit,
944 .ndo_set_rx_mode = ieee80211_set_multicast_list,
945 .ndo_change_mtu = ieee80211_change_mtu,
946 .ndo_set_mac_address = eth_mac_addr,
947 .ndo_select_queue = ieee80211_monitor_select_queue,
948 };
949
950 static void ieee80211_if_setup(struct net_device *dev)
951 {
952 ether_setup(dev);
953 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
954 dev->netdev_ops = &ieee80211_dataif_ops;
955 dev->destructor = free_netdev;
956 }
957
958 static void ieee80211_iface_work(struct work_struct *work)
959 {
960 struct ieee80211_sub_if_data *sdata =
961 container_of(work, struct ieee80211_sub_if_data, work);
962 struct ieee80211_local *local = sdata->local;
963 struct sk_buff *skb;
964 struct sta_info *sta;
965 struct ieee80211_ra_tid *ra_tid;
966
967 if (!ieee80211_sdata_running(sdata))
968 return;
969
970 if (local->scanning)
971 return;
972
973 /*
974 * ieee80211_queue_work() should have picked up most cases,
975 * here we'll pick the rest.
976 */
977 if (WARN(local->suspended,
978 "interface work scheduled while going to suspend\n"))
979 return;
980
981 /* first process frames */
982 while ((skb = skb_dequeue(&sdata->skb_queue))) {
983 struct ieee80211_mgmt *mgmt = (void *)skb->data;
984
985 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
986 ra_tid = (void *)&skb->cb;
987 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
988 ra_tid->tid);
989 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
990 ra_tid = (void *)&skb->cb;
991 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
992 ra_tid->tid);
993 } else if (ieee80211_is_action(mgmt->frame_control) &&
994 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
995 int len = skb->len;
996
997 mutex_lock(&local->sta_mtx);
998 sta = sta_info_get_bss(sdata, mgmt->sa);
999 if (sta) {
1000 switch (mgmt->u.action.u.addba_req.action_code) {
1001 case WLAN_ACTION_ADDBA_REQ:
1002 ieee80211_process_addba_request(
1003 local, sta, mgmt, len);
1004 break;
1005 case WLAN_ACTION_ADDBA_RESP:
1006 ieee80211_process_addba_resp(local, sta,
1007 mgmt, len);
1008 break;
1009 case WLAN_ACTION_DELBA:
1010 ieee80211_process_delba(sdata, sta,
1011 mgmt, len);
1012 break;
1013 default:
1014 WARN_ON(1);
1015 break;
1016 }
1017 }
1018 mutex_unlock(&local->sta_mtx);
1019 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1020 struct ieee80211_hdr *hdr = (void *)mgmt;
1021 /*
1022 * So the frame isn't mgmt, but frame_control
1023 * is at the right place anyway, of course, so
1024 * the if statement is correct.
1025 *
1026 * Warn if we have other data frame types here,
1027 * they must not get here.
1028 */
1029 WARN_ON(hdr->frame_control &
1030 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1031 WARN_ON(!(hdr->seq_ctrl &
1032 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1033 /*
1034 * This was a fragment of a frame, received while
1035 * a block-ack session was active. That cannot be
1036 * right, so terminate the session.
1037 */
1038 mutex_lock(&local->sta_mtx);
1039 sta = sta_info_get_bss(sdata, mgmt->sa);
1040 if (sta) {
1041 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1042 IEEE80211_QOS_CTL_TID_MASK;
1043
1044 __ieee80211_stop_rx_ba_session(
1045 sta, tid, WLAN_BACK_RECIPIENT,
1046 WLAN_REASON_QSTA_REQUIRE_SETUP,
1047 true);
1048 }
1049 mutex_unlock(&local->sta_mtx);
1050 } else switch (sdata->vif.type) {
1051 case NL80211_IFTYPE_STATION:
1052 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1053 break;
1054 case NL80211_IFTYPE_ADHOC:
1055 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1056 break;
1057 case NL80211_IFTYPE_MESH_POINT:
1058 if (!ieee80211_vif_is_mesh(&sdata->vif))
1059 break;
1060 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1061 break;
1062 default:
1063 WARN(1, "frame for unexpected interface type");
1064 break;
1065 }
1066
1067 kfree_skb(skb);
1068 }
1069
1070 /* then other type-dependent work */
1071 switch (sdata->vif.type) {
1072 case NL80211_IFTYPE_STATION:
1073 ieee80211_sta_work(sdata);
1074 break;
1075 case NL80211_IFTYPE_ADHOC:
1076 ieee80211_ibss_work(sdata);
1077 break;
1078 case NL80211_IFTYPE_MESH_POINT:
1079 if (!ieee80211_vif_is_mesh(&sdata->vif))
1080 break;
1081 ieee80211_mesh_work(sdata);
1082 break;
1083 default:
1084 break;
1085 }
1086 }
1087
1088
1089 /*
1090 * Helper function to initialise an interface to a specific type.
1091 */
1092 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1093 enum nl80211_iftype type)
1094 {
1095 /* clear type-dependent union */
1096 memset(&sdata->u, 0, sizeof(sdata->u));
1097
1098 /* and set some type-dependent values */
1099 sdata->vif.type = type;
1100 sdata->vif.p2p = false;
1101 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1102 sdata->wdev.iftype = type;
1103
1104 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1105 sdata->control_port_no_encrypt = false;
1106
1107 sdata->noack_map = 0;
1108
1109 /* only monitor differs */
1110 sdata->dev->type = ARPHRD_ETHER;
1111
1112 skb_queue_head_init(&sdata->skb_queue);
1113 INIT_WORK(&sdata->work, ieee80211_iface_work);
1114
1115 switch (type) {
1116 case NL80211_IFTYPE_P2P_GO:
1117 type = NL80211_IFTYPE_AP;
1118 sdata->vif.type = type;
1119 sdata->vif.p2p = true;
1120 /* fall through */
1121 case NL80211_IFTYPE_AP:
1122 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1123 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1124 break;
1125 case NL80211_IFTYPE_P2P_CLIENT:
1126 type = NL80211_IFTYPE_STATION;
1127 sdata->vif.type = type;
1128 sdata->vif.p2p = true;
1129 /* fall through */
1130 case NL80211_IFTYPE_STATION:
1131 ieee80211_sta_setup_sdata(sdata);
1132 break;
1133 case NL80211_IFTYPE_ADHOC:
1134 ieee80211_ibss_setup_sdata(sdata);
1135 break;
1136 case NL80211_IFTYPE_MESH_POINT:
1137 if (ieee80211_vif_is_mesh(&sdata->vif))
1138 ieee80211_mesh_init_sdata(sdata);
1139 break;
1140 case NL80211_IFTYPE_MONITOR:
1141 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1142 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1143 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1144 MONITOR_FLAG_OTHER_BSS;
1145 break;
1146 case NL80211_IFTYPE_WDS:
1147 case NL80211_IFTYPE_AP_VLAN:
1148 break;
1149 case NL80211_IFTYPE_UNSPECIFIED:
1150 case NUM_NL80211_IFTYPES:
1151 BUG();
1152 break;
1153 }
1154
1155 ieee80211_debugfs_add_netdev(sdata);
1156 }
1157
1158 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1159 enum nl80211_iftype type)
1160 {
1161 struct ieee80211_local *local = sdata->local;
1162 int ret, err;
1163 enum nl80211_iftype internal_type = type;
1164 bool p2p = false;
1165
1166 ASSERT_RTNL();
1167
1168 if (!local->ops->change_interface)
1169 return -EBUSY;
1170
1171 switch (sdata->vif.type) {
1172 case NL80211_IFTYPE_AP:
1173 case NL80211_IFTYPE_STATION:
1174 case NL80211_IFTYPE_ADHOC:
1175 /*
1176 * Could maybe also all others here?
1177 * Just not sure how that interacts
1178 * with the RX/config path e.g. for
1179 * mesh.
1180 */
1181 break;
1182 default:
1183 return -EBUSY;
1184 }
1185
1186 switch (type) {
1187 case NL80211_IFTYPE_AP:
1188 case NL80211_IFTYPE_STATION:
1189 case NL80211_IFTYPE_ADHOC:
1190 /*
1191 * Could probably support everything
1192 * but WDS here (WDS do_open can fail
1193 * under memory pressure, which this
1194 * code isn't prepared to handle).
1195 */
1196 break;
1197 case NL80211_IFTYPE_P2P_CLIENT:
1198 p2p = true;
1199 internal_type = NL80211_IFTYPE_STATION;
1200 break;
1201 case NL80211_IFTYPE_P2P_GO:
1202 p2p = true;
1203 internal_type = NL80211_IFTYPE_AP;
1204 break;
1205 default:
1206 return -EBUSY;
1207 }
1208
1209 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1210 if (ret)
1211 return ret;
1212
1213 ieee80211_do_stop(sdata, false);
1214
1215 ieee80211_teardown_sdata(sdata->dev);
1216
1217 ret = drv_change_interface(local, sdata, internal_type, p2p);
1218 if (ret)
1219 type = sdata->vif.type;
1220
1221 /*
1222 * Ignore return value here, there's not much we can do since
1223 * the driver changed the interface type internally already.
1224 * The warnings will hopefully make driver authors fix it :-)
1225 */
1226 ieee80211_check_queues(sdata);
1227
1228 ieee80211_setup_sdata(sdata, type);
1229
1230 err = ieee80211_do_open(sdata->dev, false);
1231 WARN(err, "type change: do_open returned %d", err);
1232
1233 return ret;
1234 }
1235
1236 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1237 enum nl80211_iftype type)
1238 {
1239 int ret;
1240
1241 ASSERT_RTNL();
1242
1243 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1244 return 0;
1245
1246 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1247 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1248 type == NL80211_IFTYPE_ADHOC)
1249 return -EOPNOTSUPP;
1250
1251 if (ieee80211_sdata_running(sdata)) {
1252 ret = ieee80211_runtime_change_iftype(sdata, type);
1253 if (ret)
1254 return ret;
1255 } else {
1256 /* Purge and reset type-dependent state. */
1257 ieee80211_teardown_sdata(sdata->dev);
1258 ieee80211_setup_sdata(sdata, type);
1259 }
1260
1261 /* reset some values that shouldn't be kept across type changes */
1262 sdata->vif.bss_conf.basic_rates =
1263 ieee80211_mandatory_rates(sdata->local,
1264 sdata->local->oper_channel->band);
1265 sdata->drop_unencrypted = 0;
1266 if (type == NL80211_IFTYPE_STATION)
1267 sdata->u.mgd.use_4addr = false;
1268
1269 return 0;
1270 }
1271
1272 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1273 struct net_device *dev,
1274 enum nl80211_iftype type)
1275 {
1276 struct ieee80211_sub_if_data *sdata;
1277 u64 mask, start, addr, val, inc;
1278 u8 *m;
1279 u8 tmp_addr[ETH_ALEN];
1280 int i;
1281
1282 /* default ... something at least */
1283 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1284
1285 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1286 local->hw.wiphy->n_addresses <= 1)
1287 return;
1288
1289
1290 mutex_lock(&local->iflist_mtx);
1291
1292 switch (type) {
1293 case NL80211_IFTYPE_MONITOR:
1294 /* doesn't matter */
1295 break;
1296 case NL80211_IFTYPE_WDS:
1297 case NL80211_IFTYPE_AP_VLAN:
1298 /* match up with an AP interface */
1299 list_for_each_entry(sdata, &local->interfaces, list) {
1300 if (sdata->vif.type != NL80211_IFTYPE_AP)
1301 continue;
1302 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1303 break;
1304 }
1305 /* keep default if no AP interface present */
1306 break;
1307 default:
1308 /* assign a new address if possible -- try n_addresses first */
1309 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1310 bool used = false;
1311
1312 list_for_each_entry(sdata, &local->interfaces, list) {
1313 if (memcmp(local->hw.wiphy->addresses[i].addr,
1314 sdata->vif.addr, ETH_ALEN) == 0) {
1315 used = true;
1316 break;
1317 }
1318 }
1319
1320 if (!used) {
1321 memcpy(dev->perm_addr,
1322 local->hw.wiphy->addresses[i].addr,
1323 ETH_ALEN);
1324 break;
1325 }
1326 }
1327
1328 /* try mask if available */
1329 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1330 break;
1331
1332 m = local->hw.wiphy->addr_mask;
1333 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1334 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1335 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1336
1337 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1338 /* not a contiguous mask ... not handled now! */
1339 pr_info("not contiguous\n");
1340 break;
1341 }
1342
1343 m = local->hw.wiphy->perm_addr;
1344 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1345 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1346 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1347
1348 inc = 1ULL<<__ffs64(mask);
1349 val = (start & mask);
1350 addr = (start & ~mask) | (val & mask);
1351 do {
1352 bool used = false;
1353
1354 tmp_addr[5] = addr >> 0*8;
1355 tmp_addr[4] = addr >> 1*8;
1356 tmp_addr[3] = addr >> 2*8;
1357 tmp_addr[2] = addr >> 3*8;
1358 tmp_addr[1] = addr >> 4*8;
1359 tmp_addr[0] = addr >> 5*8;
1360
1361 val += inc;
1362
1363 list_for_each_entry(sdata, &local->interfaces, list) {
1364 if (memcmp(tmp_addr, sdata->vif.addr,
1365 ETH_ALEN) == 0) {
1366 used = true;
1367 break;
1368 }
1369 }
1370
1371 if (!used) {
1372 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1373 break;
1374 }
1375 addr = (start & ~mask) | (val & mask);
1376 } while (addr != start);
1377
1378 break;
1379 }
1380
1381 mutex_unlock(&local->iflist_mtx);
1382 }
1383
1384 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1385 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1386 struct vif_params *params)
1387 {
1388 struct net_device *ndev;
1389 struct ieee80211_sub_if_data *sdata = NULL;
1390 int ret, i;
1391 int txqs = 1;
1392
1393 ASSERT_RTNL();
1394
1395 if (local->hw.queues >= IEEE80211_NUM_ACS)
1396 txqs = IEEE80211_NUM_ACS;
1397
1398 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1399 name, ieee80211_if_setup, txqs, 1);
1400 if (!ndev)
1401 return -ENOMEM;
1402 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1403
1404 ndev->needed_headroom = local->tx_headroom +
1405 4*6 /* four MAC addresses */
1406 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1407 + 6 /* mesh */
1408 + 8 /* rfc1042/bridge tunnel */
1409 - ETH_HLEN /* ethernet hard_header_len */
1410 + IEEE80211_ENCRYPT_HEADROOM;
1411 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1412
1413 ret = dev_alloc_name(ndev, ndev->name);
1414 if (ret < 0)
1415 goto fail;
1416
1417 ieee80211_assign_perm_addr(local, ndev, type);
1418 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1419 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1420
1421 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1422 sdata = netdev_priv(ndev);
1423 ndev->ieee80211_ptr = &sdata->wdev;
1424 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1425 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1426
1427 /* initialise type-independent data */
1428 sdata->wdev.wiphy = local->hw.wiphy;
1429 sdata->local = local;
1430 sdata->dev = ndev;
1431 #ifdef CONFIG_INET
1432 sdata->arp_filter_state = true;
1433 #endif
1434
1435 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1436 skb_queue_head_init(&sdata->fragments[i].skb_list);
1437
1438 INIT_LIST_HEAD(&sdata->key_list);
1439
1440 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1441 struct ieee80211_supported_band *sband;
1442 sband = local->hw.wiphy->bands[i];
1443 sdata->rc_rateidx_mask[i] =
1444 sband ? (1 << sband->n_bitrates) - 1 : 0;
1445 if (sband)
1446 memcpy(sdata->rc_rateidx_mcs_mask[i],
1447 sband->ht_cap.mcs.rx_mask,
1448 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1449 else
1450 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1451 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1452 }
1453
1454 ieee80211_set_default_queues(sdata);
1455
1456 /* setup type-dependent data */
1457 ieee80211_setup_sdata(sdata, type);
1458
1459 if (params) {
1460 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1461 if (type == NL80211_IFTYPE_STATION)
1462 sdata->u.mgd.use_4addr = params->use_4addr;
1463 }
1464
1465 ndev->features |= local->hw.netdev_features;
1466
1467 ret = register_netdevice(ndev);
1468 if (ret)
1469 goto fail;
1470
1471 mutex_lock(&local->iflist_mtx);
1472 list_add_tail_rcu(&sdata->list, &local->interfaces);
1473 mutex_unlock(&local->iflist_mtx);
1474
1475 if (new_wdev)
1476 *new_wdev = &sdata->wdev;
1477
1478 return 0;
1479
1480 fail:
1481 free_netdev(ndev);
1482 return ret;
1483 }
1484
1485 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1486 {
1487 ASSERT_RTNL();
1488
1489 mutex_lock(&sdata->local->iflist_mtx);
1490 list_del_rcu(&sdata->list);
1491 mutex_unlock(&sdata->local->iflist_mtx);
1492
1493 synchronize_rcu();
1494 unregister_netdevice(sdata->dev);
1495 }
1496
1497 /*
1498 * Remove all interfaces, may only be called at hardware unregistration
1499 * time because it doesn't do RCU-safe list removals.
1500 */
1501 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1502 {
1503 struct ieee80211_sub_if_data *sdata, *tmp;
1504 LIST_HEAD(unreg_list);
1505
1506 ASSERT_RTNL();
1507
1508 mutex_lock(&local->iflist_mtx);
1509 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1510 list_del(&sdata->list);
1511
1512 unregister_netdevice_queue(sdata->dev, &unreg_list);
1513 }
1514 mutex_unlock(&local->iflist_mtx);
1515 unregister_netdevice_many(&unreg_list);
1516 list_del(&unreg_list);
1517 }
1518
1519 static int netdev_notify(struct notifier_block *nb,
1520 unsigned long state,
1521 void *ndev)
1522 {
1523 struct net_device *dev = ndev;
1524 struct ieee80211_sub_if_data *sdata;
1525
1526 if (state != NETDEV_CHANGENAME)
1527 return 0;
1528
1529 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1530 return 0;
1531
1532 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1533 return 0;
1534
1535 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1536
1537 memcpy(sdata->name, dev->name, IFNAMSIZ);
1538
1539 ieee80211_debugfs_rename_netdev(sdata);
1540 return 0;
1541 }
1542
1543 static struct notifier_block mac80211_netdev_notifier = {
1544 .notifier_call = netdev_notify,
1545 };
1546
1547 int ieee80211_iface_init(void)
1548 {
1549 return register_netdevice_notifier(&mac80211_netdev_notifier);
1550 }
1551
1552 void ieee80211_iface_exit(void)
1553 {
1554 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1555 }
Linux kernel - Deliverables
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