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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / net / mac80211 / iface.c
blob3dfd20a453aba250fff726d1733f0dac6c763b3c
1 /*
2 * Interface handling
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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 int power;
49
50 rcu_read_lock();
51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 if (!chanctx_conf) {
53 rcu_read_unlock();
54 return false;
55 }
56
57 power = ieee80211_chandef_max_power(&chanctx_conf->def);
58 rcu_read_unlock();
59
60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 power = min(power, sdata->user_power_level);
62
63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->ap_power_level);
65
66 if (power != sdata->vif.bss_conf.txpower) {
67 sdata->vif.bss_conf.txpower = power;
68 ieee80211_hw_config(sdata->local, 0);
69 return true;
70 }
71
72 return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 if (__ieee80211_recalc_txpower(sdata))
78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
82 {
83 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84 return 0;
85
86 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87 return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
91 {
92 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93 return 0;
94
95 ieee80211_flush_queues(local, NULL);
96
97 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102 bool force_active)
103 {
104 bool working = false, scanning, active;
105 unsigned int led_trig_start = 0, led_trig_stop = 0;
106 struct ieee80211_roc_work *roc;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = force_active ||
111 !list_empty(&local->chanctx_list) ||
112 local->monitors;
113
114 if (!local->ops->remain_on_channel) {
115 list_for_each_entry(roc, &local->roc_list, list) {
116 working = true;
117 break;
118 }
119 }
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156 return -EINVAL;
157
158 dev->mtu = new_mtu;
159 return 0;
160 }
161
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
163 bool check_dup)
164 {
165 struct ieee80211_local *local = sdata->local;
166 struct ieee80211_sub_if_data *iter;
167 u64 new, mask, tmp;
168 u8 *m;
169 int ret = 0;
170
171 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172 return 0;
173
174 m = addr;
175 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178
179 m = local->hw.wiphy->addr_mask;
180 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183
184 if (!check_dup)
185 return ret;
186
187 mutex_lock(&local->iflist_mtx);
188 list_for_each_entry(iter, &local->interfaces, list) {
189 if (iter == sdata)
190 continue;
191
192 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
194 continue;
195
196 m = iter->vif.addr;
197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200
201 if ((new & ~mask) != (tmp & ~mask)) {
202 ret = -EINVAL;
203 break;
204 }
205 }
206 mutex_unlock(&local->iflist_mtx);
207
208 return ret;
209 }
210
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214 struct sockaddr *sa = addr;
215 bool check_dup = true;
216 int ret;
217
218 if (ieee80211_sdata_running(sdata))
219 return -EBUSY;
220
221 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
223 check_dup = false;
224
225 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226 if (ret)
227 return ret;
228
229 ret = eth_mac_addr(dev, sa);
230
231 if (ret == 0)
232 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233
234 return ret;
235 }
236
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239 return type1 == NL80211_IFTYPE_MONITOR ||
240 type2 == NL80211_IFTYPE_MONITOR ||
241 type1 == NL80211_IFTYPE_P2P_DEVICE ||
242 type2 == NL80211_IFTYPE_P2P_DEVICE ||
243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244 (type1 == NL80211_IFTYPE_WDS &&
245 (type2 == NL80211_IFTYPE_WDS ||
246 type2 == NL80211_IFTYPE_AP)) ||
247 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248 (type1 == NL80211_IFTYPE_AP_VLAN &&
249 (type2 == NL80211_IFTYPE_AP ||
250 type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254 enum nl80211_iftype iftype)
255 {
256 struct ieee80211_local *local = sdata->local;
257 struct ieee80211_sub_if_data *nsdata;
258
259 ASSERT_RTNL();
260
261 /* we hold the RTNL here so can safely walk the list */
262 list_for_each_entry(nsdata, &local->interfaces, list) {
263 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
264 /*
265 * Allow only a single IBSS interface to be up at any
266 * time. This is restricted because beacon distribution
267 * cannot work properly if both are in the same IBSS.
268 *
269 * To remove this restriction we'd have to disallow them
270 * from setting the same SSID on different IBSS interfaces
271 * belonging to the same hardware. Then, however, we're
272 * faced with having to adopt two different TSF timers...
273 */
274 if (iftype == NL80211_IFTYPE_ADHOC &&
275 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276 return -EBUSY;
277 /*
278 * will not add another interface while any channel
279 * switch is active.
280 */
281 if (nsdata->vif.csa_active)
282 return -EBUSY;
283
284 /*
285 * The remaining checks are only performed for interfaces
286 * with the same MAC address.
287 */
288 if (!ether_addr_equal(sdata->vif.addr,
289 nsdata->vif.addr))
290 continue;
291
292 /*
293 * check whether it may have the same address
294 */
295 if (!identical_mac_addr_allowed(iftype,
296 nsdata->vif.type))
297 return -ENOTUNIQ;
298
299 /*
300 * can only add VLANs to enabled APs
301 */
302 if (iftype == NL80211_IFTYPE_AP_VLAN &&
303 nsdata->vif.type == NL80211_IFTYPE_AP)
304 sdata->bss = &nsdata->u.ap;
305 }
306 }
307
308 return 0;
309 }
310
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 enum nl80211_iftype iftype)
313 {
314 int n_queues = sdata->local->hw.queues;
315 int i;
316
317 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
318 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320 IEEE80211_INVAL_HW_QUEUE))
321 return -EINVAL;
322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323 n_queues))
324 return -EINVAL;
325 }
326 }
327
328 if ((iftype != NL80211_IFTYPE_AP &&
329 iftype != NL80211_IFTYPE_P2P_GO &&
330 iftype != NL80211_IFTYPE_MESH_POINT) ||
331 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333 return 0;
334 }
335
336 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337 return -EINVAL;
338
339 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340 return -EINVAL;
341
342 return 0;
343 }
344
345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346 const int offset)
347 {
348 struct ieee80211_local *local = sdata->local;
349 u32 flags = sdata->u.mntr_flags;
350
351 #define ADJUST(_f, _s) do { \
352 if (flags & MONITOR_FLAG_##_f) \
353 local->fif_##_s += offset; \
354 } while (0)
355
356 ADJUST(FCSFAIL, fcsfail);
357 ADJUST(PLCPFAIL, plcpfail);
358 ADJUST(CONTROL, control);
359 ADJUST(CONTROL, pspoll);
360 ADJUST(OTHER_BSS, other_bss);
361
362 #undef ADJUST
363 }
364
365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367 struct ieee80211_local *local = sdata->local;
368 int i;
369
370 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373 else if (local->hw.queues >= IEEE80211_NUM_ACS)
374 sdata->vif.hw_queue[i] = i;
375 else
376 sdata->vif.hw_queue[i] = 0;
377 }
378 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380
381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383 struct ieee80211_sub_if_data *sdata;
384 int ret;
385
386 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387 return 0;
388
389 ASSERT_RTNL();
390
391 if (local->monitor_sdata)
392 return 0;
393
394 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395 if (!sdata)
396 return -ENOMEM;
397
398 /* set up data */
399 sdata->local = local;
400 sdata->vif.type = NL80211_IFTYPE_MONITOR;
401 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402 wiphy_name(local->hw.wiphy));
403
404 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
405
406 ieee80211_set_default_queues(sdata);
407
408 ret = drv_add_interface(local, sdata);
409 if (WARN_ON(ret)) {
410 /* ok .. stupid driver, it asked for this! */
411 kfree(sdata);
412 return ret;
413 }
414
415 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
416 if (ret) {
417 kfree(sdata);
418 return ret;
419 }
420
421 mutex_lock(&local->mtx);
422 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
423 IEEE80211_CHANCTX_EXCLUSIVE);
424 mutex_unlock(&local->mtx);
425 if (ret) {
426 drv_remove_interface(local, sdata);
427 kfree(sdata);
428 return ret;
429 }
430
431 mutex_lock(&local->iflist_mtx);
432 rcu_assign_pointer(local->monitor_sdata, sdata);
433 mutex_unlock(&local->iflist_mtx);
434
435 return 0;
436 }
437
438 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
439 {
440 struct ieee80211_sub_if_data *sdata;
441
442 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
443 return;
444
445 ASSERT_RTNL();
446
447 mutex_lock(&local->iflist_mtx);
448
449 sdata = rcu_dereference_protected(local->monitor_sdata,
450 lockdep_is_held(&local->iflist_mtx));
451 if (!sdata) {
452 mutex_unlock(&local->iflist_mtx);
453 return;
454 }
455
456 rcu_assign_pointer(local->monitor_sdata, NULL);
457 mutex_unlock(&local->iflist_mtx);
458
459 synchronize_net();
460
461 mutex_lock(&local->mtx);
462 ieee80211_vif_release_channel(sdata);
463 mutex_unlock(&local->mtx);
464
465 drv_remove_interface(local, sdata);
466
467 kfree(sdata);
468 }
469
470 /*
471 * NOTE: Be very careful when changing this function, it must NOT return
472 * an error on interface type changes that have been pre-checked, so most
473 * checks should be in ieee80211_check_concurrent_iface.
474 */
475 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
476 {
477 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
478 struct net_device *dev = wdev->netdev;
479 struct ieee80211_local *local = sdata->local;
480 struct sta_info *sta;
481 u32 changed = 0;
482 int res;
483 u32 hw_reconf_flags = 0;
484
485 switch (sdata->vif.type) {
486 case NL80211_IFTYPE_WDS:
487 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
488 return -ENOLINK;
489 break;
490 case NL80211_IFTYPE_AP_VLAN: {
491 struct ieee80211_sub_if_data *master;
492
493 if (!sdata->bss)
494 return -ENOLINK;
495
496 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
497
498 master = container_of(sdata->bss,
499 struct ieee80211_sub_if_data, u.ap);
500 sdata->control_port_protocol =
501 master->control_port_protocol;
502 sdata->control_port_no_encrypt =
503 master->control_port_no_encrypt;
504 sdata->vif.cab_queue = master->vif.cab_queue;
505 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
506 sizeof(sdata->vif.hw_queue));
507 break;
508 }
509 case NL80211_IFTYPE_AP:
510 sdata->bss = &sdata->u.ap;
511 break;
512 case NL80211_IFTYPE_MESH_POINT:
513 case NL80211_IFTYPE_STATION:
514 case NL80211_IFTYPE_MONITOR:
515 case NL80211_IFTYPE_ADHOC:
516 case NL80211_IFTYPE_P2P_DEVICE:
517 /* no special treatment */
518 break;
519 case NL80211_IFTYPE_UNSPECIFIED:
520 case NUM_NL80211_IFTYPES:
521 case NL80211_IFTYPE_P2P_CLIENT:
522 case NL80211_IFTYPE_P2P_GO:
523 /* cannot happen */
524 WARN_ON(1);
525 break;
526 }
527
528 if (local->open_count == 0) {
529 res = drv_start(local);
530 if (res)
531 goto err_del_bss;
532 /* we're brought up, everything changes */
533 hw_reconf_flags = ~0;
534 ieee80211_led_radio(local, true);
535 ieee80211_mod_tpt_led_trig(local,
536 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
537 }
538
539 /*
540 * Copy the hopefully now-present MAC address to
541 * this interface, if it has the special null one.
542 */
543 if (dev && is_zero_ether_addr(dev->dev_addr)) {
544 memcpy(dev->dev_addr,
545 local->hw.wiphy->perm_addr,
546 ETH_ALEN);
547 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
548
549 if (!is_valid_ether_addr(dev->dev_addr)) {
550 res = -EADDRNOTAVAIL;
551 goto err_stop;
552 }
553 }
554
555 switch (sdata->vif.type) {
556 case NL80211_IFTYPE_AP_VLAN:
557 /* no need to tell driver, but set carrier and chanctx */
558 if (rtnl_dereference(sdata->bss->beacon)) {
559 ieee80211_vif_vlan_copy_chanctx(sdata);
560 netif_carrier_on(dev);
561 } else {
562 netif_carrier_off(dev);
563 }
564 break;
565 case NL80211_IFTYPE_MONITOR:
566 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
567 local->cooked_mntrs++;
568 break;
569 }
570
571 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
572 res = drv_add_interface(local, sdata);
573 if (res)
574 goto err_stop;
575 } else if (local->monitors == 0 && local->open_count == 0) {
576 res = ieee80211_add_virtual_monitor(local);
577 if (res)
578 goto err_stop;
579 }
580
581 /* must be before the call to ieee80211_configure_filter */
582 local->monitors++;
583 if (local->monitors == 1) {
584 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
585 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
586 }
587
588 ieee80211_adjust_monitor_flags(sdata, 1);
589 ieee80211_configure_filter(local);
590 mutex_lock(&local->mtx);
591 ieee80211_recalc_idle(local);
592 mutex_unlock(&local->mtx);
593
594 netif_carrier_on(dev);
595 break;
596 default:
597 if (coming_up) {
598 ieee80211_del_virtual_monitor(local);
599
600 res = drv_add_interface(local, sdata);
601 if (res)
602 goto err_stop;
603 res = ieee80211_check_queues(sdata,
604 ieee80211_vif_type_p2p(&sdata->vif));
605 if (res)
606 goto err_del_interface;
607 }
608
609 if (sdata->vif.type == NL80211_IFTYPE_AP) {
610 local->fif_pspoll++;
611 local->fif_probe_req++;
612
613 ieee80211_configure_filter(local);
614 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
615 local->fif_probe_req++;
616 }
617
618 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
619 changed |= ieee80211_reset_erp_info(sdata);
620 ieee80211_bss_info_change_notify(sdata, changed);
621
622 switch (sdata->vif.type) {
623 case NL80211_IFTYPE_STATION:
624 case NL80211_IFTYPE_ADHOC:
625 case NL80211_IFTYPE_AP:
626 case NL80211_IFTYPE_MESH_POINT:
627 netif_carrier_off(dev);
628 break;
629 case NL80211_IFTYPE_WDS:
630 case NL80211_IFTYPE_P2P_DEVICE:
631 break;
632 default:
633 /* not reached */
634 WARN_ON(1);
635 }
636
637 /*
638 * set default queue parameters so drivers don't
639 * need to initialise the hardware if the hardware
640 * doesn't start up with sane defaults
641 */
642 ieee80211_set_wmm_default(sdata, true);
643 }
644
645 set_bit(SDATA_STATE_RUNNING, &sdata->state);
646
647 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
648 /* Create STA entry for the WDS peer */
649 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
650 GFP_KERNEL);
651 if (!sta) {
652 res = -ENOMEM;
653 goto err_del_interface;
654 }
655
656 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
657 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
658 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
659
660 res = sta_info_insert(sta);
661 if (res) {
662 /* STA has been freed */
663 goto err_del_interface;
664 }
665
666 rate_control_rate_init(sta);
667 netif_carrier_on(dev);
668 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
669 rcu_assign_pointer(local->p2p_sdata, sdata);
670 }
671
672 /*
673 * set_multicast_list will be invoked by the networking core
674 * which will check whether any increments here were done in
675 * error and sync them down to the hardware as filter flags.
676 */
677 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
678 atomic_inc(&local->iff_allmultis);
679
680 if (sdata->flags & IEEE80211_SDATA_PROMISC)
681 atomic_inc(&local->iff_promiscs);
682
683 if (coming_up)
684 local->open_count++;
685
686 if (hw_reconf_flags)
687 ieee80211_hw_config(local, hw_reconf_flags);
688
689 ieee80211_recalc_ps(local, -1);
690
691 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
692 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
693 /* XXX: for AP_VLAN, actually track AP queues */
694 netif_tx_start_all_queues(dev);
695 } else if (dev) {
696 unsigned long flags;
697 int n_acs = IEEE80211_NUM_ACS;
698 int ac;
699
700 if (local->hw.queues < IEEE80211_NUM_ACS)
701 n_acs = 1;
702
703 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
704 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
705 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
706 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
707 for (ac = 0; ac < n_acs; ac++) {
708 int ac_queue = sdata->vif.hw_queue[ac];
709
710 if (local->queue_stop_reasons[ac_queue] == 0 &&
711 skb_queue_empty(&local->pending[ac_queue]))
712 netif_start_subqueue(dev, ac);
713 }
714 }
715 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
716 }
717
718 return 0;
719 err_del_interface:
720 drv_remove_interface(local, sdata);
721 err_stop:
722 if (!local->open_count)
723 drv_stop(local);
724 err_del_bss:
725 sdata->bss = NULL;
726 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
727 list_del(&sdata->u.vlan.list);
728 /* might already be clear but that doesn't matter */
729 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
730 return res;
731 }
732
733 static int ieee80211_open(struct net_device *dev)
734 {
735 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
736 int err;
737
738 /* fail early if user set an invalid address */
739 if (!is_valid_ether_addr(dev->dev_addr))
740 return -EADDRNOTAVAIL;
741
742 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
743 if (err)
744 return err;
745
746 return ieee80211_do_open(&sdata->wdev, true);
747 }
748
749 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
750 bool going_down)
751 {
752 struct ieee80211_local *local = sdata->local;
753 unsigned long flags;
754 struct sk_buff *skb, *tmp;
755 u32 hw_reconf_flags = 0;
756 int i, flushed;
757 struct ps_data *ps;
758 struct cfg80211_chan_def chandef;
759
760 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
761
762 if (rcu_access_pointer(local->scan_sdata) == sdata)
763 ieee80211_scan_cancel(local);
764
765 /*
766 * Stop TX on this interface first.
767 */
768 if (sdata->dev)
769 netif_tx_stop_all_queues(sdata->dev);
770
771 ieee80211_roc_purge(local, sdata);
772
773 if (sdata->vif.type == NL80211_IFTYPE_STATION)
774 ieee80211_mgd_stop(sdata);
775
776 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
777 ieee80211_ibss_stop(sdata);
778
779
780 /*
781 * Remove all stations associated with this interface.
782 *
783 * This must be done before calling ops->remove_interface()
784 * because otherwise we can later invoke ops->sta_notify()
785 * whenever the STAs are removed, and that invalidates driver
786 * assumptions about always getting a vif pointer that is valid
787 * (because if we remove a STA after ops->remove_interface()
788 * the driver will have removed the vif info already!)
789 *
790 * This is relevant only in WDS mode, in all other modes we've
791 * already removed all stations when disconnecting or similar,
792 * so warn otherwise.
793 */
794 flushed = sta_info_flush(sdata);
795 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
796 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
797
798 /* don't count this interface for promisc/allmulti while it is down */
799 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
800 atomic_dec(&local->iff_allmultis);
801
802 if (sdata->flags & IEEE80211_SDATA_PROMISC)
803 atomic_dec(&local->iff_promiscs);
804
805 if (sdata->vif.type == NL80211_IFTYPE_AP) {
806 local->fif_pspoll--;
807 local->fif_probe_req--;
808 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
809 local->fif_probe_req--;
810 }
811
812 if (sdata->dev) {
813 netif_addr_lock_bh(sdata->dev);
814 spin_lock_bh(&local->filter_lock);
815 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
816 sdata->dev->addr_len);
817 spin_unlock_bh(&local->filter_lock);
818 netif_addr_unlock_bh(sdata->dev);
819 }
820
821 del_timer_sync(&local->dynamic_ps_timer);
822 cancel_work_sync(&local->dynamic_ps_enable_work);
823
824 cancel_work_sync(&sdata->recalc_smps);
825 sdata->vif.csa_active = false;
826 cancel_work_sync(&sdata->csa_finalize_work);
827
828 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
829
830 if (sdata->wdev.cac_started) {
831 chandef = sdata->vif.bss_conf.chandef;
832 WARN_ON(local->suspended);
833 mutex_lock(&local->mtx);
834 ieee80211_vif_release_channel(sdata);
835 mutex_unlock(&local->mtx);
836 cfg80211_cac_event(sdata->dev, &chandef,
837 NL80211_RADAR_CAC_ABORTED,
838 GFP_KERNEL);
839 }
840
841 /* APs need special treatment */
842 if (sdata->vif.type == NL80211_IFTYPE_AP) {
843 struct ieee80211_sub_if_data *vlan, *tmpsdata;
844
845 /* down all dependent devices, that is VLANs */
846 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
847 u.vlan.list)
848 dev_close(vlan->dev);
849 WARN_ON(!list_empty(&sdata->u.ap.vlans));
850 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
851 /* remove all packets in parent bc_buf pointing to this dev */
852 ps = &sdata->bss->ps;
853
854 spin_lock_irqsave(&ps->bc_buf.lock, flags);
855 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
856 if (skb->dev == sdata->dev) {
857 __skb_unlink(skb, &ps->bc_buf);
858 local->total_ps_buffered--;
859 ieee80211_free_txskb(&local->hw, skb);
860 }
861 }
862 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
863 }
864
865 if (going_down)
866 local->open_count--;
867
868 switch (sdata->vif.type) {
869 case NL80211_IFTYPE_AP_VLAN:
870 list_del(&sdata->u.vlan.list);
871 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
872 /* no need to tell driver */
873 break;
874 case NL80211_IFTYPE_MONITOR:
875 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
876 local->cooked_mntrs--;
877 break;
878 }
879
880 local->monitors--;
881 if (local->monitors == 0) {
882 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
883 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
884 }
885
886 ieee80211_adjust_monitor_flags(sdata, -1);
887 break;
888 case NL80211_IFTYPE_P2P_DEVICE:
889 /* relies on synchronize_rcu() below */
890 rcu_assign_pointer(local->p2p_sdata, NULL);
891 /* fall through */
892 default:
893 cancel_work_sync(&sdata->work);
894 /*
895 * When we get here, the interface is marked down.
896 * Free the remaining keys, if there are any
897 * (shouldn't be, except maybe in WDS mode?)
898 *
899 * Force the key freeing to always synchronize_net()
900 * to wait for the RX path in case it is using this
901 * interface enqueuing frames * at this very time on
902 * another CPU.
903 */
904 ieee80211_free_keys(sdata, true);
905
906 /* fall through */
907 case NL80211_IFTYPE_AP:
908 skb_queue_purge(&sdata->skb_queue);
909 }
910
911 sdata->bss = NULL;
912
913 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
914 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
915 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
916 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
917 if (info->control.vif == &sdata->vif) {
918 __skb_unlink(skb, &local->pending[i]);
919 ieee80211_free_txskb(&local->hw, skb);
920 }
921 }
922 }
923 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
924
925 if (local->open_count == 0)
926 ieee80211_clear_tx_pending(local);
927
928 /*
929 * If the interface goes down while suspended, presumably because
930 * the device was unplugged and that happens before our resume,
931 * then the driver is already unconfigured and the remainder of
932 * this function isn't needed.
933 * XXX: what about WoWLAN? If the device has software state, e.g.
934 * memory allocated, it might expect teardown commands from
935 * mac80211 here?
936 */
937 if (local->suspended) {
938 WARN_ON(local->wowlan);
939 WARN_ON(rtnl_dereference(local->monitor_sdata));
940 return;
941 }
942
943 switch (sdata->vif.type) {
944 case NL80211_IFTYPE_AP_VLAN:
945 break;
946 case NL80211_IFTYPE_MONITOR:
947 if (local->monitors == 0)
948 ieee80211_del_virtual_monitor(local);
949
950 mutex_lock(&local->mtx);
951 ieee80211_recalc_idle(local);
952 mutex_unlock(&local->mtx);
953
954 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
955 break;
956
957 /* fall through */
958 default:
959 if (going_down)
960 drv_remove_interface(local, sdata);
961 }
962
963 ieee80211_recalc_ps(local, -1);
964
965 if (local->open_count == 0) {
966 ieee80211_stop_device(local);
967
968 /* no reconfiguring after stop! */
969 return;
970 }
971
972 /* do after stop to avoid reconfiguring when we stop anyway */
973 ieee80211_configure_filter(local);
974 ieee80211_hw_config(local, hw_reconf_flags);
975
976 if (local->monitors == local->open_count)
977 ieee80211_add_virtual_monitor(local);
978 }
979
980 static int ieee80211_stop(struct net_device *dev)
981 {
982 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
983
984 ieee80211_do_stop(sdata, true);
985
986 return 0;
987 }
988
989 static void ieee80211_set_multicast_list(struct net_device *dev)
990 {
991 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
992 struct ieee80211_local *local = sdata->local;
993 int allmulti, promisc, sdata_allmulti, sdata_promisc;
994
995 allmulti = !!(dev->flags & IFF_ALLMULTI);
996 promisc = !!(dev->flags & IFF_PROMISC);
997 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
998 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
999
1000 if (allmulti != sdata_allmulti) {
1001 if (dev->flags & IFF_ALLMULTI)
1002 atomic_inc(&local->iff_allmultis);
1003 else
1004 atomic_dec(&local->iff_allmultis);
1005 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1006 }
1007
1008 if (promisc != sdata_promisc) {
1009 if (dev->flags & IFF_PROMISC)
1010 atomic_inc(&local->iff_promiscs);
1011 else
1012 atomic_dec(&local->iff_promiscs);
1013 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1014 }
1015 spin_lock_bh(&local->filter_lock);
1016 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1017 spin_unlock_bh(&local->filter_lock);
1018 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1019 }
1020
1021 /*
1022 * Called when the netdev is removed or, by the code below, before
1023 * the interface type changes.
1024 */
1025 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1026 {
1027 int i;
1028
1029 /* free extra data */
1030 ieee80211_free_keys(sdata, false);
1031
1032 ieee80211_debugfs_remove_netdev(sdata);
1033
1034 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1035 __skb_queue_purge(&sdata->fragments[i].skb_list);
1036 sdata->fragment_next = 0;
1037
1038 if (ieee80211_vif_is_mesh(&sdata->vif))
1039 mesh_rmc_free(sdata);
1040 }
1041
1042 static void ieee80211_uninit(struct net_device *dev)
1043 {
1044 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1045 }
1046
1047 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1048 struct sk_buff *skb,
1049 void *accel_priv)
1050 {
1051 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1052 }
1053
1054 static const struct net_device_ops ieee80211_dataif_ops = {
1055 .ndo_open = ieee80211_open,
1056 .ndo_stop = ieee80211_stop,
1057 .ndo_uninit = ieee80211_uninit,
1058 .ndo_start_xmit = ieee80211_subif_start_xmit,
1059 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1060 .ndo_change_mtu = ieee80211_change_mtu,
1061 .ndo_set_mac_address = ieee80211_change_mac,
1062 .ndo_select_queue = ieee80211_netdev_select_queue,
1063 };
1064
1065 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1066 struct sk_buff *skb,
1067 void *accel_priv)
1068 {
1069 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1070 struct ieee80211_local *local = sdata->local;
1071 struct ieee80211_hdr *hdr;
1072 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1073
1074 if (local->hw.queues < IEEE80211_NUM_ACS)
1075 return 0;
1076
1077 if (skb->len < 4 ||
1078 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1079 return 0; /* doesn't matter, frame will be dropped */
1080
1081 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1082
1083 return ieee80211_select_queue_80211(sdata, skb, hdr);
1084 }
1085
1086 static const struct net_device_ops ieee80211_monitorif_ops = {
1087 .ndo_open = ieee80211_open,
1088 .ndo_stop = ieee80211_stop,
1089 .ndo_uninit = ieee80211_uninit,
1090 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1091 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1092 .ndo_change_mtu = ieee80211_change_mtu,
1093 .ndo_set_mac_address = ieee80211_change_mac,
1094 .ndo_select_queue = ieee80211_monitor_select_queue,
1095 };
1096
1097 static void ieee80211_if_setup(struct net_device *dev)
1098 {
1099 ether_setup(dev);
1100 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1101 dev->netdev_ops = &ieee80211_dataif_ops;
1102 dev->destructor = free_netdev;
1103 }
1104
1105 static void ieee80211_iface_work(struct work_struct *work)
1106 {
1107 struct ieee80211_sub_if_data *sdata =
1108 container_of(work, struct ieee80211_sub_if_data, work);
1109 struct ieee80211_local *local = sdata->local;
1110 struct sk_buff *skb;
1111 struct sta_info *sta;
1112 struct ieee80211_ra_tid *ra_tid;
1113
1114 if (!ieee80211_sdata_running(sdata))
1115 return;
1116
1117 if (local->scanning)
1118 return;
1119
1120 /*
1121 * ieee80211_queue_work() should have picked up most cases,
1122 * here we'll pick the rest.
1123 */
1124 if (WARN(local->suspended,
1125 "interface work scheduled while going to suspend\n"))
1126 return;
1127
1128 /* first process frames */
1129 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1130 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1131
1132 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1133 ra_tid = (void *)&skb->cb;
1134 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1135 ra_tid->tid);
1136 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1137 ra_tid = (void *)&skb->cb;
1138 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1139 ra_tid->tid);
1140 } else if (ieee80211_is_action(mgmt->frame_control) &&
1141 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1142 int len = skb->len;
1143
1144 mutex_lock(&local->sta_mtx);
1145 sta = sta_info_get_bss(sdata, mgmt->sa);
1146 if (sta) {
1147 switch (mgmt->u.action.u.addba_req.action_code) {
1148 case WLAN_ACTION_ADDBA_REQ:
1149 ieee80211_process_addba_request(
1150 local, sta, mgmt, len);
1151 break;
1152 case WLAN_ACTION_ADDBA_RESP:
1153 ieee80211_process_addba_resp(local, sta,
1154 mgmt, len);
1155 break;
1156 case WLAN_ACTION_DELBA:
1157 ieee80211_process_delba(sdata, sta,
1158 mgmt, len);
1159 break;
1160 default:
1161 WARN_ON(1);
1162 break;
1163 }
1164 }
1165 mutex_unlock(&local->sta_mtx);
1166 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1167 struct ieee80211_hdr *hdr = (void *)mgmt;
1168 /*
1169 * So the frame isn't mgmt, but frame_control
1170 * is at the right place anyway, of course, so
1171 * the if statement is correct.
1172 *
1173 * Warn if we have other data frame types here,
1174 * they must not get here.
1175 */
1176 WARN_ON(hdr->frame_control &
1177 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1178 WARN_ON(!(hdr->seq_ctrl &
1179 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1180 /*
1181 * This was a fragment of a frame, received while
1182 * a block-ack session was active. That cannot be
1183 * right, so terminate the session.
1184 */
1185 mutex_lock(&local->sta_mtx);
1186 sta = sta_info_get_bss(sdata, mgmt->sa);
1187 if (sta) {
1188 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1189 IEEE80211_QOS_CTL_TID_MASK;
1190
1191 __ieee80211_stop_rx_ba_session(
1192 sta, tid, WLAN_BACK_RECIPIENT,
1193 WLAN_REASON_QSTA_REQUIRE_SETUP,
1194 true);
1195 }
1196 mutex_unlock(&local->sta_mtx);
1197 } else switch (sdata->vif.type) {
1198 case NL80211_IFTYPE_STATION:
1199 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1200 break;
1201 case NL80211_IFTYPE_ADHOC:
1202 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1203 break;
1204 case NL80211_IFTYPE_MESH_POINT:
1205 if (!ieee80211_vif_is_mesh(&sdata->vif))
1206 break;
1207 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1208 break;
1209 default:
1210 WARN(1, "frame for unexpected interface type");
1211 break;
1212 }
1213
1214 kfree_skb(skb);
1215 }
1216
1217 /* then other type-dependent work */
1218 switch (sdata->vif.type) {
1219 case NL80211_IFTYPE_STATION:
1220 ieee80211_sta_work(sdata);
1221 break;
1222 case NL80211_IFTYPE_ADHOC:
1223 ieee80211_ibss_work(sdata);
1224 break;
1225 case NL80211_IFTYPE_MESH_POINT:
1226 if (!ieee80211_vif_is_mesh(&sdata->vif))
1227 break;
1228 ieee80211_mesh_work(sdata);
1229 break;
1230 default:
1231 break;
1232 }
1233 }
1234
1235 static void ieee80211_recalc_smps_work(struct work_struct *work)
1236 {
1237 struct ieee80211_sub_if_data *sdata =
1238 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1239
1240 ieee80211_recalc_smps(sdata);
1241 }
1242
1243 /*
1244 * Helper function to initialise an interface to a specific type.
1245 */
1246 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1247 enum nl80211_iftype type)
1248 {
1249 /* clear type-dependent union */
1250 memset(&sdata->u, 0, sizeof(sdata->u));
1251
1252 /* and set some type-dependent values */
1253 sdata->vif.type = type;
1254 sdata->vif.p2p = false;
1255 sdata->wdev.iftype = type;
1256
1257 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1258 sdata->control_port_no_encrypt = false;
1259 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1260
1261 sdata->noack_map = 0;
1262
1263 /* only monitor/p2p-device differ */
1264 if (sdata->dev) {
1265 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1266 sdata->dev->type = ARPHRD_ETHER;
1267 }
1268
1269 skb_queue_head_init(&sdata->skb_queue);
1270 INIT_WORK(&sdata->work, ieee80211_iface_work);
1271 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1272 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1273
1274 switch (type) {
1275 case NL80211_IFTYPE_P2P_GO:
1276 type = NL80211_IFTYPE_AP;
1277 sdata->vif.type = type;
1278 sdata->vif.p2p = true;
1279 /* fall through */
1280 case NL80211_IFTYPE_AP:
1281 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1282 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1283 INIT_WORK(&sdata->u.ap.request_smps_work,
1284 ieee80211_request_smps_ap_work);
1285 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1286 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1287 break;
1288 case NL80211_IFTYPE_P2P_CLIENT:
1289 type = NL80211_IFTYPE_STATION;
1290 sdata->vif.type = type;
1291 sdata->vif.p2p = true;
1292 /* fall through */
1293 case NL80211_IFTYPE_STATION:
1294 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1295 ieee80211_sta_setup_sdata(sdata);
1296 break;
1297 case NL80211_IFTYPE_ADHOC:
1298 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1299 ieee80211_ibss_setup_sdata(sdata);
1300 break;
1301 case NL80211_IFTYPE_MESH_POINT:
1302 if (ieee80211_vif_is_mesh(&sdata->vif))
1303 ieee80211_mesh_init_sdata(sdata);
1304 break;
1305 case NL80211_IFTYPE_MONITOR:
1306 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1307 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1308 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1309 MONITOR_FLAG_OTHER_BSS;
1310 break;
1311 case NL80211_IFTYPE_WDS:
1312 sdata->vif.bss_conf.bssid = NULL;
1313 break;
1314 case NL80211_IFTYPE_AP_VLAN:
1315 case NL80211_IFTYPE_P2P_DEVICE:
1316 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1317 break;
1318 case NL80211_IFTYPE_UNSPECIFIED:
1319 case NUM_NL80211_IFTYPES:
1320 BUG();
1321 break;
1322 }
1323
1324 ieee80211_debugfs_add_netdev(sdata);
1325 }
1326
1327 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1328 enum nl80211_iftype type)
1329 {
1330 struct ieee80211_local *local = sdata->local;
1331 int ret, err;
1332 enum nl80211_iftype internal_type = type;
1333 bool p2p = false;
1334
1335 ASSERT_RTNL();
1336
1337 if (!local->ops->change_interface)
1338 return -EBUSY;
1339
1340 switch (sdata->vif.type) {
1341 case NL80211_IFTYPE_AP:
1342 case NL80211_IFTYPE_STATION:
1343 case NL80211_IFTYPE_ADHOC:
1344 /*
1345 * Could maybe also all others here?
1346 * Just not sure how that interacts
1347 * with the RX/config path e.g. for
1348 * mesh.
1349 */
1350 break;
1351 default:
1352 return -EBUSY;
1353 }
1354
1355 switch (type) {
1356 case NL80211_IFTYPE_AP:
1357 case NL80211_IFTYPE_STATION:
1358 case NL80211_IFTYPE_ADHOC:
1359 /*
1360 * Could probably support everything
1361 * but WDS here (WDS do_open can fail
1362 * under memory pressure, which this
1363 * code isn't prepared to handle).
1364 */
1365 break;
1366 case NL80211_IFTYPE_P2P_CLIENT:
1367 p2p = true;
1368 internal_type = NL80211_IFTYPE_STATION;
1369 break;
1370 case NL80211_IFTYPE_P2P_GO:
1371 p2p = true;
1372 internal_type = NL80211_IFTYPE_AP;
1373 break;
1374 default:
1375 return -EBUSY;
1376 }
1377
1378 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1379 if (ret)
1380 return ret;
1381
1382 ieee80211_do_stop(sdata, false);
1383
1384 ieee80211_teardown_sdata(sdata);
1385
1386 ret = drv_change_interface(local, sdata, internal_type, p2p);
1387 if (ret)
1388 type = ieee80211_vif_type_p2p(&sdata->vif);
1389
1390 /*
1391 * Ignore return value here, there's not much we can do since
1392 * the driver changed the interface type internally already.
1393 * The warnings will hopefully make driver authors fix it :-)
1394 */
1395 ieee80211_check_queues(sdata, type);
1396
1397 ieee80211_setup_sdata(sdata, type);
1398
1399 err = ieee80211_do_open(&sdata->wdev, false);
1400 WARN(err, "type change: do_open returned %d", err);
1401
1402 return ret;
1403 }
1404
1405 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1406 enum nl80211_iftype type)
1407 {
1408 int ret;
1409
1410 ASSERT_RTNL();
1411
1412 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1413 return 0;
1414
1415 if (ieee80211_sdata_running(sdata)) {
1416 ret = ieee80211_runtime_change_iftype(sdata, type);
1417 if (ret)
1418 return ret;
1419 } else {
1420 /* Purge and reset type-dependent state. */
1421 ieee80211_teardown_sdata(sdata);
1422 ieee80211_setup_sdata(sdata, type);
1423 }
1424
1425 /* reset some values that shouldn't be kept across type changes */
1426 sdata->drop_unencrypted = 0;
1427 if (type == NL80211_IFTYPE_STATION)
1428 sdata->u.mgd.use_4addr = false;
1429
1430 return 0;
1431 }
1432
1433 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1434 u8 *perm_addr, enum nl80211_iftype type)
1435 {
1436 struct ieee80211_sub_if_data *sdata;
1437 u64 mask, start, addr, val, inc;
1438 u8 *m;
1439 u8 tmp_addr[ETH_ALEN];
1440 int i;
1441
1442 /* default ... something at least */
1443 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1444
1445 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1446 local->hw.wiphy->n_addresses <= 1)
1447 return;
1448
1449 mutex_lock(&local->iflist_mtx);
1450
1451 switch (type) {
1452 case NL80211_IFTYPE_MONITOR:
1453 /* doesn't matter */
1454 break;
1455 case NL80211_IFTYPE_WDS:
1456 case NL80211_IFTYPE_AP_VLAN:
1457 /* match up with an AP interface */
1458 list_for_each_entry(sdata, &local->interfaces, list) {
1459 if (sdata->vif.type != NL80211_IFTYPE_AP)
1460 continue;
1461 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1462 break;
1463 }
1464 /* keep default if no AP interface present */
1465 break;
1466 case NL80211_IFTYPE_P2P_CLIENT:
1467 case NL80211_IFTYPE_P2P_GO:
1468 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1469 list_for_each_entry(sdata, &local->interfaces, list) {
1470 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1471 continue;
1472 if (!ieee80211_sdata_running(sdata))
1473 continue;
1474 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1475 goto out_unlock;
1476 }
1477 }
1478 /* otherwise fall through */
1479 default:
1480 /* assign a new address if possible -- try n_addresses first */
1481 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1482 bool used = false;
1483
1484 list_for_each_entry(sdata, &local->interfaces, list) {
1485 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1486 sdata->vif.addr)) {
1487 used = true;
1488 break;
1489 }
1490 }
1491
1492 if (!used) {
1493 memcpy(perm_addr,
1494 local->hw.wiphy->addresses[i].addr,
1495 ETH_ALEN);
1496 break;
1497 }
1498 }
1499
1500 /* try mask if available */
1501 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1502 break;
1503
1504 m = local->hw.wiphy->addr_mask;
1505 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1506 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1507 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1508
1509 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1510 /* not a contiguous mask ... not handled now! */
1511 pr_info("not contiguous\n");
1512 break;
1513 }
1514
1515 /*
1516 * Pick address of existing interface in case user changed
1517 * MAC address manually, default to perm_addr.
1518 */
1519 m = local->hw.wiphy->perm_addr;
1520 list_for_each_entry(sdata, &local->interfaces, list) {
1521 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1522 continue;
1523 m = sdata->vif.addr;
1524 break;
1525 }
1526 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1527 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1528 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1529
1530 inc = 1ULL<<__ffs64(mask);
1531 val = (start & mask);
1532 addr = (start & ~mask) | (val & mask);
1533 do {
1534 bool used = false;
1535
1536 tmp_addr[5] = addr >> 0*8;
1537 tmp_addr[4] = addr >> 1*8;
1538 tmp_addr[3] = addr >> 2*8;
1539 tmp_addr[2] = addr >> 3*8;
1540 tmp_addr[1] = addr >> 4*8;
1541 tmp_addr[0] = addr >> 5*8;
1542
1543 val += inc;
1544
1545 list_for_each_entry(sdata, &local->interfaces, list) {
1546 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1547 used = true;
1548 break;
1549 }
1550 }
1551
1552 if (!used) {
1553 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1554 break;
1555 }
1556 addr = (start & ~mask) | (val & mask);
1557 } while (addr != start);
1558
1559 break;
1560 }
1561
1562 out_unlock:
1563 mutex_unlock(&local->iflist_mtx);
1564 }
1565
1566 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1567 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1568 struct vif_params *params)
1569 {
1570 struct net_device *ndev = NULL;
1571 struct ieee80211_sub_if_data *sdata = NULL;
1572 int ret, i;
1573 int txqs = 1;
1574
1575 ASSERT_RTNL();
1576
1577 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1578 struct wireless_dev *wdev;
1579
1580 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1581 GFP_KERNEL);
1582 if (!sdata)
1583 return -ENOMEM;
1584 wdev = &sdata->wdev;
1585
1586 sdata->dev = NULL;
1587 strlcpy(sdata->name, name, IFNAMSIZ);
1588 ieee80211_assign_perm_addr(local, wdev->address, type);
1589 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1590 } else {
1591 if (local->hw.queues >= IEEE80211_NUM_ACS)
1592 txqs = IEEE80211_NUM_ACS;
1593
1594 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1595 local->hw.vif_data_size,
1596 name, ieee80211_if_setup, txqs, 1);
1597 if (!ndev)
1598 return -ENOMEM;
1599 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1600
1601 ndev->needed_headroom = local->tx_headroom +
1602 4*6 /* four MAC addresses */
1603 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1604 + 6 /* mesh */
1605 + 8 /* rfc1042/bridge tunnel */
1606 - ETH_HLEN /* ethernet hard_header_len */
1607 + IEEE80211_ENCRYPT_HEADROOM;
1608 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1609
1610 ret = dev_alloc_name(ndev, ndev->name);
1611 if (ret < 0) {
1612 free_netdev(ndev);
1613 return ret;
1614 }
1615
1616 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1617 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1618 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1619
1620 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1621 sdata = netdev_priv(ndev);
1622 ndev->ieee80211_ptr = &sdata->wdev;
1623 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1624 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1625
1626 sdata->dev = ndev;
1627 }
1628
1629 /* initialise type-independent data */
1630 sdata->wdev.wiphy = local->hw.wiphy;
1631 sdata->local = local;
1632
1633 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1634 skb_queue_head_init(&sdata->fragments[i].skb_list);
1635
1636 INIT_LIST_HEAD(&sdata->key_list);
1637
1638 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1639 ieee80211_dfs_cac_timer_work);
1640 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1641 ieee80211_delayed_tailroom_dec);
1642
1643 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1644 struct ieee80211_supported_band *sband;
1645 sband = local->hw.wiphy->bands[i];
1646 sdata->rc_rateidx_mask[i] =
1647 sband ? (1 << sband->n_bitrates) - 1 : 0;
1648 if (sband)
1649 memcpy(sdata->rc_rateidx_mcs_mask[i],
1650 sband->ht_cap.mcs.rx_mask,
1651 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1652 else
1653 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1654 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1655 }
1656
1657 ieee80211_set_default_queues(sdata);
1658
1659 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1660 sdata->user_power_level = local->user_power_level;
1661
1662 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1663
1664 /* setup type-dependent data */
1665 ieee80211_setup_sdata(sdata, type);
1666
1667 if (ndev) {
1668 if (params) {
1669 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1670 if (type == NL80211_IFTYPE_STATION)
1671 sdata->u.mgd.use_4addr = params->use_4addr;
1672 }
1673
1674 ndev->features |= local->hw.netdev_features;
1675
1676 ret = register_netdevice(ndev);
1677 if (ret) {
1678 free_netdev(ndev);
1679 return ret;
1680 }
1681 }
1682
1683 mutex_lock(&local->iflist_mtx);
1684 list_add_tail_rcu(&sdata->list, &local->interfaces);
1685 mutex_unlock(&local->iflist_mtx);
1686
1687 if (new_wdev)
1688 *new_wdev = &sdata->wdev;
1689
1690 return 0;
1691 }
1692
1693 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1694 {
1695 ASSERT_RTNL();
1696
1697 mutex_lock(&sdata->local->iflist_mtx);
1698 list_del_rcu(&sdata->list);
1699 mutex_unlock(&sdata->local->iflist_mtx);
1700
1701 synchronize_rcu();
1702
1703 if (sdata->dev) {
1704 unregister_netdevice(sdata->dev);
1705 } else {
1706 cfg80211_unregister_wdev(&sdata->wdev);
1707 kfree(sdata);
1708 }
1709 }
1710
1711 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1712 {
1713 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1714 return;
1715 ieee80211_do_stop(sdata, true);
1716 ieee80211_teardown_sdata(sdata);
1717 }
1718
1719 /*
1720 * Remove all interfaces, may only be called at hardware unregistration
1721 * time because it doesn't do RCU-safe list removals.
1722 */
1723 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1724 {
1725 struct ieee80211_sub_if_data *sdata, *tmp;
1726 LIST_HEAD(unreg_list);
1727 LIST_HEAD(wdev_list);
1728
1729 ASSERT_RTNL();
1730
1731 /*
1732 * Close all AP_VLAN interfaces first, as otherwise they
1733 * might be closed while the AP interface they belong to
1734 * is closed, causing unregister_netdevice_many() to crash.
1735 */
1736 list_for_each_entry(sdata, &local->interfaces, list)
1737 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1738 dev_close(sdata->dev);
1739
1740 mutex_lock(&local->iflist_mtx);
1741 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1742 list_del(&sdata->list);
1743
1744 if (sdata->dev)
1745 unregister_netdevice_queue(sdata->dev, &unreg_list);
1746 else
1747 list_add(&sdata->list, &wdev_list);
1748 }
1749 mutex_unlock(&local->iflist_mtx);
1750 unregister_netdevice_many(&unreg_list);
1751 list_del(&unreg_list);
1752
1753 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1754 list_del(&sdata->list);
1755 cfg80211_unregister_wdev(&sdata->wdev);
1756 kfree(sdata);
1757 }
1758 }
1759
1760 static int netdev_notify(struct notifier_block *nb,
1761 unsigned long state, void *ptr)
1762 {
1763 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1764 struct ieee80211_sub_if_data *sdata;
1765
1766 if (state != NETDEV_CHANGENAME)
1767 return 0;
1768
1769 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1770 return 0;
1771
1772 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1773 return 0;
1774
1775 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1776
1777 memcpy(sdata->name, dev->name, IFNAMSIZ);
1778
1779 ieee80211_debugfs_rename_netdev(sdata);
1780 return 0;
1781 }
1782
1783 static struct notifier_block mac80211_netdev_notifier = {
1784 .notifier_call = netdev_notify,
1785 };
1786
1787 int ieee80211_iface_init(void)
1788 {
1789 return register_netdevice_notifier(&mac80211_netdev_notifier);
1790 }
1791
1792 void ieee80211_iface_exit(void)
1793 {
1794 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1795 }
Linux with added FPC-III support