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Merge tag 'stable/for-linus-3.15-rc5-tag' of git://git.kernel.org/pub/scm/linux/kerne...
[deliverable/linux.git] / net / mac80211 / iface.c
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, scanning, active;
105 unsigned int led_trig_start = 0, led_trig_stop = 0;
106
107 lockdep_assert_held(&local->mtx);
108
109 active = force_active ||
110 !list_empty(&local->chanctx_list) ||
111 local->monitors;
112
113 working = !local->ops->remain_on_channel &&
114 !list_empty(&local->roc_list);
115
116 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
117 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
118
119 if (working || scanning)
120 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
121 else
122 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
123
124 if (active)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
128
129 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
130
131 if (working || scanning || active)
132 return __ieee80211_idle_off(local);
133 return __ieee80211_idle_on(local);
134 }
135
136 u32 ieee80211_idle_off(struct ieee80211_local *local)
137 {
138 return __ieee80211_recalc_idle(local, true);
139 }
140
141 void ieee80211_recalc_idle(struct ieee80211_local *local)
142 {
143 u32 change = __ieee80211_recalc_idle(local, false);
144 if (change)
145 ieee80211_hw_config(local, change);
146 }
147
148 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
149 {
150 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
151 return -EINVAL;
152
153 dev->mtu = new_mtu;
154 return 0;
155 }
156
157 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
158 bool check_dup)
159 {
160 struct ieee80211_local *local = sdata->local;
161 struct ieee80211_sub_if_data *iter;
162 u64 new, mask, tmp;
163 u8 *m;
164 int ret = 0;
165
166 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
167 return 0;
168
169 m = addr;
170 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
171 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
172 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
173
174 m = local->hw.wiphy->addr_mask;
175 mask = ((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 if (!check_dup)
180 return ret;
181
182 mutex_lock(&local->iflist_mtx);
183 list_for_each_entry(iter, &local->interfaces, list) {
184 if (iter == sdata)
185 continue;
186
187 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
188 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
189 continue;
190
191 m = iter->vif.addr;
192 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
193 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
194 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
195
196 if ((new & ~mask) != (tmp & ~mask)) {
197 ret = -EINVAL;
198 break;
199 }
200 }
201 mutex_unlock(&local->iflist_mtx);
202
203 return ret;
204 }
205
206 static int ieee80211_change_mac(struct net_device *dev, void *addr)
207 {
208 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
209 struct sockaddr *sa = addr;
210 bool check_dup = true;
211 int ret;
212
213 if (ieee80211_sdata_running(sdata))
214 return -EBUSY;
215
216 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
217 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
218 check_dup = false;
219
220 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
221 if (ret)
222 return ret;
223
224 ret = eth_mac_addr(dev, sa);
225
226 if (ret == 0)
227 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
228
229 return ret;
230 }
231
232 static inline int identical_mac_addr_allowed(int type1, int type2)
233 {
234 return type1 == NL80211_IFTYPE_MONITOR ||
235 type2 == NL80211_IFTYPE_MONITOR ||
236 type1 == NL80211_IFTYPE_P2P_DEVICE ||
237 type2 == NL80211_IFTYPE_P2P_DEVICE ||
238 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
239 (type1 == NL80211_IFTYPE_WDS &&
240 (type2 == NL80211_IFTYPE_WDS ||
241 type2 == NL80211_IFTYPE_AP)) ||
242 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
243 (type1 == NL80211_IFTYPE_AP_VLAN &&
244 (type2 == NL80211_IFTYPE_AP ||
245 type2 == NL80211_IFTYPE_AP_VLAN));
246 }
247
248 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
249 enum nl80211_iftype iftype)
250 {
251 struct ieee80211_local *local = sdata->local;
252 struct ieee80211_sub_if_data *nsdata;
253
254 ASSERT_RTNL();
255
256 /* we hold the RTNL here so can safely walk the list */
257 list_for_each_entry(nsdata, &local->interfaces, list) {
258 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
259 /*
260 * Allow only a single IBSS interface to be up at any
261 * time. This is restricted because beacon distribution
262 * cannot work properly if both are in the same IBSS.
263 *
264 * To remove this restriction we'd have to disallow them
265 * from setting the same SSID on different IBSS interfaces
266 * belonging to the same hardware. Then, however, we're
267 * faced with having to adopt two different TSF timers...
268 */
269 if (iftype == NL80211_IFTYPE_ADHOC &&
270 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
271 return -EBUSY;
272 /*
273 * will not add another interface while any channel
274 * switch is active.
275 */
276 if (nsdata->vif.csa_active)
277 return -EBUSY;
278
279 /*
280 * The remaining checks are only performed for interfaces
281 * with the same MAC address.
282 */
283 if (!ether_addr_equal(sdata->vif.addr,
284 nsdata->vif.addr))
285 continue;
286
287 /*
288 * check whether it may have the same address
289 */
290 if (!identical_mac_addr_allowed(iftype,
291 nsdata->vif.type))
292 return -ENOTUNIQ;
293
294 /*
295 * can only add VLANs to enabled APs
296 */
297 if (iftype == NL80211_IFTYPE_AP_VLAN &&
298 nsdata->vif.type == NL80211_IFTYPE_AP)
299 sdata->bss = &nsdata->u.ap;
300 }
301 }
302
303 return 0;
304 }
305
306 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
307 enum nl80211_iftype iftype)
308 {
309 int n_queues = sdata->local->hw.queues;
310 int i;
311
312 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
313 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
314 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
315 IEEE80211_INVAL_HW_QUEUE))
316 return -EINVAL;
317 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
318 n_queues))
319 return -EINVAL;
320 }
321 }
322
323 if ((iftype != NL80211_IFTYPE_AP &&
324 iftype != NL80211_IFTYPE_P2P_GO &&
325 iftype != NL80211_IFTYPE_MESH_POINT) ||
326 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
327 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
328 return 0;
329 }
330
331 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
332 return -EINVAL;
333
334 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
335 return -EINVAL;
336
337 return 0;
338 }
339
340 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
341 const int offset)
342 {
343 struct ieee80211_local *local = sdata->local;
344 u32 flags = sdata->u.mntr_flags;
345
346 #define ADJUST(_f, _s) do { \
347 if (flags & MONITOR_FLAG_##_f) \
348 local->fif_##_s += offset; \
349 } while (0)
350
351 ADJUST(FCSFAIL, fcsfail);
352 ADJUST(PLCPFAIL, plcpfail);
353 ADJUST(CONTROL, control);
354 ADJUST(CONTROL, pspoll);
355 ADJUST(OTHER_BSS, other_bss);
356
357 #undef ADJUST
358 }
359
360 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
361 {
362 struct ieee80211_local *local = sdata->local;
363 int i;
364
365 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
366 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
367 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
368 else if (local->hw.queues >= IEEE80211_NUM_ACS)
369 sdata->vif.hw_queue[i] = i;
370 else
371 sdata->vif.hw_queue[i] = 0;
372 }
373 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
374 }
375
376 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
377 {
378 struct ieee80211_sub_if_data *sdata;
379 int ret;
380
381 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
382 return 0;
383
384 ASSERT_RTNL();
385
386 if (local->monitor_sdata)
387 return 0;
388
389 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
390 if (!sdata)
391 return -ENOMEM;
392
393 /* set up data */
394 sdata->local = local;
395 sdata->vif.type = NL80211_IFTYPE_MONITOR;
396 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
397 wiphy_name(local->hw.wiphy));
398
399 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
400
401 ieee80211_set_default_queues(sdata);
402
403 ret = drv_add_interface(local, sdata);
404 if (WARN_ON(ret)) {
405 /* ok .. stupid driver, it asked for this! */
406 kfree(sdata);
407 return ret;
408 }
409
410 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
411 if (ret) {
412 kfree(sdata);
413 return ret;
414 }
415
416 mutex_lock(&local->iflist_mtx);
417 rcu_assign_pointer(local->monitor_sdata, sdata);
418 mutex_unlock(&local->iflist_mtx);
419
420 mutex_lock(&local->mtx);
421 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
422 IEEE80211_CHANCTX_EXCLUSIVE);
423 mutex_unlock(&local->mtx);
424 if (ret) {
425 mutex_lock(&local->iflist_mtx);
426 rcu_assign_pointer(local->monitor_sdata, NULL);
427 mutex_unlock(&local->iflist_mtx);
428 synchronize_net();
429 drv_remove_interface(local, sdata);
430 kfree(sdata);
431 return ret;
432 }
433
434 return 0;
435 }
436
437 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
438 {
439 struct ieee80211_sub_if_data *sdata;
440
441 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
442 return;
443
444 ASSERT_RTNL();
445
446 mutex_lock(&local->iflist_mtx);
447
448 sdata = rcu_dereference_protected(local->monitor_sdata,
449 lockdep_is_held(&local->iflist_mtx));
450 if (!sdata) {
451 mutex_unlock(&local->iflist_mtx);
452 return;
453 }
454
455 rcu_assign_pointer(local->monitor_sdata, NULL);
456 mutex_unlock(&local->iflist_mtx);
457
458 synchronize_net();
459
460 mutex_lock(&local->mtx);
461 ieee80211_vif_release_channel(sdata);
462 mutex_unlock(&local->mtx);
463
464 drv_remove_interface(local, sdata);
465
466 kfree(sdata);
467 }
468
469 /*
470 * NOTE: Be very careful when changing this function, it must NOT return
471 * an error on interface type changes that have been pre-checked, so most
472 * checks should be in ieee80211_check_concurrent_iface.
473 */
474 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
475 {
476 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
477 struct net_device *dev = wdev->netdev;
478 struct ieee80211_local *local = sdata->local;
479 struct sta_info *sta;
480 u32 changed = 0;
481 int res;
482 u32 hw_reconf_flags = 0;
483
484 switch (sdata->vif.type) {
485 case NL80211_IFTYPE_WDS:
486 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
487 return -ENOLINK;
488 break;
489 case NL80211_IFTYPE_AP_VLAN: {
490 struct ieee80211_sub_if_data *master;
491
492 if (!sdata->bss)
493 return -ENOLINK;
494
495 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
496
497 master = container_of(sdata->bss,
498 struct ieee80211_sub_if_data, u.ap);
499 sdata->control_port_protocol =
500 master->control_port_protocol;
501 sdata->control_port_no_encrypt =
502 master->control_port_no_encrypt;
503 sdata->vif.cab_queue = master->vif.cab_queue;
504 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
505 sizeof(sdata->vif.hw_queue));
506 break;
507 }
508 case NL80211_IFTYPE_AP:
509 sdata->bss = &sdata->u.ap;
510 break;
511 case NL80211_IFTYPE_MESH_POINT:
512 case NL80211_IFTYPE_STATION:
513 case NL80211_IFTYPE_MONITOR:
514 case NL80211_IFTYPE_ADHOC:
515 case NL80211_IFTYPE_P2P_DEVICE:
516 /* no special treatment */
517 break;
518 case NL80211_IFTYPE_UNSPECIFIED:
519 case NUM_NL80211_IFTYPES:
520 case NL80211_IFTYPE_P2P_CLIENT:
521 case NL80211_IFTYPE_P2P_GO:
522 /* cannot happen */
523 WARN_ON(1);
524 break;
525 }
526
527 if (local->open_count == 0) {
528 res = drv_start(local);
529 if (res)
530 goto err_del_bss;
531 /* we're brought up, everything changes */
532 hw_reconf_flags = ~0;
533 ieee80211_led_radio(local, true);
534 ieee80211_mod_tpt_led_trig(local,
535 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
536 }
537
538 /*
539 * Copy the hopefully now-present MAC address to
540 * this interface, if it has the special null one.
541 */
542 if (dev && is_zero_ether_addr(dev->dev_addr)) {
543 memcpy(dev->dev_addr,
544 local->hw.wiphy->perm_addr,
545 ETH_ALEN);
546 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
547
548 if (!is_valid_ether_addr(dev->dev_addr)) {
549 res = -EADDRNOTAVAIL;
550 goto err_stop;
551 }
552 }
553
554 switch (sdata->vif.type) {
555 case NL80211_IFTYPE_AP_VLAN:
556 /* no need to tell driver, but set carrier and chanctx */
557 if (rtnl_dereference(sdata->bss->beacon)) {
558 ieee80211_vif_vlan_copy_chanctx(sdata);
559 netif_carrier_on(dev);
560 } else {
561 netif_carrier_off(dev);
562 }
563 break;
564 case NL80211_IFTYPE_MONITOR:
565 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
566 local->cooked_mntrs++;
567 break;
568 }
569
570 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
571 res = drv_add_interface(local, sdata);
572 if (res)
573 goto err_stop;
574 } else if (local->monitors == 0 && local->open_count == 0) {
575 res = ieee80211_add_virtual_monitor(local);
576 if (res)
577 goto err_stop;
578 }
579
580 /* must be before the call to ieee80211_configure_filter */
581 local->monitors++;
582 if (local->monitors == 1) {
583 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
584 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
585 }
586
587 ieee80211_adjust_monitor_flags(sdata, 1);
588 ieee80211_configure_filter(local);
589 mutex_lock(&local->mtx);
590 ieee80211_recalc_idle(local);
591 mutex_unlock(&local->mtx);
592
593 netif_carrier_on(dev);
594 break;
595 default:
596 if (coming_up) {
597 ieee80211_del_virtual_monitor(local);
598
599 res = drv_add_interface(local, sdata);
600 if (res)
601 goto err_stop;
602 res = ieee80211_check_queues(sdata,
603 ieee80211_vif_type_p2p(&sdata->vif));
604 if (res)
605 goto err_del_interface;
606 }
607
608 if (sdata->vif.type == NL80211_IFTYPE_AP) {
609 local->fif_pspoll++;
610 local->fif_probe_req++;
611
612 ieee80211_configure_filter(local);
613 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
614 local->fif_probe_req++;
615 }
616
617 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
618 changed |= ieee80211_reset_erp_info(sdata);
619 ieee80211_bss_info_change_notify(sdata, changed);
620
621 switch (sdata->vif.type) {
622 case NL80211_IFTYPE_STATION:
623 case NL80211_IFTYPE_ADHOC:
624 case NL80211_IFTYPE_AP:
625 case NL80211_IFTYPE_MESH_POINT:
626 netif_carrier_off(dev);
627 break;
628 case NL80211_IFTYPE_WDS:
629 case NL80211_IFTYPE_P2P_DEVICE:
630 break;
631 default:
632 /* not reached */
633 WARN_ON(1);
634 }
635
636 /*
637 * set default queue parameters so drivers don't
638 * need to initialise the hardware if the hardware
639 * doesn't start up with sane defaults
640 */
641 ieee80211_set_wmm_default(sdata, true);
642 }
643
644 set_bit(SDATA_STATE_RUNNING, &sdata->state);
645
646 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
647 /* Create STA entry for the WDS peer */
648 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
649 GFP_KERNEL);
650 if (!sta) {
651 res = -ENOMEM;
652 goto err_del_interface;
653 }
654
655 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
656 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
657 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
658
659 res = sta_info_insert(sta);
660 if (res) {
661 /* STA has been freed */
662 goto err_del_interface;
663 }
664
665 rate_control_rate_init(sta);
666 netif_carrier_on(dev);
667 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
668 rcu_assign_pointer(local->p2p_sdata, sdata);
669 }
670
671 /*
672 * set_multicast_list will be invoked by the networking core
673 * which will check whether any increments here were done in
674 * error and sync them down to the hardware as filter flags.
675 */
676 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
677 atomic_inc(&local->iff_allmultis);
678
679 if (sdata->flags & IEEE80211_SDATA_PROMISC)
680 atomic_inc(&local->iff_promiscs);
681
682 if (coming_up)
683 local->open_count++;
684
685 if (hw_reconf_flags)
686 ieee80211_hw_config(local, hw_reconf_flags);
687
688 ieee80211_recalc_ps(local, -1);
689
690 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
691 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
692 /* XXX: for AP_VLAN, actually track AP queues */
693 netif_tx_start_all_queues(dev);
694 } else if (dev) {
695 unsigned long flags;
696 int n_acs = IEEE80211_NUM_ACS;
697 int ac;
698
699 if (local->hw.queues < IEEE80211_NUM_ACS)
700 n_acs = 1;
701
702 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
703 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
704 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
705 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
706 for (ac = 0; ac < n_acs; ac++) {
707 int ac_queue = sdata->vif.hw_queue[ac];
708
709 if (local->queue_stop_reasons[ac_queue] == 0 &&
710 skb_queue_empty(&local->pending[ac_queue]))
711 netif_start_subqueue(dev, ac);
712 }
713 }
714 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
715 }
716
717 return 0;
718 err_del_interface:
719 drv_remove_interface(local, sdata);
720 err_stop:
721 if (!local->open_count)
722 drv_stop(local);
723 err_del_bss:
724 sdata->bss = NULL;
725 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
726 list_del(&sdata->u.vlan.list);
727 /* might already be clear but that doesn't matter */
728 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
729 return res;
730 }
731
732 static int ieee80211_open(struct net_device *dev)
733 {
734 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
735 int err;
736
737 /* fail early if user set an invalid address */
738 if (!is_valid_ether_addr(dev->dev_addr))
739 return -EADDRNOTAVAIL;
740
741 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
742 if (err)
743 return err;
744
745 return ieee80211_do_open(&sdata->wdev, true);
746 }
747
748 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
749 bool going_down)
750 {
751 struct ieee80211_local *local = sdata->local;
752 unsigned long flags;
753 struct sk_buff *skb, *tmp;
754 u32 hw_reconf_flags = 0;
755 int i, flushed;
756 struct ps_data *ps;
757 struct cfg80211_chan_def chandef;
758
759 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
760
761 if (rcu_access_pointer(local->scan_sdata) == sdata)
762 ieee80211_scan_cancel(local);
763
764 /*
765 * Stop TX on this interface first.
766 */
767 if (sdata->dev)
768 netif_tx_stop_all_queues(sdata->dev);
769
770 ieee80211_roc_purge(local, sdata);
771
772 switch (sdata->vif.type) {
773 case NL80211_IFTYPE_STATION:
774 ieee80211_mgd_stop(sdata);
775 break;
776 case NL80211_IFTYPE_ADHOC:
777 ieee80211_ibss_stop(sdata);
778 break;
779 case NL80211_IFTYPE_AP:
780 cancel_work_sync(&sdata->u.ap.request_smps_work);
781 break;
782 default:
783 break;
784 }
785
786 /*
787 * Remove all stations associated with this interface.
788 *
789 * This must be done before calling ops->remove_interface()
790 * because otherwise we can later invoke ops->sta_notify()
791 * whenever the STAs are removed, and that invalidates driver
792 * assumptions about always getting a vif pointer that is valid
793 * (because if we remove a STA after ops->remove_interface()
794 * the driver will have removed the vif info already!)
795 *
796 * This is relevant only in WDS mode, in all other modes we've
797 * already removed all stations when disconnecting or similar,
798 * so warn otherwise.
799 */
800 flushed = sta_info_flush(sdata);
801 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
802 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
803
804 /* don't count this interface for promisc/allmulti while it is down */
805 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
806 atomic_dec(&local->iff_allmultis);
807
808 if (sdata->flags & IEEE80211_SDATA_PROMISC)
809 atomic_dec(&local->iff_promiscs);
810
811 if (sdata->vif.type == NL80211_IFTYPE_AP) {
812 local->fif_pspoll--;
813 local->fif_probe_req--;
814 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
815 local->fif_probe_req--;
816 }
817
818 if (sdata->dev) {
819 netif_addr_lock_bh(sdata->dev);
820 spin_lock_bh(&local->filter_lock);
821 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
822 sdata->dev->addr_len);
823 spin_unlock_bh(&local->filter_lock);
824 netif_addr_unlock_bh(sdata->dev);
825 }
826
827 del_timer_sync(&local->dynamic_ps_timer);
828 cancel_work_sync(&local->dynamic_ps_enable_work);
829
830 cancel_work_sync(&sdata->recalc_smps);
831 sdata_lock(sdata);
832 sdata->vif.csa_active = false;
833 sdata_unlock(sdata);
834 cancel_work_sync(&sdata->csa_finalize_work);
835
836 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
837
838 if (sdata->wdev.cac_started) {
839 chandef = sdata->vif.bss_conf.chandef;
840 WARN_ON(local->suspended);
841 mutex_lock(&local->mtx);
842 ieee80211_vif_release_channel(sdata);
843 mutex_unlock(&local->mtx);
844 cfg80211_cac_event(sdata->dev, &chandef,
845 NL80211_RADAR_CAC_ABORTED,
846 GFP_KERNEL);
847 }
848
849 /* APs need special treatment */
850 if (sdata->vif.type == NL80211_IFTYPE_AP) {
851 struct ieee80211_sub_if_data *vlan, *tmpsdata;
852
853 /* down all dependent devices, that is VLANs */
854 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
855 u.vlan.list)
856 dev_close(vlan->dev);
857 WARN_ON(!list_empty(&sdata->u.ap.vlans));
858 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
859 /* remove all packets in parent bc_buf pointing to this dev */
860 ps = &sdata->bss->ps;
861
862 spin_lock_irqsave(&ps->bc_buf.lock, flags);
863 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
864 if (skb->dev == sdata->dev) {
865 __skb_unlink(skb, &ps->bc_buf);
866 local->total_ps_buffered--;
867 ieee80211_free_txskb(&local->hw, skb);
868 }
869 }
870 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
871 }
872
873 if (going_down)
874 local->open_count--;
875
876 switch (sdata->vif.type) {
877 case NL80211_IFTYPE_AP_VLAN:
878 list_del(&sdata->u.vlan.list);
879 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
880 /* no need to tell driver */
881 break;
882 case NL80211_IFTYPE_MONITOR:
883 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
884 local->cooked_mntrs--;
885 break;
886 }
887
888 local->monitors--;
889 if (local->monitors == 0) {
890 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
891 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
892 }
893
894 ieee80211_adjust_monitor_flags(sdata, -1);
895 break;
896 case NL80211_IFTYPE_P2P_DEVICE:
897 /* relies on synchronize_rcu() below */
898 rcu_assign_pointer(local->p2p_sdata, NULL);
899 /* fall through */
900 default:
901 cancel_work_sync(&sdata->work);
902 /*
903 * When we get here, the interface is marked down.
904 * Free the remaining keys, if there are any
905 * (shouldn't be, except maybe in WDS mode?)
906 *
907 * Force the key freeing to always synchronize_net()
908 * to wait for the RX path in case it is using this
909 * interface enqueuing frames * at this very time on
910 * another CPU.
911 */
912 ieee80211_free_keys(sdata, true);
913
914 /* fall through */
915 case NL80211_IFTYPE_AP:
916 skb_queue_purge(&sdata->skb_queue);
917 }
918
919 sdata->bss = NULL;
920
921 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
922 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
923 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
925 if (info->control.vif == &sdata->vif) {
926 __skb_unlink(skb, &local->pending[i]);
927 ieee80211_free_txskb(&local->hw, skb);
928 }
929 }
930 }
931 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
932
933 if (local->open_count == 0)
934 ieee80211_clear_tx_pending(local);
935
936 /*
937 * If the interface goes down while suspended, presumably because
938 * the device was unplugged and that happens before our resume,
939 * then the driver is already unconfigured and the remainder of
940 * this function isn't needed.
941 * XXX: what about WoWLAN? If the device has software state, e.g.
942 * memory allocated, it might expect teardown commands from
943 * mac80211 here?
944 */
945 if (local->suspended) {
946 WARN_ON(local->wowlan);
947 WARN_ON(rtnl_dereference(local->monitor_sdata));
948 return;
949 }
950
951 switch (sdata->vif.type) {
952 case NL80211_IFTYPE_AP_VLAN:
953 break;
954 case NL80211_IFTYPE_MONITOR:
955 if (local->monitors == 0)
956 ieee80211_del_virtual_monitor(local);
957
958 mutex_lock(&local->mtx);
959 ieee80211_recalc_idle(local);
960 mutex_unlock(&local->mtx);
961
962 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
963 break;
964
965 /* fall through */
966 default:
967 if (going_down)
968 drv_remove_interface(local, sdata);
969 }
970
971 ieee80211_recalc_ps(local, -1);
972
973 if (local->open_count == 0) {
974 ieee80211_stop_device(local);
975
976 /* no reconfiguring after stop! */
977 return;
978 }
979
980 /* do after stop to avoid reconfiguring when we stop anyway */
981 ieee80211_configure_filter(local);
982 ieee80211_hw_config(local, hw_reconf_flags);
983
984 if (local->monitors == local->open_count)
985 ieee80211_add_virtual_monitor(local);
986 }
987
988 static int ieee80211_stop(struct net_device *dev)
989 {
990 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
991
992 ieee80211_do_stop(sdata, true);
993
994 return 0;
995 }
996
997 static void ieee80211_set_multicast_list(struct net_device *dev)
998 {
999 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1000 struct ieee80211_local *local = sdata->local;
1001 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1002
1003 allmulti = !!(dev->flags & IFF_ALLMULTI);
1004 promisc = !!(dev->flags & IFF_PROMISC);
1005 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1006 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1007
1008 if (allmulti != sdata_allmulti) {
1009 if (dev->flags & IFF_ALLMULTI)
1010 atomic_inc(&local->iff_allmultis);
1011 else
1012 atomic_dec(&local->iff_allmultis);
1013 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1014 }
1015
1016 if (promisc != sdata_promisc) {
1017 if (dev->flags & IFF_PROMISC)
1018 atomic_inc(&local->iff_promiscs);
1019 else
1020 atomic_dec(&local->iff_promiscs);
1021 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1022 }
1023 spin_lock_bh(&local->filter_lock);
1024 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1025 spin_unlock_bh(&local->filter_lock);
1026 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1027 }
1028
1029 /*
1030 * Called when the netdev is removed or, by the code below, before
1031 * the interface type changes.
1032 */
1033 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1034 {
1035 int i;
1036
1037 /* free extra data */
1038 ieee80211_free_keys(sdata, false);
1039
1040 ieee80211_debugfs_remove_netdev(sdata);
1041
1042 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1043 __skb_queue_purge(&sdata->fragments[i].skb_list);
1044 sdata->fragment_next = 0;
1045
1046 if (ieee80211_vif_is_mesh(&sdata->vif))
1047 mesh_rmc_free(sdata);
1048 }
1049
1050 static void ieee80211_uninit(struct net_device *dev)
1051 {
1052 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1053 }
1054
1055 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1056 struct sk_buff *skb,
1057 void *accel_priv,
1058 select_queue_fallback_t fallback)
1059 {
1060 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1061 }
1062
1063 static const struct net_device_ops ieee80211_dataif_ops = {
1064 .ndo_open = ieee80211_open,
1065 .ndo_stop = ieee80211_stop,
1066 .ndo_uninit = ieee80211_uninit,
1067 .ndo_start_xmit = ieee80211_subif_start_xmit,
1068 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1069 .ndo_change_mtu = ieee80211_change_mtu,
1070 .ndo_set_mac_address = ieee80211_change_mac,
1071 .ndo_select_queue = ieee80211_netdev_select_queue,
1072 };
1073
1074 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1075 struct sk_buff *skb,
1076 void *accel_priv,
1077 select_queue_fallback_t fallback)
1078 {
1079 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080 struct ieee80211_local *local = sdata->local;
1081 struct ieee80211_hdr *hdr;
1082 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1083
1084 if (local->hw.queues < IEEE80211_NUM_ACS)
1085 return 0;
1086
1087 if (skb->len < 4 ||
1088 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1089 return 0; /* doesn't matter, frame will be dropped */
1090
1091 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1092
1093 return ieee80211_select_queue_80211(sdata, skb, hdr);
1094 }
1095
1096 static const struct net_device_ops ieee80211_monitorif_ops = {
1097 .ndo_open = ieee80211_open,
1098 .ndo_stop = ieee80211_stop,
1099 .ndo_uninit = ieee80211_uninit,
1100 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1101 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1102 .ndo_change_mtu = ieee80211_change_mtu,
1103 .ndo_set_mac_address = ieee80211_change_mac,
1104 .ndo_select_queue = ieee80211_monitor_select_queue,
1105 };
1106
1107 static void ieee80211_if_setup(struct net_device *dev)
1108 {
1109 ether_setup(dev);
1110 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1111 dev->netdev_ops = &ieee80211_dataif_ops;
1112 dev->destructor = free_netdev;
1113 }
1114
1115 static void ieee80211_iface_work(struct work_struct *work)
1116 {
1117 struct ieee80211_sub_if_data *sdata =
1118 container_of(work, struct ieee80211_sub_if_data, work);
1119 struct ieee80211_local *local = sdata->local;
1120 struct sk_buff *skb;
1121 struct sta_info *sta;
1122 struct ieee80211_ra_tid *ra_tid;
1123
1124 if (!ieee80211_sdata_running(sdata))
1125 return;
1126
1127 if (local->scanning)
1128 return;
1129
1130 /*
1131 * ieee80211_queue_work() should have picked up most cases,
1132 * here we'll pick the rest.
1133 */
1134 if (WARN(local->suspended,
1135 "interface work scheduled while going to suspend\n"))
1136 return;
1137
1138 /* first process frames */
1139 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1140 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1141
1142 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1143 ra_tid = (void *)&skb->cb;
1144 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1145 ra_tid->tid);
1146 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1147 ra_tid = (void *)&skb->cb;
1148 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1149 ra_tid->tid);
1150 } else if (ieee80211_is_action(mgmt->frame_control) &&
1151 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1152 int len = skb->len;
1153
1154 mutex_lock(&local->sta_mtx);
1155 sta = sta_info_get_bss(sdata, mgmt->sa);
1156 if (sta) {
1157 switch (mgmt->u.action.u.addba_req.action_code) {
1158 case WLAN_ACTION_ADDBA_REQ:
1159 ieee80211_process_addba_request(
1160 local, sta, mgmt, len);
1161 break;
1162 case WLAN_ACTION_ADDBA_RESP:
1163 ieee80211_process_addba_resp(local, sta,
1164 mgmt, len);
1165 break;
1166 case WLAN_ACTION_DELBA:
1167 ieee80211_process_delba(sdata, sta,
1168 mgmt, len);
1169 break;
1170 default:
1171 WARN_ON(1);
1172 break;
1173 }
1174 }
1175 mutex_unlock(&local->sta_mtx);
1176 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1177 struct ieee80211_hdr *hdr = (void *)mgmt;
1178 /*
1179 * So the frame isn't mgmt, but frame_control
1180 * is at the right place anyway, of course, so
1181 * the if statement is correct.
1182 *
1183 * Warn if we have other data frame types here,
1184 * they must not get here.
1185 */
1186 WARN_ON(hdr->frame_control &
1187 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1188 WARN_ON(!(hdr->seq_ctrl &
1189 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1190 /*
1191 * This was a fragment of a frame, received while
1192 * a block-ack session was active. That cannot be
1193 * right, so terminate the session.
1194 */
1195 mutex_lock(&local->sta_mtx);
1196 sta = sta_info_get_bss(sdata, mgmt->sa);
1197 if (sta) {
1198 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1199 IEEE80211_QOS_CTL_TID_MASK;
1200
1201 __ieee80211_stop_rx_ba_session(
1202 sta, tid, WLAN_BACK_RECIPIENT,
1203 WLAN_REASON_QSTA_REQUIRE_SETUP,
1204 true);
1205 }
1206 mutex_unlock(&local->sta_mtx);
1207 } else switch (sdata->vif.type) {
1208 case NL80211_IFTYPE_STATION:
1209 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1210 break;
1211 case NL80211_IFTYPE_ADHOC:
1212 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1213 break;
1214 case NL80211_IFTYPE_MESH_POINT:
1215 if (!ieee80211_vif_is_mesh(&sdata->vif))
1216 break;
1217 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1218 break;
1219 default:
1220 WARN(1, "frame for unexpected interface type");
1221 break;
1222 }
1223
1224 kfree_skb(skb);
1225 }
1226
1227 /* then other type-dependent work */
1228 switch (sdata->vif.type) {
1229 case NL80211_IFTYPE_STATION:
1230 ieee80211_sta_work(sdata);
1231 break;
1232 case NL80211_IFTYPE_ADHOC:
1233 ieee80211_ibss_work(sdata);
1234 break;
1235 case NL80211_IFTYPE_MESH_POINT:
1236 if (!ieee80211_vif_is_mesh(&sdata->vif))
1237 break;
1238 ieee80211_mesh_work(sdata);
1239 break;
1240 default:
1241 break;
1242 }
1243 }
1244
1245 static void ieee80211_recalc_smps_work(struct work_struct *work)
1246 {
1247 struct ieee80211_sub_if_data *sdata =
1248 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1249
1250 ieee80211_recalc_smps(sdata);
1251 }
1252
1253 /*
1254 * Helper function to initialise an interface to a specific type.
1255 */
1256 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1257 enum nl80211_iftype type)
1258 {
1259 /* clear type-dependent union */
1260 memset(&sdata->u, 0, sizeof(sdata->u));
1261
1262 /* and set some type-dependent values */
1263 sdata->vif.type = type;
1264 sdata->vif.p2p = false;
1265 sdata->wdev.iftype = type;
1266
1267 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1268 sdata->control_port_no_encrypt = false;
1269 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1270
1271 sdata->noack_map = 0;
1272
1273 /* only monitor/p2p-device differ */
1274 if (sdata->dev) {
1275 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1276 sdata->dev->type = ARPHRD_ETHER;
1277 }
1278
1279 skb_queue_head_init(&sdata->skb_queue);
1280 INIT_WORK(&sdata->work, ieee80211_iface_work);
1281 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1282 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1283
1284 switch (type) {
1285 case NL80211_IFTYPE_P2P_GO:
1286 type = NL80211_IFTYPE_AP;
1287 sdata->vif.type = type;
1288 sdata->vif.p2p = true;
1289 /* fall through */
1290 case NL80211_IFTYPE_AP:
1291 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1292 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1293 INIT_WORK(&sdata->u.ap.request_smps_work,
1294 ieee80211_request_smps_ap_work);
1295 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1296 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1297 break;
1298 case NL80211_IFTYPE_P2P_CLIENT:
1299 type = NL80211_IFTYPE_STATION;
1300 sdata->vif.type = type;
1301 sdata->vif.p2p = true;
1302 /* fall through */
1303 case NL80211_IFTYPE_STATION:
1304 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1305 ieee80211_sta_setup_sdata(sdata);
1306 break;
1307 case NL80211_IFTYPE_ADHOC:
1308 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1309 ieee80211_ibss_setup_sdata(sdata);
1310 break;
1311 case NL80211_IFTYPE_MESH_POINT:
1312 if (ieee80211_vif_is_mesh(&sdata->vif))
1313 ieee80211_mesh_init_sdata(sdata);
1314 break;
1315 case NL80211_IFTYPE_MONITOR:
1316 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1317 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1318 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1319 MONITOR_FLAG_OTHER_BSS;
1320 break;
1321 case NL80211_IFTYPE_WDS:
1322 sdata->vif.bss_conf.bssid = NULL;
1323 break;
1324 case NL80211_IFTYPE_AP_VLAN:
1325 case NL80211_IFTYPE_P2P_DEVICE:
1326 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1327 break;
1328 case NL80211_IFTYPE_UNSPECIFIED:
1329 case NUM_NL80211_IFTYPES:
1330 BUG();
1331 break;
1332 }
1333
1334 ieee80211_debugfs_add_netdev(sdata);
1335 }
1336
1337 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1338 enum nl80211_iftype type)
1339 {
1340 struct ieee80211_local *local = sdata->local;
1341 int ret, err;
1342 enum nl80211_iftype internal_type = type;
1343 bool p2p = false;
1344
1345 ASSERT_RTNL();
1346
1347 if (!local->ops->change_interface)
1348 return -EBUSY;
1349
1350 switch (sdata->vif.type) {
1351 case NL80211_IFTYPE_AP:
1352 case NL80211_IFTYPE_STATION:
1353 case NL80211_IFTYPE_ADHOC:
1354 /*
1355 * Could maybe also all others here?
1356 * Just not sure how that interacts
1357 * with the RX/config path e.g. for
1358 * mesh.
1359 */
1360 break;
1361 default:
1362 return -EBUSY;
1363 }
1364
1365 switch (type) {
1366 case NL80211_IFTYPE_AP:
1367 case NL80211_IFTYPE_STATION:
1368 case NL80211_IFTYPE_ADHOC:
1369 /*
1370 * Could probably support everything
1371 * but WDS here (WDS do_open can fail
1372 * under memory pressure, which this
1373 * code isn't prepared to handle).
1374 */
1375 break;
1376 case NL80211_IFTYPE_P2P_CLIENT:
1377 p2p = true;
1378 internal_type = NL80211_IFTYPE_STATION;
1379 break;
1380 case NL80211_IFTYPE_P2P_GO:
1381 p2p = true;
1382 internal_type = NL80211_IFTYPE_AP;
1383 break;
1384 default:
1385 return -EBUSY;
1386 }
1387
1388 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1389 if (ret)
1390 return ret;
1391
1392 ieee80211_do_stop(sdata, false);
1393
1394 ieee80211_teardown_sdata(sdata);
1395
1396 ret = drv_change_interface(local, sdata, internal_type, p2p);
1397 if (ret)
1398 type = ieee80211_vif_type_p2p(&sdata->vif);
1399
1400 /*
1401 * Ignore return value here, there's not much we can do since
1402 * the driver changed the interface type internally already.
1403 * The warnings will hopefully make driver authors fix it :-)
1404 */
1405 ieee80211_check_queues(sdata, type);
1406
1407 ieee80211_setup_sdata(sdata, type);
1408
1409 err = ieee80211_do_open(&sdata->wdev, false);
1410 WARN(err, "type change: do_open returned %d", err);
1411
1412 return ret;
1413 }
1414
1415 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1416 enum nl80211_iftype type)
1417 {
1418 int ret;
1419
1420 ASSERT_RTNL();
1421
1422 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1423 return 0;
1424
1425 if (ieee80211_sdata_running(sdata)) {
1426 ret = ieee80211_runtime_change_iftype(sdata, type);
1427 if (ret)
1428 return ret;
1429 } else {
1430 /* Purge and reset type-dependent state. */
1431 ieee80211_teardown_sdata(sdata);
1432 ieee80211_setup_sdata(sdata, type);
1433 }
1434
1435 /* reset some values that shouldn't be kept across type changes */
1436 sdata->drop_unencrypted = 0;
1437 if (type == NL80211_IFTYPE_STATION)
1438 sdata->u.mgd.use_4addr = false;
1439
1440 return 0;
1441 }
1442
1443 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1444 u8 *perm_addr, enum nl80211_iftype type)
1445 {
1446 struct ieee80211_sub_if_data *sdata;
1447 u64 mask, start, addr, val, inc;
1448 u8 *m;
1449 u8 tmp_addr[ETH_ALEN];
1450 int i;
1451
1452 /* default ... something at least */
1453 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1454
1455 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1456 local->hw.wiphy->n_addresses <= 1)
1457 return;
1458
1459 mutex_lock(&local->iflist_mtx);
1460
1461 switch (type) {
1462 case NL80211_IFTYPE_MONITOR:
1463 /* doesn't matter */
1464 break;
1465 case NL80211_IFTYPE_WDS:
1466 case NL80211_IFTYPE_AP_VLAN:
1467 /* match up with an AP interface */
1468 list_for_each_entry(sdata, &local->interfaces, list) {
1469 if (sdata->vif.type != NL80211_IFTYPE_AP)
1470 continue;
1471 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1472 break;
1473 }
1474 /* keep default if no AP interface present */
1475 break;
1476 case NL80211_IFTYPE_P2P_CLIENT:
1477 case NL80211_IFTYPE_P2P_GO:
1478 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1479 list_for_each_entry(sdata, &local->interfaces, list) {
1480 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1481 continue;
1482 if (!ieee80211_sdata_running(sdata))
1483 continue;
1484 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1485 goto out_unlock;
1486 }
1487 }
1488 /* otherwise fall through */
1489 default:
1490 /* assign a new address if possible -- try n_addresses first */
1491 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1492 bool used = false;
1493
1494 list_for_each_entry(sdata, &local->interfaces, list) {
1495 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1496 sdata->vif.addr)) {
1497 used = true;
1498 break;
1499 }
1500 }
1501
1502 if (!used) {
1503 memcpy(perm_addr,
1504 local->hw.wiphy->addresses[i].addr,
1505 ETH_ALEN);
1506 break;
1507 }
1508 }
1509
1510 /* try mask if available */
1511 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1512 break;
1513
1514 m = local->hw.wiphy->addr_mask;
1515 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1516 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1517 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1518
1519 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1520 /* not a contiguous mask ... not handled now! */
1521 pr_info("not contiguous\n");
1522 break;
1523 }
1524
1525 /*
1526 * Pick address of existing interface in case user changed
1527 * MAC address manually, default to perm_addr.
1528 */
1529 m = local->hw.wiphy->perm_addr;
1530 list_for_each_entry(sdata, &local->interfaces, list) {
1531 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1532 continue;
1533 m = sdata->vif.addr;
1534 break;
1535 }
1536 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1537 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1538 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1539
1540 inc = 1ULL<<__ffs64(mask);
1541 val = (start & mask);
1542 addr = (start & ~mask) | (val & mask);
1543 do {
1544 bool used = false;
1545
1546 tmp_addr[5] = addr >> 0*8;
1547 tmp_addr[4] = addr >> 1*8;
1548 tmp_addr[3] = addr >> 2*8;
1549 tmp_addr[2] = addr >> 3*8;
1550 tmp_addr[1] = addr >> 4*8;
1551 tmp_addr[0] = addr >> 5*8;
1552
1553 val += inc;
1554
1555 list_for_each_entry(sdata, &local->interfaces, list) {
1556 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1557 used = true;
1558 break;
1559 }
1560 }
1561
1562 if (!used) {
1563 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1564 break;
1565 }
1566 addr = (start & ~mask) | (val & mask);
1567 } while (addr != start);
1568
1569 break;
1570 }
1571
1572 out_unlock:
1573 mutex_unlock(&local->iflist_mtx);
1574 }
1575
1576 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1577 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1578 struct vif_params *params)
1579 {
1580 struct net_device *ndev = NULL;
1581 struct ieee80211_sub_if_data *sdata = NULL;
1582 int ret, i;
1583 int txqs = 1;
1584
1585 ASSERT_RTNL();
1586
1587 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1588 struct wireless_dev *wdev;
1589
1590 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1591 GFP_KERNEL);
1592 if (!sdata)
1593 return -ENOMEM;
1594 wdev = &sdata->wdev;
1595
1596 sdata->dev = NULL;
1597 strlcpy(sdata->name, name, IFNAMSIZ);
1598 ieee80211_assign_perm_addr(local, wdev->address, type);
1599 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1600 } else {
1601 if (local->hw.queues >= IEEE80211_NUM_ACS)
1602 txqs = IEEE80211_NUM_ACS;
1603
1604 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1605 local->hw.vif_data_size,
1606 name, ieee80211_if_setup, txqs, 1);
1607 if (!ndev)
1608 return -ENOMEM;
1609 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1610
1611 ndev->needed_headroom = local->tx_headroom +
1612 4*6 /* four MAC addresses */
1613 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1614 + 6 /* mesh */
1615 + 8 /* rfc1042/bridge tunnel */
1616 - ETH_HLEN /* ethernet hard_header_len */
1617 + IEEE80211_ENCRYPT_HEADROOM;
1618 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1619
1620 ret = dev_alloc_name(ndev, ndev->name);
1621 if (ret < 0) {
1622 free_netdev(ndev);
1623 return ret;
1624 }
1625
1626 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1627 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1628 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1629
1630 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1631 sdata = netdev_priv(ndev);
1632 ndev->ieee80211_ptr = &sdata->wdev;
1633 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1634 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1635
1636 sdata->dev = ndev;
1637 }
1638
1639 /* initialise type-independent data */
1640 sdata->wdev.wiphy = local->hw.wiphy;
1641 sdata->local = local;
1642
1643 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1644 skb_queue_head_init(&sdata->fragments[i].skb_list);
1645
1646 INIT_LIST_HEAD(&sdata->key_list);
1647
1648 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1649 ieee80211_dfs_cac_timer_work);
1650 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1651 ieee80211_delayed_tailroom_dec);
1652
1653 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1654 struct ieee80211_supported_band *sband;
1655 sband = local->hw.wiphy->bands[i];
1656 sdata->rc_rateidx_mask[i] =
1657 sband ? (1 << sband->n_bitrates) - 1 : 0;
1658 if (sband)
1659 memcpy(sdata->rc_rateidx_mcs_mask[i],
1660 sband->ht_cap.mcs.rx_mask,
1661 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1662 else
1663 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1664 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1665 }
1666
1667 ieee80211_set_default_queues(sdata);
1668
1669 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1670 sdata->user_power_level = local->user_power_level;
1671
1672 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1673
1674 /* setup type-dependent data */
1675 ieee80211_setup_sdata(sdata, type);
1676
1677 if (ndev) {
1678 if (params) {
1679 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1680 if (type == NL80211_IFTYPE_STATION)
1681 sdata->u.mgd.use_4addr = params->use_4addr;
1682 }
1683
1684 ndev->features |= local->hw.netdev_features;
1685
1686 ret = register_netdevice(ndev);
1687 if (ret) {
1688 free_netdev(ndev);
1689 return ret;
1690 }
1691 }
1692
1693 mutex_lock(&local->iflist_mtx);
1694 list_add_tail_rcu(&sdata->list, &local->interfaces);
1695 mutex_unlock(&local->iflist_mtx);
1696
1697 if (new_wdev)
1698 *new_wdev = &sdata->wdev;
1699
1700 return 0;
1701 }
1702
1703 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1704 {
1705 ASSERT_RTNL();
1706
1707 mutex_lock(&sdata->local->iflist_mtx);
1708 list_del_rcu(&sdata->list);
1709 mutex_unlock(&sdata->local->iflist_mtx);
1710
1711 synchronize_rcu();
1712
1713 if (sdata->dev) {
1714 unregister_netdevice(sdata->dev);
1715 } else {
1716 cfg80211_unregister_wdev(&sdata->wdev);
1717 kfree(sdata);
1718 }
1719 }
1720
1721 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1722 {
1723 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1724 return;
1725 ieee80211_do_stop(sdata, true);
1726 ieee80211_teardown_sdata(sdata);
1727 }
1728
1729 /*
1730 * Remove all interfaces, may only be called at hardware unregistration
1731 * time because it doesn't do RCU-safe list removals.
1732 */
1733 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1734 {
1735 struct ieee80211_sub_if_data *sdata, *tmp;
1736 LIST_HEAD(unreg_list);
1737 LIST_HEAD(wdev_list);
1738
1739 ASSERT_RTNL();
1740
1741 /*
1742 * Close all AP_VLAN interfaces first, as otherwise they
1743 * might be closed while the AP interface they belong to
1744 * is closed, causing unregister_netdevice_many() to crash.
1745 */
1746 list_for_each_entry(sdata, &local->interfaces, list)
1747 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1748 dev_close(sdata->dev);
1749
1750 mutex_lock(&local->iflist_mtx);
1751 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1752 list_del(&sdata->list);
1753
1754 if (sdata->dev)
1755 unregister_netdevice_queue(sdata->dev, &unreg_list);
1756 else
1757 list_add(&sdata->list, &wdev_list);
1758 }
1759 mutex_unlock(&local->iflist_mtx);
1760 unregister_netdevice_many(&unreg_list);
1761 list_del(&unreg_list);
1762
1763 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1764 list_del(&sdata->list);
1765 cfg80211_unregister_wdev(&sdata->wdev);
1766 kfree(sdata);
1767 }
1768 }
1769
1770 static int netdev_notify(struct notifier_block *nb,
1771 unsigned long state, void *ptr)
1772 {
1773 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1774 struct ieee80211_sub_if_data *sdata;
1775
1776 if (state != NETDEV_CHANGENAME)
1777 return 0;
1778
1779 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1780 return 0;
1781
1782 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1783 return 0;
1784
1785 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1786
1787 memcpy(sdata->name, dev->name, IFNAMSIZ);
1788
1789 ieee80211_debugfs_rename_netdev(sdata);
1790 return 0;
1791 }
1792
1793 static struct notifier_block mac80211_netdev_notifier = {
1794 .notifier_call = netdev_notify,
1795 };
1796
1797 int ieee80211_iface_init(void)
1798 {
1799 return register_netdevice_notifier(&mac80211_netdev_notifier);
1800 }
1801
1802 void ieee80211_iface_exit(void)
1803 {
1804 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1805 }
Linux kernel - Deliverables
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