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Merge tag 'nfc-next-3.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo...
[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 int ret;
254
255 ASSERT_RTNL();
256
257 /* we hold the RTNL here so can safely walk the list */
258 list_for_each_entry(nsdata, &local->interfaces, list) {
259 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
260 /*
261 * Allow only a single IBSS interface to be up at any
262 * time. This is restricted because beacon distribution
263 * cannot work properly if both are in the same IBSS.
264 *
265 * To remove this restriction we'd have to disallow them
266 * from setting the same SSID on different IBSS interfaces
267 * belonging to the same hardware. Then, however, we're
268 * faced with having to adopt two different TSF timers...
269 */
270 if (iftype == NL80211_IFTYPE_ADHOC &&
271 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
272 return -EBUSY;
273 /*
274 * will not add another interface while any channel
275 * switch is active.
276 */
277 if (nsdata->vif.csa_active)
278 return -EBUSY;
279
280 /*
281 * The remaining checks are only performed for interfaces
282 * with the same MAC address.
283 */
284 if (!ether_addr_equal(sdata->vif.addr,
285 nsdata->vif.addr))
286 continue;
287
288 /*
289 * check whether it may have the same address
290 */
291 if (!identical_mac_addr_allowed(iftype,
292 nsdata->vif.type))
293 return -ENOTUNIQ;
294
295 /*
296 * can only add VLANs to enabled APs
297 */
298 if (iftype == NL80211_IFTYPE_AP_VLAN &&
299 nsdata->vif.type == NL80211_IFTYPE_AP)
300 sdata->bss = &nsdata->u.ap;
301 }
302 }
303
304 mutex_lock(&local->chanctx_mtx);
305 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
306 mutex_unlock(&local->chanctx_mtx);
307 return ret;
308 }
309
310 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
311 enum nl80211_iftype iftype)
312 {
313 int n_queues = sdata->local->hw.queues;
314 int i;
315
316 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
317 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
318 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
319 IEEE80211_INVAL_HW_QUEUE))
320 return -EINVAL;
321 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
322 n_queues))
323 return -EINVAL;
324 }
325 }
326
327 if ((iftype != NL80211_IFTYPE_AP &&
328 iftype != NL80211_IFTYPE_P2P_GO &&
329 iftype != NL80211_IFTYPE_MESH_POINT) ||
330 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
331 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
332 return 0;
333 }
334
335 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
336 return -EINVAL;
337
338 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
339 return -EINVAL;
340
341 return 0;
342 }
343
344 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
345 const int offset)
346 {
347 struct ieee80211_local *local = sdata->local;
348 u32 flags = sdata->u.mntr_flags;
349
350 #define ADJUST(_f, _s) do { \
351 if (flags & MONITOR_FLAG_##_f) \
352 local->fif_##_s += offset; \
353 } while (0)
354
355 ADJUST(FCSFAIL, fcsfail);
356 ADJUST(PLCPFAIL, plcpfail);
357 ADJUST(CONTROL, control);
358 ADJUST(CONTROL, pspoll);
359 ADJUST(OTHER_BSS, other_bss);
360
361 #undef ADJUST
362 }
363
364 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
365 {
366 struct ieee80211_local *local = sdata->local;
367 int i;
368
369 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
370 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
371 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
372 else if (local->hw.queues >= IEEE80211_NUM_ACS)
373 sdata->vif.hw_queue[i] = i;
374 else
375 sdata->vif.hw_queue[i] = 0;
376 }
377 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
378 }
379
380 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
381 {
382 struct ieee80211_sub_if_data *sdata;
383 int ret;
384
385 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
386 return 0;
387
388 ASSERT_RTNL();
389
390 if (local->monitor_sdata)
391 return 0;
392
393 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
394 if (!sdata)
395 return -ENOMEM;
396
397 /* set up data */
398 sdata->local = local;
399 sdata->vif.type = NL80211_IFTYPE_MONITOR;
400 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
401 wiphy_name(local->hw.wiphy));
402
403 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
404
405 ieee80211_set_default_queues(sdata);
406
407 ret = drv_add_interface(local, sdata);
408 if (WARN_ON(ret)) {
409 /* ok .. stupid driver, it asked for this! */
410 kfree(sdata);
411 return ret;
412 }
413
414 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
415 if (ret) {
416 kfree(sdata);
417 return ret;
418 }
419
420 mutex_lock(&local->iflist_mtx);
421 rcu_assign_pointer(local->monitor_sdata, sdata);
422 mutex_unlock(&local->iflist_mtx);
423
424 mutex_lock(&local->mtx);
425 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
426 IEEE80211_CHANCTX_EXCLUSIVE);
427 mutex_unlock(&local->mtx);
428 if (ret) {
429 mutex_lock(&local->iflist_mtx);
430 RCU_INIT_POINTER(local->monitor_sdata, NULL);
431 mutex_unlock(&local->iflist_mtx);
432 synchronize_net();
433 drv_remove_interface(local, sdata);
434 kfree(sdata);
435 return ret;
436 }
437
438 return 0;
439 }
440
441 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
442 {
443 struct ieee80211_sub_if_data *sdata;
444
445 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
446 return;
447
448 ASSERT_RTNL();
449
450 mutex_lock(&local->iflist_mtx);
451
452 sdata = rcu_dereference_protected(local->monitor_sdata,
453 lockdep_is_held(&local->iflist_mtx));
454 if (!sdata) {
455 mutex_unlock(&local->iflist_mtx);
456 return;
457 }
458
459 RCU_INIT_POINTER(local->monitor_sdata, NULL);
460 mutex_unlock(&local->iflist_mtx);
461
462 synchronize_net();
463
464 mutex_lock(&local->mtx);
465 ieee80211_vif_release_channel(sdata);
466 mutex_unlock(&local->mtx);
467
468 drv_remove_interface(local, sdata);
469
470 kfree(sdata);
471 }
472
473 /*
474 * NOTE: Be very careful when changing this function, it must NOT return
475 * an error on interface type changes that have been pre-checked, so most
476 * checks should be in ieee80211_check_concurrent_iface.
477 */
478 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
479 {
480 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
481 struct net_device *dev = wdev->netdev;
482 struct ieee80211_local *local = sdata->local;
483 struct sta_info *sta;
484 u32 changed = 0;
485 int res;
486 u32 hw_reconf_flags = 0;
487
488 switch (sdata->vif.type) {
489 case NL80211_IFTYPE_WDS:
490 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
491 return -ENOLINK;
492 break;
493 case NL80211_IFTYPE_AP_VLAN: {
494 struct ieee80211_sub_if_data *master;
495
496 if (!sdata->bss)
497 return -ENOLINK;
498
499 mutex_lock(&local->mtx);
500 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
501 mutex_unlock(&local->mtx);
502
503 master = container_of(sdata->bss,
504 struct ieee80211_sub_if_data, u.ap);
505 sdata->control_port_protocol =
506 master->control_port_protocol;
507 sdata->control_port_no_encrypt =
508 master->control_port_no_encrypt;
509 sdata->vif.cab_queue = master->vif.cab_queue;
510 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
511 sizeof(sdata->vif.hw_queue));
512 break;
513 }
514 case NL80211_IFTYPE_AP:
515 sdata->bss = &sdata->u.ap;
516 break;
517 case NL80211_IFTYPE_MESH_POINT:
518 case NL80211_IFTYPE_STATION:
519 case NL80211_IFTYPE_MONITOR:
520 case NL80211_IFTYPE_ADHOC:
521 case NL80211_IFTYPE_P2P_DEVICE:
522 /* no special treatment */
523 break;
524 case NL80211_IFTYPE_UNSPECIFIED:
525 case NUM_NL80211_IFTYPES:
526 case NL80211_IFTYPE_P2P_CLIENT:
527 case NL80211_IFTYPE_P2P_GO:
528 /* cannot happen */
529 WARN_ON(1);
530 break;
531 }
532
533 if (local->open_count == 0) {
534 res = drv_start(local);
535 if (res)
536 goto err_del_bss;
537 /* we're brought up, everything changes */
538 hw_reconf_flags = ~0;
539 ieee80211_led_radio(local, true);
540 ieee80211_mod_tpt_led_trig(local,
541 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
542 }
543
544 /*
545 * Copy the hopefully now-present MAC address to
546 * this interface, if it has the special null one.
547 */
548 if (dev && is_zero_ether_addr(dev->dev_addr)) {
549 memcpy(dev->dev_addr,
550 local->hw.wiphy->perm_addr,
551 ETH_ALEN);
552 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
553
554 if (!is_valid_ether_addr(dev->dev_addr)) {
555 res = -EADDRNOTAVAIL;
556 goto err_stop;
557 }
558 }
559
560 switch (sdata->vif.type) {
561 case NL80211_IFTYPE_AP_VLAN:
562 /* no need to tell driver, but set carrier and chanctx */
563 if (rtnl_dereference(sdata->bss->beacon)) {
564 ieee80211_vif_vlan_copy_chanctx(sdata);
565 netif_carrier_on(dev);
566 } else {
567 netif_carrier_off(dev);
568 }
569 break;
570 case NL80211_IFTYPE_MONITOR:
571 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
572 local->cooked_mntrs++;
573 break;
574 }
575
576 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
577 res = drv_add_interface(local, sdata);
578 if (res)
579 goto err_stop;
580 } else if (local->monitors == 0 && local->open_count == 0) {
581 res = ieee80211_add_virtual_monitor(local);
582 if (res)
583 goto err_stop;
584 }
585
586 /* must be before the call to ieee80211_configure_filter */
587 local->monitors++;
588 if (local->monitors == 1) {
589 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
590 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
591 }
592
593 ieee80211_adjust_monitor_flags(sdata, 1);
594 ieee80211_configure_filter(local);
595 mutex_lock(&local->mtx);
596 ieee80211_recalc_idle(local);
597 mutex_unlock(&local->mtx);
598
599 netif_carrier_on(dev);
600 break;
601 default:
602 if (coming_up) {
603 ieee80211_del_virtual_monitor(local);
604
605 res = drv_add_interface(local, sdata);
606 if (res)
607 goto err_stop;
608 res = ieee80211_check_queues(sdata,
609 ieee80211_vif_type_p2p(&sdata->vif));
610 if (res)
611 goto err_del_interface;
612 }
613
614 if (sdata->vif.type == NL80211_IFTYPE_AP) {
615 local->fif_pspoll++;
616 local->fif_probe_req++;
617
618 ieee80211_configure_filter(local);
619 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
620 local->fif_probe_req++;
621 }
622
623 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
624 changed |= ieee80211_reset_erp_info(sdata);
625 ieee80211_bss_info_change_notify(sdata, changed);
626
627 switch (sdata->vif.type) {
628 case NL80211_IFTYPE_STATION:
629 case NL80211_IFTYPE_ADHOC:
630 case NL80211_IFTYPE_AP:
631 case NL80211_IFTYPE_MESH_POINT:
632 netif_carrier_off(dev);
633 break;
634 case NL80211_IFTYPE_WDS:
635 case NL80211_IFTYPE_P2P_DEVICE:
636 break;
637 default:
638 /* not reached */
639 WARN_ON(1);
640 }
641
642 /*
643 * set default queue parameters so drivers don't
644 * need to initialise the hardware if the hardware
645 * doesn't start up with sane defaults
646 */
647 ieee80211_set_wmm_default(sdata, true);
648 }
649
650 set_bit(SDATA_STATE_RUNNING, &sdata->state);
651
652 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
653 /* Create STA entry for the WDS peer */
654 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
655 GFP_KERNEL);
656 if (!sta) {
657 res = -ENOMEM;
658 goto err_del_interface;
659 }
660
661 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
662 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
663 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
664
665 res = sta_info_insert(sta);
666 if (res) {
667 /* STA has been freed */
668 goto err_del_interface;
669 }
670
671 rate_control_rate_init(sta);
672 netif_carrier_on(dev);
673 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
674 rcu_assign_pointer(local->p2p_sdata, sdata);
675 }
676
677 /*
678 * set_multicast_list will be invoked by the networking core
679 * which will check whether any increments here were done in
680 * error and sync them down to the hardware as filter flags.
681 */
682 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
683 atomic_inc(&local->iff_allmultis);
684
685 if (sdata->flags & IEEE80211_SDATA_PROMISC)
686 atomic_inc(&local->iff_promiscs);
687
688 if (coming_up)
689 local->open_count++;
690
691 if (hw_reconf_flags)
692 ieee80211_hw_config(local, hw_reconf_flags);
693
694 ieee80211_recalc_ps(local, -1);
695
696 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
697 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
698 /* XXX: for AP_VLAN, actually track AP queues */
699 netif_tx_start_all_queues(dev);
700 } else if (dev) {
701 unsigned long flags;
702 int n_acs = IEEE80211_NUM_ACS;
703 int ac;
704
705 if (local->hw.queues < IEEE80211_NUM_ACS)
706 n_acs = 1;
707
708 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
709 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
710 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
711 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
712 for (ac = 0; ac < n_acs; ac++) {
713 int ac_queue = sdata->vif.hw_queue[ac];
714
715 if (local->queue_stop_reasons[ac_queue] == 0 &&
716 skb_queue_empty(&local->pending[ac_queue]))
717 netif_start_subqueue(dev, ac);
718 }
719 }
720 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
721 }
722
723 return 0;
724 err_del_interface:
725 drv_remove_interface(local, sdata);
726 err_stop:
727 if (!local->open_count)
728 drv_stop(local);
729 err_del_bss:
730 sdata->bss = NULL;
731 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
732 mutex_lock(&local->mtx);
733 list_del(&sdata->u.vlan.list);
734 mutex_unlock(&local->mtx);
735 }
736 /* might already be clear but that doesn't matter */
737 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
738 return res;
739 }
740
741 static int ieee80211_open(struct net_device *dev)
742 {
743 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
744 int err;
745
746 /* fail early if user set an invalid address */
747 if (!is_valid_ether_addr(dev->dev_addr))
748 return -EADDRNOTAVAIL;
749
750 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
751 if (err)
752 return err;
753
754 return ieee80211_do_open(&sdata->wdev, true);
755 }
756
757 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
758 bool going_down)
759 {
760 struct ieee80211_local *local = sdata->local;
761 unsigned long flags;
762 struct sk_buff *skb, *tmp;
763 u32 hw_reconf_flags = 0;
764 int i, flushed;
765 struct ps_data *ps;
766 struct cfg80211_chan_def chandef;
767
768 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
769
770 if (rcu_access_pointer(local->scan_sdata) == sdata)
771 ieee80211_scan_cancel(local);
772
773 /*
774 * Stop TX on this interface first.
775 */
776 if (sdata->dev)
777 netif_tx_stop_all_queues(sdata->dev);
778
779 ieee80211_roc_purge(local, sdata);
780
781 switch (sdata->vif.type) {
782 case NL80211_IFTYPE_STATION:
783 ieee80211_mgd_stop(sdata);
784 break;
785 case NL80211_IFTYPE_ADHOC:
786 ieee80211_ibss_stop(sdata);
787 break;
788 case NL80211_IFTYPE_AP:
789 cancel_work_sync(&sdata->u.ap.request_smps_work);
790 break;
791 default:
792 break;
793 }
794
795 /*
796 * Remove all stations associated with this interface.
797 *
798 * This must be done before calling ops->remove_interface()
799 * because otherwise we can later invoke ops->sta_notify()
800 * whenever the STAs are removed, and that invalidates driver
801 * assumptions about always getting a vif pointer that is valid
802 * (because if we remove a STA after ops->remove_interface()
803 * the driver will have removed the vif info already!)
804 *
805 * This is relevant only in WDS mode, in all other modes we've
806 * already removed all stations when disconnecting or similar,
807 * so warn otherwise.
808 */
809 flushed = sta_info_flush(sdata);
810 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
811 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
812
813 /* don't count this interface for promisc/allmulti while it is down */
814 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
815 atomic_dec(&local->iff_allmultis);
816
817 if (sdata->flags & IEEE80211_SDATA_PROMISC)
818 atomic_dec(&local->iff_promiscs);
819
820 if (sdata->vif.type == NL80211_IFTYPE_AP) {
821 local->fif_pspoll--;
822 local->fif_probe_req--;
823 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
824 local->fif_probe_req--;
825 }
826
827 if (sdata->dev) {
828 netif_addr_lock_bh(sdata->dev);
829 spin_lock_bh(&local->filter_lock);
830 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
831 sdata->dev->addr_len);
832 spin_unlock_bh(&local->filter_lock);
833 netif_addr_unlock_bh(sdata->dev);
834 }
835
836 del_timer_sync(&local->dynamic_ps_timer);
837 cancel_work_sync(&local->dynamic_ps_enable_work);
838
839 cancel_work_sync(&sdata->recalc_smps);
840 sdata_lock(sdata);
841 sdata->vif.csa_active = false;
842 sdata_unlock(sdata);
843 cancel_work_sync(&sdata->csa_finalize_work);
844
845 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
846
847 if (sdata->wdev.cac_started) {
848 chandef = sdata->vif.bss_conf.chandef;
849 WARN_ON(local->suspended);
850 mutex_lock(&local->mtx);
851 ieee80211_vif_release_channel(sdata);
852 mutex_unlock(&local->mtx);
853 cfg80211_cac_event(sdata->dev, &chandef,
854 NL80211_RADAR_CAC_ABORTED,
855 GFP_KERNEL);
856 }
857
858 /* APs need special treatment */
859 if (sdata->vif.type == NL80211_IFTYPE_AP) {
860 struct ieee80211_sub_if_data *vlan, *tmpsdata;
861
862 /* down all dependent devices, that is VLANs */
863 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
864 u.vlan.list)
865 dev_close(vlan->dev);
866 WARN_ON(!list_empty(&sdata->u.ap.vlans));
867 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
868 /* remove all packets in parent bc_buf pointing to this dev */
869 ps = &sdata->bss->ps;
870
871 spin_lock_irqsave(&ps->bc_buf.lock, flags);
872 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
873 if (skb->dev == sdata->dev) {
874 __skb_unlink(skb, &ps->bc_buf);
875 local->total_ps_buffered--;
876 ieee80211_free_txskb(&local->hw, skb);
877 }
878 }
879 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
880 }
881
882 if (going_down)
883 local->open_count--;
884
885 switch (sdata->vif.type) {
886 case NL80211_IFTYPE_AP_VLAN:
887 mutex_lock(&local->mtx);
888 list_del(&sdata->u.vlan.list);
889 mutex_unlock(&local->mtx);
890 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
891 /* no need to tell driver */
892 break;
893 case NL80211_IFTYPE_MONITOR:
894 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
895 local->cooked_mntrs--;
896 break;
897 }
898
899 local->monitors--;
900 if (local->monitors == 0) {
901 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
902 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
903 }
904
905 ieee80211_adjust_monitor_flags(sdata, -1);
906 break;
907 case NL80211_IFTYPE_P2P_DEVICE:
908 /* relies on synchronize_rcu() below */
909 RCU_INIT_POINTER(local->p2p_sdata, NULL);
910 /* fall through */
911 default:
912 cancel_work_sync(&sdata->work);
913 /*
914 * When we get here, the interface is marked down.
915 * Free the remaining keys, if there are any
916 * (shouldn't be, except maybe in WDS mode?)
917 *
918 * Force the key freeing to always synchronize_net()
919 * to wait for the RX path in case it is using this
920 * interface enqueuing frames * at this very time on
921 * another CPU.
922 */
923 ieee80211_free_keys(sdata, true);
924
925 /* fall through */
926 case NL80211_IFTYPE_AP:
927 skb_queue_purge(&sdata->skb_queue);
928 }
929
930 sdata->bss = NULL;
931
932 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
933 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
934 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
935 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
936 if (info->control.vif == &sdata->vif) {
937 __skb_unlink(skb, &local->pending[i]);
938 ieee80211_free_txskb(&local->hw, skb);
939 }
940 }
941 }
942 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
943
944 if (local->open_count == 0)
945 ieee80211_clear_tx_pending(local);
946
947 /*
948 * If the interface goes down while suspended, presumably because
949 * the device was unplugged and that happens before our resume,
950 * then the driver is already unconfigured and the remainder of
951 * this function isn't needed.
952 * XXX: what about WoWLAN? If the device has software state, e.g.
953 * memory allocated, it might expect teardown commands from
954 * mac80211 here?
955 */
956 if (local->suspended) {
957 WARN_ON(local->wowlan);
958 WARN_ON(rtnl_dereference(local->monitor_sdata));
959 return;
960 }
961
962 switch (sdata->vif.type) {
963 case NL80211_IFTYPE_AP_VLAN:
964 break;
965 case NL80211_IFTYPE_MONITOR:
966 if (local->monitors == 0)
967 ieee80211_del_virtual_monitor(local);
968
969 mutex_lock(&local->mtx);
970 ieee80211_recalc_idle(local);
971 mutex_unlock(&local->mtx);
972
973 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
974 break;
975
976 /* fall through */
977 default:
978 if (going_down)
979 drv_remove_interface(local, sdata);
980 }
981
982 ieee80211_recalc_ps(local, -1);
983
984 if (local->open_count == 0) {
985 ieee80211_stop_device(local);
986
987 /* no reconfiguring after stop! */
988 return;
989 }
990
991 /* do after stop to avoid reconfiguring when we stop anyway */
992 ieee80211_configure_filter(local);
993 ieee80211_hw_config(local, hw_reconf_flags);
994
995 if (local->monitors == local->open_count)
996 ieee80211_add_virtual_monitor(local);
997 }
998
999 static int ieee80211_stop(struct net_device *dev)
1000 {
1001 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1002
1003 ieee80211_do_stop(sdata, true);
1004
1005 return 0;
1006 }
1007
1008 static void ieee80211_set_multicast_list(struct net_device *dev)
1009 {
1010 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1011 struct ieee80211_local *local = sdata->local;
1012 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1013
1014 allmulti = !!(dev->flags & IFF_ALLMULTI);
1015 promisc = !!(dev->flags & IFF_PROMISC);
1016 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1017 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1018
1019 if (allmulti != sdata_allmulti) {
1020 if (dev->flags & IFF_ALLMULTI)
1021 atomic_inc(&local->iff_allmultis);
1022 else
1023 atomic_dec(&local->iff_allmultis);
1024 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1025 }
1026
1027 if (promisc != sdata_promisc) {
1028 if (dev->flags & IFF_PROMISC)
1029 atomic_inc(&local->iff_promiscs);
1030 else
1031 atomic_dec(&local->iff_promiscs);
1032 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1033 }
1034 spin_lock_bh(&local->filter_lock);
1035 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1036 spin_unlock_bh(&local->filter_lock);
1037 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1038 }
1039
1040 /*
1041 * Called when the netdev is removed or, by the code below, before
1042 * the interface type changes.
1043 */
1044 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1045 {
1046 int i;
1047
1048 /* free extra data */
1049 ieee80211_free_keys(sdata, false);
1050
1051 ieee80211_debugfs_remove_netdev(sdata);
1052
1053 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1054 __skb_queue_purge(&sdata->fragments[i].skb_list);
1055 sdata->fragment_next = 0;
1056
1057 if (ieee80211_vif_is_mesh(&sdata->vif))
1058 mesh_rmc_free(sdata);
1059 }
1060
1061 static void ieee80211_uninit(struct net_device *dev)
1062 {
1063 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1064 }
1065
1066 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1067 struct sk_buff *skb,
1068 void *accel_priv,
1069 select_queue_fallback_t fallback)
1070 {
1071 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1072 }
1073
1074 static const struct net_device_ops ieee80211_dataif_ops = {
1075 .ndo_open = ieee80211_open,
1076 .ndo_stop = ieee80211_stop,
1077 .ndo_uninit = ieee80211_uninit,
1078 .ndo_start_xmit = ieee80211_subif_start_xmit,
1079 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1080 .ndo_change_mtu = ieee80211_change_mtu,
1081 .ndo_set_mac_address = ieee80211_change_mac,
1082 .ndo_select_queue = ieee80211_netdev_select_queue,
1083 };
1084
1085 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1086 struct sk_buff *skb,
1087 void *accel_priv,
1088 select_queue_fallback_t fallback)
1089 {
1090 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1091 struct ieee80211_local *local = sdata->local;
1092 struct ieee80211_hdr *hdr;
1093 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1094
1095 if (local->hw.queues < IEEE80211_NUM_ACS)
1096 return 0;
1097
1098 if (skb->len < 4 ||
1099 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1100 return 0; /* doesn't matter, frame will be dropped */
1101
1102 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1103
1104 return ieee80211_select_queue_80211(sdata, skb, hdr);
1105 }
1106
1107 static const struct net_device_ops ieee80211_monitorif_ops = {
1108 .ndo_open = ieee80211_open,
1109 .ndo_stop = ieee80211_stop,
1110 .ndo_uninit = ieee80211_uninit,
1111 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1112 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1113 .ndo_change_mtu = ieee80211_change_mtu,
1114 .ndo_set_mac_address = ieee80211_change_mac,
1115 .ndo_select_queue = ieee80211_monitor_select_queue,
1116 };
1117
1118 static void ieee80211_if_setup(struct net_device *dev)
1119 {
1120 ether_setup(dev);
1121 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1122 dev->netdev_ops = &ieee80211_dataif_ops;
1123 dev->destructor = free_netdev;
1124 }
1125
1126 static void ieee80211_iface_work(struct work_struct *work)
1127 {
1128 struct ieee80211_sub_if_data *sdata =
1129 container_of(work, struct ieee80211_sub_if_data, work);
1130 struct ieee80211_local *local = sdata->local;
1131 struct sk_buff *skb;
1132 struct sta_info *sta;
1133 struct ieee80211_ra_tid *ra_tid;
1134
1135 if (!ieee80211_sdata_running(sdata))
1136 return;
1137
1138 if (local->scanning)
1139 return;
1140
1141 /*
1142 * ieee80211_queue_work() should have picked up most cases,
1143 * here we'll pick the rest.
1144 */
1145 if (WARN(local->suspended,
1146 "interface work scheduled while going to suspend\n"))
1147 return;
1148
1149 /* first process frames */
1150 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1151 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1152
1153 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1154 ra_tid = (void *)&skb->cb;
1155 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1156 ra_tid->tid);
1157 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1158 ra_tid = (void *)&skb->cb;
1159 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1160 ra_tid->tid);
1161 } else if (ieee80211_is_action(mgmt->frame_control) &&
1162 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1163 int len = skb->len;
1164
1165 mutex_lock(&local->sta_mtx);
1166 sta = sta_info_get_bss(sdata, mgmt->sa);
1167 if (sta) {
1168 switch (mgmt->u.action.u.addba_req.action_code) {
1169 case WLAN_ACTION_ADDBA_REQ:
1170 ieee80211_process_addba_request(
1171 local, sta, mgmt, len);
1172 break;
1173 case WLAN_ACTION_ADDBA_RESP:
1174 ieee80211_process_addba_resp(local, sta,
1175 mgmt, len);
1176 break;
1177 case WLAN_ACTION_DELBA:
1178 ieee80211_process_delba(sdata, sta,
1179 mgmt, len);
1180 break;
1181 default:
1182 WARN_ON(1);
1183 break;
1184 }
1185 }
1186 mutex_unlock(&local->sta_mtx);
1187 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1188 struct ieee80211_hdr *hdr = (void *)mgmt;
1189 /*
1190 * So the frame isn't mgmt, but frame_control
1191 * is at the right place anyway, of course, so
1192 * the if statement is correct.
1193 *
1194 * Warn if we have other data frame types here,
1195 * they must not get here.
1196 */
1197 WARN_ON(hdr->frame_control &
1198 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1199 WARN_ON(!(hdr->seq_ctrl &
1200 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1201 /*
1202 * This was a fragment of a frame, received while
1203 * a block-ack session was active. That cannot be
1204 * right, so terminate the session.
1205 */
1206 mutex_lock(&local->sta_mtx);
1207 sta = sta_info_get_bss(sdata, mgmt->sa);
1208 if (sta) {
1209 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1210 IEEE80211_QOS_CTL_TID_MASK;
1211
1212 __ieee80211_stop_rx_ba_session(
1213 sta, tid, WLAN_BACK_RECIPIENT,
1214 WLAN_REASON_QSTA_REQUIRE_SETUP,
1215 true);
1216 }
1217 mutex_unlock(&local->sta_mtx);
1218 } else switch (sdata->vif.type) {
1219 case NL80211_IFTYPE_STATION:
1220 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1221 break;
1222 case NL80211_IFTYPE_ADHOC:
1223 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1224 break;
1225 case NL80211_IFTYPE_MESH_POINT:
1226 if (!ieee80211_vif_is_mesh(&sdata->vif))
1227 break;
1228 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1229 break;
1230 default:
1231 WARN(1, "frame for unexpected interface type");
1232 break;
1233 }
1234
1235 kfree_skb(skb);
1236 }
1237
1238 /* then other type-dependent work */
1239 switch (sdata->vif.type) {
1240 case NL80211_IFTYPE_STATION:
1241 ieee80211_sta_work(sdata);
1242 break;
1243 case NL80211_IFTYPE_ADHOC:
1244 ieee80211_ibss_work(sdata);
1245 break;
1246 case NL80211_IFTYPE_MESH_POINT:
1247 if (!ieee80211_vif_is_mesh(&sdata->vif))
1248 break;
1249 ieee80211_mesh_work(sdata);
1250 break;
1251 default:
1252 break;
1253 }
1254 }
1255
1256 static void ieee80211_recalc_smps_work(struct work_struct *work)
1257 {
1258 struct ieee80211_sub_if_data *sdata =
1259 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1260
1261 ieee80211_recalc_smps(sdata);
1262 }
1263
1264 /*
1265 * Helper function to initialise an interface to a specific type.
1266 */
1267 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1268 enum nl80211_iftype type)
1269 {
1270 /* clear type-dependent union */
1271 memset(&sdata->u, 0, sizeof(sdata->u));
1272
1273 /* and set some type-dependent values */
1274 sdata->vif.type = type;
1275 sdata->vif.p2p = false;
1276 sdata->wdev.iftype = type;
1277
1278 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1279 sdata->control_port_no_encrypt = false;
1280 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1281
1282 sdata->noack_map = 0;
1283
1284 /* only monitor/p2p-device differ */
1285 if (sdata->dev) {
1286 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1287 sdata->dev->type = ARPHRD_ETHER;
1288 }
1289
1290 skb_queue_head_init(&sdata->skb_queue);
1291 INIT_WORK(&sdata->work, ieee80211_iface_work);
1292 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1293 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1294 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1295 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1296
1297 switch (type) {
1298 case NL80211_IFTYPE_P2P_GO:
1299 type = NL80211_IFTYPE_AP;
1300 sdata->vif.type = type;
1301 sdata->vif.p2p = true;
1302 /* fall through */
1303 case NL80211_IFTYPE_AP:
1304 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1305 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1306 INIT_WORK(&sdata->u.ap.request_smps_work,
1307 ieee80211_request_smps_ap_work);
1308 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1309 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1310 break;
1311 case NL80211_IFTYPE_P2P_CLIENT:
1312 type = NL80211_IFTYPE_STATION;
1313 sdata->vif.type = type;
1314 sdata->vif.p2p = true;
1315 /* fall through */
1316 case NL80211_IFTYPE_STATION:
1317 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1318 ieee80211_sta_setup_sdata(sdata);
1319 break;
1320 case NL80211_IFTYPE_ADHOC:
1321 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1322 ieee80211_ibss_setup_sdata(sdata);
1323 break;
1324 case NL80211_IFTYPE_MESH_POINT:
1325 if (ieee80211_vif_is_mesh(&sdata->vif))
1326 ieee80211_mesh_init_sdata(sdata);
1327 break;
1328 case NL80211_IFTYPE_MONITOR:
1329 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1330 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1331 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1332 MONITOR_FLAG_OTHER_BSS;
1333 break;
1334 case NL80211_IFTYPE_WDS:
1335 sdata->vif.bss_conf.bssid = NULL;
1336 break;
1337 case NL80211_IFTYPE_AP_VLAN:
1338 case NL80211_IFTYPE_P2P_DEVICE:
1339 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1340 break;
1341 case NL80211_IFTYPE_UNSPECIFIED:
1342 case NUM_NL80211_IFTYPES:
1343 BUG();
1344 break;
1345 }
1346
1347 ieee80211_debugfs_add_netdev(sdata);
1348 }
1349
1350 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1351 enum nl80211_iftype type)
1352 {
1353 struct ieee80211_local *local = sdata->local;
1354 int ret, err;
1355 enum nl80211_iftype internal_type = type;
1356 bool p2p = false;
1357
1358 ASSERT_RTNL();
1359
1360 if (!local->ops->change_interface)
1361 return -EBUSY;
1362
1363 switch (sdata->vif.type) {
1364 case NL80211_IFTYPE_AP:
1365 case NL80211_IFTYPE_STATION:
1366 case NL80211_IFTYPE_ADHOC:
1367 /*
1368 * Could maybe also all others here?
1369 * Just not sure how that interacts
1370 * with the RX/config path e.g. for
1371 * mesh.
1372 */
1373 break;
1374 default:
1375 return -EBUSY;
1376 }
1377
1378 switch (type) {
1379 case NL80211_IFTYPE_AP:
1380 case NL80211_IFTYPE_STATION:
1381 case NL80211_IFTYPE_ADHOC:
1382 /*
1383 * Could probably support everything
1384 * but WDS here (WDS do_open can fail
1385 * under memory pressure, which this
1386 * code isn't prepared to handle).
1387 */
1388 break;
1389 case NL80211_IFTYPE_P2P_CLIENT:
1390 p2p = true;
1391 internal_type = NL80211_IFTYPE_STATION;
1392 break;
1393 case NL80211_IFTYPE_P2P_GO:
1394 p2p = true;
1395 internal_type = NL80211_IFTYPE_AP;
1396 break;
1397 default:
1398 return -EBUSY;
1399 }
1400
1401 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1402 if (ret)
1403 return ret;
1404
1405 ieee80211_do_stop(sdata, false);
1406
1407 ieee80211_teardown_sdata(sdata);
1408
1409 ret = drv_change_interface(local, sdata, internal_type, p2p);
1410 if (ret)
1411 type = ieee80211_vif_type_p2p(&sdata->vif);
1412
1413 /*
1414 * Ignore return value here, there's not much we can do since
1415 * the driver changed the interface type internally already.
1416 * The warnings will hopefully make driver authors fix it :-)
1417 */
1418 ieee80211_check_queues(sdata, type);
1419
1420 ieee80211_setup_sdata(sdata, type);
1421
1422 err = ieee80211_do_open(&sdata->wdev, false);
1423 WARN(err, "type change: do_open returned %d", err);
1424
1425 return ret;
1426 }
1427
1428 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1429 enum nl80211_iftype type)
1430 {
1431 int ret;
1432
1433 ASSERT_RTNL();
1434
1435 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1436 return 0;
1437
1438 if (ieee80211_sdata_running(sdata)) {
1439 ret = ieee80211_runtime_change_iftype(sdata, type);
1440 if (ret)
1441 return ret;
1442 } else {
1443 /* Purge and reset type-dependent state. */
1444 ieee80211_teardown_sdata(sdata);
1445 ieee80211_setup_sdata(sdata, type);
1446 }
1447
1448 /* reset some values that shouldn't be kept across type changes */
1449 sdata->drop_unencrypted = 0;
1450 if (type == NL80211_IFTYPE_STATION)
1451 sdata->u.mgd.use_4addr = false;
1452
1453 return 0;
1454 }
1455
1456 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1457 u8 *perm_addr, enum nl80211_iftype type)
1458 {
1459 struct ieee80211_sub_if_data *sdata;
1460 u64 mask, start, addr, val, inc;
1461 u8 *m;
1462 u8 tmp_addr[ETH_ALEN];
1463 int i;
1464
1465 /* default ... something at least */
1466 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1467
1468 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1469 local->hw.wiphy->n_addresses <= 1)
1470 return;
1471
1472 mutex_lock(&local->iflist_mtx);
1473
1474 switch (type) {
1475 case NL80211_IFTYPE_MONITOR:
1476 /* doesn't matter */
1477 break;
1478 case NL80211_IFTYPE_WDS:
1479 case NL80211_IFTYPE_AP_VLAN:
1480 /* match up with an AP interface */
1481 list_for_each_entry(sdata, &local->interfaces, list) {
1482 if (sdata->vif.type != NL80211_IFTYPE_AP)
1483 continue;
1484 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1485 break;
1486 }
1487 /* keep default if no AP interface present */
1488 break;
1489 case NL80211_IFTYPE_P2P_CLIENT:
1490 case NL80211_IFTYPE_P2P_GO:
1491 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1492 list_for_each_entry(sdata, &local->interfaces, list) {
1493 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1494 continue;
1495 if (!ieee80211_sdata_running(sdata))
1496 continue;
1497 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1498 goto out_unlock;
1499 }
1500 }
1501 /* otherwise fall through */
1502 default:
1503 /* assign a new address if possible -- try n_addresses first */
1504 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1505 bool used = false;
1506
1507 list_for_each_entry(sdata, &local->interfaces, list) {
1508 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1509 sdata->vif.addr)) {
1510 used = true;
1511 break;
1512 }
1513 }
1514
1515 if (!used) {
1516 memcpy(perm_addr,
1517 local->hw.wiphy->addresses[i].addr,
1518 ETH_ALEN);
1519 break;
1520 }
1521 }
1522
1523 /* try mask if available */
1524 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1525 break;
1526
1527 m = local->hw.wiphy->addr_mask;
1528 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1529 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1530 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1531
1532 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1533 /* not a contiguous mask ... not handled now! */
1534 pr_info("not contiguous\n");
1535 break;
1536 }
1537
1538 /*
1539 * Pick address of existing interface in case user changed
1540 * MAC address manually, default to perm_addr.
1541 */
1542 m = local->hw.wiphy->perm_addr;
1543 list_for_each_entry(sdata, &local->interfaces, list) {
1544 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1545 continue;
1546 m = sdata->vif.addr;
1547 break;
1548 }
1549 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1550 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1551 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1552
1553 inc = 1ULL<<__ffs64(mask);
1554 val = (start & mask);
1555 addr = (start & ~mask) | (val & mask);
1556 do {
1557 bool used = false;
1558
1559 tmp_addr[5] = addr >> 0*8;
1560 tmp_addr[4] = addr >> 1*8;
1561 tmp_addr[3] = addr >> 2*8;
1562 tmp_addr[2] = addr >> 3*8;
1563 tmp_addr[1] = addr >> 4*8;
1564 tmp_addr[0] = addr >> 5*8;
1565
1566 val += inc;
1567
1568 list_for_each_entry(sdata, &local->interfaces, list) {
1569 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1570 used = true;
1571 break;
1572 }
1573 }
1574
1575 if (!used) {
1576 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1577 break;
1578 }
1579 addr = (start & ~mask) | (val & mask);
1580 } while (addr != start);
1581
1582 break;
1583 }
1584
1585 out_unlock:
1586 mutex_unlock(&local->iflist_mtx);
1587 }
1588
1589 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1590 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1591 struct vif_params *params)
1592 {
1593 struct net_device *ndev = NULL;
1594 struct ieee80211_sub_if_data *sdata = NULL;
1595 int ret, i;
1596 int txqs = 1;
1597
1598 ASSERT_RTNL();
1599
1600 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1601 struct wireless_dev *wdev;
1602
1603 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1604 GFP_KERNEL);
1605 if (!sdata)
1606 return -ENOMEM;
1607 wdev = &sdata->wdev;
1608
1609 sdata->dev = NULL;
1610 strlcpy(sdata->name, name, IFNAMSIZ);
1611 ieee80211_assign_perm_addr(local, wdev->address, type);
1612 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1613 } else {
1614 if (local->hw.queues >= IEEE80211_NUM_ACS)
1615 txqs = IEEE80211_NUM_ACS;
1616
1617 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1618 local->hw.vif_data_size,
1619 name, ieee80211_if_setup, txqs, 1);
1620 if (!ndev)
1621 return -ENOMEM;
1622 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1623
1624 ndev->needed_headroom = local->tx_headroom +
1625 4*6 /* four MAC addresses */
1626 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1627 + 6 /* mesh */
1628 + 8 /* rfc1042/bridge tunnel */
1629 - ETH_HLEN /* ethernet hard_header_len */
1630 + IEEE80211_ENCRYPT_HEADROOM;
1631 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1632
1633 ret = dev_alloc_name(ndev, ndev->name);
1634 if (ret < 0) {
1635 free_netdev(ndev);
1636 return ret;
1637 }
1638
1639 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1640 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1641 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1642
1643 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1644 sdata = netdev_priv(ndev);
1645 ndev->ieee80211_ptr = &sdata->wdev;
1646 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1647 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1648
1649 sdata->dev = ndev;
1650 }
1651
1652 /* initialise type-independent data */
1653 sdata->wdev.wiphy = local->hw.wiphy;
1654 sdata->local = local;
1655
1656 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1657 skb_queue_head_init(&sdata->fragments[i].skb_list);
1658
1659 INIT_LIST_HEAD(&sdata->key_list);
1660
1661 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1662 ieee80211_dfs_cac_timer_work);
1663 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1664 ieee80211_delayed_tailroom_dec);
1665
1666 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1667 struct ieee80211_supported_band *sband;
1668 sband = local->hw.wiphy->bands[i];
1669 sdata->rc_rateidx_mask[i] =
1670 sband ? (1 << sband->n_bitrates) - 1 : 0;
1671 if (sband)
1672 memcpy(sdata->rc_rateidx_mcs_mask[i],
1673 sband->ht_cap.mcs.rx_mask,
1674 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1675 else
1676 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1677 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1678 }
1679
1680 ieee80211_set_default_queues(sdata);
1681
1682 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1683 sdata->user_power_level = local->user_power_level;
1684
1685 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1686
1687 /* setup type-dependent data */
1688 ieee80211_setup_sdata(sdata, type);
1689
1690 if (ndev) {
1691 if (params) {
1692 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1693 if (type == NL80211_IFTYPE_STATION)
1694 sdata->u.mgd.use_4addr = params->use_4addr;
1695 }
1696
1697 ndev->features |= local->hw.netdev_features;
1698
1699 ret = register_netdevice(ndev);
1700 if (ret) {
1701 free_netdev(ndev);
1702 return ret;
1703 }
1704 }
1705
1706 mutex_lock(&local->iflist_mtx);
1707 list_add_tail_rcu(&sdata->list, &local->interfaces);
1708 mutex_unlock(&local->iflist_mtx);
1709
1710 if (new_wdev)
1711 *new_wdev = &sdata->wdev;
1712
1713 return 0;
1714 }
1715
1716 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1717 {
1718 ASSERT_RTNL();
1719
1720 mutex_lock(&sdata->local->iflist_mtx);
1721 list_del_rcu(&sdata->list);
1722 mutex_unlock(&sdata->local->iflist_mtx);
1723
1724 synchronize_rcu();
1725
1726 if (sdata->dev) {
1727 unregister_netdevice(sdata->dev);
1728 } else {
1729 cfg80211_unregister_wdev(&sdata->wdev);
1730 kfree(sdata);
1731 }
1732 }
1733
1734 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1735 {
1736 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1737 return;
1738 ieee80211_do_stop(sdata, true);
1739 ieee80211_teardown_sdata(sdata);
1740 }
1741
1742 /*
1743 * Remove all interfaces, may only be called at hardware unregistration
1744 * time because it doesn't do RCU-safe list removals.
1745 */
1746 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1747 {
1748 struct ieee80211_sub_if_data *sdata, *tmp;
1749 LIST_HEAD(unreg_list);
1750 LIST_HEAD(wdev_list);
1751
1752 ASSERT_RTNL();
1753
1754 /*
1755 * Close all AP_VLAN interfaces first, as otherwise they
1756 * might be closed while the AP interface they belong to
1757 * is closed, causing unregister_netdevice_many() to crash.
1758 */
1759 list_for_each_entry(sdata, &local->interfaces, list)
1760 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1761 dev_close(sdata->dev);
1762
1763 mutex_lock(&local->iflist_mtx);
1764 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1765 list_del(&sdata->list);
1766
1767 if (sdata->dev)
1768 unregister_netdevice_queue(sdata->dev, &unreg_list);
1769 else
1770 list_add(&sdata->list, &wdev_list);
1771 }
1772 mutex_unlock(&local->iflist_mtx);
1773 unregister_netdevice_many(&unreg_list);
1774 list_del(&unreg_list);
1775
1776 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1777 list_del(&sdata->list);
1778 cfg80211_unregister_wdev(&sdata->wdev);
1779 kfree(sdata);
1780 }
1781 }
1782
1783 static int netdev_notify(struct notifier_block *nb,
1784 unsigned long state, void *ptr)
1785 {
1786 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1787 struct ieee80211_sub_if_data *sdata;
1788
1789 if (state != NETDEV_CHANGENAME)
1790 return NOTIFY_DONE;
1791
1792 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1793 return NOTIFY_DONE;
1794
1795 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1796 return NOTIFY_DONE;
1797
1798 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1799 memcpy(sdata->name, dev->name, IFNAMSIZ);
1800 ieee80211_debugfs_rename_netdev(sdata);
1801
1802 return NOTIFY_OK;
1803 }
1804
1805 static struct notifier_block mac80211_netdev_notifier = {
1806 .notifier_call = netdev_notify,
1807 };
1808
1809 int ieee80211_iface_init(void)
1810 {
1811 return register_netdevice_notifier(&mac80211_netdev_notifier);
1812 }
1813
1814 void ieee80211_iface_exit(void)
1815 {
1816 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1817 }
Linux kernel - Deliverables
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