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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[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 mutex_lock(&local->mtx);
842 sdata->vif.csa_active = false;
843 if (!ieee80211_csa_needs_block_tx(local))
844 ieee80211_wake_queues_by_reason(&local->hw,
845 IEEE80211_MAX_QUEUE_MAP,
846 IEEE80211_QUEUE_STOP_REASON_CSA);
847 mutex_unlock(&local->mtx);
848 sdata_unlock(sdata);
849
850 cancel_work_sync(&sdata->csa_finalize_work);
851
852 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
853
854 if (sdata->wdev.cac_started) {
855 chandef = sdata->vif.bss_conf.chandef;
856 WARN_ON(local->suspended);
857 mutex_lock(&local->mtx);
858 ieee80211_vif_release_channel(sdata);
859 mutex_unlock(&local->mtx);
860 cfg80211_cac_event(sdata->dev, &chandef,
861 NL80211_RADAR_CAC_ABORTED,
862 GFP_KERNEL);
863 }
864
865 /* APs need special treatment */
866 if (sdata->vif.type == NL80211_IFTYPE_AP) {
867 struct ieee80211_sub_if_data *vlan, *tmpsdata;
868
869 /* down all dependent devices, that is VLANs */
870 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
871 u.vlan.list)
872 dev_close(vlan->dev);
873 WARN_ON(!list_empty(&sdata->u.ap.vlans));
874 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
875 /* remove all packets in parent bc_buf pointing to this dev */
876 ps = &sdata->bss->ps;
877
878 spin_lock_irqsave(&ps->bc_buf.lock, flags);
879 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
880 if (skb->dev == sdata->dev) {
881 __skb_unlink(skb, &ps->bc_buf);
882 local->total_ps_buffered--;
883 ieee80211_free_txskb(&local->hw, skb);
884 }
885 }
886 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
887 }
888
889 if (going_down)
890 local->open_count--;
891
892 switch (sdata->vif.type) {
893 case NL80211_IFTYPE_AP_VLAN:
894 mutex_lock(&local->mtx);
895 list_del(&sdata->u.vlan.list);
896 mutex_unlock(&local->mtx);
897 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
898 /* no need to tell driver */
899 break;
900 case NL80211_IFTYPE_MONITOR:
901 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
902 local->cooked_mntrs--;
903 break;
904 }
905
906 local->monitors--;
907 if (local->monitors == 0) {
908 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
909 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
910 }
911
912 ieee80211_adjust_monitor_flags(sdata, -1);
913 break;
914 case NL80211_IFTYPE_P2P_DEVICE:
915 /* relies on synchronize_rcu() below */
916 RCU_INIT_POINTER(local->p2p_sdata, NULL);
917 /* fall through */
918 default:
919 cancel_work_sync(&sdata->work);
920 /*
921 * When we get here, the interface is marked down.
922 * Free the remaining keys, if there are any
923 * (shouldn't be, except maybe in WDS mode?)
924 *
925 * Force the key freeing to always synchronize_net()
926 * to wait for the RX path in case it is using this
927 * interface enqueuing frames * at this very time on
928 * another CPU.
929 */
930 ieee80211_free_keys(sdata, true);
931
932 /* fall through */
933 case NL80211_IFTYPE_AP:
934 skb_queue_purge(&sdata->skb_queue);
935 }
936
937 sdata->bss = NULL;
938
939 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
940 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
941 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
942 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
943 if (info->control.vif == &sdata->vif) {
944 __skb_unlink(skb, &local->pending[i]);
945 ieee80211_free_txskb(&local->hw, skb);
946 }
947 }
948 }
949 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
950
951 if (local->open_count == 0)
952 ieee80211_clear_tx_pending(local);
953
954 /*
955 * If the interface goes down while suspended, presumably because
956 * the device was unplugged and that happens before our resume,
957 * then the driver is already unconfigured and the remainder of
958 * this function isn't needed.
959 * XXX: what about WoWLAN? If the device has software state, e.g.
960 * memory allocated, it might expect teardown commands from
961 * mac80211 here?
962 */
963 if (local->suspended) {
964 WARN_ON(local->wowlan);
965 WARN_ON(rtnl_dereference(local->monitor_sdata));
966 return;
967 }
968
969 switch (sdata->vif.type) {
970 case NL80211_IFTYPE_AP_VLAN:
971 break;
972 case NL80211_IFTYPE_MONITOR:
973 if (local->monitors == 0)
974 ieee80211_del_virtual_monitor(local);
975
976 mutex_lock(&local->mtx);
977 ieee80211_recalc_idle(local);
978 mutex_unlock(&local->mtx);
979
980 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
981 break;
982
983 /* fall through */
984 default:
985 if (going_down)
986 drv_remove_interface(local, sdata);
987 }
988
989 ieee80211_recalc_ps(local, -1);
990
991 if (local->open_count == 0) {
992 ieee80211_stop_device(local);
993
994 /* no reconfiguring after stop! */
995 return;
996 }
997
998 /* do after stop to avoid reconfiguring when we stop anyway */
999 ieee80211_configure_filter(local);
1000 ieee80211_hw_config(local, hw_reconf_flags);
1001
1002 if (local->monitors == local->open_count)
1003 ieee80211_add_virtual_monitor(local);
1004 }
1005
1006 static int ieee80211_stop(struct net_device *dev)
1007 {
1008 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1009
1010 ieee80211_do_stop(sdata, true);
1011
1012 return 0;
1013 }
1014
1015 static void ieee80211_set_multicast_list(struct net_device *dev)
1016 {
1017 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1018 struct ieee80211_local *local = sdata->local;
1019 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1020
1021 allmulti = !!(dev->flags & IFF_ALLMULTI);
1022 promisc = !!(dev->flags & IFF_PROMISC);
1023 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1024 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1025
1026 if (allmulti != sdata_allmulti) {
1027 if (dev->flags & IFF_ALLMULTI)
1028 atomic_inc(&local->iff_allmultis);
1029 else
1030 atomic_dec(&local->iff_allmultis);
1031 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1032 }
1033
1034 if (promisc != sdata_promisc) {
1035 if (dev->flags & IFF_PROMISC)
1036 atomic_inc(&local->iff_promiscs);
1037 else
1038 atomic_dec(&local->iff_promiscs);
1039 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1040 }
1041 spin_lock_bh(&local->filter_lock);
1042 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1043 spin_unlock_bh(&local->filter_lock);
1044 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1045 }
1046
1047 /*
1048 * Called when the netdev is removed or, by the code below, before
1049 * the interface type changes.
1050 */
1051 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1052 {
1053 int i;
1054
1055 /* free extra data */
1056 ieee80211_free_keys(sdata, false);
1057
1058 ieee80211_debugfs_remove_netdev(sdata);
1059
1060 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1061 __skb_queue_purge(&sdata->fragments[i].skb_list);
1062 sdata->fragment_next = 0;
1063
1064 if (ieee80211_vif_is_mesh(&sdata->vif))
1065 mesh_rmc_free(sdata);
1066 }
1067
1068 static void ieee80211_uninit(struct net_device *dev)
1069 {
1070 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1071 }
1072
1073 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1074 struct sk_buff *skb,
1075 void *accel_priv,
1076 select_queue_fallback_t fallback)
1077 {
1078 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1079 }
1080
1081 static const struct net_device_ops ieee80211_dataif_ops = {
1082 .ndo_open = ieee80211_open,
1083 .ndo_stop = ieee80211_stop,
1084 .ndo_uninit = ieee80211_uninit,
1085 .ndo_start_xmit = ieee80211_subif_start_xmit,
1086 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1087 .ndo_change_mtu = ieee80211_change_mtu,
1088 .ndo_set_mac_address = ieee80211_change_mac,
1089 .ndo_select_queue = ieee80211_netdev_select_queue,
1090 };
1091
1092 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1093 struct sk_buff *skb,
1094 void *accel_priv,
1095 select_queue_fallback_t fallback)
1096 {
1097 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1098 struct ieee80211_local *local = sdata->local;
1099 struct ieee80211_hdr *hdr;
1100 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1101
1102 if (local->hw.queues < IEEE80211_NUM_ACS)
1103 return 0;
1104
1105 if (skb->len < 4 ||
1106 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1107 return 0; /* doesn't matter, frame will be dropped */
1108
1109 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1110
1111 return ieee80211_select_queue_80211(sdata, skb, hdr);
1112 }
1113
1114 static const struct net_device_ops ieee80211_monitorif_ops = {
1115 .ndo_open = ieee80211_open,
1116 .ndo_stop = ieee80211_stop,
1117 .ndo_uninit = ieee80211_uninit,
1118 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1119 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1120 .ndo_change_mtu = ieee80211_change_mtu,
1121 .ndo_set_mac_address = ieee80211_change_mac,
1122 .ndo_select_queue = ieee80211_monitor_select_queue,
1123 };
1124
1125 static void ieee80211_if_setup(struct net_device *dev)
1126 {
1127 ether_setup(dev);
1128 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1129 dev->netdev_ops = &ieee80211_dataif_ops;
1130 dev->destructor = free_netdev;
1131 }
1132
1133 static void ieee80211_iface_work(struct work_struct *work)
1134 {
1135 struct ieee80211_sub_if_data *sdata =
1136 container_of(work, struct ieee80211_sub_if_data, work);
1137 struct ieee80211_local *local = sdata->local;
1138 struct sk_buff *skb;
1139 struct sta_info *sta;
1140 struct ieee80211_ra_tid *ra_tid;
1141
1142 if (!ieee80211_sdata_running(sdata))
1143 return;
1144
1145 if (local->scanning)
1146 return;
1147
1148 /*
1149 * ieee80211_queue_work() should have picked up most cases,
1150 * here we'll pick the rest.
1151 */
1152 if (WARN(local->suspended,
1153 "interface work scheduled while going to suspend\n"))
1154 return;
1155
1156 /* first process frames */
1157 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1158 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1159
1160 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1161 ra_tid = (void *)&skb->cb;
1162 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1163 ra_tid->tid);
1164 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1165 ra_tid = (void *)&skb->cb;
1166 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1167 ra_tid->tid);
1168 } else if (ieee80211_is_action(mgmt->frame_control) &&
1169 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1170 int len = skb->len;
1171
1172 mutex_lock(&local->sta_mtx);
1173 sta = sta_info_get_bss(sdata, mgmt->sa);
1174 if (sta) {
1175 switch (mgmt->u.action.u.addba_req.action_code) {
1176 case WLAN_ACTION_ADDBA_REQ:
1177 ieee80211_process_addba_request(
1178 local, sta, mgmt, len);
1179 break;
1180 case WLAN_ACTION_ADDBA_RESP:
1181 ieee80211_process_addba_resp(local, sta,
1182 mgmt, len);
1183 break;
1184 case WLAN_ACTION_DELBA:
1185 ieee80211_process_delba(sdata, sta,
1186 mgmt, len);
1187 break;
1188 default:
1189 WARN_ON(1);
1190 break;
1191 }
1192 }
1193 mutex_unlock(&local->sta_mtx);
1194 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1195 struct ieee80211_hdr *hdr = (void *)mgmt;
1196 /*
1197 * So the frame isn't mgmt, but frame_control
1198 * is at the right place anyway, of course, so
1199 * the if statement is correct.
1200 *
1201 * Warn if we have other data frame types here,
1202 * they must not get here.
1203 */
1204 WARN_ON(hdr->frame_control &
1205 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1206 WARN_ON(!(hdr->seq_ctrl &
1207 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1208 /*
1209 * This was a fragment of a frame, received while
1210 * a block-ack session was active. That cannot be
1211 * right, so terminate the session.
1212 */
1213 mutex_lock(&local->sta_mtx);
1214 sta = sta_info_get_bss(sdata, mgmt->sa);
1215 if (sta) {
1216 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1217 IEEE80211_QOS_CTL_TID_MASK;
1218
1219 __ieee80211_stop_rx_ba_session(
1220 sta, tid, WLAN_BACK_RECIPIENT,
1221 WLAN_REASON_QSTA_REQUIRE_SETUP,
1222 true);
1223 }
1224 mutex_unlock(&local->sta_mtx);
1225 } else switch (sdata->vif.type) {
1226 case NL80211_IFTYPE_STATION:
1227 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1228 break;
1229 case NL80211_IFTYPE_ADHOC:
1230 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1231 break;
1232 case NL80211_IFTYPE_MESH_POINT:
1233 if (!ieee80211_vif_is_mesh(&sdata->vif))
1234 break;
1235 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1236 break;
1237 default:
1238 WARN(1, "frame for unexpected interface type");
1239 break;
1240 }
1241
1242 kfree_skb(skb);
1243 }
1244
1245 /* then other type-dependent work */
1246 switch (sdata->vif.type) {
1247 case NL80211_IFTYPE_STATION:
1248 ieee80211_sta_work(sdata);
1249 break;
1250 case NL80211_IFTYPE_ADHOC:
1251 ieee80211_ibss_work(sdata);
1252 break;
1253 case NL80211_IFTYPE_MESH_POINT:
1254 if (!ieee80211_vif_is_mesh(&sdata->vif))
1255 break;
1256 ieee80211_mesh_work(sdata);
1257 break;
1258 default:
1259 break;
1260 }
1261 }
1262
1263 static void ieee80211_recalc_smps_work(struct work_struct *work)
1264 {
1265 struct ieee80211_sub_if_data *sdata =
1266 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1267
1268 ieee80211_recalc_smps(sdata);
1269 }
1270
1271 /*
1272 * Helper function to initialise an interface to a specific type.
1273 */
1274 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1275 enum nl80211_iftype type)
1276 {
1277 /* clear type-dependent union */
1278 memset(&sdata->u, 0, sizeof(sdata->u));
1279
1280 /* and set some type-dependent values */
1281 sdata->vif.type = type;
1282 sdata->vif.p2p = false;
1283 sdata->wdev.iftype = type;
1284
1285 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1286 sdata->control_port_no_encrypt = false;
1287 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1288
1289 sdata->noack_map = 0;
1290
1291 /* only monitor/p2p-device differ */
1292 if (sdata->dev) {
1293 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1294 sdata->dev->type = ARPHRD_ETHER;
1295 }
1296
1297 skb_queue_head_init(&sdata->skb_queue);
1298 INIT_WORK(&sdata->work, ieee80211_iface_work);
1299 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1300 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1301 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1302 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1303
1304 switch (type) {
1305 case NL80211_IFTYPE_P2P_GO:
1306 type = NL80211_IFTYPE_AP;
1307 sdata->vif.type = type;
1308 sdata->vif.p2p = true;
1309 /* fall through */
1310 case NL80211_IFTYPE_AP:
1311 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1312 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1313 INIT_WORK(&sdata->u.ap.request_smps_work,
1314 ieee80211_request_smps_ap_work);
1315 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1316 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1317 break;
1318 case NL80211_IFTYPE_P2P_CLIENT:
1319 type = NL80211_IFTYPE_STATION;
1320 sdata->vif.type = type;
1321 sdata->vif.p2p = true;
1322 /* fall through */
1323 case NL80211_IFTYPE_STATION:
1324 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1325 ieee80211_sta_setup_sdata(sdata);
1326 break;
1327 case NL80211_IFTYPE_ADHOC:
1328 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1329 ieee80211_ibss_setup_sdata(sdata);
1330 break;
1331 case NL80211_IFTYPE_MESH_POINT:
1332 if (ieee80211_vif_is_mesh(&sdata->vif))
1333 ieee80211_mesh_init_sdata(sdata);
1334 break;
1335 case NL80211_IFTYPE_MONITOR:
1336 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1337 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1338 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1339 MONITOR_FLAG_OTHER_BSS;
1340 break;
1341 case NL80211_IFTYPE_WDS:
1342 sdata->vif.bss_conf.bssid = NULL;
1343 break;
1344 case NL80211_IFTYPE_AP_VLAN:
1345 case NL80211_IFTYPE_P2P_DEVICE:
1346 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1347 break;
1348 case NL80211_IFTYPE_UNSPECIFIED:
1349 case NUM_NL80211_IFTYPES:
1350 BUG();
1351 break;
1352 }
1353
1354 ieee80211_debugfs_add_netdev(sdata);
1355 }
1356
1357 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1358 enum nl80211_iftype type)
1359 {
1360 struct ieee80211_local *local = sdata->local;
1361 int ret, err;
1362 enum nl80211_iftype internal_type = type;
1363 bool p2p = false;
1364
1365 ASSERT_RTNL();
1366
1367 if (!local->ops->change_interface)
1368 return -EBUSY;
1369
1370 switch (sdata->vif.type) {
1371 case NL80211_IFTYPE_AP:
1372 case NL80211_IFTYPE_STATION:
1373 case NL80211_IFTYPE_ADHOC:
1374 /*
1375 * Could maybe also all others here?
1376 * Just not sure how that interacts
1377 * with the RX/config path e.g. for
1378 * mesh.
1379 */
1380 break;
1381 default:
1382 return -EBUSY;
1383 }
1384
1385 switch (type) {
1386 case NL80211_IFTYPE_AP:
1387 case NL80211_IFTYPE_STATION:
1388 case NL80211_IFTYPE_ADHOC:
1389 /*
1390 * Could probably support everything
1391 * but WDS here (WDS do_open can fail
1392 * under memory pressure, which this
1393 * code isn't prepared to handle).
1394 */
1395 break;
1396 case NL80211_IFTYPE_P2P_CLIENT:
1397 p2p = true;
1398 internal_type = NL80211_IFTYPE_STATION;
1399 break;
1400 case NL80211_IFTYPE_P2P_GO:
1401 p2p = true;
1402 internal_type = NL80211_IFTYPE_AP;
1403 break;
1404 default:
1405 return -EBUSY;
1406 }
1407
1408 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1409 if (ret)
1410 return ret;
1411
1412 ieee80211_do_stop(sdata, false);
1413
1414 ieee80211_teardown_sdata(sdata);
1415
1416 ret = drv_change_interface(local, sdata, internal_type, p2p);
1417 if (ret)
1418 type = ieee80211_vif_type_p2p(&sdata->vif);
1419
1420 /*
1421 * Ignore return value here, there's not much we can do since
1422 * the driver changed the interface type internally already.
1423 * The warnings will hopefully make driver authors fix it :-)
1424 */
1425 ieee80211_check_queues(sdata, type);
1426
1427 ieee80211_setup_sdata(sdata, type);
1428
1429 err = ieee80211_do_open(&sdata->wdev, false);
1430 WARN(err, "type change: do_open returned %d", err);
1431
1432 return ret;
1433 }
1434
1435 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1436 enum nl80211_iftype type)
1437 {
1438 int ret;
1439
1440 ASSERT_RTNL();
1441
1442 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1443 return 0;
1444
1445 if (ieee80211_sdata_running(sdata)) {
1446 ret = ieee80211_runtime_change_iftype(sdata, type);
1447 if (ret)
1448 return ret;
1449 } else {
1450 /* Purge and reset type-dependent state. */
1451 ieee80211_teardown_sdata(sdata);
1452 ieee80211_setup_sdata(sdata, type);
1453 }
1454
1455 /* reset some values that shouldn't be kept across type changes */
1456 sdata->drop_unencrypted = 0;
1457 if (type == NL80211_IFTYPE_STATION)
1458 sdata->u.mgd.use_4addr = false;
1459
1460 return 0;
1461 }
1462
1463 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1464 u8 *perm_addr, enum nl80211_iftype type)
1465 {
1466 struct ieee80211_sub_if_data *sdata;
1467 u64 mask, start, addr, val, inc;
1468 u8 *m;
1469 u8 tmp_addr[ETH_ALEN];
1470 int i;
1471
1472 /* default ... something at least */
1473 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1474
1475 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1476 local->hw.wiphy->n_addresses <= 1)
1477 return;
1478
1479 mutex_lock(&local->iflist_mtx);
1480
1481 switch (type) {
1482 case NL80211_IFTYPE_MONITOR:
1483 /* doesn't matter */
1484 break;
1485 case NL80211_IFTYPE_WDS:
1486 case NL80211_IFTYPE_AP_VLAN:
1487 /* match up with an AP interface */
1488 list_for_each_entry(sdata, &local->interfaces, list) {
1489 if (sdata->vif.type != NL80211_IFTYPE_AP)
1490 continue;
1491 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1492 break;
1493 }
1494 /* keep default if no AP interface present */
1495 break;
1496 case NL80211_IFTYPE_P2P_CLIENT:
1497 case NL80211_IFTYPE_P2P_GO:
1498 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1499 list_for_each_entry(sdata, &local->interfaces, list) {
1500 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1501 continue;
1502 if (!ieee80211_sdata_running(sdata))
1503 continue;
1504 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1505 goto out_unlock;
1506 }
1507 }
1508 /* otherwise fall through */
1509 default:
1510 /* assign a new address if possible -- try n_addresses first */
1511 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1512 bool used = false;
1513
1514 list_for_each_entry(sdata, &local->interfaces, list) {
1515 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1516 sdata->vif.addr)) {
1517 used = true;
1518 break;
1519 }
1520 }
1521
1522 if (!used) {
1523 memcpy(perm_addr,
1524 local->hw.wiphy->addresses[i].addr,
1525 ETH_ALEN);
1526 break;
1527 }
1528 }
1529
1530 /* try mask if available */
1531 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1532 break;
1533
1534 m = local->hw.wiphy->addr_mask;
1535 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1536 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1537 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1538
1539 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1540 /* not a contiguous mask ... not handled now! */
1541 pr_info("not contiguous\n");
1542 break;
1543 }
1544
1545 /*
1546 * Pick address of existing interface in case user changed
1547 * MAC address manually, default to perm_addr.
1548 */
1549 m = local->hw.wiphy->perm_addr;
1550 list_for_each_entry(sdata, &local->interfaces, list) {
1551 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1552 continue;
1553 m = sdata->vif.addr;
1554 break;
1555 }
1556 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1557 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1558 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1559
1560 inc = 1ULL<<__ffs64(mask);
1561 val = (start & mask);
1562 addr = (start & ~mask) | (val & mask);
1563 do {
1564 bool used = false;
1565
1566 tmp_addr[5] = addr >> 0*8;
1567 tmp_addr[4] = addr >> 1*8;
1568 tmp_addr[3] = addr >> 2*8;
1569 tmp_addr[2] = addr >> 3*8;
1570 tmp_addr[1] = addr >> 4*8;
1571 tmp_addr[0] = addr >> 5*8;
1572
1573 val += inc;
1574
1575 list_for_each_entry(sdata, &local->interfaces, list) {
1576 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1577 used = true;
1578 break;
1579 }
1580 }
1581
1582 if (!used) {
1583 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1584 break;
1585 }
1586 addr = (start & ~mask) | (val & mask);
1587 } while (addr != start);
1588
1589 break;
1590 }
1591
1592 out_unlock:
1593 mutex_unlock(&local->iflist_mtx);
1594 }
1595
1596 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1597 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1598 struct vif_params *params)
1599 {
1600 struct net_device *ndev = NULL;
1601 struct ieee80211_sub_if_data *sdata = NULL;
1602 int ret, i;
1603 int txqs = 1;
1604
1605 ASSERT_RTNL();
1606
1607 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1608 struct wireless_dev *wdev;
1609
1610 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1611 GFP_KERNEL);
1612 if (!sdata)
1613 return -ENOMEM;
1614 wdev = &sdata->wdev;
1615
1616 sdata->dev = NULL;
1617 strlcpy(sdata->name, name, IFNAMSIZ);
1618 ieee80211_assign_perm_addr(local, wdev->address, type);
1619 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1620 } else {
1621 if (local->hw.queues >= IEEE80211_NUM_ACS)
1622 txqs = IEEE80211_NUM_ACS;
1623
1624 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1625 local->hw.vif_data_size,
1626 name, ieee80211_if_setup, txqs, 1);
1627 if (!ndev)
1628 return -ENOMEM;
1629 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1630
1631 ndev->needed_headroom = local->tx_headroom +
1632 4*6 /* four MAC addresses */
1633 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1634 + 6 /* mesh */
1635 + 8 /* rfc1042/bridge tunnel */
1636 - ETH_HLEN /* ethernet hard_header_len */
1637 + IEEE80211_ENCRYPT_HEADROOM;
1638 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1639
1640 ret = dev_alloc_name(ndev, ndev->name);
1641 if (ret < 0) {
1642 free_netdev(ndev);
1643 return ret;
1644 }
1645
1646 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1647 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1648 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1649
1650 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1651 sdata = netdev_priv(ndev);
1652 ndev->ieee80211_ptr = &sdata->wdev;
1653 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1654 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1655
1656 sdata->dev = ndev;
1657 }
1658
1659 /* initialise type-independent data */
1660 sdata->wdev.wiphy = local->hw.wiphy;
1661 sdata->local = local;
1662
1663 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1664 skb_queue_head_init(&sdata->fragments[i].skb_list);
1665
1666 INIT_LIST_HEAD(&sdata->key_list);
1667
1668 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1669 ieee80211_dfs_cac_timer_work);
1670 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1671 ieee80211_delayed_tailroom_dec);
1672
1673 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1674 struct ieee80211_supported_band *sband;
1675 sband = local->hw.wiphy->bands[i];
1676 sdata->rc_rateidx_mask[i] =
1677 sband ? (1 << sband->n_bitrates) - 1 : 0;
1678 if (sband)
1679 memcpy(sdata->rc_rateidx_mcs_mask[i],
1680 sband->ht_cap.mcs.rx_mask,
1681 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1682 else
1683 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1684 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1685 }
1686
1687 ieee80211_set_default_queues(sdata);
1688
1689 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1690 sdata->user_power_level = local->user_power_level;
1691
1692 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1693
1694 /* setup type-dependent data */
1695 ieee80211_setup_sdata(sdata, type);
1696
1697 if (ndev) {
1698 if (params) {
1699 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1700 if (type == NL80211_IFTYPE_STATION)
1701 sdata->u.mgd.use_4addr = params->use_4addr;
1702 }
1703
1704 ndev->features |= local->hw.netdev_features;
1705
1706 ret = register_netdevice(ndev);
1707 if (ret) {
1708 free_netdev(ndev);
1709 return ret;
1710 }
1711 }
1712
1713 mutex_lock(&local->iflist_mtx);
1714 list_add_tail_rcu(&sdata->list, &local->interfaces);
1715 mutex_unlock(&local->iflist_mtx);
1716
1717 if (new_wdev)
1718 *new_wdev = &sdata->wdev;
1719
1720 return 0;
1721 }
1722
1723 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1724 {
1725 ASSERT_RTNL();
1726
1727 mutex_lock(&sdata->local->iflist_mtx);
1728 list_del_rcu(&sdata->list);
1729 mutex_unlock(&sdata->local->iflist_mtx);
1730
1731 synchronize_rcu();
1732
1733 if (sdata->dev) {
1734 unregister_netdevice(sdata->dev);
1735 } else {
1736 cfg80211_unregister_wdev(&sdata->wdev);
1737 kfree(sdata);
1738 }
1739 }
1740
1741 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1742 {
1743 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1744 return;
1745 ieee80211_do_stop(sdata, true);
1746 ieee80211_teardown_sdata(sdata);
1747 }
1748
1749 /*
1750 * Remove all interfaces, may only be called at hardware unregistration
1751 * time because it doesn't do RCU-safe list removals.
1752 */
1753 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1754 {
1755 struct ieee80211_sub_if_data *sdata, *tmp;
1756 LIST_HEAD(unreg_list);
1757 LIST_HEAD(wdev_list);
1758
1759 ASSERT_RTNL();
1760
1761 /*
1762 * Close all AP_VLAN interfaces first, as otherwise they
1763 * might be closed while the AP interface they belong to
1764 * is closed, causing unregister_netdevice_many() to crash.
1765 */
1766 list_for_each_entry(sdata, &local->interfaces, list)
1767 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1768 dev_close(sdata->dev);
1769
1770 mutex_lock(&local->iflist_mtx);
1771 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1772 list_del(&sdata->list);
1773
1774 if (sdata->dev)
1775 unregister_netdevice_queue(sdata->dev, &unreg_list);
1776 else
1777 list_add(&sdata->list, &wdev_list);
1778 }
1779 mutex_unlock(&local->iflist_mtx);
1780 unregister_netdevice_many(&unreg_list);
1781 list_del(&unreg_list);
1782
1783 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1784 list_del(&sdata->list);
1785 cfg80211_unregister_wdev(&sdata->wdev);
1786 kfree(sdata);
1787 }
1788 }
1789
1790 static int netdev_notify(struct notifier_block *nb,
1791 unsigned long state, void *ptr)
1792 {
1793 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1794 struct ieee80211_sub_if_data *sdata;
1795
1796 if (state != NETDEV_CHANGENAME)
1797 return NOTIFY_DONE;
1798
1799 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1800 return NOTIFY_DONE;
1801
1802 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1803 return NOTIFY_DONE;
1804
1805 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1806 memcpy(sdata->name, dev->name, IFNAMSIZ);
1807 ieee80211_debugfs_rename_netdev(sdata);
1808
1809 return NOTIFY_OK;
1810 }
1811
1812 static struct notifier_block mac80211_netdev_notifier = {
1813 .notifier_call = netdev_notify,
1814 };
1815
1816 int ieee80211_iface_init(void)
1817 {
1818 return register_netdevice_notifier(&mac80211_netdev_notifier);
1819 }
1820
1821 void ieee80211_iface_exit(void)
1822 {
1823 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1824 }
Linux kernel - Deliverables
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