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Merge tag 'mac80211-next-for-john-2014-11-20' of git://git.kernel.org/pub/scm/linux...
[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 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/if_arp.h>
17 #include <linux/netdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "sta_info.h"
23 #include "debugfs_netdev.h"
24 #include "mesh.h"
25 #include "led.h"
26 #include "driver-ops.h"
27 #include "wme.h"
28 #include "rate.h"
29
30 /**
31 * DOC: Interface list locking
32 *
33 * The interface list in each struct ieee80211_local is protected
34 * three-fold:
35 *
36 * (1) modifications may only be done under the RTNL
37 * (2) modifications and readers are protected against each other by
38 * the iflist_mtx.
39 * (3) modifications are done in an RCU manner so atomic readers
40 * can traverse the list in RCU-safe blocks.
41 *
42 * As a consequence, reads (traversals) of the list can be protected
43 * by either the RTNL, the iflist_mtx or RCU.
44 */
45
46 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
47 {
48 struct ieee80211_chanctx_conf *chanctx_conf;
49 int power;
50
51 rcu_read_lock();
52 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
53 if (!chanctx_conf) {
54 rcu_read_unlock();
55 return false;
56 }
57
58 power = ieee80211_chandef_max_power(&chanctx_conf->def);
59 rcu_read_unlock();
60
61 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
62 power = min(power, sdata->user_power_level);
63
64 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
65 power = min(power, sdata->ap_power_level);
66
67 if (power != sdata->vif.bss_conf.txpower) {
68 sdata->vif.bss_conf.txpower = power;
69 ieee80211_hw_config(sdata->local, 0);
70 return true;
71 }
72
73 return false;
74 }
75
76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
77 {
78 if (__ieee80211_recalc_txpower(sdata))
79 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
80 }
81
82 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
83 {
84 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
85 return 0;
86
87 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
88 return IEEE80211_CONF_CHANGE_IDLE;
89 }
90
91 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
92 {
93 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
94 return 0;
95
96 ieee80211_flush_queues(local, NULL);
97
98 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
99 return IEEE80211_CONF_CHANGE_IDLE;
100 }
101
102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
103 bool force_active)
104 {
105 bool working, scanning, active;
106 unsigned int led_trig_start = 0, led_trig_stop = 0;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = force_active ||
111 !list_empty(&local->chanctx_list) ||
112 local->monitors;
113
114 working = !local->ops->remain_on_channel &&
115 !list_empty(&local->roc_list);
116
117 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
118 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
119
120 if (working || scanning)
121 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
122 else
123 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124
125 if (active)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129
130 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
131
132 if (working || scanning || active)
133 return __ieee80211_idle_off(local);
134 return __ieee80211_idle_on(local);
135 }
136
137 u32 ieee80211_idle_off(struct ieee80211_local *local)
138 {
139 return __ieee80211_recalc_idle(local, true);
140 }
141
142 void ieee80211_recalc_idle(struct ieee80211_local *local)
143 {
144 u32 change = __ieee80211_recalc_idle(local, false);
145 if (change)
146 ieee80211_hw_config(local, change);
147 }
148
149 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
150 {
151 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
152 return -EINVAL;
153
154 dev->mtu = new_mtu;
155 return 0;
156 }
157
158 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
159 bool check_dup)
160 {
161 struct ieee80211_local *local = sdata->local;
162 struct ieee80211_sub_if_data *iter;
163 u64 new, mask, tmp;
164 u8 *m;
165 int ret = 0;
166
167 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
168 return 0;
169
170 m = addr;
171 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174
175 m = local->hw.wiphy->addr_mask;
176 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
177 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
178 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
179
180 if (!check_dup)
181 return ret;
182
183 mutex_lock(&local->iflist_mtx);
184 list_for_each_entry(iter, &local->interfaces, list) {
185 if (iter == sdata)
186 continue;
187
188 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
189 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
190 continue;
191
192 m = iter->vif.addr;
193 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
194 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
195 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
196
197 if ((new & ~mask) != (tmp & ~mask)) {
198 ret = -EINVAL;
199 break;
200 }
201 }
202 mutex_unlock(&local->iflist_mtx);
203
204 return ret;
205 }
206
207 static int ieee80211_change_mac(struct net_device *dev, void *addr)
208 {
209 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
210 struct sockaddr *sa = addr;
211 bool check_dup = true;
212 int ret;
213
214 if (ieee80211_sdata_running(sdata))
215 return -EBUSY;
216
217 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
218 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
219 check_dup = false;
220
221 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
222 if (ret)
223 return ret;
224
225 ret = eth_mac_addr(dev, sa);
226
227 if (ret == 0)
228 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
229
230 return ret;
231 }
232
233 static inline int identical_mac_addr_allowed(int type1, int type2)
234 {
235 return type1 == NL80211_IFTYPE_MONITOR ||
236 type2 == NL80211_IFTYPE_MONITOR ||
237 type1 == NL80211_IFTYPE_P2P_DEVICE ||
238 type2 == NL80211_IFTYPE_P2P_DEVICE ||
239 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
240 (type1 == NL80211_IFTYPE_WDS &&
241 (type2 == NL80211_IFTYPE_WDS ||
242 type2 == NL80211_IFTYPE_AP)) ||
243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
244 (type1 == NL80211_IFTYPE_AP_VLAN &&
245 (type2 == NL80211_IFTYPE_AP ||
246 type2 == NL80211_IFTYPE_AP_VLAN));
247 }
248
249 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
250 enum nl80211_iftype iftype)
251 {
252 struct ieee80211_local *local = sdata->local;
253 struct ieee80211_sub_if_data *nsdata;
254 int ret;
255
256 ASSERT_RTNL();
257
258 /* we hold the RTNL here so can safely walk the list */
259 list_for_each_entry(nsdata, &local->interfaces, list) {
260 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
261 /*
262 * Only OCB and monitor mode may coexist
263 */
264 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
265 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
266 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
267 nsdata->vif.type == NL80211_IFTYPE_OCB))
268 return -EBUSY;
269
270 /*
271 * Allow only a single IBSS interface to be up at any
272 * time. This is restricted because beacon distribution
273 * cannot work properly if both are in the same IBSS.
274 *
275 * To remove this restriction we'd have to disallow them
276 * from setting the same SSID on different IBSS interfaces
277 * belonging to the same hardware. Then, however, we're
278 * faced with having to adopt two different TSF timers...
279 */
280 if (iftype == NL80211_IFTYPE_ADHOC &&
281 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
282 return -EBUSY;
283 /*
284 * will not add another interface while any channel
285 * switch is active.
286 */
287 if (nsdata->vif.csa_active)
288 return -EBUSY;
289
290 /*
291 * The remaining checks are only performed for interfaces
292 * with the same MAC address.
293 */
294 if (!ether_addr_equal(sdata->vif.addr,
295 nsdata->vif.addr))
296 continue;
297
298 /*
299 * check whether it may have the same address
300 */
301 if (!identical_mac_addr_allowed(iftype,
302 nsdata->vif.type))
303 return -ENOTUNIQ;
304
305 /*
306 * can only add VLANs to enabled APs
307 */
308 if (iftype == NL80211_IFTYPE_AP_VLAN &&
309 nsdata->vif.type == NL80211_IFTYPE_AP)
310 sdata->bss = &nsdata->u.ap;
311 }
312 }
313
314 mutex_lock(&local->chanctx_mtx);
315 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
316 mutex_unlock(&local->chanctx_mtx);
317 return ret;
318 }
319
320 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
321 enum nl80211_iftype iftype)
322 {
323 int n_queues = sdata->local->hw.queues;
324 int i;
325
326 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
327 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
328 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
329 IEEE80211_INVAL_HW_QUEUE))
330 return -EINVAL;
331 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
332 n_queues))
333 return -EINVAL;
334 }
335 }
336
337 if ((iftype != NL80211_IFTYPE_AP &&
338 iftype != NL80211_IFTYPE_P2P_GO &&
339 iftype != NL80211_IFTYPE_MESH_POINT) ||
340 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
341 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
342 return 0;
343 }
344
345 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
346 return -EINVAL;
347
348 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
349 return -EINVAL;
350
351 return 0;
352 }
353
354 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
355 const int offset)
356 {
357 struct ieee80211_local *local = sdata->local;
358 u32 flags = sdata->u.mntr_flags;
359
360 #define ADJUST(_f, _s) do { \
361 if (flags & MONITOR_FLAG_##_f) \
362 local->fif_##_s += offset; \
363 } while (0)
364
365 ADJUST(FCSFAIL, fcsfail);
366 ADJUST(PLCPFAIL, plcpfail);
367 ADJUST(CONTROL, control);
368 ADJUST(CONTROL, pspoll);
369 ADJUST(OTHER_BSS, other_bss);
370
371 #undef ADJUST
372 }
373
374 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
375 {
376 struct ieee80211_local *local = sdata->local;
377 int i;
378
379 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
380 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
381 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
382 else if (local->hw.queues >= IEEE80211_NUM_ACS)
383 sdata->vif.hw_queue[i] = i;
384 else
385 sdata->vif.hw_queue[i] = 0;
386 }
387 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
388 }
389
390 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
391 {
392 struct ieee80211_sub_if_data *sdata;
393 int ret;
394
395 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
396 return 0;
397
398 ASSERT_RTNL();
399
400 if (local->monitor_sdata)
401 return 0;
402
403 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
404 if (!sdata)
405 return -ENOMEM;
406
407 /* set up data */
408 sdata->local = local;
409 sdata->vif.type = NL80211_IFTYPE_MONITOR;
410 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
411 wiphy_name(local->hw.wiphy));
412 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
413
414 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
415
416 ieee80211_set_default_queues(sdata);
417
418 ret = drv_add_interface(local, sdata);
419 if (WARN_ON(ret)) {
420 /* ok .. stupid driver, it asked for this! */
421 kfree(sdata);
422 return ret;
423 }
424
425 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
426 if (ret) {
427 kfree(sdata);
428 return ret;
429 }
430
431 mutex_lock(&local->iflist_mtx);
432 rcu_assign_pointer(local->monitor_sdata, sdata);
433 mutex_unlock(&local->iflist_mtx);
434
435 mutex_lock(&local->mtx);
436 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
437 IEEE80211_CHANCTX_EXCLUSIVE);
438 mutex_unlock(&local->mtx);
439 if (ret) {
440 mutex_lock(&local->iflist_mtx);
441 RCU_INIT_POINTER(local->monitor_sdata, NULL);
442 mutex_unlock(&local->iflist_mtx);
443 synchronize_net();
444 drv_remove_interface(local, sdata);
445 kfree(sdata);
446 return ret;
447 }
448
449 return 0;
450 }
451
452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
453 {
454 struct ieee80211_sub_if_data *sdata;
455
456 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
457 return;
458
459 ASSERT_RTNL();
460
461 mutex_lock(&local->iflist_mtx);
462
463 sdata = rcu_dereference_protected(local->monitor_sdata,
464 lockdep_is_held(&local->iflist_mtx));
465 if (!sdata) {
466 mutex_unlock(&local->iflist_mtx);
467 return;
468 }
469
470 RCU_INIT_POINTER(local->monitor_sdata, NULL);
471 mutex_unlock(&local->iflist_mtx);
472
473 synchronize_net();
474
475 mutex_lock(&local->mtx);
476 ieee80211_vif_release_channel(sdata);
477 mutex_unlock(&local->mtx);
478
479 drv_remove_interface(local, sdata);
480
481 kfree(sdata);
482 }
483
484 /*
485 * NOTE: Be very careful when changing this function, it must NOT return
486 * an error on interface type changes that have been pre-checked, so most
487 * checks should be in ieee80211_check_concurrent_iface.
488 */
489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
490 {
491 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
492 struct net_device *dev = wdev->netdev;
493 struct ieee80211_local *local = sdata->local;
494 struct sta_info *sta;
495 u32 changed = 0;
496 int res;
497 u32 hw_reconf_flags = 0;
498
499 switch (sdata->vif.type) {
500 case NL80211_IFTYPE_WDS:
501 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
502 return -ENOLINK;
503 break;
504 case NL80211_IFTYPE_AP_VLAN: {
505 struct ieee80211_sub_if_data *master;
506
507 if (!sdata->bss)
508 return -ENOLINK;
509
510 mutex_lock(&local->mtx);
511 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
512 mutex_unlock(&local->mtx);
513
514 master = container_of(sdata->bss,
515 struct ieee80211_sub_if_data, u.ap);
516 sdata->control_port_protocol =
517 master->control_port_protocol;
518 sdata->control_port_no_encrypt =
519 master->control_port_no_encrypt;
520 sdata->vif.cab_queue = master->vif.cab_queue;
521 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
522 sizeof(sdata->vif.hw_queue));
523 break;
524 }
525 case NL80211_IFTYPE_AP:
526 sdata->bss = &sdata->u.ap;
527 break;
528 case NL80211_IFTYPE_MESH_POINT:
529 case NL80211_IFTYPE_STATION:
530 case NL80211_IFTYPE_MONITOR:
531 case NL80211_IFTYPE_ADHOC:
532 case NL80211_IFTYPE_P2P_DEVICE:
533 case NL80211_IFTYPE_OCB:
534 /* no special treatment */
535 break;
536 case NL80211_IFTYPE_UNSPECIFIED:
537 case NUM_NL80211_IFTYPES:
538 case NL80211_IFTYPE_P2P_CLIENT:
539 case NL80211_IFTYPE_P2P_GO:
540 /* cannot happen */
541 WARN_ON(1);
542 break;
543 }
544
545 if (local->open_count == 0) {
546 res = drv_start(local);
547 if (res)
548 goto err_del_bss;
549 /* we're brought up, everything changes */
550 hw_reconf_flags = ~0;
551 ieee80211_led_radio(local, true);
552 ieee80211_mod_tpt_led_trig(local,
553 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
554 }
555
556 /*
557 * Copy the hopefully now-present MAC address to
558 * this interface, if it has the special null one.
559 */
560 if (dev && is_zero_ether_addr(dev->dev_addr)) {
561 memcpy(dev->dev_addr,
562 local->hw.wiphy->perm_addr,
563 ETH_ALEN);
564 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
565
566 if (!is_valid_ether_addr(dev->dev_addr)) {
567 res = -EADDRNOTAVAIL;
568 goto err_stop;
569 }
570 }
571
572 switch (sdata->vif.type) {
573 case NL80211_IFTYPE_AP_VLAN:
574 /* no need to tell driver, but set carrier and chanctx */
575 if (rtnl_dereference(sdata->bss->beacon)) {
576 ieee80211_vif_vlan_copy_chanctx(sdata);
577 netif_carrier_on(dev);
578 } else {
579 netif_carrier_off(dev);
580 }
581 break;
582 case NL80211_IFTYPE_MONITOR:
583 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
584 local->cooked_mntrs++;
585 break;
586 }
587
588 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
589 res = drv_add_interface(local, sdata);
590 if (res)
591 goto err_stop;
592 } else if (local->monitors == 0 && local->open_count == 0) {
593 res = ieee80211_add_virtual_monitor(local);
594 if (res)
595 goto err_stop;
596 }
597
598 /* must be before the call to ieee80211_configure_filter */
599 local->monitors++;
600 if (local->monitors == 1) {
601 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
602 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
603 }
604
605 ieee80211_adjust_monitor_flags(sdata, 1);
606 ieee80211_configure_filter(local);
607 mutex_lock(&local->mtx);
608 ieee80211_recalc_idle(local);
609 mutex_unlock(&local->mtx);
610
611 netif_carrier_on(dev);
612 break;
613 default:
614 if (coming_up) {
615 ieee80211_del_virtual_monitor(local);
616
617 res = drv_add_interface(local, sdata);
618 if (res)
619 goto err_stop;
620 res = ieee80211_check_queues(sdata,
621 ieee80211_vif_type_p2p(&sdata->vif));
622 if (res)
623 goto err_del_interface;
624 }
625
626 if (sdata->vif.type == NL80211_IFTYPE_AP) {
627 local->fif_pspoll++;
628 local->fif_probe_req++;
629
630 ieee80211_configure_filter(local);
631 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
632 local->fif_probe_req++;
633 }
634
635 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
636 changed |= ieee80211_reset_erp_info(sdata);
637 ieee80211_bss_info_change_notify(sdata, changed);
638
639 switch (sdata->vif.type) {
640 case NL80211_IFTYPE_STATION:
641 case NL80211_IFTYPE_ADHOC:
642 case NL80211_IFTYPE_AP:
643 case NL80211_IFTYPE_MESH_POINT:
644 case NL80211_IFTYPE_OCB:
645 netif_carrier_off(dev);
646 break;
647 case NL80211_IFTYPE_WDS:
648 case NL80211_IFTYPE_P2P_DEVICE:
649 break;
650 default:
651 /* not reached */
652 WARN_ON(1);
653 }
654
655 /*
656 * set default queue parameters so drivers don't
657 * need to initialise the hardware if the hardware
658 * doesn't start up with sane defaults
659 */
660 ieee80211_set_wmm_default(sdata, true);
661 }
662
663 set_bit(SDATA_STATE_RUNNING, &sdata->state);
664
665 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
666 /* Create STA entry for the WDS peer */
667 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
668 GFP_KERNEL);
669 if (!sta) {
670 res = -ENOMEM;
671 goto err_del_interface;
672 }
673
674 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
675 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
676 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
677
678 res = sta_info_insert(sta);
679 if (res) {
680 /* STA has been freed */
681 goto err_del_interface;
682 }
683
684 rate_control_rate_init(sta);
685 netif_carrier_on(dev);
686 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
687 rcu_assign_pointer(local->p2p_sdata, sdata);
688 }
689
690 /*
691 * set_multicast_list will be invoked by the networking core
692 * which will check whether any increments here were done in
693 * error and sync them down to the hardware as filter flags.
694 */
695 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
696 atomic_inc(&local->iff_allmultis);
697
698 if (sdata->flags & IEEE80211_SDATA_PROMISC)
699 atomic_inc(&local->iff_promiscs);
700
701 if (coming_up)
702 local->open_count++;
703
704 if (hw_reconf_flags)
705 ieee80211_hw_config(local, hw_reconf_flags);
706
707 ieee80211_recalc_ps(local, -1);
708
709 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
710 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
711 /* XXX: for AP_VLAN, actually track AP queues */
712 netif_tx_start_all_queues(dev);
713 } else if (dev) {
714 unsigned long flags;
715 int n_acs = IEEE80211_NUM_ACS;
716 int ac;
717
718 if (local->hw.queues < IEEE80211_NUM_ACS)
719 n_acs = 1;
720
721 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
722 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
723 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
724 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
725 for (ac = 0; ac < n_acs; ac++) {
726 int ac_queue = sdata->vif.hw_queue[ac];
727
728 if (local->queue_stop_reasons[ac_queue] == 0 &&
729 skb_queue_empty(&local->pending[ac_queue]))
730 netif_start_subqueue(dev, ac);
731 }
732 }
733 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
734 }
735
736 return 0;
737 err_del_interface:
738 drv_remove_interface(local, sdata);
739 err_stop:
740 if (!local->open_count)
741 drv_stop(local);
742 err_del_bss:
743 sdata->bss = NULL;
744 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
745 mutex_lock(&local->mtx);
746 list_del(&sdata->u.vlan.list);
747 mutex_unlock(&local->mtx);
748 }
749 /* might already be clear but that doesn't matter */
750 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
751 return res;
752 }
753
754 static int ieee80211_open(struct net_device *dev)
755 {
756 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
757 int err;
758
759 /* fail early if user set an invalid address */
760 if (!is_valid_ether_addr(dev->dev_addr))
761 return -EADDRNOTAVAIL;
762
763 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
764 if (err)
765 return err;
766
767 return ieee80211_do_open(&sdata->wdev, true);
768 }
769
770 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
771 bool going_down)
772 {
773 struct ieee80211_local *local = sdata->local;
774 unsigned long flags;
775 struct sk_buff *skb, *tmp;
776 u32 hw_reconf_flags = 0;
777 int i, flushed;
778 struct ps_data *ps;
779 struct cfg80211_chan_def chandef;
780 bool cancel_scan;
781
782 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
783
784 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
785 if (cancel_scan)
786 ieee80211_scan_cancel(local);
787
788 /*
789 * Stop TX on this interface first.
790 */
791 if (sdata->dev)
792 netif_tx_stop_all_queues(sdata->dev);
793
794 ieee80211_roc_purge(local, sdata);
795
796 switch (sdata->vif.type) {
797 case NL80211_IFTYPE_STATION:
798 ieee80211_mgd_stop(sdata);
799 break;
800 case NL80211_IFTYPE_ADHOC:
801 ieee80211_ibss_stop(sdata);
802 break;
803 case NL80211_IFTYPE_AP:
804 cancel_work_sync(&sdata->u.ap.request_smps_work);
805 break;
806 default:
807 break;
808 }
809
810 /*
811 * Remove all stations associated with this interface.
812 *
813 * This must be done before calling ops->remove_interface()
814 * because otherwise we can later invoke ops->sta_notify()
815 * whenever the STAs are removed, and that invalidates driver
816 * assumptions about always getting a vif pointer that is valid
817 * (because if we remove a STA after ops->remove_interface()
818 * the driver will have removed the vif info already!)
819 *
820 * This is relevant only in WDS mode, in all other modes we've
821 * already removed all stations when disconnecting or similar,
822 * so warn otherwise.
823 */
824 flushed = sta_info_flush(sdata);
825 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
826 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
827
828 /* don't count this interface for promisc/allmulti while it is down */
829 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
830 atomic_dec(&local->iff_allmultis);
831
832 if (sdata->flags & IEEE80211_SDATA_PROMISC)
833 atomic_dec(&local->iff_promiscs);
834
835 if (sdata->vif.type == NL80211_IFTYPE_AP) {
836 local->fif_pspoll--;
837 local->fif_probe_req--;
838 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
839 local->fif_probe_req--;
840 }
841
842 if (sdata->dev) {
843 netif_addr_lock_bh(sdata->dev);
844 spin_lock_bh(&local->filter_lock);
845 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
846 sdata->dev->addr_len);
847 spin_unlock_bh(&local->filter_lock);
848 netif_addr_unlock_bh(sdata->dev);
849 }
850
851 del_timer_sync(&local->dynamic_ps_timer);
852 cancel_work_sync(&local->dynamic_ps_enable_work);
853
854 cancel_work_sync(&sdata->recalc_smps);
855 sdata_lock(sdata);
856 mutex_lock(&local->mtx);
857 sdata->vif.csa_active = false;
858 if (sdata->vif.type == NL80211_IFTYPE_STATION)
859 sdata->u.mgd.csa_waiting_bcn = false;
860 if (sdata->csa_block_tx) {
861 ieee80211_wake_vif_queues(local, sdata,
862 IEEE80211_QUEUE_STOP_REASON_CSA);
863 sdata->csa_block_tx = false;
864 }
865 mutex_unlock(&local->mtx);
866 sdata_unlock(sdata);
867
868 cancel_work_sync(&sdata->csa_finalize_work);
869
870 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
871
872 if (sdata->wdev.cac_started) {
873 chandef = sdata->vif.bss_conf.chandef;
874 WARN_ON(local->suspended);
875 mutex_lock(&local->mtx);
876 ieee80211_vif_release_channel(sdata);
877 mutex_unlock(&local->mtx);
878 cfg80211_cac_event(sdata->dev, &chandef,
879 NL80211_RADAR_CAC_ABORTED,
880 GFP_KERNEL);
881 }
882
883 /* APs need special treatment */
884 if (sdata->vif.type == NL80211_IFTYPE_AP) {
885 struct ieee80211_sub_if_data *vlan, *tmpsdata;
886
887 /* down all dependent devices, that is VLANs */
888 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
889 u.vlan.list)
890 dev_close(vlan->dev);
891 WARN_ON(!list_empty(&sdata->u.ap.vlans));
892 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
893 /* remove all packets in parent bc_buf pointing to this dev */
894 ps = &sdata->bss->ps;
895
896 spin_lock_irqsave(&ps->bc_buf.lock, flags);
897 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
898 if (skb->dev == sdata->dev) {
899 __skb_unlink(skb, &ps->bc_buf);
900 local->total_ps_buffered--;
901 ieee80211_free_txskb(&local->hw, skb);
902 }
903 }
904 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
905 }
906
907 if (going_down)
908 local->open_count--;
909
910 switch (sdata->vif.type) {
911 case NL80211_IFTYPE_AP_VLAN:
912 mutex_lock(&local->mtx);
913 list_del(&sdata->u.vlan.list);
914 mutex_unlock(&local->mtx);
915 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
916 /* see comment in the default case below */
917 ieee80211_free_keys(sdata, true);
918 /* no need to tell driver */
919 break;
920 case NL80211_IFTYPE_MONITOR:
921 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
922 local->cooked_mntrs--;
923 break;
924 }
925
926 local->monitors--;
927 if (local->monitors == 0) {
928 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
929 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
930 }
931
932 ieee80211_adjust_monitor_flags(sdata, -1);
933 break;
934 case NL80211_IFTYPE_P2P_DEVICE:
935 /* relies on synchronize_rcu() below */
936 RCU_INIT_POINTER(local->p2p_sdata, NULL);
937 /* fall through */
938 default:
939 cancel_work_sync(&sdata->work);
940 /*
941 * When we get here, the interface is marked down.
942 * Free the remaining keys, if there are any
943 * (which can happen in AP mode if userspace sets
944 * keys before the interface is operating, and maybe
945 * also in WDS mode)
946 *
947 * Force the key freeing to always synchronize_net()
948 * to wait for the RX path in case it is using this
949 * interface enqueuing frames at this very time on
950 * another CPU.
951 */
952 ieee80211_free_keys(sdata, true);
953 skb_queue_purge(&sdata->skb_queue);
954 }
955
956 sdata->bss = NULL;
957
958 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
959 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
960 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
961 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
962 if (info->control.vif == &sdata->vif) {
963 __skb_unlink(skb, &local->pending[i]);
964 ieee80211_free_txskb(&local->hw, skb);
965 }
966 }
967 }
968 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
969
970 if (local->open_count == 0)
971 ieee80211_clear_tx_pending(local);
972
973 /*
974 * If the interface goes down while suspended, presumably because
975 * the device was unplugged and that happens before our resume,
976 * then the driver is already unconfigured and the remainder of
977 * this function isn't needed.
978 * XXX: what about WoWLAN? If the device has software state, e.g.
979 * memory allocated, it might expect teardown commands from
980 * mac80211 here?
981 */
982 if (local->suspended) {
983 WARN_ON(local->wowlan);
984 WARN_ON(rtnl_dereference(local->monitor_sdata));
985 return;
986 }
987
988 switch (sdata->vif.type) {
989 case NL80211_IFTYPE_AP_VLAN:
990 break;
991 case NL80211_IFTYPE_MONITOR:
992 if (local->monitors == 0)
993 ieee80211_del_virtual_monitor(local);
994
995 mutex_lock(&local->mtx);
996 ieee80211_recalc_idle(local);
997 mutex_unlock(&local->mtx);
998
999 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1000 break;
1001
1002 /* fall through */
1003 default:
1004 if (going_down)
1005 drv_remove_interface(local, sdata);
1006 }
1007
1008 ieee80211_recalc_ps(local, -1);
1009
1010 if (cancel_scan)
1011 flush_delayed_work(&local->scan_work);
1012
1013 if (local->open_count == 0) {
1014 ieee80211_stop_device(local);
1015
1016 /* no reconfiguring after stop! */
1017 return;
1018 }
1019
1020 /* do after stop to avoid reconfiguring when we stop anyway */
1021 ieee80211_configure_filter(local);
1022 ieee80211_hw_config(local, hw_reconf_flags);
1023
1024 if (local->monitors == local->open_count)
1025 ieee80211_add_virtual_monitor(local);
1026 }
1027
1028 static int ieee80211_stop(struct net_device *dev)
1029 {
1030 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1031
1032 ieee80211_do_stop(sdata, true);
1033
1034 return 0;
1035 }
1036
1037 static void ieee80211_set_multicast_list(struct net_device *dev)
1038 {
1039 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1040 struct ieee80211_local *local = sdata->local;
1041 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1042
1043 allmulti = !!(dev->flags & IFF_ALLMULTI);
1044 promisc = !!(dev->flags & IFF_PROMISC);
1045 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1046 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1047
1048 if (allmulti != sdata_allmulti) {
1049 if (dev->flags & IFF_ALLMULTI)
1050 atomic_inc(&local->iff_allmultis);
1051 else
1052 atomic_dec(&local->iff_allmultis);
1053 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1054 }
1055
1056 if (promisc != sdata_promisc) {
1057 if (dev->flags & IFF_PROMISC)
1058 atomic_inc(&local->iff_promiscs);
1059 else
1060 atomic_dec(&local->iff_promiscs);
1061 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1062 }
1063 spin_lock_bh(&local->filter_lock);
1064 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1065 spin_unlock_bh(&local->filter_lock);
1066 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1067 }
1068
1069 /*
1070 * Called when the netdev is removed or, by the code below, before
1071 * the interface type changes.
1072 */
1073 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1074 {
1075 int i;
1076
1077 /* free extra data */
1078 ieee80211_free_keys(sdata, false);
1079
1080 ieee80211_debugfs_remove_netdev(sdata);
1081
1082 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1083 __skb_queue_purge(&sdata->fragments[i].skb_list);
1084 sdata->fragment_next = 0;
1085
1086 if (ieee80211_vif_is_mesh(&sdata->vif))
1087 mesh_rmc_free(sdata);
1088 }
1089
1090 static void ieee80211_uninit(struct net_device *dev)
1091 {
1092 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1093 }
1094
1095 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1096 struct sk_buff *skb,
1097 void *accel_priv,
1098 select_queue_fallback_t fallback)
1099 {
1100 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1101 }
1102
1103 static const struct net_device_ops ieee80211_dataif_ops = {
1104 .ndo_open = ieee80211_open,
1105 .ndo_stop = ieee80211_stop,
1106 .ndo_uninit = ieee80211_uninit,
1107 .ndo_start_xmit = ieee80211_subif_start_xmit,
1108 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1109 .ndo_change_mtu = ieee80211_change_mtu,
1110 .ndo_set_mac_address = ieee80211_change_mac,
1111 .ndo_select_queue = ieee80211_netdev_select_queue,
1112 };
1113
1114 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1115 struct sk_buff *skb,
1116 void *accel_priv,
1117 select_queue_fallback_t fallback)
1118 {
1119 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1120 struct ieee80211_local *local = sdata->local;
1121 struct ieee80211_hdr *hdr;
1122 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1123
1124 if (local->hw.queues < IEEE80211_NUM_ACS)
1125 return 0;
1126
1127 if (skb->len < 4 ||
1128 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1129 return 0; /* doesn't matter, frame will be dropped */
1130
1131 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1132
1133 return ieee80211_select_queue_80211(sdata, skb, hdr);
1134 }
1135
1136 static const struct net_device_ops ieee80211_monitorif_ops = {
1137 .ndo_open = ieee80211_open,
1138 .ndo_stop = ieee80211_stop,
1139 .ndo_uninit = ieee80211_uninit,
1140 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1141 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1142 .ndo_change_mtu = ieee80211_change_mtu,
1143 .ndo_set_mac_address = ieee80211_change_mac,
1144 .ndo_select_queue = ieee80211_monitor_select_queue,
1145 };
1146
1147 static void ieee80211_if_setup(struct net_device *dev)
1148 {
1149 ether_setup(dev);
1150 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1151 dev->netdev_ops = &ieee80211_dataif_ops;
1152 dev->destructor = free_netdev;
1153 }
1154
1155 static void ieee80211_iface_work(struct work_struct *work)
1156 {
1157 struct ieee80211_sub_if_data *sdata =
1158 container_of(work, struct ieee80211_sub_if_data, work);
1159 struct ieee80211_local *local = sdata->local;
1160 struct sk_buff *skb;
1161 struct sta_info *sta;
1162 struct ieee80211_ra_tid *ra_tid;
1163 struct ieee80211_rx_agg *rx_agg;
1164
1165 if (!ieee80211_sdata_running(sdata))
1166 return;
1167
1168 if (local->scanning)
1169 return;
1170
1171 /*
1172 * ieee80211_queue_work() should have picked up most cases,
1173 * here we'll pick the rest.
1174 */
1175 if (WARN(local->suspended,
1176 "interface work scheduled while going to suspend\n"))
1177 return;
1178
1179 /* first process frames */
1180 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1181 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1182
1183 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1184 ra_tid = (void *)&skb->cb;
1185 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1186 ra_tid->tid);
1187 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1188 ra_tid = (void *)&skb->cb;
1189 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1190 ra_tid->tid);
1191 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1192 rx_agg = (void *)&skb->cb;
1193 mutex_lock(&local->sta_mtx);
1194 sta = sta_info_get_bss(sdata, rx_agg->addr);
1195 if (sta)
1196 __ieee80211_start_rx_ba_session(sta,
1197 0, 0, 0, 1, rx_agg->tid,
1198 IEEE80211_MAX_AMPDU_BUF,
1199 false, true);
1200 mutex_unlock(&local->sta_mtx);
1201 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1202 rx_agg = (void *)&skb->cb;
1203 mutex_lock(&local->sta_mtx);
1204 sta = sta_info_get_bss(sdata, rx_agg->addr);
1205 if (sta)
1206 __ieee80211_stop_rx_ba_session(sta,
1207 rx_agg->tid,
1208 WLAN_BACK_RECIPIENT, 0,
1209 false);
1210 mutex_unlock(&local->sta_mtx);
1211 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1212 ieee80211_process_tdls_channel_switch(sdata, skb);
1213 } else if (ieee80211_is_action(mgmt->frame_control) &&
1214 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1215 int len = skb->len;
1216
1217 mutex_lock(&local->sta_mtx);
1218 sta = sta_info_get_bss(sdata, mgmt->sa);
1219 if (sta) {
1220 switch (mgmt->u.action.u.addba_req.action_code) {
1221 case WLAN_ACTION_ADDBA_REQ:
1222 ieee80211_process_addba_request(
1223 local, sta, mgmt, len);
1224 break;
1225 case WLAN_ACTION_ADDBA_RESP:
1226 ieee80211_process_addba_resp(local, sta,
1227 mgmt, len);
1228 break;
1229 case WLAN_ACTION_DELBA:
1230 ieee80211_process_delba(sdata, sta,
1231 mgmt, len);
1232 break;
1233 default:
1234 WARN_ON(1);
1235 break;
1236 }
1237 }
1238 mutex_unlock(&local->sta_mtx);
1239 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1240 struct ieee80211_hdr *hdr = (void *)mgmt;
1241 /*
1242 * So the frame isn't mgmt, but frame_control
1243 * is at the right place anyway, of course, so
1244 * the if statement is correct.
1245 *
1246 * Warn if we have other data frame types here,
1247 * they must not get here.
1248 */
1249 WARN_ON(hdr->frame_control &
1250 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1251 WARN_ON(!(hdr->seq_ctrl &
1252 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1253 /*
1254 * This was a fragment of a frame, received while
1255 * a block-ack session was active. That cannot be
1256 * right, so terminate the session.
1257 */
1258 mutex_lock(&local->sta_mtx);
1259 sta = sta_info_get_bss(sdata, mgmt->sa);
1260 if (sta) {
1261 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1262 IEEE80211_QOS_CTL_TID_MASK;
1263
1264 __ieee80211_stop_rx_ba_session(
1265 sta, tid, WLAN_BACK_RECIPIENT,
1266 WLAN_REASON_QSTA_REQUIRE_SETUP,
1267 true);
1268 }
1269 mutex_unlock(&local->sta_mtx);
1270 } else switch (sdata->vif.type) {
1271 case NL80211_IFTYPE_STATION:
1272 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1273 break;
1274 case NL80211_IFTYPE_ADHOC:
1275 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1276 break;
1277 case NL80211_IFTYPE_MESH_POINT:
1278 if (!ieee80211_vif_is_mesh(&sdata->vif))
1279 break;
1280 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1281 break;
1282 default:
1283 WARN(1, "frame for unexpected interface type");
1284 break;
1285 }
1286
1287 kfree_skb(skb);
1288 }
1289
1290 /* then other type-dependent work */
1291 switch (sdata->vif.type) {
1292 case NL80211_IFTYPE_STATION:
1293 ieee80211_sta_work(sdata);
1294 break;
1295 case NL80211_IFTYPE_ADHOC:
1296 ieee80211_ibss_work(sdata);
1297 break;
1298 case NL80211_IFTYPE_MESH_POINT:
1299 if (!ieee80211_vif_is_mesh(&sdata->vif))
1300 break;
1301 ieee80211_mesh_work(sdata);
1302 break;
1303 case NL80211_IFTYPE_OCB:
1304 ieee80211_ocb_work(sdata);
1305 break;
1306 default:
1307 break;
1308 }
1309 }
1310
1311 static void ieee80211_recalc_smps_work(struct work_struct *work)
1312 {
1313 struct ieee80211_sub_if_data *sdata =
1314 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1315
1316 ieee80211_recalc_smps(sdata);
1317 }
1318
1319 /*
1320 * Helper function to initialise an interface to a specific type.
1321 */
1322 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1323 enum nl80211_iftype type)
1324 {
1325 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1326 0xff, 0xff, 0xff};
1327
1328 /* clear type-dependent union */
1329 memset(&sdata->u, 0, sizeof(sdata->u));
1330
1331 /* and set some type-dependent values */
1332 sdata->vif.type = type;
1333 sdata->vif.p2p = false;
1334 sdata->wdev.iftype = type;
1335
1336 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1337 sdata->control_port_no_encrypt = false;
1338 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1339 sdata->vif.bss_conf.idle = true;
1340
1341 sdata->noack_map = 0;
1342
1343 /* only monitor/p2p-device differ */
1344 if (sdata->dev) {
1345 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1346 sdata->dev->type = ARPHRD_ETHER;
1347 }
1348
1349 skb_queue_head_init(&sdata->skb_queue);
1350 INIT_WORK(&sdata->work, ieee80211_iface_work);
1351 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1352 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1353 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1354 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1355
1356 switch (type) {
1357 case NL80211_IFTYPE_P2P_GO:
1358 type = NL80211_IFTYPE_AP;
1359 sdata->vif.type = type;
1360 sdata->vif.p2p = true;
1361 /* fall through */
1362 case NL80211_IFTYPE_AP:
1363 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1364 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1365 INIT_WORK(&sdata->u.ap.request_smps_work,
1366 ieee80211_request_smps_ap_work);
1367 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1368 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1369 break;
1370 case NL80211_IFTYPE_P2P_CLIENT:
1371 type = NL80211_IFTYPE_STATION;
1372 sdata->vif.type = type;
1373 sdata->vif.p2p = true;
1374 /* fall through */
1375 case NL80211_IFTYPE_STATION:
1376 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1377 ieee80211_sta_setup_sdata(sdata);
1378 break;
1379 case NL80211_IFTYPE_OCB:
1380 sdata->vif.bss_conf.bssid = bssid_wildcard;
1381 ieee80211_ocb_setup_sdata(sdata);
1382 break;
1383 case NL80211_IFTYPE_ADHOC:
1384 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1385 ieee80211_ibss_setup_sdata(sdata);
1386 break;
1387 case NL80211_IFTYPE_MESH_POINT:
1388 if (ieee80211_vif_is_mesh(&sdata->vif))
1389 ieee80211_mesh_init_sdata(sdata);
1390 break;
1391 case NL80211_IFTYPE_MONITOR:
1392 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1393 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1394 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1395 MONITOR_FLAG_OTHER_BSS;
1396 break;
1397 case NL80211_IFTYPE_WDS:
1398 sdata->vif.bss_conf.bssid = NULL;
1399 break;
1400 case NL80211_IFTYPE_AP_VLAN:
1401 case NL80211_IFTYPE_P2P_DEVICE:
1402 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1403 break;
1404 case NL80211_IFTYPE_UNSPECIFIED:
1405 case NUM_NL80211_IFTYPES:
1406 BUG();
1407 break;
1408 }
1409
1410 ieee80211_debugfs_add_netdev(sdata);
1411 }
1412
1413 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1414 enum nl80211_iftype type)
1415 {
1416 struct ieee80211_local *local = sdata->local;
1417 int ret, err;
1418 enum nl80211_iftype internal_type = type;
1419 bool p2p = false;
1420
1421 ASSERT_RTNL();
1422
1423 if (!local->ops->change_interface)
1424 return -EBUSY;
1425
1426 switch (sdata->vif.type) {
1427 case NL80211_IFTYPE_AP:
1428 case NL80211_IFTYPE_STATION:
1429 case NL80211_IFTYPE_ADHOC:
1430 case NL80211_IFTYPE_OCB:
1431 /*
1432 * Could maybe also all others here?
1433 * Just not sure how that interacts
1434 * with the RX/config path e.g. for
1435 * mesh.
1436 */
1437 break;
1438 default:
1439 return -EBUSY;
1440 }
1441
1442 switch (type) {
1443 case NL80211_IFTYPE_AP:
1444 case NL80211_IFTYPE_STATION:
1445 case NL80211_IFTYPE_ADHOC:
1446 case NL80211_IFTYPE_OCB:
1447 /*
1448 * Could probably support everything
1449 * but WDS here (WDS do_open can fail
1450 * under memory pressure, which this
1451 * code isn't prepared to handle).
1452 */
1453 break;
1454 case NL80211_IFTYPE_P2P_CLIENT:
1455 p2p = true;
1456 internal_type = NL80211_IFTYPE_STATION;
1457 break;
1458 case NL80211_IFTYPE_P2P_GO:
1459 p2p = true;
1460 internal_type = NL80211_IFTYPE_AP;
1461 break;
1462 default:
1463 return -EBUSY;
1464 }
1465
1466 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1467 if (ret)
1468 return ret;
1469
1470 ieee80211_do_stop(sdata, false);
1471
1472 ieee80211_teardown_sdata(sdata);
1473
1474 ret = drv_change_interface(local, sdata, internal_type, p2p);
1475 if (ret)
1476 type = ieee80211_vif_type_p2p(&sdata->vif);
1477
1478 /*
1479 * Ignore return value here, there's not much we can do since
1480 * the driver changed the interface type internally already.
1481 * The warnings will hopefully make driver authors fix it :-)
1482 */
1483 ieee80211_check_queues(sdata, type);
1484
1485 ieee80211_setup_sdata(sdata, type);
1486
1487 err = ieee80211_do_open(&sdata->wdev, false);
1488 WARN(err, "type change: do_open returned %d", err);
1489
1490 return ret;
1491 }
1492
1493 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1494 enum nl80211_iftype type)
1495 {
1496 int ret;
1497
1498 ASSERT_RTNL();
1499
1500 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1501 return 0;
1502
1503 if (ieee80211_sdata_running(sdata)) {
1504 ret = ieee80211_runtime_change_iftype(sdata, type);
1505 if (ret)
1506 return ret;
1507 } else {
1508 /* Purge and reset type-dependent state. */
1509 ieee80211_teardown_sdata(sdata);
1510 ieee80211_setup_sdata(sdata, type);
1511 }
1512
1513 /* reset some values that shouldn't be kept across type changes */
1514 sdata->drop_unencrypted = 0;
1515 if (type == NL80211_IFTYPE_STATION)
1516 sdata->u.mgd.use_4addr = false;
1517
1518 return 0;
1519 }
1520
1521 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1522 u8 *perm_addr, enum nl80211_iftype type)
1523 {
1524 struct ieee80211_sub_if_data *sdata;
1525 u64 mask, start, addr, val, inc;
1526 u8 *m;
1527 u8 tmp_addr[ETH_ALEN];
1528 int i;
1529
1530 /* default ... something at least */
1531 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1532
1533 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1534 local->hw.wiphy->n_addresses <= 1)
1535 return;
1536
1537 mutex_lock(&local->iflist_mtx);
1538
1539 switch (type) {
1540 case NL80211_IFTYPE_MONITOR:
1541 /* doesn't matter */
1542 break;
1543 case NL80211_IFTYPE_WDS:
1544 case NL80211_IFTYPE_AP_VLAN:
1545 /* match up with an AP interface */
1546 list_for_each_entry(sdata, &local->interfaces, list) {
1547 if (sdata->vif.type != NL80211_IFTYPE_AP)
1548 continue;
1549 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1550 break;
1551 }
1552 /* keep default if no AP interface present */
1553 break;
1554 case NL80211_IFTYPE_P2P_CLIENT:
1555 case NL80211_IFTYPE_P2P_GO:
1556 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1557 list_for_each_entry(sdata, &local->interfaces, list) {
1558 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1559 continue;
1560 if (!ieee80211_sdata_running(sdata))
1561 continue;
1562 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1563 goto out_unlock;
1564 }
1565 }
1566 /* otherwise fall through */
1567 default:
1568 /* assign a new address if possible -- try n_addresses first */
1569 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1570 bool used = false;
1571
1572 list_for_each_entry(sdata, &local->interfaces, list) {
1573 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1574 sdata->vif.addr)) {
1575 used = true;
1576 break;
1577 }
1578 }
1579
1580 if (!used) {
1581 memcpy(perm_addr,
1582 local->hw.wiphy->addresses[i].addr,
1583 ETH_ALEN);
1584 break;
1585 }
1586 }
1587
1588 /* try mask if available */
1589 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1590 break;
1591
1592 m = local->hw.wiphy->addr_mask;
1593 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1594 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1595 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1596
1597 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1598 /* not a contiguous mask ... not handled now! */
1599 pr_info("not contiguous\n");
1600 break;
1601 }
1602
1603 /*
1604 * Pick address of existing interface in case user changed
1605 * MAC address manually, default to perm_addr.
1606 */
1607 m = local->hw.wiphy->perm_addr;
1608 list_for_each_entry(sdata, &local->interfaces, list) {
1609 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1610 continue;
1611 m = sdata->vif.addr;
1612 break;
1613 }
1614 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1615 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1616 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1617
1618 inc = 1ULL<<__ffs64(mask);
1619 val = (start & mask);
1620 addr = (start & ~mask) | (val & mask);
1621 do {
1622 bool used = false;
1623
1624 tmp_addr[5] = addr >> 0*8;
1625 tmp_addr[4] = addr >> 1*8;
1626 tmp_addr[3] = addr >> 2*8;
1627 tmp_addr[2] = addr >> 3*8;
1628 tmp_addr[1] = addr >> 4*8;
1629 tmp_addr[0] = addr >> 5*8;
1630
1631 val += inc;
1632
1633 list_for_each_entry(sdata, &local->interfaces, list) {
1634 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1635 used = true;
1636 break;
1637 }
1638 }
1639
1640 if (!used) {
1641 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1642 break;
1643 }
1644 addr = (start & ~mask) | (val & mask);
1645 } while (addr != start);
1646
1647 break;
1648 }
1649
1650 out_unlock:
1651 mutex_unlock(&local->iflist_mtx);
1652 }
1653
1654 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1655 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1656 struct vif_params *params)
1657 {
1658 struct net_device *ndev = NULL;
1659 struct ieee80211_sub_if_data *sdata = NULL;
1660 int ret, i;
1661 int txqs = 1;
1662
1663 ASSERT_RTNL();
1664
1665 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1666 struct wireless_dev *wdev;
1667
1668 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1669 GFP_KERNEL);
1670 if (!sdata)
1671 return -ENOMEM;
1672 wdev = &sdata->wdev;
1673
1674 sdata->dev = NULL;
1675 strlcpy(sdata->name, name, IFNAMSIZ);
1676 ieee80211_assign_perm_addr(local, wdev->address, type);
1677 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1678 } else {
1679 if (local->hw.queues >= IEEE80211_NUM_ACS)
1680 txqs = IEEE80211_NUM_ACS;
1681
1682 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1683 name, NET_NAME_UNKNOWN,
1684 ieee80211_if_setup, txqs, 1);
1685 if (!ndev)
1686 return -ENOMEM;
1687 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1688
1689 ndev->needed_headroom = local->tx_headroom +
1690 4*6 /* four MAC addresses */
1691 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1692 + 6 /* mesh */
1693 + 8 /* rfc1042/bridge tunnel */
1694 - ETH_HLEN /* ethernet hard_header_len */
1695 + IEEE80211_ENCRYPT_HEADROOM;
1696 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1697
1698 ret = dev_alloc_name(ndev, ndev->name);
1699 if (ret < 0) {
1700 free_netdev(ndev);
1701 return ret;
1702 }
1703
1704 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1705 if (params && is_valid_ether_addr(params->macaddr))
1706 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1707 else
1708 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1709 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1710
1711 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1712 sdata = netdev_priv(ndev);
1713 ndev->ieee80211_ptr = &sdata->wdev;
1714 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1715 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1716
1717 sdata->dev = ndev;
1718 }
1719
1720 /* initialise type-independent data */
1721 sdata->wdev.wiphy = local->hw.wiphy;
1722 sdata->local = local;
1723
1724 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1725 skb_queue_head_init(&sdata->fragments[i].skb_list);
1726
1727 INIT_LIST_HEAD(&sdata->key_list);
1728
1729 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1730 ieee80211_dfs_cac_timer_work);
1731 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1732 ieee80211_delayed_tailroom_dec);
1733
1734 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1735 struct ieee80211_supported_band *sband;
1736 sband = local->hw.wiphy->bands[i];
1737 sdata->rc_rateidx_mask[i] =
1738 sband ? (1 << sband->n_bitrates) - 1 : 0;
1739 if (sband)
1740 memcpy(sdata->rc_rateidx_mcs_mask[i],
1741 sband->ht_cap.mcs.rx_mask,
1742 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1743 else
1744 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1745 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1746 }
1747
1748 ieee80211_set_default_queues(sdata);
1749
1750 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1751 sdata->user_power_level = local->user_power_level;
1752
1753 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1754
1755 /* setup type-dependent data */
1756 ieee80211_setup_sdata(sdata, type);
1757
1758 if (ndev) {
1759 if (params) {
1760 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1761 if (type == NL80211_IFTYPE_STATION)
1762 sdata->u.mgd.use_4addr = params->use_4addr;
1763 }
1764
1765 ndev->features |= local->hw.netdev_features;
1766
1767 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1768
1769 ret = register_netdevice(ndev);
1770 if (ret) {
1771 free_netdev(ndev);
1772 return ret;
1773 }
1774 }
1775
1776 mutex_lock(&local->iflist_mtx);
1777 list_add_tail_rcu(&sdata->list, &local->interfaces);
1778 mutex_unlock(&local->iflist_mtx);
1779
1780 if (new_wdev)
1781 *new_wdev = &sdata->wdev;
1782
1783 return 0;
1784 }
1785
1786 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1787 {
1788 ASSERT_RTNL();
1789
1790 mutex_lock(&sdata->local->iflist_mtx);
1791 list_del_rcu(&sdata->list);
1792 mutex_unlock(&sdata->local->iflist_mtx);
1793
1794 synchronize_rcu();
1795
1796 if (sdata->dev) {
1797 unregister_netdevice(sdata->dev);
1798 } else {
1799 cfg80211_unregister_wdev(&sdata->wdev);
1800 kfree(sdata);
1801 }
1802 }
1803
1804 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1805 {
1806 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1807 return;
1808 ieee80211_do_stop(sdata, true);
1809 ieee80211_teardown_sdata(sdata);
1810 }
1811
1812 /*
1813 * Remove all interfaces, may only be called at hardware unregistration
1814 * time because it doesn't do RCU-safe list removals.
1815 */
1816 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1817 {
1818 struct ieee80211_sub_if_data *sdata, *tmp;
1819 LIST_HEAD(unreg_list);
1820 LIST_HEAD(wdev_list);
1821
1822 ASSERT_RTNL();
1823
1824 /*
1825 * Close all AP_VLAN interfaces first, as otherwise they
1826 * might be closed while the AP interface they belong to
1827 * is closed, causing unregister_netdevice_many() to crash.
1828 */
1829 list_for_each_entry(sdata, &local->interfaces, list)
1830 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1831 dev_close(sdata->dev);
1832
1833 mutex_lock(&local->iflist_mtx);
1834 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1835 list_del(&sdata->list);
1836
1837 if (sdata->dev)
1838 unregister_netdevice_queue(sdata->dev, &unreg_list);
1839 else
1840 list_add(&sdata->list, &wdev_list);
1841 }
1842 mutex_unlock(&local->iflist_mtx);
1843 unregister_netdevice_many(&unreg_list);
1844
1845 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1846 list_del(&sdata->list);
1847 cfg80211_unregister_wdev(&sdata->wdev);
1848 kfree(sdata);
1849 }
1850 }
1851
1852 static int netdev_notify(struct notifier_block *nb,
1853 unsigned long state, void *ptr)
1854 {
1855 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1856 struct ieee80211_sub_if_data *sdata;
1857
1858 if (state != NETDEV_CHANGENAME)
1859 return NOTIFY_DONE;
1860
1861 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1862 return NOTIFY_DONE;
1863
1864 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1865 return NOTIFY_DONE;
1866
1867 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1868 memcpy(sdata->name, dev->name, IFNAMSIZ);
1869 ieee80211_debugfs_rename_netdev(sdata);
1870
1871 return NOTIFY_OK;
1872 }
1873
1874 static struct notifier_block mac80211_netdev_notifier = {
1875 .notifier_call = netdev_notify,
1876 };
1877
1878 int ieee80211_iface_init(void)
1879 {
1880 return register_netdevice_notifier(&mac80211_netdev_notifier);
1881 }
1882
1883 void ieee80211_iface_exit(void)
1884 {
1885 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1886 }
Linux kernel - Deliverables
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