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x86: mm: restore original pte_special check
[linux-2.6/btrfs-unstable.git] / net / mac80211 / iface.c
blob81a27516813e2f3473bec783ef9253b54967e62d
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 bool update_bss)
78 {
79 if (__ieee80211_recalc_txpower(sdata) || update_bss)
80 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
81 }
82
83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
84 {
85 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
86 return 0;
87
88 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
89 return IEEE80211_CONF_CHANGE_IDLE;
90 }
91
92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
93 {
94 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
95 return 0;
96
97 ieee80211_flush_queues(local, NULL, false);
98
99 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
100 return IEEE80211_CONF_CHANGE_IDLE;
101 }
102
103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
104 bool force_active)
105 {
106 bool working, scanning, active;
107 unsigned int led_trig_start = 0, led_trig_stop = 0;
108
109 lockdep_assert_held(&local->mtx);
110
111 active = force_active ||
112 !list_empty(&local->chanctx_list) ||
113 local->monitors;
114
115 working = !local->ops->remain_on_channel &&
116 !list_empty(&local->roc_list);
117
118 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
119 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
120
121 if (working || scanning)
122 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
123 else
124 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125
126 if (active)
127 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
128 else
129 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130
131 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
132
133 if (working || scanning || active)
134 return __ieee80211_idle_off(local);
135 return __ieee80211_idle_on(local);
136 }
137
138 u32 ieee80211_idle_off(struct ieee80211_local *local)
139 {
140 return __ieee80211_recalc_idle(local, true);
141 }
142
143 void ieee80211_recalc_idle(struct ieee80211_local *local)
144 {
145 u32 change = __ieee80211_recalc_idle(local, false);
146 if (change)
147 ieee80211_hw_config(local, change);
148 }
149
150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
151 {
152 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
153 return -EINVAL;
154
155 dev->mtu = new_mtu;
156 return 0;
157 }
158
159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
160 bool check_dup)
161 {
162 struct ieee80211_local *local = sdata->local;
163 struct ieee80211_sub_if_data *iter;
164 u64 new, mask, tmp;
165 u8 *m;
166 int ret = 0;
167
168 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
169 return 0;
170
171 m = addr;
172 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175
176 m = local->hw.wiphy->addr_mask;
177 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
178 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
179 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
180
181 if (!check_dup)
182 return ret;
183
184 mutex_lock(&local->iflist_mtx);
185 list_for_each_entry(iter, &local->interfaces, list) {
186 if (iter == sdata)
187 continue;
188
189 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
190 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
191 continue;
192
193 m = iter->vif.addr;
194 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
195 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
196 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
197
198 if ((new & ~mask) != (tmp & ~mask)) {
199 ret = -EINVAL;
200 break;
201 }
202 }
203 mutex_unlock(&local->iflist_mtx);
204
205 return ret;
206 }
207
208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
209 {
210 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
211 struct sockaddr *sa = addr;
212 bool check_dup = true;
213 int ret;
214
215 if (ieee80211_sdata_running(sdata))
216 return -EBUSY;
217
218 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
219 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
220 check_dup = false;
221
222 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
223 if (ret)
224 return ret;
225
226 ret = eth_mac_addr(dev, sa);
227
228 if (ret == 0)
229 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
230
231 return ret;
232 }
233
234 static inline int identical_mac_addr_allowed(int type1, int type2)
235 {
236 return type1 == NL80211_IFTYPE_MONITOR ||
237 type2 == NL80211_IFTYPE_MONITOR ||
238 type1 == NL80211_IFTYPE_P2P_DEVICE ||
239 type2 == NL80211_IFTYPE_P2P_DEVICE ||
240 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
241 (type1 == NL80211_IFTYPE_WDS &&
242 (type2 == NL80211_IFTYPE_WDS ||
243 type2 == NL80211_IFTYPE_AP)) ||
244 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
245 (type1 == NL80211_IFTYPE_AP_VLAN &&
246 (type2 == NL80211_IFTYPE_AP ||
247 type2 == NL80211_IFTYPE_AP_VLAN));
248 }
249
250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
251 enum nl80211_iftype iftype)
252 {
253 struct ieee80211_local *local = sdata->local;
254 struct ieee80211_sub_if_data *nsdata;
255 int ret;
256
257 ASSERT_RTNL();
258
259 /* we hold the RTNL here so can safely walk the list */
260 list_for_each_entry(nsdata, &local->interfaces, list) {
261 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
262 /*
263 * Only OCB and monitor mode may coexist
264 */
265 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
266 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
267 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
268 nsdata->vif.type == NL80211_IFTYPE_OCB))
269 return -EBUSY;
270
271 /*
272 * Allow only a single IBSS interface to be up at any
273 * time. This is restricted because beacon distribution
274 * cannot work properly if both are in the same IBSS.
275 *
276 * To remove this restriction we'd have to disallow them
277 * from setting the same SSID on different IBSS interfaces
278 * belonging to the same hardware. Then, however, we're
279 * faced with having to adopt two different TSF timers...
280 */
281 if (iftype == NL80211_IFTYPE_ADHOC &&
282 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
283 return -EBUSY;
284 /*
285 * will not add another interface while any channel
286 * switch is active.
287 */
288 if (nsdata->vif.csa_active)
289 return -EBUSY;
290
291 /*
292 * The remaining checks are only performed for interfaces
293 * with the same MAC address.
294 */
295 if (!ether_addr_equal(sdata->vif.addr,
296 nsdata->vif.addr))
297 continue;
298
299 /*
300 * check whether it may have the same address
301 */
302 if (!identical_mac_addr_allowed(iftype,
303 nsdata->vif.type))
304 return -ENOTUNIQ;
305
306 /*
307 * can only add VLANs to enabled APs
308 */
309 if (iftype == NL80211_IFTYPE_AP_VLAN &&
310 nsdata->vif.type == NL80211_IFTYPE_AP)
311 sdata->bss = &nsdata->u.ap;
312 }
313 }
314
315 mutex_lock(&local->chanctx_mtx);
316 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
317 mutex_unlock(&local->chanctx_mtx);
318 return ret;
319 }
320
321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
322 enum nl80211_iftype iftype)
323 {
324 int n_queues = sdata->local->hw.queues;
325 int i;
326
327 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
328 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
329 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
330 IEEE80211_INVAL_HW_QUEUE))
331 return -EINVAL;
332 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
333 n_queues))
334 return -EINVAL;
335 }
336 }
337
338 if ((iftype != NL80211_IFTYPE_AP &&
339 iftype != NL80211_IFTYPE_P2P_GO &&
340 iftype != NL80211_IFTYPE_MESH_POINT) ||
341 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
342 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
343 return 0;
344 }
345
346 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
347 return -EINVAL;
348
349 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
350 return -EINVAL;
351
352 return 0;
353 }
354
355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
356 const int offset)
357 {
358 struct ieee80211_local *local = sdata->local;
359 u32 flags = sdata->u.mntr_flags;
360
361 #define ADJUST(_f, _s) do { \
362 if (flags & MONITOR_FLAG_##_f) \
363 local->fif_##_s += offset; \
364 } while (0)
365
366 ADJUST(FCSFAIL, fcsfail);
367 ADJUST(PLCPFAIL, plcpfail);
368 ADJUST(CONTROL, control);
369 ADJUST(CONTROL, pspoll);
370 ADJUST(OTHER_BSS, other_bss);
371
372 #undef ADJUST
373 }
374
375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
376 {
377 struct ieee80211_local *local = sdata->local;
378 int i;
379
380 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
381 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
382 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
383 else if (local->hw.queues >= IEEE80211_NUM_ACS)
384 sdata->vif.hw_queue[i] = i;
385 else
386 sdata->vif.hw_queue[i] = 0;
387 }
388 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
389 }
390
391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
392 {
393 struct ieee80211_sub_if_data *sdata;
394 int ret;
395
396 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
397 return 0;
398
399 ASSERT_RTNL();
400
401 if (local->monitor_sdata)
402 return 0;
403
404 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
405 if (!sdata)
406 return -ENOMEM;
407
408 /* set up data */
409 sdata->local = local;
410 sdata->vif.type = NL80211_IFTYPE_MONITOR;
411 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
412 wiphy_name(local->hw.wiphy));
413 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
414
415 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
416
417 ieee80211_set_default_queues(sdata);
418
419 ret = drv_add_interface(local, sdata);
420 if (WARN_ON(ret)) {
421 /* ok .. stupid driver, it asked for this! */
422 kfree(sdata);
423 return ret;
424 }
425
426 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
427 if (ret) {
428 kfree(sdata);
429 return ret;
430 }
431
432 mutex_lock(&local->iflist_mtx);
433 rcu_assign_pointer(local->monitor_sdata, sdata);
434 mutex_unlock(&local->iflist_mtx);
435
436 mutex_lock(&local->mtx);
437 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
438 IEEE80211_CHANCTX_EXCLUSIVE);
439 mutex_unlock(&local->mtx);
440 if (ret) {
441 mutex_lock(&local->iflist_mtx);
442 RCU_INIT_POINTER(local->monitor_sdata, NULL);
443 mutex_unlock(&local->iflist_mtx);
444 synchronize_net();
445 drv_remove_interface(local, sdata);
446 kfree(sdata);
447 return ret;
448 }
449
450 return 0;
451 }
452
453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
454 {
455 struct ieee80211_sub_if_data *sdata;
456
457 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
458 return;
459
460 ASSERT_RTNL();
461
462 mutex_lock(&local->iflist_mtx);
463
464 sdata = rcu_dereference_protected(local->monitor_sdata,
465 lockdep_is_held(&local->iflist_mtx));
466 if (!sdata) {
467 mutex_unlock(&local->iflist_mtx);
468 return;
469 }
470
471 RCU_INIT_POINTER(local->monitor_sdata, NULL);
472 mutex_unlock(&local->iflist_mtx);
473
474 synchronize_net();
475
476 mutex_lock(&local->mtx);
477 ieee80211_vif_release_channel(sdata);
478 mutex_unlock(&local->mtx);
479
480 drv_remove_interface(local, sdata);
481
482 kfree(sdata);
483 }
484
485 /*
486 * NOTE: Be very careful when changing this function, it must NOT return
487 * an error on interface type changes that have been pre-checked, so most
488 * checks should be in ieee80211_check_concurrent_iface.
489 */
490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
491 {
492 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
493 struct net_device *dev = wdev->netdev;
494 struct ieee80211_local *local = sdata->local;
495 struct sta_info *sta;
496 u32 changed = 0;
497 int res;
498 u32 hw_reconf_flags = 0;
499
500 switch (sdata->vif.type) {
501 case NL80211_IFTYPE_WDS:
502 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
503 return -ENOLINK;
504 break;
505 case NL80211_IFTYPE_AP_VLAN: {
506 struct ieee80211_sub_if_data *master;
507
508 if (!sdata->bss)
509 return -ENOLINK;
510
511 mutex_lock(&local->mtx);
512 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
513 mutex_unlock(&local->mtx);
514
515 master = container_of(sdata->bss,
516 struct ieee80211_sub_if_data, u.ap);
517 sdata->control_port_protocol =
518 master->control_port_protocol;
519 sdata->control_port_no_encrypt =
520 master->control_port_no_encrypt;
521 sdata->vif.cab_queue = master->vif.cab_queue;
522 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
523 sizeof(sdata->vif.hw_queue));
524 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
525 break;
526 }
527 case NL80211_IFTYPE_AP:
528 sdata->bss = &sdata->u.ap;
529 break;
530 case NL80211_IFTYPE_MESH_POINT:
531 case NL80211_IFTYPE_STATION:
532 case NL80211_IFTYPE_MONITOR:
533 case NL80211_IFTYPE_ADHOC:
534 case NL80211_IFTYPE_P2P_DEVICE:
535 case NL80211_IFTYPE_OCB:
536 /* no special treatment */
537 break;
538 case NL80211_IFTYPE_UNSPECIFIED:
539 case NUM_NL80211_IFTYPES:
540 case NL80211_IFTYPE_P2P_CLIENT:
541 case NL80211_IFTYPE_P2P_GO:
542 /* cannot happen */
543 WARN_ON(1);
544 break;
545 }
546
547 if (local->open_count == 0) {
548 res = drv_start(local);
549 if (res)
550 goto err_del_bss;
551 /* we're brought up, everything changes */
552 hw_reconf_flags = ~0;
553 ieee80211_led_radio(local, true);
554 ieee80211_mod_tpt_led_trig(local,
555 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
556 }
557
558 /*
559 * Copy the hopefully now-present MAC address to
560 * this interface, if it has the special null one.
561 */
562 if (dev && is_zero_ether_addr(dev->dev_addr)) {
563 memcpy(dev->dev_addr,
564 local->hw.wiphy->perm_addr,
565 ETH_ALEN);
566 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
567
568 if (!is_valid_ether_addr(dev->dev_addr)) {
569 res = -EADDRNOTAVAIL;
570 goto err_stop;
571 }
572 }
573
574 switch (sdata->vif.type) {
575 case NL80211_IFTYPE_AP_VLAN:
576 /* no need to tell driver, but set carrier and chanctx */
577 if (rtnl_dereference(sdata->bss->beacon)) {
578 ieee80211_vif_vlan_copy_chanctx(sdata);
579 netif_carrier_on(dev);
580 } else {
581 netif_carrier_off(dev);
582 }
583 break;
584 case NL80211_IFTYPE_MONITOR:
585 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
586 local->cooked_mntrs++;
587 break;
588 }
589
590 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
591 res = drv_add_interface(local, sdata);
592 if (res)
593 goto err_stop;
594 } else if (local->monitors == 0 && local->open_count == 0) {
595 res = ieee80211_add_virtual_monitor(local);
596 if (res)
597 goto err_stop;
598 }
599
600 /* must be before the call to ieee80211_configure_filter */
601 local->monitors++;
602 if (local->monitors == 1) {
603 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
604 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
605 }
606
607 ieee80211_adjust_monitor_flags(sdata, 1);
608 ieee80211_configure_filter(local);
609 mutex_lock(&local->mtx);
610 ieee80211_recalc_idle(local);
611 mutex_unlock(&local->mtx);
612
613 netif_carrier_on(dev);
614 break;
615 default:
616 if (coming_up) {
617 ieee80211_del_virtual_monitor(local);
618
619 res = drv_add_interface(local, sdata);
620 if (res)
621 goto err_stop;
622 res = ieee80211_check_queues(sdata,
623 ieee80211_vif_type_p2p(&sdata->vif));
624 if (res)
625 goto err_del_interface;
626 }
627
628 if (sdata->vif.type == NL80211_IFTYPE_AP) {
629 local->fif_pspoll++;
630 local->fif_probe_req++;
631
632 ieee80211_configure_filter(local);
633 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
634 local->fif_probe_req++;
635 }
636
637 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
638 changed |= ieee80211_reset_erp_info(sdata);
639 ieee80211_bss_info_change_notify(sdata, changed);
640
641 switch (sdata->vif.type) {
642 case NL80211_IFTYPE_STATION:
643 case NL80211_IFTYPE_ADHOC:
644 case NL80211_IFTYPE_AP:
645 case NL80211_IFTYPE_MESH_POINT:
646 case NL80211_IFTYPE_OCB:
647 netif_carrier_off(dev);
648 break;
649 case NL80211_IFTYPE_WDS:
650 case NL80211_IFTYPE_P2P_DEVICE:
651 break;
652 default:
653 /* not reached */
654 WARN_ON(1);
655 }
656
657 /*
658 * set default queue parameters so drivers don't
659 * need to initialise the hardware if the hardware
660 * doesn't start up with sane defaults
661 */
662 ieee80211_set_wmm_default(sdata, true);
663 }
664
665 set_bit(SDATA_STATE_RUNNING, &sdata->state);
666
667 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
668 /* Create STA entry for the WDS peer */
669 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
670 GFP_KERNEL);
671 if (!sta) {
672 res = -ENOMEM;
673 goto err_del_interface;
674 }
675
676 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
677 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
678 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
679
680 res = sta_info_insert(sta);
681 if (res) {
682 /* STA has been freed */
683 goto err_del_interface;
684 }
685
686 rate_control_rate_init(sta);
687 netif_carrier_on(dev);
688 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
689 rcu_assign_pointer(local->p2p_sdata, sdata);
690 }
691
692 /*
693 * set_multicast_list will be invoked by the networking core
694 * which will check whether any increments here were done in
695 * error and sync them down to the hardware as filter flags.
696 */
697 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
698 atomic_inc(&local->iff_allmultis);
699
700 if (sdata->flags & IEEE80211_SDATA_PROMISC)
701 atomic_inc(&local->iff_promiscs);
702
703 if (coming_up)
704 local->open_count++;
705
706 if (hw_reconf_flags)
707 ieee80211_hw_config(local, hw_reconf_flags);
708
709 ieee80211_recalc_ps(local, -1);
710
711 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
712 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
713 /* XXX: for AP_VLAN, actually track AP queues */
714 netif_tx_start_all_queues(dev);
715 } else if (dev) {
716 unsigned long flags;
717 int n_acs = IEEE80211_NUM_ACS;
718 int ac;
719
720 if (local->hw.queues < IEEE80211_NUM_ACS)
721 n_acs = 1;
722
723 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
724 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
725 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
726 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
727 for (ac = 0; ac < n_acs; ac++) {
728 int ac_queue = sdata->vif.hw_queue[ac];
729
730 if (local->queue_stop_reasons[ac_queue] == 0 &&
731 skb_queue_empty(&local->pending[ac_queue]))
732 netif_start_subqueue(dev, ac);
733 }
734 }
735 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
736 }
737
738 return 0;
739 err_del_interface:
740 drv_remove_interface(local, sdata);
741 err_stop:
742 if (!local->open_count)
743 drv_stop(local);
744 err_del_bss:
745 sdata->bss = NULL;
746 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
747 mutex_lock(&local->mtx);
748 list_del(&sdata->u.vlan.list);
749 mutex_unlock(&local->mtx);
750 }
751 /* might already be clear but that doesn't matter */
752 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
753 return res;
754 }
755
756 static int ieee80211_open(struct net_device *dev)
757 {
758 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
759 int err;
760
761 /* fail early if user set an invalid address */
762 if (!is_valid_ether_addr(dev->dev_addr))
763 return -EADDRNOTAVAIL;
764
765 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
766 if (err)
767 return err;
768
769 return ieee80211_do_open(&sdata->wdev, true);
770 }
771
772 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
773 bool going_down)
774 {
775 struct ieee80211_local *local = sdata->local;
776 unsigned long flags;
777 struct sk_buff *skb, *tmp;
778 u32 hw_reconf_flags = 0;
779 int i, flushed;
780 struct ps_data *ps;
781 struct cfg80211_chan_def chandef;
782 bool cancel_scan;
783
784 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
785
786 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
787 if (cancel_scan)
788 ieee80211_scan_cancel(local);
789
790 /*
791 * Stop TX on this interface first.
792 */
793 if (sdata->dev)
794 netif_tx_stop_all_queues(sdata->dev);
795
796 ieee80211_roc_purge(local, sdata);
797
798 switch (sdata->vif.type) {
799 case NL80211_IFTYPE_STATION:
800 ieee80211_mgd_stop(sdata);
801 break;
802 case NL80211_IFTYPE_ADHOC:
803 ieee80211_ibss_stop(sdata);
804 break;
805 case NL80211_IFTYPE_AP:
806 cancel_work_sync(&sdata->u.ap.request_smps_work);
807 break;
808 default:
809 break;
810 }
811
812 /*
813 * Remove all stations associated with this interface.
814 *
815 * This must be done before calling ops->remove_interface()
816 * because otherwise we can later invoke ops->sta_notify()
817 * whenever the STAs are removed, and that invalidates driver
818 * assumptions about always getting a vif pointer that is valid
819 * (because if we remove a STA after ops->remove_interface()
820 * the driver will have removed the vif info already!)
821 *
822 * This is relevant only in WDS mode, in all other modes we've
823 * already removed all stations when disconnecting or similar,
824 * so warn otherwise.
825 */
826 flushed = sta_info_flush(sdata);
827 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
828 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
829
830 /* don't count this interface for promisc/allmulti while it is down */
831 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
832 atomic_dec(&local->iff_allmultis);
833
834 if (sdata->flags & IEEE80211_SDATA_PROMISC)
835 atomic_dec(&local->iff_promiscs);
836
837 if (sdata->vif.type == NL80211_IFTYPE_AP) {
838 local->fif_pspoll--;
839 local->fif_probe_req--;
840 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
841 local->fif_probe_req--;
842 }
843
844 if (sdata->dev) {
845 netif_addr_lock_bh(sdata->dev);
846 spin_lock_bh(&local->filter_lock);
847 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
848 sdata->dev->addr_len);
849 spin_unlock_bh(&local->filter_lock);
850 netif_addr_unlock_bh(sdata->dev);
851 }
852
853 del_timer_sync(&local->dynamic_ps_timer);
854 cancel_work_sync(&local->dynamic_ps_enable_work);
855
856 cancel_work_sync(&sdata->recalc_smps);
857 sdata_lock(sdata);
858 mutex_lock(&local->mtx);
859 sdata->vif.csa_active = false;
860 if (sdata->vif.type == NL80211_IFTYPE_STATION)
861 sdata->u.mgd.csa_waiting_bcn = false;
862 if (sdata->csa_block_tx) {
863 ieee80211_wake_vif_queues(local, sdata,
864 IEEE80211_QUEUE_STOP_REASON_CSA);
865 sdata->csa_block_tx = false;
866 }
867 mutex_unlock(&local->mtx);
868 sdata_unlock(sdata);
869
870 cancel_work_sync(&sdata->csa_finalize_work);
871
872 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
873
874 if (sdata->wdev.cac_started) {
875 chandef = sdata->vif.bss_conf.chandef;
876 WARN_ON(local->suspended);
877 mutex_lock(&local->mtx);
878 ieee80211_vif_release_channel(sdata);
879 mutex_unlock(&local->mtx);
880 cfg80211_cac_event(sdata->dev, &chandef,
881 NL80211_RADAR_CAC_ABORTED,
882 GFP_KERNEL);
883 }
884
885 /* APs need special treatment */
886 if (sdata->vif.type == NL80211_IFTYPE_AP) {
887 struct ieee80211_sub_if_data *vlan, *tmpsdata;
888
889 /* down all dependent devices, that is VLANs */
890 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
891 u.vlan.list)
892 dev_close(vlan->dev);
893 WARN_ON(!list_empty(&sdata->u.ap.vlans));
894 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
895 /* remove all packets in parent bc_buf pointing to this dev */
896 ps = &sdata->bss->ps;
897
898 spin_lock_irqsave(&ps->bc_buf.lock, flags);
899 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
900 if (skb->dev == sdata->dev) {
901 __skb_unlink(skb, &ps->bc_buf);
902 local->total_ps_buffered--;
903 ieee80211_free_txskb(&local->hw, skb);
904 }
905 }
906 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
907 }
908
909 if (going_down)
910 local->open_count--;
911
912 switch (sdata->vif.type) {
913 case NL80211_IFTYPE_AP_VLAN:
914 mutex_lock(&local->mtx);
915 list_del(&sdata->u.vlan.list);
916 mutex_unlock(&local->mtx);
917 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
918 /* see comment in the default case below */
919 ieee80211_free_keys(sdata, true);
920 /* no need to tell driver */
921 break;
922 case NL80211_IFTYPE_MONITOR:
923 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
924 local->cooked_mntrs--;
925 break;
926 }
927
928 local->monitors--;
929 if (local->monitors == 0) {
930 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
931 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
932 }
933
934 ieee80211_adjust_monitor_flags(sdata, -1);
935 break;
936 case NL80211_IFTYPE_P2P_DEVICE:
937 /* relies on synchronize_rcu() below */
938 RCU_INIT_POINTER(local->p2p_sdata, NULL);
939 /* fall through */
940 default:
941 cancel_work_sync(&sdata->work);
942 /*
943 * When we get here, the interface is marked down.
944 * Free the remaining keys, if there are any
945 * (which can happen in AP mode if userspace sets
946 * keys before the interface is operating, and maybe
947 * also in WDS mode)
948 *
949 * Force the key freeing to always synchronize_net()
950 * to wait for the RX path in case it is using this
951 * interface enqueuing frames at this very time on
952 * another CPU.
953 */
954 ieee80211_free_keys(sdata, true);
955 skb_queue_purge(&sdata->skb_queue);
956 }
957
958 sdata->bss = NULL;
959
960 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
961 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
962 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
963 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
964 if (info->control.vif == &sdata->vif) {
965 __skb_unlink(skb, &local->pending[i]);
966 ieee80211_free_txskb(&local->hw, skb);
967 }
968 }
969 }
970 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
971
972 if (local->open_count == 0)
973 ieee80211_clear_tx_pending(local);
974
975 /*
976 * If the interface goes down while suspended, presumably because
977 * the device was unplugged and that happens before our resume,
978 * then the driver is already unconfigured and the remainder of
979 * this function isn't needed.
980 * XXX: what about WoWLAN? If the device has software state, e.g.
981 * memory allocated, it might expect teardown commands from
982 * mac80211 here?
983 */
984 if (local->suspended) {
985 WARN_ON(local->wowlan);
986 WARN_ON(rtnl_dereference(local->monitor_sdata));
987 return;
988 }
989
990 switch (sdata->vif.type) {
991 case NL80211_IFTYPE_AP_VLAN:
992 break;
993 case NL80211_IFTYPE_MONITOR:
994 if (local->monitors == 0)
995 ieee80211_del_virtual_monitor(local);
996
997 mutex_lock(&local->mtx);
998 ieee80211_recalc_idle(local);
999 mutex_unlock(&local->mtx);
1000
1001 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1002 break;
1003
1004 /* fall through */
1005 default:
1006 if (going_down)
1007 drv_remove_interface(local, sdata);
1008 }
1009
1010 ieee80211_recalc_ps(local, -1);
1011
1012 if (cancel_scan)
1013 flush_delayed_work(&local->scan_work);
1014
1015 if (local->open_count == 0) {
1016 ieee80211_stop_device(local);
1017
1018 /* no reconfiguring after stop! */
1019 return;
1020 }
1021
1022 /* do after stop to avoid reconfiguring when we stop anyway */
1023 ieee80211_configure_filter(local);
1024 ieee80211_hw_config(local, hw_reconf_flags);
1025
1026 if (local->monitors == local->open_count)
1027 ieee80211_add_virtual_monitor(local);
1028 }
1029
1030 static int ieee80211_stop(struct net_device *dev)
1031 {
1032 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1033
1034 ieee80211_do_stop(sdata, true);
1035
1036 return 0;
1037 }
1038
1039 static void ieee80211_set_multicast_list(struct net_device *dev)
1040 {
1041 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1042 struct ieee80211_local *local = sdata->local;
1043 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1044
1045 allmulti = !!(dev->flags & IFF_ALLMULTI);
1046 promisc = !!(dev->flags & IFF_PROMISC);
1047 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1048 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1049
1050 if (allmulti != sdata_allmulti) {
1051 if (dev->flags & IFF_ALLMULTI)
1052 atomic_inc(&local->iff_allmultis);
1053 else
1054 atomic_dec(&local->iff_allmultis);
1055 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1056 }
1057
1058 if (promisc != sdata_promisc) {
1059 if (dev->flags & IFF_PROMISC)
1060 atomic_inc(&local->iff_promiscs);
1061 else
1062 atomic_dec(&local->iff_promiscs);
1063 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1064 }
1065 spin_lock_bh(&local->filter_lock);
1066 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1067 spin_unlock_bh(&local->filter_lock);
1068 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1069 }
1070
1071 /*
1072 * Called when the netdev is removed or, by the code below, before
1073 * the interface type changes.
1074 */
1075 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1076 {
1077 int i;
1078
1079 /* free extra data */
1080 ieee80211_free_keys(sdata, false);
1081
1082 ieee80211_debugfs_remove_netdev(sdata);
1083
1084 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1085 __skb_queue_purge(&sdata->fragments[i].skb_list);
1086 sdata->fragment_next = 0;
1087
1088 if (ieee80211_vif_is_mesh(&sdata->vif))
1089 mesh_rmc_free(sdata);
1090 }
1091
1092 static void ieee80211_uninit(struct net_device *dev)
1093 {
1094 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1095 }
1096
1097 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1098 struct sk_buff *skb,
1099 void *accel_priv,
1100 select_queue_fallback_t fallback)
1101 {
1102 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1103 }
1104
1105 static const struct net_device_ops ieee80211_dataif_ops = {
1106 .ndo_open = ieee80211_open,
1107 .ndo_stop = ieee80211_stop,
1108 .ndo_uninit = ieee80211_uninit,
1109 .ndo_start_xmit = ieee80211_subif_start_xmit,
1110 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1111 .ndo_change_mtu = ieee80211_change_mtu,
1112 .ndo_set_mac_address = ieee80211_change_mac,
1113 .ndo_select_queue = ieee80211_netdev_select_queue,
1114 };
1115
1116 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1117 struct sk_buff *skb,
1118 void *accel_priv,
1119 select_queue_fallback_t fallback)
1120 {
1121 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1122 struct ieee80211_local *local = sdata->local;
1123 struct ieee80211_hdr *hdr;
1124 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1125
1126 if (local->hw.queues < IEEE80211_NUM_ACS)
1127 return 0;
1128
1129 if (skb->len < 4 ||
1130 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1131 return 0; /* doesn't matter, frame will be dropped */
1132
1133 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1134
1135 return ieee80211_select_queue_80211(sdata, skb, hdr);
1136 }
1137
1138 static const struct net_device_ops ieee80211_monitorif_ops = {
1139 .ndo_open = ieee80211_open,
1140 .ndo_stop = ieee80211_stop,
1141 .ndo_uninit = ieee80211_uninit,
1142 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1143 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1144 .ndo_change_mtu = ieee80211_change_mtu,
1145 .ndo_set_mac_address = ieee80211_change_mac,
1146 .ndo_select_queue = ieee80211_monitor_select_queue,
1147 };
1148
1149 static void ieee80211_if_setup(struct net_device *dev)
1150 {
1151 ether_setup(dev);
1152 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1153 dev->netdev_ops = &ieee80211_dataif_ops;
1154 dev->destructor = free_netdev;
1155 }
1156
1157 static void ieee80211_iface_work(struct work_struct *work)
1158 {
1159 struct ieee80211_sub_if_data *sdata =
1160 container_of(work, struct ieee80211_sub_if_data, work);
1161 struct ieee80211_local *local = sdata->local;
1162 struct sk_buff *skb;
1163 struct sta_info *sta;
1164 struct ieee80211_ra_tid *ra_tid;
1165 struct ieee80211_rx_agg *rx_agg;
1166
1167 if (!ieee80211_sdata_running(sdata))
1168 return;
1169
1170 if (local->scanning)
1171 return;
1172
1173 if (!ieee80211_can_run_worker(local))
1174 return;
1175
1176 /* first process frames */
1177 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1178 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1179
1180 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1181 ra_tid = (void *)&skb->cb;
1182 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1183 ra_tid->tid);
1184 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1185 ra_tid = (void *)&skb->cb;
1186 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1187 ra_tid->tid);
1188 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1189 rx_agg = (void *)&skb->cb;
1190 mutex_lock(&local->sta_mtx);
1191 sta = sta_info_get_bss(sdata, rx_agg->addr);
1192 if (sta)
1193 __ieee80211_start_rx_ba_session(sta,
1194 0, 0, 0, 1, rx_agg->tid,
1195 IEEE80211_MAX_AMPDU_BUF,
1196 false, true);
1197 mutex_unlock(&local->sta_mtx);
1198 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1199 rx_agg = (void *)&skb->cb;
1200 mutex_lock(&local->sta_mtx);
1201 sta = sta_info_get_bss(sdata, rx_agg->addr);
1202 if (sta)
1203 __ieee80211_stop_rx_ba_session(sta,
1204 rx_agg->tid,
1205 WLAN_BACK_RECIPIENT, 0,
1206 false);
1207 mutex_unlock(&local->sta_mtx);
1208 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1209 ieee80211_process_tdls_channel_switch(sdata, skb);
1210 } else if (ieee80211_is_action(mgmt->frame_control) &&
1211 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1212 int len = skb->len;
1213
1214 mutex_lock(&local->sta_mtx);
1215 sta = sta_info_get_bss(sdata, mgmt->sa);
1216 if (sta) {
1217 switch (mgmt->u.action.u.addba_req.action_code) {
1218 case WLAN_ACTION_ADDBA_REQ:
1219 ieee80211_process_addba_request(
1220 local, sta, mgmt, len);
1221 break;
1222 case WLAN_ACTION_ADDBA_RESP:
1223 ieee80211_process_addba_resp(local, sta,
1224 mgmt, len);
1225 break;
1226 case WLAN_ACTION_DELBA:
1227 ieee80211_process_delba(sdata, sta,
1228 mgmt, len);
1229 break;
1230 default:
1231 WARN_ON(1);
1232 break;
1233 }
1234 }
1235 mutex_unlock(&local->sta_mtx);
1236 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1237 struct ieee80211_hdr *hdr = (void *)mgmt;
1238 /*
1239 * So the frame isn't mgmt, but frame_control
1240 * is at the right place anyway, of course, so
1241 * the if statement is correct.
1242 *
1243 * Warn if we have other data frame types here,
1244 * they must not get here.
1245 */
1246 WARN_ON(hdr->frame_control &
1247 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1248 WARN_ON(!(hdr->seq_ctrl &
1249 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1250 /*
1251 * This was a fragment of a frame, received while
1252 * a block-ack session was active. That cannot be
1253 * right, so terminate the session.
1254 */
1255 mutex_lock(&local->sta_mtx);
1256 sta = sta_info_get_bss(sdata, mgmt->sa);
1257 if (sta) {
1258 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1259 IEEE80211_QOS_CTL_TID_MASK;
1260
1261 __ieee80211_stop_rx_ba_session(
1262 sta, tid, WLAN_BACK_RECIPIENT,
1263 WLAN_REASON_QSTA_REQUIRE_SETUP,
1264 true);
1265 }
1266 mutex_unlock(&local->sta_mtx);
1267 } else switch (sdata->vif.type) {
1268 case NL80211_IFTYPE_STATION:
1269 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1270 break;
1271 case NL80211_IFTYPE_ADHOC:
1272 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1273 break;
1274 case NL80211_IFTYPE_MESH_POINT:
1275 if (!ieee80211_vif_is_mesh(&sdata->vif))
1276 break;
1277 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1278 break;
1279 default:
1280 WARN(1, "frame for unexpected interface type");
1281 break;
1282 }
1283
1284 kfree_skb(skb);
1285 }
1286
1287 /* then other type-dependent work */
1288 switch (sdata->vif.type) {
1289 case NL80211_IFTYPE_STATION:
1290 ieee80211_sta_work(sdata);
1291 break;
1292 case NL80211_IFTYPE_ADHOC:
1293 ieee80211_ibss_work(sdata);
1294 break;
1295 case NL80211_IFTYPE_MESH_POINT:
1296 if (!ieee80211_vif_is_mesh(&sdata->vif))
1297 break;
1298 ieee80211_mesh_work(sdata);
1299 break;
1300 case NL80211_IFTYPE_OCB:
1301 ieee80211_ocb_work(sdata);
1302 break;
1303 default:
1304 break;
1305 }
1306 }
1307
1308 static void ieee80211_recalc_smps_work(struct work_struct *work)
1309 {
1310 struct ieee80211_sub_if_data *sdata =
1311 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1312
1313 ieee80211_recalc_smps(sdata);
1314 }
1315
1316 /*
1317 * Helper function to initialise an interface to a specific type.
1318 */
1319 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1320 enum nl80211_iftype type)
1321 {
1322 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1323 0xff, 0xff, 0xff};
1324
1325 /* clear type-dependent union */
1326 memset(&sdata->u, 0, sizeof(sdata->u));
1327
1328 /* and set some type-dependent values */
1329 sdata->vif.type = type;
1330 sdata->vif.p2p = false;
1331 sdata->wdev.iftype = type;
1332
1333 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1334 sdata->control_port_no_encrypt = false;
1335 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1336 sdata->vif.bss_conf.idle = true;
1337
1338 sdata->noack_map = 0;
1339
1340 /* only monitor/p2p-device differ */
1341 if (sdata->dev) {
1342 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1343 sdata->dev->type = ARPHRD_ETHER;
1344 }
1345
1346 skb_queue_head_init(&sdata->skb_queue);
1347 INIT_WORK(&sdata->work, ieee80211_iface_work);
1348 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1349 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1350 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1351 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1352
1353 switch (type) {
1354 case NL80211_IFTYPE_P2P_GO:
1355 type = NL80211_IFTYPE_AP;
1356 sdata->vif.type = type;
1357 sdata->vif.p2p = true;
1358 /* fall through */
1359 case NL80211_IFTYPE_AP:
1360 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1361 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1362 INIT_WORK(&sdata->u.ap.request_smps_work,
1363 ieee80211_request_smps_ap_work);
1364 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1365 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1366 break;
1367 case NL80211_IFTYPE_P2P_CLIENT:
1368 type = NL80211_IFTYPE_STATION;
1369 sdata->vif.type = type;
1370 sdata->vif.p2p = true;
1371 /* fall through */
1372 case NL80211_IFTYPE_STATION:
1373 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1374 ieee80211_sta_setup_sdata(sdata);
1375 break;
1376 case NL80211_IFTYPE_OCB:
1377 sdata->vif.bss_conf.bssid = bssid_wildcard;
1378 ieee80211_ocb_setup_sdata(sdata);
1379 break;
1380 case NL80211_IFTYPE_ADHOC:
1381 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1382 ieee80211_ibss_setup_sdata(sdata);
1383 break;
1384 case NL80211_IFTYPE_MESH_POINT:
1385 if (ieee80211_vif_is_mesh(&sdata->vif))
1386 ieee80211_mesh_init_sdata(sdata);
1387 break;
1388 case NL80211_IFTYPE_MONITOR:
1389 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1390 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1391 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1392 MONITOR_FLAG_OTHER_BSS;
1393 break;
1394 case NL80211_IFTYPE_WDS:
1395 sdata->vif.bss_conf.bssid = NULL;
1396 break;
1397 case NL80211_IFTYPE_AP_VLAN:
1398 case NL80211_IFTYPE_P2P_DEVICE:
1399 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1400 break;
1401 case NL80211_IFTYPE_UNSPECIFIED:
1402 case NUM_NL80211_IFTYPES:
1403 BUG();
1404 break;
1405 }
1406
1407 ieee80211_debugfs_add_netdev(sdata);
1408 }
1409
1410 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1411 enum nl80211_iftype type)
1412 {
1413 struct ieee80211_local *local = sdata->local;
1414 int ret, err;
1415 enum nl80211_iftype internal_type = type;
1416 bool p2p = false;
1417
1418 ASSERT_RTNL();
1419
1420 if (!local->ops->change_interface)
1421 return -EBUSY;
1422
1423 switch (sdata->vif.type) {
1424 case NL80211_IFTYPE_AP:
1425 case NL80211_IFTYPE_STATION:
1426 case NL80211_IFTYPE_ADHOC:
1427 case NL80211_IFTYPE_OCB:
1428 /*
1429 * Could maybe also all others here?
1430 * Just not sure how that interacts
1431 * with the RX/config path e.g. for
1432 * mesh.
1433 */
1434 break;
1435 default:
1436 return -EBUSY;
1437 }
1438
1439 switch (type) {
1440 case NL80211_IFTYPE_AP:
1441 case NL80211_IFTYPE_STATION:
1442 case NL80211_IFTYPE_ADHOC:
1443 case NL80211_IFTYPE_OCB:
1444 /*
1445 * Could probably support everything
1446 * but WDS here (WDS do_open can fail
1447 * under memory pressure, which this
1448 * code isn't prepared to handle).
1449 */
1450 break;
1451 case NL80211_IFTYPE_P2P_CLIENT:
1452 p2p = true;
1453 internal_type = NL80211_IFTYPE_STATION;
1454 break;
1455 case NL80211_IFTYPE_P2P_GO:
1456 p2p = true;
1457 internal_type = NL80211_IFTYPE_AP;
1458 break;
1459 default:
1460 return -EBUSY;
1461 }
1462
1463 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1464 if (ret)
1465 return ret;
1466
1467 ieee80211_do_stop(sdata, false);
1468
1469 ieee80211_teardown_sdata(sdata);
1470
1471 ret = drv_change_interface(local, sdata, internal_type, p2p);
1472 if (ret)
1473 type = ieee80211_vif_type_p2p(&sdata->vif);
1474
1475 /*
1476 * Ignore return value here, there's not much we can do since
1477 * the driver changed the interface type internally already.
1478 * The warnings will hopefully make driver authors fix it :-)
1479 */
1480 ieee80211_check_queues(sdata, type);
1481
1482 ieee80211_setup_sdata(sdata, type);
1483
1484 err = ieee80211_do_open(&sdata->wdev, false);
1485 WARN(err, "type change: do_open returned %d", err);
1486
1487 return ret;
1488 }
1489
1490 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1491 enum nl80211_iftype type)
1492 {
1493 int ret;
1494
1495 ASSERT_RTNL();
1496
1497 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1498 return 0;
1499
1500 if (ieee80211_sdata_running(sdata)) {
1501 ret = ieee80211_runtime_change_iftype(sdata, type);
1502 if (ret)
1503 return ret;
1504 } else {
1505 /* Purge and reset type-dependent state. */
1506 ieee80211_teardown_sdata(sdata);
1507 ieee80211_setup_sdata(sdata, type);
1508 }
1509
1510 /* reset some values that shouldn't be kept across type changes */
1511 sdata->drop_unencrypted = 0;
1512 if (type == NL80211_IFTYPE_STATION)
1513 sdata->u.mgd.use_4addr = false;
1514
1515 return 0;
1516 }
1517
1518 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1519 u8 *perm_addr, enum nl80211_iftype type)
1520 {
1521 struct ieee80211_sub_if_data *sdata;
1522 u64 mask, start, addr, val, inc;
1523 u8 *m;
1524 u8 tmp_addr[ETH_ALEN];
1525 int i;
1526
1527 /* default ... something at least */
1528 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1529
1530 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1531 local->hw.wiphy->n_addresses <= 1)
1532 return;
1533
1534 mutex_lock(&local->iflist_mtx);
1535
1536 switch (type) {
1537 case NL80211_IFTYPE_MONITOR:
1538 /* doesn't matter */
1539 break;
1540 case NL80211_IFTYPE_WDS:
1541 case NL80211_IFTYPE_AP_VLAN:
1542 /* match up with an AP interface */
1543 list_for_each_entry(sdata, &local->interfaces, list) {
1544 if (sdata->vif.type != NL80211_IFTYPE_AP)
1545 continue;
1546 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1547 break;
1548 }
1549 /* keep default if no AP interface present */
1550 break;
1551 case NL80211_IFTYPE_P2P_CLIENT:
1552 case NL80211_IFTYPE_P2P_GO:
1553 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1554 list_for_each_entry(sdata, &local->interfaces, list) {
1555 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1556 continue;
1557 if (!ieee80211_sdata_running(sdata))
1558 continue;
1559 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1560 goto out_unlock;
1561 }
1562 }
1563 /* otherwise fall through */
1564 default:
1565 /* assign a new address if possible -- try n_addresses first */
1566 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1567 bool used = false;
1568
1569 list_for_each_entry(sdata, &local->interfaces, list) {
1570 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1571 sdata->vif.addr)) {
1572 used = true;
1573 break;
1574 }
1575 }
1576
1577 if (!used) {
1578 memcpy(perm_addr,
1579 local->hw.wiphy->addresses[i].addr,
1580 ETH_ALEN);
1581 break;
1582 }
1583 }
1584
1585 /* try mask if available */
1586 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1587 break;
1588
1589 m = local->hw.wiphy->addr_mask;
1590 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1591 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1592 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1593
1594 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1595 /* not a contiguous mask ... not handled now! */
1596 pr_info("not contiguous\n");
1597 break;
1598 }
1599
1600 /*
1601 * Pick address of existing interface in case user changed
1602 * MAC address manually, default to perm_addr.
1603 */
1604 m = local->hw.wiphy->perm_addr;
1605 list_for_each_entry(sdata, &local->interfaces, list) {
1606 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1607 continue;
1608 m = sdata->vif.addr;
1609 break;
1610 }
1611 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1612 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1613 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1614
1615 inc = 1ULL<<__ffs64(mask);
1616 val = (start & mask);
1617 addr = (start & ~mask) | (val & mask);
1618 do {
1619 bool used = false;
1620
1621 tmp_addr[5] = addr >> 0*8;
1622 tmp_addr[4] = addr >> 1*8;
1623 tmp_addr[3] = addr >> 2*8;
1624 tmp_addr[2] = addr >> 3*8;
1625 tmp_addr[1] = addr >> 4*8;
1626 tmp_addr[0] = addr >> 5*8;
1627
1628 val += inc;
1629
1630 list_for_each_entry(sdata, &local->interfaces, list) {
1631 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1632 used = true;
1633 break;
1634 }
1635 }
1636
1637 if (!used) {
1638 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1639 break;
1640 }
1641 addr = (start & ~mask) | (val & mask);
1642 } while (addr != start);
1643
1644 break;
1645 }
1646
1647 out_unlock:
1648 mutex_unlock(&local->iflist_mtx);
1649 }
1650
1651 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1652 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1653 struct vif_params *params)
1654 {
1655 struct net_device *ndev = NULL;
1656 struct ieee80211_sub_if_data *sdata = NULL;
1657 int ret, i;
1658 int txqs = 1;
1659
1660 ASSERT_RTNL();
1661
1662 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1663 struct wireless_dev *wdev;
1664
1665 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1666 GFP_KERNEL);
1667 if (!sdata)
1668 return -ENOMEM;
1669 wdev = &sdata->wdev;
1670
1671 sdata->dev = NULL;
1672 strlcpy(sdata->name, name, IFNAMSIZ);
1673 ieee80211_assign_perm_addr(local, wdev->address, type);
1674 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1675 } else {
1676 if (local->hw.queues >= IEEE80211_NUM_ACS)
1677 txqs = IEEE80211_NUM_ACS;
1678
1679 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1680 name, NET_NAME_UNKNOWN,
1681 ieee80211_if_setup, txqs, 1);
1682 if (!ndev)
1683 return -ENOMEM;
1684 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1685
1686 ndev->needed_headroom = local->tx_headroom +
1687 4*6 /* four MAC addresses */
1688 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1689 + 6 /* mesh */
1690 + 8 /* rfc1042/bridge tunnel */
1691 - ETH_HLEN /* ethernet hard_header_len */
1692 + IEEE80211_ENCRYPT_HEADROOM;
1693 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1694
1695 ret = dev_alloc_name(ndev, ndev->name);
1696 if (ret < 0) {
1697 free_netdev(ndev);
1698 return ret;
1699 }
1700
1701 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1702 if (params && is_valid_ether_addr(params->macaddr))
1703 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1704 else
1705 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1706 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1707
1708 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1709 sdata = netdev_priv(ndev);
1710 ndev->ieee80211_ptr = &sdata->wdev;
1711 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1712 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1713
1714 sdata->dev = ndev;
1715 }
1716
1717 /* initialise type-independent data */
1718 sdata->wdev.wiphy = local->hw.wiphy;
1719 sdata->local = local;
1720
1721 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1722 skb_queue_head_init(&sdata->fragments[i].skb_list);
1723
1724 INIT_LIST_HEAD(&sdata->key_list);
1725
1726 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1727 ieee80211_dfs_cac_timer_work);
1728 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1729 ieee80211_delayed_tailroom_dec);
1730
1731 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1732 struct ieee80211_supported_band *sband;
1733 sband = local->hw.wiphy->bands[i];
1734 sdata->rc_rateidx_mask[i] =
1735 sband ? (1 << sband->n_bitrates) - 1 : 0;
1736 if (sband)
1737 memcpy(sdata->rc_rateidx_mcs_mask[i],
1738 sband->ht_cap.mcs.rx_mask,
1739 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1740 else
1741 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1742 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1743 }
1744
1745 ieee80211_set_default_queues(sdata);
1746
1747 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1748 sdata->user_power_level = local->user_power_level;
1749
1750 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1751
1752 /* setup type-dependent data */
1753 ieee80211_setup_sdata(sdata, type);
1754
1755 if (ndev) {
1756 if (params) {
1757 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1758 if (type == NL80211_IFTYPE_STATION)
1759 sdata->u.mgd.use_4addr = params->use_4addr;
1760 }
1761
1762 ndev->features |= local->hw.netdev_features;
1763
1764 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1765
1766 ret = register_netdevice(ndev);
1767 if (ret) {
1768 free_netdev(ndev);
1769 return ret;
1770 }
1771 }
1772
1773 mutex_lock(&local->iflist_mtx);
1774 list_add_tail_rcu(&sdata->list, &local->interfaces);
1775 mutex_unlock(&local->iflist_mtx);
1776
1777 if (new_wdev)
1778 *new_wdev = &sdata->wdev;
1779
1780 return 0;
1781 }
1782
1783 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1784 {
1785 ASSERT_RTNL();
1786
1787 mutex_lock(&sdata->local->iflist_mtx);
1788 list_del_rcu(&sdata->list);
1789 mutex_unlock(&sdata->local->iflist_mtx);
1790
1791 synchronize_rcu();
1792
1793 if (sdata->dev) {
1794 unregister_netdevice(sdata->dev);
1795 } else {
1796 cfg80211_unregister_wdev(&sdata->wdev);
1797 kfree(sdata);
1798 }
1799 }
1800
1801 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1802 {
1803 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1804 return;
1805 ieee80211_do_stop(sdata, true);
1806 ieee80211_teardown_sdata(sdata);
1807 }
1808
1809 /*
1810 * Remove all interfaces, may only be called at hardware unregistration
1811 * time because it doesn't do RCU-safe list removals.
1812 */
1813 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1814 {
1815 struct ieee80211_sub_if_data *sdata, *tmp;
1816 LIST_HEAD(unreg_list);
1817 LIST_HEAD(wdev_list);
1818
1819 ASSERT_RTNL();
1820
1821 /*
1822 * Close all AP_VLAN interfaces first, as otherwise they
1823 * might be closed while the AP interface they belong to
1824 * is closed, causing unregister_netdevice_many() to crash.
1825 */
1826 list_for_each_entry(sdata, &local->interfaces, list)
1827 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1828 dev_close(sdata->dev);
1829
1830 mutex_lock(&local->iflist_mtx);
1831 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1832 list_del(&sdata->list);
1833
1834 if (sdata->dev)
1835 unregister_netdevice_queue(sdata->dev, &unreg_list);
1836 else
1837 list_add(&sdata->list, &wdev_list);
1838 }
1839 mutex_unlock(&local->iflist_mtx);
1840 unregister_netdevice_many(&unreg_list);
1841
1842 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1843 list_del(&sdata->list);
1844 cfg80211_unregister_wdev(&sdata->wdev);
1845 kfree(sdata);
1846 }
1847 }
1848
1849 static int netdev_notify(struct notifier_block *nb,
1850 unsigned long state, void *ptr)
1851 {
1852 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1853 struct ieee80211_sub_if_data *sdata;
1854
1855 if (state != NETDEV_CHANGENAME)
1856 return NOTIFY_DONE;
1857
1858 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1859 return NOTIFY_DONE;
1860
1861 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1862 return NOTIFY_DONE;
1863
1864 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1865 memcpy(sdata->name, dev->name, IFNAMSIZ);
1866 ieee80211_debugfs_rename_netdev(sdata);
1867
1868 return NOTIFY_OK;
1869 }
1870
1871 static struct notifier_block mac80211_netdev_notifier = {
1872 .notifier_call = netdev_notify,
1873 };
1874
1875 int ieee80211_iface_init(void)
1876 {
1877 return register_netdevice_notifier(&mac80211_netdev_notifier);
1878 }
1879
1880 void ieee80211_iface_exit(void)
1881 {
1882 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1883 }
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