?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'gpio-for-v3.11-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / net / mac80211 / iface.c
blobcc117591f678463c2cd9a3eb4060af5e01bf51ca
1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 int power;
49
50 rcu_read_lock();
51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 if (!chanctx_conf) {
53 rcu_read_unlock();
54 return false;
55 }
56
57 power = chanctx_conf->def.chan->max_power;
58 rcu_read_unlock();
59
60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 power = min(power, sdata->user_power_level);
62
63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->ap_power_level);
65
66 if (power != sdata->vif.bss_conf.txpower) {
67 sdata->vif.bss_conf.txpower = power;
68 ieee80211_hw_config(sdata->local, 0);
69 return true;
70 }
71
72 return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 if (__ieee80211_recalc_txpower(sdata))
78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
82 {
83 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84 return 0;
85
86 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87 return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
91 {
92 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93 return 0;
94
95 ieee80211_flush_queues(local, NULL);
96
97 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102 bool force_active)
103 {
104 bool working = false, scanning, active;
105 unsigned int led_trig_start = 0, led_trig_stop = 0;
106 struct ieee80211_roc_work *roc;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = force_active ||
111 !list_empty(&local->chanctx_list) ||
112 local->monitors;
113
114 if (!local->ops->remain_on_channel) {
115 list_for_each_entry(roc, &local->roc_list, list) {
116 working = true;
117 break;
118 }
119 }
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156 return -EINVAL;
157
158 dev->mtu = new_mtu;
159 return 0;
160 }
161
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
163 bool check_dup)
164 {
165 struct ieee80211_local *local = sdata->local;
166 struct ieee80211_sub_if_data *iter;
167 u64 new, mask, tmp;
168 u8 *m;
169 int ret = 0;
170
171 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172 return 0;
173
174 m = addr;
175 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178
179 m = local->hw.wiphy->addr_mask;
180 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183
184 if (!check_dup)
185 return ret;
186
187 mutex_lock(&local->iflist_mtx);
188 list_for_each_entry(iter, &local->interfaces, list) {
189 if (iter == sdata)
190 continue;
191
192 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
194 continue;
195
196 m = iter->vif.addr;
197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200
201 if ((new & ~mask) != (tmp & ~mask)) {
202 ret = -EINVAL;
203 break;
204 }
205 }
206 mutex_unlock(&local->iflist_mtx);
207
208 return ret;
209 }
210
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214 struct sockaddr *sa = addr;
215 bool check_dup = true;
216 int ret;
217
218 if (ieee80211_sdata_running(sdata))
219 return -EBUSY;
220
221 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
223 check_dup = false;
224
225 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226 if (ret)
227 return ret;
228
229 ret = eth_mac_addr(dev, sa);
230
231 if (ret == 0)
232 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233
234 return ret;
235 }
236
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239 return type1 == NL80211_IFTYPE_MONITOR ||
240 type2 == NL80211_IFTYPE_MONITOR ||
241 type1 == NL80211_IFTYPE_P2P_DEVICE ||
242 type2 == NL80211_IFTYPE_P2P_DEVICE ||
243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244 (type1 == NL80211_IFTYPE_WDS &&
245 (type2 == NL80211_IFTYPE_WDS ||
246 type2 == NL80211_IFTYPE_AP)) ||
247 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248 (type1 == NL80211_IFTYPE_AP_VLAN &&
249 (type2 == NL80211_IFTYPE_AP ||
250 type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254 enum nl80211_iftype iftype)
255 {
256 struct ieee80211_local *local = sdata->local;
257 struct ieee80211_sub_if_data *nsdata;
258
259 ASSERT_RTNL();
260
261 /* we hold the RTNL here so can safely walk the list */
262 list_for_each_entry(nsdata, &local->interfaces, list) {
263 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
264 /*
265 * Allow only a single IBSS interface to be up at any
266 * time. This is restricted because beacon distribution
267 * cannot work properly if both are in the same IBSS.
268 *
269 * To remove this restriction we'd have to disallow them
270 * from setting the same SSID on different IBSS interfaces
271 * belonging to the same hardware. Then, however, we're
272 * faced with having to adopt two different TSF timers...
273 */
274 if (iftype == NL80211_IFTYPE_ADHOC &&
275 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276 return -EBUSY;
277
278 /*
279 * The remaining checks are only performed for interfaces
280 * with the same MAC address.
281 */
282 if (!ether_addr_equal(sdata->vif.addr,
283 nsdata->vif.addr))
284 continue;
285
286 /*
287 * check whether it may have the same address
288 */
289 if (!identical_mac_addr_allowed(iftype,
290 nsdata->vif.type))
291 return -ENOTUNIQ;
292
293 /*
294 * can only add VLANs to enabled APs
295 */
296 if (iftype == NL80211_IFTYPE_AP_VLAN &&
297 nsdata->vif.type == NL80211_IFTYPE_AP)
298 sdata->bss = &nsdata->u.ap;
299 }
300 }
301
302 return 0;
303 }
304
305 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
306 {
307 int n_queues = sdata->local->hw.queues;
308 int i;
309
310 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
311 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
312 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
313 IEEE80211_INVAL_HW_QUEUE))
314 return -EINVAL;
315 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
316 n_queues))
317 return -EINVAL;
318 }
319 }
320
321 if ((sdata->vif.type != NL80211_IFTYPE_AP &&
322 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
323 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
324 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
325 return 0;
326 }
327
328 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
329 return -EINVAL;
330
331 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
332 return -EINVAL;
333
334 return 0;
335 }
336
337 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
338 const int offset)
339 {
340 struct ieee80211_local *local = sdata->local;
341 u32 flags = sdata->u.mntr_flags;
342
343 #define ADJUST(_f, _s) do { \
344 if (flags & MONITOR_FLAG_##_f) \
345 local->fif_##_s += offset; \
346 } while (0)
347
348 ADJUST(FCSFAIL, fcsfail);
349 ADJUST(PLCPFAIL, plcpfail);
350 ADJUST(CONTROL, control);
351 ADJUST(CONTROL, pspoll);
352 ADJUST(OTHER_BSS, other_bss);
353
354 #undef ADJUST
355 }
356
357 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
358 {
359 struct ieee80211_local *local = sdata->local;
360 int i;
361
362 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
363 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
364 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
365 else if (local->hw.queues >= IEEE80211_NUM_ACS)
366 sdata->vif.hw_queue[i] = i;
367 else
368 sdata->vif.hw_queue[i] = 0;
369 }
370 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
371 }
372
373 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
374 {
375 struct ieee80211_sub_if_data *sdata;
376 int ret;
377
378 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
379 return 0;
380
381 ASSERT_RTNL();
382
383 if (local->monitor_sdata)
384 return 0;
385
386 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
387 if (!sdata)
388 return -ENOMEM;
389
390 /* set up data */
391 sdata->local = local;
392 sdata->vif.type = NL80211_IFTYPE_MONITOR;
393 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
394 wiphy_name(local->hw.wiphy));
395
396 ieee80211_set_default_queues(sdata);
397
398 ret = drv_add_interface(local, sdata);
399 if (WARN_ON(ret)) {
400 /* ok .. stupid driver, it asked for this! */
401 kfree(sdata);
402 return ret;
403 }
404
405 ret = ieee80211_check_queues(sdata);
406 if (ret) {
407 kfree(sdata);
408 return ret;
409 }
410
411 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
412 IEEE80211_CHANCTX_EXCLUSIVE);
413 if (ret) {
414 drv_remove_interface(local, sdata);
415 kfree(sdata);
416 return ret;
417 }
418
419 mutex_lock(&local->iflist_mtx);
420 rcu_assign_pointer(local->monitor_sdata, sdata);
421 mutex_unlock(&local->iflist_mtx);
422
423 return 0;
424 }
425
426 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
427 {
428 struct ieee80211_sub_if_data *sdata;
429
430 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
431 return;
432
433 ASSERT_RTNL();
434
435 mutex_lock(&local->iflist_mtx);
436
437 sdata = rcu_dereference_protected(local->monitor_sdata,
438 lockdep_is_held(&local->iflist_mtx));
439 if (!sdata) {
440 mutex_unlock(&local->iflist_mtx);
441 return;
442 }
443
444 rcu_assign_pointer(local->monitor_sdata, NULL);
445 mutex_unlock(&local->iflist_mtx);
446
447 synchronize_net();
448
449 ieee80211_vif_release_channel(sdata);
450
451 drv_remove_interface(local, sdata);
452
453 kfree(sdata);
454 }
455
456 /*
457 * NOTE: Be very careful when changing this function, it must NOT return
458 * an error on interface type changes that have been pre-checked, so most
459 * checks should be in ieee80211_check_concurrent_iface.
460 */
461 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
462 {
463 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
464 struct net_device *dev = wdev->netdev;
465 struct ieee80211_local *local = sdata->local;
466 struct sta_info *sta;
467 u32 changed = 0;
468 int res;
469 u32 hw_reconf_flags = 0;
470
471 switch (sdata->vif.type) {
472 case NL80211_IFTYPE_WDS:
473 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
474 return -ENOLINK;
475 break;
476 case NL80211_IFTYPE_AP_VLAN: {
477 struct ieee80211_sub_if_data *master;
478
479 if (!sdata->bss)
480 return -ENOLINK;
481
482 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
483
484 master = container_of(sdata->bss,
485 struct ieee80211_sub_if_data, u.ap);
486 sdata->control_port_protocol =
487 master->control_port_protocol;
488 sdata->control_port_no_encrypt =
489 master->control_port_no_encrypt;
490 sdata->vif.cab_queue = master->vif.cab_queue;
491 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
492 sizeof(sdata->vif.hw_queue));
493 break;
494 }
495 case NL80211_IFTYPE_AP:
496 sdata->bss = &sdata->u.ap;
497 break;
498 case NL80211_IFTYPE_MESH_POINT:
499 case NL80211_IFTYPE_STATION:
500 case NL80211_IFTYPE_MONITOR:
501 case NL80211_IFTYPE_ADHOC:
502 case NL80211_IFTYPE_P2P_DEVICE:
503 /* no special treatment */
504 break;
505 case NL80211_IFTYPE_UNSPECIFIED:
506 case NUM_NL80211_IFTYPES:
507 case NL80211_IFTYPE_P2P_CLIENT:
508 case NL80211_IFTYPE_P2P_GO:
509 /* cannot happen */
510 WARN_ON(1);
511 break;
512 }
513
514 if (local->open_count == 0) {
515 res = drv_start(local);
516 if (res)
517 goto err_del_bss;
518 /* we're brought up, everything changes */
519 hw_reconf_flags = ~0;
520 ieee80211_led_radio(local, true);
521 ieee80211_mod_tpt_led_trig(local,
522 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
523 }
524
525 /*
526 * Copy the hopefully now-present MAC address to
527 * this interface, if it has the special null one.
528 */
529 if (dev && is_zero_ether_addr(dev->dev_addr)) {
530 memcpy(dev->dev_addr,
531 local->hw.wiphy->perm_addr,
532 ETH_ALEN);
533 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
534
535 if (!is_valid_ether_addr(dev->dev_addr)) {
536 res = -EADDRNOTAVAIL;
537 goto err_stop;
538 }
539 }
540
541 switch (sdata->vif.type) {
542 case NL80211_IFTYPE_AP_VLAN:
543 /* no need to tell driver, but set carrier and chanctx */
544 if (rtnl_dereference(sdata->bss->beacon)) {
545 ieee80211_vif_vlan_copy_chanctx(sdata);
546 netif_carrier_on(dev);
547 } else {
548 netif_carrier_off(dev);
549 }
550 break;
551 case NL80211_IFTYPE_MONITOR:
552 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
553 local->cooked_mntrs++;
554 break;
555 }
556
557 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
558 res = drv_add_interface(local, sdata);
559 if (res)
560 goto err_stop;
561 } else if (local->monitors == 0 && local->open_count == 0) {
562 res = ieee80211_add_virtual_monitor(local);
563 if (res)
564 goto err_stop;
565 }
566
567 /* must be before the call to ieee80211_configure_filter */
568 local->monitors++;
569 if (local->monitors == 1) {
570 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
571 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
572 }
573
574 ieee80211_adjust_monitor_flags(sdata, 1);
575 ieee80211_configure_filter(local);
576 mutex_lock(&local->mtx);
577 ieee80211_recalc_idle(local);
578 mutex_unlock(&local->mtx);
579
580 netif_carrier_on(dev);
581 break;
582 default:
583 if (coming_up) {
584 ieee80211_del_virtual_monitor(local);
585
586 res = drv_add_interface(local, sdata);
587 if (res)
588 goto err_stop;
589 res = ieee80211_check_queues(sdata);
590 if (res)
591 goto err_del_interface;
592 }
593
594 if (sdata->vif.type == NL80211_IFTYPE_AP) {
595 local->fif_pspoll++;
596 local->fif_probe_req++;
597
598 ieee80211_configure_filter(local);
599 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
600 local->fif_probe_req++;
601 }
602
603 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
604 changed |= ieee80211_reset_erp_info(sdata);
605 ieee80211_bss_info_change_notify(sdata, changed);
606
607 switch (sdata->vif.type) {
608 case NL80211_IFTYPE_STATION:
609 case NL80211_IFTYPE_ADHOC:
610 case NL80211_IFTYPE_AP:
611 case NL80211_IFTYPE_MESH_POINT:
612 netif_carrier_off(dev);
613 break;
614 case NL80211_IFTYPE_WDS:
615 case NL80211_IFTYPE_P2P_DEVICE:
616 break;
617 default:
618 /* not reached */
619 WARN_ON(1);
620 }
621
622 /*
623 * set default queue parameters so drivers don't
624 * need to initialise the hardware if the hardware
625 * doesn't start up with sane defaults
626 */
627 ieee80211_set_wmm_default(sdata, true);
628 }
629
630 set_bit(SDATA_STATE_RUNNING, &sdata->state);
631
632 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
633 /* Create STA entry for the WDS peer */
634 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
635 GFP_KERNEL);
636 if (!sta) {
637 res = -ENOMEM;
638 goto err_del_interface;
639 }
640
641 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
642 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
643 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
644
645 res = sta_info_insert(sta);
646 if (res) {
647 /* STA has been freed */
648 goto err_del_interface;
649 }
650
651 rate_control_rate_init(sta);
652 netif_carrier_on(dev);
653 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
654 rcu_assign_pointer(local->p2p_sdata, sdata);
655 }
656
657 /*
658 * set_multicast_list will be invoked by the networking core
659 * which will check whether any increments here were done in
660 * error and sync them down to the hardware as filter flags.
661 */
662 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
663 atomic_inc(&local->iff_allmultis);
664
665 if (sdata->flags & IEEE80211_SDATA_PROMISC)
666 atomic_inc(&local->iff_promiscs);
667
668 if (coming_up)
669 local->open_count++;
670
671 if (hw_reconf_flags)
672 ieee80211_hw_config(local, hw_reconf_flags);
673
674 ieee80211_recalc_ps(local, -1);
675
676 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
677 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
678 /* XXX: for AP_VLAN, actually track AP queues */
679 netif_tx_start_all_queues(dev);
680 } else if (dev) {
681 unsigned long flags;
682 int n_acs = IEEE80211_NUM_ACS;
683 int ac;
684
685 if (local->hw.queues < IEEE80211_NUM_ACS)
686 n_acs = 1;
687
688 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
689 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
690 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
691 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
692 for (ac = 0; ac < n_acs; ac++) {
693 int ac_queue = sdata->vif.hw_queue[ac];
694
695 if (local->queue_stop_reasons[ac_queue] == 0 &&
696 skb_queue_empty(&local->pending[ac_queue]))
697 netif_start_subqueue(dev, ac);
698 }
699 }
700 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
701 }
702
703 return 0;
704 err_del_interface:
705 drv_remove_interface(local, sdata);
706 err_stop:
707 if (!local->open_count)
708 drv_stop(local);
709 err_del_bss:
710 sdata->bss = NULL;
711 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
712 list_del(&sdata->u.vlan.list);
713 /* might already be clear but that doesn't matter */
714 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
715 return res;
716 }
717
718 static int ieee80211_open(struct net_device *dev)
719 {
720 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
721 int err;
722
723 /* fail early if user set an invalid address */
724 if (!is_valid_ether_addr(dev->dev_addr))
725 return -EADDRNOTAVAIL;
726
727 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
728 if (err)
729 return err;
730
731 return ieee80211_do_open(&sdata->wdev, true);
732 }
733
734 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
735 bool going_down)
736 {
737 struct ieee80211_local *local = sdata->local;
738 unsigned long flags;
739 struct sk_buff *skb, *tmp;
740 u32 hw_reconf_flags = 0;
741 int i, flushed;
742 struct ps_data *ps;
743
744 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
745
746 if (rcu_access_pointer(local->scan_sdata) == sdata)
747 ieee80211_scan_cancel(local);
748
749 /*
750 * Stop TX on this interface first.
751 */
752 if (sdata->dev)
753 netif_tx_stop_all_queues(sdata->dev);
754
755 ieee80211_roc_purge(local, sdata);
756
757 if (sdata->vif.type == NL80211_IFTYPE_STATION)
758 ieee80211_mgd_stop(sdata);
759
760 /*
761 * Remove all stations associated with this interface.
762 *
763 * This must be done before calling ops->remove_interface()
764 * because otherwise we can later invoke ops->sta_notify()
765 * whenever the STAs are removed, and that invalidates driver
766 * assumptions about always getting a vif pointer that is valid
767 * (because if we remove a STA after ops->remove_interface()
768 * the driver will have removed the vif info already!)
769 *
770 * This is relevant only in WDS mode, in all other modes we've
771 * already removed all stations when disconnecting or similar,
772 * so warn otherwise.
773 *
774 * We call sta_info_flush_cleanup() later, to combine RCU waits.
775 */
776 flushed = sta_info_flush_defer(sdata);
777 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
778 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
779
780 /* don't count this interface for promisc/allmulti while it is down */
781 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
782 atomic_dec(&local->iff_allmultis);
783
784 if (sdata->flags & IEEE80211_SDATA_PROMISC)
785 atomic_dec(&local->iff_promiscs);
786
787 if (sdata->vif.type == NL80211_IFTYPE_AP) {
788 local->fif_pspoll--;
789 local->fif_probe_req--;
790 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
791 local->fif_probe_req--;
792 }
793
794 if (sdata->dev) {
795 netif_addr_lock_bh(sdata->dev);
796 spin_lock_bh(&local->filter_lock);
797 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
798 sdata->dev->addr_len);
799 spin_unlock_bh(&local->filter_lock);
800 netif_addr_unlock_bh(sdata->dev);
801 }
802
803 del_timer_sync(&local->dynamic_ps_timer);
804 cancel_work_sync(&local->dynamic_ps_enable_work);
805
806 cancel_work_sync(&sdata->recalc_smps);
807
808 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
809
810 if (sdata->wdev.cac_started) {
811 WARN_ON(local->suspended);
812 mutex_lock(&local->iflist_mtx);
813 ieee80211_vif_release_channel(sdata);
814 mutex_unlock(&local->iflist_mtx);
815 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
816 GFP_KERNEL);
817 }
818
819 /* APs need special treatment */
820 if (sdata->vif.type == NL80211_IFTYPE_AP) {
821 struct ieee80211_sub_if_data *vlan, *tmpsdata;
822
823 /* down all dependent devices, that is VLANs */
824 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
825 u.vlan.list)
826 dev_close(vlan->dev);
827 WARN_ON(!list_empty(&sdata->u.ap.vlans));
828 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
829 /* remove all packets in parent bc_buf pointing to this dev */
830 ps = &sdata->bss->ps;
831
832 spin_lock_irqsave(&ps->bc_buf.lock, flags);
833 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
834 if (skb->dev == sdata->dev) {
835 __skb_unlink(skb, &ps->bc_buf);
836 local->total_ps_buffered--;
837 ieee80211_free_txskb(&local->hw, skb);
838 }
839 }
840 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
841 }
842
843 if (going_down)
844 local->open_count--;
845
846 switch (sdata->vif.type) {
847 case NL80211_IFTYPE_AP_VLAN:
848 list_del(&sdata->u.vlan.list);
849 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
850 /* no need to tell driver */
851 break;
852 case NL80211_IFTYPE_MONITOR:
853 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
854 local->cooked_mntrs--;
855 break;
856 }
857
858 local->monitors--;
859 if (local->monitors == 0) {
860 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
861 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
862 }
863
864 ieee80211_adjust_monitor_flags(sdata, -1);
865 break;
866 case NL80211_IFTYPE_P2P_DEVICE:
867 /* relies on synchronize_rcu() below */
868 rcu_assign_pointer(local->p2p_sdata, NULL);
869 /* fall through */
870 default:
871 cancel_work_sync(&sdata->work);
872 /*
873 * When we get here, the interface is marked down.
874 *
875 * sta_info_flush_cleanup() requires rcu_barrier()
876 * first to wait for the station call_rcu() calls
877 * to complete, and we also need synchronize_rcu()
878 * to wait for the RX path in case it is using the
879 * interface and enqueuing frames at this very time on
880 * another CPU.
881 */
882 synchronize_rcu();
883 rcu_barrier();
884 sta_info_flush_cleanup(sdata);
885
886 /*
887 * Free all remaining keys, there shouldn't be any,
888 * except maybe in WDS mode?
889 */
890 ieee80211_free_keys(sdata);
891
892 /* fall through */
893 case NL80211_IFTYPE_AP:
894 skb_queue_purge(&sdata->skb_queue);
895 }
896
897 sdata->bss = NULL;
898
899 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
900 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
901 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
902 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
903 if (info->control.vif == &sdata->vif) {
904 __skb_unlink(skb, &local->pending[i]);
905 ieee80211_free_txskb(&local->hw, skb);
906 }
907 }
908 }
909 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
910
911 if (local->open_count == 0)
912 ieee80211_clear_tx_pending(local);
913
914 /*
915 * If the interface goes down while suspended, presumably because
916 * the device was unplugged and that happens before our resume,
917 * then the driver is already unconfigured and the remainder of
918 * this function isn't needed.
919 * XXX: what about WoWLAN? If the device has software state, e.g.
920 * memory allocated, it might expect teardown commands from
921 * mac80211 here?
922 */
923 if (local->suspended) {
924 WARN_ON(local->wowlan);
925 WARN_ON(rtnl_dereference(local->monitor_sdata));
926 return;
927 }
928
929 switch (sdata->vif.type) {
930 case NL80211_IFTYPE_AP_VLAN:
931 break;
932 case NL80211_IFTYPE_MONITOR:
933 if (local->monitors == 0)
934 ieee80211_del_virtual_monitor(local);
935
936 mutex_lock(&local->mtx);
937 ieee80211_recalc_idle(local);
938 mutex_unlock(&local->mtx);
939
940 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
941 break;
942
943 /* fall through */
944 default:
945 if (going_down)
946 drv_remove_interface(local, sdata);
947 }
948
949 ieee80211_recalc_ps(local, -1);
950
951 if (local->open_count == 0) {
952 ieee80211_stop_device(local);
953
954 /* no reconfiguring after stop! */
955 return;
956 }
957
958 /* do after stop to avoid reconfiguring when we stop anyway */
959 ieee80211_configure_filter(local);
960 ieee80211_hw_config(local, hw_reconf_flags);
961
962 if (local->monitors == local->open_count)
963 ieee80211_add_virtual_monitor(local);
964 }
965
966 static int ieee80211_stop(struct net_device *dev)
967 {
968 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
969
970 ieee80211_do_stop(sdata, true);
971
972 return 0;
973 }
974
975 static void ieee80211_set_multicast_list(struct net_device *dev)
976 {
977 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
978 struct ieee80211_local *local = sdata->local;
979 int allmulti, promisc, sdata_allmulti, sdata_promisc;
980
981 allmulti = !!(dev->flags & IFF_ALLMULTI);
982 promisc = !!(dev->flags & IFF_PROMISC);
983 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
984 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
985
986 if (allmulti != sdata_allmulti) {
987 if (dev->flags & IFF_ALLMULTI)
988 atomic_inc(&local->iff_allmultis);
989 else
990 atomic_dec(&local->iff_allmultis);
991 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
992 }
993
994 if (promisc != sdata_promisc) {
995 if (dev->flags & IFF_PROMISC)
996 atomic_inc(&local->iff_promiscs);
997 else
998 atomic_dec(&local->iff_promiscs);
999 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1000 }
1001
1002 /*
1003 * TODO: If somebody needs this on AP interfaces,
1004 * it can be enabled easily but multicast
1005 * addresses from VLANs need to be synced.
1006 */
1007 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1008 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1009 sdata->vif.type != NL80211_IFTYPE_AP)
1010 drv_set_multicast_list(local, sdata, &dev->mc);
1011
1012 spin_lock_bh(&local->filter_lock);
1013 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1014 spin_unlock_bh(&local->filter_lock);
1015 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1016 }
1017
1018 /*
1019 * Called when the netdev is removed or, by the code below, before
1020 * the interface type changes.
1021 */
1022 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1023 {
1024 int flushed;
1025 int i;
1026
1027 /* free extra data */
1028 ieee80211_free_keys(sdata);
1029
1030 ieee80211_debugfs_remove_netdev(sdata);
1031
1032 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1033 __skb_queue_purge(&sdata->fragments[i].skb_list);
1034 sdata->fragment_next = 0;
1035
1036 if (ieee80211_vif_is_mesh(&sdata->vif))
1037 mesh_rmc_free(sdata);
1038
1039 flushed = sta_info_flush(sdata);
1040 WARN_ON(flushed);
1041 }
1042
1043 static void ieee80211_uninit(struct net_device *dev)
1044 {
1045 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1046 }
1047
1048 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1049 struct sk_buff *skb)
1050 {
1051 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1052 }
1053
1054 static const struct net_device_ops ieee80211_dataif_ops = {
1055 .ndo_open = ieee80211_open,
1056 .ndo_stop = ieee80211_stop,
1057 .ndo_uninit = ieee80211_uninit,
1058 .ndo_start_xmit = ieee80211_subif_start_xmit,
1059 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1060 .ndo_change_mtu = ieee80211_change_mtu,
1061 .ndo_set_mac_address = ieee80211_change_mac,
1062 .ndo_select_queue = ieee80211_netdev_select_queue,
1063 };
1064
1065 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1066 struct sk_buff *skb)
1067 {
1068 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1069 struct ieee80211_local *local = sdata->local;
1070 struct ieee80211_hdr *hdr;
1071 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1072
1073 if (local->hw.queues < IEEE80211_NUM_ACS)
1074 return 0;
1075
1076 if (skb->len < 4 ||
1077 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1078 return 0; /* doesn't matter, frame will be dropped */
1079
1080 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1081
1082 return ieee80211_select_queue_80211(sdata, skb, hdr);
1083 }
1084
1085 static const struct net_device_ops ieee80211_monitorif_ops = {
1086 .ndo_open = ieee80211_open,
1087 .ndo_stop = ieee80211_stop,
1088 .ndo_uninit = ieee80211_uninit,
1089 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1090 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1091 .ndo_change_mtu = ieee80211_change_mtu,
1092 .ndo_set_mac_address = ieee80211_change_mac,
1093 .ndo_select_queue = ieee80211_monitor_select_queue,
1094 };
1095
1096 static void ieee80211_if_setup(struct net_device *dev)
1097 {
1098 ether_setup(dev);
1099 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1100 dev->netdev_ops = &ieee80211_dataif_ops;
1101 dev->destructor = free_netdev;
1102 }
1103
1104 static void ieee80211_iface_work(struct work_struct *work)
1105 {
1106 struct ieee80211_sub_if_data *sdata =
1107 container_of(work, struct ieee80211_sub_if_data, work);
1108 struct ieee80211_local *local = sdata->local;
1109 struct sk_buff *skb;
1110 struct sta_info *sta;
1111 struct ieee80211_ra_tid *ra_tid;
1112
1113 if (!ieee80211_sdata_running(sdata))
1114 return;
1115
1116 if (local->scanning)
1117 return;
1118
1119 /*
1120 * ieee80211_queue_work() should have picked up most cases,
1121 * here we'll pick the rest.
1122 */
1123 if (WARN(local->suspended,
1124 "interface work scheduled while going to suspend\n"))
1125 return;
1126
1127 /* first process frames */
1128 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1129 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1130
1131 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1132 ra_tid = (void *)&skb->cb;
1133 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1134 ra_tid->tid);
1135 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1136 ra_tid = (void *)&skb->cb;
1137 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1138 ra_tid->tid);
1139 } else if (ieee80211_is_action(mgmt->frame_control) &&
1140 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1141 int len = skb->len;
1142
1143 mutex_lock(&local->sta_mtx);
1144 sta = sta_info_get_bss(sdata, mgmt->sa);
1145 if (sta) {
1146 switch (mgmt->u.action.u.addba_req.action_code) {
1147 case WLAN_ACTION_ADDBA_REQ:
1148 ieee80211_process_addba_request(
1149 local, sta, mgmt, len);
1150 break;
1151 case WLAN_ACTION_ADDBA_RESP:
1152 ieee80211_process_addba_resp(local, sta,
1153 mgmt, len);
1154 break;
1155 case WLAN_ACTION_DELBA:
1156 ieee80211_process_delba(sdata, sta,
1157 mgmt, len);
1158 break;
1159 default:
1160 WARN_ON(1);
1161 break;
1162 }
1163 }
1164 mutex_unlock(&local->sta_mtx);
1165 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1166 struct ieee80211_hdr *hdr = (void *)mgmt;
1167 /*
1168 * So the frame isn't mgmt, but frame_control
1169 * is at the right place anyway, of course, so
1170 * the if statement is correct.
1171 *
1172 * Warn if we have other data frame types here,
1173 * they must not get here.
1174 */
1175 WARN_ON(hdr->frame_control &
1176 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1177 WARN_ON(!(hdr->seq_ctrl &
1178 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1179 /*
1180 * This was a fragment of a frame, received while
1181 * a block-ack session was active. That cannot be
1182 * right, so terminate the session.
1183 */
1184 mutex_lock(&local->sta_mtx);
1185 sta = sta_info_get_bss(sdata, mgmt->sa);
1186 if (sta) {
1187 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1188 IEEE80211_QOS_CTL_TID_MASK;
1189
1190 __ieee80211_stop_rx_ba_session(
1191 sta, tid, WLAN_BACK_RECIPIENT,
1192 WLAN_REASON_QSTA_REQUIRE_SETUP,
1193 true);
1194 }
1195 mutex_unlock(&local->sta_mtx);
1196 } else switch (sdata->vif.type) {
1197 case NL80211_IFTYPE_STATION:
1198 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1199 break;
1200 case NL80211_IFTYPE_ADHOC:
1201 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1202 break;
1203 case NL80211_IFTYPE_MESH_POINT:
1204 if (!ieee80211_vif_is_mesh(&sdata->vif))
1205 break;
1206 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1207 break;
1208 default:
1209 WARN(1, "frame for unexpected interface type");
1210 break;
1211 }
1212
1213 kfree_skb(skb);
1214 }
1215
1216 /* then other type-dependent work */
1217 switch (sdata->vif.type) {
1218 case NL80211_IFTYPE_STATION:
1219 ieee80211_sta_work(sdata);
1220 break;
1221 case NL80211_IFTYPE_ADHOC:
1222 ieee80211_ibss_work(sdata);
1223 break;
1224 case NL80211_IFTYPE_MESH_POINT:
1225 if (!ieee80211_vif_is_mesh(&sdata->vif))
1226 break;
1227 ieee80211_mesh_work(sdata);
1228 break;
1229 default:
1230 break;
1231 }
1232 }
1233
1234 static void ieee80211_recalc_smps_work(struct work_struct *work)
1235 {
1236 struct ieee80211_sub_if_data *sdata =
1237 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1238
1239 ieee80211_recalc_smps(sdata);
1240 }
1241
1242 /*
1243 * Helper function to initialise an interface to a specific type.
1244 */
1245 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1246 enum nl80211_iftype type)
1247 {
1248 /* clear type-dependent union */
1249 memset(&sdata->u, 0, sizeof(sdata->u));
1250
1251 /* and set some type-dependent values */
1252 sdata->vif.type = type;
1253 sdata->vif.p2p = false;
1254 sdata->wdev.iftype = type;
1255
1256 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1257 sdata->control_port_no_encrypt = false;
1258
1259 sdata->noack_map = 0;
1260
1261 /* only monitor/p2p-device differ */
1262 if (sdata->dev) {
1263 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1264 sdata->dev->type = ARPHRD_ETHER;
1265 }
1266
1267 skb_queue_head_init(&sdata->skb_queue);
1268 INIT_WORK(&sdata->work, ieee80211_iface_work);
1269 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1270
1271 switch (type) {
1272 case NL80211_IFTYPE_P2P_GO:
1273 type = NL80211_IFTYPE_AP;
1274 sdata->vif.type = type;
1275 sdata->vif.p2p = true;
1276 /* fall through */
1277 case NL80211_IFTYPE_AP:
1278 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1279 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1280 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1281 break;
1282 case NL80211_IFTYPE_P2P_CLIENT:
1283 type = NL80211_IFTYPE_STATION;
1284 sdata->vif.type = type;
1285 sdata->vif.p2p = true;
1286 /* fall through */
1287 case NL80211_IFTYPE_STATION:
1288 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1289 ieee80211_sta_setup_sdata(sdata);
1290 break;
1291 case NL80211_IFTYPE_ADHOC:
1292 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1293 ieee80211_ibss_setup_sdata(sdata);
1294 break;
1295 case NL80211_IFTYPE_MESH_POINT:
1296 if (ieee80211_vif_is_mesh(&sdata->vif))
1297 ieee80211_mesh_init_sdata(sdata);
1298 break;
1299 case NL80211_IFTYPE_MONITOR:
1300 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1301 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1302 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1303 MONITOR_FLAG_OTHER_BSS;
1304 break;
1305 case NL80211_IFTYPE_WDS:
1306 sdata->vif.bss_conf.bssid = NULL;
1307 break;
1308 case NL80211_IFTYPE_AP_VLAN:
1309 break;
1310 case NL80211_IFTYPE_P2P_DEVICE:
1311 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1312 break;
1313 case NL80211_IFTYPE_UNSPECIFIED:
1314 case NUM_NL80211_IFTYPES:
1315 BUG();
1316 break;
1317 }
1318
1319 ieee80211_debugfs_add_netdev(sdata);
1320 }
1321
1322 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1323 enum nl80211_iftype type)
1324 {
1325 struct ieee80211_local *local = sdata->local;
1326 int ret, err;
1327 enum nl80211_iftype internal_type = type;
1328 bool p2p = false;
1329
1330 ASSERT_RTNL();
1331
1332 if (!local->ops->change_interface)
1333 return -EBUSY;
1334
1335 switch (sdata->vif.type) {
1336 case NL80211_IFTYPE_AP:
1337 case NL80211_IFTYPE_STATION:
1338 case NL80211_IFTYPE_ADHOC:
1339 /*
1340 * Could maybe also all others here?
1341 * Just not sure how that interacts
1342 * with the RX/config path e.g. for
1343 * mesh.
1344 */
1345 break;
1346 default:
1347 return -EBUSY;
1348 }
1349
1350 switch (type) {
1351 case NL80211_IFTYPE_AP:
1352 case NL80211_IFTYPE_STATION:
1353 case NL80211_IFTYPE_ADHOC:
1354 /*
1355 * Could probably support everything
1356 * but WDS here (WDS do_open can fail
1357 * under memory pressure, which this
1358 * code isn't prepared to handle).
1359 */
1360 break;
1361 case NL80211_IFTYPE_P2P_CLIENT:
1362 p2p = true;
1363 internal_type = NL80211_IFTYPE_STATION;
1364 break;
1365 case NL80211_IFTYPE_P2P_GO:
1366 p2p = true;
1367 internal_type = NL80211_IFTYPE_AP;
1368 break;
1369 default:
1370 return -EBUSY;
1371 }
1372
1373 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1374 if (ret)
1375 return ret;
1376
1377 ieee80211_do_stop(sdata, false);
1378
1379 ieee80211_teardown_sdata(sdata);
1380
1381 ret = drv_change_interface(local, sdata, internal_type, p2p);
1382 if (ret)
1383 type = sdata->vif.type;
1384
1385 /*
1386 * Ignore return value here, there's not much we can do since
1387 * the driver changed the interface type internally already.
1388 * The warnings will hopefully make driver authors fix it :-)
1389 */
1390 ieee80211_check_queues(sdata);
1391
1392 ieee80211_setup_sdata(sdata, type);
1393
1394 err = ieee80211_do_open(&sdata->wdev, false);
1395 WARN(err, "type change: do_open returned %d", err);
1396
1397 return ret;
1398 }
1399
1400 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1401 enum nl80211_iftype type)
1402 {
1403 int ret;
1404
1405 ASSERT_RTNL();
1406
1407 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1408 return 0;
1409
1410 if (ieee80211_sdata_running(sdata)) {
1411 ret = ieee80211_runtime_change_iftype(sdata, type);
1412 if (ret)
1413 return ret;
1414 } else {
1415 /* Purge and reset type-dependent state. */
1416 ieee80211_teardown_sdata(sdata);
1417 ieee80211_setup_sdata(sdata, type);
1418 }
1419
1420 /* reset some values that shouldn't be kept across type changes */
1421 sdata->drop_unencrypted = 0;
1422 if (type == NL80211_IFTYPE_STATION)
1423 sdata->u.mgd.use_4addr = false;
1424
1425 return 0;
1426 }
1427
1428 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1429 u8 *perm_addr, enum nl80211_iftype type)
1430 {
1431 struct ieee80211_sub_if_data *sdata;
1432 u64 mask, start, addr, val, inc;
1433 u8 *m;
1434 u8 tmp_addr[ETH_ALEN];
1435 int i;
1436
1437 /* default ... something at least */
1438 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1439
1440 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1441 local->hw.wiphy->n_addresses <= 1)
1442 return;
1443
1444 mutex_lock(&local->iflist_mtx);
1445
1446 switch (type) {
1447 case NL80211_IFTYPE_MONITOR:
1448 /* doesn't matter */
1449 break;
1450 case NL80211_IFTYPE_WDS:
1451 case NL80211_IFTYPE_AP_VLAN:
1452 /* match up with an AP interface */
1453 list_for_each_entry(sdata, &local->interfaces, list) {
1454 if (sdata->vif.type != NL80211_IFTYPE_AP)
1455 continue;
1456 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1457 break;
1458 }
1459 /* keep default if no AP interface present */
1460 break;
1461 case NL80211_IFTYPE_P2P_CLIENT:
1462 case NL80211_IFTYPE_P2P_GO:
1463 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1464 list_for_each_entry(sdata, &local->interfaces, list) {
1465 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1466 continue;
1467 if (!ieee80211_sdata_running(sdata))
1468 continue;
1469 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1470 goto out_unlock;
1471 }
1472 }
1473 /* otherwise fall through */
1474 default:
1475 /* assign a new address if possible -- try n_addresses first */
1476 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1477 bool used = false;
1478
1479 list_for_each_entry(sdata, &local->interfaces, list) {
1480 if (memcmp(local->hw.wiphy->addresses[i].addr,
1481 sdata->vif.addr, ETH_ALEN) == 0) {
1482 used = true;
1483 break;
1484 }
1485 }
1486
1487 if (!used) {
1488 memcpy(perm_addr,
1489 local->hw.wiphy->addresses[i].addr,
1490 ETH_ALEN);
1491 break;
1492 }
1493 }
1494
1495 /* try mask if available */
1496 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1497 break;
1498
1499 m = local->hw.wiphy->addr_mask;
1500 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1501 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1502 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1503
1504 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1505 /* not a contiguous mask ... not handled now! */
1506 pr_info("not contiguous\n");
1507 break;
1508 }
1509
1510 /*
1511 * Pick address of existing interface in case user changed
1512 * MAC address manually, default to perm_addr.
1513 */
1514 m = local->hw.wiphy->perm_addr;
1515 list_for_each_entry(sdata, &local->interfaces, list) {
1516 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1517 continue;
1518 m = sdata->vif.addr;
1519 break;
1520 }
1521 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1522 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1523 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1524
1525 inc = 1ULL<<__ffs64(mask);
1526 val = (start & mask);
1527 addr = (start & ~mask) | (val & mask);
1528 do {
1529 bool used = false;
1530
1531 tmp_addr[5] = addr >> 0*8;
1532 tmp_addr[4] = addr >> 1*8;
1533 tmp_addr[3] = addr >> 2*8;
1534 tmp_addr[2] = addr >> 3*8;
1535 tmp_addr[1] = addr >> 4*8;
1536 tmp_addr[0] = addr >> 5*8;
1537
1538 val += inc;
1539
1540 list_for_each_entry(sdata, &local->interfaces, list) {
1541 if (memcmp(tmp_addr, sdata->vif.addr,
1542 ETH_ALEN) == 0) {
1543 used = true;
1544 break;
1545 }
1546 }
1547
1548 if (!used) {
1549 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1550 break;
1551 }
1552 addr = (start & ~mask) | (val & mask);
1553 } while (addr != start);
1554
1555 break;
1556 }
1557
1558 out_unlock:
1559 mutex_unlock(&local->iflist_mtx);
1560 }
1561
1562 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1563 {
1564 struct ieee80211_sub_if_data *sdata;
1565
1566 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1567
1568 ieee80211_cleanup_sdata_stas(sdata);
1569 }
1570
1571 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1572 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1573 struct vif_params *params)
1574 {
1575 struct net_device *ndev = NULL;
1576 struct ieee80211_sub_if_data *sdata = NULL;
1577 int ret, i;
1578 int txqs = 1;
1579
1580 ASSERT_RTNL();
1581
1582 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1583 struct wireless_dev *wdev;
1584
1585 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1586 GFP_KERNEL);
1587 if (!sdata)
1588 return -ENOMEM;
1589 wdev = &sdata->wdev;
1590
1591 sdata->dev = NULL;
1592 strlcpy(sdata->name, name, IFNAMSIZ);
1593 ieee80211_assign_perm_addr(local, wdev->address, type);
1594 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1595 } else {
1596 if (local->hw.queues >= IEEE80211_NUM_ACS)
1597 txqs = IEEE80211_NUM_ACS;
1598
1599 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1600 local->hw.vif_data_size,
1601 name, ieee80211_if_setup, txqs, 1);
1602 if (!ndev)
1603 return -ENOMEM;
1604 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1605
1606 ndev->needed_headroom = local->tx_headroom +
1607 4*6 /* four MAC addresses */
1608 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1609 + 6 /* mesh */
1610 + 8 /* rfc1042/bridge tunnel */
1611 - ETH_HLEN /* ethernet hard_header_len */
1612 + IEEE80211_ENCRYPT_HEADROOM;
1613 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1614
1615 ret = dev_alloc_name(ndev, ndev->name);
1616 if (ret < 0) {
1617 free_netdev(ndev);
1618 return ret;
1619 }
1620
1621 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1622 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1623 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1624
1625 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1626 sdata = netdev_priv(ndev);
1627 ndev->ieee80211_ptr = &sdata->wdev;
1628 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1629 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1630
1631 sdata->dev = ndev;
1632 }
1633
1634 /* initialise type-independent data */
1635 sdata->wdev.wiphy = local->hw.wiphy;
1636 sdata->local = local;
1637
1638 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1639 skb_queue_head_init(&sdata->fragments[i].skb_list);
1640
1641 INIT_LIST_HEAD(&sdata->key_list);
1642
1643 spin_lock_init(&sdata->cleanup_stations_lock);
1644 INIT_LIST_HEAD(&sdata->cleanup_stations);
1645 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1646 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1647 ieee80211_dfs_cac_timer_work);
1648 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1649 ieee80211_delayed_tailroom_dec);
1650
1651 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1652 struct ieee80211_supported_band *sband;
1653 sband = local->hw.wiphy->bands[i];
1654 sdata->rc_rateidx_mask[i] =
1655 sband ? (1 << sband->n_bitrates) - 1 : 0;
1656 if (sband)
1657 memcpy(sdata->rc_rateidx_mcs_mask[i],
1658 sband->ht_cap.mcs.rx_mask,
1659 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1660 else
1661 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1662 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1663 }
1664
1665 ieee80211_set_default_queues(sdata);
1666
1667 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1668 sdata->user_power_level = local->user_power_level;
1669
1670 /* setup type-dependent data */
1671 ieee80211_setup_sdata(sdata, type);
1672
1673 if (ndev) {
1674 if (params) {
1675 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1676 if (type == NL80211_IFTYPE_STATION)
1677 sdata->u.mgd.use_4addr = params->use_4addr;
1678 }
1679
1680 ndev->features |= local->hw.netdev_features;
1681
1682 ret = register_netdevice(ndev);
1683 if (ret) {
1684 free_netdev(ndev);
1685 return ret;
1686 }
1687 }
1688
1689 mutex_lock(&local->iflist_mtx);
1690 list_add_tail_rcu(&sdata->list, &local->interfaces);
1691 mutex_unlock(&local->iflist_mtx);
1692
1693 if (new_wdev)
1694 *new_wdev = &sdata->wdev;
1695
1696 return 0;
1697 }
1698
1699 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1700 {
1701 ASSERT_RTNL();
1702
1703 mutex_lock(&sdata->local->iflist_mtx);
1704 list_del_rcu(&sdata->list);
1705 mutex_unlock(&sdata->local->iflist_mtx);
1706
1707 synchronize_rcu();
1708
1709 if (sdata->dev) {
1710 unregister_netdevice(sdata->dev);
1711 } else {
1712 cfg80211_unregister_wdev(&sdata->wdev);
1713 kfree(sdata);
1714 }
1715 }
1716
1717 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1718 {
1719 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1720 return;
1721 ieee80211_do_stop(sdata, true);
1722 ieee80211_teardown_sdata(sdata);
1723 }
1724
1725 /*
1726 * Remove all interfaces, may only be called at hardware unregistration
1727 * time because it doesn't do RCU-safe list removals.
1728 */
1729 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1730 {
1731 struct ieee80211_sub_if_data *sdata, *tmp;
1732 LIST_HEAD(unreg_list);
1733 LIST_HEAD(wdev_list);
1734
1735 ASSERT_RTNL();
1736
1737 /*
1738 * Close all AP_VLAN interfaces first, as otherwise they
1739 * might be closed while the AP interface they belong to
1740 * is closed, causing unregister_netdevice_many() to crash.
1741 */
1742 list_for_each_entry(sdata, &local->interfaces, list)
1743 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1744 dev_close(sdata->dev);
1745
1746 mutex_lock(&local->iflist_mtx);
1747 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1748 list_del(&sdata->list);
1749
1750 if (sdata->dev)
1751 unregister_netdevice_queue(sdata->dev, &unreg_list);
1752 else
1753 list_add(&sdata->list, &wdev_list);
1754 }
1755 mutex_unlock(&local->iflist_mtx);
1756 unregister_netdevice_many(&unreg_list);
1757 list_del(&unreg_list);
1758
1759 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1760 list_del(&sdata->list);
1761 cfg80211_unregister_wdev(&sdata->wdev);
1762 kfree(sdata);
1763 }
1764 }
1765
1766 static int netdev_notify(struct notifier_block *nb,
1767 unsigned long state, void *ptr)
1768 {
1769 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1770 struct ieee80211_sub_if_data *sdata;
1771
1772 if (state != NETDEV_CHANGENAME)
1773 return 0;
1774
1775 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1776 return 0;
1777
1778 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1779 return 0;
1780
1781 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1782
1783 memcpy(sdata->name, dev->name, IFNAMSIZ);
1784
1785 ieee80211_debugfs_rename_netdev(sdata);
1786 return 0;
1787 }
1788
1789 static struct notifier_block mac80211_netdev_notifier = {
1790 .notifier_call = netdev_notify,
1791 };
1792
1793 int ieee80211_iface_init(void)
1794 {
1795 return register_netdevice_notifier(&mac80211_netdev_notifier);
1796 }
1797
1798 void ieee80211_iface_exit(void)
1799 {
1800 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1801 }
Linus' kernel tree