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[deliverable/linux.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 int power;
49
50 rcu_read_lock();
51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 if (!chanctx_conf) {
53 rcu_read_unlock();
54 return false;
55 }
56
57 power = ieee80211_chandef_max_power(&chanctx_conf->def);
58 rcu_read_unlock();
59
60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 power = min(power, sdata->user_power_level);
62
63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->ap_power_level);
65
66 if (power != sdata->vif.bss_conf.txpower) {
67 sdata->vif.bss_conf.txpower = power;
68 ieee80211_hw_config(sdata->local, 0);
69 return true;
70 }
71
72 return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 if (__ieee80211_recalc_txpower(sdata))
78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
82 {
83 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84 return 0;
85
86 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87 return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
91 {
92 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93 return 0;
94
95 ieee80211_flush_queues(local, NULL);
96
97 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102 bool force_active)
103 {
104 bool working = 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 * will not add another interface while any channel
279 * switch is active.
280 */
281 if (nsdata->vif.csa_active)
282 return -EBUSY;
283
284 /*
285 * The remaining checks are only performed for interfaces
286 * with the same MAC address.
287 */
288 if (!ether_addr_equal(sdata->vif.addr,
289 nsdata->vif.addr))
290 continue;
291
292 /*
293 * check whether it may have the same address
294 */
295 if (!identical_mac_addr_allowed(iftype,
296 nsdata->vif.type))
297 return -ENOTUNIQ;
298
299 /*
300 * can only add VLANs to enabled APs
301 */
302 if (iftype == NL80211_IFTYPE_AP_VLAN &&
303 nsdata->vif.type == NL80211_IFTYPE_AP)
304 sdata->bss = &nsdata->u.ap;
305 }
306 }
307
308 return 0;
309 }
310
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 enum nl80211_iftype iftype)
313 {
314 int n_queues = sdata->local->hw.queues;
315 int i;
316
317 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
318 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320 IEEE80211_INVAL_HW_QUEUE))
321 return -EINVAL;
322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323 n_queues))
324 return -EINVAL;
325 }
326 }
327
328 if ((iftype != NL80211_IFTYPE_AP &&
329 iftype != NL80211_IFTYPE_P2P_GO &&
330 iftype != NL80211_IFTYPE_MESH_POINT) ||
331 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333 return 0;
334 }
335
336 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337 return -EINVAL;
338
339 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340 return -EINVAL;
341
342 return 0;
343 }
344
345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346 const int offset)
347 {
348 struct ieee80211_local *local = sdata->local;
349 u32 flags = sdata->u.mntr_flags;
350
351 #define ADJUST(_f, _s) do { \
352 if (flags & MONITOR_FLAG_##_f) \
353 local->fif_##_s += offset; \
354 } while (0)
355
356 ADJUST(FCSFAIL, fcsfail);
357 ADJUST(PLCPFAIL, plcpfail);
358 ADJUST(CONTROL, control);
359 ADJUST(CONTROL, pspoll);
360 ADJUST(OTHER_BSS, other_bss);
361
362 #undef ADJUST
363 }
364
365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367 struct ieee80211_local *local = sdata->local;
368 int i;
369
370 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373 else if (local->hw.queues >= IEEE80211_NUM_ACS)
374 sdata->vif.hw_queue[i] = i;
375 else
376 sdata->vif.hw_queue[i] = 0;
377 }
378 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380
381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383 struct ieee80211_sub_if_data *sdata;
384 int ret;
385
386 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387 return 0;
388
389 ASSERT_RTNL();
390
391 if (local->monitor_sdata)
392 return 0;
393
394 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395 if (!sdata)
396 return -ENOMEM;
397
398 /* set up data */
399 sdata->local = local;
400 sdata->vif.type = NL80211_IFTYPE_MONITOR;
401 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402 wiphy_name(local->hw.wiphy));
403
404 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
405
406 ieee80211_set_default_queues(sdata);
407
408 ret = drv_add_interface(local, sdata);
409 if (WARN_ON(ret)) {
410 /* ok .. stupid driver, it asked for this! */
411 kfree(sdata);
412 return ret;
413 }
414
415 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
416 if (ret) {
417 kfree(sdata);
418 return ret;
419 }
420
421 mutex_lock(&local->iflist_mtx);
422 rcu_assign_pointer(local->monitor_sdata, sdata);
423 mutex_unlock(&local->iflist_mtx);
424
425 mutex_lock(&local->mtx);
426 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
427 IEEE80211_CHANCTX_EXCLUSIVE);
428 mutex_unlock(&local->mtx);
429 if (ret) {
430 mutex_lock(&local->iflist_mtx);
431 rcu_assign_pointer(local->monitor_sdata, NULL);
432 mutex_unlock(&local->iflist_mtx);
433 synchronize_net();
434 drv_remove_interface(local, sdata);
435 kfree(sdata);
436 return ret;
437 }
438
439 return 0;
440 }
441
442 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
443 {
444 struct ieee80211_sub_if_data *sdata;
445
446 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
447 return;
448
449 ASSERT_RTNL();
450
451 mutex_lock(&local->iflist_mtx);
452
453 sdata = rcu_dereference_protected(local->monitor_sdata,
454 lockdep_is_held(&local->iflist_mtx));
455 if (!sdata) {
456 mutex_unlock(&local->iflist_mtx);
457 return;
458 }
459
460 rcu_assign_pointer(local->monitor_sdata, NULL);
461 mutex_unlock(&local->iflist_mtx);
462
463 synchronize_net();
464
465 mutex_lock(&local->mtx);
466 ieee80211_vif_release_channel(sdata);
467 mutex_unlock(&local->mtx);
468
469 drv_remove_interface(local, sdata);
470
471 kfree(sdata);
472 }
473
474 /*
475 * NOTE: Be very careful when changing this function, it must NOT return
476 * an error on interface type changes that have been pre-checked, so most
477 * checks should be in ieee80211_check_concurrent_iface.
478 */
479 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
480 {
481 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
482 struct net_device *dev = wdev->netdev;
483 struct ieee80211_local *local = sdata->local;
484 struct sta_info *sta;
485 u32 changed = 0;
486 int res;
487 u32 hw_reconf_flags = 0;
488
489 switch (sdata->vif.type) {
490 case NL80211_IFTYPE_WDS:
491 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
492 return -ENOLINK;
493 break;
494 case NL80211_IFTYPE_AP_VLAN: {
495 struct ieee80211_sub_if_data *master;
496
497 if (!sdata->bss)
498 return -ENOLINK;
499
500 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
501
502 master = container_of(sdata->bss,
503 struct ieee80211_sub_if_data, u.ap);
504 sdata->control_port_protocol =
505 master->control_port_protocol;
506 sdata->control_port_no_encrypt =
507 master->control_port_no_encrypt;
508 sdata->vif.cab_queue = master->vif.cab_queue;
509 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
510 sizeof(sdata->vif.hw_queue));
511 break;
512 }
513 case NL80211_IFTYPE_AP:
514 sdata->bss = &sdata->u.ap;
515 break;
516 case NL80211_IFTYPE_MESH_POINT:
517 case NL80211_IFTYPE_STATION:
518 case NL80211_IFTYPE_MONITOR:
519 case NL80211_IFTYPE_ADHOC:
520 case NL80211_IFTYPE_P2P_DEVICE:
521 /* no special treatment */
522 break;
523 case NL80211_IFTYPE_UNSPECIFIED:
524 case NUM_NL80211_IFTYPES:
525 case NL80211_IFTYPE_P2P_CLIENT:
526 case NL80211_IFTYPE_P2P_GO:
527 /* cannot happen */
528 WARN_ON(1);
529 break;
530 }
531
532 if (local->open_count == 0) {
533 res = drv_start(local);
534 if (res)
535 goto err_del_bss;
536 /* we're brought up, everything changes */
537 hw_reconf_flags = ~0;
538 ieee80211_led_radio(local, true);
539 ieee80211_mod_tpt_led_trig(local,
540 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
541 }
542
543 /*
544 * Copy the hopefully now-present MAC address to
545 * this interface, if it has the special null one.
546 */
547 if (dev && is_zero_ether_addr(dev->dev_addr)) {
548 memcpy(dev->dev_addr,
549 local->hw.wiphy->perm_addr,
550 ETH_ALEN);
551 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
552
553 if (!is_valid_ether_addr(dev->dev_addr)) {
554 res = -EADDRNOTAVAIL;
555 goto err_stop;
556 }
557 }
558
559 switch (sdata->vif.type) {
560 case NL80211_IFTYPE_AP_VLAN:
561 /* no need to tell driver, but set carrier and chanctx */
562 if (rtnl_dereference(sdata->bss->beacon)) {
563 ieee80211_vif_vlan_copy_chanctx(sdata);
564 netif_carrier_on(dev);
565 } else {
566 netif_carrier_off(dev);
567 }
568 break;
569 case NL80211_IFTYPE_MONITOR:
570 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
571 local->cooked_mntrs++;
572 break;
573 }
574
575 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
576 res = drv_add_interface(local, sdata);
577 if (res)
578 goto err_stop;
579 } else if (local->monitors == 0 && local->open_count == 0) {
580 res = ieee80211_add_virtual_monitor(local);
581 if (res)
582 goto err_stop;
583 }
584
585 /* must be before the call to ieee80211_configure_filter */
586 local->monitors++;
587 if (local->monitors == 1) {
588 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
589 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
590 }
591
592 ieee80211_adjust_monitor_flags(sdata, 1);
593 ieee80211_configure_filter(local);
594 mutex_lock(&local->mtx);
595 ieee80211_recalc_idle(local);
596 mutex_unlock(&local->mtx);
597
598 netif_carrier_on(dev);
599 break;
600 default:
601 if (coming_up) {
602 ieee80211_del_virtual_monitor(local);
603
604 res = drv_add_interface(local, sdata);
605 if (res)
606 goto err_stop;
607 res = ieee80211_check_queues(sdata,
608 ieee80211_vif_type_p2p(&sdata->vif));
609 if (res)
610 goto err_del_interface;
611 }
612
613 if (sdata->vif.type == NL80211_IFTYPE_AP) {
614 local->fif_pspoll++;
615 local->fif_probe_req++;
616
617 ieee80211_configure_filter(local);
618 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
619 local->fif_probe_req++;
620 }
621
622 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
623 changed |= ieee80211_reset_erp_info(sdata);
624 ieee80211_bss_info_change_notify(sdata, changed);
625
626 switch (sdata->vif.type) {
627 case NL80211_IFTYPE_STATION:
628 case NL80211_IFTYPE_ADHOC:
629 case NL80211_IFTYPE_AP:
630 case NL80211_IFTYPE_MESH_POINT:
631 netif_carrier_off(dev);
632 break;
633 case NL80211_IFTYPE_WDS:
634 case NL80211_IFTYPE_P2P_DEVICE:
635 break;
636 default:
637 /* not reached */
638 WARN_ON(1);
639 }
640
641 /*
642 * set default queue parameters so drivers don't
643 * need to initialise the hardware if the hardware
644 * doesn't start up with sane defaults
645 */
646 ieee80211_set_wmm_default(sdata, true);
647 }
648
649 set_bit(SDATA_STATE_RUNNING, &sdata->state);
650
651 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
652 /* Create STA entry for the WDS peer */
653 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
654 GFP_KERNEL);
655 if (!sta) {
656 res = -ENOMEM;
657 goto err_del_interface;
658 }
659
660 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
661 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
662 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
663
664 res = sta_info_insert(sta);
665 if (res) {
666 /* STA has been freed */
667 goto err_del_interface;
668 }
669
670 rate_control_rate_init(sta);
671 netif_carrier_on(dev);
672 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
673 rcu_assign_pointer(local->p2p_sdata, sdata);
674 }
675
676 /*
677 * set_multicast_list will be invoked by the networking core
678 * which will check whether any increments here were done in
679 * error and sync them down to the hardware as filter flags.
680 */
681 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
682 atomic_inc(&local->iff_allmultis);
683
684 if (sdata->flags & IEEE80211_SDATA_PROMISC)
685 atomic_inc(&local->iff_promiscs);
686
687 if (coming_up)
688 local->open_count++;
689
690 if (hw_reconf_flags)
691 ieee80211_hw_config(local, hw_reconf_flags);
692
693 ieee80211_recalc_ps(local, -1);
694
695 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
696 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
697 /* XXX: for AP_VLAN, actually track AP queues */
698 netif_tx_start_all_queues(dev);
699 } else if (dev) {
700 unsigned long flags;
701 int n_acs = IEEE80211_NUM_ACS;
702 int ac;
703
704 if (local->hw.queues < IEEE80211_NUM_ACS)
705 n_acs = 1;
706
707 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
708 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
709 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
710 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
711 for (ac = 0; ac < n_acs; ac++) {
712 int ac_queue = sdata->vif.hw_queue[ac];
713
714 if (local->queue_stop_reasons[ac_queue] == 0 &&
715 skb_queue_empty(&local->pending[ac_queue]))
716 netif_start_subqueue(dev, ac);
717 }
718 }
719 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
720 }
721
722 return 0;
723 err_del_interface:
724 drv_remove_interface(local, sdata);
725 err_stop:
726 if (!local->open_count)
727 drv_stop(local);
728 err_del_bss:
729 sdata->bss = NULL;
730 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
731 list_del(&sdata->u.vlan.list);
732 /* might already be clear but that doesn't matter */
733 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
734 return res;
735 }
736
737 static int ieee80211_open(struct net_device *dev)
738 {
739 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
740 int err;
741
742 /* fail early if user set an invalid address */
743 if (!is_valid_ether_addr(dev->dev_addr))
744 return -EADDRNOTAVAIL;
745
746 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
747 if (err)
748 return err;
749
750 return ieee80211_do_open(&sdata->wdev, true);
751 }
752
753 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
754 bool going_down)
755 {
756 struct ieee80211_local *local = sdata->local;
757 unsigned long flags;
758 struct sk_buff *skb, *tmp;
759 u32 hw_reconf_flags = 0;
760 int i, flushed;
761 struct ps_data *ps;
762 struct cfg80211_chan_def chandef;
763
764 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
765
766 if (rcu_access_pointer(local->scan_sdata) == sdata)
767 ieee80211_scan_cancel(local);
768
769 /*
770 * Stop TX on this interface first.
771 */
772 if (sdata->dev)
773 netif_tx_stop_all_queues(sdata->dev);
774
775 ieee80211_roc_purge(local, sdata);
776
777 switch (sdata->vif.type) {
778 case NL80211_IFTYPE_STATION:
779 ieee80211_mgd_stop(sdata);
780 break;
781 case NL80211_IFTYPE_ADHOC:
782 ieee80211_ibss_stop(sdata);
783 break;
784 case NL80211_IFTYPE_AP:
785 cancel_work_sync(&sdata->u.ap.request_smps_work);
786 break;
787 default:
788 break;
789 }
790
791 /*
792 * Remove all stations associated with this interface.
793 *
794 * This must be done before calling ops->remove_interface()
795 * because otherwise we can later invoke ops->sta_notify()
796 * whenever the STAs are removed, and that invalidates driver
797 * assumptions about always getting a vif pointer that is valid
798 * (because if we remove a STA after ops->remove_interface()
799 * the driver will have removed the vif info already!)
800 *
801 * This is relevant only in WDS mode, in all other modes we've
802 * already removed all stations when disconnecting or similar,
803 * so warn otherwise.
804 */
805 flushed = sta_info_flush(sdata);
806 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
807 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
808
809 /* don't count this interface for promisc/allmulti while it is down */
810 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
811 atomic_dec(&local->iff_allmultis);
812
813 if (sdata->flags & IEEE80211_SDATA_PROMISC)
814 atomic_dec(&local->iff_promiscs);
815
816 if (sdata->vif.type == NL80211_IFTYPE_AP) {
817 local->fif_pspoll--;
818 local->fif_probe_req--;
819 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
820 local->fif_probe_req--;
821 }
822
823 if (sdata->dev) {
824 netif_addr_lock_bh(sdata->dev);
825 spin_lock_bh(&local->filter_lock);
826 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
827 sdata->dev->addr_len);
828 spin_unlock_bh(&local->filter_lock);
829 netif_addr_unlock_bh(sdata->dev);
830 }
831
832 del_timer_sync(&local->dynamic_ps_timer);
833 cancel_work_sync(&local->dynamic_ps_enable_work);
834
835 cancel_work_sync(&sdata->recalc_smps);
836 sdata->vif.csa_active = false;
837 cancel_work_sync(&sdata->csa_finalize_work);
838
839 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
840
841 if (sdata->wdev.cac_started) {
842 chandef = sdata->vif.bss_conf.chandef;
843 WARN_ON(local->suspended);
844 mutex_lock(&local->mtx);
845 ieee80211_vif_release_channel(sdata);
846 mutex_unlock(&local->mtx);
847 cfg80211_cac_event(sdata->dev, &chandef,
848 NL80211_RADAR_CAC_ABORTED,
849 GFP_KERNEL);
850 }
851
852 /* APs need special treatment */
853 if (sdata->vif.type == NL80211_IFTYPE_AP) {
854 struct ieee80211_sub_if_data *vlan, *tmpsdata;
855
856 /* down all dependent devices, that is VLANs */
857 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
858 u.vlan.list)
859 dev_close(vlan->dev);
860 WARN_ON(!list_empty(&sdata->u.ap.vlans));
861 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
862 /* remove all packets in parent bc_buf pointing to this dev */
863 ps = &sdata->bss->ps;
864
865 spin_lock_irqsave(&ps->bc_buf.lock, flags);
866 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
867 if (skb->dev == sdata->dev) {
868 __skb_unlink(skb, &ps->bc_buf);
869 local->total_ps_buffered--;
870 ieee80211_free_txskb(&local->hw, skb);
871 }
872 }
873 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
874 }
875
876 if (going_down)
877 local->open_count--;
878
879 switch (sdata->vif.type) {
880 case NL80211_IFTYPE_AP_VLAN:
881 list_del(&sdata->u.vlan.list);
882 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
883 /* no need to tell driver */
884 break;
885 case NL80211_IFTYPE_MONITOR:
886 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
887 local->cooked_mntrs--;
888 break;
889 }
890
891 local->monitors--;
892 if (local->monitors == 0) {
893 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
894 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
895 }
896
897 ieee80211_adjust_monitor_flags(sdata, -1);
898 break;
899 case NL80211_IFTYPE_P2P_DEVICE:
900 /* relies on synchronize_rcu() below */
901 rcu_assign_pointer(local->p2p_sdata, NULL);
902 /* fall through */
903 default:
904 cancel_work_sync(&sdata->work);
905 /*
906 * When we get here, the interface is marked down.
907 * Free the remaining keys, if there are any
908 * (shouldn't be, except maybe in WDS mode?)
909 *
910 * Force the key freeing to always synchronize_net()
911 * to wait for the RX path in case it is using this
912 * interface enqueuing frames * at this very time on
913 * another CPU.
914 */
915 ieee80211_free_keys(sdata, true);
916
917 /* fall through */
918 case NL80211_IFTYPE_AP:
919 skb_queue_purge(&sdata->skb_queue);
920 }
921
922 sdata->bss = NULL;
923
924 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
925 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
926 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
927 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
928 if (info->control.vif == &sdata->vif) {
929 __skb_unlink(skb, &local->pending[i]);
930 ieee80211_free_txskb(&local->hw, skb);
931 }
932 }
933 }
934 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
935
936 if (local->open_count == 0)
937 ieee80211_clear_tx_pending(local);
938
939 /*
940 * If the interface goes down while suspended, presumably because
941 * the device was unplugged and that happens before our resume,
942 * then the driver is already unconfigured and the remainder of
943 * this function isn't needed.
944 * XXX: what about WoWLAN? If the device has software state, e.g.
945 * memory allocated, it might expect teardown commands from
946 * mac80211 here?
947 */
948 if (local->suspended) {
949 WARN_ON(local->wowlan);
950 WARN_ON(rtnl_dereference(local->monitor_sdata));
951 return;
952 }
953
954 switch (sdata->vif.type) {
955 case NL80211_IFTYPE_AP_VLAN:
956 break;
957 case NL80211_IFTYPE_MONITOR:
958 if (local->monitors == 0)
959 ieee80211_del_virtual_monitor(local);
960
961 mutex_lock(&local->mtx);
962 ieee80211_recalc_idle(local);
963 mutex_unlock(&local->mtx);
964
965 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
966 break;
967
968 /* fall through */
969 default:
970 if (going_down)
971 drv_remove_interface(local, sdata);
972 }
973
974 ieee80211_recalc_ps(local, -1);
975
976 if (local->open_count == 0) {
977 ieee80211_stop_device(local);
978
979 /* no reconfiguring after stop! */
980 return;
981 }
982
983 /* do after stop to avoid reconfiguring when we stop anyway */
984 ieee80211_configure_filter(local);
985 ieee80211_hw_config(local, hw_reconf_flags);
986
987 if (local->monitors == local->open_count)
988 ieee80211_add_virtual_monitor(local);
989 }
990
991 static int ieee80211_stop(struct net_device *dev)
992 {
993 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
994
995 ieee80211_do_stop(sdata, true);
996
997 return 0;
998 }
999
1000 static void ieee80211_set_multicast_list(struct net_device *dev)
1001 {
1002 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1003 struct ieee80211_local *local = sdata->local;
1004 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1005
1006 allmulti = !!(dev->flags & IFF_ALLMULTI);
1007 promisc = !!(dev->flags & IFF_PROMISC);
1008 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1009 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1010
1011 if (allmulti != sdata_allmulti) {
1012 if (dev->flags & IFF_ALLMULTI)
1013 atomic_inc(&local->iff_allmultis);
1014 else
1015 atomic_dec(&local->iff_allmultis);
1016 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1017 }
1018
1019 if (promisc != sdata_promisc) {
1020 if (dev->flags & IFF_PROMISC)
1021 atomic_inc(&local->iff_promiscs);
1022 else
1023 atomic_dec(&local->iff_promiscs);
1024 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1025 }
1026 spin_lock_bh(&local->filter_lock);
1027 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1028 spin_unlock_bh(&local->filter_lock);
1029 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1030 }
1031
1032 /*
1033 * Called when the netdev is removed or, by the code below, before
1034 * the interface type changes.
1035 */
1036 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1037 {
1038 int i;
1039
1040 /* free extra data */
1041 ieee80211_free_keys(sdata, false);
1042
1043 ieee80211_debugfs_remove_netdev(sdata);
1044
1045 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1046 __skb_queue_purge(&sdata->fragments[i].skb_list);
1047 sdata->fragment_next = 0;
1048
1049 if (ieee80211_vif_is_mesh(&sdata->vif))
1050 mesh_rmc_free(sdata);
1051 }
1052
1053 static void ieee80211_uninit(struct net_device *dev)
1054 {
1055 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1056 }
1057
1058 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1059 struct sk_buff *skb,
1060 void *accel_priv,
1061 select_queue_fallback_t fallback)
1062 {
1063 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1064 }
1065
1066 static const struct net_device_ops ieee80211_dataif_ops = {
1067 .ndo_open = ieee80211_open,
1068 .ndo_stop = ieee80211_stop,
1069 .ndo_uninit = ieee80211_uninit,
1070 .ndo_start_xmit = ieee80211_subif_start_xmit,
1071 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1072 .ndo_change_mtu = ieee80211_change_mtu,
1073 .ndo_set_mac_address = ieee80211_change_mac,
1074 .ndo_select_queue = ieee80211_netdev_select_queue,
1075 };
1076
1077 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1078 struct sk_buff *skb,
1079 void *accel_priv,
1080 select_queue_fallback_t fallback)
1081 {
1082 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1083 struct ieee80211_local *local = sdata->local;
1084 struct ieee80211_hdr *hdr;
1085 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1086
1087 if (local->hw.queues < IEEE80211_NUM_ACS)
1088 return 0;
1089
1090 if (skb->len < 4 ||
1091 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1092 return 0; /* doesn't matter, frame will be dropped */
1093
1094 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1095
1096 return ieee80211_select_queue_80211(sdata, skb, hdr);
1097 }
1098
1099 static const struct net_device_ops ieee80211_monitorif_ops = {
1100 .ndo_open = ieee80211_open,
1101 .ndo_stop = ieee80211_stop,
1102 .ndo_uninit = ieee80211_uninit,
1103 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1104 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1105 .ndo_change_mtu = ieee80211_change_mtu,
1106 .ndo_set_mac_address = ieee80211_change_mac,
1107 .ndo_select_queue = ieee80211_monitor_select_queue,
1108 };
1109
1110 static void ieee80211_if_setup(struct net_device *dev)
1111 {
1112 ether_setup(dev);
1113 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1114 dev->netdev_ops = &ieee80211_dataif_ops;
1115 dev->destructor = free_netdev;
1116 }
1117
1118 static void ieee80211_iface_work(struct work_struct *work)
1119 {
1120 struct ieee80211_sub_if_data *sdata =
1121 container_of(work, struct ieee80211_sub_if_data, work);
1122 struct ieee80211_local *local = sdata->local;
1123 struct sk_buff *skb;
1124 struct sta_info *sta;
1125 struct ieee80211_ra_tid *ra_tid;
1126
1127 if (!ieee80211_sdata_running(sdata))
1128 return;
1129
1130 if (local->scanning)
1131 return;
1132
1133 /*
1134 * ieee80211_queue_work() should have picked up most cases,
1135 * here we'll pick the rest.
1136 */
1137 if (WARN(local->suspended,
1138 "interface work scheduled while going to suspend\n"))
1139 return;
1140
1141 /* first process frames */
1142 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1143 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1144
1145 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1146 ra_tid = (void *)&skb->cb;
1147 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1148 ra_tid->tid);
1149 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1150 ra_tid = (void *)&skb->cb;
1151 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1152 ra_tid->tid);
1153 } else if (ieee80211_is_action(mgmt->frame_control) &&
1154 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1155 int len = skb->len;
1156
1157 mutex_lock(&local->sta_mtx);
1158 sta = sta_info_get_bss(sdata, mgmt->sa);
1159 if (sta) {
1160 switch (mgmt->u.action.u.addba_req.action_code) {
1161 case WLAN_ACTION_ADDBA_REQ:
1162 ieee80211_process_addba_request(
1163 local, sta, mgmt, len);
1164 break;
1165 case WLAN_ACTION_ADDBA_RESP:
1166 ieee80211_process_addba_resp(local, sta,
1167 mgmt, len);
1168 break;
1169 case WLAN_ACTION_DELBA:
1170 ieee80211_process_delba(sdata, sta,
1171 mgmt, len);
1172 break;
1173 default:
1174 WARN_ON(1);
1175 break;
1176 }
1177 }
1178 mutex_unlock(&local->sta_mtx);
1179 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1180 struct ieee80211_hdr *hdr = (void *)mgmt;
1181 /*
1182 * So the frame isn't mgmt, but frame_control
1183 * is at the right place anyway, of course, so
1184 * the if statement is correct.
1185 *
1186 * Warn if we have other data frame types here,
1187 * they must not get here.
1188 */
1189 WARN_ON(hdr->frame_control &
1190 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1191 WARN_ON(!(hdr->seq_ctrl &
1192 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1193 /*
1194 * This was a fragment of a frame, received while
1195 * a block-ack session was active. That cannot be
1196 * right, so terminate the session.
1197 */
1198 mutex_lock(&local->sta_mtx);
1199 sta = sta_info_get_bss(sdata, mgmt->sa);
1200 if (sta) {
1201 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1202 IEEE80211_QOS_CTL_TID_MASK;
1203
1204 __ieee80211_stop_rx_ba_session(
1205 sta, tid, WLAN_BACK_RECIPIENT,
1206 WLAN_REASON_QSTA_REQUIRE_SETUP,
1207 true);
1208 }
1209 mutex_unlock(&local->sta_mtx);
1210 } else switch (sdata->vif.type) {
1211 case NL80211_IFTYPE_STATION:
1212 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1213 break;
1214 case NL80211_IFTYPE_ADHOC:
1215 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1216 break;
1217 case NL80211_IFTYPE_MESH_POINT:
1218 if (!ieee80211_vif_is_mesh(&sdata->vif))
1219 break;
1220 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1221 break;
1222 default:
1223 WARN(1, "frame for unexpected interface type");
1224 break;
1225 }
1226
1227 kfree_skb(skb);
1228 }
1229
1230 /* then other type-dependent work */
1231 switch (sdata->vif.type) {
1232 case NL80211_IFTYPE_STATION:
1233 ieee80211_sta_work(sdata);
1234 break;
1235 case NL80211_IFTYPE_ADHOC:
1236 ieee80211_ibss_work(sdata);
1237 break;
1238 case NL80211_IFTYPE_MESH_POINT:
1239 if (!ieee80211_vif_is_mesh(&sdata->vif))
1240 break;
1241 ieee80211_mesh_work(sdata);
1242 break;
1243 default:
1244 break;
1245 }
1246 }
1247
1248 static void ieee80211_recalc_smps_work(struct work_struct *work)
1249 {
1250 struct ieee80211_sub_if_data *sdata =
1251 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1252
1253 ieee80211_recalc_smps(sdata);
1254 }
1255
1256 /*
1257 * Helper function to initialise an interface to a specific type.
1258 */
1259 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1260 enum nl80211_iftype type)
1261 {
1262 /* clear type-dependent union */
1263 memset(&sdata->u, 0, sizeof(sdata->u));
1264
1265 /* and set some type-dependent values */
1266 sdata->vif.type = type;
1267 sdata->vif.p2p = false;
1268 sdata->wdev.iftype = type;
1269
1270 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1271 sdata->control_port_no_encrypt = false;
1272 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1273
1274 sdata->noack_map = 0;
1275
1276 /* only monitor/p2p-device differ */
1277 if (sdata->dev) {
1278 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1279 sdata->dev->type = ARPHRD_ETHER;
1280 }
1281
1282 skb_queue_head_init(&sdata->skb_queue);
1283 INIT_WORK(&sdata->work, ieee80211_iface_work);
1284 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1285 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1286
1287 switch (type) {
1288 case NL80211_IFTYPE_P2P_GO:
1289 type = NL80211_IFTYPE_AP;
1290 sdata->vif.type = type;
1291 sdata->vif.p2p = true;
1292 /* fall through */
1293 case NL80211_IFTYPE_AP:
1294 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1295 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1296 INIT_WORK(&sdata->u.ap.request_smps_work,
1297 ieee80211_request_smps_ap_work);
1298 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1299 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1300 break;
1301 case NL80211_IFTYPE_P2P_CLIENT:
1302 type = NL80211_IFTYPE_STATION;
1303 sdata->vif.type = type;
1304 sdata->vif.p2p = true;
1305 /* fall through */
1306 case NL80211_IFTYPE_STATION:
1307 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1308 ieee80211_sta_setup_sdata(sdata);
1309 break;
1310 case NL80211_IFTYPE_ADHOC:
1311 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1312 ieee80211_ibss_setup_sdata(sdata);
1313 break;
1314 case NL80211_IFTYPE_MESH_POINT:
1315 if (ieee80211_vif_is_mesh(&sdata->vif))
1316 ieee80211_mesh_init_sdata(sdata);
1317 break;
1318 case NL80211_IFTYPE_MONITOR:
1319 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1320 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1321 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1322 MONITOR_FLAG_OTHER_BSS;
1323 break;
1324 case NL80211_IFTYPE_WDS:
1325 sdata->vif.bss_conf.bssid = NULL;
1326 break;
1327 case NL80211_IFTYPE_AP_VLAN:
1328 case NL80211_IFTYPE_P2P_DEVICE:
1329 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1330 break;
1331 case NL80211_IFTYPE_UNSPECIFIED:
1332 case NUM_NL80211_IFTYPES:
1333 BUG();
1334 break;
1335 }
1336
1337 ieee80211_debugfs_add_netdev(sdata);
1338 }
1339
1340 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1341 enum nl80211_iftype type)
1342 {
1343 struct ieee80211_local *local = sdata->local;
1344 int ret, err;
1345 enum nl80211_iftype internal_type = type;
1346 bool p2p = false;
1347
1348 ASSERT_RTNL();
1349
1350 if (!local->ops->change_interface)
1351 return -EBUSY;
1352
1353 switch (sdata->vif.type) {
1354 case NL80211_IFTYPE_AP:
1355 case NL80211_IFTYPE_STATION:
1356 case NL80211_IFTYPE_ADHOC:
1357 /*
1358 * Could maybe also all others here?
1359 * Just not sure how that interacts
1360 * with the RX/config path e.g. for
1361 * mesh.
1362 */
1363 break;
1364 default:
1365 return -EBUSY;
1366 }
1367
1368 switch (type) {
1369 case NL80211_IFTYPE_AP:
1370 case NL80211_IFTYPE_STATION:
1371 case NL80211_IFTYPE_ADHOC:
1372 /*
1373 * Could probably support everything
1374 * but WDS here (WDS do_open can fail
1375 * under memory pressure, which this
1376 * code isn't prepared to handle).
1377 */
1378 break;
1379 case NL80211_IFTYPE_P2P_CLIENT:
1380 p2p = true;
1381 internal_type = NL80211_IFTYPE_STATION;
1382 break;
1383 case NL80211_IFTYPE_P2P_GO:
1384 p2p = true;
1385 internal_type = NL80211_IFTYPE_AP;
1386 break;
1387 default:
1388 return -EBUSY;
1389 }
1390
1391 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1392 if (ret)
1393 return ret;
1394
1395 ieee80211_do_stop(sdata, false);
1396
1397 ieee80211_teardown_sdata(sdata);
1398
1399 ret = drv_change_interface(local, sdata, internal_type, p2p);
1400 if (ret)
1401 type = ieee80211_vif_type_p2p(&sdata->vif);
1402
1403 /*
1404 * Ignore return value here, there's not much we can do since
1405 * the driver changed the interface type internally already.
1406 * The warnings will hopefully make driver authors fix it :-)
1407 */
1408 ieee80211_check_queues(sdata, type);
1409
1410 ieee80211_setup_sdata(sdata, type);
1411
1412 err = ieee80211_do_open(&sdata->wdev, false);
1413 WARN(err, "type change: do_open returned %d", err);
1414
1415 return ret;
1416 }
1417
1418 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1419 enum nl80211_iftype type)
1420 {
1421 int ret;
1422
1423 ASSERT_RTNL();
1424
1425 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1426 return 0;
1427
1428 if (ieee80211_sdata_running(sdata)) {
1429 ret = ieee80211_runtime_change_iftype(sdata, type);
1430 if (ret)
1431 return ret;
1432 } else {
1433 /* Purge and reset type-dependent state. */
1434 ieee80211_teardown_sdata(sdata);
1435 ieee80211_setup_sdata(sdata, type);
1436 }
1437
1438 /* reset some values that shouldn't be kept across type changes */
1439 sdata->drop_unencrypted = 0;
1440 if (type == NL80211_IFTYPE_STATION)
1441 sdata->u.mgd.use_4addr = false;
1442
1443 return 0;
1444 }
1445
1446 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1447 u8 *perm_addr, enum nl80211_iftype type)
1448 {
1449 struct ieee80211_sub_if_data *sdata;
1450 u64 mask, start, addr, val, inc;
1451 u8 *m;
1452 u8 tmp_addr[ETH_ALEN];
1453 int i;
1454
1455 /* default ... something at least */
1456 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1457
1458 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1459 local->hw.wiphy->n_addresses <= 1)
1460 return;
1461
1462 mutex_lock(&local->iflist_mtx);
1463
1464 switch (type) {
1465 case NL80211_IFTYPE_MONITOR:
1466 /* doesn't matter */
1467 break;
1468 case NL80211_IFTYPE_WDS:
1469 case NL80211_IFTYPE_AP_VLAN:
1470 /* match up with an AP interface */
1471 list_for_each_entry(sdata, &local->interfaces, list) {
1472 if (sdata->vif.type != NL80211_IFTYPE_AP)
1473 continue;
1474 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1475 break;
1476 }
1477 /* keep default if no AP interface present */
1478 break;
1479 case NL80211_IFTYPE_P2P_CLIENT:
1480 case NL80211_IFTYPE_P2P_GO:
1481 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1482 list_for_each_entry(sdata, &local->interfaces, list) {
1483 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1484 continue;
1485 if (!ieee80211_sdata_running(sdata))
1486 continue;
1487 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1488 goto out_unlock;
1489 }
1490 }
1491 /* otherwise fall through */
1492 default:
1493 /* assign a new address if possible -- try n_addresses first */
1494 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1495 bool used = false;
1496
1497 list_for_each_entry(sdata, &local->interfaces, list) {
1498 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1499 sdata->vif.addr)) {
1500 used = true;
1501 break;
1502 }
1503 }
1504
1505 if (!used) {
1506 memcpy(perm_addr,
1507 local->hw.wiphy->addresses[i].addr,
1508 ETH_ALEN);
1509 break;
1510 }
1511 }
1512
1513 /* try mask if available */
1514 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1515 break;
1516
1517 m = local->hw.wiphy->addr_mask;
1518 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1519 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1520 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1521
1522 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1523 /* not a contiguous mask ... not handled now! */
1524 pr_info("not contiguous\n");
1525 break;
1526 }
1527
1528 /*
1529 * Pick address of existing interface in case user changed
1530 * MAC address manually, default to perm_addr.
1531 */
1532 m = local->hw.wiphy->perm_addr;
1533 list_for_each_entry(sdata, &local->interfaces, list) {
1534 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1535 continue;
1536 m = sdata->vif.addr;
1537 break;
1538 }
1539 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1540 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1541 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1542
1543 inc = 1ULL<<__ffs64(mask);
1544 val = (start & mask);
1545 addr = (start & ~mask) | (val & mask);
1546 do {
1547 bool used = false;
1548
1549 tmp_addr[5] = addr >> 0*8;
1550 tmp_addr[4] = addr >> 1*8;
1551 tmp_addr[3] = addr >> 2*8;
1552 tmp_addr[2] = addr >> 3*8;
1553 tmp_addr[1] = addr >> 4*8;
1554 tmp_addr[0] = addr >> 5*8;
1555
1556 val += inc;
1557
1558 list_for_each_entry(sdata, &local->interfaces, list) {
1559 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1560 used = true;
1561 break;
1562 }
1563 }
1564
1565 if (!used) {
1566 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1567 break;
1568 }
1569 addr = (start & ~mask) | (val & mask);
1570 } while (addr != start);
1571
1572 break;
1573 }
1574
1575 out_unlock:
1576 mutex_unlock(&local->iflist_mtx);
1577 }
1578
1579 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1580 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1581 struct vif_params *params)
1582 {
1583 struct net_device *ndev = NULL;
1584 struct ieee80211_sub_if_data *sdata = NULL;
1585 int ret, i;
1586 int txqs = 1;
1587
1588 ASSERT_RTNL();
1589
1590 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1591 struct wireless_dev *wdev;
1592
1593 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1594 GFP_KERNEL);
1595 if (!sdata)
1596 return -ENOMEM;
1597 wdev = &sdata->wdev;
1598
1599 sdata->dev = NULL;
1600 strlcpy(sdata->name, name, IFNAMSIZ);
1601 ieee80211_assign_perm_addr(local, wdev->address, type);
1602 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1603 } else {
1604 if (local->hw.queues >= IEEE80211_NUM_ACS)
1605 txqs = IEEE80211_NUM_ACS;
1606
1607 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1608 local->hw.vif_data_size,
1609 name, ieee80211_if_setup, txqs, 1);
1610 if (!ndev)
1611 return -ENOMEM;
1612 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1613
1614 ndev->needed_headroom = local->tx_headroom +
1615 4*6 /* four MAC addresses */
1616 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1617 + 6 /* mesh */
1618 + 8 /* rfc1042/bridge tunnel */
1619 - ETH_HLEN /* ethernet hard_header_len */
1620 + IEEE80211_ENCRYPT_HEADROOM;
1621 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1622
1623 ret = dev_alloc_name(ndev, ndev->name);
1624 if (ret < 0) {
1625 free_netdev(ndev);
1626 return ret;
1627 }
1628
1629 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1630 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1631 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1632
1633 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1634 sdata = netdev_priv(ndev);
1635 ndev->ieee80211_ptr = &sdata->wdev;
1636 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1637 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1638
1639 sdata->dev = ndev;
1640 }
1641
1642 /* initialise type-independent data */
1643 sdata->wdev.wiphy = local->hw.wiphy;
1644 sdata->local = local;
1645
1646 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1647 skb_queue_head_init(&sdata->fragments[i].skb_list);
1648
1649 INIT_LIST_HEAD(&sdata->key_list);
1650
1651 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1652 ieee80211_dfs_cac_timer_work);
1653 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1654 ieee80211_delayed_tailroom_dec);
1655
1656 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1657 struct ieee80211_supported_band *sband;
1658 sband = local->hw.wiphy->bands[i];
1659 sdata->rc_rateidx_mask[i] =
1660 sband ? (1 << sband->n_bitrates) - 1 : 0;
1661 if (sband)
1662 memcpy(sdata->rc_rateidx_mcs_mask[i],
1663 sband->ht_cap.mcs.rx_mask,
1664 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1665 else
1666 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1667 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1668 }
1669
1670 ieee80211_set_default_queues(sdata);
1671
1672 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1673 sdata->user_power_level = local->user_power_level;
1674
1675 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1676
1677 /* setup type-dependent data */
1678 ieee80211_setup_sdata(sdata, type);
1679
1680 if (ndev) {
1681 if (params) {
1682 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1683 if (type == NL80211_IFTYPE_STATION)
1684 sdata->u.mgd.use_4addr = params->use_4addr;
1685 }
1686
1687 ndev->features |= local->hw.netdev_features;
1688
1689 ret = register_netdevice(ndev);
1690 if (ret) {
1691 free_netdev(ndev);
1692 return ret;
1693 }
1694 }
1695
1696 mutex_lock(&local->iflist_mtx);
1697 list_add_tail_rcu(&sdata->list, &local->interfaces);
1698 mutex_unlock(&local->iflist_mtx);
1699
1700 if (new_wdev)
1701 *new_wdev = &sdata->wdev;
1702
1703 return 0;
1704 }
1705
1706 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1707 {
1708 ASSERT_RTNL();
1709
1710 mutex_lock(&sdata->local->iflist_mtx);
1711 list_del_rcu(&sdata->list);
1712 mutex_unlock(&sdata->local->iflist_mtx);
1713
1714 synchronize_rcu();
1715
1716 if (sdata->dev) {
1717 unregister_netdevice(sdata->dev);
1718 } else {
1719 cfg80211_unregister_wdev(&sdata->wdev);
1720 kfree(sdata);
1721 }
1722 }
1723
1724 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1725 {
1726 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1727 return;
1728 ieee80211_do_stop(sdata, true);
1729 ieee80211_teardown_sdata(sdata);
1730 }
1731
1732 /*
1733 * Remove all interfaces, may only be called at hardware unregistration
1734 * time because it doesn't do RCU-safe list removals.
1735 */
1736 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1737 {
1738 struct ieee80211_sub_if_data *sdata, *tmp;
1739 LIST_HEAD(unreg_list);
1740 LIST_HEAD(wdev_list);
1741
1742 ASSERT_RTNL();
1743
1744 /*
1745 * Close all AP_VLAN interfaces first, as otherwise they
1746 * might be closed while the AP interface they belong to
1747 * is closed, causing unregister_netdevice_many() to crash.
1748 */
1749 list_for_each_entry(sdata, &local->interfaces, list)
1750 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1751 dev_close(sdata->dev);
1752
1753 mutex_lock(&local->iflist_mtx);
1754 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1755 list_del(&sdata->list);
1756
1757 if (sdata->dev)
1758 unregister_netdevice_queue(sdata->dev, &unreg_list);
1759 else
1760 list_add(&sdata->list, &wdev_list);
1761 }
1762 mutex_unlock(&local->iflist_mtx);
1763 unregister_netdevice_many(&unreg_list);
1764 list_del(&unreg_list);
1765
1766 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1767 list_del(&sdata->list);
1768 cfg80211_unregister_wdev(&sdata->wdev);
1769 kfree(sdata);
1770 }
1771 }
1772
1773 static int netdev_notify(struct notifier_block *nb,
1774 unsigned long state, void *ptr)
1775 {
1776 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1777 struct ieee80211_sub_if_data *sdata;
1778
1779 if (state != NETDEV_CHANGENAME)
1780 return 0;
1781
1782 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1783 return 0;
1784
1785 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1786 return 0;
1787
1788 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1789
1790 memcpy(sdata->name, dev->name, IFNAMSIZ);
1791
1792 ieee80211_debugfs_rename_netdev(sdata);
1793 return 0;
1794 }
1795
1796 static struct notifier_block mac80211_netdev_notifier = {
1797 .notifier_call = netdev_notify,
1798 };
1799
1800 int ieee80211_iface_init(void)
1801 {
1802 return register_netdevice_notifier(&mac80211_netdev_notifier);
1803 }
1804
1805 void ieee80211_iface_exit(void)
1806 {
1807 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1808 }
Linux kernel - Deliverables
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