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mac80211: fix virtual monitor interface addition
[deliverable/linux.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 int power;
49
50 rcu_read_lock();
51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 if (!chanctx_conf) {
53 rcu_read_unlock();
54 return false;
55 }
56
57 power = ieee80211_chandef_max_power(&chanctx_conf->def);
58 rcu_read_unlock();
59
60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 power = min(power, sdata->user_power_level);
62
63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->ap_power_level);
65
66 if (power != sdata->vif.bss_conf.txpower) {
67 sdata->vif.bss_conf.txpower = power;
68 ieee80211_hw_config(sdata->local, 0);
69 return true;
70 }
71
72 return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 if (__ieee80211_recalc_txpower(sdata))
78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
82 {
83 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84 return 0;
85
86 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87 return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
91 {
92 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93 return 0;
94
95 ieee80211_flush_queues(local, NULL);
96
97 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102 bool force_active)
103 {
104 bool working, scanning, active;
105 unsigned int led_trig_start = 0, led_trig_stop = 0;
106
107 lockdep_assert_held(&local->mtx);
108
109 active = force_active ||
110 !list_empty(&local->chanctx_list) ||
111 local->monitors;
112
113 working = !local->ops->remain_on_channel &&
114 !list_empty(&local->roc_list);
115
116 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
117 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
118
119 if (working || scanning)
120 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
121 else
122 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
123
124 if (active)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
128
129 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
130
131 if (working || scanning || active)
132 return __ieee80211_idle_off(local);
133 return __ieee80211_idle_on(local);
134 }
135
136 u32 ieee80211_idle_off(struct ieee80211_local *local)
137 {
138 return __ieee80211_recalc_idle(local, true);
139 }
140
141 void ieee80211_recalc_idle(struct ieee80211_local *local)
142 {
143 u32 change = __ieee80211_recalc_idle(local, false);
144 if (change)
145 ieee80211_hw_config(local, change);
146 }
147
148 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
149 {
150 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
151 return -EINVAL;
152
153 dev->mtu = new_mtu;
154 return 0;
155 }
156
157 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
158 bool check_dup)
159 {
160 struct ieee80211_local *local = sdata->local;
161 struct ieee80211_sub_if_data *iter;
162 u64 new, mask, tmp;
163 u8 *m;
164 int ret = 0;
165
166 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
167 return 0;
168
169 m = addr;
170 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
171 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
172 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
173
174 m = local->hw.wiphy->addr_mask;
175 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178
179 if (!check_dup)
180 return ret;
181
182 mutex_lock(&local->iflist_mtx);
183 list_for_each_entry(iter, &local->interfaces, list) {
184 if (iter == sdata)
185 continue;
186
187 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
188 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
189 continue;
190
191 m = iter->vif.addr;
192 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
193 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
194 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
195
196 if ((new & ~mask) != (tmp & ~mask)) {
197 ret = -EINVAL;
198 break;
199 }
200 }
201 mutex_unlock(&local->iflist_mtx);
202
203 return ret;
204 }
205
206 static int ieee80211_change_mac(struct net_device *dev, void *addr)
207 {
208 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
209 struct sockaddr *sa = addr;
210 bool check_dup = true;
211 int ret;
212
213 if (ieee80211_sdata_running(sdata))
214 return -EBUSY;
215
216 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
217 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
218 check_dup = false;
219
220 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
221 if (ret)
222 return ret;
223
224 ret = eth_mac_addr(dev, sa);
225
226 if (ret == 0)
227 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
228
229 return ret;
230 }
231
232 static inline int identical_mac_addr_allowed(int type1, int type2)
233 {
234 return type1 == NL80211_IFTYPE_MONITOR ||
235 type2 == NL80211_IFTYPE_MONITOR ||
236 type1 == NL80211_IFTYPE_P2P_DEVICE ||
237 type2 == NL80211_IFTYPE_P2P_DEVICE ||
238 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
239 (type1 == NL80211_IFTYPE_WDS &&
240 (type2 == NL80211_IFTYPE_WDS ||
241 type2 == NL80211_IFTYPE_AP)) ||
242 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
243 (type1 == NL80211_IFTYPE_AP_VLAN &&
244 (type2 == NL80211_IFTYPE_AP ||
245 type2 == NL80211_IFTYPE_AP_VLAN));
246 }
247
248 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
249 enum nl80211_iftype iftype)
250 {
251 struct ieee80211_local *local = sdata->local;
252 struct ieee80211_sub_if_data *nsdata;
253 int ret;
254
255 ASSERT_RTNL();
256
257 /* we hold the RTNL here so can safely walk the list */
258 list_for_each_entry(nsdata, &local->interfaces, list) {
259 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
260 /*
261 * Allow only a single IBSS interface to be up at any
262 * time. This is restricted because beacon distribution
263 * cannot work properly if both are in the same IBSS.
264 *
265 * To remove this restriction we'd have to disallow them
266 * from setting the same SSID on different IBSS interfaces
267 * belonging to the same hardware. Then, however, we're
268 * faced with having to adopt two different TSF timers...
269 */
270 if (iftype == NL80211_IFTYPE_ADHOC &&
271 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
272 return -EBUSY;
273 /*
274 * will not add another interface while any channel
275 * switch is active.
276 */
277 if (nsdata->vif.csa_active)
278 return -EBUSY;
279
280 /*
281 * The remaining checks are only performed for interfaces
282 * with the same MAC address.
283 */
284 if (!ether_addr_equal(sdata->vif.addr,
285 nsdata->vif.addr))
286 continue;
287
288 /*
289 * check whether it may have the same address
290 */
291 if (!identical_mac_addr_allowed(iftype,
292 nsdata->vif.type))
293 return -ENOTUNIQ;
294
295 /*
296 * can only add VLANs to enabled APs
297 */
298 if (iftype == NL80211_IFTYPE_AP_VLAN &&
299 nsdata->vif.type == NL80211_IFTYPE_AP)
300 sdata->bss = &nsdata->u.ap;
301 }
302 }
303
304 mutex_lock(&local->chanctx_mtx);
305 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
306 mutex_unlock(&local->chanctx_mtx);
307 return ret;
308 }
309
310 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
311 enum nl80211_iftype iftype)
312 {
313 int n_queues = sdata->local->hw.queues;
314 int i;
315
316 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
317 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
318 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
319 IEEE80211_INVAL_HW_QUEUE))
320 return -EINVAL;
321 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
322 n_queues))
323 return -EINVAL;
324 }
325 }
326
327 if ((iftype != NL80211_IFTYPE_AP &&
328 iftype != NL80211_IFTYPE_P2P_GO &&
329 iftype != NL80211_IFTYPE_MESH_POINT) ||
330 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
331 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
332 return 0;
333 }
334
335 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
336 return -EINVAL;
337
338 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
339 return -EINVAL;
340
341 return 0;
342 }
343
344 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
345 const int offset)
346 {
347 struct ieee80211_local *local = sdata->local;
348 u32 flags = sdata->u.mntr_flags;
349
350 #define ADJUST(_f, _s) do { \
351 if (flags & MONITOR_FLAG_##_f) \
352 local->fif_##_s += offset; \
353 } while (0)
354
355 ADJUST(FCSFAIL, fcsfail);
356 ADJUST(PLCPFAIL, plcpfail);
357 ADJUST(CONTROL, control);
358 ADJUST(CONTROL, pspoll);
359 ADJUST(OTHER_BSS, other_bss);
360
361 #undef ADJUST
362 }
363
364 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
365 {
366 struct ieee80211_local *local = sdata->local;
367 int i;
368
369 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
370 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
371 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
372 else if (local->hw.queues >= IEEE80211_NUM_ACS)
373 sdata->vif.hw_queue[i] = i;
374 else
375 sdata->vif.hw_queue[i] = 0;
376 }
377 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
378 }
379
380 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
381 {
382 struct ieee80211_sub_if_data *sdata;
383 int ret;
384
385 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
386 return 0;
387
388 ASSERT_RTNL();
389
390 if (local->monitor_sdata)
391 return 0;
392
393 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
394 if (!sdata)
395 return -ENOMEM;
396
397 /* set up data */
398 sdata->local = local;
399 sdata->vif.type = NL80211_IFTYPE_MONITOR;
400 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
401 wiphy_name(local->hw.wiphy));
402 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
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_INIT_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_INIT_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 mutex_lock(&local->mtx);
501 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
502 mutex_unlock(&local->mtx);
503
504 master = container_of(sdata->bss,
505 struct ieee80211_sub_if_data, u.ap);
506 sdata->control_port_protocol =
507 master->control_port_protocol;
508 sdata->control_port_no_encrypt =
509 master->control_port_no_encrypt;
510 sdata->vif.cab_queue = master->vif.cab_queue;
511 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
512 sizeof(sdata->vif.hw_queue));
513 break;
514 }
515 case NL80211_IFTYPE_AP:
516 sdata->bss = &sdata->u.ap;
517 break;
518 case NL80211_IFTYPE_MESH_POINT:
519 case NL80211_IFTYPE_STATION:
520 case NL80211_IFTYPE_MONITOR:
521 case NL80211_IFTYPE_ADHOC:
522 case NL80211_IFTYPE_P2P_DEVICE:
523 /* no special treatment */
524 break;
525 case NL80211_IFTYPE_UNSPECIFIED:
526 case NUM_NL80211_IFTYPES:
527 case NL80211_IFTYPE_P2P_CLIENT:
528 case NL80211_IFTYPE_P2P_GO:
529 /* cannot happen */
530 WARN_ON(1);
531 break;
532 }
533
534 if (local->open_count == 0) {
535 res = drv_start(local);
536 if (res)
537 goto err_del_bss;
538 /* we're brought up, everything changes */
539 hw_reconf_flags = ~0;
540 ieee80211_led_radio(local, true);
541 ieee80211_mod_tpt_led_trig(local,
542 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
543 }
544
545 /*
546 * Copy the hopefully now-present MAC address to
547 * this interface, if it has the special null one.
548 */
549 if (dev && is_zero_ether_addr(dev->dev_addr)) {
550 memcpy(dev->dev_addr,
551 local->hw.wiphy->perm_addr,
552 ETH_ALEN);
553 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
554
555 if (!is_valid_ether_addr(dev->dev_addr)) {
556 res = -EADDRNOTAVAIL;
557 goto err_stop;
558 }
559 }
560
561 switch (sdata->vif.type) {
562 case NL80211_IFTYPE_AP_VLAN:
563 /* no need to tell driver, but set carrier and chanctx */
564 if (rtnl_dereference(sdata->bss->beacon)) {
565 ieee80211_vif_vlan_copy_chanctx(sdata);
566 netif_carrier_on(dev);
567 } else {
568 netif_carrier_off(dev);
569 }
570 break;
571 case NL80211_IFTYPE_MONITOR:
572 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
573 local->cooked_mntrs++;
574 break;
575 }
576
577 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
578 res = drv_add_interface(local, sdata);
579 if (res)
580 goto err_stop;
581 } else if (local->monitors == 0 && local->open_count == 0) {
582 res = ieee80211_add_virtual_monitor(local);
583 if (res)
584 goto err_stop;
585 }
586
587 /* must be before the call to ieee80211_configure_filter */
588 local->monitors++;
589 if (local->monitors == 1) {
590 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
591 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
592 }
593
594 ieee80211_adjust_monitor_flags(sdata, 1);
595 ieee80211_configure_filter(local);
596 mutex_lock(&local->mtx);
597 ieee80211_recalc_idle(local);
598 mutex_unlock(&local->mtx);
599
600 netif_carrier_on(dev);
601 break;
602 default:
603 if (coming_up) {
604 ieee80211_del_virtual_monitor(local);
605
606 res = drv_add_interface(local, sdata);
607 if (res)
608 goto err_stop;
609 res = ieee80211_check_queues(sdata,
610 ieee80211_vif_type_p2p(&sdata->vif));
611 if (res)
612 goto err_del_interface;
613 }
614
615 if (sdata->vif.type == NL80211_IFTYPE_AP) {
616 local->fif_pspoll++;
617 local->fif_probe_req++;
618
619 ieee80211_configure_filter(local);
620 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
621 local->fif_probe_req++;
622 }
623
624 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
625 changed |= ieee80211_reset_erp_info(sdata);
626 ieee80211_bss_info_change_notify(sdata, changed);
627
628 switch (sdata->vif.type) {
629 case NL80211_IFTYPE_STATION:
630 case NL80211_IFTYPE_ADHOC:
631 case NL80211_IFTYPE_AP:
632 case NL80211_IFTYPE_MESH_POINT:
633 netif_carrier_off(dev);
634 break;
635 case NL80211_IFTYPE_WDS:
636 case NL80211_IFTYPE_P2P_DEVICE:
637 break;
638 default:
639 /* not reached */
640 WARN_ON(1);
641 }
642
643 /*
644 * set default queue parameters so drivers don't
645 * need to initialise the hardware if the hardware
646 * doesn't start up with sane defaults
647 */
648 ieee80211_set_wmm_default(sdata, true);
649 }
650
651 set_bit(SDATA_STATE_RUNNING, &sdata->state);
652
653 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
654 /* Create STA entry for the WDS peer */
655 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
656 GFP_KERNEL);
657 if (!sta) {
658 res = -ENOMEM;
659 goto err_del_interface;
660 }
661
662 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
663 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
664 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
665
666 res = sta_info_insert(sta);
667 if (res) {
668 /* STA has been freed */
669 goto err_del_interface;
670 }
671
672 rate_control_rate_init(sta);
673 netif_carrier_on(dev);
674 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
675 rcu_assign_pointer(local->p2p_sdata, sdata);
676 }
677
678 /*
679 * set_multicast_list will be invoked by the networking core
680 * which will check whether any increments here were done in
681 * error and sync them down to the hardware as filter flags.
682 */
683 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
684 atomic_inc(&local->iff_allmultis);
685
686 if (sdata->flags & IEEE80211_SDATA_PROMISC)
687 atomic_inc(&local->iff_promiscs);
688
689 if (coming_up)
690 local->open_count++;
691
692 if (hw_reconf_flags)
693 ieee80211_hw_config(local, hw_reconf_flags);
694
695 ieee80211_recalc_ps(local, -1);
696
697 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
698 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
699 /* XXX: for AP_VLAN, actually track AP queues */
700 netif_tx_start_all_queues(dev);
701 } else if (dev) {
702 unsigned long flags;
703 int n_acs = IEEE80211_NUM_ACS;
704 int ac;
705
706 if (local->hw.queues < IEEE80211_NUM_ACS)
707 n_acs = 1;
708
709 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
710 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
711 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
712 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
713 for (ac = 0; ac < n_acs; ac++) {
714 int ac_queue = sdata->vif.hw_queue[ac];
715
716 if (local->queue_stop_reasons[ac_queue] == 0 &&
717 skb_queue_empty(&local->pending[ac_queue]))
718 netif_start_subqueue(dev, ac);
719 }
720 }
721 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
722 }
723
724 return 0;
725 err_del_interface:
726 drv_remove_interface(local, sdata);
727 err_stop:
728 if (!local->open_count)
729 drv_stop(local);
730 err_del_bss:
731 sdata->bss = NULL;
732 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
733 mutex_lock(&local->mtx);
734 list_del(&sdata->u.vlan.list);
735 mutex_unlock(&local->mtx);
736 }
737 /* might already be clear but that doesn't matter */
738 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
739 return res;
740 }
741
742 static int ieee80211_open(struct net_device *dev)
743 {
744 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
745 int err;
746
747 /* fail early if user set an invalid address */
748 if (!is_valid_ether_addr(dev->dev_addr))
749 return -EADDRNOTAVAIL;
750
751 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
752 if (err)
753 return err;
754
755 return ieee80211_do_open(&sdata->wdev, true);
756 }
757
758 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
759 bool going_down)
760 {
761 struct ieee80211_local *local = sdata->local;
762 unsigned long flags;
763 struct sk_buff *skb, *tmp;
764 u32 hw_reconf_flags = 0;
765 int i, flushed;
766 struct ps_data *ps;
767 struct cfg80211_chan_def chandef;
768
769 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
770
771 if (rcu_access_pointer(local->scan_sdata) == sdata)
772 ieee80211_scan_cancel(local);
773
774 /*
775 * Stop TX on this interface first.
776 */
777 if (sdata->dev)
778 netif_tx_stop_all_queues(sdata->dev);
779
780 ieee80211_roc_purge(local, sdata);
781
782 switch (sdata->vif.type) {
783 case NL80211_IFTYPE_STATION:
784 ieee80211_mgd_stop(sdata);
785 break;
786 case NL80211_IFTYPE_ADHOC:
787 ieee80211_ibss_stop(sdata);
788 break;
789 case NL80211_IFTYPE_AP:
790 cancel_work_sync(&sdata->u.ap.request_smps_work);
791 break;
792 default:
793 break;
794 }
795
796 /*
797 * Remove all stations associated with this interface.
798 *
799 * This must be done before calling ops->remove_interface()
800 * because otherwise we can later invoke ops->sta_notify()
801 * whenever the STAs are removed, and that invalidates driver
802 * assumptions about always getting a vif pointer that is valid
803 * (because if we remove a STA after ops->remove_interface()
804 * the driver will have removed the vif info already!)
805 *
806 * This is relevant only in WDS mode, in all other modes we've
807 * already removed all stations when disconnecting or similar,
808 * so warn otherwise.
809 */
810 flushed = sta_info_flush(sdata);
811 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
812 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
813
814 /* don't count this interface for promisc/allmulti while it is down */
815 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
816 atomic_dec(&local->iff_allmultis);
817
818 if (sdata->flags & IEEE80211_SDATA_PROMISC)
819 atomic_dec(&local->iff_promiscs);
820
821 if (sdata->vif.type == NL80211_IFTYPE_AP) {
822 local->fif_pspoll--;
823 local->fif_probe_req--;
824 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
825 local->fif_probe_req--;
826 }
827
828 if (sdata->dev) {
829 netif_addr_lock_bh(sdata->dev);
830 spin_lock_bh(&local->filter_lock);
831 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
832 sdata->dev->addr_len);
833 spin_unlock_bh(&local->filter_lock);
834 netif_addr_unlock_bh(sdata->dev);
835 }
836
837 del_timer_sync(&local->dynamic_ps_timer);
838 cancel_work_sync(&local->dynamic_ps_enable_work);
839
840 cancel_work_sync(&sdata->recalc_smps);
841 sdata_lock(sdata);
842 mutex_lock(&local->mtx);
843 sdata->vif.csa_active = false;
844 if (!ieee80211_csa_needs_block_tx(local))
845 ieee80211_wake_queues_by_reason(&local->hw,
846 IEEE80211_MAX_QUEUE_MAP,
847 IEEE80211_QUEUE_STOP_REASON_CSA);
848 mutex_unlock(&local->mtx);
849 sdata_unlock(sdata);
850
851 cancel_work_sync(&sdata->csa_finalize_work);
852
853 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
854
855 if (sdata->wdev.cac_started) {
856 chandef = sdata->vif.bss_conf.chandef;
857 WARN_ON(local->suspended);
858 mutex_lock(&local->mtx);
859 ieee80211_vif_release_channel(sdata);
860 mutex_unlock(&local->mtx);
861 cfg80211_cac_event(sdata->dev, &chandef,
862 NL80211_RADAR_CAC_ABORTED,
863 GFP_KERNEL);
864 }
865
866 /* APs need special treatment */
867 if (sdata->vif.type == NL80211_IFTYPE_AP) {
868 struct ieee80211_sub_if_data *vlan, *tmpsdata;
869
870 /* down all dependent devices, that is VLANs */
871 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
872 u.vlan.list)
873 dev_close(vlan->dev);
874 WARN_ON(!list_empty(&sdata->u.ap.vlans));
875 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
876 /* remove all packets in parent bc_buf pointing to this dev */
877 ps = &sdata->bss->ps;
878
879 spin_lock_irqsave(&ps->bc_buf.lock, flags);
880 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
881 if (skb->dev == sdata->dev) {
882 __skb_unlink(skb, &ps->bc_buf);
883 local->total_ps_buffered--;
884 ieee80211_free_txskb(&local->hw, skb);
885 }
886 }
887 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
888 }
889
890 if (going_down)
891 local->open_count--;
892
893 switch (sdata->vif.type) {
894 case NL80211_IFTYPE_AP_VLAN:
895 mutex_lock(&local->mtx);
896 list_del(&sdata->u.vlan.list);
897 mutex_unlock(&local->mtx);
898 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
899 /* no need to tell driver */
900 break;
901 case NL80211_IFTYPE_MONITOR:
902 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
903 local->cooked_mntrs--;
904 break;
905 }
906
907 local->monitors--;
908 if (local->monitors == 0) {
909 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
910 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
911 }
912
913 ieee80211_adjust_monitor_flags(sdata, -1);
914 break;
915 case NL80211_IFTYPE_P2P_DEVICE:
916 /* relies on synchronize_rcu() below */
917 RCU_INIT_POINTER(local->p2p_sdata, NULL);
918 /* fall through */
919 default:
920 cancel_work_sync(&sdata->work);
921 /*
922 * When we get here, the interface is marked down.
923 * Free the remaining keys, if there are any
924 * (shouldn't be, except maybe in WDS mode?)
925 *
926 * Force the key freeing to always synchronize_net()
927 * to wait for the RX path in case it is using this
928 * interface enqueuing frames * at this very time on
929 * another CPU.
930 */
931 ieee80211_free_keys(sdata, true);
932
933 /* fall through */
934 case NL80211_IFTYPE_AP:
935 skb_queue_purge(&sdata->skb_queue);
936 }
937
938 sdata->bss = NULL;
939
940 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
941 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
942 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
943 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
944 if (info->control.vif == &sdata->vif) {
945 __skb_unlink(skb, &local->pending[i]);
946 ieee80211_free_txskb(&local->hw, skb);
947 }
948 }
949 }
950 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
951
952 if (local->open_count == 0)
953 ieee80211_clear_tx_pending(local);
954
955 /*
956 * If the interface goes down while suspended, presumably because
957 * the device was unplugged and that happens before our resume,
958 * then the driver is already unconfigured and the remainder of
959 * this function isn't needed.
960 * XXX: what about WoWLAN? If the device has software state, e.g.
961 * memory allocated, it might expect teardown commands from
962 * mac80211 here?
963 */
964 if (local->suspended) {
965 WARN_ON(local->wowlan);
966 WARN_ON(rtnl_dereference(local->monitor_sdata));
967 return;
968 }
969
970 switch (sdata->vif.type) {
971 case NL80211_IFTYPE_AP_VLAN:
972 break;
973 case NL80211_IFTYPE_MONITOR:
974 if (local->monitors == 0)
975 ieee80211_del_virtual_monitor(local);
976
977 mutex_lock(&local->mtx);
978 ieee80211_recalc_idle(local);
979 mutex_unlock(&local->mtx);
980
981 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
982 break;
983
984 /* fall through */
985 default:
986 if (going_down)
987 drv_remove_interface(local, sdata);
988 }
989
990 ieee80211_recalc_ps(local, -1);
991
992 if (local->open_count == 0) {
993 ieee80211_stop_device(local);
994
995 /* no reconfiguring after stop! */
996 return;
997 }
998
999 /* do after stop to avoid reconfiguring when we stop anyway */
1000 ieee80211_configure_filter(local);
1001 ieee80211_hw_config(local, hw_reconf_flags);
1002
1003 if (local->monitors == local->open_count)
1004 ieee80211_add_virtual_monitor(local);
1005 }
1006
1007 static int ieee80211_stop(struct net_device *dev)
1008 {
1009 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1010
1011 ieee80211_do_stop(sdata, true);
1012
1013 return 0;
1014 }
1015
1016 static void ieee80211_set_multicast_list(struct net_device *dev)
1017 {
1018 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1019 struct ieee80211_local *local = sdata->local;
1020 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1021
1022 allmulti = !!(dev->flags & IFF_ALLMULTI);
1023 promisc = !!(dev->flags & IFF_PROMISC);
1024 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1025 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1026
1027 if (allmulti != sdata_allmulti) {
1028 if (dev->flags & IFF_ALLMULTI)
1029 atomic_inc(&local->iff_allmultis);
1030 else
1031 atomic_dec(&local->iff_allmultis);
1032 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1033 }
1034
1035 if (promisc != sdata_promisc) {
1036 if (dev->flags & IFF_PROMISC)
1037 atomic_inc(&local->iff_promiscs);
1038 else
1039 atomic_dec(&local->iff_promiscs);
1040 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1041 }
1042 spin_lock_bh(&local->filter_lock);
1043 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1044 spin_unlock_bh(&local->filter_lock);
1045 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1046 }
1047
1048 /*
1049 * Called when the netdev is removed or, by the code below, before
1050 * the interface type changes.
1051 */
1052 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1053 {
1054 int i;
1055
1056 /* free extra data */
1057 ieee80211_free_keys(sdata, false);
1058
1059 ieee80211_debugfs_remove_netdev(sdata);
1060
1061 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1062 __skb_queue_purge(&sdata->fragments[i].skb_list);
1063 sdata->fragment_next = 0;
1064
1065 if (ieee80211_vif_is_mesh(&sdata->vif))
1066 mesh_rmc_free(sdata);
1067 }
1068
1069 static void ieee80211_uninit(struct net_device *dev)
1070 {
1071 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1072 }
1073
1074 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1075 struct sk_buff *skb,
1076 void *accel_priv,
1077 select_queue_fallback_t fallback)
1078 {
1079 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1080 }
1081
1082 static const struct net_device_ops ieee80211_dataif_ops = {
1083 .ndo_open = ieee80211_open,
1084 .ndo_stop = ieee80211_stop,
1085 .ndo_uninit = ieee80211_uninit,
1086 .ndo_start_xmit = ieee80211_subif_start_xmit,
1087 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1088 .ndo_change_mtu = ieee80211_change_mtu,
1089 .ndo_set_mac_address = ieee80211_change_mac,
1090 .ndo_select_queue = ieee80211_netdev_select_queue,
1091 };
1092
1093 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1094 struct sk_buff *skb,
1095 void *accel_priv,
1096 select_queue_fallback_t fallback)
1097 {
1098 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1099 struct ieee80211_local *local = sdata->local;
1100 struct ieee80211_hdr *hdr;
1101 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1102
1103 if (local->hw.queues < IEEE80211_NUM_ACS)
1104 return 0;
1105
1106 if (skb->len < 4 ||
1107 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1108 return 0; /* doesn't matter, frame will be dropped */
1109
1110 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1111
1112 return ieee80211_select_queue_80211(sdata, skb, hdr);
1113 }
1114
1115 static const struct net_device_ops ieee80211_monitorif_ops = {
1116 .ndo_open = ieee80211_open,
1117 .ndo_stop = ieee80211_stop,
1118 .ndo_uninit = ieee80211_uninit,
1119 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1120 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1121 .ndo_change_mtu = ieee80211_change_mtu,
1122 .ndo_set_mac_address = ieee80211_change_mac,
1123 .ndo_select_queue = ieee80211_monitor_select_queue,
1124 };
1125
1126 static void ieee80211_if_setup(struct net_device *dev)
1127 {
1128 ether_setup(dev);
1129 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1130 dev->netdev_ops = &ieee80211_dataif_ops;
1131 dev->destructor = free_netdev;
1132 }
1133
1134 static void ieee80211_iface_work(struct work_struct *work)
1135 {
1136 struct ieee80211_sub_if_data *sdata =
1137 container_of(work, struct ieee80211_sub_if_data, work);
1138 struct ieee80211_local *local = sdata->local;
1139 struct sk_buff *skb;
1140 struct sta_info *sta;
1141 struct ieee80211_ra_tid *ra_tid;
1142
1143 if (!ieee80211_sdata_running(sdata))
1144 return;
1145
1146 if (local->scanning)
1147 return;
1148
1149 /*
1150 * ieee80211_queue_work() should have picked up most cases,
1151 * here we'll pick the rest.
1152 */
1153 if (WARN(local->suspended,
1154 "interface work scheduled while going to suspend\n"))
1155 return;
1156
1157 /* first process frames */
1158 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1159 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1160
1161 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1162 ra_tid = (void *)&skb->cb;
1163 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1164 ra_tid->tid);
1165 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1166 ra_tid = (void *)&skb->cb;
1167 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1168 ra_tid->tid);
1169 } else if (ieee80211_is_action(mgmt->frame_control) &&
1170 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1171 int len = skb->len;
1172
1173 mutex_lock(&local->sta_mtx);
1174 sta = sta_info_get_bss(sdata, mgmt->sa);
1175 if (sta) {
1176 switch (mgmt->u.action.u.addba_req.action_code) {
1177 case WLAN_ACTION_ADDBA_REQ:
1178 ieee80211_process_addba_request(
1179 local, sta, mgmt, len);
1180 break;
1181 case WLAN_ACTION_ADDBA_RESP:
1182 ieee80211_process_addba_resp(local, sta,
1183 mgmt, len);
1184 break;
1185 case WLAN_ACTION_DELBA:
1186 ieee80211_process_delba(sdata, sta,
1187 mgmt, len);
1188 break;
1189 default:
1190 WARN_ON(1);
1191 break;
1192 }
1193 }
1194 mutex_unlock(&local->sta_mtx);
1195 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1196 struct ieee80211_hdr *hdr = (void *)mgmt;
1197 /*
1198 * So the frame isn't mgmt, but frame_control
1199 * is at the right place anyway, of course, so
1200 * the if statement is correct.
1201 *
1202 * Warn if we have other data frame types here,
1203 * they must not get here.
1204 */
1205 WARN_ON(hdr->frame_control &
1206 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1207 WARN_ON(!(hdr->seq_ctrl &
1208 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1209 /*
1210 * This was a fragment of a frame, received while
1211 * a block-ack session was active. That cannot be
1212 * right, so terminate the session.
1213 */
1214 mutex_lock(&local->sta_mtx);
1215 sta = sta_info_get_bss(sdata, mgmt->sa);
1216 if (sta) {
1217 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1218 IEEE80211_QOS_CTL_TID_MASK;
1219
1220 __ieee80211_stop_rx_ba_session(
1221 sta, tid, WLAN_BACK_RECIPIENT,
1222 WLAN_REASON_QSTA_REQUIRE_SETUP,
1223 true);
1224 }
1225 mutex_unlock(&local->sta_mtx);
1226 } else switch (sdata->vif.type) {
1227 case NL80211_IFTYPE_STATION:
1228 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1229 break;
1230 case NL80211_IFTYPE_ADHOC:
1231 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1232 break;
1233 case NL80211_IFTYPE_MESH_POINT:
1234 if (!ieee80211_vif_is_mesh(&sdata->vif))
1235 break;
1236 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1237 break;
1238 default:
1239 WARN(1, "frame for unexpected interface type");
1240 break;
1241 }
1242
1243 kfree_skb(skb);
1244 }
1245
1246 /* then other type-dependent work */
1247 switch (sdata->vif.type) {
1248 case NL80211_IFTYPE_STATION:
1249 ieee80211_sta_work(sdata);
1250 break;
1251 case NL80211_IFTYPE_ADHOC:
1252 ieee80211_ibss_work(sdata);
1253 break;
1254 case NL80211_IFTYPE_MESH_POINT:
1255 if (!ieee80211_vif_is_mesh(&sdata->vif))
1256 break;
1257 ieee80211_mesh_work(sdata);
1258 break;
1259 default:
1260 break;
1261 }
1262 }
1263
1264 static void ieee80211_recalc_smps_work(struct work_struct *work)
1265 {
1266 struct ieee80211_sub_if_data *sdata =
1267 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1268
1269 ieee80211_recalc_smps(sdata);
1270 }
1271
1272 /*
1273 * Helper function to initialise an interface to a specific type.
1274 */
1275 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1276 enum nl80211_iftype type)
1277 {
1278 /* clear type-dependent union */
1279 memset(&sdata->u, 0, sizeof(sdata->u));
1280
1281 /* and set some type-dependent values */
1282 sdata->vif.type = type;
1283 sdata->vif.p2p = false;
1284 sdata->wdev.iftype = type;
1285
1286 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1287 sdata->control_port_no_encrypt = false;
1288 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1289
1290 sdata->noack_map = 0;
1291
1292 /* only monitor/p2p-device differ */
1293 if (sdata->dev) {
1294 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1295 sdata->dev->type = ARPHRD_ETHER;
1296 }
1297
1298 skb_queue_head_init(&sdata->skb_queue);
1299 INIT_WORK(&sdata->work, ieee80211_iface_work);
1300 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1301 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1302 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1303 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1304
1305 switch (type) {
1306 case NL80211_IFTYPE_P2P_GO:
1307 type = NL80211_IFTYPE_AP;
1308 sdata->vif.type = type;
1309 sdata->vif.p2p = true;
1310 /* fall through */
1311 case NL80211_IFTYPE_AP:
1312 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1313 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1314 INIT_WORK(&sdata->u.ap.request_smps_work,
1315 ieee80211_request_smps_ap_work);
1316 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1317 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1318 break;
1319 case NL80211_IFTYPE_P2P_CLIENT:
1320 type = NL80211_IFTYPE_STATION;
1321 sdata->vif.type = type;
1322 sdata->vif.p2p = true;
1323 /* fall through */
1324 case NL80211_IFTYPE_STATION:
1325 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1326 ieee80211_sta_setup_sdata(sdata);
1327 break;
1328 case NL80211_IFTYPE_ADHOC:
1329 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1330 ieee80211_ibss_setup_sdata(sdata);
1331 break;
1332 case NL80211_IFTYPE_MESH_POINT:
1333 if (ieee80211_vif_is_mesh(&sdata->vif))
1334 ieee80211_mesh_init_sdata(sdata);
1335 break;
1336 case NL80211_IFTYPE_MONITOR:
1337 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1338 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1339 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1340 MONITOR_FLAG_OTHER_BSS;
1341 break;
1342 case NL80211_IFTYPE_WDS:
1343 sdata->vif.bss_conf.bssid = NULL;
1344 break;
1345 case NL80211_IFTYPE_AP_VLAN:
1346 case NL80211_IFTYPE_P2P_DEVICE:
1347 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1348 break;
1349 case NL80211_IFTYPE_UNSPECIFIED:
1350 case NUM_NL80211_IFTYPES:
1351 BUG();
1352 break;
1353 }
1354
1355 ieee80211_debugfs_add_netdev(sdata);
1356 }
1357
1358 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1359 enum nl80211_iftype type)
1360 {
1361 struct ieee80211_local *local = sdata->local;
1362 int ret, err;
1363 enum nl80211_iftype internal_type = type;
1364 bool p2p = false;
1365
1366 ASSERT_RTNL();
1367
1368 if (!local->ops->change_interface)
1369 return -EBUSY;
1370
1371 switch (sdata->vif.type) {
1372 case NL80211_IFTYPE_AP:
1373 case NL80211_IFTYPE_STATION:
1374 case NL80211_IFTYPE_ADHOC:
1375 /*
1376 * Could maybe also all others here?
1377 * Just not sure how that interacts
1378 * with the RX/config path e.g. for
1379 * mesh.
1380 */
1381 break;
1382 default:
1383 return -EBUSY;
1384 }
1385
1386 switch (type) {
1387 case NL80211_IFTYPE_AP:
1388 case NL80211_IFTYPE_STATION:
1389 case NL80211_IFTYPE_ADHOC:
1390 /*
1391 * Could probably support everything
1392 * but WDS here (WDS do_open can fail
1393 * under memory pressure, which this
1394 * code isn't prepared to handle).
1395 */
1396 break;
1397 case NL80211_IFTYPE_P2P_CLIENT:
1398 p2p = true;
1399 internal_type = NL80211_IFTYPE_STATION;
1400 break;
1401 case NL80211_IFTYPE_P2P_GO:
1402 p2p = true;
1403 internal_type = NL80211_IFTYPE_AP;
1404 break;
1405 default:
1406 return -EBUSY;
1407 }
1408
1409 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1410 if (ret)
1411 return ret;
1412
1413 ieee80211_do_stop(sdata, false);
1414
1415 ieee80211_teardown_sdata(sdata);
1416
1417 ret = drv_change_interface(local, sdata, internal_type, p2p);
1418 if (ret)
1419 type = ieee80211_vif_type_p2p(&sdata->vif);
1420
1421 /*
1422 * Ignore return value here, there's not much we can do since
1423 * the driver changed the interface type internally already.
1424 * The warnings will hopefully make driver authors fix it :-)
1425 */
1426 ieee80211_check_queues(sdata, type);
1427
1428 ieee80211_setup_sdata(sdata, type);
1429
1430 err = ieee80211_do_open(&sdata->wdev, false);
1431 WARN(err, "type change: do_open returned %d", err);
1432
1433 return ret;
1434 }
1435
1436 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1437 enum nl80211_iftype type)
1438 {
1439 int ret;
1440
1441 ASSERT_RTNL();
1442
1443 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1444 return 0;
1445
1446 if (ieee80211_sdata_running(sdata)) {
1447 ret = ieee80211_runtime_change_iftype(sdata, type);
1448 if (ret)
1449 return ret;
1450 } else {
1451 /* Purge and reset type-dependent state. */
1452 ieee80211_teardown_sdata(sdata);
1453 ieee80211_setup_sdata(sdata, type);
1454 }
1455
1456 /* reset some values that shouldn't be kept across type changes */
1457 sdata->drop_unencrypted = 0;
1458 if (type == NL80211_IFTYPE_STATION)
1459 sdata->u.mgd.use_4addr = false;
1460
1461 return 0;
1462 }
1463
1464 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1465 u8 *perm_addr, enum nl80211_iftype type)
1466 {
1467 struct ieee80211_sub_if_data *sdata;
1468 u64 mask, start, addr, val, inc;
1469 u8 *m;
1470 u8 tmp_addr[ETH_ALEN];
1471 int i;
1472
1473 /* default ... something at least */
1474 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1475
1476 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1477 local->hw.wiphy->n_addresses <= 1)
1478 return;
1479
1480 mutex_lock(&local->iflist_mtx);
1481
1482 switch (type) {
1483 case NL80211_IFTYPE_MONITOR:
1484 /* doesn't matter */
1485 break;
1486 case NL80211_IFTYPE_WDS:
1487 case NL80211_IFTYPE_AP_VLAN:
1488 /* match up with an AP interface */
1489 list_for_each_entry(sdata, &local->interfaces, list) {
1490 if (sdata->vif.type != NL80211_IFTYPE_AP)
1491 continue;
1492 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1493 break;
1494 }
1495 /* keep default if no AP interface present */
1496 break;
1497 case NL80211_IFTYPE_P2P_CLIENT:
1498 case NL80211_IFTYPE_P2P_GO:
1499 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1500 list_for_each_entry(sdata, &local->interfaces, list) {
1501 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1502 continue;
1503 if (!ieee80211_sdata_running(sdata))
1504 continue;
1505 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1506 goto out_unlock;
1507 }
1508 }
1509 /* otherwise fall through */
1510 default:
1511 /* assign a new address if possible -- try n_addresses first */
1512 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1513 bool used = false;
1514
1515 list_for_each_entry(sdata, &local->interfaces, list) {
1516 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1517 sdata->vif.addr)) {
1518 used = true;
1519 break;
1520 }
1521 }
1522
1523 if (!used) {
1524 memcpy(perm_addr,
1525 local->hw.wiphy->addresses[i].addr,
1526 ETH_ALEN);
1527 break;
1528 }
1529 }
1530
1531 /* try mask if available */
1532 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1533 break;
1534
1535 m = local->hw.wiphy->addr_mask;
1536 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1537 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1538 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1539
1540 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1541 /* not a contiguous mask ... not handled now! */
1542 pr_info("not contiguous\n");
1543 break;
1544 }
1545
1546 /*
1547 * Pick address of existing interface in case user changed
1548 * MAC address manually, default to perm_addr.
1549 */
1550 m = local->hw.wiphy->perm_addr;
1551 list_for_each_entry(sdata, &local->interfaces, list) {
1552 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1553 continue;
1554 m = sdata->vif.addr;
1555 break;
1556 }
1557 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1558 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1559 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1560
1561 inc = 1ULL<<__ffs64(mask);
1562 val = (start & mask);
1563 addr = (start & ~mask) | (val & mask);
1564 do {
1565 bool used = false;
1566
1567 tmp_addr[5] = addr >> 0*8;
1568 tmp_addr[4] = addr >> 1*8;
1569 tmp_addr[3] = addr >> 2*8;
1570 tmp_addr[2] = addr >> 3*8;
1571 tmp_addr[1] = addr >> 4*8;
1572 tmp_addr[0] = addr >> 5*8;
1573
1574 val += inc;
1575
1576 list_for_each_entry(sdata, &local->interfaces, list) {
1577 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1578 used = true;
1579 break;
1580 }
1581 }
1582
1583 if (!used) {
1584 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1585 break;
1586 }
1587 addr = (start & ~mask) | (val & mask);
1588 } while (addr != start);
1589
1590 break;
1591 }
1592
1593 out_unlock:
1594 mutex_unlock(&local->iflist_mtx);
1595 }
1596
1597 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1598 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1599 struct vif_params *params)
1600 {
1601 struct net_device *ndev = NULL;
1602 struct ieee80211_sub_if_data *sdata = NULL;
1603 int ret, i;
1604 int txqs = 1;
1605
1606 ASSERT_RTNL();
1607
1608 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1609 struct wireless_dev *wdev;
1610
1611 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1612 GFP_KERNEL);
1613 if (!sdata)
1614 return -ENOMEM;
1615 wdev = &sdata->wdev;
1616
1617 sdata->dev = NULL;
1618 strlcpy(sdata->name, name, IFNAMSIZ);
1619 ieee80211_assign_perm_addr(local, wdev->address, type);
1620 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1621 } else {
1622 if (local->hw.queues >= IEEE80211_NUM_ACS)
1623 txqs = IEEE80211_NUM_ACS;
1624
1625 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1626 local->hw.vif_data_size,
1627 name, ieee80211_if_setup, txqs, 1);
1628 if (!ndev)
1629 return -ENOMEM;
1630 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1631
1632 ndev->needed_headroom = local->tx_headroom +
1633 4*6 /* four MAC addresses */
1634 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1635 + 6 /* mesh */
1636 + 8 /* rfc1042/bridge tunnel */
1637 - ETH_HLEN /* ethernet hard_header_len */
1638 + IEEE80211_ENCRYPT_HEADROOM;
1639 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1640
1641 ret = dev_alloc_name(ndev, ndev->name);
1642 if (ret < 0) {
1643 free_netdev(ndev);
1644 return ret;
1645 }
1646
1647 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1648 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1649 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1650
1651 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1652 sdata = netdev_priv(ndev);
1653 ndev->ieee80211_ptr = &sdata->wdev;
1654 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1655 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1656
1657 sdata->dev = ndev;
1658 }
1659
1660 /* initialise type-independent data */
1661 sdata->wdev.wiphy = local->hw.wiphy;
1662 sdata->local = local;
1663
1664 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1665 skb_queue_head_init(&sdata->fragments[i].skb_list);
1666
1667 INIT_LIST_HEAD(&sdata->key_list);
1668
1669 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1670 ieee80211_dfs_cac_timer_work);
1671 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1672 ieee80211_delayed_tailroom_dec);
1673
1674 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1675 struct ieee80211_supported_band *sband;
1676 sband = local->hw.wiphy->bands[i];
1677 sdata->rc_rateidx_mask[i] =
1678 sband ? (1 << sband->n_bitrates) - 1 : 0;
1679 if (sband)
1680 memcpy(sdata->rc_rateidx_mcs_mask[i],
1681 sband->ht_cap.mcs.rx_mask,
1682 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1683 else
1684 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1685 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1686 }
1687
1688 ieee80211_set_default_queues(sdata);
1689
1690 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1691 sdata->user_power_level = local->user_power_level;
1692
1693 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1694
1695 /* setup type-dependent data */
1696 ieee80211_setup_sdata(sdata, type);
1697
1698 if (ndev) {
1699 if (params) {
1700 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1701 if (type == NL80211_IFTYPE_STATION)
1702 sdata->u.mgd.use_4addr = params->use_4addr;
1703 }
1704
1705 ndev->features |= local->hw.netdev_features;
1706
1707 ret = register_netdevice(ndev);
1708 if (ret) {
1709 free_netdev(ndev);
1710 return ret;
1711 }
1712 }
1713
1714 mutex_lock(&local->iflist_mtx);
1715 list_add_tail_rcu(&sdata->list, &local->interfaces);
1716 mutex_unlock(&local->iflist_mtx);
1717
1718 if (new_wdev)
1719 *new_wdev = &sdata->wdev;
1720
1721 return 0;
1722 }
1723
1724 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1725 {
1726 ASSERT_RTNL();
1727
1728 mutex_lock(&sdata->local->iflist_mtx);
1729 list_del_rcu(&sdata->list);
1730 mutex_unlock(&sdata->local->iflist_mtx);
1731
1732 synchronize_rcu();
1733
1734 if (sdata->dev) {
1735 unregister_netdevice(sdata->dev);
1736 } else {
1737 cfg80211_unregister_wdev(&sdata->wdev);
1738 kfree(sdata);
1739 }
1740 }
1741
1742 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1743 {
1744 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1745 return;
1746 ieee80211_do_stop(sdata, true);
1747 ieee80211_teardown_sdata(sdata);
1748 }
1749
1750 /*
1751 * Remove all interfaces, may only be called at hardware unregistration
1752 * time because it doesn't do RCU-safe list removals.
1753 */
1754 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1755 {
1756 struct ieee80211_sub_if_data *sdata, *tmp;
1757 LIST_HEAD(unreg_list);
1758 LIST_HEAD(wdev_list);
1759
1760 ASSERT_RTNL();
1761
1762 /*
1763 * Close all AP_VLAN interfaces first, as otherwise they
1764 * might be closed while the AP interface they belong to
1765 * is closed, causing unregister_netdevice_many() to crash.
1766 */
1767 list_for_each_entry(sdata, &local->interfaces, list)
1768 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1769 dev_close(sdata->dev);
1770
1771 mutex_lock(&local->iflist_mtx);
1772 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1773 list_del(&sdata->list);
1774
1775 if (sdata->dev)
1776 unregister_netdevice_queue(sdata->dev, &unreg_list);
1777 else
1778 list_add(&sdata->list, &wdev_list);
1779 }
1780 mutex_unlock(&local->iflist_mtx);
1781 unregister_netdevice_many(&unreg_list);
1782 list_del(&unreg_list);
1783
1784 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1785 list_del(&sdata->list);
1786 cfg80211_unregister_wdev(&sdata->wdev);
1787 kfree(sdata);
1788 }
1789 }
1790
1791 static int netdev_notify(struct notifier_block *nb,
1792 unsigned long state, void *ptr)
1793 {
1794 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1795 struct ieee80211_sub_if_data *sdata;
1796
1797 if (state != NETDEV_CHANGENAME)
1798 return NOTIFY_DONE;
1799
1800 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1801 return NOTIFY_DONE;
1802
1803 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1804 return NOTIFY_DONE;
1805
1806 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1807 memcpy(sdata->name, dev->name, IFNAMSIZ);
1808 ieee80211_debugfs_rename_netdev(sdata);
1809
1810 return NOTIFY_OK;
1811 }
1812
1813 static struct notifier_block mac80211_netdev_notifier = {
1814 .notifier_call = netdev_notify,
1815 };
1816
1817 int ieee80211_iface_init(void)
1818 {
1819 return register_netdevice_notifier(&mac80211_netdev_notifier);
1820 }
1821
1822 void ieee80211_iface_exit(void)
1823 {
1824 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1825 }
Linux kernel - Deliverables
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