1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/if_arp.h>
17 #include <linux/netdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "sta_info.h"
23 #include "debugfs_netdev.h"
24 #include "mesh.h"
25 #include "led.h"
26 #include "driver-ops.h"
27 #include "wme.h"
28 #include "rate.h"
29
30 /**
31 * DOC: Interface list locking
32 *
33 * The interface list in each struct ieee80211_local is protected
34 * three-fold:
35 *
36 * (1) modifications may only be done under the RTNL
37 * (2) modifications and readers are protected against each other by
38 * the iflist_mtx.
39 * (3) modifications are done in an RCU manner so atomic readers
40 * can traverse the list in RCU-safe blocks.
41 *
42 * As a consequence, reads (traversals) of the list can be protected
43 * by either the RTNL, the iflist_mtx or RCU.
44 */
45
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)46 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
47 {
48 struct ieee80211_chanctx_conf *chanctx_conf;
49 int power;
50
51 rcu_read_lock();
52 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
53 if (!chanctx_conf) {
54 rcu_read_unlock();
55 return false;
56 }
57
58 power = ieee80211_chandef_max_power(&chanctx_conf->def);
59 rcu_read_unlock();
60
61 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
62 power = min(power, sdata->user_power_level);
63
64 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
65 power = min(power, sdata->ap_power_level);
66
67 if (power != sdata->vif.bss_conf.txpower) {
68 sdata->vif.bss_conf.txpower = power;
69 ieee80211_hw_config(sdata->local, 0);
70 return true;
71 }
72
73 return false;
74 }
75
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
77 bool update_bss)
78 {
79 if (__ieee80211_recalc_txpower(sdata) ||
80 (update_bss && ieee80211_sdata_running(sdata)))
81 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
82 }
83
__ieee80211_idle_off(struct ieee80211_local * local)84 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
85 {
86 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
87 return 0;
88
89 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
90 return IEEE80211_CONF_CHANGE_IDLE;
91 }
92
__ieee80211_idle_on(struct ieee80211_local * local)93 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
94 {
95 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
96 return 0;
97
98 ieee80211_flush_queues(local, NULL, false);
99
100 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
101 return IEEE80211_CONF_CHANGE_IDLE;
102 }
103
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)104 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
105 bool force_active)
106 {
107 bool working, scanning, active;
108 unsigned int led_trig_start = 0, led_trig_stop = 0;
109
110 lockdep_assert_held(&local->mtx);
111
112 active = force_active ||
113 !list_empty(&local->chanctx_list) ||
114 local->monitors;
115
116 working = !local->ops->remain_on_channel &&
117 !list_empty(&local->roc_list);
118
119 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
120 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
121
122 if (working || scanning)
123 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124 else
125 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126
127 if (active)
128 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129 else
130 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131
132 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
133
134 if (working || scanning || active)
135 return __ieee80211_idle_off(local);
136 return __ieee80211_idle_on(local);
137 }
138
ieee80211_idle_off(struct ieee80211_local * local)139 u32 ieee80211_idle_off(struct ieee80211_local *local)
140 {
141 return __ieee80211_recalc_idle(local, true);
142 }
143
ieee80211_recalc_idle(struct ieee80211_local * local)144 void ieee80211_recalc_idle(struct ieee80211_local *local)
145 {
146 u32 change = __ieee80211_recalc_idle(local, false);
147 if (change)
148 ieee80211_hw_config(local, change);
149 }
150
ieee80211_change_mtu(struct net_device * dev,int new_mtu)151 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
152 {
153 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
154 return -EINVAL;
155
156 dev->mtu = new_mtu;
157 return 0;
158 }
159
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)160 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
161 bool check_dup)
162 {
163 struct ieee80211_local *local = sdata->local;
164 struct ieee80211_sub_if_data *iter;
165 u64 new, mask, tmp;
166 u8 *m;
167 int ret = 0;
168
169 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
170 return 0;
171
172 m = addr;
173 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176
177 m = local->hw.wiphy->addr_mask;
178 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
179 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
180 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
181
182 if (!check_dup)
183 return ret;
184
185 mutex_lock(&local->iflist_mtx);
186 list_for_each_entry(iter, &local->interfaces, list) {
187 if (iter == sdata)
188 continue;
189
190 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
191 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
192 continue;
193
194 m = iter->vif.addr;
195 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
196 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
197 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
198
199 if ((new & ~mask) != (tmp & ~mask)) {
200 ret = -EINVAL;
201 break;
202 }
203 }
204 mutex_unlock(&local->iflist_mtx);
205
206 return ret;
207 }
208
ieee80211_change_mac(struct net_device * dev,void * addr)209 static int ieee80211_change_mac(struct net_device *dev, void *addr)
210 {
211 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
212 struct sockaddr *sa = addr;
213 bool check_dup = true;
214 int ret;
215
216 if (ieee80211_sdata_running(sdata))
217 return -EBUSY;
218
219 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
220 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
221 check_dup = false;
222
223 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
224 if (ret)
225 return ret;
226
227 ret = eth_mac_addr(dev, sa);
228
229 if (ret == 0)
230 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
231
232 return ret;
233 }
234
identical_mac_addr_allowed(int type1,int type2)235 static inline int identical_mac_addr_allowed(int type1, int type2)
236 {
237 return type1 == NL80211_IFTYPE_MONITOR ||
238 type2 == NL80211_IFTYPE_MONITOR ||
239 type1 == NL80211_IFTYPE_P2P_DEVICE ||
240 type2 == NL80211_IFTYPE_P2P_DEVICE ||
241 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
242 (type1 == NL80211_IFTYPE_WDS &&
243 (type2 == NL80211_IFTYPE_WDS ||
244 type2 == NL80211_IFTYPE_AP)) ||
245 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
246 (type1 == NL80211_IFTYPE_AP_VLAN &&
247 (type2 == NL80211_IFTYPE_AP ||
248 type2 == NL80211_IFTYPE_AP_VLAN));
249 }
250
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)251 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
252 enum nl80211_iftype iftype)
253 {
254 struct ieee80211_local *local = sdata->local;
255 struct ieee80211_sub_if_data *nsdata;
256 int ret;
257
258 ASSERT_RTNL();
259
260 /* we hold the RTNL here so can safely walk the list */
261 list_for_each_entry(nsdata, &local->interfaces, list) {
262 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
263 /*
264 * Only OCB and monitor mode may coexist
265 */
266 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
267 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
268 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
269 nsdata->vif.type == NL80211_IFTYPE_OCB))
270 return -EBUSY;
271
272 /*
273 * Allow only a single IBSS interface to be up at any
274 * time. This is restricted because beacon distribution
275 * cannot work properly if both are in the same IBSS.
276 *
277 * To remove this restriction we'd have to disallow them
278 * from setting the same SSID on different IBSS interfaces
279 * belonging to the same hardware. Then, however, we're
280 * faced with having to adopt two different TSF timers...
281 */
282 if (iftype == NL80211_IFTYPE_ADHOC &&
283 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
284 return -EBUSY;
285 /*
286 * will not add another interface while any channel
287 * switch is active.
288 */
289 if (nsdata->vif.csa_active)
290 return -EBUSY;
291
292 /*
293 * The remaining checks are only performed for interfaces
294 * with the same MAC address.
295 */
296 if (!ether_addr_equal(sdata->vif.addr,
297 nsdata->vif.addr))
298 continue;
299
300 /*
301 * check whether it may have the same address
302 */
303 if (!identical_mac_addr_allowed(iftype,
304 nsdata->vif.type))
305 return -ENOTUNIQ;
306
307 /*
308 * can only add VLANs to enabled APs
309 */
310 if (iftype == NL80211_IFTYPE_AP_VLAN &&
311 nsdata->vif.type == NL80211_IFTYPE_AP)
312 sdata->bss = &nsdata->u.ap;
313 }
314 }
315
316 mutex_lock(&local->chanctx_mtx);
317 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
318 mutex_unlock(&local->chanctx_mtx);
319 return ret;
320 }
321
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)322 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
323 enum nl80211_iftype iftype)
324 {
325 int n_queues = sdata->local->hw.queues;
326 int i;
327
328 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
329 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
330 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
331 IEEE80211_INVAL_HW_QUEUE))
332 return -EINVAL;
333 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
334 n_queues))
335 return -EINVAL;
336 }
337 }
338
339 if ((iftype != NL80211_IFTYPE_AP &&
340 iftype != NL80211_IFTYPE_P2P_GO &&
341 iftype != NL80211_IFTYPE_MESH_POINT) ||
342 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
343 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
344 return 0;
345 }
346
347 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
348 return -EINVAL;
349
350 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
351 return -EINVAL;
352
353 return 0;
354 }
355
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)356 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
357 const int offset)
358 {
359 struct ieee80211_local *local = sdata->local;
360 u32 flags = sdata->u.mntr_flags;
361
362 #define ADJUST(_f, _s) do { \
363 if (flags & MONITOR_FLAG_##_f) \
364 local->fif_##_s += offset; \
365 } while (0)
366
367 ADJUST(FCSFAIL, fcsfail);
368 ADJUST(PLCPFAIL, plcpfail);
369 ADJUST(CONTROL, control);
370 ADJUST(CONTROL, pspoll);
371 ADJUST(OTHER_BSS, other_bss);
372
373 #undef ADJUST
374 }
375
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)376 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
377 {
378 struct ieee80211_local *local = sdata->local;
379 int i;
380
381 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
382 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
383 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
384 else if (local->hw.queues >= IEEE80211_NUM_ACS)
385 sdata->vif.hw_queue[i] = i;
386 else
387 sdata->vif.hw_queue[i] = 0;
388 }
389 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
390 }
391
ieee80211_add_virtual_monitor(struct ieee80211_local * local)392 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
393 {
394 struct ieee80211_sub_if_data *sdata;
395 int ret;
396
397 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
398 return 0;
399
400 ASSERT_RTNL();
401
402 if (local->monitor_sdata)
403 return 0;
404
405 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
406 if (!sdata)
407 return -ENOMEM;
408
409 /* set up data */
410 sdata->local = local;
411 sdata->vif.type = NL80211_IFTYPE_MONITOR;
412 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
413 wiphy_name(local->hw.wiphy));
414 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
415
416 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
417
418 ieee80211_set_default_queues(sdata);
419
420 ret = drv_add_interface(local, sdata);
421 if (WARN_ON(ret)) {
422 /* ok .. stupid driver, it asked for this! */
423 kfree(sdata);
424 return ret;
425 }
426
427 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
428 if (ret) {
429 kfree(sdata);
430 return ret;
431 }
432
433 mutex_lock(&local->iflist_mtx);
434 rcu_assign_pointer(local->monitor_sdata, sdata);
435 mutex_unlock(&local->iflist_mtx);
436
437 mutex_lock(&local->mtx);
438 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
439 IEEE80211_CHANCTX_EXCLUSIVE);
440 mutex_unlock(&local->mtx);
441 if (ret) {
442 mutex_lock(&local->iflist_mtx);
443 RCU_INIT_POINTER(local->monitor_sdata, NULL);
444 mutex_unlock(&local->iflist_mtx);
445 synchronize_net();
446 drv_remove_interface(local, sdata);
447 kfree(sdata);
448 return ret;
449 }
450
451 return 0;
452 }
453
ieee80211_del_virtual_monitor(struct ieee80211_local * local)454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
455 {
456 struct ieee80211_sub_if_data *sdata;
457
458 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
459 return;
460
461 ASSERT_RTNL();
462
463 mutex_lock(&local->iflist_mtx);
464
465 sdata = rcu_dereference_protected(local->monitor_sdata,
466 lockdep_is_held(&local->iflist_mtx));
467 if (!sdata) {
468 mutex_unlock(&local->iflist_mtx);
469 return;
470 }
471
472 RCU_INIT_POINTER(local->monitor_sdata, NULL);
473 mutex_unlock(&local->iflist_mtx);
474
475 synchronize_net();
476
477 mutex_lock(&local->mtx);
478 ieee80211_vif_release_channel(sdata);
479 mutex_unlock(&local->mtx);
480
481 drv_remove_interface(local, sdata);
482
483 kfree(sdata);
484 }
485
486 /*
487 * NOTE: Be very careful when changing this function, it must NOT return
488 * an error on interface type changes that have been pre-checked, so most
489 * checks should be in ieee80211_check_concurrent_iface.
490 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
492 {
493 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
494 struct net_device *dev = wdev->netdev;
495 struct ieee80211_local *local = sdata->local;
496 struct sta_info *sta;
497 u32 changed = 0;
498 int res;
499 u32 hw_reconf_flags = 0;
500
501 switch (sdata->vif.type) {
502 case NL80211_IFTYPE_WDS:
503 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
504 return -ENOLINK;
505 break;
506 case NL80211_IFTYPE_AP_VLAN: {
507 struct ieee80211_sub_if_data *master;
508
509 if (!sdata->bss)
510 return -ENOLINK;
511
512 mutex_lock(&local->mtx);
513 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
514 mutex_unlock(&local->mtx);
515
516 master = container_of(sdata->bss,
517 struct ieee80211_sub_if_data, u.ap);
518 sdata->control_port_protocol =
519 master->control_port_protocol;
520 sdata->control_port_no_encrypt =
521 master->control_port_no_encrypt;
522 sdata->vif.cab_queue = master->vif.cab_queue;
523 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
524 sizeof(sdata->vif.hw_queue));
525 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
526
527 mutex_lock(&local->key_mtx);
528 sdata->crypto_tx_tailroom_needed_cnt +=
529 master->crypto_tx_tailroom_needed_cnt;
530 mutex_unlock(&local->key_mtx);
531
532 break;
533 }
534 case NL80211_IFTYPE_AP:
535 sdata->bss = &sdata->u.ap;
536 break;
537 case NL80211_IFTYPE_MESH_POINT:
538 case NL80211_IFTYPE_STATION:
539 case NL80211_IFTYPE_MONITOR:
540 case NL80211_IFTYPE_ADHOC:
541 case NL80211_IFTYPE_P2P_DEVICE:
542 case NL80211_IFTYPE_OCB:
543 /* no special treatment */
544 break;
545 case NL80211_IFTYPE_UNSPECIFIED:
546 case NUM_NL80211_IFTYPES:
547 case NL80211_IFTYPE_P2P_CLIENT:
548 case NL80211_IFTYPE_P2P_GO:
549 /* cannot happen */
550 WARN_ON(1);
551 break;
552 }
553
554 if (local->open_count == 0) {
555 res = drv_start(local);
556 if (res)
557 goto err_del_bss;
558 /* we're brought up, everything changes */
559 hw_reconf_flags = ~0;
560 ieee80211_led_radio(local, true);
561 ieee80211_mod_tpt_led_trig(local,
562 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
563 }
564
565 /*
566 * Copy the hopefully now-present MAC address to
567 * this interface, if it has the special null one.
568 */
569 if (dev && is_zero_ether_addr(dev->dev_addr)) {
570 memcpy(dev->dev_addr,
571 local->hw.wiphy->perm_addr,
572 ETH_ALEN);
573 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
574
575 if (!is_valid_ether_addr(dev->dev_addr)) {
576 res = -EADDRNOTAVAIL;
577 goto err_stop;
578 }
579 }
580
581 switch (sdata->vif.type) {
582 case NL80211_IFTYPE_AP_VLAN:
583 /* no need to tell driver, but set carrier and chanctx */
584 if (rtnl_dereference(sdata->bss->beacon)) {
585 ieee80211_vif_vlan_copy_chanctx(sdata);
586 netif_carrier_on(dev);
587 } else {
588 netif_carrier_off(dev);
589 }
590 break;
591 case NL80211_IFTYPE_MONITOR:
592 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
593 local->cooked_mntrs++;
594 break;
595 }
596
597 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
598 res = drv_add_interface(local, sdata);
599 if (res)
600 goto err_stop;
601 } else if (local->monitors == 0 && local->open_count == 0) {
602 res = ieee80211_add_virtual_monitor(local);
603 if (res)
604 goto err_stop;
605 }
606
607 /* must be before the call to ieee80211_configure_filter */
608 local->monitors++;
609 if (local->monitors == 1) {
610 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
611 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
612 }
613
614 ieee80211_adjust_monitor_flags(sdata, 1);
615 ieee80211_configure_filter(local);
616 mutex_lock(&local->mtx);
617 ieee80211_recalc_idle(local);
618 mutex_unlock(&local->mtx);
619
620 netif_carrier_on(dev);
621 break;
622 default:
623 if (coming_up) {
624 ieee80211_del_virtual_monitor(local);
625
626 res = drv_add_interface(local, sdata);
627 if (res)
628 goto err_stop;
629 res = ieee80211_check_queues(sdata,
630 ieee80211_vif_type_p2p(&sdata->vif));
631 if (res)
632 goto err_del_interface;
633 }
634
635 if (sdata->vif.type == NL80211_IFTYPE_AP) {
636 local->fif_pspoll++;
637 local->fif_probe_req++;
638
639 ieee80211_configure_filter(local);
640 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
641 local->fif_probe_req++;
642 }
643
644 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
645 changed |= ieee80211_reset_erp_info(sdata);
646 ieee80211_bss_info_change_notify(sdata, changed);
647
648 switch (sdata->vif.type) {
649 case NL80211_IFTYPE_STATION:
650 case NL80211_IFTYPE_ADHOC:
651 case NL80211_IFTYPE_AP:
652 case NL80211_IFTYPE_MESH_POINT:
653 case NL80211_IFTYPE_OCB:
654 netif_carrier_off(dev);
655 break;
656 case NL80211_IFTYPE_WDS:
657 case NL80211_IFTYPE_P2P_DEVICE:
658 break;
659 default:
660 /* not reached */
661 WARN_ON(1);
662 }
663
664 /*
665 * Set default queue parameters so drivers don't
666 * need to initialise the hardware if the hardware
667 * doesn't start up with sane defaults.
668 * Enable QoS for anything but station interfaces.
669 */
670 ieee80211_set_wmm_default(sdata, true,
671 sdata->vif.type != NL80211_IFTYPE_STATION);
672 }
673
674 set_bit(SDATA_STATE_RUNNING, &sdata->state);
675
676 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
677 /* Create STA entry for the WDS peer */
678 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
679 GFP_KERNEL);
680 if (!sta) {
681 res = -ENOMEM;
682 goto err_del_interface;
683 }
684
685 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
686 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
687 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
688
689 res = sta_info_insert(sta);
690 if (res) {
691 /* STA has been freed */
692 goto err_del_interface;
693 }
694
695 rate_control_rate_init(sta);
696 netif_carrier_on(dev);
697 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
698 rcu_assign_pointer(local->p2p_sdata, sdata);
699 }
700
701 /*
702 * set_multicast_list will be invoked by the networking core
703 * which will check whether any increments here were done in
704 * error and sync them down to the hardware as filter flags.
705 */
706 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
707 atomic_inc(&local->iff_allmultis);
708
709 if (coming_up)
710 local->open_count++;
711
712 if (hw_reconf_flags)
713 ieee80211_hw_config(local, hw_reconf_flags);
714
715 ieee80211_recalc_ps(local);
716
717 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
718 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
719 /* XXX: for AP_VLAN, actually track AP queues */
720 netif_tx_start_all_queues(dev);
721 } else if (dev) {
722 unsigned long flags;
723 int n_acs = IEEE80211_NUM_ACS;
724 int ac;
725
726 if (local->hw.queues < IEEE80211_NUM_ACS)
727 n_acs = 1;
728
729 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
730 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
731 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
732 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
733 for (ac = 0; ac < n_acs; ac++) {
734 int ac_queue = sdata->vif.hw_queue[ac];
735
736 if (local->queue_stop_reasons[ac_queue] == 0 &&
737 skb_queue_empty(&local->pending[ac_queue]))
738 netif_start_subqueue(dev, ac);
739 }
740 }
741 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
742 }
743
744 return 0;
745 err_del_interface:
746 drv_remove_interface(local, sdata);
747 err_stop:
748 if (!local->open_count)
749 drv_stop(local);
750 err_del_bss:
751 sdata->bss = NULL;
752 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
753 mutex_lock(&local->mtx);
754 list_del(&sdata->u.vlan.list);
755 mutex_unlock(&local->mtx);
756 }
757 /* might already be clear but that doesn't matter */
758 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
759 return res;
760 }
761
ieee80211_open(struct net_device * dev)762 static int ieee80211_open(struct net_device *dev)
763 {
764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
765 int err;
766
767 /* fail early if user set an invalid address */
768 if (!is_valid_ether_addr(dev->dev_addr))
769 return -EADDRNOTAVAIL;
770
771 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
772 if (err)
773 return err;
774
775 return ieee80211_do_open(&sdata->wdev, true);
776 }
777
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)778 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
779 bool going_down)
780 {
781 struct ieee80211_local *local = sdata->local;
782 unsigned long flags;
783 struct sk_buff *skb, *tmp;
784 u32 hw_reconf_flags = 0;
785 int i, flushed;
786 struct ps_data *ps;
787 struct cfg80211_chan_def chandef;
788 bool cancel_scan;
789
790 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
791
792 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
793 if (cancel_scan)
794 ieee80211_scan_cancel(local);
795
796 /*
797 * Stop TX on this interface first.
798 */
799 if (sdata->dev)
800 netif_tx_stop_all_queues(sdata->dev);
801
802 ieee80211_roc_purge(local, sdata);
803
804 switch (sdata->vif.type) {
805 case NL80211_IFTYPE_STATION:
806 ieee80211_mgd_stop(sdata);
807 break;
808 case NL80211_IFTYPE_ADHOC:
809 ieee80211_ibss_stop(sdata);
810 break;
811 case NL80211_IFTYPE_AP:
812 cancel_work_sync(&sdata->u.ap.request_smps_work);
813 break;
814 default:
815 break;
816 }
817
818 /*
819 * Remove all stations associated with this interface.
820 *
821 * This must be done before calling ops->remove_interface()
822 * because otherwise we can later invoke ops->sta_notify()
823 * whenever the STAs are removed, and that invalidates driver
824 * assumptions about always getting a vif pointer that is valid
825 * (because if we remove a STA after ops->remove_interface()
826 * the driver will have removed the vif info already!)
827 *
828 * In WDS mode a station must exist here and be flushed, for
829 * AP_VLANs stations may exist since there's nothing else that
830 * would have removed them, but in other modes there shouldn't
831 * be any stations.
832 */
833 flushed = sta_info_flush(sdata);
834 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
835 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
836 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
837
838 /* don't count this interface for allmulti while it is down */
839 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
840 atomic_dec(&local->iff_allmultis);
841
842 if (sdata->vif.type == NL80211_IFTYPE_AP) {
843 local->fif_pspoll--;
844 local->fif_probe_req--;
845 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
846 local->fif_probe_req--;
847 }
848
849 if (sdata->dev) {
850 netif_addr_lock_bh(sdata->dev);
851 spin_lock_bh(&local->filter_lock);
852 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
853 sdata->dev->addr_len);
854 spin_unlock_bh(&local->filter_lock);
855 netif_addr_unlock_bh(sdata->dev);
856 }
857
858 del_timer_sync(&local->dynamic_ps_timer);
859 cancel_work_sync(&local->dynamic_ps_enable_work);
860
861 cancel_work_sync(&sdata->recalc_smps);
862 sdata_lock(sdata);
863 mutex_lock(&local->mtx);
864 sdata->vif.csa_active = false;
865 if (sdata->vif.type == NL80211_IFTYPE_STATION)
866 sdata->u.mgd.csa_waiting_bcn = false;
867 if (sdata->csa_block_tx) {
868 ieee80211_wake_vif_queues(local, sdata,
869 IEEE80211_QUEUE_STOP_REASON_CSA);
870 sdata->csa_block_tx = false;
871 }
872 mutex_unlock(&local->mtx);
873 sdata_unlock(sdata);
874
875 cancel_work_sync(&sdata->csa_finalize_work);
876
877 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
878
879 if (sdata->wdev.cac_started) {
880 chandef = sdata->vif.bss_conf.chandef;
881 WARN_ON(local->suspended);
882 mutex_lock(&local->mtx);
883 ieee80211_vif_release_channel(sdata);
884 mutex_unlock(&local->mtx);
885 cfg80211_cac_event(sdata->dev, &chandef,
886 NL80211_RADAR_CAC_ABORTED,
887 GFP_KERNEL);
888 }
889
890 /* APs need special treatment */
891 if (sdata->vif.type == NL80211_IFTYPE_AP) {
892 struct ieee80211_sub_if_data *vlan, *tmpsdata;
893
894 /* down all dependent devices, that is VLANs */
895 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
896 u.vlan.list)
897 dev_close(vlan->dev);
898 WARN_ON(!list_empty(&sdata->u.ap.vlans));
899 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
900 /* remove all packets in parent bc_buf pointing to this dev */
901 ps = &sdata->bss->ps;
902
903 spin_lock_irqsave(&ps->bc_buf.lock, flags);
904 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
905 if (skb->dev == sdata->dev) {
906 __skb_unlink(skb, &ps->bc_buf);
907 local->total_ps_buffered--;
908 ieee80211_free_txskb(&local->hw, skb);
909 }
910 }
911 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
912 }
913
914 if (going_down)
915 local->open_count--;
916
917 switch (sdata->vif.type) {
918 case NL80211_IFTYPE_AP_VLAN:
919 mutex_lock(&local->mtx);
920 list_del(&sdata->u.vlan.list);
921 mutex_unlock(&local->mtx);
922 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
923 /* see comment in the default case below */
924 ieee80211_free_keys(sdata, true);
925 /* no need to tell driver */
926 break;
927 case NL80211_IFTYPE_MONITOR:
928 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
929 local->cooked_mntrs--;
930 break;
931 }
932
933 local->monitors--;
934 if (local->monitors == 0) {
935 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
936 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
937 }
938
939 ieee80211_adjust_monitor_flags(sdata, -1);
940 break;
941 case NL80211_IFTYPE_P2P_DEVICE:
942 /* relies on synchronize_rcu() below */
943 RCU_INIT_POINTER(local->p2p_sdata, NULL);
944 /* fall through */
945 default:
946 cancel_work_sync(&sdata->work);
947 /*
948 * When we get here, the interface is marked down.
949 * Free the remaining keys, if there are any
950 * (which can happen in AP mode if userspace sets
951 * keys before the interface is operating, and maybe
952 * also in WDS mode)
953 *
954 * Force the key freeing to always synchronize_net()
955 * to wait for the RX path in case it is using this
956 * interface enqueuing frames at this very time on
957 * another CPU.
958 */
959 ieee80211_free_keys(sdata, true);
960 skb_queue_purge(&sdata->skb_queue);
961 }
962
963 sdata->bss = NULL;
964
965 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
966 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
967 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
968 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
969 if (info->control.vif == &sdata->vif) {
970 __skb_unlink(skb, &local->pending[i]);
971 ieee80211_free_txskb(&local->hw, skb);
972 }
973 }
974 }
975 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
976
977 if (sdata->vif.txq) {
978 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
979
980 spin_lock_bh(&txqi->queue.lock);
981 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
982 spin_unlock_bh(&txqi->queue.lock);
983
984 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
985 }
986
987 if (local->open_count == 0)
988 ieee80211_clear_tx_pending(local);
989
990 /*
991 * If the interface goes down while suspended, presumably because
992 * the device was unplugged and that happens before our resume,
993 * then the driver is already unconfigured and the remainder of
994 * this function isn't needed.
995 * XXX: what about WoWLAN? If the device has software state, e.g.
996 * memory allocated, it might expect teardown commands from
997 * mac80211 here?
998 */
999 if (local->suspended) {
1000 WARN_ON(local->wowlan);
1001 WARN_ON(rtnl_dereference(local->monitor_sdata));
1002 return;
1003 }
1004
1005 switch (sdata->vif.type) {
1006 case NL80211_IFTYPE_AP_VLAN:
1007 break;
1008 case NL80211_IFTYPE_MONITOR:
1009 if (local->monitors == 0)
1010 ieee80211_del_virtual_monitor(local);
1011
1012 mutex_lock(&local->mtx);
1013 ieee80211_recalc_idle(local);
1014 mutex_unlock(&local->mtx);
1015
1016 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1017 break;
1018
1019 /* fall through */
1020 default:
1021 if (going_down)
1022 drv_remove_interface(local, sdata);
1023 }
1024
1025 ieee80211_recalc_ps(local);
1026
1027 if (cancel_scan)
1028 flush_delayed_work(&local->scan_work);
1029
1030 if (local->open_count == 0) {
1031 ieee80211_stop_device(local);
1032
1033 /* no reconfiguring after stop! */
1034 return;
1035 }
1036
1037 /* do after stop to avoid reconfiguring when we stop anyway */
1038 ieee80211_configure_filter(local);
1039 ieee80211_hw_config(local, hw_reconf_flags);
1040
1041 if (local->monitors == local->open_count)
1042 ieee80211_add_virtual_monitor(local);
1043 }
1044
ieee80211_stop(struct net_device * dev)1045 static int ieee80211_stop(struct net_device *dev)
1046 {
1047 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1048
1049 ieee80211_do_stop(sdata, true);
1050
1051 return 0;
1052 }
1053
ieee80211_set_multicast_list(struct net_device * dev)1054 static void ieee80211_set_multicast_list(struct net_device *dev)
1055 {
1056 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1057 struct ieee80211_local *local = sdata->local;
1058 int allmulti, sdata_allmulti;
1059
1060 allmulti = !!(dev->flags & IFF_ALLMULTI);
1061 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1062
1063 if (allmulti != sdata_allmulti) {
1064 if (dev->flags & IFF_ALLMULTI)
1065 atomic_inc(&local->iff_allmultis);
1066 else
1067 atomic_dec(&local->iff_allmultis);
1068 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1069 }
1070
1071 spin_lock_bh(&local->filter_lock);
1072 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1073 spin_unlock_bh(&local->filter_lock);
1074 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1075 }
1076
1077 /*
1078 * Called when the netdev is removed or, by the code below, before
1079 * the interface type changes.
1080 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)1081 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1082 {
1083 int i;
1084
1085 /* free extra data */
1086 ieee80211_free_keys(sdata, false);
1087
1088 ieee80211_debugfs_remove_netdev(sdata);
1089
1090 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1091 __skb_queue_purge(&sdata->fragments[i].skb_list);
1092 sdata->fragment_next = 0;
1093
1094 if (ieee80211_vif_is_mesh(&sdata->vif))
1095 mesh_rmc_free(sdata);
1096 }
1097
ieee80211_uninit(struct net_device * dev)1098 static void ieee80211_uninit(struct net_device *dev)
1099 {
1100 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1101 }
1102
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,void * accel_priv,select_queue_fallback_t fallback)1103 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1104 struct sk_buff *skb,
1105 void *accel_priv,
1106 select_queue_fallback_t fallback)
1107 {
1108 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1109 }
1110
1111 static struct rtnl_link_stats64 *
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)1112 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1113 {
1114 int i;
1115
1116 for_each_possible_cpu(i) {
1117 const struct pcpu_sw_netstats *tstats;
1118 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1119 unsigned int start;
1120
1121 tstats = per_cpu_ptr(dev->tstats, i);
1122
1123 do {
1124 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1125 rx_packets = tstats->rx_packets;
1126 tx_packets = tstats->tx_packets;
1127 rx_bytes = tstats->rx_bytes;
1128 tx_bytes = tstats->tx_bytes;
1129 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1130
1131 stats->rx_packets += rx_packets;
1132 stats->tx_packets += tx_packets;
1133 stats->rx_bytes += rx_bytes;
1134 stats->tx_bytes += tx_bytes;
1135 }
1136
1137 return stats;
1138 }
1139
1140 static const struct net_device_ops ieee80211_dataif_ops = {
1141 .ndo_open = ieee80211_open,
1142 .ndo_stop = ieee80211_stop,
1143 .ndo_uninit = ieee80211_uninit,
1144 .ndo_start_xmit = ieee80211_subif_start_xmit,
1145 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1146 .ndo_change_mtu = ieee80211_change_mtu,
1147 .ndo_set_mac_address = ieee80211_change_mac,
1148 .ndo_select_queue = ieee80211_netdev_select_queue,
1149 .ndo_get_stats64 = ieee80211_get_stats64,
1150 };
1151
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,void * accel_priv,select_queue_fallback_t fallback)1152 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1153 struct sk_buff *skb,
1154 void *accel_priv,
1155 select_queue_fallback_t fallback)
1156 {
1157 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1158 struct ieee80211_local *local = sdata->local;
1159 struct ieee80211_hdr *hdr;
1160 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1161
1162 if (local->hw.queues < IEEE80211_NUM_ACS)
1163 return 0;
1164
1165 if (skb->len < 4 ||
1166 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1167 return 0; /* doesn't matter, frame will be dropped */
1168
1169 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1170
1171 return ieee80211_select_queue_80211(sdata, skb, hdr);
1172 }
1173
1174 static const struct net_device_ops ieee80211_monitorif_ops = {
1175 .ndo_open = ieee80211_open,
1176 .ndo_stop = ieee80211_stop,
1177 .ndo_uninit = ieee80211_uninit,
1178 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1179 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1180 .ndo_change_mtu = ieee80211_change_mtu,
1181 .ndo_set_mac_address = ieee80211_change_mac,
1182 .ndo_select_queue = ieee80211_monitor_select_queue,
1183 .ndo_get_stats64 = ieee80211_get_stats64,
1184 };
1185
ieee80211_if_free(struct net_device * dev)1186 static void ieee80211_if_free(struct net_device *dev)
1187 {
1188 free_percpu(dev->tstats);
1189 free_netdev(dev);
1190 }
1191
ieee80211_if_setup(struct net_device * dev)1192 static void ieee80211_if_setup(struct net_device *dev)
1193 {
1194 ether_setup(dev);
1195 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1196 dev->netdev_ops = &ieee80211_dataif_ops;
1197 dev->destructor = ieee80211_if_free;
1198 }
1199
ieee80211_iface_work(struct work_struct * work)1200 static void ieee80211_iface_work(struct work_struct *work)
1201 {
1202 struct ieee80211_sub_if_data *sdata =
1203 container_of(work, struct ieee80211_sub_if_data, work);
1204 struct ieee80211_local *local = sdata->local;
1205 struct sk_buff *skb;
1206 struct sta_info *sta;
1207 struct ieee80211_ra_tid *ra_tid;
1208 struct ieee80211_rx_agg *rx_agg;
1209
1210 if (!ieee80211_sdata_running(sdata))
1211 return;
1212
1213 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1214 return;
1215
1216 if (!ieee80211_can_run_worker(local))
1217 return;
1218
1219 /* first process frames */
1220 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1221 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1222
1223 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1224 ra_tid = (void *)&skb->cb;
1225 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1226 ra_tid->tid);
1227 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1228 ra_tid = (void *)&skb->cb;
1229 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1230 ra_tid->tid);
1231 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1232 rx_agg = (void *)&skb->cb;
1233 mutex_lock(&local->sta_mtx);
1234 sta = sta_info_get_bss(sdata, rx_agg->addr);
1235 if (sta)
1236 __ieee80211_start_rx_ba_session(sta,
1237 0, 0, 0, 1, rx_agg->tid,
1238 IEEE80211_MAX_AMPDU_BUF,
1239 false, true);
1240 mutex_unlock(&local->sta_mtx);
1241 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1242 rx_agg = (void *)&skb->cb;
1243 mutex_lock(&local->sta_mtx);
1244 sta = sta_info_get_bss(sdata, rx_agg->addr);
1245 if (sta)
1246 __ieee80211_stop_rx_ba_session(sta,
1247 rx_agg->tid,
1248 WLAN_BACK_RECIPIENT, 0,
1249 false);
1250 mutex_unlock(&local->sta_mtx);
1251 } else if (ieee80211_is_action(mgmt->frame_control) &&
1252 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1253 int len = skb->len;
1254
1255 mutex_lock(&local->sta_mtx);
1256 sta = sta_info_get_bss(sdata, mgmt->sa);
1257 if (sta) {
1258 switch (mgmt->u.action.u.addba_req.action_code) {
1259 case WLAN_ACTION_ADDBA_REQ:
1260 ieee80211_process_addba_request(
1261 local, sta, mgmt, len);
1262 break;
1263 case WLAN_ACTION_ADDBA_RESP:
1264 ieee80211_process_addba_resp(local, sta,
1265 mgmt, len);
1266 break;
1267 case WLAN_ACTION_DELBA:
1268 ieee80211_process_delba(sdata, sta,
1269 mgmt, len);
1270 break;
1271 default:
1272 WARN_ON(1);
1273 break;
1274 }
1275 }
1276 mutex_unlock(&local->sta_mtx);
1277 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1278 struct ieee80211_hdr *hdr = (void *)mgmt;
1279 /*
1280 * So the frame isn't mgmt, but frame_control
1281 * is at the right place anyway, of course, so
1282 * the if statement is correct.
1283 *
1284 * Warn if we have other data frame types here,
1285 * they must not get here.
1286 */
1287 WARN_ON(hdr->frame_control &
1288 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1289 WARN_ON(!(hdr->seq_ctrl &
1290 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1291 /*
1292 * This was a fragment of a frame, received while
1293 * a block-ack session was active. That cannot be
1294 * right, so terminate the session.
1295 */
1296 mutex_lock(&local->sta_mtx);
1297 sta = sta_info_get_bss(sdata, mgmt->sa);
1298 if (sta) {
1299 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1300 IEEE80211_QOS_CTL_TID_MASK;
1301
1302 __ieee80211_stop_rx_ba_session(
1303 sta, tid, WLAN_BACK_RECIPIENT,
1304 WLAN_REASON_QSTA_REQUIRE_SETUP,
1305 true);
1306 }
1307 mutex_unlock(&local->sta_mtx);
1308 } else switch (sdata->vif.type) {
1309 case NL80211_IFTYPE_STATION:
1310 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1311 break;
1312 case NL80211_IFTYPE_ADHOC:
1313 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1314 break;
1315 case NL80211_IFTYPE_MESH_POINT:
1316 if (!ieee80211_vif_is_mesh(&sdata->vif))
1317 break;
1318 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1319 break;
1320 default:
1321 WARN(1, "frame for unexpected interface type");
1322 break;
1323 }
1324
1325 kfree_skb(skb);
1326 }
1327
1328 /* then other type-dependent work */
1329 switch (sdata->vif.type) {
1330 case NL80211_IFTYPE_STATION:
1331 ieee80211_sta_work(sdata);
1332 break;
1333 case NL80211_IFTYPE_ADHOC:
1334 ieee80211_ibss_work(sdata);
1335 break;
1336 case NL80211_IFTYPE_MESH_POINT:
1337 if (!ieee80211_vif_is_mesh(&sdata->vif))
1338 break;
1339 ieee80211_mesh_work(sdata);
1340 break;
1341 case NL80211_IFTYPE_OCB:
1342 ieee80211_ocb_work(sdata);
1343 break;
1344 default:
1345 break;
1346 }
1347 }
1348
ieee80211_recalc_smps_work(struct work_struct * work)1349 static void ieee80211_recalc_smps_work(struct work_struct *work)
1350 {
1351 struct ieee80211_sub_if_data *sdata =
1352 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1353
1354 ieee80211_recalc_smps(sdata);
1355 }
1356
1357 /*
1358 * Helper function to initialise an interface to a specific type.
1359 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1360 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1361 enum nl80211_iftype type)
1362 {
1363 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1364 0xff, 0xff, 0xff};
1365
1366 /* clear type-dependent union */
1367 memset(&sdata->u, 0, sizeof(sdata->u));
1368
1369 /* and set some type-dependent values */
1370 sdata->vif.type = type;
1371 sdata->vif.p2p = false;
1372 sdata->wdev.iftype = type;
1373
1374 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1375 sdata->control_port_no_encrypt = false;
1376 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1377 sdata->vif.bss_conf.idle = true;
1378
1379 sdata->noack_map = 0;
1380
1381 /* only monitor/p2p-device differ */
1382 if (sdata->dev) {
1383 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1384 sdata->dev->type = ARPHRD_ETHER;
1385 }
1386
1387 skb_queue_head_init(&sdata->skb_queue);
1388 INIT_WORK(&sdata->work, ieee80211_iface_work);
1389 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1390 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1391 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1392 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1393
1394 switch (type) {
1395 case NL80211_IFTYPE_P2P_GO:
1396 type = NL80211_IFTYPE_AP;
1397 sdata->vif.type = type;
1398 sdata->vif.p2p = true;
1399 /* fall through */
1400 case NL80211_IFTYPE_AP:
1401 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1402 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1403 INIT_WORK(&sdata->u.ap.request_smps_work,
1404 ieee80211_request_smps_ap_work);
1405 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1406 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1407 break;
1408 case NL80211_IFTYPE_P2P_CLIENT:
1409 type = NL80211_IFTYPE_STATION;
1410 sdata->vif.type = type;
1411 sdata->vif.p2p = true;
1412 /* fall through */
1413 case NL80211_IFTYPE_STATION:
1414 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1415 ieee80211_sta_setup_sdata(sdata);
1416 break;
1417 case NL80211_IFTYPE_OCB:
1418 sdata->vif.bss_conf.bssid = bssid_wildcard;
1419 ieee80211_ocb_setup_sdata(sdata);
1420 break;
1421 case NL80211_IFTYPE_ADHOC:
1422 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1423 ieee80211_ibss_setup_sdata(sdata);
1424 break;
1425 case NL80211_IFTYPE_MESH_POINT:
1426 if (ieee80211_vif_is_mesh(&sdata->vif))
1427 ieee80211_mesh_init_sdata(sdata);
1428 break;
1429 case NL80211_IFTYPE_MONITOR:
1430 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1431 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1432 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1433 MONITOR_FLAG_OTHER_BSS;
1434 break;
1435 case NL80211_IFTYPE_WDS:
1436 sdata->vif.bss_conf.bssid = NULL;
1437 break;
1438 case NL80211_IFTYPE_AP_VLAN:
1439 case NL80211_IFTYPE_P2P_DEVICE:
1440 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1441 break;
1442 case NL80211_IFTYPE_UNSPECIFIED:
1443 case NUM_NL80211_IFTYPES:
1444 BUG();
1445 break;
1446 }
1447
1448 ieee80211_debugfs_add_netdev(sdata);
1449 }
1450
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1451 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1452 enum nl80211_iftype type)
1453 {
1454 struct ieee80211_local *local = sdata->local;
1455 int ret, err;
1456 enum nl80211_iftype internal_type = type;
1457 bool p2p = false;
1458
1459 ASSERT_RTNL();
1460
1461 if (!local->ops->change_interface)
1462 return -EBUSY;
1463
1464 switch (sdata->vif.type) {
1465 case NL80211_IFTYPE_AP:
1466 case NL80211_IFTYPE_STATION:
1467 case NL80211_IFTYPE_ADHOC:
1468 case NL80211_IFTYPE_OCB:
1469 /*
1470 * Could maybe also all others here?
1471 * Just not sure how that interacts
1472 * with the RX/config path e.g. for
1473 * mesh.
1474 */
1475 break;
1476 default:
1477 return -EBUSY;
1478 }
1479
1480 switch (type) {
1481 case NL80211_IFTYPE_AP:
1482 case NL80211_IFTYPE_STATION:
1483 case NL80211_IFTYPE_ADHOC:
1484 case NL80211_IFTYPE_OCB:
1485 /*
1486 * Could probably support everything
1487 * but WDS here (WDS do_open can fail
1488 * under memory pressure, which this
1489 * code isn't prepared to handle).
1490 */
1491 break;
1492 case NL80211_IFTYPE_P2P_CLIENT:
1493 p2p = true;
1494 internal_type = NL80211_IFTYPE_STATION;
1495 break;
1496 case NL80211_IFTYPE_P2P_GO:
1497 p2p = true;
1498 internal_type = NL80211_IFTYPE_AP;
1499 break;
1500 default:
1501 return -EBUSY;
1502 }
1503
1504 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1505 if (ret)
1506 return ret;
1507
1508 ieee80211_do_stop(sdata, false);
1509
1510 ieee80211_teardown_sdata(sdata);
1511
1512 ret = drv_change_interface(local, sdata, internal_type, p2p);
1513 if (ret)
1514 type = ieee80211_vif_type_p2p(&sdata->vif);
1515
1516 /*
1517 * Ignore return value here, there's not much we can do since
1518 * the driver changed the interface type internally already.
1519 * The warnings will hopefully make driver authors fix it :-)
1520 */
1521 ieee80211_check_queues(sdata, type);
1522
1523 ieee80211_setup_sdata(sdata, type);
1524
1525 err = ieee80211_do_open(&sdata->wdev, false);
1526 WARN(err, "type change: do_open returned %d", err);
1527
1528 return ret;
1529 }
1530
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1531 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1532 enum nl80211_iftype type)
1533 {
1534 int ret;
1535
1536 ASSERT_RTNL();
1537
1538 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1539 return 0;
1540
1541 if (ieee80211_sdata_running(sdata)) {
1542 ret = ieee80211_runtime_change_iftype(sdata, type);
1543 if (ret)
1544 return ret;
1545 } else {
1546 /* Purge and reset type-dependent state. */
1547 ieee80211_teardown_sdata(sdata);
1548 ieee80211_setup_sdata(sdata, type);
1549 }
1550
1551 /* reset some values that shouldn't be kept across type changes */
1552 if (type == NL80211_IFTYPE_STATION)
1553 sdata->u.mgd.use_4addr = false;
1554
1555 return 0;
1556 }
1557
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1558 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1559 u8 *perm_addr, enum nl80211_iftype type)
1560 {
1561 struct ieee80211_sub_if_data *sdata;
1562 u64 mask, start, addr, val, inc;
1563 u8 *m;
1564 u8 tmp_addr[ETH_ALEN];
1565 int i;
1566
1567 /* default ... something at least */
1568 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1569
1570 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1571 local->hw.wiphy->n_addresses <= 1)
1572 return;
1573
1574 mutex_lock(&local->iflist_mtx);
1575
1576 switch (type) {
1577 case NL80211_IFTYPE_MONITOR:
1578 /* doesn't matter */
1579 break;
1580 case NL80211_IFTYPE_WDS:
1581 case NL80211_IFTYPE_AP_VLAN:
1582 /* match up with an AP interface */
1583 list_for_each_entry(sdata, &local->interfaces, list) {
1584 if (sdata->vif.type != NL80211_IFTYPE_AP)
1585 continue;
1586 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1587 break;
1588 }
1589 /* keep default if no AP interface present */
1590 break;
1591 case NL80211_IFTYPE_P2P_CLIENT:
1592 case NL80211_IFTYPE_P2P_GO:
1593 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1594 list_for_each_entry(sdata, &local->interfaces, list) {
1595 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1596 continue;
1597 if (!ieee80211_sdata_running(sdata))
1598 continue;
1599 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1600 goto out_unlock;
1601 }
1602 }
1603 /* otherwise fall through */
1604 default:
1605 /* assign a new address if possible -- try n_addresses first */
1606 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1607 bool used = false;
1608
1609 list_for_each_entry(sdata, &local->interfaces, list) {
1610 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1611 sdata->vif.addr)) {
1612 used = true;
1613 break;
1614 }
1615 }
1616
1617 if (!used) {
1618 memcpy(perm_addr,
1619 local->hw.wiphy->addresses[i].addr,
1620 ETH_ALEN);
1621 break;
1622 }
1623 }
1624
1625 /* try mask if available */
1626 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1627 break;
1628
1629 m = local->hw.wiphy->addr_mask;
1630 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1631 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1632 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1633
1634 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1635 /* not a contiguous mask ... not handled now! */
1636 pr_info("not contiguous\n");
1637 break;
1638 }
1639
1640 /*
1641 * Pick address of existing interface in case user changed
1642 * MAC address manually, default to perm_addr.
1643 */
1644 m = local->hw.wiphy->perm_addr;
1645 list_for_each_entry(sdata, &local->interfaces, list) {
1646 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1647 continue;
1648 m = sdata->vif.addr;
1649 break;
1650 }
1651 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1652 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1653 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1654
1655 inc = 1ULL<<__ffs64(mask);
1656 val = (start & mask);
1657 addr = (start & ~mask) | (val & mask);
1658 do {
1659 bool used = false;
1660
1661 tmp_addr[5] = addr >> 0*8;
1662 tmp_addr[4] = addr >> 1*8;
1663 tmp_addr[3] = addr >> 2*8;
1664 tmp_addr[2] = addr >> 3*8;
1665 tmp_addr[1] = addr >> 4*8;
1666 tmp_addr[0] = addr >> 5*8;
1667
1668 val += inc;
1669
1670 list_for_each_entry(sdata, &local->interfaces, list) {
1671 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1672 used = true;
1673 break;
1674 }
1675 }
1676
1677 if (!used) {
1678 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1679 break;
1680 }
1681 addr = (start & ~mask) | (val & mask);
1682 } while (addr != start);
1683
1684 break;
1685 }
1686
1687 out_unlock:
1688 mutex_unlock(&local->iflist_mtx);
1689 }
1690
ieee80211_if_add(struct ieee80211_local * local,const char * name,unsigned char name_assign_type,struct wireless_dev ** new_wdev,enum nl80211_iftype type,struct vif_params * params)1691 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1692 unsigned char name_assign_type,
1693 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1694 struct vif_params *params)
1695 {
1696 struct net_device *ndev = NULL;
1697 struct ieee80211_sub_if_data *sdata = NULL;
1698 struct txq_info *txqi;
1699 int ret, i;
1700 int txqs = 1;
1701
1702 ASSERT_RTNL();
1703
1704 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1705 struct wireless_dev *wdev;
1706
1707 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1708 GFP_KERNEL);
1709 if (!sdata)
1710 return -ENOMEM;
1711 wdev = &sdata->wdev;
1712
1713 sdata->dev = NULL;
1714 strlcpy(sdata->name, name, IFNAMSIZ);
1715 ieee80211_assign_perm_addr(local, wdev->address, type);
1716 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1717 } else {
1718 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1719 sizeof(void *));
1720 int txq_size = 0;
1721
1722 if (local->ops->wake_tx_queue)
1723 txq_size += sizeof(struct txq_info) +
1724 local->hw.txq_data_size;
1725
1726 if (local->hw.queues >= IEEE80211_NUM_ACS)
1727 txqs = IEEE80211_NUM_ACS;
1728
1729 ndev = alloc_netdev_mqs(size + txq_size,
1730 name, name_assign_type,
1731 ieee80211_if_setup, txqs, 1);
1732 if (!ndev)
1733 return -ENOMEM;
1734 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1735
1736 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1737 if (!ndev->tstats) {
1738 free_netdev(ndev);
1739 return -ENOMEM;
1740 }
1741
1742 ndev->needed_headroom = local->tx_headroom +
1743 4*6 /* four MAC addresses */
1744 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1745 + 6 /* mesh */
1746 + 8 /* rfc1042/bridge tunnel */
1747 - ETH_HLEN /* ethernet hard_header_len */
1748 + IEEE80211_ENCRYPT_HEADROOM;
1749 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1750
1751 ret = dev_alloc_name(ndev, ndev->name);
1752 if (ret < 0) {
1753 ieee80211_if_free(ndev);
1754 return ret;
1755 }
1756
1757 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1758 if (params && is_valid_ether_addr(params->macaddr))
1759 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1760 else
1761 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1762 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1763
1764 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1765 sdata = netdev_priv(ndev);
1766 ndev->ieee80211_ptr = &sdata->wdev;
1767 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1768 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1769
1770 if (txq_size) {
1771 txqi = netdev_priv(ndev) + size;
1772 ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1773 }
1774
1775 sdata->dev = ndev;
1776 }
1777
1778 /* initialise type-independent data */
1779 sdata->wdev.wiphy = local->hw.wiphy;
1780 sdata->local = local;
1781
1782 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1783 skb_queue_head_init(&sdata->fragments[i].skb_list);
1784
1785 INIT_LIST_HEAD(&sdata->key_list);
1786
1787 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1788 ieee80211_dfs_cac_timer_work);
1789 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1790 ieee80211_delayed_tailroom_dec);
1791
1792 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1793 struct ieee80211_supported_band *sband;
1794 sband = local->hw.wiphy->bands[i];
1795 sdata->rc_rateidx_mask[i] =
1796 sband ? (1 << sband->n_bitrates) - 1 : 0;
1797 if (sband) {
1798 __le16 cap;
1799 u16 *vht_rate_mask;
1800
1801 memcpy(sdata->rc_rateidx_mcs_mask[i],
1802 sband->ht_cap.mcs.rx_mask,
1803 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1804
1805 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1806 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1807 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1808 } else {
1809 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1810 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1811 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1812 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1813 }
1814 }
1815
1816 ieee80211_set_default_queues(sdata);
1817
1818 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1819 sdata->user_power_level = local->user_power_level;
1820
1821 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1822
1823 /* setup type-dependent data */
1824 ieee80211_setup_sdata(sdata, type);
1825
1826 if (ndev) {
1827 if (params) {
1828 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1829 if (type == NL80211_IFTYPE_STATION)
1830 sdata->u.mgd.use_4addr = params->use_4addr;
1831 }
1832
1833 ndev->features |= local->hw.netdev_features;
1834
1835 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1836
1837 ret = register_netdevice(ndev);
1838 if (ret) {
1839 ieee80211_if_free(ndev);
1840 return ret;
1841 }
1842 }
1843
1844 mutex_lock(&local->iflist_mtx);
1845 list_add_tail_rcu(&sdata->list, &local->interfaces);
1846 mutex_unlock(&local->iflist_mtx);
1847
1848 if (new_wdev)
1849 *new_wdev = &sdata->wdev;
1850
1851 return 0;
1852 }
1853
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)1854 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1855 {
1856 ASSERT_RTNL();
1857
1858 mutex_lock(&sdata->local->iflist_mtx);
1859 list_del_rcu(&sdata->list);
1860 mutex_unlock(&sdata->local->iflist_mtx);
1861
1862 synchronize_rcu();
1863
1864 if (sdata->dev) {
1865 unregister_netdevice(sdata->dev);
1866 } else {
1867 cfg80211_unregister_wdev(&sdata->wdev);
1868 ieee80211_teardown_sdata(sdata);
1869 kfree(sdata);
1870 }
1871 }
1872
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)1873 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1874 {
1875 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1876 return;
1877 ieee80211_do_stop(sdata, true);
1878 }
1879
ieee80211_remove_interfaces(struct ieee80211_local * local)1880 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1881 {
1882 struct ieee80211_sub_if_data *sdata, *tmp;
1883 LIST_HEAD(unreg_list);
1884 LIST_HEAD(wdev_list);
1885
1886 ASSERT_RTNL();
1887
1888 /* Before destroying the interfaces, make sure they're all stopped so
1889 * that the hardware is stopped. Otherwise, the driver might still be
1890 * iterating the interfaces during the shutdown, e.g. from a worker
1891 * or from RX processing or similar, and if it does so (using atomic
1892 * iteration) while we're manipulating the list, the iteration will
1893 * crash.
1894 *
1895 * After this, the hardware should be stopped and the driver should
1896 * have stopped all of its activities, so that we can do RCU-unaware
1897 * manipulations of the interface list below.
1898 */
1899 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1900
1901 WARN(local->open_count, "%s: open count remains %d\n",
1902 wiphy_name(local->hw.wiphy), local->open_count);
1903
1904 mutex_lock(&local->iflist_mtx);
1905 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1906 list_del(&sdata->list);
1907
1908 if (sdata->dev)
1909 unregister_netdevice_queue(sdata->dev, &unreg_list);
1910 else
1911 list_add(&sdata->list, &wdev_list);
1912 }
1913 mutex_unlock(&local->iflist_mtx);
1914 unregister_netdevice_many(&unreg_list);
1915
1916 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1917 list_del(&sdata->list);
1918 cfg80211_unregister_wdev(&sdata->wdev);
1919 kfree(sdata);
1920 }
1921 }
1922
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)1923 static int netdev_notify(struct notifier_block *nb,
1924 unsigned long state, void *ptr)
1925 {
1926 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1927 struct ieee80211_sub_if_data *sdata;
1928
1929 if (state != NETDEV_CHANGENAME)
1930 return NOTIFY_DONE;
1931
1932 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1933 return NOTIFY_DONE;
1934
1935 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1936 return NOTIFY_DONE;
1937
1938 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1939 memcpy(sdata->name, dev->name, IFNAMSIZ);
1940 ieee80211_debugfs_rename_netdev(sdata);
1941
1942 return NOTIFY_OK;
1943 }
1944
1945 static struct notifier_block mac80211_netdev_notifier = {
1946 .notifier_call = netdev_notify,
1947 };
1948
ieee80211_iface_init(void)1949 int ieee80211_iface_init(void)
1950 {
1951 return register_netdevice_notifier(&mac80211_netdev_notifier);
1952 }
1953
ieee80211_iface_exit(void)1954 void ieee80211_iface_exit(void)
1955 {
1956 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1957 }
1958