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 * Copyright (c) 2016 Intel Deutschland GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/if_arp.h>
18 #include <linux/netdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "sta_info.h"
24 #include "debugfs_netdev.h"
25 #include "mesh.h"
26 #include "led.h"
27 #include "driver-ops.h"
28 #include "wme.h"
29 #include "rate.h"
30
31 /**
32 * DOC: Interface list locking
33 *
34 * The interface list in each struct ieee80211_local is protected
35 * three-fold:
36 *
37 * (1) modifications may only be done under the RTNL
38 * (2) modifications and readers are protected against each other by
39 * the iflist_mtx.
40 * (3) modifications are done in an RCU manner so atomic readers
41 * can traverse the list in RCU-safe blocks.
42 *
43 * As a consequence, reads (traversals) of the list can be protected
44 * by either the RTNL, the iflist_mtx or RCU.
45 */
46
47 static void ieee80211_iface_work(struct work_struct *work);
48
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
50 {
51 struct ieee80211_chanctx_conf *chanctx_conf;
52 int power;
53
54 rcu_read_lock();
55 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
56 if (!chanctx_conf) {
57 rcu_read_unlock();
58 return false;
59 }
60
61 power = ieee80211_chandef_max_power(&chanctx_conf->def);
62 rcu_read_unlock();
63
64 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
65 power = min(power, sdata->user_power_level);
66
67 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
68 power = min(power, sdata->ap_power_level);
69
70 if (power != sdata->vif.bss_conf.txpower) {
71 sdata->vif.bss_conf.txpower = power;
72 ieee80211_hw_config(sdata->local, 0);
73 return true;
74 }
75
76 return false;
77 }
78
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
80 bool update_bss)
81 {
82 if (__ieee80211_recalc_txpower(sdata) ||
83 (update_bss && ieee80211_sdata_running(sdata)))
84 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
85 }
86
__ieee80211_idle_off(struct ieee80211_local * local)87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
88 {
89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
90 return 0;
91
92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
93 return IEEE80211_CONF_CHANGE_IDLE;
94 }
95
__ieee80211_idle_on(struct ieee80211_local * local)96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
97 {
98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
99 return 0;
100
101 ieee80211_flush_queues(local, NULL, false);
102
103 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104 return IEEE80211_CONF_CHANGE_IDLE;
105 }
106
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108 bool force_active)
109 {
110 bool working, scanning, active;
111 unsigned int led_trig_start = 0, led_trig_stop = 0;
112
113 lockdep_assert_held(&local->mtx);
114
115 active = force_active ||
116 !list_empty(&local->chanctx_list) ||
117 local->monitors;
118
119 working = !local->ops->remain_on_channel &&
120 !list_empty(&local->roc_list);
121
122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124
125 if (working || scanning)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129
130 if (active)
131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 else
133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134
135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136
137 if (working || scanning || active)
138 return __ieee80211_idle_off(local);
139 return __ieee80211_idle_on(local);
140 }
141
ieee80211_idle_off(struct ieee80211_local * local)142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144 return __ieee80211_recalc_idle(local, true);
145 }
146
ieee80211_recalc_idle(struct ieee80211_local * local)147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149 u32 change = __ieee80211_recalc_idle(local, false);
150 if (change)
151 ieee80211_hw_config(local, change);
152 }
153
ieee80211_change_mtu(struct net_device * dev,int new_mtu)154 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
155 {
156 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
157 return -EINVAL;
158
159 dev->mtu = new_mtu;
160 return 0;
161 }
162
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)163 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
164 bool check_dup)
165 {
166 struct ieee80211_local *local = sdata->local;
167 struct ieee80211_sub_if_data *iter;
168 u64 new, mask, tmp;
169 u8 *m;
170 int ret = 0;
171
172 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
173 return 0;
174
175 m = addr;
176 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
177 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
178 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
179
180 m = local->hw.wiphy->addr_mask;
181 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
182 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
183 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
184
185 if (!check_dup)
186 return ret;
187
188 mutex_lock(&local->iflist_mtx);
189 list_for_each_entry(iter, &local->interfaces, list) {
190 if (iter == sdata)
191 continue;
192
193 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
194 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
195 continue;
196
197 m = iter->vif.addr;
198 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
199 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
200 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
201
202 if ((new & ~mask) != (tmp & ~mask)) {
203 ret = -EINVAL;
204 break;
205 }
206 }
207 mutex_unlock(&local->iflist_mtx);
208
209 return ret;
210 }
211
ieee80211_change_mac(struct net_device * dev,void * addr)212 static int ieee80211_change_mac(struct net_device *dev, void *addr)
213 {
214 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
215 struct sockaddr *sa = addr;
216 bool check_dup = true;
217 int ret;
218
219 if (ieee80211_sdata_running(sdata))
220 return -EBUSY;
221
222 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
223 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
224 check_dup = false;
225
226 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
227 if (ret)
228 return ret;
229
230 ret = eth_mac_addr(dev, sa);
231
232 if (ret == 0)
233 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
234
235 return ret;
236 }
237
identical_mac_addr_allowed(int type1,int type2)238 static inline int identical_mac_addr_allowed(int type1, int type2)
239 {
240 return type1 == NL80211_IFTYPE_MONITOR ||
241 type2 == NL80211_IFTYPE_MONITOR ||
242 type1 == NL80211_IFTYPE_P2P_DEVICE ||
243 type2 == NL80211_IFTYPE_P2P_DEVICE ||
244 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
245 (type1 == NL80211_IFTYPE_WDS &&
246 (type2 == NL80211_IFTYPE_WDS ||
247 type2 == NL80211_IFTYPE_AP)) ||
248 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
249 (type1 == NL80211_IFTYPE_AP_VLAN &&
250 (type2 == NL80211_IFTYPE_AP ||
251 type2 == NL80211_IFTYPE_AP_VLAN));
252 }
253
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)254 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
255 enum nl80211_iftype iftype)
256 {
257 struct ieee80211_local *local = sdata->local;
258 struct ieee80211_sub_if_data *nsdata;
259 int ret;
260
261 ASSERT_RTNL();
262
263 /* we hold the RTNL here so can safely walk the list */
264 list_for_each_entry(nsdata, &local->interfaces, list) {
265 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
266 /*
267 * Only OCB and monitor mode may coexist
268 */
269 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
270 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
271 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
272 nsdata->vif.type == NL80211_IFTYPE_OCB))
273 return -EBUSY;
274
275 /*
276 * Allow only a single IBSS interface to be up at any
277 * time. This is restricted because beacon distribution
278 * cannot work properly if both are in the same IBSS.
279 *
280 * To remove this restriction we'd have to disallow them
281 * from setting the same SSID on different IBSS interfaces
282 * belonging to the same hardware. Then, however, we're
283 * faced with having to adopt two different TSF timers...
284 */
285 if (iftype == NL80211_IFTYPE_ADHOC &&
286 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
287 return -EBUSY;
288 /*
289 * will not add another interface while any channel
290 * switch is active.
291 */
292 if (nsdata->vif.csa_active)
293 return -EBUSY;
294
295 /*
296 * The remaining checks are only performed for interfaces
297 * with the same MAC address.
298 */
299 if (!ether_addr_equal(sdata->vif.addr,
300 nsdata->vif.addr))
301 continue;
302
303 /*
304 * check whether it may have the same address
305 */
306 if (!identical_mac_addr_allowed(iftype,
307 nsdata->vif.type))
308 return -ENOTUNIQ;
309
310 /*
311 * can only add VLANs to enabled APs
312 */
313 if (iftype == NL80211_IFTYPE_AP_VLAN &&
314 nsdata->vif.type == NL80211_IFTYPE_AP)
315 sdata->bss = &nsdata->u.ap;
316 }
317 }
318
319 mutex_lock(&local->chanctx_mtx);
320 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
321 mutex_unlock(&local->chanctx_mtx);
322 return ret;
323 }
324
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)325 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
326 enum nl80211_iftype iftype)
327 {
328 int n_queues = sdata->local->hw.queues;
329 int i;
330
331 if (iftype == NL80211_IFTYPE_NAN)
332 return 0;
333
334 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
335 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
336 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
337 IEEE80211_INVAL_HW_QUEUE))
338 return -EINVAL;
339 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
340 n_queues))
341 return -EINVAL;
342 }
343 }
344
345 if ((iftype != NL80211_IFTYPE_AP &&
346 iftype != NL80211_IFTYPE_P2P_GO &&
347 iftype != NL80211_IFTYPE_MESH_POINT) ||
348 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
349 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
350 return 0;
351 }
352
353 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
354 return -EINVAL;
355
356 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
357 return -EINVAL;
358
359 return 0;
360 }
361
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)362 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
363 const int offset)
364 {
365 struct ieee80211_local *local = sdata->local;
366 u32 flags = sdata->u.mntr.flags;
367
368 #define ADJUST(_f, _s) do { \
369 if (flags & MONITOR_FLAG_##_f) \
370 local->fif_##_s += offset; \
371 } while (0)
372
373 ADJUST(FCSFAIL, fcsfail);
374 ADJUST(PLCPFAIL, plcpfail);
375 ADJUST(CONTROL, control);
376 ADJUST(CONTROL, pspoll);
377 ADJUST(OTHER_BSS, other_bss);
378
379 #undef ADJUST
380 }
381
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)382 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
383 {
384 struct ieee80211_local *local = sdata->local;
385 int i;
386
387 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
388 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
389 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
390 else if (local->hw.queues >= IEEE80211_NUM_ACS)
391 sdata->vif.hw_queue[i] = i;
392 else
393 sdata->vif.hw_queue[i] = 0;
394 }
395 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
396 }
397
ieee80211_add_virtual_monitor(struct ieee80211_local * local)398 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
399 {
400 struct ieee80211_sub_if_data *sdata;
401 int ret;
402
403 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
404 return 0;
405
406 ASSERT_RTNL();
407
408 if (local->monitor_sdata)
409 return 0;
410
411 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
412 if (!sdata)
413 return -ENOMEM;
414
415 /* set up data */
416 sdata->local = local;
417 sdata->vif.type = NL80211_IFTYPE_MONITOR;
418 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
419 wiphy_name(local->hw.wiphy));
420 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
421
422 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
423
424 ieee80211_set_default_queues(sdata);
425
426 ret = drv_add_interface(local, sdata);
427 if (WARN_ON(ret)) {
428 /* ok .. stupid driver, it asked for this! */
429 kfree(sdata);
430 return ret;
431 }
432
433 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
434 if (ret) {
435 kfree(sdata);
436 return ret;
437 }
438
439 mutex_lock(&local->iflist_mtx);
440 rcu_assign_pointer(local->monitor_sdata, sdata);
441 mutex_unlock(&local->iflist_mtx);
442
443 mutex_lock(&local->mtx);
444 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
445 IEEE80211_CHANCTX_EXCLUSIVE);
446 mutex_unlock(&local->mtx);
447 if (ret) {
448 mutex_lock(&local->iflist_mtx);
449 RCU_INIT_POINTER(local->monitor_sdata, NULL);
450 mutex_unlock(&local->iflist_mtx);
451 synchronize_net();
452 drv_remove_interface(local, sdata);
453 kfree(sdata);
454 return ret;
455 }
456
457 skb_queue_head_init(&sdata->skb_queue);
458 INIT_WORK(&sdata->work, ieee80211_iface_work);
459
460 return 0;
461 }
462
ieee80211_del_virtual_monitor(struct ieee80211_local * local)463 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
464 {
465 struct ieee80211_sub_if_data *sdata;
466
467 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
468 return;
469
470 ASSERT_RTNL();
471
472 mutex_lock(&local->iflist_mtx);
473
474 sdata = rcu_dereference_protected(local->monitor_sdata,
475 lockdep_is_held(&local->iflist_mtx));
476 if (!sdata) {
477 mutex_unlock(&local->iflist_mtx);
478 return;
479 }
480
481 RCU_INIT_POINTER(local->monitor_sdata, NULL);
482 mutex_unlock(&local->iflist_mtx);
483
484 synchronize_net();
485
486 mutex_lock(&local->mtx);
487 ieee80211_vif_release_channel(sdata);
488 mutex_unlock(&local->mtx);
489
490 drv_remove_interface(local, sdata);
491
492 kfree(sdata);
493 }
494
495 /*
496 * NOTE: Be very careful when changing this function, it must NOT return
497 * an error on interface type changes that have been pre-checked, so most
498 * checks should be in ieee80211_check_concurrent_iface.
499 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)500 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
501 {
502 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
503 struct net_device *dev = wdev->netdev;
504 struct ieee80211_local *local = sdata->local;
505 struct sta_info *sta;
506 u32 changed = 0;
507 int res;
508 u32 hw_reconf_flags = 0;
509
510 switch (sdata->vif.type) {
511 case NL80211_IFTYPE_WDS:
512 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
513 return -ENOLINK;
514 break;
515 case NL80211_IFTYPE_AP_VLAN: {
516 struct ieee80211_sub_if_data *master;
517
518 if (!sdata->bss)
519 return -ENOLINK;
520
521 mutex_lock(&local->mtx);
522 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
523 mutex_unlock(&local->mtx);
524
525 master = container_of(sdata->bss,
526 struct ieee80211_sub_if_data, u.ap);
527 sdata->control_port_protocol =
528 master->control_port_protocol;
529 sdata->control_port_no_encrypt =
530 master->control_port_no_encrypt;
531 sdata->vif.cab_queue = master->vif.cab_queue;
532 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
533 sizeof(sdata->vif.hw_queue));
534 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
535
536 mutex_lock(&local->key_mtx);
537 sdata->crypto_tx_tailroom_needed_cnt +=
538 master->crypto_tx_tailroom_needed_cnt;
539 mutex_unlock(&local->key_mtx);
540
541 break;
542 }
543 case NL80211_IFTYPE_AP:
544 sdata->bss = &sdata->u.ap;
545 break;
546 case NL80211_IFTYPE_MESH_POINT:
547 case NL80211_IFTYPE_STATION:
548 case NL80211_IFTYPE_MONITOR:
549 case NL80211_IFTYPE_ADHOC:
550 case NL80211_IFTYPE_P2P_DEVICE:
551 case NL80211_IFTYPE_OCB:
552 case NL80211_IFTYPE_NAN:
553 /* no special treatment */
554 break;
555 case NL80211_IFTYPE_UNSPECIFIED:
556 case NUM_NL80211_IFTYPES:
557 case NL80211_IFTYPE_P2P_CLIENT:
558 case NL80211_IFTYPE_P2P_GO:
559 /* cannot happen */
560 WARN_ON(1);
561 break;
562 }
563
564 if (local->open_count == 0) {
565 res = drv_start(local);
566 if (res)
567 goto err_del_bss;
568 /* we're brought up, everything changes */
569 hw_reconf_flags = ~0;
570 ieee80211_led_radio(local, true);
571 ieee80211_mod_tpt_led_trig(local,
572 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
573 }
574
575 /*
576 * Copy the hopefully now-present MAC address to
577 * this interface, if it has the special null one.
578 */
579 if (dev && is_zero_ether_addr(dev->dev_addr)) {
580 memcpy(dev->dev_addr,
581 local->hw.wiphy->perm_addr,
582 ETH_ALEN);
583 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
584
585 if (!is_valid_ether_addr(dev->dev_addr)) {
586 res = -EADDRNOTAVAIL;
587 goto err_stop;
588 }
589 }
590
591 switch (sdata->vif.type) {
592 case NL80211_IFTYPE_AP_VLAN:
593 /* no need to tell driver, but set carrier and chanctx */
594 if (rtnl_dereference(sdata->bss->beacon)) {
595 ieee80211_vif_vlan_copy_chanctx(sdata);
596 netif_carrier_on(dev);
597 } else {
598 netif_carrier_off(dev);
599 }
600 break;
601 case NL80211_IFTYPE_MONITOR:
602 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
603 local->cooked_mntrs++;
604 break;
605 }
606
607 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
608 res = drv_add_interface(local, sdata);
609 if (res)
610 goto err_stop;
611 } else if (local->monitors == 0 && local->open_count == 0) {
612 res = ieee80211_add_virtual_monitor(local);
613 if (res)
614 goto err_stop;
615 }
616
617 /* must be before the call to ieee80211_configure_filter */
618 local->monitors++;
619 if (local->monitors == 1) {
620 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
621 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
622 }
623
624 ieee80211_adjust_monitor_flags(sdata, 1);
625 ieee80211_configure_filter(local);
626 mutex_lock(&local->mtx);
627 ieee80211_recalc_idle(local);
628 mutex_unlock(&local->mtx);
629
630 netif_carrier_on(dev);
631 break;
632 default:
633 if (coming_up) {
634 ieee80211_del_virtual_monitor(local);
635
636 res = drv_add_interface(local, sdata);
637 if (res)
638 goto err_stop;
639 res = ieee80211_check_queues(sdata,
640 ieee80211_vif_type_p2p(&sdata->vif));
641 if (res)
642 goto err_del_interface;
643 }
644
645 if (sdata->vif.type == NL80211_IFTYPE_AP) {
646 local->fif_pspoll++;
647 local->fif_probe_req++;
648
649 ieee80211_configure_filter(local);
650 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
651 local->fif_probe_req++;
652 }
653
654 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
655 sdata->vif.type != NL80211_IFTYPE_NAN)
656 changed |= ieee80211_reset_erp_info(sdata);
657 ieee80211_bss_info_change_notify(sdata, changed);
658
659 switch (sdata->vif.type) {
660 case NL80211_IFTYPE_STATION:
661 case NL80211_IFTYPE_ADHOC:
662 case NL80211_IFTYPE_AP:
663 case NL80211_IFTYPE_MESH_POINT:
664 case NL80211_IFTYPE_OCB:
665 netif_carrier_off(dev);
666 break;
667 case NL80211_IFTYPE_WDS:
668 case NL80211_IFTYPE_P2P_DEVICE:
669 case NL80211_IFTYPE_NAN:
670 break;
671 default:
672 /* not reached */
673 WARN_ON(1);
674 }
675
676 /*
677 * Set default queue parameters so drivers don't
678 * need to initialise the hardware if the hardware
679 * doesn't start up with sane defaults.
680 * Enable QoS for anything but station interfaces.
681 */
682 ieee80211_set_wmm_default(sdata, true,
683 sdata->vif.type != NL80211_IFTYPE_STATION);
684 }
685
686 set_bit(SDATA_STATE_RUNNING, &sdata->state);
687
688 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
689 /* Create STA entry for the WDS peer */
690 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
691 GFP_KERNEL);
692 if (!sta) {
693 res = -ENOMEM;
694 goto err_del_interface;
695 }
696
697 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
698 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
699 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
700
701 res = sta_info_insert(sta);
702 if (res) {
703 /* STA has been freed */
704 goto err_del_interface;
705 }
706
707 rate_control_rate_init(sta);
708 netif_carrier_on(dev);
709 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
710 rcu_assign_pointer(local->p2p_sdata, sdata);
711 }
712
713 /*
714 * set_multicast_list will be invoked by the networking core
715 * which will check whether any increments here were done in
716 * error and sync them down to the hardware as filter flags.
717 */
718 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
719 atomic_inc(&local->iff_allmultis);
720
721 if (coming_up)
722 local->open_count++;
723
724 if (hw_reconf_flags)
725 ieee80211_hw_config(local, hw_reconf_flags);
726
727 ieee80211_recalc_ps(local);
728
729 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
730 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
731 local->ops->wake_tx_queue) {
732 /* XXX: for AP_VLAN, actually track AP queues */
733 netif_tx_start_all_queues(dev);
734 } else if (dev) {
735 unsigned long flags;
736 int n_acs = IEEE80211_NUM_ACS;
737 int ac;
738
739 if (local->hw.queues < IEEE80211_NUM_ACS)
740 n_acs = 1;
741
742 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
743 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
744 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
745 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
746 for (ac = 0; ac < n_acs; ac++) {
747 int ac_queue = sdata->vif.hw_queue[ac];
748
749 if (local->queue_stop_reasons[ac_queue] == 0 &&
750 skb_queue_empty(&local->pending[ac_queue]))
751 netif_start_subqueue(dev, ac);
752 }
753 }
754 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
755 }
756
757 return 0;
758 err_del_interface:
759 drv_remove_interface(local, sdata);
760 err_stop:
761 if (!local->open_count)
762 drv_stop(local);
763 err_del_bss:
764 sdata->bss = NULL;
765 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
766 mutex_lock(&local->mtx);
767 list_del(&sdata->u.vlan.list);
768 mutex_unlock(&local->mtx);
769 }
770 /* might already be clear but that doesn't matter */
771 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
772 return res;
773 }
774
ieee80211_open(struct net_device * dev)775 static int ieee80211_open(struct net_device *dev)
776 {
777 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
778 int err;
779
780 /* fail early if user set an invalid address */
781 if (!is_valid_ether_addr(dev->dev_addr))
782 return -EADDRNOTAVAIL;
783
784 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
785 if (err)
786 return err;
787
788 return ieee80211_do_open(&sdata->wdev, true);
789 }
790
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)791 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
792 bool going_down)
793 {
794 struct ieee80211_sub_if_data *txq_sdata = sdata;
795 struct ieee80211_local *local = sdata->local;
796 struct fq *fq = &local->fq;
797 unsigned long flags;
798 struct sk_buff *skb, *tmp;
799 u32 hw_reconf_flags = 0;
800 int i, flushed;
801 struct ps_data *ps;
802 struct cfg80211_chan_def chandef;
803 bool cancel_scan;
804 struct cfg80211_nan_func *func;
805
806 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
807
808 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
809 if (cancel_scan)
810 ieee80211_scan_cancel(local);
811
812 /*
813 * Stop TX on this interface first.
814 */
815 if (sdata->dev)
816 netif_tx_stop_all_queues(sdata->dev);
817
818 ieee80211_roc_purge(local, sdata);
819
820 switch (sdata->vif.type) {
821 case NL80211_IFTYPE_STATION:
822 ieee80211_mgd_stop(sdata);
823 break;
824 case NL80211_IFTYPE_ADHOC:
825 ieee80211_ibss_stop(sdata);
826 break;
827 case NL80211_IFTYPE_AP:
828 cancel_work_sync(&sdata->u.ap.request_smps_work);
829 break;
830 default:
831 break;
832 }
833
834 /*
835 * Remove all stations associated with this interface.
836 *
837 * This must be done before calling ops->remove_interface()
838 * because otherwise we can later invoke ops->sta_notify()
839 * whenever the STAs are removed, and that invalidates driver
840 * assumptions about always getting a vif pointer that is valid
841 * (because if we remove a STA after ops->remove_interface()
842 * the driver will have removed the vif info already!)
843 *
844 * In WDS mode a station must exist here and be flushed, for
845 * AP_VLANs stations may exist since there's nothing else that
846 * would have removed them, but in other modes there shouldn't
847 * be any stations.
848 */
849 flushed = sta_info_flush(sdata);
850 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
851 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
852 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
853
854 /* don't count this interface for allmulti while it is down */
855 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
856 atomic_dec(&local->iff_allmultis);
857
858 if (sdata->vif.type == NL80211_IFTYPE_AP) {
859 local->fif_pspoll--;
860 local->fif_probe_req--;
861 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
862 local->fif_probe_req--;
863 }
864
865 if (sdata->dev) {
866 netif_addr_lock_bh(sdata->dev);
867 spin_lock_bh(&local->filter_lock);
868 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
869 sdata->dev->addr_len);
870 spin_unlock_bh(&local->filter_lock);
871 netif_addr_unlock_bh(sdata->dev);
872 }
873
874 del_timer_sync(&local->dynamic_ps_timer);
875 cancel_work_sync(&local->dynamic_ps_enable_work);
876
877 cancel_work_sync(&sdata->recalc_smps);
878 sdata_lock(sdata);
879 mutex_lock(&local->mtx);
880 sdata->vif.csa_active = false;
881 if (sdata->vif.type == NL80211_IFTYPE_STATION)
882 sdata->u.mgd.csa_waiting_bcn = false;
883 if (sdata->csa_block_tx) {
884 ieee80211_wake_vif_queues(local, sdata,
885 IEEE80211_QUEUE_STOP_REASON_CSA);
886 sdata->csa_block_tx = false;
887 }
888 mutex_unlock(&local->mtx);
889 sdata_unlock(sdata);
890
891 cancel_work_sync(&sdata->csa_finalize_work);
892
893 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
894
895 if (sdata->wdev.cac_started) {
896 chandef = sdata->vif.bss_conf.chandef;
897 WARN_ON(local->suspended);
898 mutex_lock(&local->mtx);
899 ieee80211_vif_release_channel(sdata);
900 mutex_unlock(&local->mtx);
901 cfg80211_cac_event(sdata->dev, &chandef,
902 NL80211_RADAR_CAC_ABORTED,
903 GFP_KERNEL);
904 }
905
906 /* APs need special treatment */
907 if (sdata->vif.type == NL80211_IFTYPE_AP) {
908 struct ieee80211_sub_if_data *vlan, *tmpsdata;
909
910 /* down all dependent devices, that is VLANs */
911 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
912 u.vlan.list)
913 dev_close(vlan->dev);
914 WARN_ON(!list_empty(&sdata->u.ap.vlans));
915 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
916 /* remove all packets in parent bc_buf pointing to this dev */
917 ps = &sdata->bss->ps;
918
919 spin_lock_irqsave(&ps->bc_buf.lock, flags);
920 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
921 if (skb->dev == sdata->dev) {
922 __skb_unlink(skb, &ps->bc_buf);
923 local->total_ps_buffered--;
924 ieee80211_free_txskb(&local->hw, skb);
925 }
926 }
927 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
928 }
929
930 if (going_down)
931 local->open_count--;
932
933 switch (sdata->vif.type) {
934 case NL80211_IFTYPE_AP_VLAN:
935 txq_sdata = container_of(sdata->bss,
936 struct ieee80211_sub_if_data, u.ap);
937
938 mutex_lock(&local->mtx);
939 list_del(&sdata->u.vlan.list);
940 mutex_unlock(&local->mtx);
941 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
942 /* see comment in the default case below */
943 ieee80211_free_keys(sdata, true);
944 /* no need to tell driver */
945 break;
946 case NL80211_IFTYPE_MONITOR:
947 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
948 local->cooked_mntrs--;
949 break;
950 }
951
952 local->monitors--;
953 if (local->monitors == 0) {
954 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
955 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
956 }
957
958 ieee80211_adjust_monitor_flags(sdata, -1);
959 break;
960 case NL80211_IFTYPE_NAN:
961 /* clean all the functions */
962 spin_lock_bh(&sdata->u.nan.func_lock);
963
964 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
965 idr_remove(&sdata->u.nan.function_inst_ids, i);
966 cfg80211_free_nan_func(func);
967 }
968 idr_destroy(&sdata->u.nan.function_inst_ids);
969
970 spin_unlock_bh(&sdata->u.nan.func_lock);
971 break;
972 case NL80211_IFTYPE_P2P_DEVICE:
973 /* relies on synchronize_rcu() below */
974 RCU_INIT_POINTER(local->p2p_sdata, NULL);
975 /* fall through */
976 default:
977 cancel_work_sync(&sdata->work);
978 /*
979 * When we get here, the interface is marked down.
980 * Free the remaining keys, if there are any
981 * (which can happen in AP mode if userspace sets
982 * keys before the interface is operating, and maybe
983 * also in WDS mode)
984 *
985 * Force the key freeing to always synchronize_net()
986 * to wait for the RX path in case it is using this
987 * interface enqueuing frames at this very time on
988 * another CPU.
989 */
990 ieee80211_free_keys(sdata, true);
991 skb_queue_purge(&sdata->skb_queue);
992 }
993
994 sdata->bss = NULL;
995
996 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
997 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
998 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
999 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1000 if (info->control.vif == &sdata->vif) {
1001 __skb_unlink(skb, &local->pending[i]);
1002 ieee80211_free_txskb(&local->hw, skb);
1003 }
1004 }
1005 }
1006 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1007
1008 if (txq_sdata->vif.txq) {
1009 struct txq_info *txqi = to_txq_info(txq_sdata->vif.txq);
1010
1011 /*
1012 * FIXME FIXME
1013 *
1014 * We really shouldn't purge the *entire* txqi since that
1015 * contains frames for the other AP_VLANs (and possibly
1016 * the AP itself) as well, but there's no API in FQ now
1017 * to be able to filter.
1018 */
1019
1020 spin_lock_bh(&fq->lock);
1021 ieee80211_txq_purge(local, txqi);
1022 spin_unlock_bh(&fq->lock);
1023 }
1024
1025 if (local->open_count == 0)
1026 ieee80211_clear_tx_pending(local);
1027
1028 /*
1029 * If the interface goes down while suspended, presumably because
1030 * the device was unplugged and that happens before our resume,
1031 * then the driver is already unconfigured and the remainder of
1032 * this function isn't needed.
1033 * XXX: what about WoWLAN? If the device has software state, e.g.
1034 * memory allocated, it might expect teardown commands from
1035 * mac80211 here?
1036 */
1037 if (local->suspended) {
1038 WARN_ON(local->wowlan);
1039 WARN_ON(rtnl_dereference(local->monitor_sdata));
1040 return;
1041 }
1042
1043 switch (sdata->vif.type) {
1044 case NL80211_IFTYPE_AP_VLAN:
1045 break;
1046 case NL80211_IFTYPE_MONITOR:
1047 if (local->monitors == 0)
1048 ieee80211_del_virtual_monitor(local);
1049
1050 mutex_lock(&local->mtx);
1051 ieee80211_recalc_idle(local);
1052 mutex_unlock(&local->mtx);
1053
1054 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1055 break;
1056
1057 /* fall through */
1058 default:
1059 if (going_down)
1060 drv_remove_interface(local, sdata);
1061 }
1062
1063 ieee80211_recalc_ps(local);
1064
1065 if (cancel_scan)
1066 flush_delayed_work(&local->scan_work);
1067
1068 if (local->open_count == 0) {
1069 ieee80211_stop_device(local);
1070
1071 /* no reconfiguring after stop! */
1072 return;
1073 }
1074
1075 /* do after stop to avoid reconfiguring when we stop anyway */
1076 ieee80211_configure_filter(local);
1077 ieee80211_hw_config(local, hw_reconf_flags);
1078
1079 if (local->monitors == local->open_count)
1080 ieee80211_add_virtual_monitor(local);
1081 }
1082
ieee80211_stop(struct net_device * dev)1083 static int ieee80211_stop(struct net_device *dev)
1084 {
1085 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1086
1087 ieee80211_do_stop(sdata, true);
1088
1089 return 0;
1090 }
1091
ieee80211_set_multicast_list(struct net_device * dev)1092 static void ieee80211_set_multicast_list(struct net_device *dev)
1093 {
1094 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1095 struct ieee80211_local *local = sdata->local;
1096 int allmulti, sdata_allmulti;
1097
1098 allmulti = !!(dev->flags & IFF_ALLMULTI);
1099 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1100
1101 if (allmulti != sdata_allmulti) {
1102 if (dev->flags & IFF_ALLMULTI)
1103 atomic_inc(&local->iff_allmultis);
1104 else
1105 atomic_dec(&local->iff_allmultis);
1106 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1107 }
1108
1109 spin_lock_bh(&local->filter_lock);
1110 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1111 spin_unlock_bh(&local->filter_lock);
1112 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1113 }
1114
1115 /*
1116 * Called when the netdev is removed or, by the code below, before
1117 * the interface type changes.
1118 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)1119 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1120 {
1121 int i;
1122
1123 /* free extra data */
1124 ieee80211_free_keys(sdata, false);
1125
1126 ieee80211_debugfs_remove_netdev(sdata);
1127
1128 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1129 __skb_queue_purge(&sdata->fragments[i].skb_list);
1130 sdata->fragment_next = 0;
1131
1132 if (ieee80211_vif_is_mesh(&sdata->vif))
1133 ieee80211_mesh_teardown_sdata(sdata);
1134 }
1135
ieee80211_uninit(struct net_device * dev)1136 static void ieee80211_uninit(struct net_device *dev)
1137 {
1138 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1139 }
1140
ieee80211_netdev_select_queue(struct net_device * dev,struct sk_buff * skb,void * accel_priv,select_queue_fallback_t fallback)1141 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1142 struct sk_buff *skb,
1143 void *accel_priv,
1144 select_queue_fallback_t fallback)
1145 {
1146 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1147 }
1148
1149 static struct rtnl_link_stats64 *
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)1150 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1151 {
1152 int i;
1153
1154 for_each_possible_cpu(i) {
1155 const struct pcpu_sw_netstats *tstats;
1156 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1157 unsigned int start;
1158
1159 tstats = per_cpu_ptr(dev->tstats, i);
1160
1161 do {
1162 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1163 rx_packets = tstats->rx_packets;
1164 tx_packets = tstats->tx_packets;
1165 rx_bytes = tstats->rx_bytes;
1166 tx_bytes = tstats->tx_bytes;
1167 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1168
1169 stats->rx_packets += rx_packets;
1170 stats->tx_packets += tx_packets;
1171 stats->rx_bytes += rx_bytes;
1172 stats->tx_bytes += tx_bytes;
1173 }
1174
1175 return stats;
1176 }
1177
1178 static const struct net_device_ops ieee80211_dataif_ops = {
1179 .ndo_open = ieee80211_open,
1180 .ndo_stop = ieee80211_stop,
1181 .ndo_uninit = ieee80211_uninit,
1182 .ndo_start_xmit = ieee80211_subif_start_xmit,
1183 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1184 .ndo_change_mtu = ieee80211_change_mtu,
1185 .ndo_set_mac_address = ieee80211_change_mac,
1186 .ndo_select_queue = ieee80211_netdev_select_queue,
1187 .ndo_get_stats64 = ieee80211_get_stats64,
1188 };
1189
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,void * accel_priv,select_queue_fallback_t fallback)1190 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1191 struct sk_buff *skb,
1192 void *accel_priv,
1193 select_queue_fallback_t fallback)
1194 {
1195 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1196 struct ieee80211_local *local = sdata->local;
1197 struct ieee80211_hdr *hdr;
1198 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1199
1200 if (local->hw.queues < IEEE80211_NUM_ACS)
1201 return 0;
1202
1203 if (skb->len < 4 ||
1204 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1205 return 0; /* doesn't matter, frame will be dropped */
1206
1207 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1208
1209 return ieee80211_select_queue_80211(sdata, skb, hdr);
1210 }
1211
1212 static const struct net_device_ops ieee80211_monitorif_ops = {
1213 .ndo_open = ieee80211_open,
1214 .ndo_stop = ieee80211_stop,
1215 .ndo_uninit = ieee80211_uninit,
1216 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1217 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1218 .ndo_change_mtu = ieee80211_change_mtu,
1219 .ndo_set_mac_address = ieee80211_change_mac,
1220 .ndo_select_queue = ieee80211_monitor_select_queue,
1221 .ndo_get_stats64 = ieee80211_get_stats64,
1222 };
1223
ieee80211_if_free(struct net_device * dev)1224 static void ieee80211_if_free(struct net_device *dev)
1225 {
1226 free_percpu(dev->tstats);
1227 free_netdev(dev);
1228 }
1229
ieee80211_if_setup(struct net_device * dev)1230 static void ieee80211_if_setup(struct net_device *dev)
1231 {
1232 ether_setup(dev);
1233 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1234 dev->netdev_ops = &ieee80211_dataif_ops;
1235 dev->destructor = ieee80211_if_free;
1236 }
1237
ieee80211_if_setup_no_queue(struct net_device * dev)1238 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1239 {
1240 ieee80211_if_setup(dev);
1241 dev->priv_flags |= IFF_NO_QUEUE;
1242 }
1243
ieee80211_iface_work(struct work_struct * work)1244 static void ieee80211_iface_work(struct work_struct *work)
1245 {
1246 struct ieee80211_sub_if_data *sdata =
1247 container_of(work, struct ieee80211_sub_if_data, work);
1248 struct ieee80211_local *local = sdata->local;
1249 struct sk_buff *skb;
1250 struct sta_info *sta;
1251 struct ieee80211_ra_tid *ra_tid;
1252 struct ieee80211_rx_agg *rx_agg;
1253
1254 if (!ieee80211_sdata_running(sdata))
1255 return;
1256
1257 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1258 return;
1259
1260 if (!ieee80211_can_run_worker(local))
1261 return;
1262
1263 /* first process frames */
1264 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1265 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1266
1267 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1268 ra_tid = (void *)&skb->cb;
1269 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1270 ra_tid->tid);
1271 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1272 ra_tid = (void *)&skb->cb;
1273 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1274 ra_tid->tid);
1275 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1276 rx_agg = (void *)&skb->cb;
1277 mutex_lock(&local->sta_mtx);
1278 sta = sta_info_get_bss(sdata, rx_agg->addr);
1279 if (sta)
1280 __ieee80211_start_rx_ba_session(sta,
1281 0, 0, 0, 1, rx_agg->tid,
1282 IEEE80211_MAX_AMPDU_BUF,
1283 false, true);
1284 mutex_unlock(&local->sta_mtx);
1285 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1286 rx_agg = (void *)&skb->cb;
1287 mutex_lock(&local->sta_mtx);
1288 sta = sta_info_get_bss(sdata, rx_agg->addr);
1289 if (sta)
1290 __ieee80211_stop_rx_ba_session(sta,
1291 rx_agg->tid,
1292 WLAN_BACK_RECIPIENT, 0,
1293 false);
1294 mutex_unlock(&local->sta_mtx);
1295 } else if (ieee80211_is_action(mgmt->frame_control) &&
1296 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1297 int len = skb->len;
1298
1299 mutex_lock(&local->sta_mtx);
1300 sta = sta_info_get_bss(sdata, mgmt->sa);
1301 if (sta) {
1302 switch (mgmt->u.action.u.addba_req.action_code) {
1303 case WLAN_ACTION_ADDBA_REQ:
1304 ieee80211_process_addba_request(
1305 local, sta, mgmt, len);
1306 break;
1307 case WLAN_ACTION_ADDBA_RESP:
1308 ieee80211_process_addba_resp(local, sta,
1309 mgmt, len);
1310 break;
1311 case WLAN_ACTION_DELBA:
1312 ieee80211_process_delba(sdata, sta,
1313 mgmt, len);
1314 break;
1315 default:
1316 WARN_ON(1);
1317 break;
1318 }
1319 }
1320 mutex_unlock(&local->sta_mtx);
1321 } else if (ieee80211_is_action(mgmt->frame_control) &&
1322 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1323 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1324 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1325 struct ieee80211_rx_status *status;
1326 enum nl80211_band band;
1327 u8 opmode;
1328
1329 status = IEEE80211_SKB_RXCB(skb);
1330 band = status->band;
1331 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1332
1333 mutex_lock(&local->sta_mtx);
1334 sta = sta_info_get_bss(sdata, mgmt->sa);
1335
1336 if (sta)
1337 ieee80211_vht_handle_opmode(sdata, sta,
1338 opmode,
1339 band);
1340
1341 mutex_unlock(&local->sta_mtx);
1342 break;
1343 }
1344 case WLAN_VHT_ACTION_GROUPID_MGMT:
1345 ieee80211_process_mu_groups(sdata, mgmt);
1346 break;
1347 default:
1348 WARN_ON(1);
1349 break;
1350 }
1351 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1352 struct ieee80211_hdr *hdr = (void *)mgmt;
1353 /*
1354 * So the frame isn't mgmt, but frame_control
1355 * is at the right place anyway, of course, so
1356 * the if statement is correct.
1357 *
1358 * Warn if we have other data frame types here,
1359 * they must not get here.
1360 */
1361 WARN_ON(hdr->frame_control &
1362 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1363 WARN_ON(!(hdr->seq_ctrl &
1364 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1365 /*
1366 * This was a fragment of a frame, received while
1367 * a block-ack session was active. That cannot be
1368 * right, so terminate the session.
1369 */
1370 mutex_lock(&local->sta_mtx);
1371 sta = sta_info_get_bss(sdata, mgmt->sa);
1372 if (sta) {
1373 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1374 IEEE80211_QOS_CTL_TID_MASK;
1375
1376 __ieee80211_stop_rx_ba_session(
1377 sta, tid, WLAN_BACK_RECIPIENT,
1378 WLAN_REASON_QSTA_REQUIRE_SETUP,
1379 true);
1380 }
1381 mutex_unlock(&local->sta_mtx);
1382 } else switch (sdata->vif.type) {
1383 case NL80211_IFTYPE_STATION:
1384 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1385 break;
1386 case NL80211_IFTYPE_ADHOC:
1387 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1388 break;
1389 case NL80211_IFTYPE_MESH_POINT:
1390 if (!ieee80211_vif_is_mesh(&sdata->vif))
1391 break;
1392 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1393 break;
1394 default:
1395 WARN(1, "frame for unexpected interface type");
1396 break;
1397 }
1398
1399 kfree_skb(skb);
1400 }
1401
1402 /* then other type-dependent work */
1403 switch (sdata->vif.type) {
1404 case NL80211_IFTYPE_STATION:
1405 ieee80211_sta_work(sdata);
1406 break;
1407 case NL80211_IFTYPE_ADHOC:
1408 ieee80211_ibss_work(sdata);
1409 break;
1410 case NL80211_IFTYPE_MESH_POINT:
1411 if (!ieee80211_vif_is_mesh(&sdata->vif))
1412 break;
1413 ieee80211_mesh_work(sdata);
1414 break;
1415 case NL80211_IFTYPE_OCB:
1416 ieee80211_ocb_work(sdata);
1417 break;
1418 default:
1419 break;
1420 }
1421 }
1422
ieee80211_recalc_smps_work(struct work_struct * work)1423 static void ieee80211_recalc_smps_work(struct work_struct *work)
1424 {
1425 struct ieee80211_sub_if_data *sdata =
1426 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1427
1428 ieee80211_recalc_smps(sdata);
1429 }
1430
1431 /*
1432 * Helper function to initialise an interface to a specific type.
1433 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1434 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1435 enum nl80211_iftype type)
1436 {
1437 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1438 0xff, 0xff, 0xff};
1439
1440 /* clear type-dependent union */
1441 memset(&sdata->u, 0, sizeof(sdata->u));
1442
1443 /* and set some type-dependent values */
1444 sdata->vif.type = type;
1445 sdata->vif.p2p = false;
1446 sdata->wdev.iftype = type;
1447
1448 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1449 sdata->control_port_no_encrypt = false;
1450 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1451 sdata->vif.bss_conf.idle = true;
1452
1453 sdata->noack_map = 0;
1454
1455 /* only monitor/p2p-device differ */
1456 if (sdata->dev) {
1457 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1458 sdata->dev->type = ARPHRD_ETHER;
1459 }
1460
1461 skb_queue_head_init(&sdata->skb_queue);
1462 INIT_WORK(&sdata->work, ieee80211_iface_work);
1463 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1464 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1465 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1466 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1467
1468 switch (type) {
1469 case NL80211_IFTYPE_P2P_GO:
1470 type = NL80211_IFTYPE_AP;
1471 sdata->vif.type = type;
1472 sdata->vif.p2p = true;
1473 /* fall through */
1474 case NL80211_IFTYPE_AP:
1475 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1476 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1477 INIT_WORK(&sdata->u.ap.request_smps_work,
1478 ieee80211_request_smps_ap_work);
1479 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1480 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1481 break;
1482 case NL80211_IFTYPE_P2P_CLIENT:
1483 type = NL80211_IFTYPE_STATION;
1484 sdata->vif.type = type;
1485 sdata->vif.p2p = true;
1486 /* fall through */
1487 case NL80211_IFTYPE_STATION:
1488 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1489 ieee80211_sta_setup_sdata(sdata);
1490 break;
1491 case NL80211_IFTYPE_OCB:
1492 sdata->vif.bss_conf.bssid = bssid_wildcard;
1493 ieee80211_ocb_setup_sdata(sdata);
1494 break;
1495 case NL80211_IFTYPE_ADHOC:
1496 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1497 ieee80211_ibss_setup_sdata(sdata);
1498 break;
1499 case NL80211_IFTYPE_MESH_POINT:
1500 if (ieee80211_vif_is_mesh(&sdata->vif))
1501 ieee80211_mesh_init_sdata(sdata);
1502 break;
1503 case NL80211_IFTYPE_MONITOR:
1504 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1505 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1506 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1507 MONITOR_FLAG_OTHER_BSS;
1508 break;
1509 case NL80211_IFTYPE_WDS:
1510 sdata->vif.bss_conf.bssid = NULL;
1511 break;
1512 case NL80211_IFTYPE_NAN:
1513 idr_init(&sdata->u.nan.function_inst_ids);
1514 spin_lock_init(&sdata->u.nan.func_lock);
1515 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1516 break;
1517 case NL80211_IFTYPE_AP_VLAN:
1518 case NL80211_IFTYPE_P2P_DEVICE:
1519 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1520 break;
1521 case NL80211_IFTYPE_UNSPECIFIED:
1522 case NUM_NL80211_IFTYPES:
1523 WARN_ON(1);
1524 break;
1525 }
1526
1527 ieee80211_debugfs_add_netdev(sdata);
1528 }
1529
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1530 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1531 enum nl80211_iftype type)
1532 {
1533 struct ieee80211_local *local = sdata->local;
1534 int ret, err;
1535 enum nl80211_iftype internal_type = type;
1536 bool p2p = false;
1537
1538 ASSERT_RTNL();
1539
1540 if (!local->ops->change_interface)
1541 return -EBUSY;
1542
1543 switch (sdata->vif.type) {
1544 case NL80211_IFTYPE_AP:
1545 case NL80211_IFTYPE_STATION:
1546 case NL80211_IFTYPE_ADHOC:
1547 case NL80211_IFTYPE_OCB:
1548 /*
1549 * Could maybe also all others here?
1550 * Just not sure how that interacts
1551 * with the RX/config path e.g. for
1552 * mesh.
1553 */
1554 break;
1555 default:
1556 return -EBUSY;
1557 }
1558
1559 switch (type) {
1560 case NL80211_IFTYPE_AP:
1561 case NL80211_IFTYPE_STATION:
1562 case NL80211_IFTYPE_ADHOC:
1563 case NL80211_IFTYPE_OCB:
1564 /*
1565 * Could probably support everything
1566 * but WDS here (WDS do_open can fail
1567 * under memory pressure, which this
1568 * code isn't prepared to handle).
1569 */
1570 break;
1571 case NL80211_IFTYPE_P2P_CLIENT:
1572 p2p = true;
1573 internal_type = NL80211_IFTYPE_STATION;
1574 break;
1575 case NL80211_IFTYPE_P2P_GO:
1576 p2p = true;
1577 internal_type = NL80211_IFTYPE_AP;
1578 break;
1579 default:
1580 return -EBUSY;
1581 }
1582
1583 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1584 if (ret)
1585 return ret;
1586
1587 ieee80211_do_stop(sdata, false);
1588
1589 ieee80211_teardown_sdata(sdata);
1590
1591 ret = drv_change_interface(local, sdata, internal_type, p2p);
1592 if (ret)
1593 type = ieee80211_vif_type_p2p(&sdata->vif);
1594
1595 /*
1596 * Ignore return value here, there's not much we can do since
1597 * the driver changed the interface type internally already.
1598 * The warnings will hopefully make driver authors fix it :-)
1599 */
1600 ieee80211_check_queues(sdata, type);
1601
1602 ieee80211_setup_sdata(sdata, type);
1603
1604 err = ieee80211_do_open(&sdata->wdev, false);
1605 WARN(err, "type change: do_open returned %d", err);
1606
1607 return ret;
1608 }
1609
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1610 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1611 enum nl80211_iftype type)
1612 {
1613 int ret;
1614
1615 ASSERT_RTNL();
1616
1617 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1618 return 0;
1619
1620 if (ieee80211_sdata_running(sdata)) {
1621 ret = ieee80211_runtime_change_iftype(sdata, type);
1622 if (ret)
1623 return ret;
1624 } else {
1625 /* Purge and reset type-dependent state. */
1626 ieee80211_teardown_sdata(sdata);
1627 ieee80211_setup_sdata(sdata, type);
1628 }
1629
1630 /* reset some values that shouldn't be kept across type changes */
1631 if (type == NL80211_IFTYPE_STATION)
1632 sdata->u.mgd.use_4addr = false;
1633
1634 return 0;
1635 }
1636
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1637 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1638 u8 *perm_addr, enum nl80211_iftype type)
1639 {
1640 struct ieee80211_sub_if_data *sdata;
1641 u64 mask, start, addr, val, inc;
1642 u8 *m;
1643 u8 tmp_addr[ETH_ALEN];
1644 int i;
1645
1646 /* default ... something at least */
1647 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1648
1649 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1650 local->hw.wiphy->n_addresses <= 1)
1651 return;
1652
1653 mutex_lock(&local->iflist_mtx);
1654
1655 switch (type) {
1656 case NL80211_IFTYPE_MONITOR:
1657 /* doesn't matter */
1658 break;
1659 case NL80211_IFTYPE_WDS:
1660 case NL80211_IFTYPE_AP_VLAN:
1661 /* match up with an AP interface */
1662 list_for_each_entry(sdata, &local->interfaces, list) {
1663 if (sdata->vif.type != NL80211_IFTYPE_AP)
1664 continue;
1665 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1666 break;
1667 }
1668 /* keep default if no AP interface present */
1669 break;
1670 case NL80211_IFTYPE_P2P_CLIENT:
1671 case NL80211_IFTYPE_P2P_GO:
1672 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1673 list_for_each_entry(sdata, &local->interfaces, list) {
1674 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1675 continue;
1676 if (!ieee80211_sdata_running(sdata))
1677 continue;
1678 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1679 goto out_unlock;
1680 }
1681 }
1682 /* otherwise fall through */
1683 default:
1684 /* assign a new address if possible -- try n_addresses first */
1685 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1686 bool used = false;
1687
1688 list_for_each_entry(sdata, &local->interfaces, list) {
1689 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1690 sdata->vif.addr)) {
1691 used = true;
1692 break;
1693 }
1694 }
1695
1696 if (!used) {
1697 memcpy(perm_addr,
1698 local->hw.wiphy->addresses[i].addr,
1699 ETH_ALEN);
1700 break;
1701 }
1702 }
1703
1704 /* try mask if available */
1705 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1706 break;
1707
1708 m = local->hw.wiphy->addr_mask;
1709 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1710 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1711 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1712
1713 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1714 /* not a contiguous mask ... not handled now! */
1715 pr_info("not contiguous\n");
1716 break;
1717 }
1718
1719 /*
1720 * Pick address of existing interface in case user changed
1721 * MAC address manually, default to perm_addr.
1722 */
1723 m = local->hw.wiphy->perm_addr;
1724 list_for_each_entry(sdata, &local->interfaces, list) {
1725 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1726 continue;
1727 m = sdata->vif.addr;
1728 break;
1729 }
1730 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1731 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1732 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1733
1734 inc = 1ULL<<__ffs64(mask);
1735 val = (start & mask);
1736 addr = (start & ~mask) | (val & mask);
1737 do {
1738 bool used = false;
1739
1740 tmp_addr[5] = addr >> 0*8;
1741 tmp_addr[4] = addr >> 1*8;
1742 tmp_addr[3] = addr >> 2*8;
1743 tmp_addr[2] = addr >> 3*8;
1744 tmp_addr[1] = addr >> 4*8;
1745 tmp_addr[0] = addr >> 5*8;
1746
1747 val += inc;
1748
1749 list_for_each_entry(sdata, &local->interfaces, list) {
1750 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1751 used = true;
1752 break;
1753 }
1754 }
1755
1756 if (!used) {
1757 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1758 break;
1759 }
1760 addr = (start & ~mask) | (val & mask);
1761 } while (addr != start);
1762
1763 break;
1764 }
1765
1766 out_unlock:
1767 mutex_unlock(&local->iflist_mtx);
1768 }
1769
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)1770 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1771 unsigned char name_assign_type,
1772 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1773 struct vif_params *params)
1774 {
1775 struct net_device *ndev = NULL;
1776 struct ieee80211_sub_if_data *sdata = NULL;
1777 struct txq_info *txqi;
1778 void (*if_setup)(struct net_device *dev);
1779 int ret, i;
1780 int txqs = 1;
1781
1782 ASSERT_RTNL();
1783
1784 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1785 struct wireless_dev *wdev;
1786
1787 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1788 GFP_KERNEL);
1789 if (!sdata)
1790 return -ENOMEM;
1791 wdev = &sdata->wdev;
1792
1793 sdata->dev = NULL;
1794 strlcpy(sdata->name, name, IFNAMSIZ);
1795 ieee80211_assign_perm_addr(local, wdev->address, type);
1796 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1797 } else {
1798 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1799 sizeof(void *));
1800 int txq_size = 0;
1801
1802 if (local->ops->wake_tx_queue)
1803 txq_size += sizeof(struct txq_info) +
1804 local->hw.txq_data_size;
1805
1806 if (local->ops->wake_tx_queue)
1807 if_setup = ieee80211_if_setup_no_queue;
1808 else
1809 if_setup = ieee80211_if_setup;
1810
1811 if (local->hw.queues >= IEEE80211_NUM_ACS)
1812 txqs = IEEE80211_NUM_ACS;
1813
1814 ndev = alloc_netdev_mqs(size + txq_size,
1815 name, name_assign_type,
1816 if_setup, txqs, 1);
1817 if (!ndev)
1818 return -ENOMEM;
1819 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1820
1821 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1822 if (!ndev->tstats) {
1823 free_netdev(ndev);
1824 return -ENOMEM;
1825 }
1826
1827 ndev->needed_headroom = local->tx_headroom +
1828 4*6 /* four MAC addresses */
1829 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1830 + 6 /* mesh */
1831 + 8 /* rfc1042/bridge tunnel */
1832 - ETH_HLEN /* ethernet hard_header_len */
1833 + IEEE80211_ENCRYPT_HEADROOM;
1834 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1835
1836 ret = dev_alloc_name(ndev, ndev->name);
1837 if (ret < 0) {
1838 ieee80211_if_free(ndev);
1839 return ret;
1840 }
1841
1842 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1843 if (params && is_valid_ether_addr(params->macaddr))
1844 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1845 else
1846 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1847 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1848
1849 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1850 sdata = netdev_priv(ndev);
1851 ndev->ieee80211_ptr = &sdata->wdev;
1852 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1853 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1854
1855 if (txq_size) {
1856 txqi = netdev_priv(ndev) + size;
1857 ieee80211_txq_init(sdata, NULL, txqi, 0);
1858 }
1859
1860 sdata->dev = ndev;
1861 }
1862
1863 /* initialise type-independent data */
1864 sdata->wdev.wiphy = local->hw.wiphy;
1865 sdata->local = local;
1866
1867 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1868 skb_queue_head_init(&sdata->fragments[i].skb_list);
1869
1870 INIT_LIST_HEAD(&sdata->key_list);
1871
1872 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1873 ieee80211_dfs_cac_timer_work);
1874 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1875 ieee80211_delayed_tailroom_dec);
1876
1877 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1878 struct ieee80211_supported_band *sband;
1879 sband = local->hw.wiphy->bands[i];
1880 sdata->rc_rateidx_mask[i] =
1881 sband ? (1 << sband->n_bitrates) - 1 : 0;
1882 if (sband) {
1883 __le16 cap;
1884 u16 *vht_rate_mask;
1885
1886 memcpy(sdata->rc_rateidx_mcs_mask[i],
1887 sband->ht_cap.mcs.rx_mask,
1888 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1889
1890 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1891 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1892 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1893 } else {
1894 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1895 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1896 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1897 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1898 }
1899 }
1900
1901 ieee80211_set_default_queues(sdata);
1902
1903 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1904 sdata->user_power_level = local->user_power_level;
1905
1906 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1907
1908 /* setup type-dependent data */
1909 ieee80211_setup_sdata(sdata, type);
1910
1911 if (ndev) {
1912 if (params) {
1913 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1914 if (type == NL80211_IFTYPE_STATION)
1915 sdata->u.mgd.use_4addr = params->use_4addr;
1916 }
1917
1918 ndev->features |= local->hw.netdev_features;
1919
1920 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1921
1922 ret = register_netdevice(ndev);
1923 if (ret) {
1924 ieee80211_if_free(ndev);
1925 return ret;
1926 }
1927 }
1928
1929 mutex_lock(&local->iflist_mtx);
1930 list_add_tail_rcu(&sdata->list, &local->interfaces);
1931 mutex_unlock(&local->iflist_mtx);
1932
1933 if (new_wdev)
1934 *new_wdev = &sdata->wdev;
1935
1936 return 0;
1937 }
1938
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)1939 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1940 {
1941 ASSERT_RTNL();
1942
1943 mutex_lock(&sdata->local->iflist_mtx);
1944 list_del_rcu(&sdata->list);
1945 mutex_unlock(&sdata->local->iflist_mtx);
1946
1947 synchronize_rcu();
1948
1949 if (sdata->dev) {
1950 unregister_netdevice(sdata->dev);
1951 } else {
1952 cfg80211_unregister_wdev(&sdata->wdev);
1953 ieee80211_teardown_sdata(sdata);
1954 kfree(sdata);
1955 }
1956 }
1957
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)1958 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1959 {
1960 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1961 return;
1962 ieee80211_do_stop(sdata, true);
1963 }
1964
ieee80211_remove_interfaces(struct ieee80211_local * local)1965 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1966 {
1967 struct ieee80211_sub_if_data *sdata, *tmp;
1968 LIST_HEAD(unreg_list);
1969 LIST_HEAD(wdev_list);
1970
1971 ASSERT_RTNL();
1972
1973 /* Before destroying the interfaces, make sure they're all stopped so
1974 * that the hardware is stopped. Otherwise, the driver might still be
1975 * iterating the interfaces during the shutdown, e.g. from a worker
1976 * or from RX processing or similar, and if it does so (using atomic
1977 * iteration) while we're manipulating the list, the iteration will
1978 * crash.
1979 *
1980 * After this, the hardware should be stopped and the driver should
1981 * have stopped all of its activities, so that we can do RCU-unaware
1982 * manipulations of the interface list below.
1983 */
1984 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1985
1986 WARN(local->open_count, "%s: open count remains %d\n",
1987 wiphy_name(local->hw.wiphy), local->open_count);
1988
1989 mutex_lock(&local->iflist_mtx);
1990 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1991 list_del(&sdata->list);
1992
1993 if (sdata->dev)
1994 unregister_netdevice_queue(sdata->dev, &unreg_list);
1995 else
1996 list_add(&sdata->list, &wdev_list);
1997 }
1998 mutex_unlock(&local->iflist_mtx);
1999 unregister_netdevice_many(&unreg_list);
2000
2001 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2002 list_del(&sdata->list);
2003 cfg80211_unregister_wdev(&sdata->wdev);
2004 kfree(sdata);
2005 }
2006 }
2007
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2008 static int netdev_notify(struct notifier_block *nb,
2009 unsigned long state, void *ptr)
2010 {
2011 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2012 struct ieee80211_sub_if_data *sdata;
2013
2014 if (state != NETDEV_CHANGENAME)
2015 return NOTIFY_DONE;
2016
2017 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2018 return NOTIFY_DONE;
2019
2020 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2021 return NOTIFY_DONE;
2022
2023 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2024 memcpy(sdata->name, dev->name, IFNAMSIZ);
2025 ieee80211_debugfs_rename_netdev(sdata);
2026
2027 return NOTIFY_OK;
2028 }
2029
2030 static struct notifier_block mac80211_netdev_notifier = {
2031 .notifier_call = netdev_notify,
2032 };
2033
ieee80211_iface_init(void)2034 int ieee80211_iface_init(void)
2035 {
2036 return register_netdevice_notifier(&mac80211_netdev_notifier);
2037 }
2038
ieee80211_iface_exit(void)2039 void ieee80211_iface_exit(void)
2040 {
2041 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2042 }
2043