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perf/x86: Add support for sampling PEBS machine state registers
[linux/fpc-iii.git] / net / mac80211 / iface.c
blobaf237223a8cd9bd3aa6121576650238d42e3bbb0
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
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
76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
77 {
78 if (__ieee80211_recalc_txpower(sdata))
79 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
80 }
81
82 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
83 {
84 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
85 return 0;
86
87 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
88 return IEEE80211_CONF_CHANGE_IDLE;
89 }
90
91 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
92 {
93 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
94 return 0;
95
96 ieee80211_flush_queues(local, NULL);
97
98 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
99 return IEEE80211_CONF_CHANGE_IDLE;
100 }
101
102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
103 bool force_active)
104 {
105 bool working, scanning, active;
106 unsigned int led_trig_start = 0, led_trig_stop = 0;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = force_active ||
111 !list_empty(&local->chanctx_list) ||
112 local->monitors;
113
114 working = !local->ops->remain_on_channel &&
115 !list_empty(&local->roc_list);
116
117 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
118 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
119
120 if (working || scanning)
121 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
122 else
123 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
124
125 if (active)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
129
130 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
131
132 if (working || scanning || active)
133 return __ieee80211_idle_off(local);
134 return __ieee80211_idle_on(local);
135 }
136
137 u32 ieee80211_idle_off(struct ieee80211_local *local)
138 {
139 return __ieee80211_recalc_idle(local, true);
140 }
141
142 void ieee80211_recalc_idle(struct ieee80211_local *local)
143 {
144 u32 change = __ieee80211_recalc_idle(local, false);
145 if (change)
146 ieee80211_hw_config(local, change);
147 }
148
149 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
150 {
151 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
152 return -EINVAL;
153
154 dev->mtu = new_mtu;
155 return 0;
156 }
157
158 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
159 bool check_dup)
160 {
161 struct ieee80211_local *local = sdata->local;
162 struct ieee80211_sub_if_data *iter;
163 u64 new, mask, tmp;
164 u8 *m;
165 int ret = 0;
166
167 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
168 return 0;
169
170 m = addr;
171 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174
175 m = local->hw.wiphy->addr_mask;
176 mask = ((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 if (!check_dup)
181 return ret;
182
183 mutex_lock(&local->iflist_mtx);
184 list_for_each_entry(iter, &local->interfaces, list) {
185 if (iter == sdata)
186 continue;
187
188 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
189 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
190 continue;
191
192 m = iter->vif.addr;
193 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
194 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
195 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
196
197 if ((new & ~mask) != (tmp & ~mask)) {
198 ret = -EINVAL;
199 break;
200 }
201 }
202 mutex_unlock(&local->iflist_mtx);
203
204 return ret;
205 }
206
207 static int ieee80211_change_mac(struct net_device *dev, void *addr)
208 {
209 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
210 struct sockaddr *sa = addr;
211 bool check_dup = true;
212 int ret;
213
214 if (ieee80211_sdata_running(sdata))
215 return -EBUSY;
216
217 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
218 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
219 check_dup = false;
220
221 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
222 if (ret)
223 return ret;
224
225 ret = eth_mac_addr(dev, sa);
226
227 if (ret == 0)
228 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
229
230 return ret;
231 }
232
233 static inline int identical_mac_addr_allowed(int type1, int type2)
234 {
235 return type1 == NL80211_IFTYPE_MONITOR ||
236 type2 == NL80211_IFTYPE_MONITOR ||
237 type1 == NL80211_IFTYPE_P2P_DEVICE ||
238 type2 == NL80211_IFTYPE_P2P_DEVICE ||
239 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
240 (type1 == NL80211_IFTYPE_WDS &&
241 (type2 == NL80211_IFTYPE_WDS ||
242 type2 == NL80211_IFTYPE_AP)) ||
243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
244 (type1 == NL80211_IFTYPE_AP_VLAN &&
245 (type2 == NL80211_IFTYPE_AP ||
246 type2 == NL80211_IFTYPE_AP_VLAN));
247 }
248
249 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
250 enum nl80211_iftype iftype)
251 {
252 struct ieee80211_local *local = sdata->local;
253 struct ieee80211_sub_if_data *nsdata;
254 int ret;
255
256 ASSERT_RTNL();
257
258 /* we hold the RTNL here so can safely walk the list */
259 list_for_each_entry(nsdata, &local->interfaces, list) {
260 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
261 /*
262 * Allow only a single IBSS interface to be up at any
263 * time. This is restricted because beacon distribution
264 * cannot work properly if both are in the same IBSS.
265 *
266 * To remove this restriction we'd have to disallow them
267 * from setting the same SSID on different IBSS interfaces
268 * belonging to the same hardware. Then, however, we're
269 * faced with having to adopt two different TSF timers...
270 */
271 if (iftype == NL80211_IFTYPE_ADHOC &&
272 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
273 return -EBUSY;
274 /*
275 * will not add another interface while any channel
276 * switch is active.
277 */
278 if (nsdata->vif.csa_active)
279 return -EBUSY;
280
281 /*
282 * The remaining checks are only performed for interfaces
283 * with the same MAC address.
284 */
285 if (!ether_addr_equal(sdata->vif.addr,
286 nsdata->vif.addr))
287 continue;
288
289 /*
290 * check whether it may have the same address
291 */
292 if (!identical_mac_addr_allowed(iftype,
293 nsdata->vif.type))
294 return -ENOTUNIQ;
295
296 /*
297 * can only add VLANs to enabled APs
298 */
299 if (iftype == NL80211_IFTYPE_AP_VLAN &&
300 nsdata->vif.type == NL80211_IFTYPE_AP)
301 sdata->bss = &nsdata->u.ap;
302 }
303 }
304
305 mutex_lock(&local->chanctx_mtx);
306 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
307 mutex_unlock(&local->chanctx_mtx);
308 return ret;
309 }
310
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 enum nl80211_iftype iftype)
313 {
314 int n_queues = sdata->local->hw.queues;
315 int i;
316
317 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
318 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320 IEEE80211_INVAL_HW_QUEUE))
321 return -EINVAL;
322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323 n_queues))
324 return -EINVAL;
325 }
326 }
327
328 if ((iftype != NL80211_IFTYPE_AP &&
329 iftype != NL80211_IFTYPE_P2P_GO &&
330 iftype != NL80211_IFTYPE_MESH_POINT) ||
331 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333 return 0;
334 }
335
336 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337 return -EINVAL;
338
339 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340 return -EINVAL;
341
342 return 0;
343 }
344
345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346 const int offset)
347 {
348 struct ieee80211_local *local = sdata->local;
349 u32 flags = sdata->u.mntr_flags;
350
351 #define ADJUST(_f, _s) do { \
352 if (flags & MONITOR_FLAG_##_f) \
353 local->fif_##_s += offset; \
354 } while (0)
355
356 ADJUST(FCSFAIL, fcsfail);
357 ADJUST(PLCPFAIL, plcpfail);
358 ADJUST(CONTROL, control);
359 ADJUST(CONTROL, pspoll);
360 ADJUST(OTHER_BSS, other_bss);
361
362 #undef ADJUST
363 }
364
365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367 struct ieee80211_local *local = sdata->local;
368 int i;
369
370 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373 else if (local->hw.queues >= IEEE80211_NUM_ACS)
374 sdata->vif.hw_queue[i] = i;
375 else
376 sdata->vif.hw_queue[i] = 0;
377 }
378 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380
381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383 struct ieee80211_sub_if_data *sdata;
384 int ret;
385
386 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387 return 0;
388
389 ASSERT_RTNL();
390
391 if (local->monitor_sdata)
392 return 0;
393
394 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395 if (!sdata)
396 return -ENOMEM;
397
398 /* set up data */
399 sdata->local = local;
400 sdata->vif.type = NL80211_IFTYPE_MONITOR;
401 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402 wiphy_name(local->hw.wiphy));
403 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
404
405 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
406
407 ieee80211_set_default_queues(sdata);
408
409 ret = drv_add_interface(local, sdata);
410 if (WARN_ON(ret)) {
411 /* ok .. stupid driver, it asked for this! */
412 kfree(sdata);
413 return ret;
414 }
415
416 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
417 if (ret) {
418 kfree(sdata);
419 return ret;
420 }
421
422 mutex_lock(&local->iflist_mtx);
423 rcu_assign_pointer(local->monitor_sdata, sdata);
424 mutex_unlock(&local->iflist_mtx);
425
426 mutex_lock(&local->mtx);
427 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
428 IEEE80211_CHANCTX_EXCLUSIVE);
429 mutex_unlock(&local->mtx);
430 if (ret) {
431 mutex_lock(&local->iflist_mtx);
432 RCU_INIT_POINTER(local->monitor_sdata, NULL);
433 mutex_unlock(&local->iflist_mtx);
434 synchronize_net();
435 drv_remove_interface(local, sdata);
436 kfree(sdata);
437 return ret;
438 }
439
440 return 0;
441 }
442
443 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
444 {
445 struct ieee80211_sub_if_data *sdata;
446
447 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
448 return;
449
450 ASSERT_RTNL();
451
452 mutex_lock(&local->iflist_mtx);
453
454 sdata = rcu_dereference_protected(local->monitor_sdata,
455 lockdep_is_held(&local->iflist_mtx));
456 if (!sdata) {
457 mutex_unlock(&local->iflist_mtx);
458 return;
459 }
460
461 RCU_INIT_POINTER(local->monitor_sdata, NULL);
462 mutex_unlock(&local->iflist_mtx);
463
464 synchronize_net();
465
466 mutex_lock(&local->mtx);
467 ieee80211_vif_release_channel(sdata);
468 mutex_unlock(&local->mtx);
469
470 drv_remove_interface(local, sdata);
471
472 kfree(sdata);
473 }
474
475 /*
476 * NOTE: Be very careful when changing this function, it must NOT return
477 * an error on interface type changes that have been pre-checked, so most
478 * checks should be in ieee80211_check_concurrent_iface.
479 */
480 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
481 {
482 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
483 struct net_device *dev = wdev->netdev;
484 struct ieee80211_local *local = sdata->local;
485 struct sta_info *sta;
486 u32 changed = 0;
487 int res;
488 u32 hw_reconf_flags = 0;
489
490 switch (sdata->vif.type) {
491 case NL80211_IFTYPE_WDS:
492 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
493 return -ENOLINK;
494 break;
495 case NL80211_IFTYPE_AP_VLAN: {
496 struct ieee80211_sub_if_data *master;
497
498 if (!sdata->bss)
499 return -ENOLINK;
500
501 mutex_lock(&local->mtx);
502 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
503 mutex_unlock(&local->mtx);
504
505 master = container_of(sdata->bss,
506 struct ieee80211_sub_if_data, u.ap);
507 sdata->control_port_protocol =
508 master->control_port_protocol;
509 sdata->control_port_no_encrypt =
510 master->control_port_no_encrypt;
511 sdata->vif.cab_queue = master->vif.cab_queue;
512 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
513 sizeof(sdata->vif.hw_queue));
514 break;
515 }
516 case NL80211_IFTYPE_AP:
517 sdata->bss = &sdata->u.ap;
518 break;
519 case NL80211_IFTYPE_MESH_POINT:
520 case NL80211_IFTYPE_STATION:
521 case NL80211_IFTYPE_MONITOR:
522 case NL80211_IFTYPE_ADHOC:
523 case NL80211_IFTYPE_P2P_DEVICE:
524 /* no special treatment */
525 break;
526 case NL80211_IFTYPE_UNSPECIFIED:
527 case NUM_NL80211_IFTYPES:
528 case NL80211_IFTYPE_P2P_CLIENT:
529 case NL80211_IFTYPE_P2P_GO:
530 /* cannot happen */
531 WARN_ON(1);
532 break;
533 }
534
535 if (local->open_count == 0) {
536 res = drv_start(local);
537 if (res)
538 goto err_del_bss;
539 /* we're brought up, everything changes */
540 hw_reconf_flags = ~0;
541 ieee80211_led_radio(local, true);
542 ieee80211_mod_tpt_led_trig(local,
543 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
544 }
545
546 /*
547 * Copy the hopefully now-present MAC address to
548 * this interface, if it has the special null one.
549 */
550 if (dev && is_zero_ether_addr(dev->dev_addr)) {
551 memcpy(dev->dev_addr,
552 local->hw.wiphy->perm_addr,
553 ETH_ALEN);
554 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
555
556 if (!is_valid_ether_addr(dev->dev_addr)) {
557 res = -EADDRNOTAVAIL;
558 goto err_stop;
559 }
560 }
561
562 switch (sdata->vif.type) {
563 case NL80211_IFTYPE_AP_VLAN:
564 /* no need to tell driver, but set carrier and chanctx */
565 if (rtnl_dereference(sdata->bss->beacon)) {
566 ieee80211_vif_vlan_copy_chanctx(sdata);
567 netif_carrier_on(dev);
568 } else {
569 netif_carrier_off(dev);
570 }
571 break;
572 case NL80211_IFTYPE_MONITOR:
573 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
574 local->cooked_mntrs++;
575 break;
576 }
577
578 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
579 res = drv_add_interface(local, sdata);
580 if (res)
581 goto err_stop;
582 } else if (local->monitors == 0 && local->open_count == 0) {
583 res = ieee80211_add_virtual_monitor(local);
584 if (res)
585 goto err_stop;
586 }
587
588 /* must be before the call to ieee80211_configure_filter */
589 local->monitors++;
590 if (local->monitors == 1) {
591 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
592 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
593 }
594
595 ieee80211_adjust_monitor_flags(sdata, 1);
596 ieee80211_configure_filter(local);
597 mutex_lock(&local->mtx);
598 ieee80211_recalc_idle(local);
599 mutex_unlock(&local->mtx);
600
601 netif_carrier_on(dev);
602 break;
603 default:
604 if (coming_up) {
605 ieee80211_del_virtual_monitor(local);
606
607 res = drv_add_interface(local, sdata);
608 if (res)
609 goto err_stop;
610 res = ieee80211_check_queues(sdata,
611 ieee80211_vif_type_p2p(&sdata->vif));
612 if (res)
613 goto err_del_interface;
614 }
615
616 if (sdata->vif.type == NL80211_IFTYPE_AP) {
617 local->fif_pspoll++;
618 local->fif_probe_req++;
619
620 ieee80211_configure_filter(local);
621 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
622 local->fif_probe_req++;
623 }
624
625 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
626 changed |= ieee80211_reset_erp_info(sdata);
627 ieee80211_bss_info_change_notify(sdata, changed);
628
629 switch (sdata->vif.type) {
630 case NL80211_IFTYPE_STATION:
631 case NL80211_IFTYPE_ADHOC:
632 case NL80211_IFTYPE_AP:
633 case NL80211_IFTYPE_MESH_POINT:
634 netif_carrier_off(dev);
635 break;
636 case NL80211_IFTYPE_WDS:
637 case NL80211_IFTYPE_P2P_DEVICE:
638 break;
639 default:
640 /* not reached */
641 WARN_ON(1);
642 }
643
644 /*
645 * set default queue parameters so drivers don't
646 * need to initialise the hardware if the hardware
647 * doesn't start up with sane defaults
648 */
649 ieee80211_set_wmm_default(sdata, true);
650 }
651
652 set_bit(SDATA_STATE_RUNNING, &sdata->state);
653
654 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
655 /* Create STA entry for the WDS peer */
656 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
657 GFP_KERNEL);
658 if (!sta) {
659 res = -ENOMEM;
660 goto err_del_interface;
661 }
662
663 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
664 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
665 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
666
667 res = sta_info_insert(sta);
668 if (res) {
669 /* STA has been freed */
670 goto err_del_interface;
671 }
672
673 rate_control_rate_init(sta);
674 netif_carrier_on(dev);
675 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
676 rcu_assign_pointer(local->p2p_sdata, sdata);
677 }
678
679 /*
680 * set_multicast_list will be invoked by the networking core
681 * which will check whether any increments here were done in
682 * error and sync them down to the hardware as filter flags.
683 */
684 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
685 atomic_inc(&local->iff_allmultis);
686
687 if (sdata->flags & IEEE80211_SDATA_PROMISC)
688 atomic_inc(&local->iff_promiscs);
689
690 if (coming_up)
691 local->open_count++;
692
693 if (hw_reconf_flags)
694 ieee80211_hw_config(local, hw_reconf_flags);
695
696 ieee80211_recalc_ps(local, -1);
697
698 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
699 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
700 /* XXX: for AP_VLAN, actually track AP queues */
701 netif_tx_start_all_queues(dev);
702 } else if (dev) {
703 unsigned long flags;
704 int n_acs = IEEE80211_NUM_ACS;
705 int ac;
706
707 if (local->hw.queues < IEEE80211_NUM_ACS)
708 n_acs = 1;
709
710 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
711 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
712 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
713 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
714 for (ac = 0; ac < n_acs; ac++) {
715 int ac_queue = sdata->vif.hw_queue[ac];
716
717 if (local->queue_stop_reasons[ac_queue] == 0 &&
718 skb_queue_empty(&local->pending[ac_queue]))
719 netif_start_subqueue(dev, ac);
720 }
721 }
722 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
723 }
724
725 return 0;
726 err_del_interface:
727 drv_remove_interface(local, sdata);
728 err_stop:
729 if (!local->open_count)
730 drv_stop(local);
731 err_del_bss:
732 sdata->bss = NULL;
733 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
734 mutex_lock(&local->mtx);
735 list_del(&sdata->u.vlan.list);
736 mutex_unlock(&local->mtx);
737 }
738 /* might already be clear but that doesn't matter */
739 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
740 return res;
741 }
742
743 static int ieee80211_open(struct net_device *dev)
744 {
745 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
746 int err;
747
748 /* fail early if user set an invalid address */
749 if (!is_valid_ether_addr(dev->dev_addr))
750 return -EADDRNOTAVAIL;
751
752 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
753 if (err)
754 return err;
755
756 return ieee80211_do_open(&sdata->wdev, true);
757 }
758
759 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
760 bool going_down)
761 {
762 struct ieee80211_local *local = sdata->local;
763 unsigned long flags;
764 struct sk_buff *skb, *tmp;
765 u32 hw_reconf_flags = 0;
766 int i, flushed;
767 struct ps_data *ps;
768 struct cfg80211_chan_def chandef;
769
770 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
771
772 if (rcu_access_pointer(local->scan_sdata) == sdata)
773 ieee80211_scan_cancel(local);
774
775 /*
776 * Stop TX on this interface first.
777 */
778 if (sdata->dev)
779 netif_tx_stop_all_queues(sdata->dev);
780
781 ieee80211_roc_purge(local, sdata);
782
783 switch (sdata->vif.type) {
784 case NL80211_IFTYPE_STATION:
785 ieee80211_mgd_stop(sdata);
786 break;
787 case NL80211_IFTYPE_ADHOC:
788 ieee80211_ibss_stop(sdata);
789 break;
790 case NL80211_IFTYPE_AP:
791 cancel_work_sync(&sdata->u.ap.request_smps_work);
792 break;
793 default:
794 break;
795 }
796
797 /*
798 * Remove all stations associated with this interface.
799 *
800 * This must be done before calling ops->remove_interface()
801 * because otherwise we can later invoke ops->sta_notify()
802 * whenever the STAs are removed, and that invalidates driver
803 * assumptions about always getting a vif pointer that is valid
804 * (because if we remove a STA after ops->remove_interface()
805 * the driver will have removed the vif info already!)
806 *
807 * This is relevant only in WDS mode, in all other modes we've
808 * already removed all stations when disconnecting or similar,
809 * so warn otherwise.
810 */
811 flushed = sta_info_flush(sdata);
812 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
813 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
814
815 /* don't count this interface for promisc/allmulti while it is down */
816 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
817 atomic_dec(&local->iff_allmultis);
818
819 if (sdata->flags & IEEE80211_SDATA_PROMISC)
820 atomic_dec(&local->iff_promiscs);
821
822 if (sdata->vif.type == NL80211_IFTYPE_AP) {
823 local->fif_pspoll--;
824 local->fif_probe_req--;
825 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
826 local->fif_probe_req--;
827 }
828
829 if (sdata->dev) {
830 netif_addr_lock_bh(sdata->dev);
831 spin_lock_bh(&local->filter_lock);
832 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
833 sdata->dev->addr_len);
834 spin_unlock_bh(&local->filter_lock);
835 netif_addr_unlock_bh(sdata->dev);
836 }
837
838 del_timer_sync(&local->dynamic_ps_timer);
839 cancel_work_sync(&local->dynamic_ps_enable_work);
840
841 cancel_work_sync(&sdata->recalc_smps);
842 sdata_lock(sdata);
843 mutex_lock(&local->mtx);
844 sdata->vif.csa_active = false;
845 if (sdata->csa_block_tx) {
846 ieee80211_wake_vif_queues(local, sdata,
847 IEEE80211_QUEUE_STOP_REASON_CSA);
848 sdata->csa_block_tx = false;
849 }
850 mutex_unlock(&local->mtx);
851 sdata_unlock(sdata);
852
853 cancel_work_sync(&sdata->csa_finalize_work);
854
855 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
856
857 if (sdata->wdev.cac_started) {
858 chandef = sdata->vif.bss_conf.chandef;
859 WARN_ON(local->suspended);
860 mutex_lock(&local->mtx);
861 ieee80211_vif_release_channel(sdata);
862 mutex_unlock(&local->mtx);
863 cfg80211_cac_event(sdata->dev, &chandef,
864 NL80211_RADAR_CAC_ABORTED,
865 GFP_KERNEL);
866 }
867
868 /* APs need special treatment */
869 if (sdata->vif.type == NL80211_IFTYPE_AP) {
870 struct ieee80211_sub_if_data *vlan, *tmpsdata;
871
872 /* down all dependent devices, that is VLANs */
873 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
874 u.vlan.list)
875 dev_close(vlan->dev);
876 WARN_ON(!list_empty(&sdata->u.ap.vlans));
877 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
878 /* remove all packets in parent bc_buf pointing to this dev */
879 ps = &sdata->bss->ps;
880
881 spin_lock_irqsave(&ps->bc_buf.lock, flags);
882 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
883 if (skb->dev == sdata->dev) {
884 __skb_unlink(skb, &ps->bc_buf);
885 local->total_ps_buffered--;
886 ieee80211_free_txskb(&local->hw, skb);
887 }
888 }
889 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
890 }
891
892 if (going_down)
893 local->open_count--;
894
895 switch (sdata->vif.type) {
896 case NL80211_IFTYPE_AP_VLAN:
897 mutex_lock(&local->mtx);
898 list_del(&sdata->u.vlan.list);
899 mutex_unlock(&local->mtx);
900 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
901 /* no need to tell driver */
902 break;
903 case NL80211_IFTYPE_MONITOR:
904 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
905 local->cooked_mntrs--;
906 break;
907 }
908
909 local->monitors--;
910 if (local->monitors == 0) {
911 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
912 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
913 }
914
915 ieee80211_adjust_monitor_flags(sdata, -1);
916 break;
917 case NL80211_IFTYPE_P2P_DEVICE:
918 /* relies on synchronize_rcu() below */
919 RCU_INIT_POINTER(local->p2p_sdata, NULL);
920 /* fall through */
921 default:
922 cancel_work_sync(&sdata->work);
923 /*
924 * When we get here, the interface is marked down.
925 * Free the remaining keys, if there are any
926 * (shouldn't be, except maybe in WDS mode?)
927 *
928 * Force the key freeing to always synchronize_net()
929 * to wait for the RX path in case it is using this
930 * interface enqueuing frames * at this very time on
931 * another CPU.
932 */
933 ieee80211_free_keys(sdata, true);
934
935 /* fall through */
936 case NL80211_IFTYPE_AP:
937 skb_queue_purge(&sdata->skb_queue);
938 }
939
940 sdata->bss = NULL;
941
942 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
943 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
944 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
945 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
946 if (info->control.vif == &sdata->vif) {
947 __skb_unlink(skb, &local->pending[i]);
948 ieee80211_free_txskb(&local->hw, skb);
949 }
950 }
951 }
952 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
953
954 if (local->open_count == 0)
955 ieee80211_clear_tx_pending(local);
956
957 /*
958 * If the interface goes down while suspended, presumably because
959 * the device was unplugged and that happens before our resume,
960 * then the driver is already unconfigured and the remainder of
961 * this function isn't needed.
962 * XXX: what about WoWLAN? If the device has software state, e.g.
963 * memory allocated, it might expect teardown commands from
964 * mac80211 here?
965 */
966 if (local->suspended) {
967 WARN_ON(local->wowlan);
968 WARN_ON(rtnl_dereference(local->monitor_sdata));
969 return;
970 }
971
972 switch (sdata->vif.type) {
973 case NL80211_IFTYPE_AP_VLAN:
974 break;
975 case NL80211_IFTYPE_MONITOR:
976 if (local->monitors == 0)
977 ieee80211_del_virtual_monitor(local);
978
979 mutex_lock(&local->mtx);
980 ieee80211_recalc_idle(local);
981 mutex_unlock(&local->mtx);
982
983 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
984 break;
985
986 /* fall through */
987 default:
988 if (going_down)
989 drv_remove_interface(local, sdata);
990 }
991
992 ieee80211_recalc_ps(local, -1);
993
994 if (local->open_count == 0) {
995 ieee80211_stop_device(local);
996
997 /* no reconfiguring after stop! */
998 return;
999 }
1000
1001 /* do after stop to avoid reconfiguring when we stop anyway */
1002 ieee80211_configure_filter(local);
1003 ieee80211_hw_config(local, hw_reconf_flags);
1004
1005 if (local->monitors == local->open_count)
1006 ieee80211_add_virtual_monitor(local);
1007 }
1008
1009 static int ieee80211_stop(struct net_device *dev)
1010 {
1011 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1012
1013 ieee80211_do_stop(sdata, true);
1014
1015 return 0;
1016 }
1017
1018 static void ieee80211_set_multicast_list(struct net_device *dev)
1019 {
1020 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1021 struct ieee80211_local *local = sdata->local;
1022 int allmulti, promisc, sdata_allmulti, sdata_promisc;
1023
1024 allmulti = !!(dev->flags & IFF_ALLMULTI);
1025 promisc = !!(dev->flags & IFF_PROMISC);
1026 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1027 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1028
1029 if (allmulti != sdata_allmulti) {
1030 if (dev->flags & IFF_ALLMULTI)
1031 atomic_inc(&local->iff_allmultis);
1032 else
1033 atomic_dec(&local->iff_allmultis);
1034 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1035 }
1036
1037 if (promisc != sdata_promisc) {
1038 if (dev->flags & IFF_PROMISC)
1039 atomic_inc(&local->iff_promiscs);
1040 else
1041 atomic_dec(&local->iff_promiscs);
1042 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1043 }
1044 spin_lock_bh(&local->filter_lock);
1045 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1046 spin_unlock_bh(&local->filter_lock);
1047 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1048 }
1049
1050 /*
1051 * Called when the netdev is removed or, by the code below, before
1052 * the interface type changes.
1053 */
1054 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1055 {
1056 int i;
1057
1058 /* free extra data */
1059 ieee80211_free_keys(sdata, false);
1060
1061 ieee80211_debugfs_remove_netdev(sdata);
1062
1063 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1064 __skb_queue_purge(&sdata->fragments[i].skb_list);
1065 sdata->fragment_next = 0;
1066
1067 if (ieee80211_vif_is_mesh(&sdata->vif))
1068 mesh_rmc_free(sdata);
1069 }
1070
1071 static void ieee80211_uninit(struct net_device *dev)
1072 {
1073 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1074 }
1075
1076 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1077 struct sk_buff *skb,
1078 void *accel_priv,
1079 select_queue_fallback_t fallback)
1080 {
1081 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1082 }
1083
1084 static const struct net_device_ops ieee80211_dataif_ops = {
1085 .ndo_open = ieee80211_open,
1086 .ndo_stop = ieee80211_stop,
1087 .ndo_uninit = ieee80211_uninit,
1088 .ndo_start_xmit = ieee80211_subif_start_xmit,
1089 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1090 .ndo_change_mtu = ieee80211_change_mtu,
1091 .ndo_set_mac_address = ieee80211_change_mac,
1092 .ndo_select_queue = ieee80211_netdev_select_queue,
1093 };
1094
1095 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1096 struct sk_buff *skb,
1097 void *accel_priv,
1098 select_queue_fallback_t fallback)
1099 {
1100 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1101 struct ieee80211_local *local = sdata->local;
1102 struct ieee80211_hdr *hdr;
1103 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1104
1105 if (local->hw.queues < IEEE80211_NUM_ACS)
1106 return 0;
1107
1108 if (skb->len < 4 ||
1109 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1110 return 0; /* doesn't matter, frame will be dropped */
1111
1112 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1113
1114 return ieee80211_select_queue_80211(sdata, skb, hdr);
1115 }
1116
1117 static const struct net_device_ops ieee80211_monitorif_ops = {
1118 .ndo_open = ieee80211_open,
1119 .ndo_stop = ieee80211_stop,
1120 .ndo_uninit = ieee80211_uninit,
1121 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1122 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1123 .ndo_change_mtu = ieee80211_change_mtu,
1124 .ndo_set_mac_address = ieee80211_change_mac,
1125 .ndo_select_queue = ieee80211_monitor_select_queue,
1126 };
1127
1128 static void ieee80211_if_setup(struct net_device *dev)
1129 {
1130 ether_setup(dev);
1131 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1132 dev->netdev_ops = &ieee80211_dataif_ops;
1133 dev->destructor = free_netdev;
1134 }
1135
1136 static void ieee80211_iface_work(struct work_struct *work)
1137 {
1138 struct ieee80211_sub_if_data *sdata =
1139 container_of(work, struct ieee80211_sub_if_data, work);
1140 struct ieee80211_local *local = sdata->local;
1141 struct sk_buff *skb;
1142 struct sta_info *sta;
1143 struct ieee80211_ra_tid *ra_tid;
1144 struct ieee80211_rx_agg *rx_agg;
1145
1146 if (!ieee80211_sdata_running(sdata))
1147 return;
1148
1149 if (local->scanning)
1150 return;
1151
1152 /*
1153 * ieee80211_queue_work() should have picked up most cases,
1154 * here we'll pick the rest.
1155 */
1156 if (WARN(local->suspended,
1157 "interface work scheduled while going to suspend\n"))
1158 return;
1159
1160 /* first process frames */
1161 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1162 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1163
1164 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1165 ra_tid = (void *)&skb->cb;
1166 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1167 ra_tid->tid);
1168 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1169 ra_tid = (void *)&skb->cb;
1170 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1171 ra_tid->tid);
1172 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1173 rx_agg = (void *)&skb->cb;
1174 mutex_lock(&local->sta_mtx);
1175 sta = sta_info_get_bss(sdata, rx_agg->addr);
1176 if (sta)
1177 __ieee80211_start_rx_ba_session(sta,
1178 0, 0, 0, 1, rx_agg->tid,
1179 IEEE80211_MAX_AMPDU_BUF,
1180 false, true);
1181 mutex_unlock(&local->sta_mtx);
1182 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1183 rx_agg = (void *)&skb->cb;
1184 mutex_lock(&local->sta_mtx);
1185 sta = sta_info_get_bss(sdata, rx_agg->addr);
1186 if (sta)
1187 __ieee80211_stop_rx_ba_session(sta,
1188 rx_agg->tid,
1189 WLAN_BACK_RECIPIENT, 0,
1190 false);
1191 mutex_unlock(&local->sta_mtx);
1192 } else if (ieee80211_is_action(mgmt->frame_control) &&
1193 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1194 int len = skb->len;
1195
1196 mutex_lock(&local->sta_mtx);
1197 sta = sta_info_get_bss(sdata, mgmt->sa);
1198 if (sta) {
1199 switch (mgmt->u.action.u.addba_req.action_code) {
1200 case WLAN_ACTION_ADDBA_REQ:
1201 ieee80211_process_addba_request(
1202 local, sta, mgmt, len);
1203 break;
1204 case WLAN_ACTION_ADDBA_RESP:
1205 ieee80211_process_addba_resp(local, sta,
1206 mgmt, len);
1207 break;
1208 case WLAN_ACTION_DELBA:
1209 ieee80211_process_delba(sdata, sta,
1210 mgmt, len);
1211 break;
1212 default:
1213 WARN_ON(1);
1214 break;
1215 }
1216 }
1217 mutex_unlock(&local->sta_mtx);
1218 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1219 struct ieee80211_hdr *hdr = (void *)mgmt;
1220 /*
1221 * So the frame isn't mgmt, but frame_control
1222 * is at the right place anyway, of course, so
1223 * the if statement is correct.
1224 *
1225 * Warn if we have other data frame types here,
1226 * they must not get here.
1227 */
1228 WARN_ON(hdr->frame_control &
1229 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1230 WARN_ON(!(hdr->seq_ctrl &
1231 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1232 /*
1233 * This was a fragment of a frame, received while
1234 * a block-ack session was active. That cannot be
1235 * right, so terminate the session.
1236 */
1237 mutex_lock(&local->sta_mtx);
1238 sta = sta_info_get_bss(sdata, mgmt->sa);
1239 if (sta) {
1240 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1241 IEEE80211_QOS_CTL_TID_MASK;
1242
1243 __ieee80211_stop_rx_ba_session(
1244 sta, tid, WLAN_BACK_RECIPIENT,
1245 WLAN_REASON_QSTA_REQUIRE_SETUP,
1246 true);
1247 }
1248 mutex_unlock(&local->sta_mtx);
1249 } else switch (sdata->vif.type) {
1250 case NL80211_IFTYPE_STATION:
1251 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1252 break;
1253 case NL80211_IFTYPE_ADHOC:
1254 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1255 break;
1256 case NL80211_IFTYPE_MESH_POINT:
1257 if (!ieee80211_vif_is_mesh(&sdata->vif))
1258 break;
1259 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1260 break;
1261 default:
1262 WARN(1, "frame for unexpected interface type");
1263 break;
1264 }
1265
1266 kfree_skb(skb);
1267 }
1268
1269 /* then other type-dependent work */
1270 switch (sdata->vif.type) {
1271 case NL80211_IFTYPE_STATION:
1272 ieee80211_sta_work(sdata);
1273 break;
1274 case NL80211_IFTYPE_ADHOC:
1275 ieee80211_ibss_work(sdata);
1276 break;
1277 case NL80211_IFTYPE_MESH_POINT:
1278 if (!ieee80211_vif_is_mesh(&sdata->vif))
1279 break;
1280 ieee80211_mesh_work(sdata);
1281 break;
1282 default:
1283 break;
1284 }
1285 }
1286
1287 static void ieee80211_recalc_smps_work(struct work_struct *work)
1288 {
1289 struct ieee80211_sub_if_data *sdata =
1290 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1291
1292 ieee80211_recalc_smps(sdata);
1293 }
1294
1295 /*
1296 * Helper function to initialise an interface to a specific type.
1297 */
1298 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1299 enum nl80211_iftype type)
1300 {
1301 /* clear type-dependent union */
1302 memset(&sdata->u, 0, sizeof(sdata->u));
1303
1304 /* and set some type-dependent values */
1305 sdata->vif.type = type;
1306 sdata->vif.p2p = false;
1307 sdata->wdev.iftype = type;
1308
1309 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1310 sdata->control_port_no_encrypt = false;
1311 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1312 sdata->vif.bss_conf.idle = true;
1313
1314 sdata->noack_map = 0;
1315
1316 /* only monitor/p2p-device differ */
1317 if (sdata->dev) {
1318 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1319 sdata->dev->type = ARPHRD_ETHER;
1320 }
1321
1322 skb_queue_head_init(&sdata->skb_queue);
1323 INIT_WORK(&sdata->work, ieee80211_iface_work);
1324 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1325 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1326 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1327 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1328
1329 switch (type) {
1330 case NL80211_IFTYPE_P2P_GO:
1331 type = NL80211_IFTYPE_AP;
1332 sdata->vif.type = type;
1333 sdata->vif.p2p = true;
1334 /* fall through */
1335 case NL80211_IFTYPE_AP:
1336 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1337 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1338 INIT_WORK(&sdata->u.ap.request_smps_work,
1339 ieee80211_request_smps_ap_work);
1340 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1341 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1342 break;
1343 case NL80211_IFTYPE_P2P_CLIENT:
1344 type = NL80211_IFTYPE_STATION;
1345 sdata->vif.type = type;
1346 sdata->vif.p2p = true;
1347 /* fall through */
1348 case NL80211_IFTYPE_STATION:
1349 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1350 ieee80211_sta_setup_sdata(sdata);
1351 break;
1352 case NL80211_IFTYPE_ADHOC:
1353 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1354 ieee80211_ibss_setup_sdata(sdata);
1355 break;
1356 case NL80211_IFTYPE_MESH_POINT:
1357 if (ieee80211_vif_is_mesh(&sdata->vif))
1358 ieee80211_mesh_init_sdata(sdata);
1359 break;
1360 case NL80211_IFTYPE_MONITOR:
1361 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1362 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1363 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1364 MONITOR_FLAG_OTHER_BSS;
1365 break;
1366 case NL80211_IFTYPE_WDS:
1367 sdata->vif.bss_conf.bssid = NULL;
1368 break;
1369 case NL80211_IFTYPE_AP_VLAN:
1370 case NL80211_IFTYPE_P2P_DEVICE:
1371 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1372 break;
1373 case NL80211_IFTYPE_UNSPECIFIED:
1374 case NUM_NL80211_IFTYPES:
1375 BUG();
1376 break;
1377 }
1378
1379 ieee80211_debugfs_add_netdev(sdata);
1380 }
1381
1382 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1383 enum nl80211_iftype type)
1384 {
1385 struct ieee80211_local *local = sdata->local;
1386 int ret, err;
1387 enum nl80211_iftype internal_type = type;
1388 bool p2p = false;
1389
1390 ASSERT_RTNL();
1391
1392 if (!local->ops->change_interface)
1393 return -EBUSY;
1394
1395 switch (sdata->vif.type) {
1396 case NL80211_IFTYPE_AP:
1397 case NL80211_IFTYPE_STATION:
1398 case NL80211_IFTYPE_ADHOC:
1399 /*
1400 * Could maybe also all others here?
1401 * Just not sure how that interacts
1402 * with the RX/config path e.g. for
1403 * mesh.
1404 */
1405 break;
1406 default:
1407 return -EBUSY;
1408 }
1409
1410 switch (type) {
1411 case NL80211_IFTYPE_AP:
1412 case NL80211_IFTYPE_STATION:
1413 case NL80211_IFTYPE_ADHOC:
1414 /*
1415 * Could probably support everything
1416 * but WDS here (WDS do_open can fail
1417 * under memory pressure, which this
1418 * code isn't prepared to handle).
1419 */
1420 break;
1421 case NL80211_IFTYPE_P2P_CLIENT:
1422 p2p = true;
1423 internal_type = NL80211_IFTYPE_STATION;
1424 break;
1425 case NL80211_IFTYPE_P2P_GO:
1426 p2p = true;
1427 internal_type = NL80211_IFTYPE_AP;
1428 break;
1429 default:
1430 return -EBUSY;
1431 }
1432
1433 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1434 if (ret)
1435 return ret;
1436
1437 ieee80211_do_stop(sdata, false);
1438
1439 ieee80211_teardown_sdata(sdata);
1440
1441 ret = drv_change_interface(local, sdata, internal_type, p2p);
1442 if (ret)
1443 type = ieee80211_vif_type_p2p(&sdata->vif);
1444
1445 /*
1446 * Ignore return value here, there's not much we can do since
1447 * the driver changed the interface type internally already.
1448 * The warnings will hopefully make driver authors fix it :-)
1449 */
1450 ieee80211_check_queues(sdata, type);
1451
1452 ieee80211_setup_sdata(sdata, type);
1453
1454 err = ieee80211_do_open(&sdata->wdev, false);
1455 WARN(err, "type change: do_open returned %d", err);
1456
1457 return ret;
1458 }
1459
1460 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1461 enum nl80211_iftype type)
1462 {
1463 int ret;
1464
1465 ASSERT_RTNL();
1466
1467 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1468 return 0;
1469
1470 if (ieee80211_sdata_running(sdata)) {
1471 ret = ieee80211_runtime_change_iftype(sdata, type);
1472 if (ret)
1473 return ret;
1474 } else {
1475 /* Purge and reset type-dependent state. */
1476 ieee80211_teardown_sdata(sdata);
1477 ieee80211_setup_sdata(sdata, type);
1478 }
1479
1480 /* reset some values that shouldn't be kept across type changes */
1481 sdata->drop_unencrypted = 0;
1482 if (type == NL80211_IFTYPE_STATION)
1483 sdata->u.mgd.use_4addr = false;
1484
1485 return 0;
1486 }
1487
1488 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1489 u8 *perm_addr, enum nl80211_iftype type)
1490 {
1491 struct ieee80211_sub_if_data *sdata;
1492 u64 mask, start, addr, val, inc;
1493 u8 *m;
1494 u8 tmp_addr[ETH_ALEN];
1495 int i;
1496
1497 /* default ... something at least */
1498 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1499
1500 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1501 local->hw.wiphy->n_addresses <= 1)
1502 return;
1503
1504 mutex_lock(&local->iflist_mtx);
1505
1506 switch (type) {
1507 case NL80211_IFTYPE_MONITOR:
1508 /* doesn't matter */
1509 break;
1510 case NL80211_IFTYPE_WDS:
1511 case NL80211_IFTYPE_AP_VLAN:
1512 /* match up with an AP interface */
1513 list_for_each_entry(sdata, &local->interfaces, list) {
1514 if (sdata->vif.type != NL80211_IFTYPE_AP)
1515 continue;
1516 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1517 break;
1518 }
1519 /* keep default if no AP interface present */
1520 break;
1521 case NL80211_IFTYPE_P2P_CLIENT:
1522 case NL80211_IFTYPE_P2P_GO:
1523 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1524 list_for_each_entry(sdata, &local->interfaces, list) {
1525 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1526 continue;
1527 if (!ieee80211_sdata_running(sdata))
1528 continue;
1529 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1530 goto out_unlock;
1531 }
1532 }
1533 /* otherwise fall through */
1534 default:
1535 /* assign a new address if possible -- try n_addresses first */
1536 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1537 bool used = false;
1538
1539 list_for_each_entry(sdata, &local->interfaces, list) {
1540 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1541 sdata->vif.addr)) {
1542 used = true;
1543 break;
1544 }
1545 }
1546
1547 if (!used) {
1548 memcpy(perm_addr,
1549 local->hw.wiphy->addresses[i].addr,
1550 ETH_ALEN);
1551 break;
1552 }
1553 }
1554
1555 /* try mask if available */
1556 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1557 break;
1558
1559 m = local->hw.wiphy->addr_mask;
1560 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1561 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1562 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1563
1564 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1565 /* not a contiguous mask ... not handled now! */
1566 pr_info("not contiguous\n");
1567 break;
1568 }
1569
1570 /*
1571 * Pick address of existing interface in case user changed
1572 * MAC address manually, default to perm_addr.
1573 */
1574 m = local->hw.wiphy->perm_addr;
1575 list_for_each_entry(sdata, &local->interfaces, list) {
1576 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1577 continue;
1578 m = sdata->vif.addr;
1579 break;
1580 }
1581 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1582 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1583 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1584
1585 inc = 1ULL<<__ffs64(mask);
1586 val = (start & mask);
1587 addr = (start & ~mask) | (val & mask);
1588 do {
1589 bool used = false;
1590
1591 tmp_addr[5] = addr >> 0*8;
1592 tmp_addr[4] = addr >> 1*8;
1593 tmp_addr[3] = addr >> 2*8;
1594 tmp_addr[2] = addr >> 3*8;
1595 tmp_addr[1] = addr >> 4*8;
1596 tmp_addr[0] = addr >> 5*8;
1597
1598 val += inc;
1599
1600 list_for_each_entry(sdata, &local->interfaces, list) {
1601 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1602 used = true;
1603 break;
1604 }
1605 }
1606
1607 if (!used) {
1608 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1609 break;
1610 }
1611 addr = (start & ~mask) | (val & mask);
1612 } while (addr != start);
1613
1614 break;
1615 }
1616
1617 out_unlock:
1618 mutex_unlock(&local->iflist_mtx);
1619 }
1620
1621 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1622 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1623 struct vif_params *params)
1624 {
1625 struct net_device *ndev = NULL;
1626 struct ieee80211_sub_if_data *sdata = NULL;
1627 int ret, i;
1628 int txqs = 1;
1629
1630 ASSERT_RTNL();
1631
1632 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1633 struct wireless_dev *wdev;
1634
1635 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1636 GFP_KERNEL);
1637 if (!sdata)
1638 return -ENOMEM;
1639 wdev = &sdata->wdev;
1640
1641 sdata->dev = NULL;
1642 strlcpy(sdata->name, name, IFNAMSIZ);
1643 ieee80211_assign_perm_addr(local, wdev->address, type);
1644 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1645 } else {
1646 if (local->hw.queues >= IEEE80211_NUM_ACS)
1647 txqs = IEEE80211_NUM_ACS;
1648
1649 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1650 name, NET_NAME_UNKNOWN,
1651 ieee80211_if_setup, txqs, 1);
1652 if (!ndev)
1653 return -ENOMEM;
1654 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1655
1656 ndev->needed_headroom = local->tx_headroom +
1657 4*6 /* four MAC addresses */
1658 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1659 + 6 /* mesh */
1660 + 8 /* rfc1042/bridge tunnel */
1661 - ETH_HLEN /* ethernet hard_header_len */
1662 + IEEE80211_ENCRYPT_HEADROOM;
1663 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1664
1665 ret = dev_alloc_name(ndev, ndev->name);
1666 if (ret < 0) {
1667 free_netdev(ndev);
1668 return ret;
1669 }
1670
1671 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1672 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1673 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1674
1675 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1676 sdata = netdev_priv(ndev);
1677 ndev->ieee80211_ptr = &sdata->wdev;
1678 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1679 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1680
1681 sdata->dev = ndev;
1682 }
1683
1684 /* initialise type-independent data */
1685 sdata->wdev.wiphy = local->hw.wiphy;
1686 sdata->local = local;
1687
1688 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1689 skb_queue_head_init(&sdata->fragments[i].skb_list);
1690
1691 INIT_LIST_HEAD(&sdata->key_list);
1692
1693 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1694 ieee80211_dfs_cac_timer_work);
1695 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1696 ieee80211_delayed_tailroom_dec);
1697
1698 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1699 struct ieee80211_supported_band *sband;
1700 sband = local->hw.wiphy->bands[i];
1701 sdata->rc_rateidx_mask[i] =
1702 sband ? (1 << sband->n_bitrates) - 1 : 0;
1703 if (sband)
1704 memcpy(sdata->rc_rateidx_mcs_mask[i],
1705 sband->ht_cap.mcs.rx_mask,
1706 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1707 else
1708 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1709 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1710 }
1711
1712 ieee80211_set_default_queues(sdata);
1713
1714 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1715 sdata->user_power_level = local->user_power_level;
1716
1717 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1718
1719 /* setup type-dependent data */
1720 ieee80211_setup_sdata(sdata, type);
1721
1722 if (ndev) {
1723 if (params) {
1724 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1725 if (type == NL80211_IFTYPE_STATION)
1726 sdata->u.mgd.use_4addr = params->use_4addr;
1727 }
1728
1729 ndev->features |= local->hw.netdev_features;
1730
1731 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1732
1733 ret = register_netdevice(ndev);
1734 if (ret) {
1735 free_netdev(ndev);
1736 return ret;
1737 }
1738 }
1739
1740 mutex_lock(&local->iflist_mtx);
1741 list_add_tail_rcu(&sdata->list, &local->interfaces);
1742 mutex_unlock(&local->iflist_mtx);
1743
1744 if (new_wdev)
1745 *new_wdev = &sdata->wdev;
1746
1747 return 0;
1748 }
1749
1750 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1751 {
1752 ASSERT_RTNL();
1753
1754 mutex_lock(&sdata->local->iflist_mtx);
1755 list_del_rcu(&sdata->list);
1756 mutex_unlock(&sdata->local->iflist_mtx);
1757
1758 synchronize_rcu();
1759
1760 if (sdata->dev) {
1761 unregister_netdevice(sdata->dev);
1762 } else {
1763 cfg80211_unregister_wdev(&sdata->wdev);
1764 kfree(sdata);
1765 }
1766 }
1767
1768 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1769 {
1770 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1771 return;
1772 ieee80211_do_stop(sdata, true);
1773 ieee80211_teardown_sdata(sdata);
1774 }
1775
1776 /*
1777 * Remove all interfaces, may only be called at hardware unregistration
1778 * time because it doesn't do RCU-safe list removals.
1779 */
1780 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1781 {
1782 struct ieee80211_sub_if_data *sdata, *tmp;
1783 LIST_HEAD(unreg_list);
1784 LIST_HEAD(wdev_list);
1785
1786 ASSERT_RTNL();
1787
1788 /*
1789 * Close all AP_VLAN interfaces first, as otherwise they
1790 * might be closed while the AP interface they belong to
1791 * is closed, causing unregister_netdevice_many() to crash.
1792 */
1793 list_for_each_entry(sdata, &local->interfaces, list)
1794 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1795 dev_close(sdata->dev);
1796
1797 mutex_lock(&local->iflist_mtx);
1798 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1799 list_del(&sdata->list);
1800
1801 if (sdata->dev)
1802 unregister_netdevice_queue(sdata->dev, &unreg_list);
1803 else
1804 list_add(&sdata->list, &wdev_list);
1805 }
1806 mutex_unlock(&local->iflist_mtx);
1807 unregister_netdevice_many(&unreg_list);
1808
1809 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1810 list_del(&sdata->list);
1811 cfg80211_unregister_wdev(&sdata->wdev);
1812 kfree(sdata);
1813 }
1814 }
1815
1816 static int netdev_notify(struct notifier_block *nb,
1817 unsigned long state, void *ptr)
1818 {
1819 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1820 struct ieee80211_sub_if_data *sdata;
1821
1822 if (state != NETDEV_CHANGENAME)
1823 return NOTIFY_DONE;
1824
1825 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1826 return NOTIFY_DONE;
1827
1828 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1829 return NOTIFY_DONE;
1830
1831 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1832 memcpy(sdata->name, dev->name, IFNAMSIZ);
1833 ieee80211_debugfs_rename_netdev(sdata);
1834
1835 return NOTIFY_OK;
1836 }
1837
1838 static struct notifier_block mac80211_netdev_notifier = {
1839 .notifier_call = netdev_notify,
1840 };
1841
1842 int ieee80211_iface_init(void)
1843 {
1844 return register_netdevice_notifier(&mac80211_netdev_notifier);
1845 }
1846
1847 void ieee80211_iface_exit(void)
1848 {
1849 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1850 }
Linux with added FPC-III support