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net: core: explicitly select a txq before doing l2 forwarding
[deliverable/linux.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling
3 *
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28
29 /**
30 * DOC: Interface list locking
31 *
32 * The interface list in each struct ieee80211_local is protected
33 * three-fold:
34 *
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
37 * the iflist_mtx.
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
40 *
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
43 */
44
45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 int power;
49
50 rcu_read_lock();
51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 if (!chanctx_conf) {
53 rcu_read_unlock();
54 return false;
55 }
56
57 power = ieee80211_chandef_max_power(&chanctx_conf->def);
58 rcu_read_unlock();
59
60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 power = min(power, sdata->user_power_level);
62
63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->ap_power_level);
65
66 if (power != sdata->vif.bss_conf.txpower) {
67 sdata->vif.bss_conf.txpower = power;
68 ieee80211_hw_config(sdata->local, 0);
69 return true;
70 }
71
72 return false;
73 }
74
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 if (__ieee80211_recalc_txpower(sdata))
78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80
81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
82 {
83 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84 return 0;
85
86 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87 return IEEE80211_CONF_CHANGE_IDLE;
88 }
89
90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
91 {
92 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93 return 0;
94
95 ieee80211_flush_queues(local, NULL);
96
97 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 return IEEE80211_CONF_CHANGE_IDLE;
99 }
100
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102 bool force_active)
103 {
104 bool working = false, scanning, active;
105 unsigned int led_trig_start = 0, led_trig_stop = 0;
106 struct ieee80211_roc_work *roc;
107
108 lockdep_assert_held(&local->mtx);
109
110 active = force_active ||
111 !list_empty(&local->chanctx_list) ||
112 local->monitors;
113
114 if (!local->ops->remain_on_channel) {
115 list_for_each_entry(roc, &local->roc_list, list) {
116 working = true;
117 break;
118 }
119 }
120
121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124 if (working || scanning)
125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 else
127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129 if (active)
130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 else
132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135
136 if (working || scanning || active)
137 return __ieee80211_idle_off(local);
138 return __ieee80211_idle_on(local);
139 }
140
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 return __ieee80211_recalc_idle(local, true);
144 }
145
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 u32 change = __ieee80211_recalc_idle(local, false);
149 if (change)
150 ieee80211_hw_config(local, change);
151 }
152
153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
154 {
155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156 return -EINVAL;
157
158 dev->mtu = new_mtu;
159 return 0;
160 }
161
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
163 bool check_dup)
164 {
165 struct ieee80211_local *local = sdata->local;
166 struct ieee80211_sub_if_data *iter;
167 u64 new, mask, tmp;
168 u8 *m;
169 int ret = 0;
170
171 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172 return 0;
173
174 m = addr;
175 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178
179 m = local->hw.wiphy->addr_mask;
180 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183
184 if (!check_dup)
185 return ret;
186
187 mutex_lock(&local->iflist_mtx);
188 list_for_each_entry(iter, &local->interfaces, list) {
189 if (iter == sdata)
190 continue;
191
192 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
194 continue;
195
196 m = iter->vif.addr;
197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200
201 if ((new & ~mask) != (tmp & ~mask)) {
202 ret = -EINVAL;
203 break;
204 }
205 }
206 mutex_unlock(&local->iflist_mtx);
207
208 return ret;
209 }
210
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214 struct sockaddr *sa = addr;
215 bool check_dup = true;
216 int ret;
217
218 if (ieee80211_sdata_running(sdata))
219 return -EBUSY;
220
221 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
223 check_dup = false;
224
225 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226 if (ret)
227 return ret;
228
229 ret = eth_mac_addr(dev, sa);
230
231 if (ret == 0)
232 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233
234 return ret;
235 }
236
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239 return type1 == NL80211_IFTYPE_MONITOR ||
240 type2 == NL80211_IFTYPE_MONITOR ||
241 type1 == NL80211_IFTYPE_P2P_DEVICE ||
242 type2 == NL80211_IFTYPE_P2P_DEVICE ||
243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244 (type1 == NL80211_IFTYPE_WDS &&
245 (type2 == NL80211_IFTYPE_WDS ||
246 type2 == NL80211_IFTYPE_AP)) ||
247 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248 (type1 == NL80211_IFTYPE_AP_VLAN &&
249 (type2 == NL80211_IFTYPE_AP ||
250 type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254 enum nl80211_iftype iftype)
255 {
256 struct ieee80211_local *local = sdata->local;
257 struct ieee80211_sub_if_data *nsdata;
258
259 ASSERT_RTNL();
260
261 /* we hold the RTNL here so can safely walk the list */
262 list_for_each_entry(nsdata, &local->interfaces, list) {
263 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
264 /*
265 * Allow only a single IBSS interface to be up at any
266 * time. This is restricted because beacon distribution
267 * cannot work properly if both are in the same IBSS.
268 *
269 * To remove this restriction we'd have to disallow them
270 * from setting the same SSID on different IBSS interfaces
271 * belonging to the same hardware. Then, however, we're
272 * faced with having to adopt two different TSF timers...
273 */
274 if (iftype == NL80211_IFTYPE_ADHOC &&
275 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276 return -EBUSY;
277 /*
278 * will not add another interface while any channel
279 * switch is active.
280 */
281 if (nsdata->vif.csa_active)
282 return -EBUSY;
283
284 /*
285 * The remaining checks are only performed for interfaces
286 * with the same MAC address.
287 */
288 if (!ether_addr_equal(sdata->vif.addr,
289 nsdata->vif.addr))
290 continue;
291
292 /*
293 * check whether it may have the same address
294 */
295 if (!identical_mac_addr_allowed(iftype,
296 nsdata->vif.type))
297 return -ENOTUNIQ;
298
299 /*
300 * can only add VLANs to enabled APs
301 */
302 if (iftype == NL80211_IFTYPE_AP_VLAN &&
303 nsdata->vif.type == NL80211_IFTYPE_AP)
304 sdata->bss = &nsdata->u.ap;
305 }
306 }
307
308 return 0;
309 }
310
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 enum nl80211_iftype iftype)
313 {
314 int n_queues = sdata->local->hw.queues;
315 int i;
316
317 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
318 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320 IEEE80211_INVAL_HW_QUEUE))
321 return -EINVAL;
322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323 n_queues))
324 return -EINVAL;
325 }
326 }
327
328 if ((iftype != NL80211_IFTYPE_AP &&
329 iftype != NL80211_IFTYPE_P2P_GO &&
330 iftype != NL80211_IFTYPE_MESH_POINT) ||
331 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333 return 0;
334 }
335
336 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337 return -EINVAL;
338
339 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340 return -EINVAL;
341
342 return 0;
343 }
344
345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346 const int offset)
347 {
348 struct ieee80211_local *local = sdata->local;
349 u32 flags = sdata->u.mntr_flags;
350
351 #define ADJUST(_f, _s) do { \
352 if (flags & MONITOR_FLAG_##_f) \
353 local->fif_##_s += offset; \
354 } while (0)
355
356 ADJUST(FCSFAIL, fcsfail);
357 ADJUST(PLCPFAIL, plcpfail);
358 ADJUST(CONTROL, control);
359 ADJUST(CONTROL, pspoll);
360 ADJUST(OTHER_BSS, other_bss);
361
362 #undef ADJUST
363 }
364
365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367 struct ieee80211_local *local = sdata->local;
368 int i;
369
370 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373 else if (local->hw.queues >= IEEE80211_NUM_ACS)
374 sdata->vif.hw_queue[i] = i;
375 else
376 sdata->vif.hw_queue[i] = 0;
377 }
378 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380
381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383 struct ieee80211_sub_if_data *sdata;
384 int ret;
385
386 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387 return 0;
388
389 ASSERT_RTNL();
390
391 if (local->monitor_sdata)
392 return 0;
393
394 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395 if (!sdata)
396 return -ENOMEM;
397
398 /* set up data */
399 sdata->local = local;
400 sdata->vif.type = NL80211_IFTYPE_MONITOR;
401 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402 wiphy_name(local->hw.wiphy));
403
404 ieee80211_set_default_queues(sdata);
405
406 ret = drv_add_interface(local, sdata);
407 if (WARN_ON(ret)) {
408 /* ok .. stupid driver, it asked for this! */
409 kfree(sdata);
410 return ret;
411 }
412
413 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
414 if (ret) {
415 kfree(sdata);
416 return ret;
417 }
418
419 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
420 IEEE80211_CHANCTX_EXCLUSIVE);
421 if (ret) {
422 drv_remove_interface(local, sdata);
423 kfree(sdata);
424 return ret;
425 }
426
427 mutex_lock(&local->iflist_mtx);
428 rcu_assign_pointer(local->monitor_sdata, sdata);
429 mutex_unlock(&local->iflist_mtx);
430
431 return 0;
432 }
433
434 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
435 {
436 struct ieee80211_sub_if_data *sdata;
437
438 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
439 return;
440
441 ASSERT_RTNL();
442
443 mutex_lock(&local->iflist_mtx);
444
445 sdata = rcu_dereference_protected(local->monitor_sdata,
446 lockdep_is_held(&local->iflist_mtx));
447 if (!sdata) {
448 mutex_unlock(&local->iflist_mtx);
449 return;
450 }
451
452 rcu_assign_pointer(local->monitor_sdata, NULL);
453 mutex_unlock(&local->iflist_mtx);
454
455 synchronize_net();
456
457 ieee80211_vif_release_channel(sdata);
458
459 drv_remove_interface(local, sdata);
460
461 kfree(sdata);
462 }
463
464 /*
465 * NOTE: Be very careful when changing this function, it must NOT return
466 * an error on interface type changes that have been pre-checked, so most
467 * checks should be in ieee80211_check_concurrent_iface.
468 */
469 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
470 {
471 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
472 struct net_device *dev = wdev->netdev;
473 struct ieee80211_local *local = sdata->local;
474 struct sta_info *sta;
475 u32 changed = 0;
476 int res;
477 u32 hw_reconf_flags = 0;
478
479 switch (sdata->vif.type) {
480 case NL80211_IFTYPE_WDS:
481 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
482 return -ENOLINK;
483 break;
484 case NL80211_IFTYPE_AP_VLAN: {
485 struct ieee80211_sub_if_data *master;
486
487 if (!sdata->bss)
488 return -ENOLINK;
489
490 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
491
492 master = container_of(sdata->bss,
493 struct ieee80211_sub_if_data, u.ap);
494 sdata->control_port_protocol =
495 master->control_port_protocol;
496 sdata->control_port_no_encrypt =
497 master->control_port_no_encrypt;
498 sdata->vif.cab_queue = master->vif.cab_queue;
499 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
500 sizeof(sdata->vif.hw_queue));
501 break;
502 }
503 case NL80211_IFTYPE_AP:
504 sdata->bss = &sdata->u.ap;
505 break;
506 case NL80211_IFTYPE_MESH_POINT:
507 case NL80211_IFTYPE_STATION:
508 case NL80211_IFTYPE_MONITOR:
509 case NL80211_IFTYPE_ADHOC:
510 case NL80211_IFTYPE_P2P_DEVICE:
511 /* no special treatment */
512 break;
513 case NL80211_IFTYPE_UNSPECIFIED:
514 case NUM_NL80211_IFTYPES:
515 case NL80211_IFTYPE_P2P_CLIENT:
516 case NL80211_IFTYPE_P2P_GO:
517 /* cannot happen */
518 WARN_ON(1);
519 break;
520 }
521
522 if (local->open_count == 0) {
523 res = drv_start(local);
524 if (res)
525 goto err_del_bss;
526 /* we're brought up, everything changes */
527 hw_reconf_flags = ~0;
528 ieee80211_led_radio(local, true);
529 ieee80211_mod_tpt_led_trig(local,
530 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
531 }
532
533 /*
534 * Copy the hopefully now-present MAC address to
535 * this interface, if it has the special null one.
536 */
537 if (dev && is_zero_ether_addr(dev->dev_addr)) {
538 memcpy(dev->dev_addr,
539 local->hw.wiphy->perm_addr,
540 ETH_ALEN);
541 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
542
543 if (!is_valid_ether_addr(dev->dev_addr)) {
544 res = -EADDRNOTAVAIL;
545 goto err_stop;
546 }
547 }
548
549 switch (sdata->vif.type) {
550 case NL80211_IFTYPE_AP_VLAN:
551 /* no need to tell driver, but set carrier and chanctx */
552 if (rtnl_dereference(sdata->bss->beacon)) {
553 ieee80211_vif_vlan_copy_chanctx(sdata);
554 netif_carrier_on(dev);
555 } else {
556 netif_carrier_off(dev);
557 }
558 break;
559 case NL80211_IFTYPE_MONITOR:
560 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
561 local->cooked_mntrs++;
562 break;
563 }
564
565 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
566 res = drv_add_interface(local, sdata);
567 if (res)
568 goto err_stop;
569 } else if (local->monitors == 0 && local->open_count == 0) {
570 res = ieee80211_add_virtual_monitor(local);
571 if (res)
572 goto err_stop;
573 }
574
575 /* must be before the call to ieee80211_configure_filter */
576 local->monitors++;
577 if (local->monitors == 1) {
578 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
579 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
580 }
581
582 ieee80211_adjust_monitor_flags(sdata, 1);
583 ieee80211_configure_filter(local);
584 mutex_lock(&local->mtx);
585 ieee80211_recalc_idle(local);
586 mutex_unlock(&local->mtx);
587
588 netif_carrier_on(dev);
589 break;
590 default:
591 if (coming_up) {
592 ieee80211_del_virtual_monitor(local);
593
594 res = drv_add_interface(local, sdata);
595 if (res)
596 goto err_stop;
597 res = ieee80211_check_queues(sdata,
598 ieee80211_vif_type_p2p(&sdata->vif));
599 if (res)
600 goto err_del_interface;
601 }
602
603 if (sdata->vif.type == NL80211_IFTYPE_AP) {
604 local->fif_pspoll++;
605 local->fif_probe_req++;
606
607 ieee80211_configure_filter(local);
608 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
609 local->fif_probe_req++;
610 }
611
612 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
613 changed |= ieee80211_reset_erp_info(sdata);
614 ieee80211_bss_info_change_notify(sdata, changed);
615
616 switch (sdata->vif.type) {
617 case NL80211_IFTYPE_STATION:
618 case NL80211_IFTYPE_ADHOC:
619 case NL80211_IFTYPE_AP:
620 case NL80211_IFTYPE_MESH_POINT:
621 netif_carrier_off(dev);
622 break;
623 case NL80211_IFTYPE_WDS:
624 case NL80211_IFTYPE_P2P_DEVICE:
625 break;
626 default:
627 /* not reached */
628 WARN_ON(1);
629 }
630
631 /*
632 * set default queue parameters so drivers don't
633 * need to initialise the hardware if the hardware
634 * doesn't start up with sane defaults
635 */
636 ieee80211_set_wmm_default(sdata, true);
637 }
638
639 set_bit(SDATA_STATE_RUNNING, &sdata->state);
640
641 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
642 /* Create STA entry for the WDS peer */
643 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
644 GFP_KERNEL);
645 if (!sta) {
646 res = -ENOMEM;
647 goto err_del_interface;
648 }
649
650 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
651 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
652 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
653
654 res = sta_info_insert(sta);
655 if (res) {
656 /* STA has been freed */
657 goto err_del_interface;
658 }
659
660 rate_control_rate_init(sta);
661 netif_carrier_on(dev);
662 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
663 rcu_assign_pointer(local->p2p_sdata, sdata);
664 }
665
666 /*
667 * set_multicast_list will be invoked by the networking core
668 * which will check whether any increments here were done in
669 * error and sync them down to the hardware as filter flags.
670 */
671 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
672 atomic_inc(&local->iff_allmultis);
673
674 if (sdata->flags & IEEE80211_SDATA_PROMISC)
675 atomic_inc(&local->iff_promiscs);
676
677 if (coming_up)
678 local->open_count++;
679
680 if (hw_reconf_flags)
681 ieee80211_hw_config(local, hw_reconf_flags);
682
683 ieee80211_recalc_ps(local, -1);
684
685 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
687 /* XXX: for AP_VLAN, actually track AP queues */
688 netif_tx_start_all_queues(dev);
689 } else if (dev) {
690 unsigned long flags;
691 int n_acs = IEEE80211_NUM_ACS;
692 int ac;
693
694 if (local->hw.queues < IEEE80211_NUM_ACS)
695 n_acs = 1;
696
697 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
698 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
699 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
700 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
701 for (ac = 0; ac < n_acs; ac++) {
702 int ac_queue = sdata->vif.hw_queue[ac];
703
704 if (local->queue_stop_reasons[ac_queue] == 0 &&
705 skb_queue_empty(&local->pending[ac_queue]))
706 netif_start_subqueue(dev, ac);
707 }
708 }
709 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
710 }
711
712 return 0;
713 err_del_interface:
714 drv_remove_interface(local, sdata);
715 err_stop:
716 if (!local->open_count)
717 drv_stop(local);
718 err_del_bss:
719 sdata->bss = NULL;
720 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
721 list_del(&sdata->u.vlan.list);
722 /* might already be clear but that doesn't matter */
723 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
724 return res;
725 }
726
727 static int ieee80211_open(struct net_device *dev)
728 {
729 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
730 int err;
731
732 /* fail early if user set an invalid address */
733 if (!is_valid_ether_addr(dev->dev_addr))
734 return -EADDRNOTAVAIL;
735
736 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
737 if (err)
738 return err;
739
740 return ieee80211_do_open(&sdata->wdev, true);
741 }
742
743 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
744 bool going_down)
745 {
746 struct ieee80211_local *local = sdata->local;
747 unsigned long flags;
748 struct sk_buff *skb, *tmp;
749 u32 hw_reconf_flags = 0;
750 int i, flushed;
751 struct ps_data *ps;
752
753 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
754
755 if (rcu_access_pointer(local->scan_sdata) == sdata)
756 ieee80211_scan_cancel(local);
757
758 /*
759 * Stop TX on this interface first.
760 */
761 if (sdata->dev)
762 netif_tx_stop_all_queues(sdata->dev);
763
764 ieee80211_roc_purge(local, sdata);
765
766 if (sdata->vif.type == NL80211_IFTYPE_STATION)
767 ieee80211_mgd_stop(sdata);
768
769 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
770 ieee80211_ibss_stop(sdata);
771
772
773 /*
774 * Remove all stations associated with this interface.
775 *
776 * This must be done before calling ops->remove_interface()
777 * because otherwise we can later invoke ops->sta_notify()
778 * whenever the STAs are removed, and that invalidates driver
779 * assumptions about always getting a vif pointer that is valid
780 * (because if we remove a STA after ops->remove_interface()
781 * the driver will have removed the vif info already!)
782 *
783 * This is relevant only in WDS mode, in all other modes we've
784 * already removed all stations when disconnecting or similar,
785 * so warn otherwise.
786 *
787 * We call sta_info_flush_cleanup() later, to combine RCU waits.
788 */
789 flushed = sta_info_flush_defer(sdata);
790 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
791 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
792
793 /* don't count this interface for promisc/allmulti while it is down */
794 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
795 atomic_dec(&local->iff_allmultis);
796
797 if (sdata->flags & IEEE80211_SDATA_PROMISC)
798 atomic_dec(&local->iff_promiscs);
799
800 if (sdata->vif.type == NL80211_IFTYPE_AP) {
801 local->fif_pspoll--;
802 local->fif_probe_req--;
803 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
804 local->fif_probe_req--;
805 }
806
807 if (sdata->dev) {
808 netif_addr_lock_bh(sdata->dev);
809 spin_lock_bh(&local->filter_lock);
810 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
811 sdata->dev->addr_len);
812 spin_unlock_bh(&local->filter_lock);
813 netif_addr_unlock_bh(sdata->dev);
814 }
815
816 del_timer_sync(&local->dynamic_ps_timer);
817 cancel_work_sync(&local->dynamic_ps_enable_work);
818
819 cancel_work_sync(&sdata->recalc_smps);
820 sdata->vif.csa_active = false;
821 cancel_work_sync(&sdata->csa_finalize_work);
822
823 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
824
825 if (sdata->wdev.cac_started) {
826 WARN_ON(local->suspended);
827 mutex_lock(&local->iflist_mtx);
828 ieee80211_vif_release_channel(sdata);
829 mutex_unlock(&local->iflist_mtx);
830 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
831 GFP_KERNEL);
832 }
833
834 /* APs need special treatment */
835 if (sdata->vif.type == NL80211_IFTYPE_AP) {
836 struct ieee80211_sub_if_data *vlan, *tmpsdata;
837
838 /* down all dependent devices, that is VLANs */
839 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
840 u.vlan.list)
841 dev_close(vlan->dev);
842 WARN_ON(!list_empty(&sdata->u.ap.vlans));
843 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
844 /* remove all packets in parent bc_buf pointing to this dev */
845 ps = &sdata->bss->ps;
846
847 spin_lock_irqsave(&ps->bc_buf.lock, flags);
848 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
849 if (skb->dev == sdata->dev) {
850 __skb_unlink(skb, &ps->bc_buf);
851 local->total_ps_buffered--;
852 ieee80211_free_txskb(&local->hw, skb);
853 }
854 }
855 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
856 }
857
858 if (going_down)
859 local->open_count--;
860
861 switch (sdata->vif.type) {
862 case NL80211_IFTYPE_AP_VLAN:
863 list_del(&sdata->u.vlan.list);
864 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
865 /* no need to tell driver */
866 break;
867 case NL80211_IFTYPE_MONITOR:
868 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
869 local->cooked_mntrs--;
870 break;
871 }
872
873 local->monitors--;
874 if (local->monitors == 0) {
875 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
876 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
877 }
878
879 ieee80211_adjust_monitor_flags(sdata, -1);
880 break;
881 case NL80211_IFTYPE_P2P_DEVICE:
882 /* relies on synchronize_rcu() below */
883 rcu_assign_pointer(local->p2p_sdata, NULL);
884 /* fall through */
885 default:
886 cancel_work_sync(&sdata->work);
887 /*
888 * When we get here, the interface is marked down.
889 *
890 * sta_info_flush_cleanup() requires rcu_barrier()
891 * first to wait for the station call_rcu() calls
892 * to complete, and we also need synchronize_rcu()
893 * to wait for the RX path in case it is using the
894 * interface and enqueuing frames at this very time on
895 * another CPU.
896 */
897 synchronize_rcu();
898 rcu_barrier();
899 sta_info_flush_cleanup(sdata);
900
901 /*
902 * Free all remaining keys, there shouldn't be any,
903 * except maybe in WDS mode?
904 */
905 ieee80211_free_keys(sdata);
906
907 /* fall through */
908 case NL80211_IFTYPE_AP:
909 skb_queue_purge(&sdata->skb_queue);
910 }
911
912 sdata->bss = NULL;
913
914 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
915 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
916 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
917 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
918 if (info->control.vif == &sdata->vif) {
919 __skb_unlink(skb, &local->pending[i]);
920 ieee80211_free_txskb(&local->hw, skb);
921 }
922 }
923 }
924 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
925
926 if (local->open_count == 0)
927 ieee80211_clear_tx_pending(local);
928
929 /*
930 * If the interface goes down while suspended, presumably because
931 * the device was unplugged and that happens before our resume,
932 * then the driver is already unconfigured and the remainder of
933 * this function isn't needed.
934 * XXX: what about WoWLAN? If the device has software state, e.g.
935 * memory allocated, it might expect teardown commands from
936 * mac80211 here?
937 */
938 if (local->suspended) {
939 WARN_ON(local->wowlan);
940 WARN_ON(rtnl_dereference(local->monitor_sdata));
941 return;
942 }
943
944 switch (sdata->vif.type) {
945 case NL80211_IFTYPE_AP_VLAN:
946 break;
947 case NL80211_IFTYPE_MONITOR:
948 if (local->monitors == 0)
949 ieee80211_del_virtual_monitor(local);
950
951 mutex_lock(&local->mtx);
952 ieee80211_recalc_idle(local);
953 mutex_unlock(&local->mtx);
954
955 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
956 break;
957
958 /* fall through */
959 default:
960 if (going_down)
961 drv_remove_interface(local, sdata);
962 }
963
964 ieee80211_recalc_ps(local, -1);
965
966 if (local->open_count == 0) {
967 ieee80211_stop_device(local);
968
969 /* no reconfiguring after stop! */
970 return;
971 }
972
973 /* do after stop to avoid reconfiguring when we stop anyway */
974 ieee80211_configure_filter(local);
975 ieee80211_hw_config(local, hw_reconf_flags);
976
977 if (local->monitors == local->open_count)
978 ieee80211_add_virtual_monitor(local);
979 }
980
981 static int ieee80211_stop(struct net_device *dev)
982 {
983 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
984
985 ieee80211_do_stop(sdata, true);
986
987 return 0;
988 }
989
990 static void ieee80211_set_multicast_list(struct net_device *dev)
991 {
992 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
993 struct ieee80211_local *local = sdata->local;
994 int allmulti, promisc, sdata_allmulti, sdata_promisc;
995
996 allmulti = !!(dev->flags & IFF_ALLMULTI);
997 promisc = !!(dev->flags & IFF_PROMISC);
998 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
999 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
1000
1001 if (allmulti != sdata_allmulti) {
1002 if (dev->flags & IFF_ALLMULTI)
1003 atomic_inc(&local->iff_allmultis);
1004 else
1005 atomic_dec(&local->iff_allmultis);
1006 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1007 }
1008
1009 if (promisc != sdata_promisc) {
1010 if (dev->flags & IFF_PROMISC)
1011 atomic_inc(&local->iff_promiscs);
1012 else
1013 atomic_dec(&local->iff_promiscs);
1014 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1015 }
1016
1017 /*
1018 * TODO: If somebody needs this on AP interfaces,
1019 * it can be enabled easily but multicast
1020 * addresses from VLANs need to be synced.
1021 */
1022 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1023 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1024 sdata->vif.type != NL80211_IFTYPE_AP)
1025 drv_set_multicast_list(local, sdata, &dev->mc);
1026
1027 spin_lock_bh(&local->filter_lock);
1028 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1029 spin_unlock_bh(&local->filter_lock);
1030 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1031 }
1032
1033 /*
1034 * Called when the netdev is removed or, by the code below, before
1035 * the interface type changes.
1036 */
1037 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1038 {
1039 int flushed;
1040 int i;
1041
1042 /* free extra data */
1043 ieee80211_free_keys(sdata);
1044
1045 ieee80211_debugfs_remove_netdev(sdata);
1046
1047 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1048 __skb_queue_purge(&sdata->fragments[i].skb_list);
1049 sdata->fragment_next = 0;
1050
1051 if (ieee80211_vif_is_mesh(&sdata->vif))
1052 mesh_rmc_free(sdata);
1053
1054 flushed = sta_info_flush(sdata);
1055 WARN_ON(flushed);
1056 }
1057
1058 static void ieee80211_uninit(struct net_device *dev)
1059 {
1060 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1061 }
1062
1063 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1064 struct sk_buff *skb,
1065 void *accel_priv)
1066 {
1067 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1068 }
1069
1070 static const struct net_device_ops ieee80211_dataif_ops = {
1071 .ndo_open = ieee80211_open,
1072 .ndo_stop = ieee80211_stop,
1073 .ndo_uninit = ieee80211_uninit,
1074 .ndo_start_xmit = ieee80211_subif_start_xmit,
1075 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1076 .ndo_change_mtu = ieee80211_change_mtu,
1077 .ndo_set_mac_address = ieee80211_change_mac,
1078 .ndo_select_queue = ieee80211_netdev_select_queue,
1079 };
1080
1081 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1082 struct sk_buff *skb,
1083 void *accel_priv)
1084 {
1085 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1086 struct ieee80211_local *local = sdata->local;
1087 struct ieee80211_hdr *hdr;
1088 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1089
1090 if (local->hw.queues < IEEE80211_NUM_ACS)
1091 return 0;
1092
1093 if (skb->len < 4 ||
1094 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1095 return 0; /* doesn't matter, frame will be dropped */
1096
1097 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1098
1099 return ieee80211_select_queue_80211(sdata, skb, hdr);
1100 }
1101
1102 static const struct net_device_ops ieee80211_monitorif_ops = {
1103 .ndo_open = ieee80211_open,
1104 .ndo_stop = ieee80211_stop,
1105 .ndo_uninit = ieee80211_uninit,
1106 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1107 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1108 .ndo_change_mtu = ieee80211_change_mtu,
1109 .ndo_set_mac_address = ieee80211_change_mac,
1110 .ndo_select_queue = ieee80211_monitor_select_queue,
1111 };
1112
1113 static void ieee80211_if_setup(struct net_device *dev)
1114 {
1115 ether_setup(dev);
1116 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1117 dev->netdev_ops = &ieee80211_dataif_ops;
1118 dev->destructor = free_netdev;
1119 }
1120
1121 static void ieee80211_iface_work(struct work_struct *work)
1122 {
1123 struct ieee80211_sub_if_data *sdata =
1124 container_of(work, struct ieee80211_sub_if_data, work);
1125 struct ieee80211_local *local = sdata->local;
1126 struct sk_buff *skb;
1127 struct sta_info *sta;
1128 struct ieee80211_ra_tid *ra_tid;
1129
1130 if (!ieee80211_sdata_running(sdata))
1131 return;
1132
1133 if (local->scanning)
1134 return;
1135
1136 /*
1137 * ieee80211_queue_work() should have picked up most cases,
1138 * here we'll pick the rest.
1139 */
1140 if (WARN(local->suspended,
1141 "interface work scheduled while going to suspend\n"))
1142 return;
1143
1144 /* first process frames */
1145 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1146 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1147
1148 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1149 ra_tid = (void *)&skb->cb;
1150 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1151 ra_tid->tid);
1152 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1153 ra_tid = (void *)&skb->cb;
1154 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1155 ra_tid->tid);
1156 } else if (ieee80211_is_action(mgmt->frame_control) &&
1157 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1158 int len = skb->len;
1159
1160 mutex_lock(&local->sta_mtx);
1161 sta = sta_info_get_bss(sdata, mgmt->sa);
1162 if (sta) {
1163 switch (mgmt->u.action.u.addba_req.action_code) {
1164 case WLAN_ACTION_ADDBA_REQ:
1165 ieee80211_process_addba_request(
1166 local, sta, mgmt, len);
1167 break;
1168 case WLAN_ACTION_ADDBA_RESP:
1169 ieee80211_process_addba_resp(local, sta,
1170 mgmt, len);
1171 break;
1172 case WLAN_ACTION_DELBA:
1173 ieee80211_process_delba(sdata, sta,
1174 mgmt, len);
1175 break;
1176 default:
1177 WARN_ON(1);
1178 break;
1179 }
1180 }
1181 mutex_unlock(&local->sta_mtx);
1182 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1183 struct ieee80211_hdr *hdr = (void *)mgmt;
1184 /*
1185 * So the frame isn't mgmt, but frame_control
1186 * is at the right place anyway, of course, so
1187 * the if statement is correct.
1188 *
1189 * Warn if we have other data frame types here,
1190 * they must not get here.
1191 */
1192 WARN_ON(hdr->frame_control &
1193 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1194 WARN_ON(!(hdr->seq_ctrl &
1195 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1196 /*
1197 * This was a fragment of a frame, received while
1198 * a block-ack session was active. That cannot be
1199 * right, so terminate the session.
1200 */
1201 mutex_lock(&local->sta_mtx);
1202 sta = sta_info_get_bss(sdata, mgmt->sa);
1203 if (sta) {
1204 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1205 IEEE80211_QOS_CTL_TID_MASK;
1206
1207 __ieee80211_stop_rx_ba_session(
1208 sta, tid, WLAN_BACK_RECIPIENT,
1209 WLAN_REASON_QSTA_REQUIRE_SETUP,
1210 true);
1211 }
1212 mutex_unlock(&local->sta_mtx);
1213 } else switch (sdata->vif.type) {
1214 case NL80211_IFTYPE_STATION:
1215 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1216 break;
1217 case NL80211_IFTYPE_ADHOC:
1218 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1219 break;
1220 case NL80211_IFTYPE_MESH_POINT:
1221 if (!ieee80211_vif_is_mesh(&sdata->vif))
1222 break;
1223 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1224 break;
1225 default:
1226 WARN(1, "frame for unexpected interface type");
1227 break;
1228 }
1229
1230 kfree_skb(skb);
1231 }
1232
1233 /* then other type-dependent work */
1234 switch (sdata->vif.type) {
1235 case NL80211_IFTYPE_STATION:
1236 ieee80211_sta_work(sdata);
1237 break;
1238 case NL80211_IFTYPE_ADHOC:
1239 ieee80211_ibss_work(sdata);
1240 break;
1241 case NL80211_IFTYPE_MESH_POINT:
1242 if (!ieee80211_vif_is_mesh(&sdata->vif))
1243 break;
1244 ieee80211_mesh_work(sdata);
1245 break;
1246 default:
1247 break;
1248 }
1249 }
1250
1251 static void ieee80211_recalc_smps_work(struct work_struct *work)
1252 {
1253 struct ieee80211_sub_if_data *sdata =
1254 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1255
1256 ieee80211_recalc_smps(sdata);
1257 }
1258
1259 /*
1260 * Helper function to initialise an interface to a specific type.
1261 */
1262 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1263 enum nl80211_iftype type)
1264 {
1265 /* clear type-dependent union */
1266 memset(&sdata->u, 0, sizeof(sdata->u));
1267
1268 /* and set some type-dependent values */
1269 sdata->vif.type = type;
1270 sdata->vif.p2p = false;
1271 sdata->wdev.iftype = type;
1272
1273 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1274 sdata->control_port_no_encrypt = false;
1275
1276 sdata->noack_map = 0;
1277
1278 /* only monitor/p2p-device differ */
1279 if (sdata->dev) {
1280 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1281 sdata->dev->type = ARPHRD_ETHER;
1282 }
1283
1284 skb_queue_head_init(&sdata->skb_queue);
1285 INIT_WORK(&sdata->work, ieee80211_iface_work);
1286 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1287 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1288
1289 switch (type) {
1290 case NL80211_IFTYPE_P2P_GO:
1291 type = NL80211_IFTYPE_AP;
1292 sdata->vif.type = type;
1293 sdata->vif.p2p = true;
1294 /* fall through */
1295 case NL80211_IFTYPE_AP:
1296 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1297 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1298 INIT_WORK(&sdata->u.ap.request_smps_work,
1299 ieee80211_request_smps_ap_work);
1300 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1301 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1302 break;
1303 case NL80211_IFTYPE_P2P_CLIENT:
1304 type = NL80211_IFTYPE_STATION;
1305 sdata->vif.type = type;
1306 sdata->vif.p2p = true;
1307 /* fall through */
1308 case NL80211_IFTYPE_STATION:
1309 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1310 ieee80211_sta_setup_sdata(sdata);
1311 break;
1312 case NL80211_IFTYPE_ADHOC:
1313 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1314 ieee80211_ibss_setup_sdata(sdata);
1315 break;
1316 case NL80211_IFTYPE_MESH_POINT:
1317 if (ieee80211_vif_is_mesh(&sdata->vif))
1318 ieee80211_mesh_init_sdata(sdata);
1319 break;
1320 case NL80211_IFTYPE_MONITOR:
1321 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1322 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1323 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1324 MONITOR_FLAG_OTHER_BSS;
1325 break;
1326 case NL80211_IFTYPE_WDS:
1327 sdata->vif.bss_conf.bssid = NULL;
1328 break;
1329 case NL80211_IFTYPE_AP_VLAN:
1330 case NL80211_IFTYPE_P2P_DEVICE:
1331 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1332 break;
1333 case NL80211_IFTYPE_UNSPECIFIED:
1334 case NUM_NL80211_IFTYPES:
1335 BUG();
1336 break;
1337 }
1338
1339 ieee80211_debugfs_add_netdev(sdata);
1340 }
1341
1342 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1343 enum nl80211_iftype type)
1344 {
1345 struct ieee80211_local *local = sdata->local;
1346 int ret, err;
1347 enum nl80211_iftype internal_type = type;
1348 bool p2p = false;
1349
1350 ASSERT_RTNL();
1351
1352 if (!local->ops->change_interface)
1353 return -EBUSY;
1354
1355 switch (sdata->vif.type) {
1356 case NL80211_IFTYPE_AP:
1357 case NL80211_IFTYPE_STATION:
1358 case NL80211_IFTYPE_ADHOC:
1359 /*
1360 * Could maybe also all others here?
1361 * Just not sure how that interacts
1362 * with the RX/config path e.g. for
1363 * mesh.
1364 */
1365 break;
1366 default:
1367 return -EBUSY;
1368 }
1369
1370 switch (type) {
1371 case NL80211_IFTYPE_AP:
1372 case NL80211_IFTYPE_STATION:
1373 case NL80211_IFTYPE_ADHOC:
1374 /*
1375 * Could probably support everything
1376 * but WDS here (WDS do_open can fail
1377 * under memory pressure, which this
1378 * code isn't prepared to handle).
1379 */
1380 break;
1381 case NL80211_IFTYPE_P2P_CLIENT:
1382 p2p = true;
1383 internal_type = NL80211_IFTYPE_STATION;
1384 break;
1385 case NL80211_IFTYPE_P2P_GO:
1386 p2p = true;
1387 internal_type = NL80211_IFTYPE_AP;
1388 break;
1389 default:
1390 return -EBUSY;
1391 }
1392
1393 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1394 if (ret)
1395 return ret;
1396
1397 ieee80211_do_stop(sdata, false);
1398
1399 ieee80211_teardown_sdata(sdata);
1400
1401 ret = drv_change_interface(local, sdata, internal_type, p2p);
1402 if (ret)
1403 type = ieee80211_vif_type_p2p(&sdata->vif);
1404
1405 /*
1406 * Ignore return value here, there's not much we can do since
1407 * the driver changed the interface type internally already.
1408 * The warnings will hopefully make driver authors fix it :-)
1409 */
1410 ieee80211_check_queues(sdata, type);
1411
1412 ieee80211_setup_sdata(sdata, type);
1413
1414 err = ieee80211_do_open(&sdata->wdev, false);
1415 WARN(err, "type change: do_open returned %d", err);
1416
1417 return ret;
1418 }
1419
1420 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1421 enum nl80211_iftype type)
1422 {
1423 int ret;
1424
1425 ASSERT_RTNL();
1426
1427 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1428 return 0;
1429
1430 if (ieee80211_sdata_running(sdata)) {
1431 ret = ieee80211_runtime_change_iftype(sdata, type);
1432 if (ret)
1433 return ret;
1434 } else {
1435 /* Purge and reset type-dependent state. */
1436 ieee80211_teardown_sdata(sdata);
1437 ieee80211_setup_sdata(sdata, type);
1438 }
1439
1440 /* reset some values that shouldn't be kept across type changes */
1441 sdata->drop_unencrypted = 0;
1442 if (type == NL80211_IFTYPE_STATION)
1443 sdata->u.mgd.use_4addr = false;
1444
1445 return 0;
1446 }
1447
1448 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1449 u8 *perm_addr, enum nl80211_iftype type)
1450 {
1451 struct ieee80211_sub_if_data *sdata;
1452 u64 mask, start, addr, val, inc;
1453 u8 *m;
1454 u8 tmp_addr[ETH_ALEN];
1455 int i;
1456
1457 /* default ... something at least */
1458 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1459
1460 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1461 local->hw.wiphy->n_addresses <= 1)
1462 return;
1463
1464 mutex_lock(&local->iflist_mtx);
1465
1466 switch (type) {
1467 case NL80211_IFTYPE_MONITOR:
1468 /* doesn't matter */
1469 break;
1470 case NL80211_IFTYPE_WDS:
1471 case NL80211_IFTYPE_AP_VLAN:
1472 /* match up with an AP interface */
1473 list_for_each_entry(sdata, &local->interfaces, list) {
1474 if (sdata->vif.type != NL80211_IFTYPE_AP)
1475 continue;
1476 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1477 break;
1478 }
1479 /* keep default if no AP interface present */
1480 break;
1481 case NL80211_IFTYPE_P2P_CLIENT:
1482 case NL80211_IFTYPE_P2P_GO:
1483 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1484 list_for_each_entry(sdata, &local->interfaces, list) {
1485 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1486 continue;
1487 if (!ieee80211_sdata_running(sdata))
1488 continue;
1489 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1490 goto out_unlock;
1491 }
1492 }
1493 /* otherwise fall through */
1494 default:
1495 /* assign a new address if possible -- try n_addresses first */
1496 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1497 bool used = false;
1498
1499 list_for_each_entry(sdata, &local->interfaces, list) {
1500 if (memcmp(local->hw.wiphy->addresses[i].addr,
1501 sdata->vif.addr, ETH_ALEN) == 0) {
1502 used = true;
1503 break;
1504 }
1505 }
1506
1507 if (!used) {
1508 memcpy(perm_addr,
1509 local->hw.wiphy->addresses[i].addr,
1510 ETH_ALEN);
1511 break;
1512 }
1513 }
1514
1515 /* try mask if available */
1516 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1517 break;
1518
1519 m = local->hw.wiphy->addr_mask;
1520 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1521 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1522 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1523
1524 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1525 /* not a contiguous mask ... not handled now! */
1526 pr_info("not contiguous\n");
1527 break;
1528 }
1529
1530 /*
1531 * Pick address of existing interface in case user changed
1532 * MAC address manually, default to perm_addr.
1533 */
1534 m = local->hw.wiphy->perm_addr;
1535 list_for_each_entry(sdata, &local->interfaces, list) {
1536 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1537 continue;
1538 m = sdata->vif.addr;
1539 break;
1540 }
1541 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1542 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1543 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1544
1545 inc = 1ULL<<__ffs64(mask);
1546 val = (start & mask);
1547 addr = (start & ~mask) | (val & mask);
1548 do {
1549 bool used = false;
1550
1551 tmp_addr[5] = addr >> 0*8;
1552 tmp_addr[4] = addr >> 1*8;
1553 tmp_addr[3] = addr >> 2*8;
1554 tmp_addr[2] = addr >> 3*8;
1555 tmp_addr[1] = addr >> 4*8;
1556 tmp_addr[0] = addr >> 5*8;
1557
1558 val += inc;
1559
1560 list_for_each_entry(sdata, &local->interfaces, list) {
1561 if (memcmp(tmp_addr, sdata->vif.addr,
1562 ETH_ALEN) == 0) {
1563 used = true;
1564 break;
1565 }
1566 }
1567
1568 if (!used) {
1569 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1570 break;
1571 }
1572 addr = (start & ~mask) | (val & mask);
1573 } while (addr != start);
1574
1575 break;
1576 }
1577
1578 out_unlock:
1579 mutex_unlock(&local->iflist_mtx);
1580 }
1581
1582 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1583 {
1584 struct ieee80211_sub_if_data *sdata;
1585
1586 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1587
1588 ieee80211_cleanup_sdata_stas(sdata);
1589 }
1590
1591 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1592 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1593 struct vif_params *params)
1594 {
1595 struct net_device *ndev = NULL;
1596 struct ieee80211_sub_if_data *sdata = NULL;
1597 int ret, i;
1598 int txqs = 1;
1599
1600 ASSERT_RTNL();
1601
1602 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1603 struct wireless_dev *wdev;
1604
1605 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1606 GFP_KERNEL);
1607 if (!sdata)
1608 return -ENOMEM;
1609 wdev = &sdata->wdev;
1610
1611 sdata->dev = NULL;
1612 strlcpy(sdata->name, name, IFNAMSIZ);
1613 ieee80211_assign_perm_addr(local, wdev->address, type);
1614 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1615 } else {
1616 if (local->hw.queues >= IEEE80211_NUM_ACS)
1617 txqs = IEEE80211_NUM_ACS;
1618
1619 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1620 local->hw.vif_data_size,
1621 name, ieee80211_if_setup, txqs, 1);
1622 if (!ndev)
1623 return -ENOMEM;
1624 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1625
1626 ndev->needed_headroom = local->tx_headroom +
1627 4*6 /* four MAC addresses */
1628 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1629 + 6 /* mesh */
1630 + 8 /* rfc1042/bridge tunnel */
1631 - ETH_HLEN /* ethernet hard_header_len */
1632 + IEEE80211_ENCRYPT_HEADROOM;
1633 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1634
1635 ret = dev_alloc_name(ndev, ndev->name);
1636 if (ret < 0) {
1637 free_netdev(ndev);
1638 return ret;
1639 }
1640
1641 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1642 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1643 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1644
1645 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1646 sdata = netdev_priv(ndev);
1647 ndev->ieee80211_ptr = &sdata->wdev;
1648 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1649 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1650
1651 sdata->dev = ndev;
1652 }
1653
1654 /* initialise type-independent data */
1655 sdata->wdev.wiphy = local->hw.wiphy;
1656 sdata->local = local;
1657
1658 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1659 skb_queue_head_init(&sdata->fragments[i].skb_list);
1660
1661 INIT_LIST_HEAD(&sdata->key_list);
1662
1663 spin_lock_init(&sdata->cleanup_stations_lock);
1664 INIT_LIST_HEAD(&sdata->cleanup_stations);
1665 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1666 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1667 ieee80211_dfs_cac_timer_work);
1668 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1669 ieee80211_delayed_tailroom_dec);
1670
1671 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1672 struct ieee80211_supported_band *sband;
1673 sband = local->hw.wiphy->bands[i];
1674 sdata->rc_rateidx_mask[i] =
1675 sband ? (1 << sband->n_bitrates) - 1 : 0;
1676 if (sband)
1677 memcpy(sdata->rc_rateidx_mcs_mask[i],
1678 sband->ht_cap.mcs.rx_mask,
1679 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1680 else
1681 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1682 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1683 }
1684
1685 ieee80211_set_default_queues(sdata);
1686
1687 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1688 sdata->user_power_level = local->user_power_level;
1689
1690 /* setup type-dependent data */
1691 ieee80211_setup_sdata(sdata, type);
1692
1693 if (ndev) {
1694 if (params) {
1695 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1696 if (type == NL80211_IFTYPE_STATION)
1697 sdata->u.mgd.use_4addr = params->use_4addr;
1698 }
1699
1700 ndev->features |= local->hw.netdev_features;
1701
1702 ret = register_netdevice(ndev);
1703 if (ret) {
1704 free_netdev(ndev);
1705 return ret;
1706 }
1707 }
1708
1709 mutex_lock(&local->iflist_mtx);
1710 list_add_tail_rcu(&sdata->list, &local->interfaces);
1711 mutex_unlock(&local->iflist_mtx);
1712
1713 if (new_wdev)
1714 *new_wdev = &sdata->wdev;
1715
1716 return 0;
1717 }
1718
1719 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1720 {
1721 ASSERT_RTNL();
1722
1723 mutex_lock(&sdata->local->iflist_mtx);
1724 list_del_rcu(&sdata->list);
1725 mutex_unlock(&sdata->local->iflist_mtx);
1726
1727 synchronize_rcu();
1728
1729 if (sdata->dev) {
1730 unregister_netdevice(sdata->dev);
1731 } else {
1732 cfg80211_unregister_wdev(&sdata->wdev);
1733 kfree(sdata);
1734 }
1735 }
1736
1737 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1738 {
1739 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1740 return;
1741 ieee80211_do_stop(sdata, true);
1742 ieee80211_teardown_sdata(sdata);
1743 }
1744
1745 /*
1746 * Remove all interfaces, may only be called at hardware unregistration
1747 * time because it doesn't do RCU-safe list removals.
1748 */
1749 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1750 {
1751 struct ieee80211_sub_if_data *sdata, *tmp;
1752 LIST_HEAD(unreg_list);
1753 LIST_HEAD(wdev_list);
1754
1755 ASSERT_RTNL();
1756
1757 /*
1758 * Close all AP_VLAN interfaces first, as otherwise they
1759 * might be closed while the AP interface they belong to
1760 * is closed, causing unregister_netdevice_many() to crash.
1761 */
1762 list_for_each_entry(sdata, &local->interfaces, list)
1763 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1764 dev_close(sdata->dev);
1765
1766 mutex_lock(&local->iflist_mtx);
1767 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1768 list_del(&sdata->list);
1769
1770 if (sdata->dev)
1771 unregister_netdevice_queue(sdata->dev, &unreg_list);
1772 else
1773 list_add(&sdata->list, &wdev_list);
1774 }
1775 mutex_unlock(&local->iflist_mtx);
1776 unregister_netdevice_many(&unreg_list);
1777 list_del(&unreg_list);
1778
1779 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1780 list_del(&sdata->list);
1781 cfg80211_unregister_wdev(&sdata->wdev);
1782 kfree(sdata);
1783 }
1784 }
1785
1786 static int netdev_notify(struct notifier_block *nb,
1787 unsigned long state, void *ptr)
1788 {
1789 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1790 struct ieee80211_sub_if_data *sdata;
1791
1792 if (state != NETDEV_CHANGENAME)
1793 return 0;
1794
1795 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1796 return 0;
1797
1798 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1799 return 0;
1800
1801 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1802
1803 memcpy(sdata->name, dev->name, IFNAMSIZ);
1804
1805 ieee80211_debugfs_rename_netdev(sdata);
1806 return 0;
1807 }
1808
1809 static struct notifier_block mac80211_netdev_notifier = {
1810 .notifier_call = netdev_notify,
1811 };
1812
1813 int ieee80211_iface_init(void)
1814 {
1815 return register_netdevice_notifier(&mac80211_netdev_notifier);
1816 }
1817
1818 void ieee80211_iface_exit(void)
1819 {
1820 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1821 }
Linux kernel - Deliverables
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