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ARM: at91: fix board-rm9200-dt after sys_timer conversion
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / mac80211 / iface.c
1 /*
2 * Interface handling (except master interface)
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 = chanctx_conf->def.chan->max_power;
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 const char *reason)
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 drv_flush(local, false);
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 {
104 struct ieee80211_sub_if_data *sdata;
105 int count = 0;
106 bool working = false, scanning = false;
107 unsigned int led_trig_start = 0, led_trig_stop = 0;
108 struct ieee80211_roc_work *roc;
109
110 #ifdef CONFIG_PROVE_LOCKING
111 WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
112 !lockdep_is_held(&local->iflist_mtx));
113 #endif
114 lockdep_assert_held(&local->mtx);
115
116 list_for_each_entry(sdata, &local->interfaces, list) {
117 if (!ieee80211_sdata_running(sdata)) {
118 sdata->vif.bss_conf.idle = true;
119 continue;
120 }
121
122 sdata->old_idle = sdata->vif.bss_conf.idle;
123
124 /* do not count disabled managed interfaces */
125 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
126 !sdata->u.mgd.associated &&
127 !sdata->u.mgd.auth_data &&
128 !sdata->u.mgd.assoc_data) {
129 sdata->vif.bss_conf.idle = true;
130 continue;
131 }
132 /* do not count unused IBSS interfaces */
133 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
134 !sdata->u.ibss.ssid_len) {
135 sdata->vif.bss_conf.idle = true;
136 continue;
137 }
138
139 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
140 continue;
141
142 /* count everything else */
143 sdata->vif.bss_conf.idle = false;
144 count++;
145 }
146
147 if (!local->ops->remain_on_channel) {
148 list_for_each_entry(roc, &local->roc_list, list) {
149 working = true;
150 roc->sdata->vif.bss_conf.idle = false;
151 }
152 }
153
154 sdata = rcu_dereference_protected(local->scan_sdata,
155 lockdep_is_held(&local->mtx));
156 if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
157 scanning = true;
158 sdata->vif.bss_conf.idle = false;
159 }
160
161 list_for_each_entry(sdata, &local->interfaces, list) {
162 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
163 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
164 sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
165 continue;
166 if (sdata->old_idle == sdata->vif.bss_conf.idle)
167 continue;
168 if (!ieee80211_sdata_running(sdata))
169 continue;
170 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
171 }
172
173 if (working || scanning)
174 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
175 else
176 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
177
178 if (count)
179 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
180 else
181 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
182
183 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
184
185 if (working)
186 return ieee80211_idle_off(local, "working");
187 if (scanning)
188 return ieee80211_idle_off(local, "scanning");
189 if (!count)
190 return ieee80211_idle_on(local);
191 else
192 return ieee80211_idle_off(local, "in use");
193
194 return 0;
195 }
196
197 void ieee80211_recalc_idle(struct ieee80211_local *local)
198 {
199 u32 chg;
200
201 mutex_lock(&local->iflist_mtx);
202 chg = __ieee80211_recalc_idle(local);
203 mutex_unlock(&local->iflist_mtx);
204 if (chg)
205 ieee80211_hw_config(local, chg);
206 }
207
208 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
209 {
210 int meshhdrlen;
211 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
212
213 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
214
215 /* FIX: what would be proper limits for MTU?
216 * This interface uses 802.3 frames. */
217 if (new_mtu < 256 ||
218 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
219 return -EINVAL;
220 }
221
222 dev->mtu = new_mtu;
223 return 0;
224 }
225
226 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
227 {
228 struct ieee80211_sub_if_data *sdata;
229 u64 new, mask, tmp;
230 u8 *m;
231 int ret = 0;
232
233 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
234 return 0;
235
236 m = addr;
237 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
238 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
239 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
240
241 m = local->hw.wiphy->addr_mask;
242 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
243 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
244 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
245
246
247 mutex_lock(&local->iflist_mtx);
248 list_for_each_entry(sdata, &local->interfaces, list) {
249 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
250 continue;
251
252 m = sdata->vif.addr;
253 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
254 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
255 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
256
257 if ((new & ~mask) != (tmp & ~mask)) {
258 ret = -EINVAL;
259 break;
260 }
261 }
262 mutex_unlock(&local->iflist_mtx);
263
264 return ret;
265 }
266
267 static int ieee80211_change_mac(struct net_device *dev, void *addr)
268 {
269 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
270 struct sockaddr *sa = addr;
271 int ret;
272
273 if (ieee80211_sdata_running(sdata))
274 return -EBUSY;
275
276 ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
277 if (ret)
278 return ret;
279
280 ret = eth_mac_addr(dev, sa);
281
282 if (ret == 0)
283 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
284
285 return ret;
286 }
287
288 static inline int identical_mac_addr_allowed(int type1, int type2)
289 {
290 return type1 == NL80211_IFTYPE_MONITOR ||
291 type2 == NL80211_IFTYPE_MONITOR ||
292 type1 == NL80211_IFTYPE_P2P_DEVICE ||
293 type2 == NL80211_IFTYPE_P2P_DEVICE ||
294 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
295 (type1 == NL80211_IFTYPE_WDS &&
296 (type2 == NL80211_IFTYPE_WDS ||
297 type2 == NL80211_IFTYPE_AP)) ||
298 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
299 (type1 == NL80211_IFTYPE_AP_VLAN &&
300 (type2 == NL80211_IFTYPE_AP ||
301 type2 == NL80211_IFTYPE_AP_VLAN));
302 }
303
304 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
305 enum nl80211_iftype iftype)
306 {
307 struct ieee80211_local *local = sdata->local;
308 struct ieee80211_sub_if_data *nsdata;
309
310 ASSERT_RTNL();
311
312 /* we hold the RTNL here so can safely walk the list */
313 list_for_each_entry(nsdata, &local->interfaces, list) {
314 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
315 /*
316 * Allow only a single IBSS interface to be up at any
317 * time. This is restricted because beacon distribution
318 * cannot work properly if both are in the same IBSS.
319 *
320 * To remove this restriction we'd have to disallow them
321 * from setting the same SSID on different IBSS interfaces
322 * belonging to the same hardware. Then, however, we're
323 * faced with having to adopt two different TSF timers...
324 */
325 if (iftype == NL80211_IFTYPE_ADHOC &&
326 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
327 return -EBUSY;
328
329 /*
330 * The remaining checks are only performed for interfaces
331 * with the same MAC address.
332 */
333 if (!ether_addr_equal(sdata->vif.addr,
334 nsdata->vif.addr))
335 continue;
336
337 /*
338 * check whether it may have the same address
339 */
340 if (!identical_mac_addr_allowed(iftype,
341 nsdata->vif.type))
342 return -ENOTUNIQ;
343
344 /*
345 * can only add VLANs to enabled APs
346 */
347 if (iftype == NL80211_IFTYPE_AP_VLAN &&
348 nsdata->vif.type == NL80211_IFTYPE_AP)
349 sdata->bss = &nsdata->u.ap;
350 }
351 }
352
353 return 0;
354 }
355
356 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
357 {
358 int n_queues = sdata->local->hw.queues;
359 int i;
360
361 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
362 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
363 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
364 IEEE80211_INVAL_HW_QUEUE))
365 return -EINVAL;
366 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
367 n_queues))
368 return -EINVAL;
369 }
370 }
371
372 if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
373 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
374 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
375 return 0;
376 }
377
378 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
379 return -EINVAL;
380
381 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
382 return -EINVAL;
383
384 return 0;
385 }
386
387 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
388 const int offset)
389 {
390 struct ieee80211_local *local = sdata->local;
391 u32 flags = sdata->u.mntr_flags;
392
393 #define ADJUST(_f, _s) do { \
394 if (flags & MONITOR_FLAG_##_f) \
395 local->fif_##_s += offset; \
396 } while (0)
397
398 ADJUST(FCSFAIL, fcsfail);
399 ADJUST(PLCPFAIL, plcpfail);
400 ADJUST(CONTROL, control);
401 ADJUST(CONTROL, pspoll);
402 ADJUST(OTHER_BSS, other_bss);
403
404 #undef ADJUST
405 }
406
407 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
408 {
409 struct ieee80211_local *local = sdata->local;
410 int i;
411
412 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
413 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
414 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
415 else if (local->hw.queues >= IEEE80211_NUM_ACS)
416 sdata->vif.hw_queue[i] = i;
417 else
418 sdata->vif.hw_queue[i] = 0;
419 }
420 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
421 }
422
423 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
424 {
425 struct ieee80211_sub_if_data *sdata;
426 int ret = 0;
427
428 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
429 return 0;
430
431 mutex_lock(&local->iflist_mtx);
432
433 if (local->monitor_sdata)
434 goto out_unlock;
435
436 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
437 if (!sdata) {
438 ret = -ENOMEM;
439 goto out_unlock;
440 }
441
442 /* set up data */
443 sdata->local = local;
444 sdata->vif.type = NL80211_IFTYPE_MONITOR;
445 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
446 wiphy_name(local->hw.wiphy));
447
448 ieee80211_set_default_queues(sdata);
449
450 ret = drv_add_interface(local, sdata);
451 if (WARN_ON(ret)) {
452 /* ok .. stupid driver, it asked for this! */
453 kfree(sdata);
454 goto out_unlock;
455 }
456
457 ret = ieee80211_check_queues(sdata);
458 if (ret) {
459 kfree(sdata);
460 goto out_unlock;
461 }
462
463 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
464 IEEE80211_CHANCTX_EXCLUSIVE);
465 if (ret) {
466 drv_remove_interface(local, sdata);
467 kfree(sdata);
468 goto out_unlock;
469 }
470
471 rcu_assign_pointer(local->monitor_sdata, sdata);
472 out_unlock:
473 mutex_unlock(&local->iflist_mtx);
474 return ret;
475 }
476
477 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
478 {
479 struct ieee80211_sub_if_data *sdata;
480
481 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
482 return;
483
484 mutex_lock(&local->iflist_mtx);
485
486 sdata = rcu_dereference_protected(local->monitor_sdata,
487 lockdep_is_held(&local->iflist_mtx));
488 if (!sdata)
489 goto out_unlock;
490
491 rcu_assign_pointer(local->monitor_sdata, NULL);
492 synchronize_net();
493
494 ieee80211_vif_release_channel(sdata);
495
496 drv_remove_interface(local, sdata);
497
498 kfree(sdata);
499 out_unlock:
500 mutex_unlock(&local->iflist_mtx);
501 }
502
503 /*
504 * NOTE: Be very careful when changing this function, it must NOT return
505 * an error on interface type changes that have been pre-checked, so most
506 * checks should be in ieee80211_check_concurrent_iface.
507 */
508 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
509 {
510 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
511 struct net_device *dev = wdev->netdev;
512 struct ieee80211_local *local = sdata->local;
513 struct sta_info *sta;
514 u32 changed = 0;
515 int res;
516 u32 hw_reconf_flags = 0;
517
518 switch (sdata->vif.type) {
519 case NL80211_IFTYPE_WDS:
520 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
521 return -ENOLINK;
522 break;
523 case NL80211_IFTYPE_AP_VLAN: {
524 struct ieee80211_sub_if_data *master;
525
526 if (!sdata->bss)
527 return -ENOLINK;
528
529 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
530
531 master = container_of(sdata->bss,
532 struct ieee80211_sub_if_data, u.ap);
533 sdata->control_port_protocol =
534 master->control_port_protocol;
535 sdata->control_port_no_encrypt =
536 master->control_port_no_encrypt;
537 break;
538 }
539 case NL80211_IFTYPE_AP:
540 sdata->bss = &sdata->u.ap;
541 break;
542 case NL80211_IFTYPE_MESH_POINT:
543 case NL80211_IFTYPE_STATION:
544 case NL80211_IFTYPE_MONITOR:
545 case NL80211_IFTYPE_ADHOC:
546 case NL80211_IFTYPE_P2P_DEVICE:
547 /* no special treatment */
548 break;
549 case NL80211_IFTYPE_UNSPECIFIED:
550 case NUM_NL80211_IFTYPES:
551 case NL80211_IFTYPE_P2P_CLIENT:
552 case NL80211_IFTYPE_P2P_GO:
553 /* cannot happen */
554 WARN_ON(1);
555 break;
556 }
557
558 if (local->open_count == 0) {
559 res = drv_start(local);
560 if (res)
561 goto err_del_bss;
562 if (local->ops->napi_poll)
563 napi_enable(&local->napi);
564 /* we're brought up, everything changes */
565 hw_reconf_flags = ~0;
566 ieee80211_led_radio(local, true);
567 ieee80211_mod_tpt_led_trig(local,
568 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
569 }
570
571 /*
572 * Copy the hopefully now-present MAC address to
573 * this interface, if it has the special null one.
574 */
575 if (dev && is_zero_ether_addr(dev->dev_addr)) {
576 memcpy(dev->dev_addr,
577 local->hw.wiphy->perm_addr,
578 ETH_ALEN);
579 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
580
581 if (!is_valid_ether_addr(dev->dev_addr)) {
582 res = -EADDRNOTAVAIL;
583 goto err_stop;
584 }
585 }
586
587 switch (sdata->vif.type) {
588 case NL80211_IFTYPE_AP_VLAN:
589 /* no need to tell driver, but set carrier */
590 if (rtnl_dereference(sdata->bss->beacon))
591 netif_carrier_on(dev);
592 else
593 netif_carrier_off(dev);
594 break;
595 case NL80211_IFTYPE_MONITOR:
596 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
597 local->cooked_mntrs++;
598 break;
599 }
600
601 if (local->monitors == 0 && local->open_count == 0) {
602 res = ieee80211_add_virtual_monitor(local);
603 if (res)
604 goto err_stop;
605 }
606
607 /* must be before the call to ieee80211_configure_filter */
608 local->monitors++;
609 if (local->monitors == 1) {
610 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
611 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
612 }
613
614 ieee80211_adjust_monitor_flags(sdata, 1);
615 ieee80211_configure_filter(local);
616
617 netif_carrier_on(dev);
618 break;
619 default:
620 if (coming_up) {
621 ieee80211_del_virtual_monitor(local);
622
623 res = drv_add_interface(local, sdata);
624 if (res)
625 goto err_stop;
626 res = ieee80211_check_queues(sdata);
627 if (res)
628 goto err_del_interface;
629 }
630
631 if (sdata->vif.type == NL80211_IFTYPE_AP) {
632 local->fif_pspoll++;
633 local->fif_probe_req++;
634
635 ieee80211_configure_filter(local);
636 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
637 local->fif_probe_req++;
638 }
639
640 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
641 changed |= ieee80211_reset_erp_info(sdata);
642 ieee80211_bss_info_change_notify(sdata, changed);
643
644 switch (sdata->vif.type) {
645 case NL80211_IFTYPE_STATION:
646 case NL80211_IFTYPE_ADHOC:
647 case NL80211_IFTYPE_AP:
648 case NL80211_IFTYPE_MESH_POINT:
649 netif_carrier_off(dev);
650 break;
651 case NL80211_IFTYPE_WDS:
652 case NL80211_IFTYPE_P2P_DEVICE:
653 break;
654 default:
655 netif_carrier_on(dev);
656 }
657
658 /*
659 * set default queue parameters so drivers don't
660 * need to initialise the hardware if the hardware
661 * doesn't start up with sane defaults
662 */
663 ieee80211_set_wmm_default(sdata, true);
664 }
665
666 set_bit(SDATA_STATE_RUNNING, &sdata->state);
667
668 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
669 /* Create STA entry for the WDS peer */
670 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
671 GFP_KERNEL);
672 if (!sta) {
673 res = -ENOMEM;
674 goto err_del_interface;
675 }
676
677 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
678 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
679 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
680
681 res = sta_info_insert(sta);
682 if (res) {
683 /* STA has been freed */
684 goto err_del_interface;
685 }
686
687 rate_control_rate_init(sta);
688 netif_carrier_on(dev);
689 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
690 rcu_assign_pointer(local->p2p_sdata, sdata);
691 }
692
693 /*
694 * set_multicast_list will be invoked by the networking core
695 * which will check whether any increments here were done in
696 * error and sync them down to the hardware as filter flags.
697 */
698 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
699 atomic_inc(&local->iff_allmultis);
700
701 if (sdata->flags & IEEE80211_SDATA_PROMISC)
702 atomic_inc(&local->iff_promiscs);
703
704 mutex_lock(&local->mtx);
705 hw_reconf_flags |= __ieee80211_recalc_idle(local);
706 mutex_unlock(&local->mtx);
707
708 if (coming_up)
709 local->open_count++;
710
711 if (hw_reconf_flags)
712 ieee80211_hw_config(local, hw_reconf_flags);
713
714 ieee80211_recalc_ps(local, -1);
715
716 if (dev)
717 netif_tx_start_all_queues(dev);
718
719 return 0;
720 err_del_interface:
721 drv_remove_interface(local, sdata);
722 err_stop:
723 if (!local->open_count)
724 drv_stop(local);
725 err_del_bss:
726 sdata->bss = NULL;
727 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
728 list_del(&sdata->u.vlan.list);
729 /* might already be clear but that doesn't matter */
730 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
731 return res;
732 }
733
734 static int ieee80211_open(struct net_device *dev)
735 {
736 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
737 int err;
738
739 /* fail early if user set an invalid address */
740 if (!is_valid_ether_addr(dev->dev_addr))
741 return -EADDRNOTAVAIL;
742
743 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
744 if (err)
745 return err;
746
747 return ieee80211_do_open(&sdata->wdev, true);
748 }
749
750 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
751 bool going_down)
752 {
753 struct ieee80211_local *local = sdata->local;
754 unsigned long flags;
755 struct sk_buff *skb, *tmp;
756 u32 hw_reconf_flags = 0;
757 int i;
758
759 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
760
761 if (rcu_access_pointer(local->scan_sdata) == sdata)
762 ieee80211_scan_cancel(local);
763
764 /*
765 * Stop TX on this interface first.
766 */
767 if (sdata->dev)
768 netif_tx_stop_all_queues(sdata->dev);
769
770 ieee80211_roc_purge(sdata);
771
772 /*
773 * Remove all stations associated with this interface.
774 *
775 * This must be done before calling ops->remove_interface()
776 * because otherwise we can later invoke ops->sta_notify()
777 * whenever the STAs are removed, and that invalidates driver
778 * assumptions about always getting a vif pointer that is valid
779 * (because if we remove a STA after ops->remove_interface()
780 * the driver will have removed the vif info already!)
781 *
782 * This is relevant only in AP, WDS and mesh modes, since in
783 * all other modes we've already removed all stations when
784 * disconnecting etc.
785 */
786 sta_info_flush(local, sdata);
787
788 /*
789 * Don't count this interface for promisc/allmulti while it
790 * is down. dev_mc_unsync() will invoke set_multicast_list
791 * on the master interface which will sync these down to the
792 * hardware as filter flags.
793 */
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 ieee80211_configure_filter(local);
816 }
817
818 del_timer_sync(&local->dynamic_ps_timer);
819 cancel_work_sync(&local->dynamic_ps_enable_work);
820
821 cancel_work_sync(&sdata->recalc_smps);
822
823 /* APs need special treatment */
824 if (sdata->vif.type == NL80211_IFTYPE_AP) {
825 struct ieee80211_sub_if_data *vlan, *tmpsdata;
826
827 /* down all dependent devices, that is VLANs */
828 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
829 u.vlan.list)
830 dev_close(vlan->dev);
831 WARN_ON(!list_empty(&sdata->u.ap.vlans));
832 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
833 ieee80211_mgd_stop(sdata);
834 }
835
836 if (going_down)
837 local->open_count--;
838
839 switch (sdata->vif.type) {
840 case NL80211_IFTYPE_AP_VLAN:
841 list_del(&sdata->u.vlan.list);
842 /* no need to tell driver */
843 break;
844 case NL80211_IFTYPE_MONITOR:
845 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
846 local->cooked_mntrs--;
847 break;
848 }
849
850 local->monitors--;
851 if (local->monitors == 0) {
852 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
853 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
854 ieee80211_del_virtual_monitor(local);
855 }
856
857 ieee80211_adjust_monitor_flags(sdata, -1);
858 ieee80211_configure_filter(local);
859 break;
860 case NL80211_IFTYPE_P2P_DEVICE:
861 /* relies on synchronize_rcu() below */
862 rcu_assign_pointer(local->p2p_sdata, NULL);
863 /* fall through */
864 default:
865 cancel_work_sync(&sdata->work);
866 /*
867 * When we get here, the interface is marked down.
868 * Call rcu_barrier() to wait both for the RX path
869 * should it be using the interface and enqueuing
870 * frames at this very time on another CPU, and
871 * for the sta free call_rcu callbacks.
872 */
873 rcu_barrier();
874
875 /*
876 * free_sta_rcu() enqueues a work for the actual
877 * sta cleanup, so we need to flush it while
878 * sdata is still valid.
879 */
880 flush_workqueue(local->workqueue);
881
882 skb_queue_purge(&sdata->skb_queue);
883
884 /*
885 * Free all remaining keys, there shouldn't be any,
886 * except maybe group keys in AP more or WDS?
887 */
888 ieee80211_free_keys(sdata);
889
890 if (going_down)
891 drv_remove_interface(local, sdata);
892 }
893
894 sdata->bss = NULL;
895
896 mutex_lock(&local->mtx);
897 hw_reconf_flags |= __ieee80211_recalc_idle(local);
898 mutex_unlock(&local->mtx);
899
900 ieee80211_recalc_ps(local, -1);
901
902 if (local->open_count == 0) {
903 if (local->ops->napi_poll)
904 napi_disable(&local->napi);
905 ieee80211_clear_tx_pending(local);
906 ieee80211_stop_device(local);
907
908 /* no reconfiguring after stop! */
909 hw_reconf_flags = 0;
910 }
911
912 /* do after stop to avoid reconfiguring when we stop anyway */
913 if (hw_reconf_flags)
914 ieee80211_hw_config(local, hw_reconf_flags);
915
916 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
917 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
918 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 if (info->control.vif == &sdata->vif) {
921 __skb_unlink(skb, &local->pending[i]);
922 ieee80211_free_txskb(&local->hw, skb);
923 }
924 }
925 }
926 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
927
928 if (local->monitors == local->open_count && local->monitors > 0)
929 ieee80211_add_virtual_monitor(local);
930 }
931
932 static int ieee80211_stop(struct net_device *dev)
933 {
934 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
935
936 ieee80211_do_stop(sdata, true);
937
938 return 0;
939 }
940
941 static void ieee80211_set_multicast_list(struct net_device *dev)
942 {
943 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
944 struct ieee80211_local *local = sdata->local;
945 int allmulti, promisc, sdata_allmulti, sdata_promisc;
946
947 allmulti = !!(dev->flags & IFF_ALLMULTI);
948 promisc = !!(dev->flags & IFF_PROMISC);
949 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
950 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
951
952 if (allmulti != sdata_allmulti) {
953 if (dev->flags & IFF_ALLMULTI)
954 atomic_inc(&local->iff_allmultis);
955 else
956 atomic_dec(&local->iff_allmultis);
957 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
958 }
959
960 if (promisc != sdata_promisc) {
961 if (dev->flags & IFF_PROMISC)
962 atomic_inc(&local->iff_promiscs);
963 else
964 atomic_dec(&local->iff_promiscs);
965 sdata->flags ^= IEEE80211_SDATA_PROMISC;
966 }
967 spin_lock_bh(&local->filter_lock);
968 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
969 spin_unlock_bh(&local->filter_lock);
970 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
971 }
972
973 /*
974 * Called when the netdev is removed or, by the code below, before
975 * the interface type changes.
976 */
977 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
978 {
979 struct ieee80211_local *local = sdata->local;
980 int flushed;
981 int i;
982
983 /* free extra data */
984 ieee80211_free_keys(sdata);
985
986 ieee80211_debugfs_remove_netdev(sdata);
987
988 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
989 __skb_queue_purge(&sdata->fragments[i].skb_list);
990 sdata->fragment_next = 0;
991
992 if (ieee80211_vif_is_mesh(&sdata->vif))
993 mesh_rmc_free(sdata);
994
995 flushed = sta_info_flush(local, sdata);
996 WARN_ON(flushed);
997 }
998
999 static void ieee80211_uninit(struct net_device *dev)
1000 {
1001 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1002 }
1003
1004 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1005 struct sk_buff *skb)
1006 {
1007 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1008 }
1009
1010 static const struct net_device_ops ieee80211_dataif_ops = {
1011 .ndo_open = ieee80211_open,
1012 .ndo_stop = ieee80211_stop,
1013 .ndo_uninit = ieee80211_uninit,
1014 .ndo_start_xmit = ieee80211_subif_start_xmit,
1015 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1016 .ndo_change_mtu = ieee80211_change_mtu,
1017 .ndo_set_mac_address = ieee80211_change_mac,
1018 .ndo_select_queue = ieee80211_netdev_select_queue,
1019 };
1020
1021 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1022 struct sk_buff *skb)
1023 {
1024 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1025 struct ieee80211_local *local = sdata->local;
1026 struct ieee80211_hdr *hdr;
1027 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1028
1029 if (local->hw.queues < IEEE80211_NUM_ACS)
1030 return 0;
1031
1032 if (skb->len < 4 ||
1033 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1034 return 0; /* doesn't matter, frame will be dropped */
1035
1036 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1037
1038 return ieee80211_select_queue_80211(sdata, skb, hdr);
1039 }
1040
1041 static const struct net_device_ops ieee80211_monitorif_ops = {
1042 .ndo_open = ieee80211_open,
1043 .ndo_stop = ieee80211_stop,
1044 .ndo_uninit = ieee80211_uninit,
1045 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1046 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1047 .ndo_change_mtu = ieee80211_change_mtu,
1048 .ndo_set_mac_address = eth_mac_addr,
1049 .ndo_select_queue = ieee80211_monitor_select_queue,
1050 };
1051
1052 static void ieee80211_if_setup(struct net_device *dev)
1053 {
1054 ether_setup(dev);
1055 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1056 dev->netdev_ops = &ieee80211_dataif_ops;
1057 dev->destructor = free_netdev;
1058 }
1059
1060 static void ieee80211_iface_work(struct work_struct *work)
1061 {
1062 struct ieee80211_sub_if_data *sdata =
1063 container_of(work, struct ieee80211_sub_if_data, work);
1064 struct ieee80211_local *local = sdata->local;
1065 struct sk_buff *skb;
1066 struct sta_info *sta;
1067 struct ieee80211_ra_tid *ra_tid;
1068
1069 if (!ieee80211_sdata_running(sdata))
1070 return;
1071
1072 if (local->scanning)
1073 return;
1074
1075 /*
1076 * ieee80211_queue_work() should have picked up most cases,
1077 * here we'll pick the rest.
1078 */
1079 if (WARN(local->suspended,
1080 "interface work scheduled while going to suspend\n"))
1081 return;
1082
1083 /* first process frames */
1084 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1085 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1086
1087 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1088 ra_tid = (void *)&skb->cb;
1089 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1090 ra_tid->tid);
1091 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1092 ra_tid = (void *)&skb->cb;
1093 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1094 ra_tid->tid);
1095 } else if (ieee80211_is_action(mgmt->frame_control) &&
1096 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1097 int len = skb->len;
1098
1099 mutex_lock(&local->sta_mtx);
1100 sta = sta_info_get_bss(sdata, mgmt->sa);
1101 if (sta) {
1102 switch (mgmt->u.action.u.addba_req.action_code) {
1103 case WLAN_ACTION_ADDBA_REQ:
1104 ieee80211_process_addba_request(
1105 local, sta, mgmt, len);
1106 break;
1107 case WLAN_ACTION_ADDBA_RESP:
1108 ieee80211_process_addba_resp(local, sta,
1109 mgmt, len);
1110 break;
1111 case WLAN_ACTION_DELBA:
1112 ieee80211_process_delba(sdata, sta,
1113 mgmt, len);
1114 break;
1115 default:
1116 WARN_ON(1);
1117 break;
1118 }
1119 }
1120 mutex_unlock(&local->sta_mtx);
1121 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1122 struct ieee80211_hdr *hdr = (void *)mgmt;
1123 /*
1124 * So the frame isn't mgmt, but frame_control
1125 * is at the right place anyway, of course, so
1126 * the if statement is correct.
1127 *
1128 * Warn if we have other data frame types here,
1129 * they must not get here.
1130 */
1131 WARN_ON(hdr->frame_control &
1132 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1133 WARN_ON(!(hdr->seq_ctrl &
1134 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1135 /*
1136 * This was a fragment of a frame, received while
1137 * a block-ack session was active. That cannot be
1138 * right, so terminate the session.
1139 */
1140 mutex_lock(&local->sta_mtx);
1141 sta = sta_info_get_bss(sdata, mgmt->sa);
1142 if (sta) {
1143 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1144 IEEE80211_QOS_CTL_TID_MASK;
1145
1146 __ieee80211_stop_rx_ba_session(
1147 sta, tid, WLAN_BACK_RECIPIENT,
1148 WLAN_REASON_QSTA_REQUIRE_SETUP,
1149 true);
1150 }
1151 mutex_unlock(&local->sta_mtx);
1152 } else switch (sdata->vif.type) {
1153 case NL80211_IFTYPE_STATION:
1154 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1155 break;
1156 case NL80211_IFTYPE_ADHOC:
1157 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1158 break;
1159 case NL80211_IFTYPE_MESH_POINT:
1160 if (!ieee80211_vif_is_mesh(&sdata->vif))
1161 break;
1162 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1163 break;
1164 default:
1165 WARN(1, "frame for unexpected interface type");
1166 break;
1167 }
1168
1169 kfree_skb(skb);
1170 }
1171
1172 /* then other type-dependent work */
1173 switch (sdata->vif.type) {
1174 case NL80211_IFTYPE_STATION:
1175 ieee80211_sta_work(sdata);
1176 break;
1177 case NL80211_IFTYPE_ADHOC:
1178 ieee80211_ibss_work(sdata);
1179 break;
1180 case NL80211_IFTYPE_MESH_POINT:
1181 if (!ieee80211_vif_is_mesh(&sdata->vif))
1182 break;
1183 ieee80211_mesh_work(sdata);
1184 break;
1185 default:
1186 break;
1187 }
1188 }
1189
1190 static void ieee80211_recalc_smps_work(struct work_struct *work)
1191 {
1192 struct ieee80211_sub_if_data *sdata =
1193 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1194
1195 ieee80211_recalc_smps(sdata);
1196 }
1197
1198 /*
1199 * Helper function to initialise an interface to a specific type.
1200 */
1201 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1202 enum nl80211_iftype type)
1203 {
1204 /* clear type-dependent union */
1205 memset(&sdata->u, 0, sizeof(sdata->u));
1206
1207 /* and set some type-dependent values */
1208 sdata->vif.type = type;
1209 sdata->vif.p2p = false;
1210 sdata->wdev.iftype = type;
1211
1212 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1213 sdata->control_port_no_encrypt = false;
1214
1215 sdata->noack_map = 0;
1216
1217 /* only monitor/p2p-device differ */
1218 if (sdata->dev) {
1219 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1220 sdata->dev->type = ARPHRD_ETHER;
1221 }
1222
1223 skb_queue_head_init(&sdata->skb_queue);
1224 INIT_WORK(&sdata->work, ieee80211_iface_work);
1225 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1226
1227 switch (type) {
1228 case NL80211_IFTYPE_P2P_GO:
1229 type = NL80211_IFTYPE_AP;
1230 sdata->vif.type = type;
1231 sdata->vif.p2p = true;
1232 /* fall through */
1233 case NL80211_IFTYPE_AP:
1234 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1235 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1236 break;
1237 case NL80211_IFTYPE_P2P_CLIENT:
1238 type = NL80211_IFTYPE_STATION;
1239 sdata->vif.type = type;
1240 sdata->vif.p2p = true;
1241 /* fall through */
1242 case NL80211_IFTYPE_STATION:
1243 ieee80211_sta_setup_sdata(sdata);
1244 break;
1245 case NL80211_IFTYPE_ADHOC:
1246 ieee80211_ibss_setup_sdata(sdata);
1247 break;
1248 case NL80211_IFTYPE_MESH_POINT:
1249 if (ieee80211_vif_is_mesh(&sdata->vif))
1250 ieee80211_mesh_init_sdata(sdata);
1251 break;
1252 case NL80211_IFTYPE_MONITOR:
1253 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1254 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1255 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1256 MONITOR_FLAG_OTHER_BSS;
1257 break;
1258 case NL80211_IFTYPE_WDS:
1259 case NL80211_IFTYPE_AP_VLAN:
1260 case NL80211_IFTYPE_P2P_DEVICE:
1261 break;
1262 case NL80211_IFTYPE_UNSPECIFIED:
1263 case NUM_NL80211_IFTYPES:
1264 BUG();
1265 break;
1266 }
1267
1268 ieee80211_debugfs_add_netdev(sdata);
1269 }
1270
1271 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1272 enum nl80211_iftype type)
1273 {
1274 struct ieee80211_local *local = sdata->local;
1275 int ret, err;
1276 enum nl80211_iftype internal_type = type;
1277 bool p2p = false;
1278
1279 ASSERT_RTNL();
1280
1281 if (!local->ops->change_interface)
1282 return -EBUSY;
1283
1284 switch (sdata->vif.type) {
1285 case NL80211_IFTYPE_AP:
1286 case NL80211_IFTYPE_STATION:
1287 case NL80211_IFTYPE_ADHOC:
1288 /*
1289 * Could maybe also all others here?
1290 * Just not sure how that interacts
1291 * with the RX/config path e.g. for
1292 * mesh.
1293 */
1294 break;
1295 default:
1296 return -EBUSY;
1297 }
1298
1299 switch (type) {
1300 case NL80211_IFTYPE_AP:
1301 case NL80211_IFTYPE_STATION:
1302 case NL80211_IFTYPE_ADHOC:
1303 /*
1304 * Could probably support everything
1305 * but WDS here (WDS do_open can fail
1306 * under memory pressure, which this
1307 * code isn't prepared to handle).
1308 */
1309 break;
1310 case NL80211_IFTYPE_P2P_CLIENT:
1311 p2p = true;
1312 internal_type = NL80211_IFTYPE_STATION;
1313 break;
1314 case NL80211_IFTYPE_P2P_GO:
1315 p2p = true;
1316 internal_type = NL80211_IFTYPE_AP;
1317 break;
1318 default:
1319 return -EBUSY;
1320 }
1321
1322 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1323 if (ret)
1324 return ret;
1325
1326 ieee80211_do_stop(sdata, false);
1327
1328 ieee80211_teardown_sdata(sdata);
1329
1330 ret = drv_change_interface(local, sdata, internal_type, p2p);
1331 if (ret)
1332 type = sdata->vif.type;
1333
1334 /*
1335 * Ignore return value here, there's not much we can do since
1336 * the driver changed the interface type internally already.
1337 * The warnings will hopefully make driver authors fix it :-)
1338 */
1339 ieee80211_check_queues(sdata);
1340
1341 ieee80211_setup_sdata(sdata, type);
1342
1343 err = ieee80211_do_open(&sdata->wdev, false);
1344 WARN(err, "type change: do_open returned %d", err);
1345
1346 return ret;
1347 }
1348
1349 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1350 enum nl80211_iftype type)
1351 {
1352 int ret;
1353
1354 ASSERT_RTNL();
1355
1356 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1357 return 0;
1358
1359 if (ieee80211_sdata_running(sdata)) {
1360 ret = ieee80211_runtime_change_iftype(sdata, type);
1361 if (ret)
1362 return ret;
1363 } else {
1364 /* Purge and reset type-dependent state. */
1365 ieee80211_teardown_sdata(sdata);
1366 ieee80211_setup_sdata(sdata, type);
1367 }
1368
1369 /* reset some values that shouldn't be kept across type changes */
1370 sdata->drop_unencrypted = 0;
1371 if (type == NL80211_IFTYPE_STATION)
1372 sdata->u.mgd.use_4addr = false;
1373
1374 return 0;
1375 }
1376
1377 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1378 u8 *perm_addr, enum nl80211_iftype type)
1379 {
1380 struct ieee80211_sub_if_data *sdata;
1381 u64 mask, start, addr, val, inc;
1382 u8 *m;
1383 u8 tmp_addr[ETH_ALEN];
1384 int i;
1385
1386 /* default ... something at least */
1387 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1388
1389 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1390 local->hw.wiphy->n_addresses <= 1)
1391 return;
1392
1393 mutex_lock(&local->iflist_mtx);
1394
1395 switch (type) {
1396 case NL80211_IFTYPE_MONITOR:
1397 /* doesn't matter */
1398 break;
1399 case NL80211_IFTYPE_WDS:
1400 case NL80211_IFTYPE_AP_VLAN:
1401 /* match up with an AP interface */
1402 list_for_each_entry(sdata, &local->interfaces, list) {
1403 if (sdata->vif.type != NL80211_IFTYPE_AP)
1404 continue;
1405 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1406 break;
1407 }
1408 /* keep default if no AP interface present */
1409 break;
1410 case NL80211_IFTYPE_P2P_CLIENT:
1411 case NL80211_IFTYPE_P2P_GO:
1412 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1413 list_for_each_entry(sdata, &local->interfaces, list) {
1414 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1415 continue;
1416 if (!ieee80211_sdata_running(sdata))
1417 continue;
1418 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1419 goto out_unlock;
1420 }
1421 }
1422 /* otherwise fall through */
1423 default:
1424 /* assign a new address if possible -- try n_addresses first */
1425 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1426 bool used = false;
1427
1428 list_for_each_entry(sdata, &local->interfaces, list) {
1429 if (memcmp(local->hw.wiphy->addresses[i].addr,
1430 sdata->vif.addr, ETH_ALEN) == 0) {
1431 used = true;
1432 break;
1433 }
1434 }
1435
1436 if (!used) {
1437 memcpy(perm_addr,
1438 local->hw.wiphy->addresses[i].addr,
1439 ETH_ALEN);
1440 break;
1441 }
1442 }
1443
1444 /* try mask if available */
1445 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1446 break;
1447
1448 m = local->hw.wiphy->addr_mask;
1449 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1450 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1451 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1452
1453 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1454 /* not a contiguous mask ... not handled now! */
1455 pr_info("not contiguous\n");
1456 break;
1457 }
1458
1459 m = local->hw.wiphy->perm_addr;
1460 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1461 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1462 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1463
1464 inc = 1ULL<<__ffs64(mask);
1465 val = (start & mask);
1466 addr = (start & ~mask) | (val & mask);
1467 do {
1468 bool used = false;
1469
1470 tmp_addr[5] = addr >> 0*8;
1471 tmp_addr[4] = addr >> 1*8;
1472 tmp_addr[3] = addr >> 2*8;
1473 tmp_addr[2] = addr >> 3*8;
1474 tmp_addr[1] = addr >> 4*8;
1475 tmp_addr[0] = addr >> 5*8;
1476
1477 val += inc;
1478
1479 list_for_each_entry(sdata, &local->interfaces, list) {
1480 if (memcmp(tmp_addr, sdata->vif.addr,
1481 ETH_ALEN) == 0) {
1482 used = true;
1483 break;
1484 }
1485 }
1486
1487 if (!used) {
1488 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1489 break;
1490 }
1491 addr = (start & ~mask) | (val & mask);
1492 } while (addr != start);
1493
1494 break;
1495 }
1496
1497 out_unlock:
1498 mutex_unlock(&local->iflist_mtx);
1499 }
1500
1501 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1502 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1503 struct vif_params *params)
1504 {
1505 struct net_device *ndev = NULL;
1506 struct ieee80211_sub_if_data *sdata = NULL;
1507 int ret, i;
1508 int txqs = 1;
1509
1510 ASSERT_RTNL();
1511
1512 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1513 struct wireless_dev *wdev;
1514
1515 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1516 GFP_KERNEL);
1517 if (!sdata)
1518 return -ENOMEM;
1519 wdev = &sdata->wdev;
1520
1521 sdata->dev = NULL;
1522 strlcpy(sdata->name, name, IFNAMSIZ);
1523 ieee80211_assign_perm_addr(local, wdev->address, type);
1524 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1525 } else {
1526 if (local->hw.queues >= IEEE80211_NUM_ACS)
1527 txqs = IEEE80211_NUM_ACS;
1528
1529 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1530 local->hw.vif_data_size,
1531 name, ieee80211_if_setup, txqs, 1);
1532 if (!ndev)
1533 return -ENOMEM;
1534 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1535
1536 ndev->needed_headroom = local->tx_headroom +
1537 4*6 /* four MAC addresses */
1538 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1539 + 6 /* mesh */
1540 + 8 /* rfc1042/bridge tunnel */
1541 - ETH_HLEN /* ethernet hard_header_len */
1542 + IEEE80211_ENCRYPT_HEADROOM;
1543 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1544
1545 ret = dev_alloc_name(ndev, ndev->name);
1546 if (ret < 0) {
1547 free_netdev(ndev);
1548 return ret;
1549 }
1550
1551 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1552 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1553 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1554
1555 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1556 sdata = netdev_priv(ndev);
1557 ndev->ieee80211_ptr = &sdata->wdev;
1558 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1559 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1560
1561 sdata->dev = ndev;
1562 }
1563
1564 /* initialise type-independent data */
1565 sdata->wdev.wiphy = local->hw.wiphy;
1566 sdata->local = local;
1567 #ifdef CONFIG_INET
1568 sdata->arp_filter_state = true;
1569 #endif
1570
1571 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1572 skb_queue_head_init(&sdata->fragments[i].skb_list);
1573
1574 INIT_LIST_HEAD(&sdata->key_list);
1575
1576 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1577 struct ieee80211_supported_band *sband;
1578 sband = local->hw.wiphy->bands[i];
1579 sdata->rc_rateidx_mask[i] =
1580 sband ? (1 << sband->n_bitrates) - 1 : 0;
1581 if (sband)
1582 memcpy(sdata->rc_rateidx_mcs_mask[i],
1583 sband->ht_cap.mcs.rx_mask,
1584 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1585 else
1586 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1587 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1588 }
1589
1590 ieee80211_set_default_queues(sdata);
1591
1592 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1593 sdata->user_power_level = local->user_power_level;
1594
1595 /* setup type-dependent data */
1596 ieee80211_setup_sdata(sdata, type);
1597
1598 if (ndev) {
1599 if (params) {
1600 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1601 if (type == NL80211_IFTYPE_STATION)
1602 sdata->u.mgd.use_4addr = params->use_4addr;
1603 }
1604
1605 ndev->features |= local->hw.netdev_features;
1606
1607 ret = register_netdevice(ndev);
1608 if (ret) {
1609 free_netdev(ndev);
1610 return ret;
1611 }
1612 }
1613
1614 mutex_lock(&local->iflist_mtx);
1615 list_add_tail_rcu(&sdata->list, &local->interfaces);
1616 mutex_unlock(&local->iflist_mtx);
1617
1618 if (new_wdev)
1619 *new_wdev = &sdata->wdev;
1620
1621 return 0;
1622 }
1623
1624 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1625 {
1626 ASSERT_RTNL();
1627
1628 mutex_lock(&sdata->local->iflist_mtx);
1629 list_del_rcu(&sdata->list);
1630 mutex_unlock(&sdata->local->iflist_mtx);
1631
1632 synchronize_rcu();
1633
1634 if (sdata->dev) {
1635 unregister_netdevice(sdata->dev);
1636 } else {
1637 cfg80211_unregister_wdev(&sdata->wdev);
1638 kfree(sdata);
1639 }
1640 }
1641
1642 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1643 {
1644 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1645 return;
1646 ieee80211_do_stop(sdata, true);
1647 ieee80211_teardown_sdata(sdata);
1648 }
1649
1650 /*
1651 * Remove all interfaces, may only be called at hardware unregistration
1652 * time because it doesn't do RCU-safe list removals.
1653 */
1654 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1655 {
1656 struct ieee80211_sub_if_data *sdata, *tmp;
1657 LIST_HEAD(unreg_list);
1658 LIST_HEAD(wdev_list);
1659
1660 ASSERT_RTNL();
1661
1662 mutex_lock(&local->iflist_mtx);
1663 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1664 list_del(&sdata->list);
1665
1666 if (sdata->dev)
1667 unregister_netdevice_queue(sdata->dev, &unreg_list);
1668 else
1669 list_add(&sdata->list, &wdev_list);
1670 }
1671 mutex_unlock(&local->iflist_mtx);
1672 unregister_netdevice_many(&unreg_list);
1673 list_del(&unreg_list);
1674
1675 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1676 list_del(&sdata->list);
1677 cfg80211_unregister_wdev(&sdata->wdev);
1678 kfree(sdata);
1679 }
1680 }
1681
1682 static int netdev_notify(struct notifier_block *nb,
1683 unsigned long state,
1684 void *ndev)
1685 {
1686 struct net_device *dev = ndev;
1687 struct ieee80211_sub_if_data *sdata;
1688
1689 if (state != NETDEV_CHANGENAME)
1690 return 0;
1691
1692 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1693 return 0;
1694
1695 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1696 return 0;
1697
1698 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1699
1700 memcpy(sdata->name, dev->name, IFNAMSIZ);
1701
1702 ieee80211_debugfs_rename_netdev(sdata);
1703 return 0;
1704 }
1705
1706 static struct notifier_block mac80211_netdev_notifier = {
1707 .notifier_call = netdev_notify,
1708 };
1709
1710 int ieee80211_iface_init(void)
1711 {
1712 return register_netdevice_notifier(&mac80211_netdev_notifier);
1713 }
1714
1715 void ieee80211_iface_exit(void)
1716 {
1717 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1718 }
kernel source for telekom puls (alcatel/mediatek)