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Merge tag 'for-linus-20130204' of git://git.infradead.org/linux-mtd
[linux-2.6/libata-dev.git] / net / mac80211 / iface.c
blob8be854e86cd987d61e01cc7eabc8f7ddb068eff3
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 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
211 return -EINVAL;
212
213 dev->mtu = new_mtu;
214 return 0;
215 }
216
217 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
218 {
219 struct ieee80211_sub_if_data *sdata;
220 u64 new, mask, tmp;
221 u8 *m;
222 int ret = 0;
223
224 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
225 return 0;
226
227 m = addr;
228 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
229 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
230 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
231
232 m = local->hw.wiphy->addr_mask;
233 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
234 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
235 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
236
237
238 mutex_lock(&local->iflist_mtx);
239 list_for_each_entry(sdata, &local->interfaces, list) {
240 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
241 continue;
242
243 m = sdata->vif.addr;
244 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
245 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
246 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
247
248 if ((new & ~mask) != (tmp & ~mask)) {
249 ret = -EINVAL;
250 break;
251 }
252 }
253 mutex_unlock(&local->iflist_mtx);
254
255 return ret;
256 }
257
258 static int ieee80211_change_mac(struct net_device *dev, void *addr)
259 {
260 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
261 struct sockaddr *sa = addr;
262 int ret;
263
264 if (ieee80211_sdata_running(sdata))
265 return -EBUSY;
266
267 ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
268 if (ret)
269 return ret;
270
271 ret = eth_mac_addr(dev, sa);
272
273 if (ret == 0)
274 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
275
276 return ret;
277 }
278
279 static inline int identical_mac_addr_allowed(int type1, int type2)
280 {
281 return type1 == NL80211_IFTYPE_MONITOR ||
282 type2 == NL80211_IFTYPE_MONITOR ||
283 type1 == NL80211_IFTYPE_P2P_DEVICE ||
284 type2 == NL80211_IFTYPE_P2P_DEVICE ||
285 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
286 (type1 == NL80211_IFTYPE_WDS &&
287 (type2 == NL80211_IFTYPE_WDS ||
288 type2 == NL80211_IFTYPE_AP)) ||
289 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
290 (type1 == NL80211_IFTYPE_AP_VLAN &&
291 (type2 == NL80211_IFTYPE_AP ||
292 type2 == NL80211_IFTYPE_AP_VLAN));
293 }
294
295 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
296 enum nl80211_iftype iftype)
297 {
298 struct ieee80211_local *local = sdata->local;
299 struct ieee80211_sub_if_data *nsdata;
300
301 ASSERT_RTNL();
302
303 /* we hold the RTNL here so can safely walk the list */
304 list_for_each_entry(nsdata, &local->interfaces, list) {
305 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
306 /*
307 * Allow only a single IBSS interface to be up at any
308 * time. This is restricted because beacon distribution
309 * cannot work properly if both are in the same IBSS.
310 *
311 * To remove this restriction we'd have to disallow them
312 * from setting the same SSID on different IBSS interfaces
313 * belonging to the same hardware. Then, however, we're
314 * faced with having to adopt two different TSF timers...
315 */
316 if (iftype == NL80211_IFTYPE_ADHOC &&
317 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
318 return -EBUSY;
319
320 /*
321 * The remaining checks are only performed for interfaces
322 * with the same MAC address.
323 */
324 if (!ether_addr_equal(sdata->vif.addr,
325 nsdata->vif.addr))
326 continue;
327
328 /*
329 * check whether it may have the same address
330 */
331 if (!identical_mac_addr_allowed(iftype,
332 nsdata->vif.type))
333 return -ENOTUNIQ;
334
335 /*
336 * can only add VLANs to enabled APs
337 */
338 if (iftype == NL80211_IFTYPE_AP_VLAN &&
339 nsdata->vif.type == NL80211_IFTYPE_AP)
340 sdata->bss = &nsdata->u.ap;
341 }
342 }
343
344 return 0;
345 }
346
347 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
348 {
349 int n_queues = sdata->local->hw.queues;
350 int i;
351
352 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
353 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
354 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
355 IEEE80211_INVAL_HW_QUEUE))
356 return -EINVAL;
357 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
358 n_queues))
359 return -EINVAL;
360 }
361 }
362
363 if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
364 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
365 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
366 return 0;
367 }
368
369 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
370 return -EINVAL;
371
372 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
373 return -EINVAL;
374
375 return 0;
376 }
377
378 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
379 const int offset)
380 {
381 struct ieee80211_local *local = sdata->local;
382 u32 flags = sdata->u.mntr_flags;
383
384 #define ADJUST(_f, _s) do { \
385 if (flags & MONITOR_FLAG_##_f) \
386 local->fif_##_s += offset; \
387 } while (0)
388
389 ADJUST(FCSFAIL, fcsfail);
390 ADJUST(PLCPFAIL, plcpfail);
391 ADJUST(CONTROL, control);
392 ADJUST(CONTROL, pspoll);
393 ADJUST(OTHER_BSS, other_bss);
394
395 #undef ADJUST
396 }
397
398 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
399 {
400 struct ieee80211_local *local = sdata->local;
401 int i;
402
403 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
404 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
405 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
406 else if (local->hw.queues >= IEEE80211_NUM_ACS)
407 sdata->vif.hw_queue[i] = i;
408 else
409 sdata->vif.hw_queue[i] = 0;
410 }
411 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
412 }
413
414 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
415 {
416 struct ieee80211_sub_if_data *sdata;
417 int ret = 0;
418
419 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
420 return 0;
421
422 mutex_lock(&local->iflist_mtx);
423
424 if (local->monitor_sdata)
425 goto out_unlock;
426
427 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
428 if (!sdata) {
429 ret = -ENOMEM;
430 goto out_unlock;
431 }
432
433 /* set up data */
434 sdata->local = local;
435 sdata->vif.type = NL80211_IFTYPE_MONITOR;
436 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
437 wiphy_name(local->hw.wiphy));
438
439 ieee80211_set_default_queues(sdata);
440
441 ret = drv_add_interface(local, sdata);
442 if (WARN_ON(ret)) {
443 /* ok .. stupid driver, it asked for this! */
444 kfree(sdata);
445 goto out_unlock;
446 }
447
448 ret = ieee80211_check_queues(sdata);
449 if (ret) {
450 kfree(sdata);
451 goto out_unlock;
452 }
453
454 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
455 IEEE80211_CHANCTX_EXCLUSIVE);
456 if (ret) {
457 drv_remove_interface(local, sdata);
458 kfree(sdata);
459 goto out_unlock;
460 }
461
462 rcu_assign_pointer(local->monitor_sdata, sdata);
463 out_unlock:
464 mutex_unlock(&local->iflist_mtx);
465 return ret;
466 }
467
468 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
469 {
470 struct ieee80211_sub_if_data *sdata;
471
472 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
473 return;
474
475 mutex_lock(&local->iflist_mtx);
476
477 sdata = rcu_dereference_protected(local->monitor_sdata,
478 lockdep_is_held(&local->iflist_mtx));
479 if (!sdata)
480 goto out_unlock;
481
482 rcu_assign_pointer(local->monitor_sdata, NULL);
483 synchronize_net();
484
485 ieee80211_vif_release_channel(sdata);
486
487 drv_remove_interface(local, sdata);
488
489 kfree(sdata);
490 out_unlock:
491 mutex_unlock(&local->iflist_mtx);
492 }
493
494 /*
495 * NOTE: Be very careful when changing this function, it must NOT return
496 * an error on interface type changes that have been pre-checked, so most
497 * checks should be in ieee80211_check_concurrent_iface.
498 */
499 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
500 {
501 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
502 struct net_device *dev = wdev->netdev;
503 struct ieee80211_local *local = sdata->local;
504 struct sta_info *sta;
505 u32 changed = 0;
506 int res;
507 u32 hw_reconf_flags = 0;
508
509 switch (sdata->vif.type) {
510 case NL80211_IFTYPE_WDS:
511 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
512 return -ENOLINK;
513 break;
514 case NL80211_IFTYPE_AP_VLAN: {
515 struct ieee80211_sub_if_data *master;
516
517 if (!sdata->bss)
518 return -ENOLINK;
519
520 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
521
522 master = container_of(sdata->bss,
523 struct ieee80211_sub_if_data, u.ap);
524 sdata->control_port_protocol =
525 master->control_port_protocol;
526 sdata->control_port_no_encrypt =
527 master->control_port_no_encrypt;
528 break;
529 }
530 case NL80211_IFTYPE_AP:
531 sdata->bss = &sdata->u.ap;
532 break;
533 case NL80211_IFTYPE_MESH_POINT:
534 case NL80211_IFTYPE_STATION:
535 case NL80211_IFTYPE_MONITOR:
536 case NL80211_IFTYPE_ADHOC:
537 case NL80211_IFTYPE_P2P_DEVICE:
538 /* no special treatment */
539 break;
540 case NL80211_IFTYPE_UNSPECIFIED:
541 case NUM_NL80211_IFTYPES:
542 case NL80211_IFTYPE_P2P_CLIENT:
543 case NL80211_IFTYPE_P2P_GO:
544 /* cannot happen */
545 WARN_ON(1);
546 break;
547 }
548
549 if (local->open_count == 0) {
550 res = drv_start(local);
551 if (res)
552 goto err_del_bss;
553 if (local->ops->napi_poll)
554 napi_enable(&local->napi);
555 /* we're brought up, everything changes */
556 hw_reconf_flags = ~0;
557 ieee80211_led_radio(local, true);
558 ieee80211_mod_tpt_led_trig(local,
559 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
560 }
561
562 /*
563 * Copy the hopefully now-present MAC address to
564 * this interface, if it has the special null one.
565 */
566 if (dev && is_zero_ether_addr(dev->dev_addr)) {
567 memcpy(dev->dev_addr,
568 local->hw.wiphy->perm_addr,
569 ETH_ALEN);
570 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
571
572 if (!is_valid_ether_addr(dev->dev_addr)) {
573 res = -EADDRNOTAVAIL;
574 goto err_stop;
575 }
576 }
577
578 switch (sdata->vif.type) {
579 case NL80211_IFTYPE_AP_VLAN:
580 /* no need to tell driver, but set carrier and chanctx */
581 if (rtnl_dereference(sdata->bss->beacon)) {
582 ieee80211_vif_vlan_copy_chanctx(sdata);
583 netif_carrier_on(dev);
584 } else {
585 netif_carrier_off(dev);
586 }
587 break;
588 case NL80211_IFTYPE_MONITOR:
589 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
590 local->cooked_mntrs++;
591 break;
592 }
593
594 if (local->monitors == 0 && local->open_count == 0) {
595 res = ieee80211_add_virtual_monitor(local);
596 if (res)
597 goto err_stop;
598 }
599
600 /* must be before the call to ieee80211_configure_filter */
601 local->monitors++;
602 if (local->monitors == 1) {
603 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
604 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
605 }
606
607 ieee80211_adjust_monitor_flags(sdata, 1);
608 ieee80211_configure_filter(local);
609
610 netif_carrier_on(dev);
611 break;
612 default:
613 if (coming_up) {
614 ieee80211_del_virtual_monitor(local);
615
616 res = drv_add_interface(local, sdata);
617 if (res)
618 goto err_stop;
619 res = ieee80211_check_queues(sdata);
620 if (res)
621 goto err_del_interface;
622 }
623
624 if (sdata->vif.type == NL80211_IFTYPE_AP) {
625 local->fif_pspoll++;
626 local->fif_probe_req++;
627
628 ieee80211_configure_filter(local);
629 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
630 local->fif_probe_req++;
631 }
632
633 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
634 changed |= ieee80211_reset_erp_info(sdata);
635 ieee80211_bss_info_change_notify(sdata, changed);
636
637 switch (sdata->vif.type) {
638 case NL80211_IFTYPE_STATION:
639 case NL80211_IFTYPE_ADHOC:
640 case NL80211_IFTYPE_AP:
641 case NL80211_IFTYPE_MESH_POINT:
642 netif_carrier_off(dev);
643 break;
644 case NL80211_IFTYPE_WDS:
645 case NL80211_IFTYPE_P2P_DEVICE:
646 break;
647 default:
648 netif_carrier_on(dev);
649 }
650
651 /*
652 * set default queue parameters so drivers don't
653 * need to initialise the hardware if the hardware
654 * doesn't start up with sane defaults
655 */
656 ieee80211_set_wmm_default(sdata, true);
657 }
658
659 set_bit(SDATA_STATE_RUNNING, &sdata->state);
660
661 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
662 /* Create STA entry for the WDS peer */
663 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
664 GFP_KERNEL);
665 if (!sta) {
666 res = -ENOMEM;
667 goto err_del_interface;
668 }
669
670 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
671 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
672 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
673
674 res = sta_info_insert(sta);
675 if (res) {
676 /* STA has been freed */
677 goto err_del_interface;
678 }
679
680 rate_control_rate_init(sta);
681 netif_carrier_on(dev);
682 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
683 rcu_assign_pointer(local->p2p_sdata, sdata);
684 }
685
686 /*
687 * set_multicast_list will be invoked by the networking core
688 * which will check whether any increments here were done in
689 * error and sync them down to the hardware as filter flags.
690 */
691 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
692 atomic_inc(&local->iff_allmultis);
693
694 if (sdata->flags & IEEE80211_SDATA_PROMISC)
695 atomic_inc(&local->iff_promiscs);
696
697 mutex_lock(&local->mtx);
698 hw_reconf_flags |= __ieee80211_recalc_idle(local);
699 mutex_unlock(&local->mtx);
700
701 if (coming_up)
702 local->open_count++;
703
704 if (hw_reconf_flags)
705 ieee80211_hw_config(local, hw_reconf_flags);
706
707 ieee80211_recalc_ps(local, -1);
708
709 if (dev)
710 netif_tx_start_all_queues(dev);
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;
751
752 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
753
754 if (rcu_access_pointer(local->scan_sdata) == sdata)
755 ieee80211_scan_cancel(local);
756
757 /*
758 * Stop TX on this interface first.
759 */
760 if (sdata->dev)
761 netif_tx_stop_all_queues(sdata->dev);
762
763 ieee80211_roc_purge(sdata);
764
765 /*
766 * Remove all stations associated with this interface.
767 *
768 * This must be done before calling ops->remove_interface()
769 * because otherwise we can later invoke ops->sta_notify()
770 * whenever the STAs are removed, and that invalidates driver
771 * assumptions about always getting a vif pointer that is valid
772 * (because if we remove a STA after ops->remove_interface()
773 * the driver will have removed the vif info already!)
774 *
775 * This is relevant only in AP, WDS and mesh modes, since in
776 * all other modes we've already removed all stations when
777 * disconnecting etc.
778 */
779 sta_info_flush(local, sdata);
780
781 /*
782 * Don't count this interface for promisc/allmulti while it
783 * is down. dev_mc_unsync() will invoke set_multicast_list
784 * on the master interface which will sync these down to the
785 * hardware as filter flags.
786 */
787 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
788 atomic_dec(&local->iff_allmultis);
789
790 if (sdata->flags & IEEE80211_SDATA_PROMISC)
791 atomic_dec(&local->iff_promiscs);
792
793 if (sdata->vif.type == NL80211_IFTYPE_AP) {
794 local->fif_pspoll--;
795 local->fif_probe_req--;
796 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
797 local->fif_probe_req--;
798 }
799
800 if (sdata->dev) {
801 netif_addr_lock_bh(sdata->dev);
802 spin_lock_bh(&local->filter_lock);
803 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
804 sdata->dev->addr_len);
805 spin_unlock_bh(&local->filter_lock);
806 netif_addr_unlock_bh(sdata->dev);
807
808 ieee80211_configure_filter(local);
809 }
810
811 del_timer_sync(&local->dynamic_ps_timer);
812 cancel_work_sync(&local->dynamic_ps_enable_work);
813
814 cancel_work_sync(&sdata->recalc_smps);
815
816 /* APs need special treatment */
817 if (sdata->vif.type == NL80211_IFTYPE_AP) {
818 struct ieee80211_sub_if_data *vlan, *tmpsdata;
819
820 /* down all dependent devices, that is VLANs */
821 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
822 u.vlan.list)
823 dev_close(vlan->dev);
824 WARN_ON(!list_empty(&sdata->u.ap.vlans));
825 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
826 ieee80211_mgd_stop(sdata);
827 }
828
829 if (going_down)
830 local->open_count--;
831
832 switch (sdata->vif.type) {
833 case NL80211_IFTYPE_AP_VLAN:
834 list_del(&sdata->u.vlan.list);
835 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
836 /* no need to tell driver */
837 break;
838 case NL80211_IFTYPE_MONITOR:
839 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
840 local->cooked_mntrs--;
841 break;
842 }
843
844 local->monitors--;
845 if (local->monitors == 0) {
846 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
847 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
848 ieee80211_del_virtual_monitor(local);
849 }
850
851 ieee80211_adjust_monitor_flags(sdata, -1);
852 ieee80211_configure_filter(local);
853 break;
854 case NL80211_IFTYPE_P2P_DEVICE:
855 /* relies on synchronize_rcu() below */
856 rcu_assign_pointer(local->p2p_sdata, NULL);
857 /* fall through */
858 default:
859 cancel_work_sync(&sdata->work);
860 /*
861 * When we get here, the interface is marked down.
862 * Call synchronize_rcu() to wait for the RX path
863 * should it be using the interface and enqueuing
864 * frames at this very time on another CPU.
865 */
866 synchronize_rcu();
867 skb_queue_purge(&sdata->skb_queue);
868
869 /*
870 * Free all remaining keys, there shouldn't be any,
871 * except maybe group keys in AP more or WDS?
872 */
873 ieee80211_free_keys(sdata);
874
875 if (going_down)
876 drv_remove_interface(local, sdata);
877 }
878
879 sdata->bss = NULL;
880
881 mutex_lock(&local->mtx);
882 hw_reconf_flags |= __ieee80211_recalc_idle(local);
883 mutex_unlock(&local->mtx);
884
885 ieee80211_recalc_ps(local, -1);
886
887 if (local->open_count == 0) {
888 if (local->ops->napi_poll)
889 napi_disable(&local->napi);
890 ieee80211_clear_tx_pending(local);
891 ieee80211_stop_device(local);
892
893 /* no reconfiguring after stop! */
894 hw_reconf_flags = 0;
895 }
896
897 /* do after stop to avoid reconfiguring when we stop anyway */
898 if (hw_reconf_flags)
899 ieee80211_hw_config(local, hw_reconf_flags);
900
901 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
902 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
903 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
904 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
905 if (info->control.vif == &sdata->vif) {
906 __skb_unlink(skb, &local->pending[i]);
907 ieee80211_free_txskb(&local->hw, skb);
908 }
909 }
910 }
911 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
912
913 if (local->monitors == local->open_count && local->monitors > 0)
914 ieee80211_add_virtual_monitor(local);
915 }
916
917 static int ieee80211_stop(struct net_device *dev)
918 {
919 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
920
921 ieee80211_do_stop(sdata, true);
922
923 return 0;
924 }
925
926 static void ieee80211_set_multicast_list(struct net_device *dev)
927 {
928 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
929 struct ieee80211_local *local = sdata->local;
930 int allmulti, promisc, sdata_allmulti, sdata_promisc;
931
932 allmulti = !!(dev->flags & IFF_ALLMULTI);
933 promisc = !!(dev->flags & IFF_PROMISC);
934 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
935 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
936
937 if (allmulti != sdata_allmulti) {
938 if (dev->flags & IFF_ALLMULTI)
939 atomic_inc(&local->iff_allmultis);
940 else
941 atomic_dec(&local->iff_allmultis);
942 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
943 }
944
945 if (promisc != sdata_promisc) {
946 if (dev->flags & IFF_PROMISC)
947 atomic_inc(&local->iff_promiscs);
948 else
949 atomic_dec(&local->iff_promiscs);
950 sdata->flags ^= IEEE80211_SDATA_PROMISC;
951 }
952 spin_lock_bh(&local->filter_lock);
953 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
954 spin_unlock_bh(&local->filter_lock);
955 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
956 }
957
958 /*
959 * Called when the netdev is removed or, by the code below, before
960 * the interface type changes.
961 */
962 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
963 {
964 struct ieee80211_local *local = sdata->local;
965 int flushed;
966 int i;
967
968 /* free extra data */
969 ieee80211_free_keys(sdata);
970
971 ieee80211_debugfs_remove_netdev(sdata);
972
973 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
974 __skb_queue_purge(&sdata->fragments[i].skb_list);
975 sdata->fragment_next = 0;
976
977 if (ieee80211_vif_is_mesh(&sdata->vif))
978 mesh_rmc_free(sdata);
979
980 flushed = sta_info_flush(local, sdata);
981 WARN_ON(flushed);
982 }
983
984 static void ieee80211_uninit(struct net_device *dev)
985 {
986 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
987 }
988
989 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
990 struct sk_buff *skb)
991 {
992 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
993 }
994
995 static const struct net_device_ops ieee80211_dataif_ops = {
996 .ndo_open = ieee80211_open,
997 .ndo_stop = ieee80211_stop,
998 .ndo_uninit = ieee80211_uninit,
999 .ndo_start_xmit = ieee80211_subif_start_xmit,
1000 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1001 .ndo_change_mtu = ieee80211_change_mtu,
1002 .ndo_set_mac_address = ieee80211_change_mac,
1003 .ndo_select_queue = ieee80211_netdev_select_queue,
1004 };
1005
1006 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1007 struct sk_buff *skb)
1008 {
1009 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1010 struct ieee80211_local *local = sdata->local;
1011 struct ieee80211_hdr *hdr;
1012 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1013
1014 if (local->hw.queues < IEEE80211_NUM_ACS)
1015 return 0;
1016
1017 if (skb->len < 4 ||
1018 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1019 return 0; /* doesn't matter, frame will be dropped */
1020
1021 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1022
1023 return ieee80211_select_queue_80211(sdata, skb, hdr);
1024 }
1025
1026 static const struct net_device_ops ieee80211_monitorif_ops = {
1027 .ndo_open = ieee80211_open,
1028 .ndo_stop = ieee80211_stop,
1029 .ndo_uninit = ieee80211_uninit,
1030 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1031 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1032 .ndo_change_mtu = ieee80211_change_mtu,
1033 .ndo_set_mac_address = eth_mac_addr,
1034 .ndo_select_queue = ieee80211_monitor_select_queue,
1035 };
1036
1037 static void ieee80211_if_setup(struct net_device *dev)
1038 {
1039 ether_setup(dev);
1040 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1041 dev->netdev_ops = &ieee80211_dataif_ops;
1042 dev->destructor = free_netdev;
1043 }
1044
1045 static void ieee80211_iface_work(struct work_struct *work)
1046 {
1047 struct ieee80211_sub_if_data *sdata =
1048 container_of(work, struct ieee80211_sub_if_data, work);
1049 struct ieee80211_local *local = sdata->local;
1050 struct sk_buff *skb;
1051 struct sta_info *sta;
1052 struct ieee80211_ra_tid *ra_tid;
1053
1054 if (!ieee80211_sdata_running(sdata))
1055 return;
1056
1057 if (local->scanning)
1058 return;
1059
1060 /*
1061 * ieee80211_queue_work() should have picked up most cases,
1062 * here we'll pick the rest.
1063 */
1064 if (WARN(local->suspended,
1065 "interface work scheduled while going to suspend\n"))
1066 return;
1067
1068 /* first process frames */
1069 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1070 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1071
1072 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1073 ra_tid = (void *)&skb->cb;
1074 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1075 ra_tid->tid);
1076 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1077 ra_tid = (void *)&skb->cb;
1078 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1079 ra_tid->tid);
1080 } else if (ieee80211_is_action(mgmt->frame_control) &&
1081 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1082 int len = skb->len;
1083
1084 mutex_lock(&local->sta_mtx);
1085 sta = sta_info_get_bss(sdata, mgmt->sa);
1086 if (sta) {
1087 switch (mgmt->u.action.u.addba_req.action_code) {
1088 case WLAN_ACTION_ADDBA_REQ:
1089 ieee80211_process_addba_request(
1090 local, sta, mgmt, len);
1091 break;
1092 case WLAN_ACTION_ADDBA_RESP:
1093 ieee80211_process_addba_resp(local, sta,
1094 mgmt, len);
1095 break;
1096 case WLAN_ACTION_DELBA:
1097 ieee80211_process_delba(sdata, sta,
1098 mgmt, len);
1099 break;
1100 default:
1101 WARN_ON(1);
1102 break;
1103 }
1104 }
1105 mutex_unlock(&local->sta_mtx);
1106 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1107 struct ieee80211_hdr *hdr = (void *)mgmt;
1108 /*
1109 * So the frame isn't mgmt, but frame_control
1110 * is at the right place anyway, of course, so
1111 * the if statement is correct.
1112 *
1113 * Warn if we have other data frame types here,
1114 * they must not get here.
1115 */
1116 WARN_ON(hdr->frame_control &
1117 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1118 WARN_ON(!(hdr->seq_ctrl &
1119 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1120 /*
1121 * This was a fragment of a frame, received while
1122 * a block-ack session was active. That cannot be
1123 * right, so terminate the session.
1124 */
1125 mutex_lock(&local->sta_mtx);
1126 sta = sta_info_get_bss(sdata, mgmt->sa);
1127 if (sta) {
1128 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1129 IEEE80211_QOS_CTL_TID_MASK;
1130
1131 __ieee80211_stop_rx_ba_session(
1132 sta, tid, WLAN_BACK_RECIPIENT,
1133 WLAN_REASON_QSTA_REQUIRE_SETUP,
1134 true);
1135 }
1136 mutex_unlock(&local->sta_mtx);
1137 } else switch (sdata->vif.type) {
1138 case NL80211_IFTYPE_STATION:
1139 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1140 break;
1141 case NL80211_IFTYPE_ADHOC:
1142 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1143 break;
1144 case NL80211_IFTYPE_MESH_POINT:
1145 if (!ieee80211_vif_is_mesh(&sdata->vif))
1146 break;
1147 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1148 break;
1149 default:
1150 WARN(1, "frame for unexpected interface type");
1151 break;
1152 }
1153
1154 kfree_skb(skb);
1155 }
1156
1157 /* then other type-dependent work */
1158 switch (sdata->vif.type) {
1159 case NL80211_IFTYPE_STATION:
1160 ieee80211_sta_work(sdata);
1161 break;
1162 case NL80211_IFTYPE_ADHOC:
1163 ieee80211_ibss_work(sdata);
1164 break;
1165 case NL80211_IFTYPE_MESH_POINT:
1166 if (!ieee80211_vif_is_mesh(&sdata->vif))
1167 break;
1168 ieee80211_mesh_work(sdata);
1169 break;
1170 default:
1171 break;
1172 }
1173 }
1174
1175 static void ieee80211_recalc_smps_work(struct work_struct *work)
1176 {
1177 struct ieee80211_sub_if_data *sdata =
1178 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1179
1180 ieee80211_recalc_smps(sdata);
1181 }
1182
1183 /*
1184 * Helper function to initialise an interface to a specific type.
1185 */
1186 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1187 enum nl80211_iftype type)
1188 {
1189 /* clear type-dependent union */
1190 memset(&sdata->u, 0, sizeof(sdata->u));
1191
1192 /* and set some type-dependent values */
1193 sdata->vif.type = type;
1194 sdata->vif.p2p = false;
1195 sdata->wdev.iftype = type;
1196
1197 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1198 sdata->control_port_no_encrypt = false;
1199
1200 sdata->noack_map = 0;
1201
1202 /* only monitor/p2p-device differ */
1203 if (sdata->dev) {
1204 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1205 sdata->dev->type = ARPHRD_ETHER;
1206 }
1207
1208 skb_queue_head_init(&sdata->skb_queue);
1209 INIT_WORK(&sdata->work, ieee80211_iface_work);
1210 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1211
1212 switch (type) {
1213 case NL80211_IFTYPE_P2P_GO:
1214 type = NL80211_IFTYPE_AP;
1215 sdata->vif.type = type;
1216 sdata->vif.p2p = true;
1217 /* fall through */
1218 case NL80211_IFTYPE_AP:
1219 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1220 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1221 break;
1222 case NL80211_IFTYPE_P2P_CLIENT:
1223 type = NL80211_IFTYPE_STATION;
1224 sdata->vif.type = type;
1225 sdata->vif.p2p = true;
1226 /* fall through */
1227 case NL80211_IFTYPE_STATION:
1228 ieee80211_sta_setup_sdata(sdata);
1229 break;
1230 case NL80211_IFTYPE_ADHOC:
1231 ieee80211_ibss_setup_sdata(sdata);
1232 break;
1233 case NL80211_IFTYPE_MESH_POINT:
1234 if (ieee80211_vif_is_mesh(&sdata->vif))
1235 ieee80211_mesh_init_sdata(sdata);
1236 break;
1237 case NL80211_IFTYPE_MONITOR:
1238 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1239 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1240 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1241 MONITOR_FLAG_OTHER_BSS;
1242 break;
1243 case NL80211_IFTYPE_WDS:
1244 case NL80211_IFTYPE_AP_VLAN:
1245 case NL80211_IFTYPE_P2P_DEVICE:
1246 break;
1247 case NL80211_IFTYPE_UNSPECIFIED:
1248 case NUM_NL80211_IFTYPES:
1249 BUG();
1250 break;
1251 }
1252
1253 ieee80211_debugfs_add_netdev(sdata);
1254 }
1255
1256 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1257 enum nl80211_iftype type)
1258 {
1259 struct ieee80211_local *local = sdata->local;
1260 int ret, err;
1261 enum nl80211_iftype internal_type = type;
1262 bool p2p = false;
1263
1264 ASSERT_RTNL();
1265
1266 if (!local->ops->change_interface)
1267 return -EBUSY;
1268
1269 switch (sdata->vif.type) {
1270 case NL80211_IFTYPE_AP:
1271 case NL80211_IFTYPE_STATION:
1272 case NL80211_IFTYPE_ADHOC:
1273 /*
1274 * Could maybe also all others here?
1275 * Just not sure how that interacts
1276 * with the RX/config path e.g. for
1277 * mesh.
1278 */
1279 break;
1280 default:
1281 return -EBUSY;
1282 }
1283
1284 switch (type) {
1285 case NL80211_IFTYPE_AP:
1286 case NL80211_IFTYPE_STATION:
1287 case NL80211_IFTYPE_ADHOC:
1288 /*
1289 * Could probably support everything
1290 * but WDS here (WDS do_open can fail
1291 * under memory pressure, which this
1292 * code isn't prepared to handle).
1293 */
1294 break;
1295 case NL80211_IFTYPE_P2P_CLIENT:
1296 p2p = true;
1297 internal_type = NL80211_IFTYPE_STATION;
1298 break;
1299 case NL80211_IFTYPE_P2P_GO:
1300 p2p = true;
1301 internal_type = NL80211_IFTYPE_AP;
1302 break;
1303 default:
1304 return -EBUSY;
1305 }
1306
1307 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1308 if (ret)
1309 return ret;
1310
1311 ieee80211_do_stop(sdata, false);
1312
1313 ieee80211_teardown_sdata(sdata);
1314
1315 ret = drv_change_interface(local, sdata, internal_type, p2p);
1316 if (ret)
1317 type = sdata->vif.type;
1318
1319 /*
1320 * Ignore return value here, there's not much we can do since
1321 * the driver changed the interface type internally already.
1322 * The warnings will hopefully make driver authors fix it :-)
1323 */
1324 ieee80211_check_queues(sdata);
1325
1326 ieee80211_setup_sdata(sdata, type);
1327
1328 err = ieee80211_do_open(&sdata->wdev, false);
1329 WARN(err, "type change: do_open returned %d", err);
1330
1331 return ret;
1332 }
1333
1334 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1335 enum nl80211_iftype type)
1336 {
1337 int ret;
1338
1339 ASSERT_RTNL();
1340
1341 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1342 return 0;
1343
1344 if (ieee80211_sdata_running(sdata)) {
1345 ret = ieee80211_runtime_change_iftype(sdata, type);
1346 if (ret)
1347 return ret;
1348 } else {
1349 /* Purge and reset type-dependent state. */
1350 ieee80211_teardown_sdata(sdata);
1351 ieee80211_setup_sdata(sdata, type);
1352 }
1353
1354 /* reset some values that shouldn't be kept across type changes */
1355 sdata->drop_unencrypted = 0;
1356 if (type == NL80211_IFTYPE_STATION)
1357 sdata->u.mgd.use_4addr = false;
1358
1359 return 0;
1360 }
1361
1362 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1363 u8 *perm_addr, enum nl80211_iftype type)
1364 {
1365 struct ieee80211_sub_if_data *sdata;
1366 u64 mask, start, addr, val, inc;
1367 u8 *m;
1368 u8 tmp_addr[ETH_ALEN];
1369 int i;
1370
1371 /* default ... something at least */
1372 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1373
1374 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1375 local->hw.wiphy->n_addresses <= 1)
1376 return;
1377
1378 mutex_lock(&local->iflist_mtx);
1379
1380 switch (type) {
1381 case NL80211_IFTYPE_MONITOR:
1382 /* doesn't matter */
1383 break;
1384 case NL80211_IFTYPE_WDS:
1385 case NL80211_IFTYPE_AP_VLAN:
1386 /* match up with an AP interface */
1387 list_for_each_entry(sdata, &local->interfaces, list) {
1388 if (sdata->vif.type != NL80211_IFTYPE_AP)
1389 continue;
1390 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1391 break;
1392 }
1393 /* keep default if no AP interface present */
1394 break;
1395 case NL80211_IFTYPE_P2P_CLIENT:
1396 case NL80211_IFTYPE_P2P_GO:
1397 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1398 list_for_each_entry(sdata, &local->interfaces, list) {
1399 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1400 continue;
1401 if (!ieee80211_sdata_running(sdata))
1402 continue;
1403 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1404 goto out_unlock;
1405 }
1406 }
1407 /* otherwise fall through */
1408 default:
1409 /* assign a new address if possible -- try n_addresses first */
1410 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1411 bool used = false;
1412
1413 list_for_each_entry(sdata, &local->interfaces, list) {
1414 if (memcmp(local->hw.wiphy->addresses[i].addr,
1415 sdata->vif.addr, ETH_ALEN) == 0) {
1416 used = true;
1417 break;
1418 }
1419 }
1420
1421 if (!used) {
1422 memcpy(perm_addr,
1423 local->hw.wiphy->addresses[i].addr,
1424 ETH_ALEN);
1425 break;
1426 }
1427 }
1428
1429 /* try mask if available */
1430 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1431 break;
1432
1433 m = local->hw.wiphy->addr_mask;
1434 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1435 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1436 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1437
1438 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1439 /* not a contiguous mask ... not handled now! */
1440 pr_info("not contiguous\n");
1441 break;
1442 }
1443
1444 m = local->hw.wiphy->perm_addr;
1445 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1446 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1447 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1448
1449 inc = 1ULL<<__ffs64(mask);
1450 val = (start & mask);
1451 addr = (start & ~mask) | (val & mask);
1452 do {
1453 bool used = false;
1454
1455 tmp_addr[5] = addr >> 0*8;
1456 tmp_addr[4] = addr >> 1*8;
1457 tmp_addr[3] = addr >> 2*8;
1458 tmp_addr[2] = addr >> 3*8;
1459 tmp_addr[1] = addr >> 4*8;
1460 tmp_addr[0] = addr >> 5*8;
1461
1462 val += inc;
1463
1464 list_for_each_entry(sdata, &local->interfaces, list) {
1465 if (memcmp(tmp_addr, sdata->vif.addr,
1466 ETH_ALEN) == 0) {
1467 used = true;
1468 break;
1469 }
1470 }
1471
1472 if (!used) {
1473 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1474 break;
1475 }
1476 addr = (start & ~mask) | (val & mask);
1477 } while (addr != start);
1478
1479 break;
1480 }
1481
1482 out_unlock:
1483 mutex_unlock(&local->iflist_mtx);
1484 }
1485
1486 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1487 {
1488 struct ieee80211_sub_if_data *sdata;
1489
1490 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1491
1492 ieee80211_cleanup_sdata_stas(sdata);
1493 }
1494
1495 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1496 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1497 struct vif_params *params)
1498 {
1499 struct net_device *ndev = NULL;
1500 struct ieee80211_sub_if_data *sdata = NULL;
1501 int ret, i;
1502 int txqs = 1;
1503
1504 ASSERT_RTNL();
1505
1506 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1507 struct wireless_dev *wdev;
1508
1509 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1510 GFP_KERNEL);
1511 if (!sdata)
1512 return -ENOMEM;
1513 wdev = &sdata->wdev;
1514
1515 sdata->dev = NULL;
1516 strlcpy(sdata->name, name, IFNAMSIZ);
1517 ieee80211_assign_perm_addr(local, wdev->address, type);
1518 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1519 } else {
1520 if (local->hw.queues >= IEEE80211_NUM_ACS)
1521 txqs = IEEE80211_NUM_ACS;
1522
1523 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1524 local->hw.vif_data_size,
1525 name, ieee80211_if_setup, txqs, 1);
1526 if (!ndev)
1527 return -ENOMEM;
1528 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1529
1530 ndev->needed_headroom = local->tx_headroom +
1531 4*6 /* four MAC addresses */
1532 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1533 + 6 /* mesh */
1534 + 8 /* rfc1042/bridge tunnel */
1535 - ETH_HLEN /* ethernet hard_header_len */
1536 + IEEE80211_ENCRYPT_HEADROOM;
1537 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1538
1539 ret = dev_alloc_name(ndev, ndev->name);
1540 if (ret < 0) {
1541 free_netdev(ndev);
1542 return ret;
1543 }
1544
1545 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1546 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1547 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1548
1549 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1550 sdata = netdev_priv(ndev);
1551 ndev->ieee80211_ptr = &sdata->wdev;
1552 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1553 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1554
1555 sdata->dev = ndev;
1556 }
1557
1558 /* initialise type-independent data */
1559 sdata->wdev.wiphy = local->hw.wiphy;
1560 sdata->local = local;
1561 #ifdef CONFIG_INET
1562 sdata->arp_filter_state = true;
1563 #endif
1564
1565 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1566 skb_queue_head_init(&sdata->fragments[i].skb_list);
1567
1568 INIT_LIST_HEAD(&sdata->key_list);
1569
1570 spin_lock_init(&sdata->cleanup_stations_lock);
1571 INIT_LIST_HEAD(&sdata->cleanup_stations);
1572 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1573
1574 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1575 struct ieee80211_supported_band *sband;
1576 sband = local->hw.wiphy->bands[i];
1577 sdata->rc_rateidx_mask[i] =
1578 sband ? (1 << sband->n_bitrates) - 1 : 0;
1579 if (sband)
1580 memcpy(sdata->rc_rateidx_mcs_mask[i],
1581 sband->ht_cap.mcs.rx_mask,
1582 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1583 else
1584 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1585 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1586 }
1587
1588 ieee80211_set_default_queues(sdata);
1589
1590 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1591 sdata->user_power_level = local->user_power_level;
1592
1593 /* setup type-dependent data */
1594 ieee80211_setup_sdata(sdata, type);
1595
1596 if (ndev) {
1597 if (params) {
1598 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1599 if (type == NL80211_IFTYPE_STATION)
1600 sdata->u.mgd.use_4addr = params->use_4addr;
1601 }
1602
1603 ndev->features |= local->hw.netdev_features;
1604
1605 ret = register_netdevice(ndev);
1606 if (ret) {
1607 free_netdev(ndev);
1608 return ret;
1609 }
1610 }
1611
1612 mutex_lock(&local->iflist_mtx);
1613 list_add_tail_rcu(&sdata->list, &local->interfaces);
1614 mutex_unlock(&local->iflist_mtx);
1615
1616 if (new_wdev)
1617 *new_wdev = &sdata->wdev;
1618
1619 return 0;
1620 }
1621
1622 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1623 {
1624 ASSERT_RTNL();
1625
1626 mutex_lock(&sdata->local->iflist_mtx);
1627 list_del_rcu(&sdata->list);
1628 mutex_unlock(&sdata->local->iflist_mtx);
1629
1630 synchronize_rcu();
1631
1632 if (sdata->dev) {
1633 unregister_netdevice(sdata->dev);
1634 } else {
1635 cfg80211_unregister_wdev(&sdata->wdev);
1636 kfree(sdata);
1637 }
1638 }
1639
1640 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1641 {
1642 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1643 return;
1644 ieee80211_do_stop(sdata, true);
1645 ieee80211_teardown_sdata(sdata);
1646 }
1647
1648 /*
1649 * Remove all interfaces, may only be called at hardware unregistration
1650 * time because it doesn't do RCU-safe list removals.
1651 */
1652 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1653 {
1654 struct ieee80211_sub_if_data *sdata, *tmp;
1655 LIST_HEAD(unreg_list);
1656 LIST_HEAD(wdev_list);
1657
1658 ASSERT_RTNL();
1659
1660 mutex_lock(&local->iflist_mtx);
1661 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1662 list_del(&sdata->list);
1663
1664 if (sdata->dev)
1665 unregister_netdevice_queue(sdata->dev, &unreg_list);
1666 else
1667 list_add(&sdata->list, &wdev_list);
1668 }
1669 mutex_unlock(&local->iflist_mtx);
1670 unregister_netdevice_many(&unreg_list);
1671 list_del(&unreg_list);
1672
1673 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1674 list_del(&sdata->list);
1675 cfg80211_unregister_wdev(&sdata->wdev);
1676 kfree(sdata);
1677 }
1678 }
1679
1680 static int netdev_notify(struct notifier_block *nb,
1681 unsigned long state,
1682 void *ndev)
1683 {
1684 struct net_device *dev = ndev;
1685 struct ieee80211_sub_if_data *sdata;
1686
1687 if (state != NETDEV_CHANGENAME)
1688 return 0;
1689
1690 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1691 return 0;
1692
1693 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1694 return 0;
1695
1696 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1697
1698 memcpy(sdata->name, dev->name, IFNAMSIZ);
1699
1700 ieee80211_debugfs_rename_netdev(sdata);
1701 return 0;
1702 }
1703
1704 static struct notifier_block mac80211_netdev_notifier = {
1705 .notifier_call = netdev_notify,
1706 };
1707
1708 int ieee80211_iface_init(void)
1709 {
1710 return register_netdevice_notifier(&mac80211_netdev_notifier);
1711 }
1712
1713 void ieee80211_iface_exit(void)
1714 {
1715 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1716 }
Linux 2.6 libata-dev (mirror)