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mac80211: remove IEEE80211_HW_SCAN_WHILE_IDLE
[linux-2.6/btrfs-unstable.git] / net / mac80211 / iface.c
blob3ece8eb6d2df9af6924ee72b21156d52d152a359
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 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
155 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
156
157 list_for_each_entry(sdata, &local->interfaces, list) {
158 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
159 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
160 sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
161 continue;
162 if (sdata->old_idle == sdata->vif.bss_conf.idle)
163 continue;
164 if (!ieee80211_sdata_running(sdata))
165 continue;
166 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
167 }
168
169 if (working || scanning)
170 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
171 else
172 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
173
174 if (count)
175 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
176 else
177 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
178
179 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
180
181 if (working)
182 return ieee80211_idle_off(local, "working");
183 if (scanning)
184 return ieee80211_idle_off(local, "scanning");
185 if (!count)
186 return ieee80211_idle_on(local);
187 else
188 return ieee80211_idle_off(local, "in use");
189
190 return 0;
191 }
192
193 void ieee80211_recalc_idle(struct ieee80211_local *local)
194 {
195 u32 chg;
196
197 mutex_lock(&local->iflist_mtx);
198 chg = __ieee80211_recalc_idle(local);
199 mutex_unlock(&local->iflist_mtx);
200 if (chg)
201 ieee80211_hw_config(local, chg);
202 }
203
204 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
205 {
206 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
207 return -EINVAL;
208
209 dev->mtu = new_mtu;
210 return 0;
211 }
212
213 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
214 {
215 struct ieee80211_sub_if_data *sdata;
216 u64 new, mask, tmp;
217 u8 *m;
218 int ret = 0;
219
220 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
221 return 0;
222
223 m = addr;
224 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
225 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
226 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
227
228 m = local->hw.wiphy->addr_mask;
229 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
230 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
231 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
232
233
234 mutex_lock(&local->iflist_mtx);
235 list_for_each_entry(sdata, &local->interfaces, list) {
236 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
237 continue;
238
239 m = sdata->vif.addr;
240 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
241 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
242 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
243
244 if ((new & ~mask) != (tmp & ~mask)) {
245 ret = -EINVAL;
246 break;
247 }
248 }
249 mutex_unlock(&local->iflist_mtx);
250
251 return ret;
252 }
253
254 static int ieee80211_change_mac(struct net_device *dev, void *addr)
255 {
256 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
257 struct sockaddr *sa = addr;
258 int ret;
259
260 if (ieee80211_sdata_running(sdata))
261 return -EBUSY;
262
263 ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
264 if (ret)
265 return ret;
266
267 ret = eth_mac_addr(dev, sa);
268
269 if (ret == 0)
270 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
271
272 return ret;
273 }
274
275 static inline int identical_mac_addr_allowed(int type1, int type2)
276 {
277 return type1 == NL80211_IFTYPE_MONITOR ||
278 type2 == NL80211_IFTYPE_MONITOR ||
279 type1 == NL80211_IFTYPE_P2P_DEVICE ||
280 type2 == NL80211_IFTYPE_P2P_DEVICE ||
281 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
282 (type1 == NL80211_IFTYPE_WDS &&
283 (type2 == NL80211_IFTYPE_WDS ||
284 type2 == NL80211_IFTYPE_AP)) ||
285 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
286 (type1 == NL80211_IFTYPE_AP_VLAN &&
287 (type2 == NL80211_IFTYPE_AP ||
288 type2 == NL80211_IFTYPE_AP_VLAN));
289 }
290
291 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
292 enum nl80211_iftype iftype)
293 {
294 struct ieee80211_local *local = sdata->local;
295 struct ieee80211_sub_if_data *nsdata;
296
297 ASSERT_RTNL();
298
299 /* we hold the RTNL here so can safely walk the list */
300 list_for_each_entry(nsdata, &local->interfaces, list) {
301 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
302 /*
303 * Allow only a single IBSS interface to be up at any
304 * time. This is restricted because beacon distribution
305 * cannot work properly if both are in the same IBSS.
306 *
307 * To remove this restriction we'd have to disallow them
308 * from setting the same SSID on different IBSS interfaces
309 * belonging to the same hardware. Then, however, we're
310 * faced with having to adopt two different TSF timers...
311 */
312 if (iftype == NL80211_IFTYPE_ADHOC &&
313 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
314 return -EBUSY;
315
316 /*
317 * The remaining checks are only performed for interfaces
318 * with the same MAC address.
319 */
320 if (!ether_addr_equal(sdata->vif.addr,
321 nsdata->vif.addr))
322 continue;
323
324 /*
325 * check whether it may have the same address
326 */
327 if (!identical_mac_addr_allowed(iftype,
328 nsdata->vif.type))
329 return -ENOTUNIQ;
330
331 /*
332 * can only add VLANs to enabled APs
333 */
334 if (iftype == NL80211_IFTYPE_AP_VLAN &&
335 nsdata->vif.type == NL80211_IFTYPE_AP)
336 sdata->bss = &nsdata->u.ap;
337 }
338 }
339
340 return 0;
341 }
342
343 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
344 {
345 int n_queues = sdata->local->hw.queues;
346 int i;
347
348 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
349 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
350 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
351 IEEE80211_INVAL_HW_QUEUE))
352 return -EINVAL;
353 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
354 n_queues))
355 return -EINVAL;
356 }
357 }
358
359 if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
360 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
361 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
362 return 0;
363 }
364
365 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
366 return -EINVAL;
367
368 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
369 return -EINVAL;
370
371 return 0;
372 }
373
374 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
375 const int offset)
376 {
377 struct ieee80211_local *local = sdata->local;
378 u32 flags = sdata->u.mntr_flags;
379
380 #define ADJUST(_f, _s) do { \
381 if (flags & MONITOR_FLAG_##_f) \
382 local->fif_##_s += offset; \
383 } while (0)
384
385 ADJUST(FCSFAIL, fcsfail);
386 ADJUST(PLCPFAIL, plcpfail);
387 ADJUST(CONTROL, control);
388 ADJUST(CONTROL, pspoll);
389 ADJUST(OTHER_BSS, other_bss);
390
391 #undef ADJUST
392 }
393
394 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
395 {
396 struct ieee80211_local *local = sdata->local;
397 int i;
398
399 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
400 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
401 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
402 else if (local->hw.queues >= IEEE80211_NUM_ACS)
403 sdata->vif.hw_queue[i] = i;
404 else
405 sdata->vif.hw_queue[i] = 0;
406 }
407 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
408 }
409
410 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
411 {
412 struct ieee80211_sub_if_data *sdata;
413 int ret = 0;
414
415 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
416 return 0;
417
418 mutex_lock(&local->iflist_mtx);
419
420 if (local->monitor_sdata)
421 goto out_unlock;
422
423 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
424 if (!sdata) {
425 ret = -ENOMEM;
426 goto out_unlock;
427 }
428
429 /* set up data */
430 sdata->local = local;
431 sdata->vif.type = NL80211_IFTYPE_MONITOR;
432 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
433 wiphy_name(local->hw.wiphy));
434
435 ieee80211_set_default_queues(sdata);
436
437 ret = drv_add_interface(local, sdata);
438 if (WARN_ON(ret)) {
439 /* ok .. stupid driver, it asked for this! */
440 kfree(sdata);
441 goto out_unlock;
442 }
443
444 ret = ieee80211_check_queues(sdata);
445 if (ret) {
446 kfree(sdata);
447 goto out_unlock;
448 }
449
450 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
451 IEEE80211_CHANCTX_EXCLUSIVE);
452 if (ret) {
453 drv_remove_interface(local, sdata);
454 kfree(sdata);
455 goto out_unlock;
456 }
457
458 rcu_assign_pointer(local->monitor_sdata, sdata);
459 out_unlock:
460 mutex_unlock(&local->iflist_mtx);
461 return ret;
462 }
463
464 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
465 {
466 struct ieee80211_sub_if_data *sdata;
467
468 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
469 return;
470
471 mutex_lock(&local->iflist_mtx);
472
473 sdata = rcu_dereference_protected(local->monitor_sdata,
474 lockdep_is_held(&local->iflist_mtx));
475 if (!sdata)
476 goto out_unlock;
477
478 rcu_assign_pointer(local->monitor_sdata, NULL);
479 synchronize_net();
480
481 ieee80211_vif_release_channel(sdata);
482
483 drv_remove_interface(local, sdata);
484
485 kfree(sdata);
486 out_unlock:
487 mutex_unlock(&local->iflist_mtx);
488 }
489
490 /*
491 * NOTE: Be very careful when changing this function, it must NOT return
492 * an error on interface type changes that have been pre-checked, so most
493 * checks should be in ieee80211_check_concurrent_iface.
494 */
495 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
496 {
497 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
498 struct net_device *dev = wdev->netdev;
499 struct ieee80211_local *local = sdata->local;
500 struct sta_info *sta;
501 u32 changed = 0;
502 int res;
503 u32 hw_reconf_flags = 0;
504
505 switch (sdata->vif.type) {
506 case NL80211_IFTYPE_WDS:
507 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
508 return -ENOLINK;
509 break;
510 case NL80211_IFTYPE_AP_VLAN: {
511 struct ieee80211_sub_if_data *master;
512
513 if (!sdata->bss)
514 return -ENOLINK;
515
516 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
517
518 master = container_of(sdata->bss,
519 struct ieee80211_sub_if_data, u.ap);
520 sdata->control_port_protocol =
521 master->control_port_protocol;
522 sdata->control_port_no_encrypt =
523 master->control_port_no_encrypt;
524 break;
525 }
526 case NL80211_IFTYPE_AP:
527 sdata->bss = &sdata->u.ap;
528 break;
529 case NL80211_IFTYPE_MESH_POINT:
530 case NL80211_IFTYPE_STATION:
531 case NL80211_IFTYPE_MONITOR:
532 case NL80211_IFTYPE_ADHOC:
533 case NL80211_IFTYPE_P2P_DEVICE:
534 /* no special treatment */
535 break;
536 case NL80211_IFTYPE_UNSPECIFIED:
537 case NUM_NL80211_IFTYPES:
538 case NL80211_IFTYPE_P2P_CLIENT:
539 case NL80211_IFTYPE_P2P_GO:
540 /* cannot happen */
541 WARN_ON(1);
542 break;
543 }
544
545 if (local->open_count == 0) {
546 res = drv_start(local);
547 if (res)
548 goto err_del_bss;
549 if (local->ops->napi_poll)
550 napi_enable(&local->napi);
551 /* we're brought up, everything changes */
552 hw_reconf_flags = ~0;
553 ieee80211_led_radio(local, true);
554 ieee80211_mod_tpt_led_trig(local,
555 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
556 }
557
558 /*
559 * Copy the hopefully now-present MAC address to
560 * this interface, if it has the special null one.
561 */
562 if (dev && is_zero_ether_addr(dev->dev_addr)) {
563 memcpy(dev->dev_addr,
564 local->hw.wiphy->perm_addr,
565 ETH_ALEN);
566 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
567
568 if (!is_valid_ether_addr(dev->dev_addr)) {
569 res = -EADDRNOTAVAIL;
570 goto err_stop;
571 }
572 }
573
574 switch (sdata->vif.type) {
575 case NL80211_IFTYPE_AP_VLAN:
576 /* no need to tell driver, but set carrier and chanctx */
577 if (rtnl_dereference(sdata->bss->beacon)) {
578 ieee80211_vif_vlan_copy_chanctx(sdata);
579 netif_carrier_on(dev);
580 } else {
581 netif_carrier_off(dev);
582 }
583 break;
584 case NL80211_IFTYPE_MONITOR:
585 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
586 local->cooked_mntrs++;
587 break;
588 }
589
590 if (local->monitors == 0 && local->open_count == 0) {
591 res = ieee80211_add_virtual_monitor(local);
592 if (res)
593 goto err_stop;
594 }
595
596 /* must be before the call to ieee80211_configure_filter */
597 local->monitors++;
598 if (local->monitors == 1) {
599 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
600 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
601 }
602
603 ieee80211_adjust_monitor_flags(sdata, 1);
604 ieee80211_configure_filter(local);
605
606 netif_carrier_on(dev);
607 break;
608 default:
609 if (coming_up) {
610 ieee80211_del_virtual_monitor(local);
611
612 res = drv_add_interface(local, sdata);
613 if (res)
614 goto err_stop;
615 res = ieee80211_check_queues(sdata);
616 if (res)
617 goto err_del_interface;
618 }
619
620 drv_add_interface_debugfs(local, sdata);
621
622 if (sdata->vif.type == NL80211_IFTYPE_AP) {
623 local->fif_pspoll++;
624 local->fif_probe_req++;
625
626 ieee80211_configure_filter(local);
627 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
628 local->fif_probe_req++;
629 }
630
631 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
632 changed |= ieee80211_reset_erp_info(sdata);
633 ieee80211_bss_info_change_notify(sdata, changed);
634
635 switch (sdata->vif.type) {
636 case NL80211_IFTYPE_STATION:
637 case NL80211_IFTYPE_ADHOC:
638 case NL80211_IFTYPE_AP:
639 case NL80211_IFTYPE_MESH_POINT:
640 netif_carrier_off(dev);
641 break;
642 case NL80211_IFTYPE_WDS:
643 case NL80211_IFTYPE_P2P_DEVICE:
644 break;
645 default:
646 netif_carrier_on(dev);
647 }
648
649 /*
650 * set default queue parameters so drivers don't
651 * need to initialise the hardware if the hardware
652 * doesn't start up with sane defaults
653 */
654 ieee80211_set_wmm_default(sdata, true);
655 }
656
657 set_bit(SDATA_STATE_RUNNING, &sdata->state);
658
659 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
660 /* Create STA entry for the WDS peer */
661 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
662 GFP_KERNEL);
663 if (!sta) {
664 res = -ENOMEM;
665 goto err_del_interface;
666 }
667
668 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
669 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
670 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
671
672 res = sta_info_insert(sta);
673 if (res) {
674 /* STA has been freed */
675 goto err_del_interface;
676 }
677
678 rate_control_rate_init(sta);
679 netif_carrier_on(dev);
680 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
681 rcu_assign_pointer(local->p2p_sdata, sdata);
682 }
683
684 /*
685 * set_multicast_list will be invoked by the networking core
686 * which will check whether any increments here were done in
687 * error and sync them down to the hardware as filter flags.
688 */
689 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
690 atomic_inc(&local->iff_allmultis);
691
692 if (sdata->flags & IEEE80211_SDATA_PROMISC)
693 atomic_inc(&local->iff_promiscs);
694
695 mutex_lock(&local->mtx);
696 hw_reconf_flags |= __ieee80211_recalc_idle(local);
697 mutex_unlock(&local->mtx);
698
699 if (coming_up)
700 local->open_count++;
701
702 if (hw_reconf_flags)
703 ieee80211_hw_config(local, hw_reconf_flags);
704
705 ieee80211_recalc_ps(local, -1);
706
707 if (dev)
708 netif_tx_start_all_queues(dev);
709
710 return 0;
711 err_del_interface:
712 drv_remove_interface(local, sdata);
713 err_stop:
714 if (!local->open_count)
715 drv_stop(local);
716 err_del_bss:
717 sdata->bss = NULL;
718 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
719 list_del(&sdata->u.vlan.list);
720 /* might already be clear but that doesn't matter */
721 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
722 return res;
723 }
724
725 static int ieee80211_open(struct net_device *dev)
726 {
727 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
728 int err;
729
730 /* fail early if user set an invalid address */
731 if (!is_valid_ether_addr(dev->dev_addr))
732 return -EADDRNOTAVAIL;
733
734 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
735 if (err)
736 return err;
737
738 return ieee80211_do_open(&sdata->wdev, true);
739 }
740
741 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
742 bool going_down)
743 {
744 struct ieee80211_local *local = sdata->local;
745 unsigned long flags;
746 struct sk_buff *skb, *tmp;
747 u32 hw_reconf_flags = 0;
748 int i, flushed;
749
750 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
751
752 if (rcu_access_pointer(local->scan_sdata) == sdata)
753 ieee80211_scan_cancel(local);
754
755 /*
756 * Stop TX on this interface first.
757 */
758 if (sdata->dev)
759 netif_tx_stop_all_queues(sdata->dev);
760
761 ieee80211_roc_purge(sdata);
762
763 /*
764 * Remove all stations associated with this interface.
765 *
766 * This must be done before calling ops->remove_interface()
767 * because otherwise we can later invoke ops->sta_notify()
768 * whenever the STAs are removed, and that invalidates driver
769 * assumptions about always getting a vif pointer that is valid
770 * (because if we remove a STA after ops->remove_interface()
771 * the driver will have removed the vif info already!)
772 *
773 * This is relevant only in WDS mode, in all other modes we've
774 * already removed all stations when disconnecting or similar,
775 * so warn otherwise.
776 *
777 * We call sta_info_flush_cleanup() later, to combine RCU waits.
778 */
779 flushed = sta_info_flush_defer(sdata);
780 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
781 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
782
783 /*
784 * Don't count this interface for promisc/allmulti while it
785 * is down. dev_mc_unsync() will invoke set_multicast_list
786 * on the master interface which will sync these down to the
787 * hardware as filter flags.
788 */
789 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
790 atomic_dec(&local->iff_allmultis);
791
792 if (sdata->flags & IEEE80211_SDATA_PROMISC)
793 atomic_dec(&local->iff_promiscs);
794
795 if (sdata->vif.type == NL80211_IFTYPE_AP) {
796 local->fif_pspoll--;
797 local->fif_probe_req--;
798 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
799 local->fif_probe_req--;
800 }
801
802 if (sdata->dev) {
803 netif_addr_lock_bh(sdata->dev);
804 spin_lock_bh(&local->filter_lock);
805 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
806 sdata->dev->addr_len);
807 spin_unlock_bh(&local->filter_lock);
808 netif_addr_unlock_bh(sdata->dev);
809
810 ieee80211_configure_filter(local);
811 }
812
813 del_timer_sync(&local->dynamic_ps_timer);
814 cancel_work_sync(&local->dynamic_ps_enable_work);
815
816 cancel_work_sync(&sdata->recalc_smps);
817
818 /* APs need special treatment */
819 if (sdata->vif.type == NL80211_IFTYPE_AP) {
820 struct ieee80211_sub_if_data *vlan, *tmpsdata;
821
822 /* down all dependent devices, that is VLANs */
823 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
824 u.vlan.list)
825 dev_close(vlan->dev);
826 WARN_ON(!list_empty(&sdata->u.ap.vlans));
827 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
828 ieee80211_mgd_stop(sdata);
829 }
830
831 if (going_down)
832 local->open_count--;
833
834 switch (sdata->vif.type) {
835 case NL80211_IFTYPE_AP_VLAN:
836 list_del(&sdata->u.vlan.list);
837 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
838 /* no need to tell driver */
839 break;
840 case NL80211_IFTYPE_MONITOR:
841 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
842 local->cooked_mntrs--;
843 break;
844 }
845
846 local->monitors--;
847 if (local->monitors == 0) {
848 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
849 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
850 ieee80211_del_virtual_monitor(local);
851 }
852
853 ieee80211_adjust_monitor_flags(sdata, -1);
854 ieee80211_configure_filter(local);
855 break;
856 case NL80211_IFTYPE_P2P_DEVICE:
857 /* relies on synchronize_rcu() below */
858 rcu_assign_pointer(local->p2p_sdata, NULL);
859 /* fall through */
860 default:
861 cancel_work_sync(&sdata->work);
862 /*
863 * When we get here, the interface is marked down.
864 *
865 * sta_info_flush_cleanup() requires rcu_barrier()
866 * first to wait for the station call_rcu() calls
867 * to complete, here we need at least sychronize_rcu()
868 * it to wait for the RX path in case it is using the
869 * interface and enqueuing frames at this very time on
870 * another CPU.
871 */
872 rcu_barrier();
873 sta_info_flush_cleanup(sdata);
874
875 skb_queue_purge(&sdata->skb_queue);
876
877 /*
878 * Free all remaining keys, there shouldn't be any,
879 * except maybe group keys in AP more or WDS?
880 */
881 ieee80211_free_keys(sdata);
882
883 drv_remove_interface_debugfs(local, sdata);
884
885 if (going_down)
886 drv_remove_interface(local, sdata);
887 }
888
889 sdata->bss = NULL;
890
891 mutex_lock(&local->mtx);
892 hw_reconf_flags |= __ieee80211_recalc_idle(local);
893 mutex_unlock(&local->mtx);
894
895 ieee80211_recalc_ps(local, -1);
896
897 if (local->open_count == 0) {
898 if (local->ops->napi_poll)
899 napi_disable(&local->napi);
900 ieee80211_clear_tx_pending(local);
901 ieee80211_stop_device(local);
902
903 /* no reconfiguring after stop! */
904 hw_reconf_flags = 0;
905 }
906
907 /* do after stop to avoid reconfiguring when we stop anyway */
908 if (hw_reconf_flags)
909 ieee80211_hw_config(local, hw_reconf_flags);
910
911 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
912 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
913 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
915 if (info->control.vif == &sdata->vif) {
916 __skb_unlink(skb, &local->pending[i]);
917 ieee80211_free_txskb(&local->hw, skb);
918 }
919 }
920 }
921 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
922
923 if (local->monitors == local->open_count && local->monitors > 0)
924 ieee80211_add_virtual_monitor(local);
925 }
926
927 static int ieee80211_stop(struct net_device *dev)
928 {
929 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
930
931 ieee80211_do_stop(sdata, true);
932
933 return 0;
934 }
935
936 static void ieee80211_set_multicast_list(struct net_device *dev)
937 {
938 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
939 struct ieee80211_local *local = sdata->local;
940 int allmulti, promisc, sdata_allmulti, sdata_promisc;
941
942 allmulti = !!(dev->flags & IFF_ALLMULTI);
943 promisc = !!(dev->flags & IFF_PROMISC);
944 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
945 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
946
947 if (allmulti != sdata_allmulti) {
948 if (dev->flags & IFF_ALLMULTI)
949 atomic_inc(&local->iff_allmultis);
950 else
951 atomic_dec(&local->iff_allmultis);
952 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
953 }
954
955 if (promisc != sdata_promisc) {
956 if (dev->flags & IFF_PROMISC)
957 atomic_inc(&local->iff_promiscs);
958 else
959 atomic_dec(&local->iff_promiscs);
960 sdata->flags ^= IEEE80211_SDATA_PROMISC;
961 }
962 spin_lock_bh(&local->filter_lock);
963 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
964 spin_unlock_bh(&local->filter_lock);
965 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
966 }
967
968 /*
969 * Called when the netdev is removed or, by the code below, before
970 * the interface type changes.
971 */
972 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
973 {
974 int flushed;
975 int i;
976
977 /* free extra data */
978 ieee80211_free_keys(sdata);
979
980 ieee80211_debugfs_remove_netdev(sdata);
981
982 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
983 __skb_queue_purge(&sdata->fragments[i].skb_list);
984 sdata->fragment_next = 0;
985
986 if (ieee80211_vif_is_mesh(&sdata->vif))
987 mesh_rmc_free(sdata);
988
989 flushed = sta_info_flush(sdata);
990 WARN_ON(flushed);
991 }
992
993 static void ieee80211_uninit(struct net_device *dev)
994 {
995 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
996 }
997
998 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
999 struct sk_buff *skb)
1000 {
1001 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1002 }
1003
1004 static const struct net_device_ops ieee80211_dataif_ops = {
1005 .ndo_open = ieee80211_open,
1006 .ndo_stop = ieee80211_stop,
1007 .ndo_uninit = ieee80211_uninit,
1008 .ndo_start_xmit = ieee80211_subif_start_xmit,
1009 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1010 .ndo_change_mtu = ieee80211_change_mtu,
1011 .ndo_set_mac_address = ieee80211_change_mac,
1012 .ndo_select_queue = ieee80211_netdev_select_queue,
1013 };
1014
1015 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1016 struct sk_buff *skb)
1017 {
1018 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1019 struct ieee80211_local *local = sdata->local;
1020 struct ieee80211_hdr *hdr;
1021 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1022
1023 if (local->hw.queues < IEEE80211_NUM_ACS)
1024 return 0;
1025
1026 if (skb->len < 4 ||
1027 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1028 return 0; /* doesn't matter, frame will be dropped */
1029
1030 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1031
1032 return ieee80211_select_queue_80211(sdata, skb, hdr);
1033 }
1034
1035 static const struct net_device_ops ieee80211_monitorif_ops = {
1036 .ndo_open = ieee80211_open,
1037 .ndo_stop = ieee80211_stop,
1038 .ndo_uninit = ieee80211_uninit,
1039 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1040 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1041 .ndo_change_mtu = ieee80211_change_mtu,
1042 .ndo_set_mac_address = eth_mac_addr,
1043 .ndo_select_queue = ieee80211_monitor_select_queue,
1044 };
1045
1046 static void ieee80211_if_setup(struct net_device *dev)
1047 {
1048 ether_setup(dev);
1049 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1050 dev->netdev_ops = &ieee80211_dataif_ops;
1051 dev->destructor = free_netdev;
1052 }
1053
1054 static void ieee80211_iface_work(struct work_struct *work)
1055 {
1056 struct ieee80211_sub_if_data *sdata =
1057 container_of(work, struct ieee80211_sub_if_data, work);
1058 struct ieee80211_local *local = sdata->local;
1059 struct sk_buff *skb;
1060 struct sta_info *sta;
1061 struct ieee80211_ra_tid *ra_tid;
1062
1063 if (!ieee80211_sdata_running(sdata))
1064 return;
1065
1066 if (local->scanning)
1067 return;
1068
1069 /*
1070 * ieee80211_queue_work() should have picked up most cases,
1071 * here we'll pick the rest.
1072 */
1073 if (WARN(local->suspended,
1074 "interface work scheduled while going to suspend\n"))
1075 return;
1076
1077 /* first process frames */
1078 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1079 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1080
1081 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1082 ra_tid = (void *)&skb->cb;
1083 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1084 ra_tid->tid);
1085 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1086 ra_tid = (void *)&skb->cb;
1087 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1088 ra_tid->tid);
1089 } else if (ieee80211_is_action(mgmt->frame_control) &&
1090 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1091 int len = skb->len;
1092
1093 mutex_lock(&local->sta_mtx);
1094 sta = sta_info_get_bss(sdata, mgmt->sa);
1095 if (sta) {
1096 switch (mgmt->u.action.u.addba_req.action_code) {
1097 case WLAN_ACTION_ADDBA_REQ:
1098 ieee80211_process_addba_request(
1099 local, sta, mgmt, len);
1100 break;
1101 case WLAN_ACTION_ADDBA_RESP:
1102 ieee80211_process_addba_resp(local, sta,
1103 mgmt, len);
1104 break;
1105 case WLAN_ACTION_DELBA:
1106 ieee80211_process_delba(sdata, sta,
1107 mgmt, len);
1108 break;
1109 default:
1110 WARN_ON(1);
1111 break;
1112 }
1113 }
1114 mutex_unlock(&local->sta_mtx);
1115 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1116 struct ieee80211_hdr *hdr = (void *)mgmt;
1117 /*
1118 * So the frame isn't mgmt, but frame_control
1119 * is at the right place anyway, of course, so
1120 * the if statement is correct.
1121 *
1122 * Warn if we have other data frame types here,
1123 * they must not get here.
1124 */
1125 WARN_ON(hdr->frame_control &
1126 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1127 WARN_ON(!(hdr->seq_ctrl &
1128 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1129 /*
1130 * This was a fragment of a frame, received while
1131 * a block-ack session was active. That cannot be
1132 * right, so terminate the session.
1133 */
1134 mutex_lock(&local->sta_mtx);
1135 sta = sta_info_get_bss(sdata, mgmt->sa);
1136 if (sta) {
1137 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1138 IEEE80211_QOS_CTL_TID_MASK;
1139
1140 __ieee80211_stop_rx_ba_session(
1141 sta, tid, WLAN_BACK_RECIPIENT,
1142 WLAN_REASON_QSTA_REQUIRE_SETUP,
1143 true);
1144 }
1145 mutex_unlock(&local->sta_mtx);
1146 } else switch (sdata->vif.type) {
1147 case NL80211_IFTYPE_STATION:
1148 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1149 break;
1150 case NL80211_IFTYPE_ADHOC:
1151 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1152 break;
1153 case NL80211_IFTYPE_MESH_POINT:
1154 if (!ieee80211_vif_is_mesh(&sdata->vif))
1155 break;
1156 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1157 break;
1158 default:
1159 WARN(1, "frame for unexpected interface type");
1160 break;
1161 }
1162
1163 kfree_skb(skb);
1164 }
1165
1166 /* then other type-dependent work */
1167 switch (sdata->vif.type) {
1168 case NL80211_IFTYPE_STATION:
1169 ieee80211_sta_work(sdata);
1170 break;
1171 case NL80211_IFTYPE_ADHOC:
1172 ieee80211_ibss_work(sdata);
1173 break;
1174 case NL80211_IFTYPE_MESH_POINT:
1175 if (!ieee80211_vif_is_mesh(&sdata->vif))
1176 break;
1177 ieee80211_mesh_work(sdata);
1178 break;
1179 default:
1180 break;
1181 }
1182 }
1183
1184 static void ieee80211_recalc_smps_work(struct work_struct *work)
1185 {
1186 struct ieee80211_sub_if_data *sdata =
1187 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1188
1189 ieee80211_recalc_smps(sdata);
1190 }
1191
1192 /*
1193 * Helper function to initialise an interface to a specific type.
1194 */
1195 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1196 enum nl80211_iftype type)
1197 {
1198 /* clear type-dependent union */
1199 memset(&sdata->u, 0, sizeof(sdata->u));
1200
1201 /* and set some type-dependent values */
1202 sdata->vif.type = type;
1203 sdata->vif.p2p = false;
1204 sdata->wdev.iftype = type;
1205
1206 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1207 sdata->control_port_no_encrypt = false;
1208
1209 sdata->noack_map = 0;
1210
1211 /* only monitor/p2p-device differ */
1212 if (sdata->dev) {
1213 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1214 sdata->dev->type = ARPHRD_ETHER;
1215 }
1216
1217 skb_queue_head_init(&sdata->skb_queue);
1218 INIT_WORK(&sdata->work, ieee80211_iface_work);
1219 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1220
1221 switch (type) {
1222 case NL80211_IFTYPE_P2P_GO:
1223 type = NL80211_IFTYPE_AP;
1224 sdata->vif.type = type;
1225 sdata->vif.p2p = true;
1226 /* fall through */
1227 case NL80211_IFTYPE_AP:
1228 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1229 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1230 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1231 break;
1232 case NL80211_IFTYPE_P2P_CLIENT:
1233 type = NL80211_IFTYPE_STATION;
1234 sdata->vif.type = type;
1235 sdata->vif.p2p = true;
1236 /* fall through */
1237 case NL80211_IFTYPE_STATION:
1238 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1239 ieee80211_sta_setup_sdata(sdata);
1240 break;
1241 case NL80211_IFTYPE_ADHOC:
1242 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1243 ieee80211_ibss_setup_sdata(sdata);
1244 break;
1245 case NL80211_IFTYPE_MESH_POINT:
1246 if (ieee80211_vif_is_mesh(&sdata->vif))
1247 ieee80211_mesh_init_sdata(sdata);
1248 break;
1249 case NL80211_IFTYPE_MONITOR:
1250 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1251 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1252 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1253 MONITOR_FLAG_OTHER_BSS;
1254 break;
1255 case NL80211_IFTYPE_WDS:
1256 sdata->vif.bss_conf.bssid = NULL;
1257 break;
1258 case NL80211_IFTYPE_AP_VLAN:
1259 break;
1260 case NL80211_IFTYPE_P2P_DEVICE:
1261 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1262 break;
1263 case NL80211_IFTYPE_UNSPECIFIED:
1264 case NUM_NL80211_IFTYPES:
1265 BUG();
1266 break;
1267 }
1268
1269 ieee80211_debugfs_add_netdev(sdata);
1270 }
1271
1272 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1273 enum nl80211_iftype type)
1274 {
1275 struct ieee80211_local *local = sdata->local;
1276 int ret, err;
1277 enum nl80211_iftype internal_type = type;
1278 bool p2p = false;
1279
1280 ASSERT_RTNL();
1281
1282 if (!local->ops->change_interface)
1283 return -EBUSY;
1284
1285 switch (sdata->vif.type) {
1286 case NL80211_IFTYPE_AP:
1287 case NL80211_IFTYPE_STATION:
1288 case NL80211_IFTYPE_ADHOC:
1289 /*
1290 * Could maybe also all others here?
1291 * Just not sure how that interacts
1292 * with the RX/config path e.g. for
1293 * mesh.
1294 */
1295 break;
1296 default:
1297 return -EBUSY;
1298 }
1299
1300 switch (type) {
1301 case NL80211_IFTYPE_AP:
1302 case NL80211_IFTYPE_STATION:
1303 case NL80211_IFTYPE_ADHOC:
1304 /*
1305 * Could probably support everything
1306 * but WDS here (WDS do_open can fail
1307 * under memory pressure, which this
1308 * code isn't prepared to handle).
1309 */
1310 break;
1311 case NL80211_IFTYPE_P2P_CLIENT:
1312 p2p = true;
1313 internal_type = NL80211_IFTYPE_STATION;
1314 break;
1315 case NL80211_IFTYPE_P2P_GO:
1316 p2p = true;
1317 internal_type = NL80211_IFTYPE_AP;
1318 break;
1319 default:
1320 return -EBUSY;
1321 }
1322
1323 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1324 if (ret)
1325 return ret;
1326
1327 ieee80211_do_stop(sdata, false);
1328
1329 ieee80211_teardown_sdata(sdata);
1330
1331 ret = drv_change_interface(local, sdata, internal_type, p2p);
1332 if (ret)
1333 type = sdata->vif.type;
1334
1335 /*
1336 * Ignore return value here, there's not much we can do since
1337 * the driver changed the interface type internally already.
1338 * The warnings will hopefully make driver authors fix it :-)
1339 */
1340 ieee80211_check_queues(sdata);
1341
1342 ieee80211_setup_sdata(sdata, type);
1343
1344 err = ieee80211_do_open(&sdata->wdev, false);
1345 WARN(err, "type change: do_open returned %d", err);
1346
1347 return ret;
1348 }
1349
1350 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1351 enum nl80211_iftype type)
1352 {
1353 int ret;
1354
1355 ASSERT_RTNL();
1356
1357 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1358 return 0;
1359
1360 if (ieee80211_sdata_running(sdata)) {
1361 ret = ieee80211_runtime_change_iftype(sdata, type);
1362 if (ret)
1363 return ret;
1364 } else {
1365 /* Purge and reset type-dependent state. */
1366 ieee80211_teardown_sdata(sdata);
1367 ieee80211_setup_sdata(sdata, type);
1368 }
1369
1370 /* reset some values that shouldn't be kept across type changes */
1371 sdata->drop_unencrypted = 0;
1372 if (type == NL80211_IFTYPE_STATION)
1373 sdata->u.mgd.use_4addr = false;
1374
1375 return 0;
1376 }
1377
1378 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1379 u8 *perm_addr, enum nl80211_iftype type)
1380 {
1381 struct ieee80211_sub_if_data *sdata;
1382 u64 mask, start, addr, val, inc;
1383 u8 *m;
1384 u8 tmp_addr[ETH_ALEN];
1385 int i;
1386
1387 /* default ... something at least */
1388 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1389
1390 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1391 local->hw.wiphy->n_addresses <= 1)
1392 return;
1393
1394 mutex_lock(&local->iflist_mtx);
1395
1396 switch (type) {
1397 case NL80211_IFTYPE_MONITOR:
1398 /* doesn't matter */
1399 break;
1400 case NL80211_IFTYPE_WDS:
1401 case NL80211_IFTYPE_AP_VLAN:
1402 /* match up with an AP interface */
1403 list_for_each_entry(sdata, &local->interfaces, list) {
1404 if (sdata->vif.type != NL80211_IFTYPE_AP)
1405 continue;
1406 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1407 break;
1408 }
1409 /* keep default if no AP interface present */
1410 break;
1411 case NL80211_IFTYPE_P2P_CLIENT:
1412 case NL80211_IFTYPE_P2P_GO:
1413 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1414 list_for_each_entry(sdata, &local->interfaces, list) {
1415 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1416 continue;
1417 if (!ieee80211_sdata_running(sdata))
1418 continue;
1419 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1420 goto out_unlock;
1421 }
1422 }
1423 /* otherwise fall through */
1424 default:
1425 /* assign a new address if possible -- try n_addresses first */
1426 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1427 bool used = false;
1428
1429 list_for_each_entry(sdata, &local->interfaces, list) {
1430 if (memcmp(local->hw.wiphy->addresses[i].addr,
1431 sdata->vif.addr, ETH_ALEN) == 0) {
1432 used = true;
1433 break;
1434 }
1435 }
1436
1437 if (!used) {
1438 memcpy(perm_addr,
1439 local->hw.wiphy->addresses[i].addr,
1440 ETH_ALEN);
1441 break;
1442 }
1443 }
1444
1445 /* try mask if available */
1446 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1447 break;
1448
1449 m = local->hw.wiphy->addr_mask;
1450 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1451 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1452 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1453
1454 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1455 /* not a contiguous mask ... not handled now! */
1456 pr_info("not contiguous\n");
1457 break;
1458 }
1459
1460 m = local->hw.wiphy->perm_addr;
1461 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1462 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1463 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1464
1465 inc = 1ULL<<__ffs64(mask);
1466 val = (start & mask);
1467 addr = (start & ~mask) | (val & mask);
1468 do {
1469 bool used = false;
1470
1471 tmp_addr[5] = addr >> 0*8;
1472 tmp_addr[4] = addr >> 1*8;
1473 tmp_addr[3] = addr >> 2*8;
1474 tmp_addr[2] = addr >> 3*8;
1475 tmp_addr[1] = addr >> 4*8;
1476 tmp_addr[0] = addr >> 5*8;
1477
1478 val += inc;
1479
1480 list_for_each_entry(sdata, &local->interfaces, list) {
1481 if (memcmp(tmp_addr, sdata->vif.addr,
1482 ETH_ALEN) == 0) {
1483 used = true;
1484 break;
1485 }
1486 }
1487
1488 if (!used) {
1489 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1490 break;
1491 }
1492 addr = (start & ~mask) | (val & mask);
1493 } while (addr != start);
1494
1495 break;
1496 }
1497
1498 out_unlock:
1499 mutex_unlock(&local->iflist_mtx);
1500 }
1501
1502 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1503 {
1504 struct ieee80211_sub_if_data *sdata;
1505
1506 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1507
1508 ieee80211_cleanup_sdata_stas(sdata);
1509 }
1510
1511 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1512 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1513 struct vif_params *params)
1514 {
1515 struct net_device *ndev = NULL;
1516 struct ieee80211_sub_if_data *sdata = NULL;
1517 int ret, i;
1518 int txqs = 1;
1519
1520 ASSERT_RTNL();
1521
1522 if (type == NL80211_IFTYPE_P2P_DEVICE) {
1523 struct wireless_dev *wdev;
1524
1525 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1526 GFP_KERNEL);
1527 if (!sdata)
1528 return -ENOMEM;
1529 wdev = &sdata->wdev;
1530
1531 sdata->dev = NULL;
1532 strlcpy(sdata->name, name, IFNAMSIZ);
1533 ieee80211_assign_perm_addr(local, wdev->address, type);
1534 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1535 } else {
1536 if (local->hw.queues >= IEEE80211_NUM_ACS)
1537 txqs = IEEE80211_NUM_ACS;
1538
1539 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1540 local->hw.vif_data_size,
1541 name, ieee80211_if_setup, txqs, 1);
1542 if (!ndev)
1543 return -ENOMEM;
1544 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1545
1546 ndev->needed_headroom = local->tx_headroom +
1547 4*6 /* four MAC addresses */
1548 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1549 + 6 /* mesh */
1550 + 8 /* rfc1042/bridge tunnel */
1551 - ETH_HLEN /* ethernet hard_header_len */
1552 + IEEE80211_ENCRYPT_HEADROOM;
1553 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1554
1555 ret = dev_alloc_name(ndev, ndev->name);
1556 if (ret < 0) {
1557 free_netdev(ndev);
1558 return ret;
1559 }
1560
1561 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1562 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1563 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1564
1565 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1566 sdata = netdev_priv(ndev);
1567 ndev->ieee80211_ptr = &sdata->wdev;
1568 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1569 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1570
1571 sdata->dev = ndev;
1572 }
1573
1574 /* initialise type-independent data */
1575 sdata->wdev.wiphy = local->hw.wiphy;
1576 sdata->local = local;
1577
1578 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1579 skb_queue_head_init(&sdata->fragments[i].skb_list);
1580
1581 INIT_LIST_HEAD(&sdata->key_list);
1582
1583 spin_lock_init(&sdata->cleanup_stations_lock);
1584 INIT_LIST_HEAD(&sdata->cleanup_stations);
1585 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1586
1587 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1588 struct ieee80211_supported_band *sband;
1589 sband = local->hw.wiphy->bands[i];
1590 sdata->rc_rateidx_mask[i] =
1591 sband ? (1 << sband->n_bitrates) - 1 : 0;
1592 if (sband)
1593 memcpy(sdata->rc_rateidx_mcs_mask[i],
1594 sband->ht_cap.mcs.rx_mask,
1595 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1596 else
1597 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1598 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1599 }
1600
1601 ieee80211_set_default_queues(sdata);
1602
1603 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1604 sdata->user_power_level = local->user_power_level;
1605
1606 /* setup type-dependent data */
1607 ieee80211_setup_sdata(sdata, type);
1608
1609 if (ndev) {
1610 if (params) {
1611 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1612 if (type == NL80211_IFTYPE_STATION)
1613 sdata->u.mgd.use_4addr = params->use_4addr;
1614 }
1615
1616 ndev->features |= local->hw.netdev_features;
1617
1618 ret = register_netdevice(ndev);
1619 if (ret) {
1620 free_netdev(ndev);
1621 return ret;
1622 }
1623 }
1624
1625 mutex_lock(&local->iflist_mtx);
1626 list_add_tail_rcu(&sdata->list, &local->interfaces);
1627 mutex_unlock(&local->iflist_mtx);
1628
1629 if (new_wdev)
1630 *new_wdev = &sdata->wdev;
1631
1632 return 0;
1633 }
1634
1635 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1636 {
1637 ASSERT_RTNL();
1638
1639 mutex_lock(&sdata->local->iflist_mtx);
1640 list_del_rcu(&sdata->list);
1641 mutex_unlock(&sdata->local->iflist_mtx);
1642
1643 synchronize_rcu();
1644
1645 if (sdata->dev) {
1646 unregister_netdevice(sdata->dev);
1647 } else {
1648 cfg80211_unregister_wdev(&sdata->wdev);
1649 kfree(sdata);
1650 }
1651 }
1652
1653 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1654 {
1655 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1656 return;
1657 ieee80211_do_stop(sdata, true);
1658 ieee80211_teardown_sdata(sdata);
1659 }
1660
1661 /*
1662 * Remove all interfaces, may only be called at hardware unregistration
1663 * time because it doesn't do RCU-safe list removals.
1664 */
1665 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1666 {
1667 struct ieee80211_sub_if_data *sdata, *tmp;
1668 LIST_HEAD(unreg_list);
1669 LIST_HEAD(wdev_list);
1670
1671 ASSERT_RTNL();
1672
1673 mutex_lock(&local->iflist_mtx);
1674 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1675 list_del(&sdata->list);
1676
1677 if (sdata->dev)
1678 unregister_netdevice_queue(sdata->dev, &unreg_list);
1679 else
1680 list_add(&sdata->list, &wdev_list);
1681 }
1682 mutex_unlock(&local->iflist_mtx);
1683 unregister_netdevice_many(&unreg_list);
1684 list_del(&unreg_list);
1685
1686 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1687 list_del(&sdata->list);
1688 cfg80211_unregister_wdev(&sdata->wdev);
1689 kfree(sdata);
1690 }
1691 }
1692
1693 static int netdev_notify(struct notifier_block *nb,
1694 unsigned long state,
1695 void *ndev)
1696 {
1697 struct net_device *dev = ndev;
1698 struct ieee80211_sub_if_data *sdata;
1699
1700 if (state != NETDEV_CHANGENAME)
1701 return 0;
1702
1703 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1704 return 0;
1705
1706 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1707 return 0;
1708
1709 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1710
1711 memcpy(sdata->name, dev->name, IFNAMSIZ);
1712
1713 ieee80211_debugfs_rename_netdev(sdata);
1714 return 0;
1715 }
1716
1717 static struct notifier_block mac80211_netdev_notifier = {
1718 .notifier_call = netdev_notify,
1719 };
1720
1721 int ieee80211_iface_init(void)
1722 {
1723 return register_netdevice_notifier(&mac80211_netdev_notifier);
1724 }
1725
1726 void ieee80211_iface_exit(void)
1727 {
1728 unregister_netdevice_notifier(&mac80211_netdev_notifier);
1729 }
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