Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / mac80211 / iface.c
blob9228ac73c429921673bf2c058e821a07dcdfec92
1 /*
2 * Interface handling
4 * Copyright 2002-2005, Instant802 Networks, Inc.
5 * Copyright 2005-2006, Devicescape Software, Inc.
6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (c) 2016 Intel Deutschland GmbH
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/if_arp.h>
18 #include <linux/netdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "sta_info.h"
24 #include "debugfs_netdev.h"
25 #include "mesh.h"
26 #include "led.h"
27 #include "driver-ops.h"
28 #include "wme.h"
29 #include "rate.h"
31 /**
32 * DOC: Interface list locking
34 * The interface list in each struct ieee80211_local is protected
35 * three-fold:
37 * (1) modifications may only be done under the RTNL
38 * (2) modifications and readers are protected against each other by
39 * the iflist_mtx.
40 * (3) modifications are done in an RCU manner so atomic readers
41 * can traverse the list in RCU-safe blocks.
43 * As a consequence, reads (traversals) of the list can be protected
44 * by either the RTNL, the iflist_mtx or RCU.
47 static void ieee80211_iface_work(struct work_struct *work);
49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
51 struct ieee80211_chanctx_conf *chanctx_conf;
52 int power;
54 rcu_read_lock();
55 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
56 if (!chanctx_conf) {
57 rcu_read_unlock();
58 return false;
61 power = ieee80211_chandef_max_power(&chanctx_conf->def);
62 rcu_read_unlock();
64 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
65 power = min(power, sdata->user_power_level);
67 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
68 power = min(power, sdata->ap_power_level);
70 if (power != sdata->vif.bss_conf.txpower) {
71 sdata->vif.bss_conf.txpower = power;
72 ieee80211_hw_config(sdata->local, 0);
73 return true;
76 return false;
79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
80 bool update_bss)
82 if (__ieee80211_recalc_txpower(sdata) ||
83 (update_bss && ieee80211_sdata_running(sdata)))
84 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
90 return 0;
92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
93 return IEEE80211_CONF_CHANGE_IDLE;
96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
99 return 0;
101 ieee80211_flush_queues(local, NULL, false);
103 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104 return IEEE80211_CONF_CHANGE_IDLE;
107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108 bool force_active)
110 bool working, scanning, active;
111 unsigned int led_trig_start = 0, led_trig_stop = 0;
113 lockdep_assert_held(&local->mtx);
115 active = force_active ||
116 !list_empty(&local->chanctx_list) ||
117 local->monitors;
119 working = !local->ops->remain_on_channel &&
120 !list_empty(&local->roc_list);
122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
125 if (working || scanning)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
130 if (active)
131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 else
133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
137 if (working || scanning || active)
138 return __ieee80211_idle_off(local);
139 return __ieee80211_idle_on(local);
142 u32 ieee80211_idle_off(struct ieee80211_local *local)
144 return __ieee80211_recalc_idle(local, true);
147 void ieee80211_recalc_idle(struct ieee80211_local *local)
149 u32 change = __ieee80211_recalc_idle(local, false);
150 if (change)
151 ieee80211_hw_config(local, change);
154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155 bool check_dup)
157 struct ieee80211_local *local = sdata->local;
158 struct ieee80211_sub_if_data *iter;
159 u64 new, mask, tmp;
160 u8 *m;
161 int ret = 0;
163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164 return 0;
166 m = addr;
167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
171 m = local->hw.wiphy->addr_mask;
172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176 if (!check_dup)
177 return ret;
179 mutex_lock(&local->iflist_mtx);
180 list_for_each_entry(iter, &local->interfaces, list) {
181 if (iter == sdata)
182 continue;
184 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186 continue;
188 m = iter->vif.addr;
189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
193 if ((new & ~mask) != (tmp & ~mask)) {
194 ret = -EINVAL;
195 break;
198 mutex_unlock(&local->iflist_mtx);
200 return ret;
203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
205 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
206 struct sockaddr *sa = addr;
207 bool check_dup = true;
208 int ret;
210 if (ieee80211_sdata_running(sdata))
211 return -EBUSY;
213 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
214 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
215 check_dup = false;
217 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
218 if (ret)
219 return ret;
221 ret = eth_mac_addr(dev, sa);
223 if (ret == 0)
224 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
226 return ret;
229 static inline int identical_mac_addr_allowed(int type1, int type2)
231 return type1 == NL80211_IFTYPE_MONITOR ||
232 type2 == NL80211_IFTYPE_MONITOR ||
233 type1 == NL80211_IFTYPE_P2P_DEVICE ||
234 type2 == NL80211_IFTYPE_P2P_DEVICE ||
235 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
236 (type1 == NL80211_IFTYPE_WDS &&
237 (type2 == NL80211_IFTYPE_WDS ||
238 type2 == NL80211_IFTYPE_AP)) ||
239 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
240 (type1 == NL80211_IFTYPE_AP_VLAN &&
241 (type2 == NL80211_IFTYPE_AP ||
242 type2 == NL80211_IFTYPE_AP_VLAN));
245 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
246 enum nl80211_iftype iftype)
248 struct ieee80211_local *local = sdata->local;
249 struct ieee80211_sub_if_data *nsdata;
250 int ret;
252 ASSERT_RTNL();
254 /* we hold the RTNL here so can safely walk the list */
255 list_for_each_entry(nsdata, &local->interfaces, list) {
256 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
258 * Only OCB and monitor mode may coexist
260 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
261 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
262 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
263 nsdata->vif.type == NL80211_IFTYPE_OCB))
264 return -EBUSY;
267 * Allow only a single IBSS interface to be up at any
268 * time. This is restricted because beacon distribution
269 * cannot work properly if both are in the same IBSS.
271 * To remove this restriction we'd have to disallow them
272 * from setting the same SSID on different IBSS interfaces
273 * belonging to the same hardware. Then, however, we're
274 * faced with having to adopt two different TSF timers...
276 if (iftype == NL80211_IFTYPE_ADHOC &&
277 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
278 return -EBUSY;
280 * will not add another interface while any channel
281 * switch is active.
283 if (nsdata->vif.csa_active)
284 return -EBUSY;
287 * The remaining checks are only performed for interfaces
288 * with the same MAC address.
290 if (!ether_addr_equal(sdata->vif.addr,
291 nsdata->vif.addr))
292 continue;
295 * check whether it may have the same address
297 if (!identical_mac_addr_allowed(iftype,
298 nsdata->vif.type))
299 return -ENOTUNIQ;
302 * can only add VLANs to enabled APs
304 if (iftype == NL80211_IFTYPE_AP_VLAN &&
305 nsdata->vif.type == NL80211_IFTYPE_AP)
306 sdata->bss = &nsdata->u.ap;
310 mutex_lock(&local->chanctx_mtx);
311 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
312 mutex_unlock(&local->chanctx_mtx);
313 return ret;
316 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
317 enum nl80211_iftype iftype)
319 int n_queues = sdata->local->hw.queues;
320 int i;
322 if (iftype == NL80211_IFTYPE_NAN)
323 return 0;
325 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
326 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
327 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
328 IEEE80211_INVAL_HW_QUEUE))
329 return -EINVAL;
330 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
331 n_queues))
332 return -EINVAL;
336 if ((iftype != NL80211_IFTYPE_AP &&
337 iftype != NL80211_IFTYPE_P2P_GO &&
338 iftype != NL80211_IFTYPE_MESH_POINT) ||
339 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
340 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
341 return 0;
344 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
345 return -EINVAL;
347 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
348 return -EINVAL;
350 return 0;
353 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
354 const int offset)
356 struct ieee80211_local *local = sdata->local;
357 u32 flags = sdata->u.mntr.flags;
359 #define ADJUST(_f, _s) do { \
360 if (flags & MONITOR_FLAG_##_f) \
361 local->fif_##_s += offset; \
362 } while (0)
364 ADJUST(FCSFAIL, fcsfail);
365 ADJUST(PLCPFAIL, plcpfail);
366 ADJUST(CONTROL, control);
367 ADJUST(CONTROL, pspoll);
368 ADJUST(OTHER_BSS, other_bss);
370 #undef ADJUST
373 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
375 struct ieee80211_local *local = sdata->local;
376 int i;
378 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
379 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
380 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
381 else if (local->hw.queues >= IEEE80211_NUM_ACS)
382 sdata->vif.hw_queue[i] = i;
383 else
384 sdata->vif.hw_queue[i] = 0;
386 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
389 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
391 struct ieee80211_sub_if_data *sdata;
392 int ret;
394 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
395 return 0;
397 ASSERT_RTNL();
399 if (local->monitor_sdata)
400 return 0;
402 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
403 if (!sdata)
404 return -ENOMEM;
406 /* set up data */
407 sdata->local = local;
408 sdata->vif.type = NL80211_IFTYPE_MONITOR;
409 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
410 wiphy_name(local->hw.wiphy));
411 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
413 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
415 ieee80211_set_default_queues(sdata);
417 ret = drv_add_interface(local, sdata);
418 if (WARN_ON(ret)) {
419 /* ok .. stupid driver, it asked for this! */
420 kfree(sdata);
421 return ret;
424 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
425 if (ret) {
426 kfree(sdata);
427 return ret;
430 mutex_lock(&local->iflist_mtx);
431 rcu_assign_pointer(local->monitor_sdata, sdata);
432 mutex_unlock(&local->iflist_mtx);
434 mutex_lock(&local->mtx);
435 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
436 IEEE80211_CHANCTX_EXCLUSIVE);
437 mutex_unlock(&local->mtx);
438 if (ret) {
439 mutex_lock(&local->iflist_mtx);
440 RCU_INIT_POINTER(local->monitor_sdata, NULL);
441 mutex_unlock(&local->iflist_mtx);
442 synchronize_net();
443 drv_remove_interface(local, sdata);
444 kfree(sdata);
445 return ret;
448 skb_queue_head_init(&sdata->skb_queue);
449 INIT_WORK(&sdata->work, ieee80211_iface_work);
451 return 0;
454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
456 struct ieee80211_sub_if_data *sdata;
458 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
459 return;
461 ASSERT_RTNL();
463 mutex_lock(&local->iflist_mtx);
465 sdata = rcu_dereference_protected(local->monitor_sdata,
466 lockdep_is_held(&local->iflist_mtx));
467 if (!sdata) {
468 mutex_unlock(&local->iflist_mtx);
469 return;
472 RCU_INIT_POINTER(local->monitor_sdata, NULL);
473 mutex_unlock(&local->iflist_mtx);
475 synchronize_net();
477 mutex_lock(&local->mtx);
478 ieee80211_vif_release_channel(sdata);
479 mutex_unlock(&local->mtx);
481 drv_remove_interface(local, sdata);
483 kfree(sdata);
487 * NOTE: Be very careful when changing this function, it must NOT return
488 * an error on interface type changes that have been pre-checked, so most
489 * checks should be in ieee80211_check_concurrent_iface.
491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
493 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
494 struct net_device *dev = wdev->netdev;
495 struct ieee80211_local *local = sdata->local;
496 struct sta_info *sta;
497 u32 changed = 0;
498 int res;
499 u32 hw_reconf_flags = 0;
501 switch (sdata->vif.type) {
502 case NL80211_IFTYPE_WDS:
503 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
504 return -ENOLINK;
505 break;
506 case NL80211_IFTYPE_AP_VLAN: {
507 struct ieee80211_sub_if_data *master;
509 if (!sdata->bss)
510 return -ENOLINK;
512 mutex_lock(&local->mtx);
513 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
514 mutex_unlock(&local->mtx);
516 master = container_of(sdata->bss,
517 struct ieee80211_sub_if_data, u.ap);
518 sdata->control_port_protocol =
519 master->control_port_protocol;
520 sdata->control_port_no_encrypt =
521 master->control_port_no_encrypt;
522 sdata->vif.cab_queue = master->vif.cab_queue;
523 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
524 sizeof(sdata->vif.hw_queue));
525 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
527 mutex_lock(&local->key_mtx);
528 sdata->crypto_tx_tailroom_needed_cnt +=
529 master->crypto_tx_tailroom_needed_cnt;
530 mutex_unlock(&local->key_mtx);
532 break;
534 case NL80211_IFTYPE_AP:
535 sdata->bss = &sdata->u.ap;
536 break;
537 case NL80211_IFTYPE_MESH_POINT:
538 case NL80211_IFTYPE_STATION:
539 case NL80211_IFTYPE_MONITOR:
540 case NL80211_IFTYPE_ADHOC:
541 case NL80211_IFTYPE_P2P_DEVICE:
542 case NL80211_IFTYPE_OCB:
543 case NL80211_IFTYPE_NAN:
544 /* no special treatment */
545 break;
546 case NL80211_IFTYPE_UNSPECIFIED:
547 case NUM_NL80211_IFTYPES:
548 case NL80211_IFTYPE_P2P_CLIENT:
549 case NL80211_IFTYPE_P2P_GO:
550 /* cannot happen */
551 WARN_ON(1);
552 break;
555 if (local->open_count == 0) {
556 res = drv_start(local);
557 if (res)
558 goto err_del_bss;
559 /* we're brought up, everything changes */
560 hw_reconf_flags = ~0;
561 ieee80211_led_radio(local, true);
562 ieee80211_mod_tpt_led_trig(local,
563 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
567 * Copy the hopefully now-present MAC address to
568 * this interface, if it has the special null one.
570 if (dev && is_zero_ether_addr(dev->dev_addr)) {
571 memcpy(dev->dev_addr,
572 local->hw.wiphy->perm_addr,
573 ETH_ALEN);
574 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
576 if (!is_valid_ether_addr(dev->dev_addr)) {
577 res = -EADDRNOTAVAIL;
578 goto err_stop;
582 switch (sdata->vif.type) {
583 case NL80211_IFTYPE_AP_VLAN:
584 /* no need to tell driver, but set carrier and chanctx */
585 if (rtnl_dereference(sdata->bss->beacon)) {
586 ieee80211_vif_vlan_copy_chanctx(sdata);
587 netif_carrier_on(dev);
588 } else {
589 netif_carrier_off(dev);
591 break;
592 case NL80211_IFTYPE_MONITOR:
593 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
594 local->cooked_mntrs++;
595 break;
598 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
599 res = drv_add_interface(local, sdata);
600 if (res)
601 goto err_stop;
602 } else if (local->monitors == 0 && local->open_count == 0) {
603 res = ieee80211_add_virtual_monitor(local);
604 if (res)
605 goto err_stop;
608 /* must be before the call to ieee80211_configure_filter */
609 local->monitors++;
610 if (local->monitors == 1) {
611 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
612 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
615 ieee80211_adjust_monitor_flags(sdata, 1);
616 ieee80211_configure_filter(local);
617 mutex_lock(&local->mtx);
618 ieee80211_recalc_idle(local);
619 mutex_unlock(&local->mtx);
621 netif_carrier_on(dev);
622 break;
623 default:
624 if (coming_up) {
625 ieee80211_del_virtual_monitor(local);
627 res = drv_add_interface(local, sdata);
628 if (res)
629 goto err_stop;
630 res = ieee80211_check_queues(sdata,
631 ieee80211_vif_type_p2p(&sdata->vif));
632 if (res)
633 goto err_del_interface;
636 if (sdata->vif.type == NL80211_IFTYPE_AP) {
637 local->fif_pspoll++;
638 local->fif_probe_req++;
640 ieee80211_configure_filter(local);
641 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
642 local->fif_probe_req++;
645 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
646 sdata->vif.type != NL80211_IFTYPE_NAN)
647 changed |= ieee80211_reset_erp_info(sdata);
648 ieee80211_bss_info_change_notify(sdata, changed);
650 switch (sdata->vif.type) {
651 case NL80211_IFTYPE_STATION:
652 case NL80211_IFTYPE_ADHOC:
653 case NL80211_IFTYPE_AP:
654 case NL80211_IFTYPE_MESH_POINT:
655 case NL80211_IFTYPE_OCB:
656 netif_carrier_off(dev);
657 break;
658 case NL80211_IFTYPE_WDS:
659 case NL80211_IFTYPE_P2P_DEVICE:
660 case NL80211_IFTYPE_NAN:
661 break;
662 default:
663 /* not reached */
664 WARN_ON(1);
668 * Set default queue parameters so drivers don't
669 * need to initialise the hardware if the hardware
670 * doesn't start up with sane defaults.
671 * Enable QoS for anything but station interfaces.
673 ieee80211_set_wmm_default(sdata, true,
674 sdata->vif.type != NL80211_IFTYPE_STATION);
677 set_bit(SDATA_STATE_RUNNING, &sdata->state);
679 switch (sdata->vif.type) {
680 case NL80211_IFTYPE_WDS:
681 /* Create STA entry for the WDS peer */
682 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
683 GFP_KERNEL);
684 if (!sta) {
685 res = -ENOMEM;
686 goto err_del_interface;
689 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
690 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
691 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
693 res = sta_info_insert(sta);
694 if (res) {
695 /* STA has been freed */
696 goto err_del_interface;
699 rate_control_rate_init(sta);
700 netif_carrier_on(dev);
701 break;
702 case NL80211_IFTYPE_P2P_DEVICE:
703 rcu_assign_pointer(local->p2p_sdata, sdata);
704 break;
705 case NL80211_IFTYPE_MONITOR:
706 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
707 break;
708 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
709 break;
710 default:
711 break;
715 * set_multicast_list will be invoked by the networking core
716 * which will check whether any increments here were done in
717 * error and sync them down to the hardware as filter flags.
719 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
720 atomic_inc(&local->iff_allmultis);
722 if (coming_up)
723 local->open_count++;
725 if (hw_reconf_flags)
726 ieee80211_hw_config(local, hw_reconf_flags);
728 ieee80211_recalc_ps(local);
730 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
731 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
732 local->ops->wake_tx_queue) {
733 /* XXX: for AP_VLAN, actually track AP queues */
734 netif_tx_start_all_queues(dev);
735 } else if (dev) {
736 unsigned long flags;
737 int n_acs = IEEE80211_NUM_ACS;
738 int ac;
740 if (local->hw.queues < IEEE80211_NUM_ACS)
741 n_acs = 1;
743 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
744 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
745 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
746 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
747 for (ac = 0; ac < n_acs; ac++) {
748 int ac_queue = sdata->vif.hw_queue[ac];
750 if (local->queue_stop_reasons[ac_queue] == 0 &&
751 skb_queue_empty(&local->pending[ac_queue]))
752 netif_start_subqueue(dev, ac);
755 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
758 return 0;
759 err_del_interface:
760 drv_remove_interface(local, sdata);
761 err_stop:
762 if (!local->open_count)
763 drv_stop(local);
764 err_del_bss:
765 sdata->bss = NULL;
766 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
767 mutex_lock(&local->mtx);
768 list_del(&sdata->u.vlan.list);
769 mutex_unlock(&local->mtx);
771 /* might already be clear but that doesn't matter */
772 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
773 return res;
776 static int ieee80211_open(struct net_device *dev)
778 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
779 int err;
781 /* fail early if user set an invalid address */
782 if (!is_valid_ether_addr(dev->dev_addr))
783 return -EADDRNOTAVAIL;
785 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
786 if (err)
787 return err;
789 return ieee80211_do_open(&sdata->wdev, true);
792 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
793 bool going_down)
795 struct ieee80211_local *local = sdata->local;
796 struct fq *fq = &local->fq;
797 unsigned long flags;
798 struct sk_buff *skb, *tmp;
799 u32 hw_reconf_flags = 0;
800 int i, flushed;
801 struct ps_data *ps;
802 struct cfg80211_chan_def chandef;
803 bool cancel_scan;
804 struct cfg80211_nan_func *func;
806 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
808 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
809 if (cancel_scan)
810 ieee80211_scan_cancel(local);
813 * Stop TX on this interface first.
815 if (sdata->dev)
816 netif_tx_stop_all_queues(sdata->dev);
818 ieee80211_roc_purge(local, sdata);
820 switch (sdata->vif.type) {
821 case NL80211_IFTYPE_STATION:
822 ieee80211_mgd_stop(sdata);
823 break;
824 case NL80211_IFTYPE_ADHOC:
825 ieee80211_ibss_stop(sdata);
826 break;
827 case NL80211_IFTYPE_AP:
828 cancel_work_sync(&sdata->u.ap.request_smps_work);
829 break;
830 case NL80211_IFTYPE_MONITOR:
831 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
832 break;
833 list_del_rcu(&sdata->u.mntr.list);
834 break;
835 default:
836 break;
840 * Remove all stations associated with this interface.
842 * This must be done before calling ops->remove_interface()
843 * because otherwise we can later invoke ops->sta_notify()
844 * whenever the STAs are removed, and that invalidates driver
845 * assumptions about always getting a vif pointer that is valid
846 * (because if we remove a STA after ops->remove_interface()
847 * the driver will have removed the vif info already!)
849 * In WDS mode a station must exist here and be flushed, for
850 * AP_VLANs stations may exist since there's nothing else that
851 * would have removed them, but in other modes there shouldn't
852 * be any stations.
854 flushed = sta_info_flush(sdata);
855 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
856 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
857 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
859 /* don't count this interface for allmulti while it is down */
860 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
861 atomic_dec(&local->iff_allmultis);
863 if (sdata->vif.type == NL80211_IFTYPE_AP) {
864 local->fif_pspoll--;
865 local->fif_probe_req--;
866 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
867 local->fif_probe_req--;
870 if (sdata->dev) {
871 netif_addr_lock_bh(sdata->dev);
872 spin_lock_bh(&local->filter_lock);
873 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
874 sdata->dev->addr_len);
875 spin_unlock_bh(&local->filter_lock);
876 netif_addr_unlock_bh(sdata->dev);
879 del_timer_sync(&local->dynamic_ps_timer);
880 cancel_work_sync(&local->dynamic_ps_enable_work);
882 cancel_work_sync(&sdata->recalc_smps);
883 sdata_lock(sdata);
884 mutex_lock(&local->mtx);
885 sdata->vif.csa_active = false;
886 if (sdata->vif.type == NL80211_IFTYPE_STATION)
887 sdata->u.mgd.csa_waiting_bcn = false;
888 if (sdata->csa_block_tx) {
889 ieee80211_wake_vif_queues(local, sdata,
890 IEEE80211_QUEUE_STOP_REASON_CSA);
891 sdata->csa_block_tx = false;
893 mutex_unlock(&local->mtx);
894 sdata_unlock(sdata);
896 cancel_work_sync(&sdata->csa_finalize_work);
898 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
900 if (sdata->wdev.cac_started) {
901 chandef = sdata->vif.bss_conf.chandef;
902 WARN_ON(local->suspended);
903 mutex_lock(&local->mtx);
904 ieee80211_vif_release_channel(sdata);
905 mutex_unlock(&local->mtx);
906 cfg80211_cac_event(sdata->dev, &chandef,
907 NL80211_RADAR_CAC_ABORTED,
908 GFP_KERNEL);
911 /* APs need special treatment */
912 if (sdata->vif.type == NL80211_IFTYPE_AP) {
913 struct ieee80211_sub_if_data *vlan, *tmpsdata;
915 /* down all dependent devices, that is VLANs */
916 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
917 u.vlan.list)
918 dev_close(vlan->dev);
919 WARN_ON(!list_empty(&sdata->u.ap.vlans));
920 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
921 /* remove all packets in parent bc_buf pointing to this dev */
922 ps = &sdata->bss->ps;
924 spin_lock_irqsave(&ps->bc_buf.lock, flags);
925 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
926 if (skb->dev == sdata->dev) {
927 __skb_unlink(skb, &ps->bc_buf);
928 local->total_ps_buffered--;
929 ieee80211_free_txskb(&local->hw, skb);
932 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
935 if (going_down)
936 local->open_count--;
938 switch (sdata->vif.type) {
939 case NL80211_IFTYPE_AP_VLAN:
940 mutex_lock(&local->mtx);
941 list_del(&sdata->u.vlan.list);
942 mutex_unlock(&local->mtx);
943 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
944 /* see comment in the default case below */
945 ieee80211_free_keys(sdata, true);
946 /* no need to tell driver */
947 break;
948 case NL80211_IFTYPE_MONITOR:
949 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
950 local->cooked_mntrs--;
951 break;
954 local->monitors--;
955 if (local->monitors == 0) {
956 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
957 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
960 ieee80211_adjust_monitor_flags(sdata, -1);
961 break;
962 case NL80211_IFTYPE_NAN:
963 /* clean all the functions */
964 spin_lock_bh(&sdata->u.nan.func_lock);
966 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
967 idr_remove(&sdata->u.nan.function_inst_ids, i);
968 cfg80211_free_nan_func(func);
970 idr_destroy(&sdata->u.nan.function_inst_ids);
972 spin_unlock_bh(&sdata->u.nan.func_lock);
973 break;
974 case NL80211_IFTYPE_P2P_DEVICE:
975 /* relies on synchronize_rcu() below */
976 RCU_INIT_POINTER(local->p2p_sdata, NULL);
977 /* fall through */
978 default:
979 cancel_work_sync(&sdata->work);
981 * When we get here, the interface is marked down.
982 * Free the remaining keys, if there are any
983 * (which can happen in AP mode if userspace sets
984 * keys before the interface is operating, and maybe
985 * also in WDS mode)
987 * Force the key freeing to always synchronize_net()
988 * to wait for the RX path in case it is using this
989 * interface enqueuing frames at this very time on
990 * another CPU.
992 ieee80211_free_keys(sdata, true);
993 skb_queue_purge(&sdata->skb_queue);
996 sdata->bss = NULL;
998 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
999 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1000 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1001 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1002 if (info->control.vif == &sdata->vif) {
1003 __skb_unlink(skb, &local->pending[i]);
1004 ieee80211_free_txskb(&local->hw, skb);
1008 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1010 if (sdata->vif.txq) {
1011 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
1013 spin_lock_bh(&fq->lock);
1014 ieee80211_txq_purge(local, txqi);
1015 spin_unlock_bh(&fq->lock);
1018 if (local->open_count == 0)
1019 ieee80211_clear_tx_pending(local);
1022 * If the interface goes down while suspended, presumably because
1023 * the device was unplugged and that happens before our resume,
1024 * then the driver is already unconfigured and the remainder of
1025 * this function isn't needed.
1026 * XXX: what about WoWLAN? If the device has software state, e.g.
1027 * memory allocated, it might expect teardown commands from
1028 * mac80211 here?
1030 if (local->suspended) {
1031 WARN_ON(local->wowlan);
1032 WARN_ON(rtnl_dereference(local->monitor_sdata));
1033 return;
1036 switch (sdata->vif.type) {
1037 case NL80211_IFTYPE_AP_VLAN:
1038 break;
1039 case NL80211_IFTYPE_MONITOR:
1040 if (local->monitors == 0)
1041 ieee80211_del_virtual_monitor(local);
1043 mutex_lock(&local->mtx);
1044 ieee80211_recalc_idle(local);
1045 mutex_unlock(&local->mtx);
1047 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1048 break;
1050 /* fall through */
1051 default:
1052 if (going_down)
1053 drv_remove_interface(local, sdata);
1056 ieee80211_recalc_ps(local);
1058 if (cancel_scan)
1059 flush_delayed_work(&local->scan_work);
1061 if (local->open_count == 0) {
1062 ieee80211_stop_device(local);
1064 /* no reconfiguring after stop! */
1065 return;
1068 /* do after stop to avoid reconfiguring when we stop anyway */
1069 ieee80211_configure_filter(local);
1070 ieee80211_hw_config(local, hw_reconf_flags);
1072 if (local->monitors == local->open_count)
1073 ieee80211_add_virtual_monitor(local);
1076 static int ieee80211_stop(struct net_device *dev)
1078 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080 ieee80211_do_stop(sdata, true);
1082 return 0;
1085 static void ieee80211_set_multicast_list(struct net_device *dev)
1087 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1088 struct ieee80211_local *local = sdata->local;
1089 int allmulti, sdata_allmulti;
1091 allmulti = !!(dev->flags & IFF_ALLMULTI);
1092 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1094 if (allmulti != sdata_allmulti) {
1095 if (dev->flags & IFF_ALLMULTI)
1096 atomic_inc(&local->iff_allmultis);
1097 else
1098 atomic_dec(&local->iff_allmultis);
1099 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1102 spin_lock_bh(&local->filter_lock);
1103 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1104 spin_unlock_bh(&local->filter_lock);
1105 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1109 * Called when the netdev is removed or, by the code below, before
1110 * the interface type changes.
1112 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1114 int i;
1116 /* free extra data */
1117 ieee80211_free_keys(sdata, false);
1119 ieee80211_debugfs_remove_netdev(sdata);
1121 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1122 __skb_queue_purge(&sdata->fragments[i].skb_list);
1123 sdata->fragment_next = 0;
1125 if (ieee80211_vif_is_mesh(&sdata->vif))
1126 ieee80211_mesh_teardown_sdata(sdata);
1129 static void ieee80211_uninit(struct net_device *dev)
1131 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1134 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1135 struct sk_buff *skb,
1136 void *accel_priv,
1137 select_queue_fallback_t fallback)
1139 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1142 static void
1143 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1145 int i;
1147 for_each_possible_cpu(i) {
1148 const struct pcpu_sw_netstats *tstats;
1149 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1150 unsigned int start;
1152 tstats = per_cpu_ptr(dev->tstats, i);
1154 do {
1155 start = u64_stats_fetch_begin_irq(&tstats->syncp);
1156 rx_packets = tstats->rx_packets;
1157 tx_packets = tstats->tx_packets;
1158 rx_bytes = tstats->rx_bytes;
1159 tx_bytes = tstats->tx_bytes;
1160 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1162 stats->rx_packets += rx_packets;
1163 stats->tx_packets += tx_packets;
1164 stats->rx_bytes += rx_bytes;
1165 stats->tx_bytes += tx_bytes;
1169 static const struct net_device_ops ieee80211_dataif_ops = {
1170 .ndo_open = ieee80211_open,
1171 .ndo_stop = ieee80211_stop,
1172 .ndo_uninit = ieee80211_uninit,
1173 .ndo_start_xmit = ieee80211_subif_start_xmit,
1174 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1175 .ndo_set_mac_address = ieee80211_change_mac,
1176 .ndo_select_queue = ieee80211_netdev_select_queue,
1177 .ndo_get_stats64 = ieee80211_get_stats64,
1180 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1181 struct sk_buff *skb,
1182 void *accel_priv,
1183 select_queue_fallback_t fallback)
1185 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1186 struct ieee80211_local *local = sdata->local;
1187 struct ieee80211_hdr *hdr;
1188 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1190 if (local->hw.queues < IEEE80211_NUM_ACS)
1191 return 0;
1193 if (skb->len < 4 ||
1194 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1195 return 0; /* doesn't matter, frame will be dropped */
1197 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1199 return ieee80211_select_queue_80211(sdata, skb, hdr);
1202 static const struct net_device_ops ieee80211_monitorif_ops = {
1203 .ndo_open = ieee80211_open,
1204 .ndo_stop = ieee80211_stop,
1205 .ndo_uninit = ieee80211_uninit,
1206 .ndo_start_xmit = ieee80211_monitor_start_xmit,
1207 .ndo_set_rx_mode = ieee80211_set_multicast_list,
1208 .ndo_set_mac_address = ieee80211_change_mac,
1209 .ndo_select_queue = ieee80211_monitor_select_queue,
1210 .ndo_get_stats64 = ieee80211_get_stats64,
1213 static void ieee80211_if_free(struct net_device *dev)
1215 free_percpu(dev->tstats);
1218 static void ieee80211_if_setup(struct net_device *dev)
1220 ether_setup(dev);
1221 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1222 dev->netdev_ops = &ieee80211_dataif_ops;
1223 dev->needs_free_netdev = true;
1224 dev->priv_destructor = ieee80211_if_free;
1227 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1229 ieee80211_if_setup(dev);
1230 dev->priv_flags |= IFF_NO_QUEUE;
1233 static void ieee80211_iface_work(struct work_struct *work)
1235 struct ieee80211_sub_if_data *sdata =
1236 container_of(work, struct ieee80211_sub_if_data, work);
1237 struct ieee80211_local *local = sdata->local;
1238 struct sk_buff *skb;
1239 struct sta_info *sta;
1241 if (!ieee80211_sdata_running(sdata))
1242 return;
1244 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1245 return;
1247 if (!ieee80211_can_run_worker(local))
1248 return;
1250 /* first process frames */
1251 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1252 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1254 if (ieee80211_is_action(mgmt->frame_control) &&
1255 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1256 int len = skb->len;
1258 mutex_lock(&local->sta_mtx);
1259 sta = sta_info_get_bss(sdata, mgmt->sa);
1260 if (sta) {
1261 switch (mgmt->u.action.u.addba_req.action_code) {
1262 case WLAN_ACTION_ADDBA_REQ:
1263 ieee80211_process_addba_request(
1264 local, sta, mgmt, len);
1265 break;
1266 case WLAN_ACTION_ADDBA_RESP:
1267 ieee80211_process_addba_resp(local, sta,
1268 mgmt, len);
1269 break;
1270 case WLAN_ACTION_DELBA:
1271 ieee80211_process_delba(sdata, sta,
1272 mgmt, len);
1273 break;
1274 default:
1275 WARN_ON(1);
1276 break;
1279 mutex_unlock(&local->sta_mtx);
1280 } else if (ieee80211_is_action(mgmt->frame_control) &&
1281 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1282 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1283 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1284 struct ieee80211_rx_status *status;
1285 enum nl80211_band band;
1286 u8 opmode;
1288 status = IEEE80211_SKB_RXCB(skb);
1289 band = status->band;
1290 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1292 mutex_lock(&local->sta_mtx);
1293 sta = sta_info_get_bss(sdata, mgmt->sa);
1295 if (sta)
1296 ieee80211_vht_handle_opmode(sdata, sta,
1297 opmode,
1298 band);
1300 mutex_unlock(&local->sta_mtx);
1301 break;
1303 case WLAN_VHT_ACTION_GROUPID_MGMT:
1304 ieee80211_process_mu_groups(sdata, mgmt);
1305 break;
1306 default:
1307 WARN_ON(1);
1308 break;
1310 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1311 struct ieee80211_hdr *hdr = (void *)mgmt;
1313 * So the frame isn't mgmt, but frame_control
1314 * is at the right place anyway, of course, so
1315 * the if statement is correct.
1317 * Warn if we have other data frame types here,
1318 * they must not get here.
1320 WARN_ON(hdr->frame_control &
1321 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1322 WARN_ON(!(hdr->seq_ctrl &
1323 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1325 * This was a fragment of a frame, received while
1326 * a block-ack session was active. That cannot be
1327 * right, so terminate the session.
1329 mutex_lock(&local->sta_mtx);
1330 sta = sta_info_get_bss(sdata, mgmt->sa);
1331 if (sta) {
1332 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1333 IEEE80211_QOS_CTL_TID_MASK;
1335 __ieee80211_stop_rx_ba_session(
1336 sta, tid, WLAN_BACK_RECIPIENT,
1337 WLAN_REASON_QSTA_REQUIRE_SETUP,
1338 true);
1340 mutex_unlock(&local->sta_mtx);
1341 } else switch (sdata->vif.type) {
1342 case NL80211_IFTYPE_STATION:
1343 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1344 break;
1345 case NL80211_IFTYPE_ADHOC:
1346 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1347 break;
1348 case NL80211_IFTYPE_MESH_POINT:
1349 if (!ieee80211_vif_is_mesh(&sdata->vif))
1350 break;
1351 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1352 break;
1353 default:
1354 WARN(1, "frame for unexpected interface type");
1355 break;
1358 kfree_skb(skb);
1361 /* then other type-dependent work */
1362 switch (sdata->vif.type) {
1363 case NL80211_IFTYPE_STATION:
1364 ieee80211_sta_work(sdata);
1365 break;
1366 case NL80211_IFTYPE_ADHOC:
1367 ieee80211_ibss_work(sdata);
1368 break;
1369 case NL80211_IFTYPE_MESH_POINT:
1370 if (!ieee80211_vif_is_mesh(&sdata->vif))
1371 break;
1372 ieee80211_mesh_work(sdata);
1373 break;
1374 case NL80211_IFTYPE_OCB:
1375 ieee80211_ocb_work(sdata);
1376 break;
1377 default:
1378 break;
1382 static void ieee80211_recalc_smps_work(struct work_struct *work)
1384 struct ieee80211_sub_if_data *sdata =
1385 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1387 ieee80211_recalc_smps(sdata);
1391 * Helper function to initialise an interface to a specific type.
1393 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1394 enum nl80211_iftype type)
1396 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1397 0xff, 0xff, 0xff};
1399 /* clear type-dependent union */
1400 memset(&sdata->u, 0, sizeof(sdata->u));
1402 /* and set some type-dependent values */
1403 sdata->vif.type = type;
1404 sdata->vif.p2p = false;
1405 sdata->wdev.iftype = type;
1407 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1408 sdata->control_port_no_encrypt = false;
1409 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1410 sdata->vif.bss_conf.idle = true;
1412 sdata->noack_map = 0;
1414 /* only monitor/p2p-device differ */
1415 if (sdata->dev) {
1416 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1417 sdata->dev->type = ARPHRD_ETHER;
1420 skb_queue_head_init(&sdata->skb_queue);
1421 INIT_WORK(&sdata->work, ieee80211_iface_work);
1422 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1423 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1424 INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1425 INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1427 switch (type) {
1428 case NL80211_IFTYPE_P2P_GO:
1429 type = NL80211_IFTYPE_AP;
1430 sdata->vif.type = type;
1431 sdata->vif.p2p = true;
1432 /* fall through */
1433 case NL80211_IFTYPE_AP:
1434 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1435 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1436 INIT_WORK(&sdata->u.ap.request_smps_work,
1437 ieee80211_request_smps_ap_work);
1438 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1439 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1440 break;
1441 case NL80211_IFTYPE_P2P_CLIENT:
1442 type = NL80211_IFTYPE_STATION;
1443 sdata->vif.type = type;
1444 sdata->vif.p2p = true;
1445 /* fall through */
1446 case NL80211_IFTYPE_STATION:
1447 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1448 ieee80211_sta_setup_sdata(sdata);
1449 break;
1450 case NL80211_IFTYPE_OCB:
1451 sdata->vif.bss_conf.bssid = bssid_wildcard;
1452 ieee80211_ocb_setup_sdata(sdata);
1453 break;
1454 case NL80211_IFTYPE_ADHOC:
1455 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1456 ieee80211_ibss_setup_sdata(sdata);
1457 break;
1458 case NL80211_IFTYPE_MESH_POINT:
1459 if (ieee80211_vif_is_mesh(&sdata->vif))
1460 ieee80211_mesh_init_sdata(sdata);
1461 break;
1462 case NL80211_IFTYPE_MONITOR:
1463 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1464 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1465 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1466 MONITOR_FLAG_OTHER_BSS;
1467 break;
1468 case NL80211_IFTYPE_WDS:
1469 sdata->vif.bss_conf.bssid = NULL;
1470 break;
1471 case NL80211_IFTYPE_NAN:
1472 idr_init(&sdata->u.nan.function_inst_ids);
1473 spin_lock_init(&sdata->u.nan.func_lock);
1474 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1475 break;
1476 case NL80211_IFTYPE_AP_VLAN:
1477 case NL80211_IFTYPE_P2P_DEVICE:
1478 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1479 break;
1480 case NL80211_IFTYPE_UNSPECIFIED:
1481 case NUM_NL80211_IFTYPES:
1482 BUG();
1483 break;
1486 ieee80211_debugfs_add_netdev(sdata);
1489 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1490 enum nl80211_iftype type)
1492 struct ieee80211_local *local = sdata->local;
1493 int ret, err;
1494 enum nl80211_iftype internal_type = type;
1495 bool p2p = false;
1497 ASSERT_RTNL();
1499 if (!local->ops->change_interface)
1500 return -EBUSY;
1502 switch (sdata->vif.type) {
1503 case NL80211_IFTYPE_AP:
1504 case NL80211_IFTYPE_STATION:
1505 case NL80211_IFTYPE_ADHOC:
1506 case NL80211_IFTYPE_OCB:
1508 * Could maybe also all others here?
1509 * Just not sure how that interacts
1510 * with the RX/config path e.g. for
1511 * mesh.
1513 break;
1514 default:
1515 return -EBUSY;
1518 switch (type) {
1519 case NL80211_IFTYPE_AP:
1520 case NL80211_IFTYPE_STATION:
1521 case NL80211_IFTYPE_ADHOC:
1522 case NL80211_IFTYPE_OCB:
1524 * Could probably support everything
1525 * but WDS here (WDS do_open can fail
1526 * under memory pressure, which this
1527 * code isn't prepared to handle).
1529 break;
1530 case NL80211_IFTYPE_P2P_CLIENT:
1531 p2p = true;
1532 internal_type = NL80211_IFTYPE_STATION;
1533 break;
1534 case NL80211_IFTYPE_P2P_GO:
1535 p2p = true;
1536 internal_type = NL80211_IFTYPE_AP;
1537 break;
1538 default:
1539 return -EBUSY;
1542 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1543 if (ret)
1544 return ret;
1546 ieee80211_do_stop(sdata, false);
1548 ieee80211_teardown_sdata(sdata);
1550 ret = drv_change_interface(local, sdata, internal_type, p2p);
1551 if (ret)
1552 type = ieee80211_vif_type_p2p(&sdata->vif);
1555 * Ignore return value here, there's not much we can do since
1556 * the driver changed the interface type internally already.
1557 * The warnings will hopefully make driver authors fix it :-)
1559 ieee80211_check_queues(sdata, type);
1561 ieee80211_setup_sdata(sdata, type);
1563 err = ieee80211_do_open(&sdata->wdev, false);
1564 WARN(err, "type change: do_open returned %d", err);
1566 return ret;
1569 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1570 enum nl80211_iftype type)
1572 int ret;
1574 ASSERT_RTNL();
1576 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1577 return 0;
1579 if (ieee80211_sdata_running(sdata)) {
1580 ret = ieee80211_runtime_change_iftype(sdata, type);
1581 if (ret)
1582 return ret;
1583 } else {
1584 /* Purge and reset type-dependent state. */
1585 ieee80211_teardown_sdata(sdata);
1586 ieee80211_setup_sdata(sdata, type);
1589 /* reset some values that shouldn't be kept across type changes */
1590 if (type == NL80211_IFTYPE_STATION)
1591 sdata->u.mgd.use_4addr = false;
1593 return 0;
1596 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1597 u8 *perm_addr, enum nl80211_iftype type)
1599 struct ieee80211_sub_if_data *sdata;
1600 u64 mask, start, addr, val, inc;
1601 u8 *m;
1602 u8 tmp_addr[ETH_ALEN];
1603 int i;
1605 /* default ... something at least */
1606 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1608 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1609 local->hw.wiphy->n_addresses <= 1)
1610 return;
1612 mutex_lock(&local->iflist_mtx);
1614 switch (type) {
1615 case NL80211_IFTYPE_MONITOR:
1616 /* doesn't matter */
1617 break;
1618 case NL80211_IFTYPE_WDS:
1619 case NL80211_IFTYPE_AP_VLAN:
1620 /* match up with an AP interface */
1621 list_for_each_entry(sdata, &local->interfaces, list) {
1622 if (sdata->vif.type != NL80211_IFTYPE_AP)
1623 continue;
1624 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1625 break;
1627 /* keep default if no AP interface present */
1628 break;
1629 case NL80211_IFTYPE_P2P_CLIENT:
1630 case NL80211_IFTYPE_P2P_GO:
1631 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1632 list_for_each_entry(sdata, &local->interfaces, list) {
1633 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1634 continue;
1635 if (!ieee80211_sdata_running(sdata))
1636 continue;
1637 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1638 goto out_unlock;
1641 /* otherwise fall through */
1642 default:
1643 /* assign a new address if possible -- try n_addresses first */
1644 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1645 bool used = false;
1647 list_for_each_entry(sdata, &local->interfaces, list) {
1648 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1649 sdata->vif.addr)) {
1650 used = true;
1651 break;
1655 if (!used) {
1656 memcpy(perm_addr,
1657 local->hw.wiphy->addresses[i].addr,
1658 ETH_ALEN);
1659 break;
1663 /* try mask if available */
1664 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1665 break;
1667 m = local->hw.wiphy->addr_mask;
1668 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1669 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1670 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1672 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1673 /* not a contiguous mask ... not handled now! */
1674 pr_info("not contiguous\n");
1675 break;
1679 * Pick address of existing interface in case user changed
1680 * MAC address manually, default to perm_addr.
1682 m = local->hw.wiphy->perm_addr;
1683 list_for_each_entry(sdata, &local->interfaces, list) {
1684 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1685 continue;
1686 m = sdata->vif.addr;
1687 break;
1689 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1690 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1691 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1693 inc = 1ULL<<__ffs64(mask);
1694 val = (start & mask);
1695 addr = (start & ~mask) | (val & mask);
1696 do {
1697 bool used = false;
1699 tmp_addr[5] = addr >> 0*8;
1700 tmp_addr[4] = addr >> 1*8;
1701 tmp_addr[3] = addr >> 2*8;
1702 tmp_addr[2] = addr >> 3*8;
1703 tmp_addr[1] = addr >> 4*8;
1704 tmp_addr[0] = addr >> 5*8;
1706 val += inc;
1708 list_for_each_entry(sdata, &local->interfaces, list) {
1709 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1710 used = true;
1711 break;
1715 if (!used) {
1716 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1717 break;
1719 addr = (start & ~mask) | (val & mask);
1720 } while (addr != start);
1722 break;
1725 out_unlock:
1726 mutex_unlock(&local->iflist_mtx);
1729 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1730 unsigned char name_assign_type,
1731 struct wireless_dev **new_wdev, enum nl80211_iftype type,
1732 struct vif_params *params)
1734 struct net_device *ndev = NULL;
1735 struct ieee80211_sub_if_data *sdata = NULL;
1736 struct txq_info *txqi;
1737 void (*if_setup)(struct net_device *dev);
1738 int ret, i;
1739 int txqs = 1;
1741 ASSERT_RTNL();
1743 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1744 struct wireless_dev *wdev;
1746 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1747 GFP_KERNEL);
1748 if (!sdata)
1749 return -ENOMEM;
1750 wdev = &sdata->wdev;
1752 sdata->dev = NULL;
1753 strlcpy(sdata->name, name, IFNAMSIZ);
1754 ieee80211_assign_perm_addr(local, wdev->address, type);
1755 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1756 } else {
1757 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1758 sizeof(void *));
1759 int txq_size = 0;
1761 if (local->ops->wake_tx_queue)
1762 txq_size += sizeof(struct txq_info) +
1763 local->hw.txq_data_size;
1765 if (local->ops->wake_tx_queue)
1766 if_setup = ieee80211_if_setup_no_queue;
1767 else
1768 if_setup = ieee80211_if_setup;
1770 if (local->hw.queues >= IEEE80211_NUM_ACS)
1771 txqs = IEEE80211_NUM_ACS;
1773 ndev = alloc_netdev_mqs(size + txq_size,
1774 name, name_assign_type,
1775 if_setup, txqs, 1);
1776 if (!ndev)
1777 return -ENOMEM;
1778 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1780 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1781 if (!ndev->tstats) {
1782 free_netdev(ndev);
1783 return -ENOMEM;
1786 ndev->needed_headroom = local->tx_headroom +
1787 4*6 /* four MAC addresses */
1788 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1789 + 6 /* mesh */
1790 + 8 /* rfc1042/bridge tunnel */
1791 - ETH_HLEN /* ethernet hard_header_len */
1792 + IEEE80211_ENCRYPT_HEADROOM;
1793 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1795 ret = dev_alloc_name(ndev, ndev->name);
1796 if (ret < 0) {
1797 ieee80211_if_free(ndev);
1798 free_netdev(ndev);
1799 return ret;
1802 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1803 if (params && is_valid_ether_addr(params->macaddr))
1804 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1805 else
1806 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1807 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1809 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1810 sdata = netdev_priv(ndev);
1811 ndev->ieee80211_ptr = &sdata->wdev;
1812 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1813 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1815 if (txq_size) {
1816 txqi = netdev_priv(ndev) + size;
1817 ieee80211_txq_init(sdata, NULL, txqi, 0);
1820 sdata->dev = ndev;
1823 /* initialise type-independent data */
1824 sdata->wdev.wiphy = local->hw.wiphy;
1825 sdata->local = local;
1827 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1828 skb_queue_head_init(&sdata->fragments[i].skb_list);
1830 INIT_LIST_HEAD(&sdata->key_list);
1832 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1833 ieee80211_dfs_cac_timer_work);
1834 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1835 ieee80211_delayed_tailroom_dec);
1837 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1838 struct ieee80211_supported_band *sband;
1839 sband = local->hw.wiphy->bands[i];
1840 sdata->rc_rateidx_mask[i] =
1841 sband ? (1 << sband->n_bitrates) - 1 : 0;
1842 if (sband) {
1843 __le16 cap;
1844 u16 *vht_rate_mask;
1846 memcpy(sdata->rc_rateidx_mcs_mask[i],
1847 sband->ht_cap.mcs.rx_mask,
1848 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1850 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1851 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1852 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1853 } else {
1854 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1855 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1856 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1857 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1861 ieee80211_set_default_queues(sdata);
1863 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1864 sdata->user_power_level = local->user_power_level;
1866 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1868 /* setup type-dependent data */
1869 ieee80211_setup_sdata(sdata, type);
1871 if (ndev) {
1872 if (params) {
1873 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1874 if (type == NL80211_IFTYPE_STATION)
1875 sdata->u.mgd.use_4addr = params->use_4addr;
1878 ndev->features |= local->hw.netdev_features;
1880 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1882 /* MTU range: 256 - 2304 */
1883 ndev->min_mtu = 256;
1884 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1886 ret = register_netdevice(ndev);
1887 if (ret) {
1888 free_netdev(ndev);
1889 return ret;
1893 mutex_lock(&local->iflist_mtx);
1894 list_add_tail_rcu(&sdata->list, &local->interfaces);
1895 mutex_unlock(&local->iflist_mtx);
1897 if (new_wdev)
1898 *new_wdev = &sdata->wdev;
1900 return 0;
1903 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1905 ASSERT_RTNL();
1907 mutex_lock(&sdata->local->iflist_mtx);
1908 list_del_rcu(&sdata->list);
1909 mutex_unlock(&sdata->local->iflist_mtx);
1911 synchronize_rcu();
1913 if (sdata->dev) {
1914 unregister_netdevice(sdata->dev);
1915 } else {
1916 cfg80211_unregister_wdev(&sdata->wdev);
1917 ieee80211_teardown_sdata(sdata);
1918 kfree(sdata);
1922 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1924 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1925 return;
1926 ieee80211_do_stop(sdata, true);
1929 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1931 struct ieee80211_sub_if_data *sdata, *tmp;
1932 LIST_HEAD(unreg_list);
1933 LIST_HEAD(wdev_list);
1935 ASSERT_RTNL();
1937 /* Before destroying the interfaces, make sure they're all stopped so
1938 * that the hardware is stopped. Otherwise, the driver might still be
1939 * iterating the interfaces during the shutdown, e.g. from a worker
1940 * or from RX processing or similar, and if it does so (using atomic
1941 * iteration) while we're manipulating the list, the iteration will
1942 * crash.
1944 * After this, the hardware should be stopped and the driver should
1945 * have stopped all of its activities, so that we can do RCU-unaware
1946 * manipulations of the interface list below.
1948 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1950 WARN(local->open_count, "%s: open count remains %d\n",
1951 wiphy_name(local->hw.wiphy), local->open_count);
1953 mutex_lock(&local->iflist_mtx);
1954 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1955 list_del(&sdata->list);
1957 if (sdata->dev)
1958 unregister_netdevice_queue(sdata->dev, &unreg_list);
1959 else
1960 list_add(&sdata->list, &wdev_list);
1962 mutex_unlock(&local->iflist_mtx);
1963 unregister_netdevice_many(&unreg_list);
1965 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1966 list_del(&sdata->list);
1967 cfg80211_unregister_wdev(&sdata->wdev);
1968 kfree(sdata);
1972 static int netdev_notify(struct notifier_block *nb,
1973 unsigned long state, void *ptr)
1975 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1976 struct ieee80211_sub_if_data *sdata;
1978 if (state != NETDEV_CHANGENAME)
1979 return NOTIFY_DONE;
1981 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1982 return NOTIFY_DONE;
1984 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1985 return NOTIFY_DONE;
1987 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1988 memcpy(sdata->name, dev->name, IFNAMSIZ);
1989 ieee80211_debugfs_rename_netdev(sdata);
1991 return NOTIFY_OK;
1994 static struct notifier_block mac80211_netdev_notifier = {
1995 .notifier_call = netdev_notify,
1998 int ieee80211_iface_init(void)
2000 return register_netdevice_notifier(&mac80211_netdev_notifier);
2003 void ieee80211_iface_exit(void)
2005 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2008 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2010 if (sdata->vif.type == NL80211_IFTYPE_AP)
2011 atomic_inc(&sdata->u.ap.num_mcast_sta);
2012 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2013 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2016 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2018 if (sdata->vif.type == NL80211_IFTYPE_AP)
2019 atomic_dec(&sdata->u.ap.num_mcast_sta);
2020 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2021 atomic_dec(&sdata->u.vlan.num_mcast_sta);