2 * Interface handling (except master interface)
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>
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.
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"
22 #include "debugfs_netdev.h"
25 #include "driver-ops.h"
29 * DOC: Interface list locking
31 * The interface list in each struct ieee80211_local is protected
34 * (1) modifications may only be done under the RTNL
35 * (2) modifications and readers are protected against each other by
37 * (3) modifications are done in an RCU manner so atomic readers
38 * can traverse the list in RCU-safe blocks.
40 * As a consequence, reads (traversals) of the list can be protected
41 * by either the RTNL, the iflist_mtx or RCU.
45 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
48 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
50 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
52 /* FIX: what would be proper limits for MTU?
53 * This interface uses 802.3 frames. */
55 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
59 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
60 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
61 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
66 static int ieee80211_change_mac(struct net_device *dev, void *addr)
68 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
69 struct sockaddr *sa = addr;
72 if (ieee80211_sdata_running(sdata))
75 ret = eth_mac_addr(dev, sa);
78 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
83 static inline int identical_mac_addr_allowed(int type1, int type2)
85 return type1 == NL80211_IFTYPE_MONITOR ||
86 type2 == NL80211_IFTYPE_MONITOR ||
87 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
88 (type1 == NL80211_IFTYPE_WDS &&
89 (type2 == NL80211_IFTYPE_WDS ||
90 type2 == NL80211_IFTYPE_AP)) ||
91 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
92 (type1 == NL80211_IFTYPE_AP_VLAN &&
93 (type2 == NL80211_IFTYPE_AP ||
94 type2 == NL80211_IFTYPE_AP_VLAN));
97 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
98 enum nl80211_iftype iftype)
100 struct ieee80211_local *local = sdata->local;
101 struct ieee80211_sub_if_data *nsdata;
102 struct net_device *dev = sdata->dev;
106 /* we hold the RTNL here so can safely walk the list */
107 list_for_each_entry(nsdata, &local->interfaces, list) {
108 struct net_device *ndev = nsdata->dev;
110 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
112 * Allow only a single IBSS interface to be up at any
113 * time. This is restricted because beacon distribution
114 * cannot work properly if both are in the same IBSS.
116 * To remove this restriction we'd have to disallow them
117 * from setting the same SSID on different IBSS interfaces
118 * belonging to the same hardware. Then, however, we're
119 * faced with having to adopt two different TSF timers...
121 if (iftype == NL80211_IFTYPE_ADHOC &&
122 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
126 * The remaining checks are only performed for interfaces
127 * with the same MAC address.
129 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
133 * check whether it may have the same address
135 if (!identical_mac_addr_allowed(iftype,
140 * can only add VLANs to enabled APs
142 if (iftype == NL80211_IFTYPE_AP_VLAN &&
143 nsdata->vif.type == NL80211_IFTYPE_AP)
144 sdata->bss = &nsdata->u.ap;
151 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
154 struct ieee80211_local *local = sdata->local;
155 u32 flags = sdata->u.mntr_flags;
157 #define ADJUST(_f, _s) do { \
158 if (flags & MONITOR_FLAG_##_f) \
159 local->fif_##_s += offset; \
162 ADJUST(FCSFAIL, fcsfail);
163 ADJUST(PLCPFAIL, plcpfail);
164 ADJUST(CONTROL, control);
165 ADJUST(CONTROL, pspoll);
166 ADJUST(OTHER_BSS, other_bss);
172 * NOTE: Be very careful when changing this function, it must NOT return
173 * an error on interface type changes that have been pre-checked, so most
174 * checks should be in ieee80211_check_concurrent_iface.
176 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
178 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
179 struct ieee80211_local *local = sdata->local;
180 struct sta_info *sta;
183 u32 hw_reconf_flags = 0;
185 switch (sdata->vif.type) {
186 case NL80211_IFTYPE_WDS:
187 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
190 case NL80211_IFTYPE_AP_VLAN:
193 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
195 case NL80211_IFTYPE_AP:
196 sdata->bss = &sdata->u.ap;
198 case NL80211_IFTYPE_MESH_POINT:
199 if (!ieee80211_vif_is_mesh(&sdata->vif))
201 /* mesh ifaces must set allmulti to forward mcast traffic */
202 atomic_inc(&local->iff_allmultis);
204 case NL80211_IFTYPE_STATION:
205 case NL80211_IFTYPE_MONITOR:
206 case NL80211_IFTYPE_ADHOC:
207 /* no special treatment */
209 case NL80211_IFTYPE_UNSPECIFIED:
210 case NUM_NL80211_IFTYPES:
211 case NL80211_IFTYPE_P2P_CLIENT:
212 case NL80211_IFTYPE_P2P_GO:
218 if (local->open_count == 0) {
219 res = drv_start(local);
222 if (local->ops->napi_poll)
223 napi_enable(&local->napi);
224 /* we're brought up, everything changes */
225 hw_reconf_flags = ~0;
226 ieee80211_led_radio(local, true);
230 * Copy the hopefully now-present MAC address to
231 * this interface, if it has the special null one.
233 if (is_zero_ether_addr(dev->dev_addr)) {
234 memcpy(dev->dev_addr,
235 local->hw.wiphy->perm_addr,
237 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
239 if (!is_valid_ether_addr(dev->dev_addr)) {
240 if (!local->open_count)
242 return -EADDRNOTAVAIL;
246 switch (sdata->vif.type) {
247 case NL80211_IFTYPE_AP_VLAN:
248 /* no need to tell driver */
250 case NL80211_IFTYPE_MONITOR:
251 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
252 local->cooked_mntrs++;
256 /* must be before the call to ieee80211_configure_filter */
258 if (local->monitors == 1) {
259 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
260 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
263 ieee80211_adjust_monitor_flags(sdata, 1);
264 ieee80211_configure_filter(local);
266 netif_carrier_on(dev);
270 res = drv_add_interface(local, &sdata->vif);
275 if (ieee80211_vif_is_mesh(&sdata->vif)) {
276 local->fif_other_bss++;
277 ieee80211_configure_filter(local);
279 ieee80211_start_mesh(sdata);
280 } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
283 ieee80211_configure_filter(local);
286 changed |= ieee80211_reset_erp_info(sdata);
287 ieee80211_bss_info_change_notify(sdata, changed);
289 if (sdata->vif.type == NL80211_IFTYPE_STATION)
290 netif_carrier_off(dev);
292 netif_carrier_on(dev);
295 set_bit(SDATA_STATE_RUNNING, &sdata->state);
297 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
298 /* Create STA entry for the WDS peer */
299 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
303 goto err_del_interface;
306 /* no locking required since STA is not live yet */
307 sta->flags |= WLAN_STA_AUTHORIZED;
309 res = sta_info_insert(sta);
311 /* STA has been freed */
312 goto err_del_interface;
317 * set_multicast_list will be invoked by the networking core
318 * which will check whether any increments here were done in
319 * error and sync them down to the hardware as filter flags.
321 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
322 atomic_inc(&local->iff_allmultis);
324 if (sdata->flags & IEEE80211_SDATA_PROMISC)
325 atomic_inc(&local->iff_promiscs);
327 mutex_lock(&local->mtx);
328 hw_reconf_flags |= __ieee80211_recalc_idle(local);
329 mutex_unlock(&local->mtx);
334 if (hw_reconf_flags) {
335 ieee80211_hw_config(local, hw_reconf_flags);
337 * set default queue parameters so drivers don't
338 * need to initialise the hardware if the hardware
339 * doesn't start up with sane defaults
341 ieee80211_set_wmm_default(sdata);
344 ieee80211_recalc_ps(local, -1);
346 netif_tx_start_all_queues(dev);
350 drv_remove_interface(local, &sdata->vif);
352 if (!local->open_count)
356 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
357 list_del(&sdata->u.vlan.list);
358 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
362 static int ieee80211_open(struct net_device *dev)
364 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
367 /* fail early if user set an invalid address */
368 if (!is_zero_ether_addr(dev->dev_addr) &&
369 !is_valid_ether_addr(dev->dev_addr))
370 return -EADDRNOTAVAIL;
372 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
376 return ieee80211_do_open(dev, true);
379 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
382 struct ieee80211_local *local = sdata->local;
384 struct sk_buff *skb, *tmp;
385 u32 hw_reconf_flags = 0;
388 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
391 * Stop TX on this interface first.
393 netif_tx_stop_all_queues(sdata->dev);
396 * Purge work for this interface.
398 ieee80211_work_purge(sdata);
401 * Remove all stations associated with this interface.
403 * This must be done before calling ops->remove_interface()
404 * because otherwise we can later invoke ops->sta_notify()
405 * whenever the STAs are removed, and that invalidates driver
406 * assumptions about always getting a vif pointer that is valid
407 * (because if we remove a STA after ops->remove_interface()
408 * the driver will have removed the vif info already!)
410 * This is relevant only in AP, WDS and mesh modes, since in
411 * all other modes we've already removed all stations when
414 sta_info_flush(local, sdata);
417 * Don't count this interface for promisc/allmulti while it
418 * is down. dev_mc_unsync() will invoke set_multicast_list
419 * on the master interface which will sync these down to the
420 * hardware as filter flags.
422 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
423 atomic_dec(&local->iff_allmultis);
425 if (sdata->flags & IEEE80211_SDATA_PROMISC)
426 atomic_dec(&local->iff_promiscs);
428 if (sdata->vif.type == NL80211_IFTYPE_AP)
431 netif_addr_lock_bh(sdata->dev);
432 spin_lock_bh(&local->filter_lock);
433 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
434 sdata->dev->addr_len);
435 spin_unlock_bh(&local->filter_lock);
436 netif_addr_unlock_bh(sdata->dev);
438 ieee80211_configure_filter(local);
440 del_timer_sync(&local->dynamic_ps_timer);
441 cancel_work_sync(&local->dynamic_ps_enable_work);
443 /* APs need special treatment */
444 if (sdata->vif.type == NL80211_IFTYPE_AP) {
445 struct ieee80211_sub_if_data *vlan, *tmpsdata;
446 struct beacon_data *old_beacon = sdata->u.ap.beacon;
448 /* sdata_running will return false, so this will disable */
449 ieee80211_bss_info_change_notify(sdata,
450 BSS_CHANGED_BEACON_ENABLED);
453 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
457 /* free all potentially still buffered bcast frames */
458 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
459 local->total_ps_buffered--;
463 /* down all dependent devices, that is VLANs */
464 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
466 dev_close(vlan->dev);
467 WARN_ON(!list_empty(&sdata->u.ap.vlans));
473 switch (sdata->vif.type) {
474 case NL80211_IFTYPE_AP_VLAN:
475 list_del(&sdata->u.vlan.list);
476 /* no need to tell driver */
478 case NL80211_IFTYPE_MONITOR:
479 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
480 local->cooked_mntrs--;
485 if (local->monitors == 0) {
486 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
487 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
490 ieee80211_adjust_monitor_flags(sdata, -1);
491 ieee80211_configure_filter(local);
493 case NL80211_IFTYPE_MESH_POINT:
494 if (ieee80211_vif_is_mesh(&sdata->vif)) {
495 /* other_bss and allmulti are always set on mesh
497 local->fif_other_bss--;
498 atomic_dec(&local->iff_allmultis);
500 ieee80211_configure_filter(local);
502 ieee80211_stop_mesh(sdata);
506 flush_work(&sdata->work);
508 * When we get here, the interface is marked down.
509 * Call synchronize_rcu() to wait for the RX path
510 * should it be using the interface and enqueuing
511 * frames at this very time on another CPU.
514 skb_queue_purge(&sdata->skb_queue);
516 if (local->scan_sdata == sdata)
517 ieee80211_scan_cancel(local);
520 * Disable beaconing here for mesh only, AP and IBSS
521 * are already taken care of.
523 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
524 ieee80211_bss_info_change_notify(sdata,
525 BSS_CHANGED_BEACON_ENABLED);
528 * Free all remaining keys, there shouldn't be any,
529 * except maybe group keys in AP more or WDS?
531 ieee80211_free_keys(sdata);
534 drv_remove_interface(local, &sdata->vif);
539 mutex_lock(&local->mtx);
540 hw_reconf_flags |= __ieee80211_recalc_idle(local);
541 mutex_unlock(&local->mtx);
543 ieee80211_recalc_ps(local, -1);
545 if (local->open_count == 0) {
546 if (local->ops->napi_poll)
547 napi_disable(&local->napi);
548 ieee80211_clear_tx_pending(local);
549 ieee80211_stop_device(local);
551 /* no reconfiguring after stop! */
555 /* do after stop to avoid reconfiguring when we stop anyway */
557 ieee80211_hw_config(local, hw_reconf_flags);
559 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
560 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
561 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
562 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
563 if (info->control.vif == &sdata->vif) {
564 __skb_unlink(skb, &local->pending[i]);
565 dev_kfree_skb_irq(skb);
569 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
572 static int ieee80211_stop(struct net_device *dev)
574 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
576 ieee80211_do_stop(sdata, true);
581 static void ieee80211_set_multicast_list(struct net_device *dev)
583 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
584 struct ieee80211_local *local = sdata->local;
585 int allmulti, promisc, sdata_allmulti, sdata_promisc;
587 allmulti = !!(dev->flags & IFF_ALLMULTI);
588 promisc = !!(dev->flags & IFF_PROMISC);
589 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
590 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
592 if (allmulti != sdata_allmulti) {
593 if (dev->flags & IFF_ALLMULTI)
594 atomic_inc(&local->iff_allmultis);
596 atomic_dec(&local->iff_allmultis);
597 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
600 if (promisc != sdata_promisc) {
601 if (dev->flags & IFF_PROMISC)
602 atomic_inc(&local->iff_promiscs);
604 atomic_dec(&local->iff_promiscs);
605 sdata->flags ^= IEEE80211_SDATA_PROMISC;
607 spin_lock_bh(&local->filter_lock);
608 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
609 spin_unlock_bh(&local->filter_lock);
610 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
614 * Called when the netdev is removed or, by the code below, before
615 * the interface type changes.
617 static void ieee80211_teardown_sdata(struct net_device *dev)
619 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
620 struct ieee80211_local *local = sdata->local;
624 /* free extra data */
625 ieee80211_free_keys(sdata);
627 ieee80211_debugfs_remove_netdev(sdata);
629 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
630 __skb_queue_purge(&sdata->fragments[i].skb_list);
631 sdata->fragment_next = 0;
633 if (ieee80211_vif_is_mesh(&sdata->vif))
634 mesh_rmc_free(sdata);
636 flushed = sta_info_flush(local, sdata);
640 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
643 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
646 static const struct net_device_ops ieee80211_dataif_ops = {
647 .ndo_open = ieee80211_open,
648 .ndo_stop = ieee80211_stop,
649 .ndo_uninit = ieee80211_teardown_sdata,
650 .ndo_start_xmit = ieee80211_subif_start_xmit,
651 .ndo_set_multicast_list = ieee80211_set_multicast_list,
652 .ndo_change_mtu = ieee80211_change_mtu,
653 .ndo_set_mac_address = ieee80211_change_mac,
654 .ndo_select_queue = ieee80211_netdev_select_queue,
657 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
660 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
661 struct ieee80211_local *local = sdata->local;
662 struct ieee80211_hdr *hdr;
663 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
666 if (local->hw.queues < 4)
670 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
671 return 0; /* doesn't matter, frame will be dropped */
673 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
675 if (!ieee80211_is_data(hdr->frame_control)) {
677 return ieee802_1d_to_ac[skb->priority];
679 if (!ieee80211_is_data_qos(hdr->frame_control)) {
681 return ieee802_1d_to_ac[skb->priority];
684 p = ieee80211_get_qos_ctl(hdr);
685 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
687 return ieee80211_downgrade_queue(local, skb);
690 static const struct net_device_ops ieee80211_monitorif_ops = {
691 .ndo_open = ieee80211_open,
692 .ndo_stop = ieee80211_stop,
693 .ndo_uninit = ieee80211_teardown_sdata,
694 .ndo_start_xmit = ieee80211_monitor_start_xmit,
695 .ndo_set_multicast_list = ieee80211_set_multicast_list,
696 .ndo_change_mtu = ieee80211_change_mtu,
697 .ndo_set_mac_address = eth_mac_addr,
698 .ndo_select_queue = ieee80211_monitor_select_queue,
701 static void ieee80211_if_setup(struct net_device *dev)
704 dev->netdev_ops = &ieee80211_dataif_ops;
705 dev->destructor = free_netdev;
708 static void ieee80211_iface_work(struct work_struct *work)
710 struct ieee80211_sub_if_data *sdata =
711 container_of(work, struct ieee80211_sub_if_data, work);
712 struct ieee80211_local *local = sdata->local;
714 struct sta_info *sta;
715 struct ieee80211_ra_tid *ra_tid;
717 if (!ieee80211_sdata_running(sdata))
724 * ieee80211_queue_work() should have picked up most cases,
725 * here we'll pick the rest.
727 if (WARN(local->suspended,
728 "interface work scheduled while going to suspend\n"))
731 /* first process frames */
732 while ((skb = skb_dequeue(&sdata->skb_queue))) {
733 struct ieee80211_mgmt *mgmt = (void *)skb->data;
735 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
736 ra_tid = (void *)&skb->cb;
737 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
739 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
740 ra_tid = (void *)&skb->cb;
741 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
743 } else if (ieee80211_is_action(mgmt->frame_control) &&
744 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
747 mutex_lock(&local->sta_mtx);
748 sta = sta_info_get_bss(sdata, mgmt->sa);
750 switch (mgmt->u.action.u.addba_req.action_code) {
751 case WLAN_ACTION_ADDBA_REQ:
752 ieee80211_process_addba_request(
753 local, sta, mgmt, len);
755 case WLAN_ACTION_ADDBA_RESP:
756 ieee80211_process_addba_resp(local, sta,
759 case WLAN_ACTION_DELBA:
760 ieee80211_process_delba(sdata, sta,
768 mutex_unlock(&local->sta_mtx);
769 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
770 struct ieee80211_hdr *hdr = (void *)mgmt;
772 * So the frame isn't mgmt, but frame_control
773 * is at the right place anyway, of course, so
774 * the if statement is correct.
776 * Warn if we have other data frame types here,
777 * they must not get here.
779 WARN_ON(hdr->frame_control &
780 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
781 WARN_ON(!(hdr->seq_ctrl &
782 cpu_to_le16(IEEE80211_SCTL_FRAG)));
784 * This was a fragment of a frame, received while
785 * a block-ack session was active. That cannot be
786 * right, so terminate the session.
788 mutex_lock(&local->sta_mtx);
789 sta = sta_info_get_bss(sdata, mgmt->sa);
791 u16 tid = *ieee80211_get_qos_ctl(hdr) &
792 IEEE80211_QOS_CTL_TID_MASK;
794 __ieee80211_stop_rx_ba_session(
795 sta, tid, WLAN_BACK_RECIPIENT,
796 WLAN_REASON_QSTA_REQUIRE_SETUP);
798 mutex_unlock(&local->sta_mtx);
799 } else switch (sdata->vif.type) {
800 case NL80211_IFTYPE_STATION:
801 ieee80211_sta_rx_queued_mgmt(sdata, skb);
803 case NL80211_IFTYPE_ADHOC:
804 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
806 case NL80211_IFTYPE_MESH_POINT:
807 if (!ieee80211_vif_is_mesh(&sdata->vif))
809 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
812 WARN(1, "frame for unexpected interface type");
819 /* then other type-dependent work */
820 switch (sdata->vif.type) {
821 case NL80211_IFTYPE_STATION:
822 ieee80211_sta_work(sdata);
824 case NL80211_IFTYPE_ADHOC:
825 ieee80211_ibss_work(sdata);
827 case NL80211_IFTYPE_MESH_POINT:
828 if (!ieee80211_vif_is_mesh(&sdata->vif))
830 ieee80211_mesh_work(sdata);
839 * Helper function to initialise an interface to a specific type.
841 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
842 enum nl80211_iftype type)
844 /* clear type-dependent union */
845 memset(&sdata->u, 0, sizeof(sdata->u));
847 /* and set some type-dependent values */
848 sdata->vif.type = type;
849 sdata->vif.p2p = false;
850 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
851 sdata->wdev.iftype = type;
853 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
854 sdata->control_port_no_encrypt = false;
856 /* only monitor differs */
857 sdata->dev->type = ARPHRD_ETHER;
859 skb_queue_head_init(&sdata->skb_queue);
860 INIT_WORK(&sdata->work, ieee80211_iface_work);
863 case NL80211_IFTYPE_P2P_GO:
864 type = NL80211_IFTYPE_AP;
865 sdata->vif.type = type;
866 sdata->vif.p2p = true;
868 case NL80211_IFTYPE_AP:
869 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
870 INIT_LIST_HEAD(&sdata->u.ap.vlans);
872 case NL80211_IFTYPE_P2P_CLIENT:
873 type = NL80211_IFTYPE_STATION;
874 sdata->vif.type = type;
875 sdata->vif.p2p = true;
877 case NL80211_IFTYPE_STATION:
878 ieee80211_sta_setup_sdata(sdata);
880 case NL80211_IFTYPE_ADHOC:
881 ieee80211_ibss_setup_sdata(sdata);
883 case NL80211_IFTYPE_MESH_POINT:
884 if (ieee80211_vif_is_mesh(&sdata->vif))
885 ieee80211_mesh_init_sdata(sdata);
887 case NL80211_IFTYPE_MONITOR:
888 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
889 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
890 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
891 MONITOR_FLAG_OTHER_BSS;
893 case NL80211_IFTYPE_WDS:
894 case NL80211_IFTYPE_AP_VLAN:
896 case NL80211_IFTYPE_UNSPECIFIED:
897 case NUM_NL80211_IFTYPES:
902 ieee80211_debugfs_add_netdev(sdata);
905 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
906 enum nl80211_iftype type)
908 struct ieee80211_local *local = sdata->local;
910 enum nl80211_iftype internal_type = type;
915 if (!local->ops->change_interface)
918 switch (sdata->vif.type) {
919 case NL80211_IFTYPE_AP:
920 case NL80211_IFTYPE_STATION:
921 case NL80211_IFTYPE_ADHOC:
923 * Could maybe also all others here?
924 * Just not sure how that interacts
925 * with the RX/config path e.g. for
934 case NL80211_IFTYPE_AP:
935 case NL80211_IFTYPE_STATION:
936 case NL80211_IFTYPE_ADHOC:
938 * Could probably support everything
939 * but WDS here (WDS do_open can fail
940 * under memory pressure, which this
941 * code isn't prepared to handle).
944 case NL80211_IFTYPE_P2P_CLIENT:
946 internal_type = NL80211_IFTYPE_STATION;
948 case NL80211_IFTYPE_P2P_GO:
950 internal_type = NL80211_IFTYPE_AP;
956 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
960 ieee80211_do_stop(sdata, false);
962 ieee80211_teardown_sdata(sdata->dev);
964 ret = drv_change_interface(local, sdata, internal_type, p2p);
966 type = sdata->vif.type;
968 ieee80211_setup_sdata(sdata, type);
970 err = ieee80211_do_open(sdata->dev, false);
971 WARN(err, "type change: do_open returned %d", err);
976 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
977 enum nl80211_iftype type)
983 if (type == ieee80211_vif_type_p2p(&sdata->vif))
986 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
987 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
988 type == NL80211_IFTYPE_ADHOC)
991 if (ieee80211_sdata_running(sdata)) {
992 ret = ieee80211_runtime_change_iftype(sdata, type);
996 /* Purge and reset type-dependent state. */
997 ieee80211_teardown_sdata(sdata->dev);
998 ieee80211_setup_sdata(sdata, type);
1001 /* reset some values that shouldn't be kept across type changes */
1002 sdata->vif.bss_conf.basic_rates =
1003 ieee80211_mandatory_rates(sdata->local,
1004 sdata->local->hw.conf.channel->band);
1005 sdata->drop_unencrypted = 0;
1006 if (type == NL80211_IFTYPE_STATION)
1007 sdata->u.mgd.use_4addr = false;
1012 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1013 struct net_device *dev,
1014 enum nl80211_iftype type)
1016 struct ieee80211_sub_if_data *sdata;
1017 u64 mask, start, addr, val, inc;
1019 u8 tmp_addr[ETH_ALEN];
1022 /* default ... something at least */
1023 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1025 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1026 local->hw.wiphy->n_addresses <= 1)
1030 mutex_lock(&local->iflist_mtx);
1033 case NL80211_IFTYPE_MONITOR:
1034 /* doesn't matter */
1036 case NL80211_IFTYPE_WDS:
1037 case NL80211_IFTYPE_AP_VLAN:
1038 /* match up with an AP interface */
1039 list_for_each_entry(sdata, &local->interfaces, list) {
1040 if (sdata->vif.type != NL80211_IFTYPE_AP)
1042 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1045 /* keep default if no AP interface present */
1048 /* assign a new address if possible -- try n_addresses first */
1049 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1052 list_for_each_entry(sdata, &local->interfaces, list) {
1053 if (memcmp(local->hw.wiphy->addresses[i].addr,
1054 sdata->vif.addr, ETH_ALEN) == 0) {
1061 memcpy(dev->perm_addr,
1062 local->hw.wiphy->addresses[i].addr,
1068 /* try mask if available */
1069 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1072 m = local->hw.wiphy->addr_mask;
1073 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1074 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1075 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1077 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1078 /* not a contiguous mask ... not handled now! */
1079 printk(KERN_DEBUG "not contiguous\n");
1083 m = local->hw.wiphy->perm_addr;
1084 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1085 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1086 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1088 inc = 1ULL<<__ffs64(mask);
1089 val = (start & mask);
1090 addr = (start & ~mask) | (val & mask);
1094 tmp_addr[5] = addr >> 0*8;
1095 tmp_addr[4] = addr >> 1*8;
1096 tmp_addr[3] = addr >> 2*8;
1097 tmp_addr[2] = addr >> 3*8;
1098 tmp_addr[1] = addr >> 4*8;
1099 tmp_addr[0] = addr >> 5*8;
1103 list_for_each_entry(sdata, &local->interfaces, list) {
1104 if (memcmp(tmp_addr, sdata->vif.addr,
1112 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1115 addr = (start & ~mask) | (val & mask);
1116 } while (addr != start);
1121 mutex_unlock(&local->iflist_mtx);
1124 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1125 struct net_device **new_dev, enum nl80211_iftype type,
1126 struct vif_params *params)
1128 struct net_device *ndev;
1129 struct ieee80211_sub_if_data *sdata = NULL;
1134 ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
1135 name, ieee80211_if_setup, local->hw.queues);
1138 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1140 ndev->needed_headroom = local->tx_headroom +
1141 4*6 /* four MAC addresses */
1142 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1144 + 8 /* rfc1042/bridge tunnel */
1145 - ETH_HLEN /* ethernet hard_header_len */
1146 + IEEE80211_ENCRYPT_HEADROOM;
1147 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1149 ret = dev_alloc_name(ndev, ndev->name);
1153 ieee80211_assign_perm_addr(local, ndev, type);
1154 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1155 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1157 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1158 sdata = netdev_priv(ndev);
1159 ndev->ieee80211_ptr = &sdata->wdev;
1160 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1161 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1163 /* initialise type-independent data */
1164 sdata->wdev.wiphy = local->hw.wiphy;
1165 sdata->local = local;
1168 sdata->arp_filter_state = true;
1171 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1172 skb_queue_head_init(&sdata->fragments[i].skb_list);
1174 INIT_LIST_HEAD(&sdata->key_list);
1176 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1177 struct ieee80211_supported_band *sband;
1178 sband = local->hw.wiphy->bands[i];
1179 sdata->rc_rateidx_mask[i] =
1180 sband ? (1 << sband->n_bitrates) - 1 : 0;
1183 /* setup type-dependent data */
1184 ieee80211_setup_sdata(sdata, type);
1187 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1188 if (type == NL80211_IFTYPE_STATION)
1189 sdata->u.mgd.use_4addr = params->use_4addr;
1192 ret = register_netdevice(ndev);
1196 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1197 params && params->mesh_id_len)
1198 ieee80211_sdata_set_mesh_id(sdata,
1199 params->mesh_id_len,
1202 mutex_lock(&local->iflist_mtx);
1203 list_add_tail_rcu(&sdata->list, &local->interfaces);
1204 mutex_unlock(&local->iflist_mtx);
1216 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1220 mutex_lock(&sdata->local->iflist_mtx);
1221 list_del_rcu(&sdata->list);
1222 mutex_unlock(&sdata->local->iflist_mtx);
1225 unregister_netdevice(sdata->dev);
1229 * Remove all interfaces, may only be called at hardware unregistration
1230 * time because it doesn't do RCU-safe list removals.
1232 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1234 struct ieee80211_sub_if_data *sdata, *tmp;
1235 LIST_HEAD(unreg_list);
1239 mutex_lock(&local->iflist_mtx);
1240 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1241 list_del(&sdata->list);
1243 unregister_netdevice_queue(sdata->dev, &unreg_list);
1245 mutex_unlock(&local->iflist_mtx);
1246 unregister_netdevice_many(&unreg_list);
1249 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1252 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1255 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1256 wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1259 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1260 return IEEE80211_CONF_CHANGE_IDLE;
1263 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1265 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1268 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1269 wiphy_debug(local->hw.wiphy, "device now idle\n");
1272 drv_flush(local, false);
1274 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1275 return IEEE80211_CONF_CHANGE_IDLE;
1278 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1280 struct ieee80211_sub_if_data *sdata;
1282 bool working = false, scanning = false;
1283 struct ieee80211_work *wk;
1285 #ifdef CONFIG_PROVE_LOCKING
1286 WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1287 !lockdep_is_held(&local->iflist_mtx));
1289 lockdep_assert_held(&local->mtx);
1291 list_for_each_entry(sdata, &local->interfaces, list) {
1292 if (!ieee80211_sdata_running(sdata)) {
1293 sdata->vif.bss_conf.idle = true;
1297 sdata->old_idle = sdata->vif.bss_conf.idle;
1299 /* do not count disabled managed interfaces */
1300 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1301 !sdata->u.mgd.associated) {
1302 sdata->vif.bss_conf.idle = true;
1305 /* do not count unused IBSS interfaces */
1306 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1307 !sdata->u.ibss.ssid_len) {
1308 sdata->vif.bss_conf.idle = true;
1311 /* count everything else */
1315 list_for_each_entry(wk, &local->work_list, list) {
1317 wk->sdata->vif.bss_conf.idle = false;
1320 if (local->scan_sdata) {
1322 local->scan_sdata->vif.bss_conf.idle = false;
1325 list_for_each_entry(sdata, &local->interfaces, list) {
1326 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1328 if (!ieee80211_sdata_running(sdata))
1330 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1334 return ieee80211_idle_off(local, "working");
1336 return ieee80211_idle_off(local, "scanning");
1338 return ieee80211_idle_on(local);
1340 return ieee80211_idle_off(local, "in use");
1345 void ieee80211_recalc_idle(struct ieee80211_local *local)
1349 mutex_lock(&local->iflist_mtx);
1350 chg = __ieee80211_recalc_idle(local);
1351 mutex_unlock(&local->iflist_mtx);
1353 ieee80211_hw_config(local, chg);
1356 static int netdev_notify(struct notifier_block *nb,
1357 unsigned long state,
1360 struct net_device *dev = ndev;
1361 struct ieee80211_sub_if_data *sdata;
1363 if (state != NETDEV_CHANGENAME)
1366 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1369 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1372 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1374 memcpy(sdata->name, dev->name, IFNAMSIZ);
1376 ieee80211_debugfs_rename_netdev(sdata);
1380 static struct notifier_block mac80211_netdev_notifier = {
1381 .notifier_call = netdev_notify,
1384 int ieee80211_iface_init(void)
1386 return register_netdevice_notifier(&mac80211_netdev_notifier);
1389 void ieee80211_iface_exit(void)
1391 unregister_netdevice_notifier(&mac80211_netdev_notifier);