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"
30 * DOC: Interface list locking
32 * The interface list in each struct ieee80211_local is protected
35 * (1) modifications may only be done under the RTNL
36 * (2) modifications and readers are protected against each other by
38 * (3) modifications are done in an RCU manner so atomic readers
39 * can traverse the list in RCU-safe blocks.
41 * As a consequence, reads (traversals) of the list can be protected
42 * by either the RTNL, the iflist_mtx or RCU.
46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
49 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
51 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
53 /* FIX: what would be proper limits for MTU?
54 * This interface uses 802.3 frames. */
56 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
61 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
69 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
70 struct sockaddr *sa = addr;
73 if (ieee80211_sdata_running(sdata))
76 ret = eth_mac_addr(dev, sa);
79 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
84 static inline int identical_mac_addr_allowed(int type1, int type2)
86 return type1 == NL80211_IFTYPE_MONITOR ||
87 type2 == NL80211_IFTYPE_MONITOR ||
88 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
89 (type1 == NL80211_IFTYPE_WDS &&
90 (type2 == NL80211_IFTYPE_WDS ||
91 type2 == NL80211_IFTYPE_AP)) ||
92 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
93 (type1 == NL80211_IFTYPE_AP_VLAN &&
94 (type2 == NL80211_IFTYPE_AP ||
95 type2 == NL80211_IFTYPE_AP_VLAN));
98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
99 enum nl80211_iftype iftype)
101 struct ieee80211_local *local = sdata->local;
102 struct ieee80211_sub_if_data *nsdata;
103 struct net_device *dev = sdata->dev;
107 /* we hold the RTNL here so can safely walk the list */
108 list_for_each_entry(nsdata, &local->interfaces, list) {
109 struct net_device *ndev = nsdata->dev;
111 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
113 * Allow only a single IBSS interface to be up at any
114 * time. This is restricted because beacon distribution
115 * cannot work properly if both are in the same IBSS.
117 * To remove this restriction we'd have to disallow them
118 * from setting the same SSID on different IBSS interfaces
119 * belonging to the same hardware. Then, however, we're
120 * faced with having to adopt two different TSF timers...
122 if (iftype == NL80211_IFTYPE_ADHOC &&
123 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
127 * The remaining checks are only performed for interfaces
128 * with the same MAC address.
130 if (!ether_addr_equal(dev->dev_addr, ndev->dev_addr))
134 * check whether it may have the same address
136 if (!identical_mac_addr_allowed(iftype,
141 * can only add VLANs to enabled APs
143 if (iftype == NL80211_IFTYPE_AP_VLAN &&
144 nsdata->vif.type == NL80211_IFTYPE_AP)
145 sdata->bss = &nsdata->u.ap;
152 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
154 int n_queues = sdata->local->hw.queues;
157 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
158 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
159 IEEE80211_INVAL_HW_QUEUE))
161 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
166 if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
167 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
168 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
172 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
175 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
181 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
184 struct ieee80211_local *local = sdata->local;
185 u32 flags = sdata->u.mntr_flags;
187 #define ADJUST(_f, _s) do { \
188 if (flags & MONITOR_FLAG_##_f) \
189 local->fif_##_s += offset; \
192 ADJUST(FCSFAIL, fcsfail);
193 ADJUST(PLCPFAIL, plcpfail);
194 ADJUST(CONTROL, control);
195 ADJUST(CONTROL, pspoll);
196 ADJUST(OTHER_BSS, other_bss);
201 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
203 struct ieee80211_local *local = sdata->local;
206 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
207 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
208 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
210 sdata->vif.hw_queue[i] = i;
212 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
215 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
217 struct ieee80211_sub_if_data *sdata;
220 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
223 if (local->monitor_sdata)
226 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
231 sdata->local = local;
232 sdata->vif.type = NL80211_IFTYPE_MONITOR;
233 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
234 wiphy_name(local->hw.wiphy));
236 ieee80211_set_default_queues(sdata);
238 ret = drv_add_interface(local, sdata);
240 /* ok .. stupid driver, it asked for this! */
245 ret = ieee80211_check_queues(sdata);
251 rcu_assign_pointer(local->monitor_sdata, sdata);
256 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
258 struct ieee80211_sub_if_data *sdata;
260 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
263 sdata = rtnl_dereference(local->monitor_sdata);
268 rcu_assign_pointer(local->monitor_sdata, NULL);
271 drv_remove_interface(local, sdata);
277 * NOTE: Be very careful when changing this function, it must NOT return
278 * an error on interface type changes that have been pre-checked, so most
279 * checks should be in ieee80211_check_concurrent_iface.
281 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
283 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
284 struct ieee80211_local *local = sdata->local;
285 struct sta_info *sta;
288 u32 hw_reconf_flags = 0;
290 switch (sdata->vif.type) {
291 case NL80211_IFTYPE_WDS:
292 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
295 case NL80211_IFTYPE_AP_VLAN: {
296 struct ieee80211_sub_if_data *master;
301 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
303 master = container_of(sdata->bss,
304 struct ieee80211_sub_if_data, u.ap);
305 sdata->control_port_protocol =
306 master->control_port_protocol;
307 sdata->control_port_no_encrypt =
308 master->control_port_no_encrypt;
311 case NL80211_IFTYPE_AP:
312 sdata->bss = &sdata->u.ap;
314 case NL80211_IFTYPE_MESH_POINT:
315 case NL80211_IFTYPE_STATION:
316 case NL80211_IFTYPE_MONITOR:
317 case NL80211_IFTYPE_ADHOC:
318 /* no special treatment */
320 case NL80211_IFTYPE_UNSPECIFIED:
321 case NUM_NL80211_IFTYPES:
322 case NL80211_IFTYPE_P2P_CLIENT:
323 case NL80211_IFTYPE_P2P_GO:
329 if (local->open_count == 0) {
330 res = drv_start(local);
333 if (local->ops->napi_poll)
334 napi_enable(&local->napi);
335 /* we're brought up, everything changes */
336 hw_reconf_flags = ~0;
337 ieee80211_led_radio(local, true);
338 ieee80211_mod_tpt_led_trig(local,
339 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
343 * Copy the hopefully now-present MAC address to
344 * this interface, if it has the special null one.
346 if (is_zero_ether_addr(dev->dev_addr)) {
347 memcpy(dev->dev_addr,
348 local->hw.wiphy->perm_addr,
350 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
352 if (!is_valid_ether_addr(dev->dev_addr)) {
353 res = -EADDRNOTAVAIL;
358 switch (sdata->vif.type) {
359 case NL80211_IFTYPE_AP_VLAN:
360 /* no need to tell driver, but set carrier */
361 if (rtnl_dereference(sdata->bss->beacon))
362 netif_carrier_on(dev);
364 netif_carrier_off(dev);
366 case NL80211_IFTYPE_MONITOR:
367 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
368 local->cooked_mntrs++;
372 if (local->monitors == 0 && local->open_count == 0) {
373 res = ieee80211_add_virtual_monitor(local);
378 /* must be before the call to ieee80211_configure_filter */
380 if (local->monitors == 1) {
381 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
382 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
385 ieee80211_adjust_monitor_flags(sdata, 1);
386 ieee80211_configure_filter(local);
388 netif_carrier_on(dev);
392 ieee80211_del_virtual_monitor(local);
394 res = drv_add_interface(local, sdata);
397 res = ieee80211_check_queues(sdata);
399 goto err_del_interface;
402 if (sdata->vif.type == NL80211_IFTYPE_AP) {
404 local->fif_probe_req++;
406 ieee80211_configure_filter(local);
407 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
408 local->fif_probe_req++;
411 changed |= ieee80211_reset_erp_info(sdata);
412 ieee80211_bss_info_change_notify(sdata, changed);
414 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
415 sdata->vif.type == NL80211_IFTYPE_ADHOC ||
416 sdata->vif.type == NL80211_IFTYPE_AP)
417 netif_carrier_off(dev);
419 netif_carrier_on(dev);
422 * set default queue parameters so drivers don't
423 * need to initialise the hardware if the hardware
424 * doesn't start up with sane defaults
426 ieee80211_set_wmm_default(sdata, true);
429 set_bit(SDATA_STATE_RUNNING, &sdata->state);
431 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
432 /* Create STA entry for the WDS peer */
433 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
437 goto err_del_interface;
440 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
441 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
442 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
444 res = sta_info_insert(sta);
446 /* STA has been freed */
447 goto err_del_interface;
450 rate_control_rate_init(sta);
454 * set_multicast_list will be invoked by the networking core
455 * which will check whether any increments here were done in
456 * error and sync them down to the hardware as filter flags.
458 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
459 atomic_inc(&local->iff_allmultis);
461 if (sdata->flags & IEEE80211_SDATA_PROMISC)
462 atomic_inc(&local->iff_promiscs);
464 mutex_lock(&local->mtx);
465 hw_reconf_flags |= __ieee80211_recalc_idle(local);
466 mutex_unlock(&local->mtx);
472 ieee80211_hw_config(local, hw_reconf_flags);
474 ieee80211_recalc_ps(local, -1);
476 netif_tx_start_all_queues(dev);
480 drv_remove_interface(local, sdata);
482 if (!local->open_count)
486 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
487 list_del(&sdata->u.vlan.list);
488 /* might already be clear but that doesn't matter */
489 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
493 static int ieee80211_open(struct net_device *dev)
495 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
498 /* fail early if user set an invalid address */
499 if (!is_valid_ether_addr(dev->dev_addr))
500 return -EADDRNOTAVAIL;
502 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
506 return ieee80211_do_open(dev, true);
509 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
512 struct ieee80211_local *local = sdata->local;
514 struct sk_buff *skb, *tmp;
515 u32 hw_reconf_flags = 0;
517 enum nl80211_channel_type orig_ct;
519 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
521 if (local->scan_sdata == sdata)
522 ieee80211_scan_cancel(local);
525 * Stop TX on this interface first.
527 netif_tx_stop_all_queues(sdata->dev);
530 * Purge work for this interface.
532 ieee80211_work_purge(sdata);
535 * Remove all stations associated with this interface.
537 * This must be done before calling ops->remove_interface()
538 * because otherwise we can later invoke ops->sta_notify()
539 * whenever the STAs are removed, and that invalidates driver
540 * assumptions about always getting a vif pointer that is valid
541 * (because if we remove a STA after ops->remove_interface()
542 * the driver will have removed the vif info already!)
544 * This is relevant only in AP, WDS and mesh modes, since in
545 * all other modes we've already removed all stations when
548 sta_info_flush(local, sdata);
551 * Don't count this interface for promisc/allmulti while it
552 * is down. dev_mc_unsync() will invoke set_multicast_list
553 * on the master interface which will sync these down to the
554 * hardware as filter flags.
556 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
557 atomic_dec(&local->iff_allmultis);
559 if (sdata->flags & IEEE80211_SDATA_PROMISC)
560 atomic_dec(&local->iff_promiscs);
562 if (sdata->vif.type == NL80211_IFTYPE_AP) {
564 local->fif_probe_req--;
565 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
566 local->fif_probe_req--;
569 netif_addr_lock_bh(sdata->dev);
570 spin_lock_bh(&local->filter_lock);
571 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
572 sdata->dev->addr_len);
573 spin_unlock_bh(&local->filter_lock);
574 netif_addr_unlock_bh(sdata->dev);
576 ieee80211_configure_filter(local);
578 del_timer_sync(&local->dynamic_ps_timer);
579 cancel_work_sync(&local->dynamic_ps_enable_work);
581 /* APs need special treatment */
582 if (sdata->vif.type == NL80211_IFTYPE_AP) {
583 struct ieee80211_sub_if_data *vlan, *tmpsdata;
584 struct beacon_data *old_beacon =
585 rtnl_dereference(sdata->u.ap.beacon);
586 struct sk_buff *old_probe_resp =
587 rtnl_dereference(sdata->u.ap.probe_resp);
589 /* sdata_running will return false, so this will disable */
590 ieee80211_bss_info_change_notify(sdata,
591 BSS_CHANGED_BEACON_ENABLED);
593 /* remove beacon and probe response */
594 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
595 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
598 kfree_skb(old_probe_resp);
600 /* down all dependent devices, that is VLANs */
601 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
603 dev_close(vlan->dev);
604 WARN_ON(!list_empty(&sdata->u.ap.vlans));
606 /* free all potentially still buffered bcast frames */
607 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
608 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
609 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
610 ieee80211_mgd_stop(sdata);
616 switch (sdata->vif.type) {
617 case NL80211_IFTYPE_AP_VLAN:
618 list_del(&sdata->u.vlan.list);
619 /* no need to tell driver */
621 case NL80211_IFTYPE_MONITOR:
622 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
623 local->cooked_mntrs--;
628 if (local->monitors == 0) {
629 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
630 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
631 ieee80211_del_virtual_monitor(local);
634 ieee80211_adjust_monitor_flags(sdata, -1);
635 ieee80211_configure_filter(local);
638 flush_work(&sdata->work);
640 * When we get here, the interface is marked down.
641 * Call synchronize_rcu() to wait for the RX path
642 * should it be using the interface and enqueuing
643 * frames at this very time on another CPU.
646 skb_queue_purge(&sdata->skb_queue);
649 * Disable beaconing here for mesh only, AP and IBSS
650 * are already taken care of.
652 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
653 ieee80211_bss_info_change_notify(sdata,
654 BSS_CHANGED_BEACON_ENABLED);
657 * Free all remaining keys, there shouldn't be any,
658 * except maybe group keys in AP more or WDS?
660 ieee80211_free_keys(sdata);
663 drv_remove_interface(local, sdata);
668 mutex_lock(&local->mtx);
669 hw_reconf_flags |= __ieee80211_recalc_idle(local);
670 mutex_unlock(&local->mtx);
672 ieee80211_recalc_ps(local, -1);
674 if (local->open_count == 0) {
675 if (local->ops->napi_poll)
676 napi_disable(&local->napi);
677 ieee80211_clear_tx_pending(local);
678 ieee80211_stop_device(local);
680 /* no reconfiguring after stop! */
684 /* Re-calculate channel-type, in case there are multiple vifs
685 * on different channel types.
687 orig_ct = local->_oper_channel_type;
688 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
690 /* do after stop to avoid reconfiguring when we stop anyway */
691 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
692 ieee80211_hw_config(local, hw_reconf_flags);
694 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
695 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
696 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
697 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
698 if (info->control.vif == &sdata->vif) {
699 __skb_unlink(skb, &local->pending[i]);
700 dev_kfree_skb_irq(skb);
704 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
706 if (local->monitors == local->open_count && local->monitors > 0)
707 ieee80211_add_virtual_monitor(local);
710 static int ieee80211_stop(struct net_device *dev)
712 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
714 ieee80211_do_stop(sdata, true);
719 static void ieee80211_set_multicast_list(struct net_device *dev)
721 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
722 struct ieee80211_local *local = sdata->local;
723 int allmulti, promisc, sdata_allmulti, sdata_promisc;
725 allmulti = !!(dev->flags & IFF_ALLMULTI);
726 promisc = !!(dev->flags & IFF_PROMISC);
727 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
728 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
730 if (allmulti != sdata_allmulti) {
731 if (dev->flags & IFF_ALLMULTI)
732 atomic_inc(&local->iff_allmultis);
734 atomic_dec(&local->iff_allmultis);
735 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
738 if (promisc != sdata_promisc) {
739 if (dev->flags & IFF_PROMISC)
740 atomic_inc(&local->iff_promiscs);
742 atomic_dec(&local->iff_promiscs);
743 sdata->flags ^= IEEE80211_SDATA_PROMISC;
745 spin_lock_bh(&local->filter_lock);
746 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
747 spin_unlock_bh(&local->filter_lock);
748 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
752 * Called when the netdev is removed or, by the code below, before
753 * the interface type changes.
755 static void ieee80211_teardown_sdata(struct net_device *dev)
757 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
758 struct ieee80211_local *local = sdata->local;
762 /* free extra data */
763 ieee80211_free_keys(sdata);
765 ieee80211_debugfs_remove_netdev(sdata);
767 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
768 __skb_queue_purge(&sdata->fragments[i].skb_list);
769 sdata->fragment_next = 0;
771 if (ieee80211_vif_is_mesh(&sdata->vif))
772 mesh_rmc_free(sdata);
774 flushed = sta_info_flush(local, sdata);
778 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
781 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
784 static const struct net_device_ops ieee80211_dataif_ops = {
785 .ndo_open = ieee80211_open,
786 .ndo_stop = ieee80211_stop,
787 .ndo_uninit = ieee80211_teardown_sdata,
788 .ndo_start_xmit = ieee80211_subif_start_xmit,
789 .ndo_set_rx_mode = ieee80211_set_multicast_list,
790 .ndo_change_mtu = ieee80211_change_mtu,
791 .ndo_set_mac_address = ieee80211_change_mac,
792 .ndo_select_queue = ieee80211_netdev_select_queue,
795 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
798 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
799 struct ieee80211_local *local = sdata->local;
800 struct ieee80211_hdr *hdr;
801 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
803 if (local->hw.queues < IEEE80211_NUM_ACS)
807 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
808 return 0; /* doesn't matter, frame will be dropped */
810 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
812 return ieee80211_select_queue_80211(local, skb, hdr);
815 static const struct net_device_ops ieee80211_monitorif_ops = {
816 .ndo_open = ieee80211_open,
817 .ndo_stop = ieee80211_stop,
818 .ndo_uninit = ieee80211_teardown_sdata,
819 .ndo_start_xmit = ieee80211_monitor_start_xmit,
820 .ndo_set_rx_mode = ieee80211_set_multicast_list,
821 .ndo_change_mtu = ieee80211_change_mtu,
822 .ndo_set_mac_address = eth_mac_addr,
823 .ndo_select_queue = ieee80211_monitor_select_queue,
826 static void ieee80211_if_setup(struct net_device *dev)
829 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
830 dev->netdev_ops = &ieee80211_dataif_ops;
831 dev->destructor = free_netdev;
834 static void ieee80211_iface_work(struct work_struct *work)
836 struct ieee80211_sub_if_data *sdata =
837 container_of(work, struct ieee80211_sub_if_data, work);
838 struct ieee80211_local *local = sdata->local;
840 struct sta_info *sta;
841 struct ieee80211_ra_tid *ra_tid;
843 if (!ieee80211_sdata_running(sdata))
850 * ieee80211_queue_work() should have picked up most cases,
851 * here we'll pick the rest.
853 if (WARN(local->suspended,
854 "interface work scheduled while going to suspend\n"))
857 /* first process frames */
858 while ((skb = skb_dequeue(&sdata->skb_queue))) {
859 struct ieee80211_mgmt *mgmt = (void *)skb->data;
861 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
862 ra_tid = (void *)&skb->cb;
863 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
865 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
866 ra_tid = (void *)&skb->cb;
867 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
869 } else if (ieee80211_is_action(mgmt->frame_control) &&
870 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
873 mutex_lock(&local->sta_mtx);
874 sta = sta_info_get_bss(sdata, mgmt->sa);
876 switch (mgmt->u.action.u.addba_req.action_code) {
877 case WLAN_ACTION_ADDBA_REQ:
878 ieee80211_process_addba_request(
879 local, sta, mgmt, len);
881 case WLAN_ACTION_ADDBA_RESP:
882 ieee80211_process_addba_resp(local, sta,
885 case WLAN_ACTION_DELBA:
886 ieee80211_process_delba(sdata, sta,
894 mutex_unlock(&local->sta_mtx);
895 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
896 struct ieee80211_hdr *hdr = (void *)mgmt;
898 * So the frame isn't mgmt, but frame_control
899 * is at the right place anyway, of course, so
900 * the if statement is correct.
902 * Warn if we have other data frame types here,
903 * they must not get here.
905 WARN_ON(hdr->frame_control &
906 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
907 WARN_ON(!(hdr->seq_ctrl &
908 cpu_to_le16(IEEE80211_SCTL_FRAG)));
910 * This was a fragment of a frame, received while
911 * a block-ack session was active. That cannot be
912 * right, so terminate the session.
914 mutex_lock(&local->sta_mtx);
915 sta = sta_info_get_bss(sdata, mgmt->sa);
917 u16 tid = *ieee80211_get_qos_ctl(hdr) &
918 IEEE80211_QOS_CTL_TID_MASK;
920 __ieee80211_stop_rx_ba_session(
921 sta, tid, WLAN_BACK_RECIPIENT,
922 WLAN_REASON_QSTA_REQUIRE_SETUP,
925 mutex_unlock(&local->sta_mtx);
926 } else switch (sdata->vif.type) {
927 case NL80211_IFTYPE_STATION:
928 ieee80211_sta_rx_queued_mgmt(sdata, skb);
930 case NL80211_IFTYPE_ADHOC:
931 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
933 case NL80211_IFTYPE_MESH_POINT:
934 if (!ieee80211_vif_is_mesh(&sdata->vif))
936 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
939 WARN(1, "frame for unexpected interface type");
946 /* then other type-dependent work */
947 switch (sdata->vif.type) {
948 case NL80211_IFTYPE_STATION:
949 ieee80211_sta_work(sdata);
951 case NL80211_IFTYPE_ADHOC:
952 ieee80211_ibss_work(sdata);
954 case NL80211_IFTYPE_MESH_POINT:
955 if (!ieee80211_vif_is_mesh(&sdata->vif))
957 ieee80211_mesh_work(sdata);
966 * Helper function to initialise an interface to a specific type.
968 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
969 enum nl80211_iftype type)
971 /* clear type-dependent union */
972 memset(&sdata->u, 0, sizeof(sdata->u));
974 /* and set some type-dependent values */
975 sdata->vif.type = type;
976 sdata->vif.p2p = false;
977 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
978 sdata->wdev.iftype = type;
980 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
981 sdata->control_port_no_encrypt = false;
983 sdata->noack_map = 0;
985 /* only monitor differs */
986 sdata->dev->type = ARPHRD_ETHER;
988 skb_queue_head_init(&sdata->skb_queue);
989 INIT_WORK(&sdata->work, ieee80211_iface_work);
992 case NL80211_IFTYPE_P2P_GO:
993 type = NL80211_IFTYPE_AP;
994 sdata->vif.type = type;
995 sdata->vif.p2p = true;
997 case NL80211_IFTYPE_AP:
998 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
999 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1001 case NL80211_IFTYPE_P2P_CLIENT:
1002 type = NL80211_IFTYPE_STATION;
1003 sdata->vif.type = type;
1004 sdata->vif.p2p = true;
1006 case NL80211_IFTYPE_STATION:
1007 ieee80211_sta_setup_sdata(sdata);
1009 case NL80211_IFTYPE_ADHOC:
1010 ieee80211_ibss_setup_sdata(sdata);
1012 case NL80211_IFTYPE_MESH_POINT:
1013 if (ieee80211_vif_is_mesh(&sdata->vif))
1014 ieee80211_mesh_init_sdata(sdata);
1016 case NL80211_IFTYPE_MONITOR:
1017 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1018 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1019 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1020 MONITOR_FLAG_OTHER_BSS;
1022 case NL80211_IFTYPE_WDS:
1023 case NL80211_IFTYPE_AP_VLAN:
1025 case NL80211_IFTYPE_UNSPECIFIED:
1026 case NUM_NL80211_IFTYPES:
1031 ieee80211_debugfs_add_netdev(sdata);
1034 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1036 switch (sdata->vif.type) {
1037 case NL80211_IFTYPE_MESH_POINT:
1038 mesh_path_flush_by_iface(sdata);
1046 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1047 enum nl80211_iftype type)
1049 struct ieee80211_local *local = sdata->local;
1051 enum nl80211_iftype internal_type = type;
1056 if (!local->ops->change_interface)
1059 switch (sdata->vif.type) {
1060 case NL80211_IFTYPE_AP:
1061 case NL80211_IFTYPE_STATION:
1062 case NL80211_IFTYPE_ADHOC:
1064 * Could maybe also all others here?
1065 * Just not sure how that interacts
1066 * with the RX/config path e.g. for
1075 case NL80211_IFTYPE_AP:
1076 case NL80211_IFTYPE_STATION:
1077 case NL80211_IFTYPE_ADHOC:
1079 * Could probably support everything
1080 * but WDS here (WDS do_open can fail
1081 * under memory pressure, which this
1082 * code isn't prepared to handle).
1085 case NL80211_IFTYPE_P2P_CLIENT:
1087 internal_type = NL80211_IFTYPE_STATION;
1089 case NL80211_IFTYPE_P2P_GO:
1091 internal_type = NL80211_IFTYPE_AP;
1097 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1101 ieee80211_do_stop(sdata, false);
1103 ieee80211_teardown_sdata(sdata->dev);
1105 ret = drv_change_interface(local, sdata, internal_type, p2p);
1107 type = sdata->vif.type;
1110 * Ignore return value here, there's not much we can do since
1111 * the driver changed the interface type internally already.
1112 * The warnings will hopefully make driver authors fix it :-)
1114 ieee80211_check_queues(sdata);
1116 ieee80211_setup_sdata(sdata, type);
1118 err = ieee80211_do_open(sdata->dev, false);
1119 WARN(err, "type change: do_open returned %d", err);
1124 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1125 enum nl80211_iftype type)
1131 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1134 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1135 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1136 type == NL80211_IFTYPE_ADHOC)
1139 if (ieee80211_sdata_running(sdata)) {
1140 ret = ieee80211_runtime_change_iftype(sdata, type);
1144 /* Purge and reset type-dependent state. */
1145 ieee80211_teardown_sdata(sdata->dev);
1146 ieee80211_setup_sdata(sdata, type);
1149 /* reset some values that shouldn't be kept across type changes */
1150 sdata->vif.bss_conf.basic_rates =
1151 ieee80211_mandatory_rates(sdata->local,
1152 sdata->local->hw.conf.channel->band);
1153 sdata->drop_unencrypted = 0;
1154 if (type == NL80211_IFTYPE_STATION)
1155 sdata->u.mgd.use_4addr = false;
1160 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1161 struct net_device *dev,
1162 enum nl80211_iftype type)
1164 struct ieee80211_sub_if_data *sdata;
1165 u64 mask, start, addr, val, inc;
1167 u8 tmp_addr[ETH_ALEN];
1170 /* default ... something at least */
1171 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1173 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1174 local->hw.wiphy->n_addresses <= 1)
1178 mutex_lock(&local->iflist_mtx);
1181 case NL80211_IFTYPE_MONITOR:
1182 /* doesn't matter */
1184 case NL80211_IFTYPE_WDS:
1185 case NL80211_IFTYPE_AP_VLAN:
1186 /* match up with an AP interface */
1187 list_for_each_entry(sdata, &local->interfaces, list) {
1188 if (sdata->vif.type != NL80211_IFTYPE_AP)
1190 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1193 /* keep default if no AP interface present */
1196 /* assign a new address if possible -- try n_addresses first */
1197 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1200 list_for_each_entry(sdata, &local->interfaces, list) {
1201 if (memcmp(local->hw.wiphy->addresses[i].addr,
1202 sdata->vif.addr, ETH_ALEN) == 0) {
1209 memcpy(dev->perm_addr,
1210 local->hw.wiphy->addresses[i].addr,
1216 /* try mask if available */
1217 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1220 m = local->hw.wiphy->addr_mask;
1221 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1222 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1223 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1225 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1226 /* not a contiguous mask ... not handled now! */
1227 printk(KERN_DEBUG "not contiguous\n");
1231 m = local->hw.wiphy->perm_addr;
1232 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1233 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1234 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1236 inc = 1ULL<<__ffs64(mask);
1237 val = (start & mask);
1238 addr = (start & ~mask) | (val & mask);
1242 tmp_addr[5] = addr >> 0*8;
1243 tmp_addr[4] = addr >> 1*8;
1244 tmp_addr[3] = addr >> 2*8;
1245 tmp_addr[2] = addr >> 3*8;
1246 tmp_addr[1] = addr >> 4*8;
1247 tmp_addr[0] = addr >> 5*8;
1251 list_for_each_entry(sdata, &local->interfaces, list) {
1252 if (memcmp(tmp_addr, sdata->vif.addr,
1260 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1263 addr = (start & ~mask) | (val & mask);
1264 } while (addr != start);
1269 mutex_unlock(&local->iflist_mtx);
1272 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1273 struct net_device **new_dev, enum nl80211_iftype type,
1274 struct vif_params *params)
1276 struct net_device *ndev;
1277 struct ieee80211_sub_if_data *sdata = NULL;
1283 if (local->hw.queues >= IEEE80211_NUM_ACS)
1284 txqs = IEEE80211_NUM_ACS;
1286 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1287 name, ieee80211_if_setup, txqs, 1);
1290 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1292 ndev->needed_headroom = local->tx_headroom +
1293 4*6 /* four MAC addresses */
1294 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1296 + 8 /* rfc1042/bridge tunnel */
1297 - ETH_HLEN /* ethernet hard_header_len */
1298 + IEEE80211_ENCRYPT_HEADROOM;
1299 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1301 ret = dev_alloc_name(ndev, ndev->name);
1305 ieee80211_assign_perm_addr(local, ndev, type);
1306 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1307 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1309 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1310 sdata = netdev_priv(ndev);
1311 ndev->ieee80211_ptr = &sdata->wdev;
1312 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1313 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1315 /* initialise type-independent data */
1316 sdata->wdev.wiphy = local->hw.wiphy;
1317 sdata->local = local;
1320 sdata->arp_filter_state = true;
1323 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1324 skb_queue_head_init(&sdata->fragments[i].skb_list);
1326 INIT_LIST_HEAD(&sdata->key_list);
1328 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1329 struct ieee80211_supported_band *sband;
1330 sband = local->hw.wiphy->bands[i];
1331 sdata->rc_rateidx_mask[i] =
1332 sband ? (1 << sband->n_bitrates) - 1 : 0;
1334 memcpy(sdata->rc_rateidx_mcs_mask[i],
1335 sband->ht_cap.mcs.rx_mask,
1336 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1338 memset(sdata->rc_rateidx_mcs_mask[i], 0,
1339 sizeof(sdata->rc_rateidx_mcs_mask[i]));
1342 ieee80211_set_default_queues(sdata);
1344 /* setup type-dependent data */
1345 ieee80211_setup_sdata(sdata, type);
1348 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1349 if (type == NL80211_IFTYPE_STATION)
1350 sdata->u.mgd.use_4addr = params->use_4addr;
1353 ret = register_netdevice(ndev);
1357 mutex_lock(&local->iflist_mtx);
1358 list_add_tail_rcu(&sdata->list, &local->interfaces);
1359 mutex_unlock(&local->iflist_mtx);
1371 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1375 mutex_lock(&sdata->local->iflist_mtx);
1376 list_del_rcu(&sdata->list);
1377 mutex_unlock(&sdata->local->iflist_mtx);
1379 /* clean up type-dependent data */
1380 ieee80211_clean_sdata(sdata);
1383 unregister_netdevice(sdata->dev);
1387 * Remove all interfaces, may only be called at hardware unregistration
1388 * time because it doesn't do RCU-safe list removals.
1390 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1392 struct ieee80211_sub_if_data *sdata, *tmp;
1393 LIST_HEAD(unreg_list);
1397 mutex_lock(&local->iflist_mtx);
1398 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1399 list_del(&sdata->list);
1401 ieee80211_clean_sdata(sdata);
1403 unregister_netdevice_queue(sdata->dev, &unreg_list);
1405 mutex_unlock(&local->iflist_mtx);
1406 unregister_netdevice_many(&unreg_list);
1407 list_del(&unreg_list);
1410 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1413 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1416 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1417 wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1420 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1421 return IEEE80211_CONF_CHANGE_IDLE;
1424 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1426 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1429 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1430 wiphy_debug(local->hw.wiphy, "device now idle\n");
1433 drv_flush(local, false);
1435 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1436 return IEEE80211_CONF_CHANGE_IDLE;
1439 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1441 struct ieee80211_sub_if_data *sdata;
1443 bool working = false, scanning = false, hw_roc = false;
1444 struct ieee80211_work *wk;
1445 unsigned int led_trig_start = 0, led_trig_stop = 0;
1447 #ifdef CONFIG_PROVE_LOCKING
1448 WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1449 !lockdep_is_held(&local->iflist_mtx));
1451 lockdep_assert_held(&local->mtx);
1453 list_for_each_entry(sdata, &local->interfaces, list) {
1454 if (!ieee80211_sdata_running(sdata)) {
1455 sdata->vif.bss_conf.idle = true;
1459 sdata->old_idle = sdata->vif.bss_conf.idle;
1461 /* do not count disabled managed interfaces */
1462 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1463 !sdata->u.mgd.associated &&
1464 !sdata->u.mgd.auth_data &&
1465 !sdata->u.mgd.assoc_data) {
1466 sdata->vif.bss_conf.idle = true;
1469 /* do not count unused IBSS interfaces */
1470 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1471 !sdata->u.ibss.ssid_len) {
1472 sdata->vif.bss_conf.idle = true;
1475 /* count everything else */
1476 sdata->vif.bss_conf.idle = false;
1480 list_for_each_entry(wk, &local->work_list, list) {
1482 wk->sdata->vif.bss_conf.idle = false;
1485 if (local->scan_sdata &&
1486 !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1488 local->scan_sdata->vif.bss_conf.idle = false;
1491 if (local->hw_roc_channel)
1494 list_for_each_entry(sdata, &local->interfaces, list) {
1495 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1496 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1498 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1500 if (!ieee80211_sdata_running(sdata))
1502 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1505 if (working || scanning || hw_roc)
1506 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1508 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1511 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1513 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1515 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1518 return ieee80211_idle_off(local, "hw remain-on-channel");
1520 return ieee80211_idle_off(local, "working");
1522 return ieee80211_idle_off(local, "scanning");
1524 return ieee80211_idle_on(local);
1526 return ieee80211_idle_off(local, "in use");
1531 void ieee80211_recalc_idle(struct ieee80211_local *local)
1535 mutex_lock(&local->iflist_mtx);
1536 chg = __ieee80211_recalc_idle(local);
1537 mutex_unlock(&local->iflist_mtx);
1539 ieee80211_hw_config(local, chg);
1542 static int netdev_notify(struct notifier_block *nb,
1543 unsigned long state,
1546 struct net_device *dev = ndev;
1547 struct ieee80211_sub_if_data *sdata;
1549 if (state != NETDEV_CHANGENAME)
1552 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1555 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1558 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1560 memcpy(sdata->name, dev->name, IFNAMSIZ);
1562 ieee80211_debugfs_rename_netdev(sdata);
1566 static struct notifier_block mac80211_netdev_notifier = {
1567 .notifier_call = netdev_notify,
1570 int ieee80211_iface_init(void)
1572 return register_netdevice_notifier(&mac80211_netdev_notifier);
1575 void ieee80211_iface_exit(void)
1577 unregister_netdevice_notifier(&mac80211_netdev_notifier);