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 (compare_ether_addr(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 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
155 struct ieee80211_local *local = sdata->local;
156 u32 flags = sdata->u.mntr_flags;
158 #define ADJUST(_f, _s) do { \
159 if (flags & MONITOR_FLAG_##_f) \
160 local->fif_##_s += offset; \
163 ADJUST(FCSFAIL, fcsfail);
164 ADJUST(PLCPFAIL, plcpfail);
165 ADJUST(CONTROL, control);
166 ADJUST(CONTROL, pspoll);
167 ADJUST(OTHER_BSS, other_bss);
173 * NOTE: Be very careful when changing this function, it must NOT return
174 * an error on interface type changes that have been pre-checked, so most
175 * checks should be in ieee80211_check_concurrent_iface.
177 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
179 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
180 struct ieee80211_local *local = sdata->local;
181 struct sta_info *sta;
184 u32 hw_reconf_flags = 0;
186 switch (sdata->vif.type) {
187 case NL80211_IFTYPE_WDS:
188 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
191 case NL80211_IFTYPE_AP_VLAN: {
192 struct ieee80211_sub_if_data *master;
197 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
199 master = container_of(sdata->bss,
200 struct ieee80211_sub_if_data, u.ap);
201 sdata->control_port_protocol =
202 master->control_port_protocol;
203 sdata->control_port_no_encrypt =
204 master->control_port_no_encrypt;
207 case NL80211_IFTYPE_AP:
208 sdata->bss = &sdata->u.ap;
210 case NL80211_IFTYPE_MESH_POINT:
211 case NL80211_IFTYPE_STATION:
212 case NL80211_IFTYPE_MONITOR:
213 case NL80211_IFTYPE_ADHOC:
214 /* no special treatment */
216 case NL80211_IFTYPE_UNSPECIFIED:
217 case NUM_NL80211_IFTYPES:
218 case NL80211_IFTYPE_P2P_CLIENT:
219 case NL80211_IFTYPE_P2P_GO:
225 if (local->open_count == 0) {
226 res = drv_start(local);
229 if (local->ops->napi_poll)
230 napi_enable(&local->napi);
231 /* we're brought up, everything changes */
232 hw_reconf_flags = ~0;
233 ieee80211_led_radio(local, true);
234 ieee80211_mod_tpt_led_trig(local,
235 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
239 * Copy the hopefully now-present MAC address to
240 * this interface, if it has the special null one.
242 if (is_zero_ether_addr(dev->dev_addr)) {
243 memcpy(dev->dev_addr,
244 local->hw.wiphy->perm_addr,
246 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
248 if (!is_valid_ether_addr(dev->dev_addr)) {
249 if (!local->open_count)
251 return -EADDRNOTAVAIL;
255 switch (sdata->vif.type) {
256 case NL80211_IFTYPE_AP_VLAN:
257 /* no need to tell driver */
259 case NL80211_IFTYPE_MONITOR:
260 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
261 local->cooked_mntrs++;
265 /* must be before the call to ieee80211_configure_filter */
267 if (local->monitors == 1) {
268 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
269 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
272 ieee80211_adjust_monitor_flags(sdata, 1);
273 ieee80211_configure_filter(local);
275 netif_carrier_on(dev);
279 res = drv_add_interface(local, sdata);
284 if (sdata->vif.type == NL80211_IFTYPE_AP) {
286 local->fif_probe_req++;
288 ieee80211_configure_filter(local);
289 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
290 local->fif_probe_req++;
293 changed |= ieee80211_reset_erp_info(sdata);
294 ieee80211_bss_info_change_notify(sdata, changed);
296 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
297 sdata->vif.type == NL80211_IFTYPE_ADHOC)
298 netif_carrier_off(dev);
300 netif_carrier_on(dev);
303 * set default queue parameters so drivers don't
304 * need to initialise the hardware if the hardware
305 * doesn't start up with sane defaults
307 ieee80211_set_wmm_default(sdata);
310 set_bit(SDATA_STATE_RUNNING, &sdata->state);
312 if (sdata->vif.type == NL80211_IFTYPE_WDS) {
313 /* Create STA entry for the WDS peer */
314 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
318 goto err_del_interface;
321 sta_info_move_state(sta, IEEE80211_STA_AUTH);
322 sta_info_move_state(sta, IEEE80211_STA_ASSOC);
323 sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
325 res = sta_info_insert(sta);
327 /* STA has been freed */
328 goto err_del_interface;
331 rate_control_rate_init(sta);
335 * set_multicast_list will be invoked by the networking core
336 * which will check whether any increments here were done in
337 * error and sync them down to the hardware as filter flags.
339 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
340 atomic_inc(&local->iff_allmultis);
342 if (sdata->flags & IEEE80211_SDATA_PROMISC)
343 atomic_inc(&local->iff_promiscs);
345 mutex_lock(&local->mtx);
346 hw_reconf_flags |= __ieee80211_recalc_idle(local);
347 mutex_unlock(&local->mtx);
353 ieee80211_hw_config(local, hw_reconf_flags);
355 ieee80211_recalc_ps(local, -1);
357 netif_tx_start_all_queues(dev);
361 drv_remove_interface(local, sdata);
363 if (!local->open_count)
367 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
368 list_del(&sdata->u.vlan.list);
369 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
373 static int ieee80211_open(struct net_device *dev)
375 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
378 /* fail early if user set an invalid address */
379 if (!is_valid_ether_addr(dev->dev_addr))
380 return -EADDRNOTAVAIL;
382 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
386 return ieee80211_do_open(dev, true);
389 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
392 struct ieee80211_local *local = sdata->local;
394 struct sk_buff *skb, *tmp;
395 u32 hw_reconf_flags = 0;
397 enum nl80211_channel_type orig_ct;
399 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
401 if (local->scan_sdata == sdata)
402 ieee80211_scan_cancel(local);
405 * Stop TX on this interface first.
407 netif_tx_stop_all_queues(sdata->dev);
410 * Purge work for this interface.
412 ieee80211_work_purge(sdata);
415 * Remove all stations associated with this interface.
417 * This must be done before calling ops->remove_interface()
418 * because otherwise we can later invoke ops->sta_notify()
419 * whenever the STAs are removed, and that invalidates driver
420 * assumptions about always getting a vif pointer that is valid
421 * (because if we remove a STA after ops->remove_interface()
422 * the driver will have removed the vif info already!)
424 * This is relevant only in AP, WDS and mesh modes, since in
425 * all other modes we've already removed all stations when
428 sta_info_flush(local, sdata);
431 * Don't count this interface for promisc/allmulti while it
432 * is down. dev_mc_unsync() will invoke set_multicast_list
433 * on the master interface which will sync these down to the
434 * hardware as filter flags.
436 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
437 atomic_dec(&local->iff_allmultis);
439 if (sdata->flags & IEEE80211_SDATA_PROMISC)
440 atomic_dec(&local->iff_promiscs);
442 if (sdata->vif.type == NL80211_IFTYPE_AP) {
444 local->fif_probe_req--;
445 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
446 local->fif_probe_req--;
449 netif_addr_lock_bh(sdata->dev);
450 spin_lock_bh(&local->filter_lock);
451 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
452 sdata->dev->addr_len);
453 spin_unlock_bh(&local->filter_lock);
454 netif_addr_unlock_bh(sdata->dev);
456 ieee80211_configure_filter(local);
458 del_timer_sync(&local->dynamic_ps_timer);
459 cancel_work_sync(&local->dynamic_ps_enable_work);
461 /* APs need special treatment */
462 if (sdata->vif.type == NL80211_IFTYPE_AP) {
463 struct ieee80211_sub_if_data *vlan, *tmpsdata;
464 struct beacon_data *old_beacon =
465 rtnl_dereference(sdata->u.ap.beacon);
466 struct sk_buff *old_probe_resp =
467 rtnl_dereference(sdata->u.ap.probe_resp);
469 /* sdata_running will return false, so this will disable */
470 ieee80211_bss_info_change_notify(sdata,
471 BSS_CHANGED_BEACON_ENABLED);
473 /* remove beacon and probe response */
474 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
475 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
478 kfree_skb(old_probe_resp);
480 /* down all dependent devices, that is VLANs */
481 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
483 dev_close(vlan->dev);
484 WARN_ON(!list_empty(&sdata->u.ap.vlans));
486 /* free all potentially still buffered bcast frames */
487 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
488 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
494 switch (sdata->vif.type) {
495 case NL80211_IFTYPE_AP_VLAN:
496 list_del(&sdata->u.vlan.list);
497 /* no need to tell driver */
499 case NL80211_IFTYPE_MONITOR:
500 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
501 local->cooked_mntrs--;
506 if (local->monitors == 0) {
507 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
508 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
511 ieee80211_adjust_monitor_flags(sdata, -1);
512 ieee80211_configure_filter(local);
515 flush_work(&sdata->work);
517 * When we get here, the interface is marked down.
518 * Call synchronize_rcu() to wait for the RX path
519 * should it be using the interface and enqueuing
520 * frames at this very time on another CPU.
523 skb_queue_purge(&sdata->skb_queue);
526 * Disable beaconing here for mesh only, AP and IBSS
527 * are already taken care of.
529 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
530 ieee80211_bss_info_change_notify(sdata,
531 BSS_CHANGED_BEACON_ENABLED);
534 * Free all remaining keys, there shouldn't be any,
535 * except maybe group keys in AP more or WDS?
537 ieee80211_free_keys(sdata);
540 drv_remove_interface(local, sdata);
545 mutex_lock(&local->mtx);
546 hw_reconf_flags |= __ieee80211_recalc_idle(local);
547 mutex_unlock(&local->mtx);
549 ieee80211_recalc_ps(local, -1);
551 if (local->open_count == 0) {
552 if (local->ops->napi_poll)
553 napi_disable(&local->napi);
554 ieee80211_clear_tx_pending(local);
555 ieee80211_stop_device(local);
557 /* no reconfiguring after stop! */
561 /* Re-calculate channel-type, in case there are multiple vifs
562 * on different channel types.
564 orig_ct = local->_oper_channel_type;
565 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
567 /* do after stop to avoid reconfiguring when we stop anyway */
568 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
569 ieee80211_hw_config(local, hw_reconf_flags);
571 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
572 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
573 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
574 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
575 if (info->control.vif == &sdata->vif) {
576 __skb_unlink(skb, &local->pending[i]);
577 dev_kfree_skb_irq(skb);
581 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
584 static int ieee80211_stop(struct net_device *dev)
586 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
588 ieee80211_do_stop(sdata, true);
593 static void ieee80211_set_multicast_list(struct net_device *dev)
595 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
596 struct ieee80211_local *local = sdata->local;
597 int allmulti, promisc, sdata_allmulti, sdata_promisc;
599 allmulti = !!(dev->flags & IFF_ALLMULTI);
600 promisc = !!(dev->flags & IFF_PROMISC);
601 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
602 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
604 if (allmulti != sdata_allmulti) {
605 if (dev->flags & IFF_ALLMULTI)
606 atomic_inc(&local->iff_allmultis);
608 atomic_dec(&local->iff_allmultis);
609 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
612 if (promisc != sdata_promisc) {
613 if (dev->flags & IFF_PROMISC)
614 atomic_inc(&local->iff_promiscs);
616 atomic_dec(&local->iff_promiscs);
617 sdata->flags ^= IEEE80211_SDATA_PROMISC;
619 spin_lock_bh(&local->filter_lock);
620 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
621 spin_unlock_bh(&local->filter_lock);
622 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
626 * Called when the netdev is removed or, by the code below, before
627 * the interface type changes.
629 static void ieee80211_teardown_sdata(struct net_device *dev)
631 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
632 struct ieee80211_local *local = sdata->local;
636 /* free extra data */
637 ieee80211_free_keys(sdata);
639 ieee80211_debugfs_remove_netdev(sdata);
641 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
642 __skb_queue_purge(&sdata->fragments[i].skb_list);
643 sdata->fragment_next = 0;
645 if (ieee80211_vif_is_mesh(&sdata->vif))
646 mesh_rmc_free(sdata);
648 flushed = sta_info_flush(local, sdata);
652 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
655 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
658 static const struct net_device_ops ieee80211_dataif_ops = {
659 .ndo_open = ieee80211_open,
660 .ndo_stop = ieee80211_stop,
661 .ndo_uninit = ieee80211_teardown_sdata,
662 .ndo_start_xmit = ieee80211_subif_start_xmit,
663 .ndo_set_rx_mode = ieee80211_set_multicast_list,
664 .ndo_change_mtu = ieee80211_change_mtu,
665 .ndo_set_mac_address = ieee80211_change_mac,
666 .ndo_select_queue = ieee80211_netdev_select_queue,
669 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
672 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
673 struct ieee80211_local *local = sdata->local;
674 struct ieee80211_hdr *hdr;
675 struct ieee80211_radiotap_header *rtap = (void *)skb->data;
677 if (local->hw.queues < 4)
681 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
682 return 0; /* doesn't matter, frame will be dropped */
684 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
686 return ieee80211_select_queue_80211(local, skb, hdr);
689 static const struct net_device_ops ieee80211_monitorif_ops = {
690 .ndo_open = ieee80211_open,
691 .ndo_stop = ieee80211_stop,
692 .ndo_uninit = ieee80211_teardown_sdata,
693 .ndo_start_xmit = ieee80211_monitor_start_xmit,
694 .ndo_set_rx_mode = ieee80211_set_multicast_list,
695 .ndo_change_mtu = ieee80211_change_mtu,
696 .ndo_set_mac_address = eth_mac_addr,
697 .ndo_select_queue = ieee80211_monitor_select_queue,
700 static void ieee80211_if_setup(struct net_device *dev)
703 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
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,
799 mutex_unlock(&local->sta_mtx);
800 } else switch (sdata->vif.type) {
801 case NL80211_IFTYPE_STATION:
802 ieee80211_sta_rx_queued_mgmt(sdata, skb);
804 case NL80211_IFTYPE_ADHOC:
805 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
807 case NL80211_IFTYPE_MESH_POINT:
808 if (!ieee80211_vif_is_mesh(&sdata->vif))
810 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
813 WARN(1, "frame for unexpected interface type");
820 /* then other type-dependent work */
821 switch (sdata->vif.type) {
822 case NL80211_IFTYPE_STATION:
823 ieee80211_sta_work(sdata);
825 case NL80211_IFTYPE_ADHOC:
826 ieee80211_ibss_work(sdata);
828 case NL80211_IFTYPE_MESH_POINT:
829 if (!ieee80211_vif_is_mesh(&sdata->vif))
831 ieee80211_mesh_work(sdata);
840 * Helper function to initialise an interface to a specific type.
842 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
843 enum nl80211_iftype type)
845 /* clear type-dependent union */
846 memset(&sdata->u, 0, sizeof(sdata->u));
848 /* and set some type-dependent values */
849 sdata->vif.type = type;
850 sdata->vif.p2p = false;
851 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
852 sdata->wdev.iftype = type;
854 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
855 sdata->control_port_no_encrypt = false;
857 sdata->noack_map = 0;
859 /* only monitor differs */
860 sdata->dev->type = ARPHRD_ETHER;
862 skb_queue_head_init(&sdata->skb_queue);
863 INIT_WORK(&sdata->work, ieee80211_iface_work);
866 case NL80211_IFTYPE_P2P_GO:
867 type = NL80211_IFTYPE_AP;
868 sdata->vif.type = type;
869 sdata->vif.p2p = true;
871 case NL80211_IFTYPE_AP:
872 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
873 INIT_LIST_HEAD(&sdata->u.ap.vlans);
875 case NL80211_IFTYPE_P2P_CLIENT:
876 type = NL80211_IFTYPE_STATION;
877 sdata->vif.type = type;
878 sdata->vif.p2p = true;
880 case NL80211_IFTYPE_STATION:
881 ieee80211_sta_setup_sdata(sdata);
883 case NL80211_IFTYPE_ADHOC:
884 ieee80211_ibss_setup_sdata(sdata);
886 case NL80211_IFTYPE_MESH_POINT:
887 if (ieee80211_vif_is_mesh(&sdata->vif))
888 ieee80211_mesh_init_sdata(sdata);
890 case NL80211_IFTYPE_MONITOR:
891 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
892 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
893 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
894 MONITOR_FLAG_OTHER_BSS;
896 case NL80211_IFTYPE_WDS:
897 case NL80211_IFTYPE_AP_VLAN:
899 case NL80211_IFTYPE_UNSPECIFIED:
900 case NUM_NL80211_IFTYPES:
905 ieee80211_debugfs_add_netdev(sdata);
908 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
909 enum nl80211_iftype type)
911 struct ieee80211_local *local = sdata->local;
913 enum nl80211_iftype internal_type = type;
918 if (!local->ops->change_interface)
921 switch (sdata->vif.type) {
922 case NL80211_IFTYPE_AP:
923 case NL80211_IFTYPE_STATION:
924 case NL80211_IFTYPE_ADHOC:
926 * Could maybe also all others here?
927 * Just not sure how that interacts
928 * with the RX/config path e.g. for
937 case NL80211_IFTYPE_AP:
938 case NL80211_IFTYPE_STATION:
939 case NL80211_IFTYPE_ADHOC:
941 * Could probably support everything
942 * but WDS here (WDS do_open can fail
943 * under memory pressure, which this
944 * code isn't prepared to handle).
947 case NL80211_IFTYPE_P2P_CLIENT:
949 internal_type = NL80211_IFTYPE_STATION;
951 case NL80211_IFTYPE_P2P_GO:
953 internal_type = NL80211_IFTYPE_AP;
959 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
963 ieee80211_do_stop(sdata, false);
965 ieee80211_teardown_sdata(sdata->dev);
967 ret = drv_change_interface(local, sdata, internal_type, p2p);
969 type = sdata->vif.type;
971 ieee80211_setup_sdata(sdata, type);
973 err = ieee80211_do_open(sdata->dev, false);
974 WARN(err, "type change: do_open returned %d", err);
979 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
980 enum nl80211_iftype type)
986 if (type == ieee80211_vif_type_p2p(&sdata->vif))
989 /* Setting ad-hoc mode on non-IBSS channel is not supported. */
990 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
991 type == NL80211_IFTYPE_ADHOC)
994 if (ieee80211_sdata_running(sdata)) {
995 ret = ieee80211_runtime_change_iftype(sdata, type);
999 /* Purge and reset type-dependent state. */
1000 ieee80211_teardown_sdata(sdata->dev);
1001 ieee80211_setup_sdata(sdata, type);
1004 /* reset some values that shouldn't be kept across type changes */
1005 sdata->vif.bss_conf.basic_rates =
1006 ieee80211_mandatory_rates(sdata->local,
1007 sdata->local->hw.conf.channel->band);
1008 sdata->drop_unencrypted = 0;
1009 if (type == NL80211_IFTYPE_STATION)
1010 sdata->u.mgd.use_4addr = false;
1015 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1016 struct net_device *dev,
1017 enum nl80211_iftype type)
1019 struct ieee80211_sub_if_data *sdata;
1020 u64 mask, start, addr, val, inc;
1022 u8 tmp_addr[ETH_ALEN];
1025 /* default ... something at least */
1026 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1028 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1029 local->hw.wiphy->n_addresses <= 1)
1033 mutex_lock(&local->iflist_mtx);
1036 case NL80211_IFTYPE_MONITOR:
1037 /* doesn't matter */
1039 case NL80211_IFTYPE_WDS:
1040 case NL80211_IFTYPE_AP_VLAN:
1041 /* match up with an AP interface */
1042 list_for_each_entry(sdata, &local->interfaces, list) {
1043 if (sdata->vif.type != NL80211_IFTYPE_AP)
1045 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1048 /* keep default if no AP interface present */
1051 /* assign a new address if possible -- try n_addresses first */
1052 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1055 list_for_each_entry(sdata, &local->interfaces, list) {
1056 if (memcmp(local->hw.wiphy->addresses[i].addr,
1057 sdata->vif.addr, ETH_ALEN) == 0) {
1064 memcpy(dev->perm_addr,
1065 local->hw.wiphy->addresses[i].addr,
1071 /* try mask if available */
1072 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1075 m = local->hw.wiphy->addr_mask;
1076 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1077 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1078 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1080 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1081 /* not a contiguous mask ... not handled now! */
1082 printk(KERN_DEBUG "not contiguous\n");
1086 m = local->hw.wiphy->perm_addr;
1087 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1088 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1089 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1091 inc = 1ULL<<__ffs64(mask);
1092 val = (start & mask);
1093 addr = (start & ~mask) | (val & mask);
1097 tmp_addr[5] = addr >> 0*8;
1098 tmp_addr[4] = addr >> 1*8;
1099 tmp_addr[3] = addr >> 2*8;
1100 tmp_addr[2] = addr >> 3*8;
1101 tmp_addr[1] = addr >> 4*8;
1102 tmp_addr[0] = addr >> 5*8;
1106 list_for_each_entry(sdata, &local->interfaces, list) {
1107 if (memcmp(tmp_addr, sdata->vif.addr,
1115 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1118 addr = (start & ~mask) | (val & mask);
1119 } while (addr != start);
1124 mutex_unlock(&local->iflist_mtx);
1127 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1128 struct net_device **new_dev, enum nl80211_iftype type,
1129 struct vif_params *params)
1131 struct net_device *ndev;
1132 struct ieee80211_sub_if_data *sdata = NULL;
1137 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1138 name, ieee80211_if_setup, local->hw.queues, 1);
1141 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1143 ndev->needed_headroom = local->tx_headroom +
1144 4*6 /* four MAC addresses */
1145 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1147 + 8 /* rfc1042/bridge tunnel */
1148 - ETH_HLEN /* ethernet hard_header_len */
1149 + IEEE80211_ENCRYPT_HEADROOM;
1150 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1152 ret = dev_alloc_name(ndev, ndev->name);
1156 ieee80211_assign_perm_addr(local, ndev, type);
1157 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1158 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1160 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1161 sdata = netdev_priv(ndev);
1162 ndev->ieee80211_ptr = &sdata->wdev;
1163 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1164 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1166 /* initialise type-independent data */
1167 sdata->wdev.wiphy = local->hw.wiphy;
1168 sdata->local = local;
1171 sdata->arp_filter_state = true;
1174 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1175 skb_queue_head_init(&sdata->fragments[i].skb_list);
1177 INIT_LIST_HEAD(&sdata->key_list);
1179 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1180 struct ieee80211_supported_band *sband;
1181 sband = local->hw.wiphy->bands[i];
1182 sdata->rc_rateidx_mask[i] =
1183 sband ? (1 << sband->n_bitrates) - 1 : 0;
1186 /* setup type-dependent data */
1187 ieee80211_setup_sdata(sdata, type);
1190 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1191 if (type == NL80211_IFTYPE_STATION)
1192 sdata->u.mgd.use_4addr = params->use_4addr;
1195 ret = register_netdevice(ndev);
1199 mutex_lock(&local->iflist_mtx);
1200 list_add_tail_rcu(&sdata->list, &local->interfaces);
1201 mutex_unlock(&local->iflist_mtx);
1213 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1217 mutex_lock(&sdata->local->iflist_mtx);
1218 list_del_rcu(&sdata->list);
1219 mutex_unlock(&sdata->local->iflist_mtx);
1221 if (ieee80211_vif_is_mesh(&sdata->vif))
1222 mesh_path_flush_by_iface(sdata);
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 if (ieee80211_vif_is_mesh(&sdata->vif))
1244 mesh_path_flush_by_iface(sdata);
1246 unregister_netdevice_queue(sdata->dev, &unreg_list);
1248 mutex_unlock(&local->iflist_mtx);
1249 unregister_netdevice_many(&unreg_list);
1250 list_del(&unreg_list);
1253 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1256 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1259 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1260 wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1263 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1264 return IEEE80211_CONF_CHANGE_IDLE;
1267 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1269 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1272 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1273 wiphy_debug(local->hw.wiphy, "device now idle\n");
1276 drv_flush(local, false);
1278 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1279 return IEEE80211_CONF_CHANGE_IDLE;
1282 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1284 struct ieee80211_sub_if_data *sdata;
1286 bool working = false, scanning = false, hw_roc = false;
1287 struct ieee80211_work *wk;
1288 unsigned int led_trig_start = 0, led_trig_stop = 0;
1290 #ifdef CONFIG_PROVE_LOCKING
1291 WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1292 !lockdep_is_held(&local->iflist_mtx));
1294 lockdep_assert_held(&local->mtx);
1296 list_for_each_entry(sdata, &local->interfaces, list) {
1297 if (!ieee80211_sdata_running(sdata)) {
1298 sdata->vif.bss_conf.idle = true;
1302 sdata->old_idle = sdata->vif.bss_conf.idle;
1304 /* do not count disabled managed interfaces */
1305 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1306 !sdata->u.mgd.associated) {
1307 sdata->vif.bss_conf.idle = true;
1310 /* do not count unused IBSS interfaces */
1311 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1312 !sdata->u.ibss.ssid_len) {
1313 sdata->vif.bss_conf.idle = true;
1316 /* count everything else */
1320 list_for_each_entry(wk, &local->work_list, list) {
1322 wk->sdata->vif.bss_conf.idle = false;
1325 if (local->scan_sdata) {
1327 local->scan_sdata->vif.bss_conf.idle = false;
1330 if (local->hw_roc_channel)
1333 list_for_each_entry(sdata, &local->interfaces, list) {
1334 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1336 if (!ieee80211_sdata_running(sdata))
1338 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1341 if (working || scanning || hw_roc)
1342 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1344 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1347 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1349 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1351 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1354 return ieee80211_idle_off(local, "hw remain-on-channel");
1356 return ieee80211_idle_off(local, "working");
1358 return ieee80211_idle_off(local, "scanning");
1360 return ieee80211_idle_on(local);
1362 return ieee80211_idle_off(local, "in use");
1367 void ieee80211_recalc_idle(struct ieee80211_local *local)
1371 mutex_lock(&local->iflist_mtx);
1372 chg = __ieee80211_recalc_idle(local);
1373 mutex_unlock(&local->iflist_mtx);
1375 ieee80211_hw_config(local, chg);
1378 static int netdev_notify(struct notifier_block *nb,
1379 unsigned long state,
1382 struct net_device *dev = ndev;
1383 struct ieee80211_sub_if_data *sdata;
1385 if (state != NETDEV_CHANGENAME)
1388 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1391 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1394 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1396 memcpy(sdata->name, dev->name, IFNAMSIZ);
1398 ieee80211_debugfs_rename_netdev(sdata);
1402 static struct notifier_block mac80211_netdev_notifier = {
1403 .notifier_call = netdev_notify,
1406 int ieee80211_iface_init(void)
1408 return register_netdevice_notifier(&mac80211_netdev_notifier);
1411 void ieee80211_iface_exit(void)
1413 unregister_netdevice_notifier(&mac80211_netdev_notifier);