2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <net/mac80211.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/if_arp.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/bitmap.h>
22 #include <linux/pm_qos_params.h>
23 #include <net/net_namespace.h>
24 #include <net/cfg80211.h>
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
36 bool ieee80211_disable_40mhz_24ghz;
37 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
38 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
39 "Disable 40MHz support in the 2.4GHz band");
41 void ieee80211_configure_filter(struct ieee80211_local *local)
44 unsigned int changed_flags;
45 unsigned int new_flags = 0;
47 if (atomic_read(&local->iff_promiscs))
48 new_flags |= FIF_PROMISC_IN_BSS;
50 if (atomic_read(&local->iff_allmultis))
51 new_flags |= FIF_ALLMULTI;
53 if (local->monitors || local->scanning)
54 new_flags |= FIF_BCN_PRBRESP_PROMISC;
56 if (local->fif_fcsfail)
57 new_flags |= FIF_FCSFAIL;
59 if (local->fif_plcpfail)
60 new_flags |= FIF_PLCPFAIL;
62 if (local->fif_control)
63 new_flags |= FIF_CONTROL;
65 if (local->fif_other_bss)
66 new_flags |= FIF_OTHER_BSS;
68 if (local->fif_pspoll)
69 new_flags |= FIF_PSPOLL;
71 spin_lock_bh(&local->filter_lock);
72 changed_flags = local->filter_flags ^ new_flags;
74 mc = drv_prepare_multicast(local, &local->mc_list);
75 spin_unlock_bh(&local->filter_lock);
80 drv_configure_filter(local, changed_flags, &new_flags, mc);
82 WARN_ON(new_flags & (1<<31));
84 local->filter_flags = new_flags & ~(1<<31);
87 static void ieee80211_reconfig_filter(struct work_struct *work)
89 struct ieee80211_local *local =
90 container_of(work, struct ieee80211_local, reconfig_filter);
92 ieee80211_configure_filter(local);
95 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
97 struct ieee80211_channel *chan, *scan_chan;
100 enum nl80211_channel_type channel_type;
104 scan_chan = local->scan_channel;
108 channel_type = NL80211_CHAN_NO_HT;
109 } else if (local->tmp_channel) {
110 chan = scan_chan = local->tmp_channel;
111 channel_type = local->tmp_channel_type;
113 chan = local->oper_channel;
114 channel_type = local->_oper_channel_type;
117 if (chan != local->hw.conf.channel ||
118 channel_type != local->hw.conf.channel_type) {
119 local->hw.conf.channel = chan;
120 local->hw.conf.channel_type = channel_type;
121 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
124 if (!conf_is_ht(&local->hw.conf)) {
126 * mac80211.h documents that this is only valid
127 * when the channel is set to an HT type, and
128 * that otherwise STATIC is used.
130 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
131 } else if (local->hw.conf.smps_mode != local->smps_mode) {
132 local->hw.conf.smps_mode = local->smps_mode;
133 changed |= IEEE80211_CONF_CHANGE_SMPS;
137 power = chan->max_power;
139 power = local->power_constr_level ?
140 (chan->max_power - local->power_constr_level) :
143 if (local->user_power_level >= 0)
144 power = min(power, local->user_power_level);
146 if (local->hw.conf.power_level != power) {
147 changed |= IEEE80211_CONF_CHANGE_POWER;
148 local->hw.conf.power_level = power;
151 if (changed && local->open_count) {
152 ret = drv_config(local, changed);
155 * HW reconfiguration should never fail, the driver has told
156 * us what it can support so it should live up to that promise.
159 * rfkill is not integrated with mac80211 and a
160 * configuration command can thus fail if hardware rfkill
163 * FIXME: integrate rfkill with mac80211 and then add this
173 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
176 struct ieee80211_local *local = sdata->local;
177 static const u8 zero[ETH_ALEN] = { 0 };
182 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
184 * While not associated, claim a BSSID of all-zeroes
185 * so that drivers don't do any weird things with the
186 * BSSID at that time.
188 if (sdata->vif.bss_conf.assoc)
189 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
191 sdata->vif.bss_conf.bssid = zero;
192 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
193 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
194 else if (sdata->vif.type == NL80211_IFTYPE_AP)
195 sdata->vif.bss_conf.bssid = sdata->vif.addr;
196 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
197 sdata->vif.bss_conf.bssid = zero;
203 switch (sdata->vif.type) {
204 case NL80211_IFTYPE_AP:
205 case NL80211_IFTYPE_ADHOC:
206 case NL80211_IFTYPE_MESH_POINT:
209 /* do not warn to simplify caller in scan.c */
210 changed &= ~BSS_CHANGED_BEACON_ENABLED;
211 if (WARN_ON(changed & BSS_CHANGED_BEACON))
216 if (changed & BSS_CHANGED_BEACON_ENABLED) {
217 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
218 test_bit(SCAN_SW_SCANNING, &local->scanning)) {
219 sdata->vif.bss_conf.enable_beacon = false;
222 * Beacon should be enabled, but AP mode must
223 * check whether there is a beacon configured.
225 switch (sdata->vif.type) {
226 case NL80211_IFTYPE_AP:
227 sdata->vif.bss_conf.enable_beacon =
228 !!sdata->u.ap.beacon;
230 case NL80211_IFTYPE_ADHOC:
231 sdata->vif.bss_conf.enable_beacon =
232 !!sdata->u.ibss.presp;
234 case NL80211_IFTYPE_MESH_POINT:
235 sdata->vif.bss_conf.enable_beacon = true;
245 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
248 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
250 sdata->vif.bss_conf.use_cts_prot = false;
251 sdata->vif.bss_conf.use_short_preamble = false;
252 sdata->vif.bss_conf.use_short_slot = false;
253 return BSS_CHANGED_ERP_CTS_PROT |
254 BSS_CHANGED_ERP_PREAMBLE |
255 BSS_CHANGED_ERP_SLOT;
258 static void ieee80211_tasklet_handler(unsigned long data)
260 struct ieee80211_local *local = (struct ieee80211_local *) data;
263 while ((skb = skb_dequeue(&local->skb_queue)) ||
264 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
265 switch (skb->pkt_type) {
266 case IEEE80211_RX_MSG:
267 /* Clear skb->pkt_type in order to not confuse kernel
270 ieee80211_rx(local_to_hw(local), skb);
272 case IEEE80211_TX_STATUS_MSG:
274 ieee80211_tx_status(local_to_hw(local), skb);
277 WARN(1, "mac80211: Packet is of unknown type %d\n",
285 static void ieee80211_restart_work(struct work_struct *work)
287 struct ieee80211_local *local =
288 container_of(work, struct ieee80211_local, restart_work);
291 ieee80211_reconfig(local);
295 void ieee80211_restart_hw(struct ieee80211_hw *hw)
297 struct ieee80211_local *local = hw_to_local(hw);
299 trace_api_restart_hw(local);
301 /* use this reason, __ieee80211_resume will unblock it */
302 ieee80211_stop_queues_by_reason(hw,
303 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
305 schedule_work(&local->restart_work);
307 EXPORT_SYMBOL(ieee80211_restart_hw);
309 static void ieee80211_recalc_smps_work(struct work_struct *work)
311 struct ieee80211_local *local =
312 container_of(work, struct ieee80211_local, recalc_smps);
314 mutex_lock(&local->iflist_mtx);
315 ieee80211_recalc_smps(local, NULL);
316 mutex_unlock(&local->iflist_mtx);
320 int ieee80211_set_arp_filter(struct ieee80211_sub_if_data *sdata)
322 struct in_device *idev;
328 idev = sdata->dev->ip_ptr;
332 ret = drv_configure_arp_filter(sdata->local, &sdata->vif,
337 static int ieee80211_ifa_changed(struct notifier_block *nb,
338 unsigned long data, void *arg)
340 struct in_ifaddr *ifa = arg;
341 struct ieee80211_local *local =
342 container_of(nb, struct ieee80211_local,
344 struct net_device *ndev = ifa->ifa_dev->dev;
345 struct wireless_dev *wdev = ndev->ieee80211_ptr;
346 struct ieee80211_sub_if_data *sdata;
347 struct ieee80211_if_managed *ifmgd;
349 if (!netif_running(ndev))
352 /* Make sure it's our interface that got changed */
356 if (wdev->wiphy != local->hw.wiphy)
359 /* We are concerned about IP addresses only when associated */
360 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
362 /* ARP filtering is only supported in managed mode */
363 if (sdata->vif.type != NL80211_IFTYPE_STATION)
366 ifmgd = &sdata->u.mgd;
367 mutex_lock(&ifmgd->mtx);
368 if (ifmgd->associated)
369 ieee80211_set_arp_filter(sdata);
370 mutex_unlock(&ifmgd->mtx);
376 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
377 const struct ieee80211_ops *ops)
379 struct ieee80211_local *local;
383 /* Ensure 32-byte alignment of our private data and hw private data.
384 * We use the wiphy priv data for both our ieee80211_local and for
385 * the driver's private data
387 * In memory it'll be like this:
389 * +-------------------------+
391 * +-------------------------+
392 * | struct ieee80211_local |
393 * +-------------------------+
394 * | driver's private data |
395 * +-------------------------+
398 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
400 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
405 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
406 WIPHY_FLAG_4ADDR_AP |
407 WIPHY_FLAG_4ADDR_STATION;
408 wiphy->privid = mac80211_wiphy_privid;
410 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
412 local = wiphy_priv(wiphy);
414 local->hw.wiphy = wiphy;
416 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
421 BUG_ON(!ops->config);
422 BUG_ON(!ops->add_interface);
423 BUG_ON(!ops->remove_interface);
424 BUG_ON(!ops->configure_filter);
427 /* set up some defaults */
428 local->hw.queues = 1;
429 local->hw.max_rates = 1;
430 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
431 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
432 local->user_power_level = -1;
433 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
434 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
436 INIT_LIST_HEAD(&local->interfaces);
438 __hw_addr_init(&local->mc_list);
440 mutex_init(&local->iflist_mtx);
441 mutex_init(&local->scan_mtx);
443 mutex_init(&local->key_mtx);
444 spin_lock_init(&local->filter_lock);
445 spin_lock_init(&local->queue_stop_reason_lock);
447 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
449 ieee80211_work_init(local);
451 INIT_WORK(&local->restart_work, ieee80211_restart_work);
453 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
454 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
455 local->smps_mode = IEEE80211_SMPS_OFF;
457 INIT_WORK(&local->dynamic_ps_enable_work,
458 ieee80211_dynamic_ps_enable_work);
459 INIT_WORK(&local->dynamic_ps_disable_work,
460 ieee80211_dynamic_ps_disable_work);
461 setup_timer(&local->dynamic_ps_timer,
462 ieee80211_dynamic_ps_timer, (unsigned long) local);
464 sta_info_init(local);
466 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
467 skb_queue_head_init(&local->pending[i]);
468 atomic_set(&local->agg_queue_stop[i], 0);
470 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
471 (unsigned long)local);
473 tasklet_init(&local->tasklet,
474 ieee80211_tasklet_handler,
475 (unsigned long) local);
477 skb_queue_head_init(&local->skb_queue);
478 skb_queue_head_init(&local->skb_queue_unreliable);
480 return local_to_hw(local);
482 EXPORT_SYMBOL(ieee80211_alloc_hw);
484 int ieee80211_register_hw(struct ieee80211_hw *hw)
486 struct ieee80211_local *local = hw_to_local(hw);
488 enum ieee80211_band band;
489 int channels, max_bitrates;
491 static const u32 cipher_suites[] = {
492 WLAN_CIPHER_SUITE_WEP40,
493 WLAN_CIPHER_SUITE_WEP104,
494 WLAN_CIPHER_SUITE_TKIP,
495 WLAN_CIPHER_SUITE_CCMP,
497 /* keep last -- depends on hw flags! */
498 WLAN_CIPHER_SUITE_AES_CMAC
502 * generic code guarantees at least one band,
503 * set this very early because much code assumes
504 * that hw.conf.channel is assigned
509 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
510 struct ieee80211_supported_band *sband;
512 sband = local->hw.wiphy->bands[band];
515 if (!local->oper_channel) {
516 /* init channel we're on */
517 local->hw.conf.channel =
518 local->oper_channel = &sband->channels[0];
519 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
521 channels += sband->n_channels;
523 if (max_bitrates < sband->n_bitrates)
524 max_bitrates = sband->n_bitrates;
525 supp_ht = supp_ht || sband->ht_cap.ht_supported;
528 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
529 sizeof(void *) * channels, GFP_KERNEL);
530 if (!local->int_scan_req)
533 /* if low-level driver supports AP, we also support VLAN */
534 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
535 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
537 /* mac80211 always supports monitor */
538 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
540 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
541 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
542 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
543 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
545 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
546 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
547 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
550 * Calculate scan IE length -- we need this to alloc
551 * memory and to subtract from the driver limit. It
552 * includes the (extended) supported rates and HT
553 * information -- SSID is the driver's responsibility.
555 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
557 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
559 if (!local->ops->hw_scan) {
560 /* For hw_scan, driver needs to set these up. */
561 local->hw.wiphy->max_scan_ssids = 4;
562 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
566 * If the driver supports any scan IEs, then assume the
567 * limit includes the IEs mac80211 will add, otherwise
568 * leave it at zero and let the driver sort it out; we
569 * still pass our IEs to the driver but userspace will
570 * not be allowed to in that case.
572 if (local->hw.wiphy->max_scan_ie_len)
573 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
575 local->hw.wiphy->cipher_suites = cipher_suites;
576 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
577 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
578 local->hw.wiphy->n_cipher_suites--;
580 result = wiphy_register(local->hw.wiphy);
582 goto fail_wiphy_register;
585 * We use the number of queues for feature tests (QoS, HT) internally
586 * so restrict them appropriately.
588 if (hw->queues > IEEE80211_MAX_QUEUES)
589 hw->queues = IEEE80211_MAX_QUEUES;
592 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
593 if (!local->workqueue) {
599 * The hardware needs headroom for sending the frame,
600 * and we need some headroom for passing the frame to monitor
601 * interfaces, but never both at the same time.
603 BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
604 sizeof(struct ieee80211_tx_status_rtap_hdr));
605 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
606 sizeof(struct ieee80211_tx_status_rtap_hdr));
608 debugfs_hw_add(local);
611 * if the driver doesn't specify a max listen interval we
612 * use 5 which should be a safe default
614 if (local->hw.max_listen_interval == 0)
615 local->hw.max_listen_interval = 5;
617 local->hw.conf.listen_interval = local->hw.max_listen_interval;
619 local->hw.conf.dynamic_ps_forced_timeout = -1;
621 result = sta_info_start(local);
625 result = ieee80211_wep_init(local);
627 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
628 wiphy_name(local->hw.wiphy), result);
634 result = ieee80211_init_rate_ctrl_alg(local,
635 hw->rate_control_algorithm);
637 printk(KERN_DEBUG "%s: Failed to initialize rate control "
638 "algorithm\n", wiphy_name(local->hw.wiphy));
642 /* add one default STA interface if supported */
643 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
644 result = ieee80211_if_add(local, "wlan%d", NULL,
645 NL80211_IFTYPE_STATION, NULL);
647 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
648 wiphy_name(local->hw.wiphy));
653 ieee80211_led_init(local);
655 local->network_latency_notifier.notifier_call =
656 ieee80211_max_network_latency;
657 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
658 &local->network_latency_notifier);
665 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
666 result = register_inetaddr_notifier(&local->ifa_notifier);
674 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
675 &local->network_latency_notifier);
678 ieee80211_led_exit(local);
679 ieee80211_remove_interfaces(local);
682 ieee80211_wep_free(local);
684 sta_info_stop(local);
686 destroy_workqueue(local->workqueue);
688 wiphy_unregister(local->hw.wiphy);
690 kfree(local->int_scan_req);
693 EXPORT_SYMBOL(ieee80211_register_hw);
695 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
697 struct ieee80211_local *local = hw_to_local(hw);
699 tasklet_kill(&local->tx_pending_tasklet);
700 tasklet_kill(&local->tasklet);
702 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
703 &local->network_latency_notifier);
705 unregister_inetaddr_notifier(&local->ifa_notifier);
711 * At this point, interface list manipulations are fine
712 * because the driver cannot be handing us frames any
713 * more and the tasklet is killed.
715 ieee80211_remove_interfaces(local);
719 cancel_work_sync(&local->reconfig_filter);
721 ieee80211_clear_tx_pending(local);
722 sta_info_stop(local);
723 rate_control_deinitialize(local);
725 if (skb_queue_len(&local->skb_queue) ||
726 skb_queue_len(&local->skb_queue_unreliable))
727 printk(KERN_WARNING "%s: skb_queue not empty\n",
728 wiphy_name(local->hw.wiphy));
729 skb_queue_purge(&local->skb_queue);
730 skb_queue_purge(&local->skb_queue_unreliable);
732 destroy_workqueue(local->workqueue);
733 wiphy_unregister(local->hw.wiphy);
734 ieee80211_wep_free(local);
735 ieee80211_led_exit(local);
736 kfree(local->int_scan_req);
738 EXPORT_SYMBOL(ieee80211_unregister_hw);
740 void ieee80211_free_hw(struct ieee80211_hw *hw)
742 struct ieee80211_local *local = hw_to_local(hw);
744 mutex_destroy(&local->iflist_mtx);
745 mutex_destroy(&local->scan_mtx);
747 wiphy_free(local->hw.wiphy);
749 EXPORT_SYMBOL(ieee80211_free_hw);
751 static int __init ieee80211_init(void)
756 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
757 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
758 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
760 ret = rc80211_minstrel_init();
764 ret = rc80211_minstrel_ht_init();
768 ret = rc80211_pid_init();
772 ret = ieee80211_iface_init();
780 rc80211_minstrel_ht_exit();
782 rc80211_minstrel_exit();
787 static void __exit ieee80211_exit(void)
790 rc80211_minstrel_ht_exit();
791 rc80211_minstrel_exit();
794 * For key todo, it'll be empty by now but the work
795 * might still be scheduled.
797 flush_scheduled_work();
802 ieee80211_iface_exit();
806 subsys_initcall(ieee80211_init);
807 module_exit(ieee80211_exit);
809 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
810 MODULE_LICENSE("GPL");