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 <linux/inetdevice.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
37 bool ieee80211_disable_40mhz_24ghz;
38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
40 "Disable 40MHz support in the 2.4GHz band");
42 void ieee80211_configure_filter(struct ieee80211_local *local)
45 unsigned int changed_flags;
46 unsigned int new_flags = 0;
48 if (atomic_read(&local->iff_promiscs))
49 new_flags |= FIF_PROMISC_IN_BSS;
51 if (atomic_read(&local->iff_allmultis))
52 new_flags |= FIF_ALLMULTI;
54 if (local->monitors || local->scanning)
55 new_flags |= FIF_BCN_PRBRESP_PROMISC;
57 if (local->fif_fcsfail)
58 new_flags |= FIF_FCSFAIL;
60 if (local->fif_plcpfail)
61 new_flags |= FIF_PLCPFAIL;
63 if (local->fif_control)
64 new_flags |= FIF_CONTROL;
66 if (local->fif_other_bss)
67 new_flags |= FIF_OTHER_BSS;
69 if (local->fif_pspoll)
70 new_flags |= FIF_PSPOLL;
72 spin_lock_bh(&local->filter_lock);
73 changed_flags = local->filter_flags ^ new_flags;
75 mc = drv_prepare_multicast(local, &local->mc_list);
76 spin_unlock_bh(&local->filter_lock);
81 drv_configure_filter(local, changed_flags, &new_flags, mc);
83 WARN_ON(new_flags & (1<<31));
85 local->filter_flags = new_flags & ~(1<<31);
88 static void ieee80211_reconfig_filter(struct work_struct *work)
90 struct ieee80211_local *local =
91 container_of(work, struct ieee80211_local, reconfig_filter);
93 ieee80211_configure_filter(local);
96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
98 struct ieee80211_channel *chan, *scan_chan;
101 enum nl80211_channel_type channel_type;
105 scan_chan = local->scan_channel;
109 channel_type = NL80211_CHAN_NO_HT;
110 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
111 } else if (local->tmp_channel &&
112 local->oper_channel != local->tmp_channel) {
113 chan = scan_chan = local->tmp_channel;
114 channel_type = local->tmp_channel_type;
115 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
117 chan = local->oper_channel;
118 channel_type = local->_oper_channel_type;
119 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
122 if (chan != local->hw.conf.channel ||
123 channel_type != local->hw.conf.channel_type) {
124 local->hw.conf.channel = chan;
125 local->hw.conf.channel_type = channel_type;
126 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
129 if (!conf_is_ht(&local->hw.conf)) {
131 * mac80211.h documents that this is only valid
132 * when the channel is set to an HT type, and
133 * that otherwise STATIC is used.
135 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
136 } else if (local->hw.conf.smps_mode != local->smps_mode) {
137 local->hw.conf.smps_mode = local->smps_mode;
138 changed |= IEEE80211_CONF_CHANGE_SMPS;
142 power = chan->max_power;
144 power = local->power_constr_level ?
145 (chan->max_power - local->power_constr_level) :
148 if (local->user_power_level >= 0)
149 power = min(power, local->user_power_level);
151 if (local->hw.conf.power_level != power) {
152 changed |= IEEE80211_CONF_CHANGE_POWER;
153 local->hw.conf.power_level = power;
156 if (changed && local->open_count) {
157 ret = drv_config(local, changed);
160 * HW reconfiguration should never fail, the driver has told
161 * us what it can support so it should live up to that promise.
164 * rfkill is not integrated with mac80211 and a
165 * configuration command can thus fail if hardware rfkill
168 * FIXME: integrate rfkill with mac80211 and then add this
178 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
181 struct ieee80211_local *local = sdata->local;
182 static const u8 zero[ETH_ALEN] = { 0 };
187 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
189 * While not associated, claim a BSSID of all-zeroes
190 * so that drivers don't do any weird things with the
191 * BSSID at that time.
193 if (sdata->vif.bss_conf.assoc)
194 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
196 sdata->vif.bss_conf.bssid = zero;
197 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
198 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
199 else if (sdata->vif.type == NL80211_IFTYPE_AP)
200 sdata->vif.bss_conf.bssid = sdata->vif.addr;
201 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
202 sdata->vif.bss_conf.bssid = zero;
208 switch (sdata->vif.type) {
209 case NL80211_IFTYPE_AP:
210 case NL80211_IFTYPE_ADHOC:
211 case NL80211_IFTYPE_MESH_POINT:
214 /* do not warn to simplify caller in scan.c */
215 changed &= ~BSS_CHANGED_BEACON_ENABLED;
216 if (WARN_ON(changed & BSS_CHANGED_BEACON))
221 if (changed & BSS_CHANGED_BEACON_ENABLED) {
222 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
223 test_bit(SCAN_SW_SCANNING, &local->scanning)) {
224 sdata->vif.bss_conf.enable_beacon = false;
227 * Beacon should be enabled, but AP mode must
228 * check whether there is a beacon configured.
230 switch (sdata->vif.type) {
231 case NL80211_IFTYPE_AP:
232 sdata->vif.bss_conf.enable_beacon =
233 !!sdata->u.ap.beacon;
235 case NL80211_IFTYPE_ADHOC:
236 sdata->vif.bss_conf.enable_beacon =
237 !!sdata->u.ibss.presp;
239 case NL80211_IFTYPE_MESH_POINT:
240 sdata->vif.bss_conf.enable_beacon = true;
250 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
253 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
255 sdata->vif.bss_conf.use_cts_prot = false;
256 sdata->vif.bss_conf.use_short_preamble = false;
257 sdata->vif.bss_conf.use_short_slot = false;
258 return BSS_CHANGED_ERP_CTS_PROT |
259 BSS_CHANGED_ERP_PREAMBLE |
260 BSS_CHANGED_ERP_SLOT;
263 static void ieee80211_tasklet_handler(unsigned long data)
265 struct ieee80211_local *local = (struct ieee80211_local *) data;
268 while ((skb = skb_dequeue(&local->skb_queue)) ||
269 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
270 switch (skb->pkt_type) {
271 case IEEE80211_RX_MSG:
272 /* Clear skb->pkt_type in order to not confuse kernel
275 ieee80211_rx(local_to_hw(local), skb);
277 case IEEE80211_TX_STATUS_MSG:
279 ieee80211_tx_status(local_to_hw(local), skb);
282 WARN(1, "mac80211: Packet is of unknown type %d\n",
290 static void ieee80211_restart_work(struct work_struct *work)
292 struct ieee80211_local *local =
293 container_of(work, struct ieee80211_local, restart_work);
296 ieee80211_reconfig(local);
300 void ieee80211_restart_hw(struct ieee80211_hw *hw)
302 struct ieee80211_local *local = hw_to_local(hw);
304 trace_api_restart_hw(local);
306 /* use this reason, __ieee80211_resume will unblock it */
307 ieee80211_stop_queues_by_reason(hw,
308 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
310 schedule_work(&local->restart_work);
312 EXPORT_SYMBOL(ieee80211_restart_hw);
314 static void ieee80211_recalc_smps_work(struct work_struct *work)
316 struct ieee80211_local *local =
317 container_of(work, struct ieee80211_local, recalc_smps);
319 mutex_lock(&local->iflist_mtx);
320 ieee80211_recalc_smps(local, NULL);
321 mutex_unlock(&local->iflist_mtx);
325 static int ieee80211_ifa_changed(struct notifier_block *nb,
326 unsigned long data, void *arg)
328 struct in_ifaddr *ifa = arg;
329 struct ieee80211_local *local =
330 container_of(nb, struct ieee80211_local,
332 struct net_device *ndev = ifa->ifa_dev->dev;
333 struct wireless_dev *wdev = ndev->ieee80211_ptr;
334 struct in_device *idev;
335 struct ieee80211_sub_if_data *sdata;
336 struct ieee80211_bss_conf *bss_conf;
337 struct ieee80211_if_managed *ifmgd;
340 if (!netif_running(ndev))
343 /* Make sure it's our interface that got changed */
347 if (wdev->wiphy != local->hw.wiphy)
350 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
351 bss_conf = &sdata->vif.bss_conf;
353 /* ARP filtering is only supported in managed mode */
354 if (sdata->vif.type != NL80211_IFTYPE_STATION)
357 idev = sdata->dev->ip_ptr;
361 ifmgd = &sdata->u.mgd;
362 mutex_lock(&ifmgd->mtx);
364 /* Copy the addresses to the bss_conf list */
365 ifa = idev->ifa_list;
366 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
367 bss_conf->arp_addr_list[c] = ifa->ifa_address;
372 /* If not all addresses fit the list, disable filtering */
374 sdata->arp_filter_state = false;
377 sdata->arp_filter_state = true;
379 bss_conf->arp_addr_cnt = c;
381 /* Configure driver only if associated */
382 if (ifmgd->associated) {
383 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
384 ieee80211_bss_info_change_notify(sdata,
385 BSS_CHANGED_ARP_FILTER);
388 mutex_unlock(&ifmgd->mtx);
394 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
395 const struct ieee80211_ops *ops)
397 struct ieee80211_local *local;
401 /* Ensure 32-byte alignment of our private data and hw private data.
402 * We use the wiphy priv data for both our ieee80211_local and for
403 * the driver's private data
405 * In memory it'll be like this:
407 * +-------------------------+
409 * +-------------------------+
410 * | struct ieee80211_local |
411 * +-------------------------+
412 * | driver's private data |
413 * +-------------------------+
416 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
418 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
423 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
424 WIPHY_FLAG_4ADDR_AP |
425 WIPHY_FLAG_4ADDR_STATION;
426 wiphy->privid = mac80211_wiphy_privid;
428 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
430 local = wiphy_priv(wiphy);
432 local->hw.wiphy = wiphy;
434 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
439 BUG_ON(!ops->config);
440 BUG_ON(!ops->add_interface);
441 BUG_ON(!ops->remove_interface);
442 BUG_ON(!ops->configure_filter);
445 /* set up some defaults */
446 local->hw.queues = 1;
447 local->hw.max_rates = 1;
448 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
449 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
450 local->user_power_level = -1;
451 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
452 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
454 INIT_LIST_HEAD(&local->interfaces);
456 __hw_addr_init(&local->mc_list);
458 mutex_init(&local->iflist_mtx);
459 mutex_init(&local->scan_mtx);
461 mutex_init(&local->key_mtx);
462 spin_lock_init(&local->filter_lock);
463 spin_lock_init(&local->queue_stop_reason_lock);
465 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
467 ieee80211_work_init(local);
469 INIT_WORK(&local->restart_work, ieee80211_restart_work);
471 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
472 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
473 local->smps_mode = IEEE80211_SMPS_OFF;
475 INIT_WORK(&local->dynamic_ps_enable_work,
476 ieee80211_dynamic_ps_enable_work);
477 INIT_WORK(&local->dynamic_ps_disable_work,
478 ieee80211_dynamic_ps_disable_work);
479 setup_timer(&local->dynamic_ps_timer,
480 ieee80211_dynamic_ps_timer, (unsigned long) local);
482 sta_info_init(local);
484 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
485 skb_queue_head_init(&local->pending[i]);
486 atomic_set(&local->agg_queue_stop[i], 0);
488 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
489 (unsigned long)local);
491 tasklet_init(&local->tasklet,
492 ieee80211_tasklet_handler,
493 (unsigned long) local);
495 skb_queue_head_init(&local->skb_queue);
496 skb_queue_head_init(&local->skb_queue_unreliable);
498 return local_to_hw(local);
500 EXPORT_SYMBOL(ieee80211_alloc_hw);
502 int ieee80211_register_hw(struct ieee80211_hw *hw)
504 struct ieee80211_local *local = hw_to_local(hw);
506 enum ieee80211_band band;
507 int channels, max_bitrates;
509 static const u32 cipher_suites[] = {
510 WLAN_CIPHER_SUITE_WEP40,
511 WLAN_CIPHER_SUITE_WEP104,
512 WLAN_CIPHER_SUITE_TKIP,
513 WLAN_CIPHER_SUITE_CCMP,
515 /* keep last -- depends on hw flags! */
516 WLAN_CIPHER_SUITE_AES_CMAC
520 * generic code guarantees at least one band,
521 * set this very early because much code assumes
522 * that hw.conf.channel is assigned
527 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
528 struct ieee80211_supported_band *sband;
530 sband = local->hw.wiphy->bands[band];
533 if (!local->oper_channel) {
534 /* init channel we're on */
535 local->hw.conf.channel =
536 local->oper_channel = &sband->channels[0];
537 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
539 channels += sband->n_channels;
541 if (max_bitrates < sband->n_bitrates)
542 max_bitrates = sband->n_bitrates;
543 supp_ht = supp_ht || sband->ht_cap.ht_supported;
546 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
547 sizeof(void *) * channels, GFP_KERNEL);
548 if (!local->int_scan_req)
551 /* if low-level driver supports AP, we also support VLAN */
552 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
553 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
555 /* mac80211 always supports monitor */
556 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
558 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
559 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
560 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
561 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
563 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
564 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
565 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
568 * Calculate scan IE length -- we need this to alloc
569 * memory and to subtract from the driver limit. It
570 * includes the (extended) supported rates and HT
571 * information -- SSID is the driver's responsibility.
573 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
575 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
577 if (!local->ops->hw_scan) {
578 /* For hw_scan, driver needs to set these up. */
579 local->hw.wiphy->max_scan_ssids = 4;
580 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
584 * If the driver supports any scan IEs, then assume the
585 * limit includes the IEs mac80211 will add, otherwise
586 * leave it at zero and let the driver sort it out; we
587 * still pass our IEs to the driver but userspace will
588 * not be allowed to in that case.
590 if (local->hw.wiphy->max_scan_ie_len)
591 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
593 local->hw.wiphy->cipher_suites = cipher_suites;
594 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
595 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
596 local->hw.wiphy->n_cipher_suites--;
598 result = wiphy_register(local->hw.wiphy);
600 goto fail_wiphy_register;
603 * We use the number of queues for feature tests (QoS, HT) internally
604 * so restrict them appropriately.
606 if (hw->queues > IEEE80211_MAX_QUEUES)
607 hw->queues = IEEE80211_MAX_QUEUES;
610 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
611 if (!local->workqueue) {
617 * The hardware needs headroom for sending the frame,
618 * and we need some headroom for passing the frame to monitor
619 * interfaces, but never both at the same time.
621 BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
622 sizeof(struct ieee80211_tx_status_rtap_hdr));
623 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
624 sizeof(struct ieee80211_tx_status_rtap_hdr));
626 debugfs_hw_add(local);
629 * if the driver doesn't specify a max listen interval we
630 * use 5 which should be a safe default
632 if (local->hw.max_listen_interval == 0)
633 local->hw.max_listen_interval = 5;
635 local->hw.conf.listen_interval = local->hw.max_listen_interval;
637 local->dynamic_ps_forced_timeout = -1;
639 result = sta_info_start(local);
643 result = ieee80211_wep_init(local);
645 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
646 wiphy_name(local->hw.wiphy), result);
650 result = ieee80211_init_rate_ctrl_alg(local,
651 hw->rate_control_algorithm);
653 printk(KERN_DEBUG "%s: Failed to initialize rate control "
654 "algorithm\n", wiphy_name(local->hw.wiphy));
658 /* add one default STA interface if supported */
659 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
660 result = ieee80211_if_add(local, "wlan%d", NULL,
661 NL80211_IFTYPE_STATION, NULL);
663 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
664 wiphy_name(local->hw.wiphy));
669 ieee80211_led_init(local);
671 local->network_latency_notifier.notifier_call =
672 ieee80211_max_network_latency;
673 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
674 &local->network_latency_notifier);
681 local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
682 result = register_inetaddr_notifier(&local->ifa_notifier);
691 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
692 &local->network_latency_notifier);
696 ieee80211_led_exit(local);
697 ieee80211_remove_interfaces(local);
700 ieee80211_wep_free(local);
701 sta_info_stop(local);
703 destroy_workqueue(local->workqueue);
705 wiphy_unregister(local->hw.wiphy);
707 kfree(local->int_scan_req);
710 EXPORT_SYMBOL(ieee80211_register_hw);
712 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
714 struct ieee80211_local *local = hw_to_local(hw);
716 tasklet_kill(&local->tx_pending_tasklet);
717 tasklet_kill(&local->tasklet);
719 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
720 &local->network_latency_notifier);
722 unregister_inetaddr_notifier(&local->ifa_notifier);
728 * At this point, interface list manipulations are fine
729 * because the driver cannot be handing us frames any
730 * more and the tasklet is killed.
732 ieee80211_remove_interfaces(local);
737 * Now all work items will be gone, but the
738 * timer might still be armed, so delete it
740 del_timer_sync(&local->work_timer);
742 cancel_work_sync(&local->reconfig_filter);
744 ieee80211_clear_tx_pending(local);
745 sta_info_stop(local);
746 rate_control_deinitialize(local);
748 if (skb_queue_len(&local->skb_queue) ||
749 skb_queue_len(&local->skb_queue_unreliable))
750 printk(KERN_WARNING "%s: skb_queue not empty\n",
751 wiphy_name(local->hw.wiphy));
752 skb_queue_purge(&local->skb_queue);
753 skb_queue_purge(&local->skb_queue_unreliable);
755 destroy_workqueue(local->workqueue);
756 wiphy_unregister(local->hw.wiphy);
757 ieee80211_wep_free(local);
758 ieee80211_led_exit(local);
759 kfree(local->int_scan_req);
761 EXPORT_SYMBOL(ieee80211_unregister_hw);
763 void ieee80211_free_hw(struct ieee80211_hw *hw)
765 struct ieee80211_local *local = hw_to_local(hw);
767 mutex_destroy(&local->iflist_mtx);
768 mutex_destroy(&local->scan_mtx);
770 wiphy_free(local->hw.wiphy);
772 EXPORT_SYMBOL(ieee80211_free_hw);
774 static int __init ieee80211_init(void)
779 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
780 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
781 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
783 ret = rc80211_minstrel_init();
787 ret = rc80211_minstrel_ht_init();
791 ret = rc80211_pid_init();
795 ret = ieee80211_iface_init();
803 rc80211_minstrel_ht_exit();
805 rc80211_minstrel_exit();
810 static void __exit ieee80211_exit(void)
813 rc80211_minstrel_ht_exit();
814 rc80211_minstrel_exit();
817 * For key todo, it'll be empty by now but the work
818 * might still be scheduled.
820 flush_scheduled_work();
825 ieee80211_iface_exit();
829 subsys_initcall(ieee80211_init);
830 module_exit(ieee80211_exit);
832 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
833 MODULE_LICENSE("GPL");