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_count, 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 !!rcu_dereference(sdata->u.ap.beacon);
230 case NL80211_IFTYPE_ADHOC:
231 sdata->vif.bss_conf.enable_beacon =
232 !!rcu_dereference(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;
262 struct ieee80211_ra_tid *ra_tid;
264 while ((skb = skb_dequeue(&local->skb_queue)) ||
265 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
266 switch (skb->pkt_type) {
267 case IEEE80211_RX_MSG:
268 /* Clear skb->pkt_type in order to not confuse kernel
271 ieee80211_rx(local_to_hw(local), skb);
273 case IEEE80211_TX_STATUS_MSG:
275 ieee80211_tx_status(local_to_hw(local), skb);
277 case IEEE80211_DELBA_MSG:
278 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
279 ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
283 case IEEE80211_ADDBA_MSG:
284 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
285 ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
290 WARN(1, "mac80211: Packet is of unknown type %d\n",
298 static void ieee80211_restart_work(struct work_struct *work)
300 struct ieee80211_local *local =
301 container_of(work, struct ieee80211_local, restart_work);
304 ieee80211_reconfig(local);
308 void ieee80211_restart_hw(struct ieee80211_hw *hw)
310 struct ieee80211_local *local = hw_to_local(hw);
312 /* use this reason, __ieee80211_resume will unblock it */
313 ieee80211_stop_queues_by_reason(hw,
314 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
316 schedule_work(&local->restart_work);
318 EXPORT_SYMBOL(ieee80211_restart_hw);
320 static void ieee80211_recalc_smps_work(struct work_struct *work)
322 struct ieee80211_local *local =
323 container_of(work, struct ieee80211_local, recalc_smps);
325 mutex_lock(&local->iflist_mtx);
326 ieee80211_recalc_smps(local, NULL);
327 mutex_unlock(&local->iflist_mtx);
330 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
331 const struct ieee80211_ops *ops)
333 struct ieee80211_local *local;
337 /* Ensure 32-byte alignment of our private data and hw private data.
338 * We use the wiphy priv data for both our ieee80211_local and for
339 * the driver's private data
341 * In memory it'll be like this:
343 * +-------------------------+
345 * +-------------------------+
346 * | struct ieee80211_local |
347 * +-------------------------+
348 * | driver's private data |
349 * +-------------------------+
352 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
354 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
359 wiphy->flags |= WIPHY_FLAG_NETNS_OK |
360 WIPHY_FLAG_4ADDR_AP |
361 WIPHY_FLAG_4ADDR_STATION;
362 wiphy->privid = mac80211_wiphy_privid;
364 wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
366 local = wiphy_priv(wiphy);
368 local->hw.wiphy = wiphy;
370 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
375 BUG_ON(!ops->config);
376 BUG_ON(!ops->add_interface);
377 BUG_ON(!ops->remove_interface);
378 BUG_ON(!ops->configure_filter);
381 /* set up some defaults */
382 local->hw.queues = 1;
383 local->hw.max_rates = 1;
384 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
385 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
386 local->user_power_level = -1;
388 INIT_LIST_HEAD(&local->interfaces);
389 mutex_init(&local->iflist_mtx);
390 mutex_init(&local->scan_mtx);
392 spin_lock_init(&local->key_lock);
393 spin_lock_init(&local->filter_lock);
394 spin_lock_init(&local->queue_stop_reason_lock);
396 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
398 ieee80211_work_init(local);
400 INIT_WORK(&local->restart_work, ieee80211_restart_work);
402 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
403 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
404 local->smps_mode = IEEE80211_SMPS_OFF;
406 INIT_WORK(&local->dynamic_ps_enable_work,
407 ieee80211_dynamic_ps_enable_work);
408 INIT_WORK(&local->dynamic_ps_disable_work,
409 ieee80211_dynamic_ps_disable_work);
410 setup_timer(&local->dynamic_ps_timer,
411 ieee80211_dynamic_ps_timer, (unsigned long) local);
413 sta_info_init(local);
415 for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
416 skb_queue_head_init(&local->pending[i]);
417 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
418 (unsigned long)local);
420 tasklet_init(&local->tasklet,
421 ieee80211_tasklet_handler,
422 (unsigned long) local);
424 skb_queue_head_init(&local->skb_queue);
425 skb_queue_head_init(&local->skb_queue_unreliable);
427 spin_lock_init(&local->ampdu_lock);
429 return local_to_hw(local);
431 EXPORT_SYMBOL(ieee80211_alloc_hw);
433 int ieee80211_register_hw(struct ieee80211_hw *hw)
435 struct ieee80211_local *local = hw_to_local(hw);
437 enum ieee80211_band band;
438 int channels, i, j, max_bitrates;
440 static const u32 cipher_suites[] = {
441 WLAN_CIPHER_SUITE_WEP40,
442 WLAN_CIPHER_SUITE_WEP104,
443 WLAN_CIPHER_SUITE_TKIP,
444 WLAN_CIPHER_SUITE_CCMP,
446 /* keep last -- depends on hw flags! */
447 WLAN_CIPHER_SUITE_AES_CMAC
451 * generic code guarantees at least one band,
452 * set this very early because much code assumes
453 * that hw.conf.channel is assigned
458 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
459 struct ieee80211_supported_band *sband;
461 sband = local->hw.wiphy->bands[band];
464 if (!local->oper_channel) {
465 /* init channel we're on */
466 local->hw.conf.channel =
467 local->oper_channel = &sband->channels[0];
468 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
470 channels += sband->n_channels;
472 if (max_bitrates < sband->n_bitrates)
473 max_bitrates = sband->n_bitrates;
474 supp_ht = supp_ht || sband->ht_cap.ht_supported;
477 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
478 sizeof(void *) * channels, GFP_KERNEL);
479 if (!local->int_scan_req)
482 /* if low-level driver supports AP, we also support VLAN */
483 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
484 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
486 /* mac80211 always supports monitor */
487 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
489 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
490 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
491 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
492 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
494 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
495 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
496 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
499 * Calculate scan IE length -- we need this to alloc
500 * memory and to subtract from the driver limit. It
501 * includes the (extended) supported rates and HT
502 * information -- SSID is the driver's responsibility.
504 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
506 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
508 if (!local->ops->hw_scan) {
509 /* For hw_scan, driver needs to set these up. */
510 local->hw.wiphy->max_scan_ssids = 4;
511 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
515 * If the driver supports any scan IEs, then assume the
516 * limit includes the IEs mac80211 will add, otherwise
517 * leave it at zero and let the driver sort it out; we
518 * still pass our IEs to the driver but userspace will
519 * not be allowed to in that case.
521 if (local->hw.wiphy->max_scan_ie_len)
522 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
524 local->hw.wiphy->cipher_suites = cipher_suites;
525 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
526 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
527 local->hw.wiphy->n_cipher_suites--;
529 result = wiphy_register(local->hw.wiphy);
531 goto fail_wiphy_register;
534 * We use the number of queues for feature tests (QoS, HT) internally
535 * so restrict them appropriately.
537 if (hw->queues > IEEE80211_MAX_QUEUES)
538 hw->queues = IEEE80211_MAX_QUEUES;
541 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
542 if (!local->workqueue) {
548 * The hardware needs headroom for sending the frame,
549 * and we need some headroom for passing the frame to monitor
550 * interfaces, but never both at the same time.
552 BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
553 sizeof(struct ieee80211_tx_status_rtap_hdr));
554 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
555 sizeof(struct ieee80211_tx_status_rtap_hdr));
557 debugfs_hw_add(local);
559 if (local->hw.max_listen_interval == 0)
560 local->hw.max_listen_interval = 1;
562 local->hw.conf.listen_interval = local->hw.max_listen_interval;
564 result = sta_info_start(local);
568 result = ieee80211_wep_init(local);
570 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
571 wiphy_name(local->hw.wiphy), result);
577 result = ieee80211_init_rate_ctrl_alg(local,
578 hw->rate_control_algorithm);
580 printk(KERN_DEBUG "%s: Failed to initialize rate control "
581 "algorithm\n", wiphy_name(local->hw.wiphy));
585 /* add one default STA interface if supported */
586 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
587 result = ieee80211_if_add(local, "wlan%d", NULL,
588 NL80211_IFTYPE_STATION, NULL);
590 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
591 wiphy_name(local->hw.wiphy));
596 ieee80211_led_init(local);
598 /* alloc internal scan request */
600 local->int_scan_req->ssids = &local->scan_ssid;
601 local->int_scan_req->n_ssids = 1;
602 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
603 if (!hw->wiphy->bands[band])
605 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
606 local->int_scan_req->channels[i] =
607 &hw->wiphy->bands[band]->channels[j];
611 local->int_scan_req->n_channels = i;
613 local->network_latency_notifier.notifier_call =
614 ieee80211_max_network_latency;
615 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
616 &local->network_latency_notifier);
626 ieee80211_led_exit(local);
627 ieee80211_remove_interfaces(local);
630 ieee80211_wep_free(local);
632 sta_info_stop(local);
634 destroy_workqueue(local->workqueue);
636 wiphy_unregister(local->hw.wiphy);
638 kfree(local->int_scan_req);
641 EXPORT_SYMBOL(ieee80211_register_hw);
643 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
645 struct ieee80211_local *local = hw_to_local(hw);
647 tasklet_kill(&local->tx_pending_tasklet);
648 tasklet_kill(&local->tasklet);
650 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
651 &local->network_latency_notifier);
656 * At this point, interface list manipulations are fine
657 * because the driver cannot be handing us frames any
658 * more and the tasklet is killed.
660 ieee80211_remove_interfaces(local);
664 cancel_work_sync(&local->reconfig_filter);
666 ieee80211_clear_tx_pending(local);
667 sta_info_stop(local);
668 rate_control_deinitialize(local);
670 if (skb_queue_len(&local->skb_queue) ||
671 skb_queue_len(&local->skb_queue_unreliable))
672 printk(KERN_WARNING "%s: skb_queue not empty\n",
673 wiphy_name(local->hw.wiphy));
674 skb_queue_purge(&local->skb_queue);
675 skb_queue_purge(&local->skb_queue_unreliable);
677 destroy_workqueue(local->workqueue);
678 wiphy_unregister(local->hw.wiphy);
679 ieee80211_wep_free(local);
680 ieee80211_led_exit(local);
681 kfree(local->int_scan_req);
683 EXPORT_SYMBOL(ieee80211_unregister_hw);
685 void ieee80211_free_hw(struct ieee80211_hw *hw)
687 struct ieee80211_local *local = hw_to_local(hw);
689 mutex_destroy(&local->iflist_mtx);
690 mutex_destroy(&local->scan_mtx);
692 wiphy_free(local->hw.wiphy);
694 EXPORT_SYMBOL(ieee80211_free_hw);
696 static int __init ieee80211_init(void)
701 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
702 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
703 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
705 ret = rc80211_minstrel_init();
709 ret = rc80211_pid_init();
713 ret = ieee80211_iface_init();
721 rc80211_minstrel_exit();
726 static void __exit ieee80211_exit(void)
729 rc80211_minstrel_exit();
732 * For key todo, it'll be empty by now but the work
733 * might still be scheduled.
735 flush_scheduled_work();
740 ieee80211_iface_exit();
744 subsys_initcall(ieee80211_init);
745 module_exit(ieee80211_exit);
747 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
748 MODULE_LICENSE("GPL");