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/wireless.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/bitmap.h>
23 #include <linux/pm_qos_params.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
35 #include "debugfs_netdev.h"
37 void ieee80211_configure_filter(struct ieee80211_local *local)
40 unsigned int changed_flags;
41 unsigned int new_flags = 0;
43 if (atomic_read(&local->iff_promiscs))
44 new_flags |= FIF_PROMISC_IN_BSS;
46 if (atomic_read(&local->iff_allmultis))
47 new_flags |= FIF_ALLMULTI;
49 if (local->monitors || local->scanning)
50 new_flags |= FIF_BCN_PRBRESP_PROMISC;
52 if (local->fif_fcsfail)
53 new_flags |= FIF_FCSFAIL;
55 if (local->fif_plcpfail)
56 new_flags |= FIF_PLCPFAIL;
58 if (local->fif_control)
59 new_flags |= FIF_CONTROL;
61 if (local->fif_other_bss)
62 new_flags |= FIF_OTHER_BSS;
64 if (local->fif_pspoll)
65 new_flags |= FIF_PSPOLL;
67 spin_lock_bh(&local->filter_lock);
68 changed_flags = local->filter_flags ^ new_flags;
70 mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
71 spin_unlock_bh(&local->filter_lock);
76 drv_configure_filter(local, changed_flags, &new_flags, mc);
78 WARN_ON(new_flags & (1<<31));
80 local->filter_flags = new_flags & ~(1<<31);
83 static void ieee80211_reconfig_filter(struct work_struct *work)
85 struct ieee80211_local *local =
86 container_of(work, struct ieee80211_local, reconfig_filter);
88 ieee80211_configure_filter(local);
91 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
93 struct ieee80211_channel *chan, *scan_chan;
96 enum nl80211_channel_type channel_type;
100 scan_chan = local->scan_channel;
104 channel_type = NL80211_CHAN_NO_HT;
106 chan = local->oper_channel;
107 channel_type = local->oper_channel_type;
110 if (chan != local->hw.conf.channel ||
111 channel_type != local->hw.conf.channel_type) {
112 local->hw.conf.channel = chan;
113 local->hw.conf.channel_type = channel_type;
114 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
118 power = chan->max_power;
120 power = local->power_constr_level ?
121 (chan->max_power - local->power_constr_level) :
124 if (local->user_power_level >= 0)
125 power = min(power, local->user_power_level);
127 if (local->hw.conf.power_level != power) {
128 changed |= IEEE80211_CONF_CHANGE_POWER;
129 local->hw.conf.power_level = power;
132 if (changed && local->open_count) {
133 ret = drv_config(local, changed);
136 * HW reconfiguration should never fail, the driver has told
137 * us what it can support so it should live up to that promise.
140 * rfkill is not integrated with mac80211 and a
141 * configuration command can thus fail if hardware rfkill
144 * FIXME: integrate rfkill with mac80211 and then add this
154 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
157 struct ieee80211_local *local = sdata->local;
158 static const u8 zero[ETH_ALEN] = { 0 };
163 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
165 * While not associated, claim a BSSID of all-zeroes
166 * so that drivers don't do any weird things with the
167 * BSSID at that time.
169 if (sdata->vif.bss_conf.assoc)
170 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
172 sdata->vif.bss_conf.bssid = zero;
173 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
174 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
175 else if (sdata->vif.type == NL80211_IFTYPE_AP)
176 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
177 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
178 sdata->vif.bss_conf.bssid = zero;
184 switch (sdata->vif.type) {
185 case NL80211_IFTYPE_AP:
186 case NL80211_IFTYPE_ADHOC:
187 case NL80211_IFTYPE_MESH_POINT:
190 /* do not warn to simplify caller in scan.c */
191 changed &= ~BSS_CHANGED_BEACON_ENABLED;
192 if (WARN_ON(changed & BSS_CHANGED_BEACON))
197 if (changed & BSS_CHANGED_BEACON_ENABLED) {
198 if (local->quiescing || !netif_running(sdata->dev) ||
199 test_bit(SCAN_SW_SCANNING, &local->scanning)) {
200 sdata->vif.bss_conf.enable_beacon = false;
203 * Beacon should be enabled, but AP mode must
204 * check whether there is a beacon configured.
206 switch (sdata->vif.type) {
207 case NL80211_IFTYPE_AP:
208 sdata->vif.bss_conf.enable_beacon =
209 !!rcu_dereference(sdata->u.ap.beacon);
211 case NL80211_IFTYPE_ADHOC:
212 sdata->vif.bss_conf.enable_beacon =
213 !!rcu_dereference(sdata->u.ibss.presp);
215 case NL80211_IFTYPE_MESH_POINT:
216 sdata->vif.bss_conf.enable_beacon = true;
226 drv_bss_info_changed(local, &sdata->vif,
227 &sdata->vif.bss_conf, changed);
230 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
232 sdata->vif.bss_conf.use_cts_prot = false;
233 sdata->vif.bss_conf.use_short_preamble = false;
234 sdata->vif.bss_conf.use_short_slot = false;
235 return BSS_CHANGED_ERP_CTS_PROT |
236 BSS_CHANGED_ERP_PREAMBLE |
237 BSS_CHANGED_ERP_SLOT;
240 static void ieee80211_tasklet_handler(unsigned long data)
242 struct ieee80211_local *local = (struct ieee80211_local *) data;
244 struct ieee80211_ra_tid *ra_tid;
246 while ((skb = skb_dequeue(&local->skb_queue)) ||
247 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
248 switch (skb->pkt_type) {
249 case IEEE80211_RX_MSG:
250 /* Clear skb->pkt_type in order to not confuse kernel
253 ieee80211_rx(local_to_hw(local), skb);
255 case IEEE80211_TX_STATUS_MSG:
257 ieee80211_tx_status(local_to_hw(local), skb);
259 case IEEE80211_DELBA_MSG:
260 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
261 ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
265 case IEEE80211_ADDBA_MSG:
266 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
267 ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
272 WARN(1, "mac80211: Packet is of unknown type %d\n",
280 static void ieee80211_restart_work(struct work_struct *work)
282 struct ieee80211_local *local =
283 container_of(work, struct ieee80211_local, restart_work);
286 ieee80211_reconfig(local);
290 void ieee80211_restart_hw(struct ieee80211_hw *hw)
292 struct ieee80211_local *local = hw_to_local(hw);
294 /* use this reason, __ieee80211_resume will unblock it */
295 ieee80211_stop_queues_by_reason(hw,
296 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
298 schedule_work(&local->restart_work);
300 EXPORT_SYMBOL(ieee80211_restart_hw);
302 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
303 const struct ieee80211_ops *ops)
305 struct ieee80211_local *local;
309 /* Ensure 32-byte alignment of our private data and hw private data.
310 * We use the wiphy priv data for both our ieee80211_local and for
311 * the driver's private data
313 * In memory it'll be like this:
315 * +-------------------------+
317 * +-------------------------+
318 * | struct ieee80211_local |
319 * +-------------------------+
320 * | driver's private data |
321 * +-------------------------+
324 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
326 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
331 wiphy->netnsok = true;
332 wiphy->privid = mac80211_wiphy_privid;
334 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
335 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
336 sizeof(struct cfg80211_bss);
338 local = wiphy_priv(wiphy);
340 local->hw.wiphy = wiphy;
342 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
347 BUG_ON(!ops->config);
348 BUG_ON(!ops->add_interface);
349 BUG_ON(!ops->remove_interface);
350 BUG_ON(!ops->configure_filter);
353 /* set up some defaults */
354 local->hw.queues = 1;
355 local->hw.max_rates = 1;
356 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
357 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
358 local->user_power_level = -1;
360 INIT_LIST_HEAD(&local->interfaces);
361 mutex_init(&local->iflist_mtx);
362 mutex_init(&local->scan_mtx);
364 spin_lock_init(&local->key_lock);
365 spin_lock_init(&local->filter_lock);
366 spin_lock_init(&local->queue_stop_reason_lock);
368 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
370 INIT_WORK(&local->restart_work, ieee80211_restart_work);
372 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
374 INIT_WORK(&local->dynamic_ps_enable_work,
375 ieee80211_dynamic_ps_enable_work);
376 INIT_WORK(&local->dynamic_ps_disable_work,
377 ieee80211_dynamic_ps_disable_work);
378 setup_timer(&local->dynamic_ps_timer,
379 ieee80211_dynamic_ps_timer, (unsigned long) local);
381 sta_info_init(local);
383 for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
384 skb_queue_head_init(&local->pending[i]);
385 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
386 (unsigned long)local);
388 tasklet_init(&local->tasklet,
389 ieee80211_tasklet_handler,
390 (unsigned long) local);
392 skb_queue_head_init(&local->skb_queue);
393 skb_queue_head_init(&local->skb_queue_unreliable);
395 spin_lock_init(&local->ampdu_lock);
397 return local_to_hw(local);
399 EXPORT_SYMBOL(ieee80211_alloc_hw);
401 int ieee80211_register_hw(struct ieee80211_hw *hw)
403 struct ieee80211_local *local = hw_to_local(hw);
405 enum ieee80211_band band;
406 int channels, i, j, max_bitrates;
408 static const u32 cipher_suites[] = {
409 WLAN_CIPHER_SUITE_WEP40,
410 WLAN_CIPHER_SUITE_WEP104,
411 WLAN_CIPHER_SUITE_TKIP,
412 WLAN_CIPHER_SUITE_CCMP,
414 /* keep last -- depends on hw flags! */
415 WLAN_CIPHER_SUITE_AES_CMAC
419 * generic code guarantees at least one band,
420 * set this very early because much code assumes
421 * that hw.conf.channel is assigned
426 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
427 struct ieee80211_supported_band *sband;
429 sband = local->hw.wiphy->bands[band];
432 if (!local->oper_channel) {
433 /* init channel we're on */
434 local->hw.conf.channel =
435 local->oper_channel = &sband->channels[0];
436 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
438 channels += sband->n_channels;
440 if (max_bitrates < sband->n_bitrates)
441 max_bitrates = sband->n_bitrates;
442 supp_ht = supp_ht || sband->ht_cap.ht_supported;
445 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
446 sizeof(void *) * channels, GFP_KERNEL);
447 if (!local->int_scan_req)
450 /* if low-level driver supports AP, we also support VLAN */
451 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
452 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
454 /* mac80211 always supports monitor */
455 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
457 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
458 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
459 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
460 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
463 * Calculate scan IE length -- we need this to alloc
464 * memory and to subtract from the driver limit. It
465 * includes the (extended) supported rates and HT
466 * information -- SSID is the driver's responsibility.
468 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
470 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
472 if (!local->ops->hw_scan) {
473 /* For hw_scan, driver needs to set these up. */
474 local->hw.wiphy->max_scan_ssids = 4;
475 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
479 * If the driver supports any scan IEs, then assume the
480 * limit includes the IEs mac80211 will add, otherwise
481 * leave it at zero and let the driver sort it out; we
482 * still pass our IEs to the driver but userspace will
483 * not be allowed to in that case.
485 if (local->hw.wiphy->max_scan_ie_len)
486 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
488 local->hw.wiphy->cipher_suites = cipher_suites;
489 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
490 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
491 local->hw.wiphy->n_cipher_suites--;
493 result = wiphy_register(local->hw.wiphy);
495 goto fail_wiphy_register;
498 * We use the number of queues for feature tests (QoS, HT) internally
499 * so restrict them appropriately.
501 if (hw->queues > IEEE80211_MAX_QUEUES)
502 hw->queues = IEEE80211_MAX_QUEUES;
505 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
506 if (!local->workqueue) {
512 * The hardware needs headroom for sending the frame,
513 * and we need some headroom for passing the frame to monitor
514 * interfaces, but never both at the same time.
516 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
517 sizeof(struct ieee80211_tx_status_rtap_hdr));
519 debugfs_hw_add(local);
521 if (local->hw.max_listen_interval == 0)
522 local->hw.max_listen_interval = 1;
524 local->hw.conf.listen_interval = local->hw.max_listen_interval;
526 result = sta_info_start(local);
530 result = ieee80211_wep_init(local);
532 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
533 wiphy_name(local->hw.wiphy), result);
539 result = ieee80211_init_rate_ctrl_alg(local,
540 hw->rate_control_algorithm);
542 printk(KERN_DEBUG "%s: Failed to initialize rate control "
543 "algorithm\n", wiphy_name(local->hw.wiphy));
547 /* add one default STA interface if supported */
548 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
549 result = ieee80211_if_add(local, "wlan%d", NULL,
550 NL80211_IFTYPE_STATION, NULL);
552 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
553 wiphy_name(local->hw.wiphy));
558 ieee80211_led_init(local);
560 /* alloc internal scan request */
562 local->int_scan_req->ssids = &local->scan_ssid;
563 local->int_scan_req->n_ssids = 1;
564 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
565 if (!hw->wiphy->bands[band])
567 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
568 local->int_scan_req->channels[i] =
569 &hw->wiphy->bands[band]->channels[j];
573 local->int_scan_req->n_channels = i;
575 local->network_latency_notifier.notifier_call =
576 ieee80211_max_network_latency;
577 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
578 &local->network_latency_notifier);
588 ieee80211_led_exit(local);
589 ieee80211_remove_interfaces(local);
592 ieee80211_wep_free(local);
594 sta_info_stop(local);
596 destroy_workqueue(local->workqueue);
598 wiphy_unregister(local->hw.wiphy);
600 kfree(local->int_scan_req);
603 EXPORT_SYMBOL(ieee80211_register_hw);
605 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
607 struct ieee80211_local *local = hw_to_local(hw);
609 tasklet_kill(&local->tx_pending_tasklet);
610 tasklet_kill(&local->tasklet);
612 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
613 &local->network_latency_notifier);
618 * At this point, interface list manipulations are fine
619 * because the driver cannot be handing us frames any
620 * more and the tasklet is killed.
622 ieee80211_remove_interfaces(local);
626 cancel_work_sync(&local->reconfig_filter);
628 ieee80211_clear_tx_pending(local);
629 sta_info_stop(local);
630 rate_control_deinitialize(local);
632 if (skb_queue_len(&local->skb_queue)
633 || skb_queue_len(&local->skb_queue_unreliable))
634 printk(KERN_WARNING "%s: skb_queue not empty\n",
635 wiphy_name(local->hw.wiphy));
636 skb_queue_purge(&local->skb_queue);
637 skb_queue_purge(&local->skb_queue_unreliable);
639 destroy_workqueue(local->workqueue);
640 wiphy_unregister(local->hw.wiphy);
641 ieee80211_wep_free(local);
642 ieee80211_led_exit(local);
643 kfree(local->int_scan_req);
645 EXPORT_SYMBOL(ieee80211_unregister_hw);
647 void ieee80211_free_hw(struct ieee80211_hw *hw)
649 struct ieee80211_local *local = hw_to_local(hw);
651 mutex_destroy(&local->iflist_mtx);
652 mutex_destroy(&local->scan_mtx);
654 wiphy_free(local->hw.wiphy);
656 EXPORT_SYMBOL(ieee80211_free_hw);
658 static int __init ieee80211_init(void)
663 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
664 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
665 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
667 ret = rc80211_minstrel_init();
671 ret = rc80211_pid_init();
675 ieee80211_debugfs_netdev_init();
680 static void __exit ieee80211_exit(void)
683 rc80211_minstrel_exit();
686 * For key todo, it'll be empty by now but the work
687 * might still be scheduled.
689 flush_scheduled_work();
694 ieee80211_debugfs_netdev_exit();
698 subsys_initcall(ieee80211_init);
699 module_exit(ieee80211_exit);
701 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
702 MODULE_LICENSE("GPL");