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 <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/bitmap.h>
24 #include <linux/pm_qos_params.h>
25 #include <net/net_namespace.h>
26 #include <net/cfg80211.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
38 #include "debugfs_netdev.h"
41 * For seeing transmitted packets on monitor interfaces
42 * we have a radiotap header too.
44 struct ieee80211_tx_status_rtap_hdr {
45 struct ieee80211_radiotap_header hdr;
50 } __attribute__ ((packed));
53 /* must be called under mdev tx lock */
54 void ieee80211_configure_filter(struct ieee80211_local *local)
56 unsigned int changed_flags;
57 unsigned int new_flags = 0;
59 if (atomic_read(&local->iff_promiscs))
60 new_flags |= FIF_PROMISC_IN_BSS;
62 if (atomic_read(&local->iff_allmultis))
63 new_flags |= FIF_ALLMULTI;
66 new_flags |= FIF_BCN_PRBRESP_PROMISC;
68 if (local->fif_fcsfail)
69 new_flags |= FIF_FCSFAIL;
71 if (local->fif_plcpfail)
72 new_flags |= FIF_PLCPFAIL;
74 if (local->fif_control)
75 new_flags |= FIF_CONTROL;
77 if (local->fif_other_bss)
78 new_flags |= FIF_OTHER_BSS;
80 changed_flags = local->filter_flags ^ new_flags;
85 drv_configure_filter(local, changed_flags, &new_flags,
86 local->mdev->mc_count,
87 local->mdev->mc_list);
89 WARN_ON(new_flags & (1<<31));
91 local->filter_flags = new_flags & ~(1<<31);
94 /* master interface */
96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
98 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
102 static const struct header_ops ieee80211_header_ops = {
103 .create = eth_header,
104 .parse = header_parse_80211,
105 .rebuild = eth_rebuild_header,
106 .cache = eth_header_cache,
107 .cache_update = eth_header_cache_update,
110 static int ieee80211_master_open(struct net_device *dev)
112 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
113 struct ieee80211_local *local = mpriv->local;
114 struct ieee80211_sub_if_data *sdata;
115 int res = -EOPNOTSUPP;
117 /* we hold the RTNL here so can safely walk the list */
118 list_for_each_entry(sdata, &local->interfaces, list) {
119 if (netif_running(sdata->dev)) {
128 netif_tx_start_all_queues(local->mdev);
133 static int ieee80211_master_stop(struct net_device *dev)
135 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
136 struct ieee80211_local *local = mpriv->local;
137 struct ieee80211_sub_if_data *sdata;
139 /* we hold the RTNL here so can safely walk the list */
140 list_for_each_entry(sdata, &local->interfaces, list)
141 if (netif_running(sdata->dev))
142 dev_close(sdata->dev);
147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
149 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
150 struct ieee80211_local *local = mpriv->local;
152 ieee80211_configure_filter(local);
155 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
157 struct ieee80211_channel *chan, *scan_chan;
160 enum nl80211_channel_type channel_type;
164 scan_chan = local->scan_channel;
168 channel_type = NL80211_CHAN_NO_HT;
170 chan = local->oper_channel;
171 channel_type = local->oper_channel_type;
174 if (chan != local->hw.conf.channel ||
175 channel_type != local->hw.conf.channel_type) {
176 local->hw.conf.channel = chan;
177 local->hw.conf.channel_type = channel_type;
178 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
182 power = chan->max_power;
184 power = local->power_constr_level ?
185 (chan->max_power - local->power_constr_level) :
188 if (local->user_power_level >= 0)
189 power = min(power, local->user_power_level);
191 if (local->hw.conf.power_level != power) {
192 changed |= IEEE80211_CONF_CHANGE_POWER;
193 local->hw.conf.power_level = power;
196 if (changed && local->open_count) {
197 ret = drv_config(local, changed);
200 * HW reconfiguration should never fail, the driver has told
201 * us what it can support so it should live up to that promise.
204 * rfkill is not integrated with mac80211 and a
205 * configuration command can thus fail if hardware rfkill
208 * FIXME: integrate rfkill with mac80211 and then add this
218 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
221 struct ieee80211_local *local = sdata->local;
222 static const u8 zero[ETH_ALEN] = { 0 };
227 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
229 * While not associated, claim a BSSID of all-zeroes
230 * so that drivers don't do any weird things with the
231 * BSSID at that time.
233 if (sdata->vif.bss_conf.assoc)
234 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
236 sdata->vif.bss_conf.bssid = zero;
237 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
238 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
239 else if (sdata->vif.type == NL80211_IFTYPE_AP)
240 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
241 else if (ieee80211_vif_is_mesh(&sdata->vif)) {
242 sdata->vif.bss_conf.bssid = zero;
248 switch (sdata->vif.type) {
249 case NL80211_IFTYPE_AP:
250 case NL80211_IFTYPE_ADHOC:
251 case NL80211_IFTYPE_MESH_POINT:
254 /* do not warn to simplify caller in scan.c */
255 changed &= ~BSS_CHANGED_BEACON_ENABLED;
256 if (WARN_ON(changed & BSS_CHANGED_BEACON))
261 if (changed & BSS_CHANGED_BEACON_ENABLED) {
262 if (local->sw_scanning) {
263 sdata->vif.bss_conf.enable_beacon = false;
266 * Beacon should be enabled, but AP mode must
267 * check whether there is a beacon configured.
269 switch (sdata->vif.type) {
270 case NL80211_IFTYPE_AP:
271 sdata->vif.bss_conf.enable_beacon =
272 !!rcu_dereference(sdata->u.ap.beacon);
274 case NL80211_IFTYPE_ADHOC:
275 sdata->vif.bss_conf.enable_beacon =
276 !!rcu_dereference(sdata->u.ibss.presp);
278 case NL80211_IFTYPE_MESH_POINT:
279 sdata->vif.bss_conf.enable_beacon = true;
289 drv_bss_info_changed(local, &sdata->vif,
290 &sdata->vif.bss_conf, changed);
295 * ~changed is just there to not do this at resume time
297 if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
298 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
299 ieee80211_hw_config(local,
300 _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
304 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
306 sdata->vif.bss_conf.use_cts_prot = false;
307 sdata->vif.bss_conf.use_short_preamble = false;
308 sdata->vif.bss_conf.use_short_slot = false;
309 return BSS_CHANGED_ERP_CTS_PROT |
310 BSS_CHANGED_ERP_PREAMBLE |
311 BSS_CHANGED_ERP_SLOT;
314 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
317 struct ieee80211_local *local = hw_to_local(hw);
318 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
321 skb->dev = local->mdev;
322 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
323 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
324 &local->skb_queue : &local->skb_queue_unreliable, skb);
325 tmp = skb_queue_len(&local->skb_queue) +
326 skb_queue_len(&local->skb_queue_unreliable);
327 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
328 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
329 dev_kfree_skb_irq(skb);
331 I802_DEBUG_INC(local->tx_status_drop);
333 tasklet_schedule(&local->tasklet);
335 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
337 static void ieee80211_tasklet_handler(unsigned long data)
339 struct ieee80211_local *local = (struct ieee80211_local *) data;
341 struct ieee80211_rx_status rx_status;
342 struct ieee80211_ra_tid *ra_tid;
344 while ((skb = skb_dequeue(&local->skb_queue)) ||
345 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
346 switch (skb->pkt_type) {
347 case IEEE80211_RX_MSG:
348 /* status is in skb->cb */
349 memcpy(&rx_status, skb->cb, sizeof(rx_status));
350 /* Clear skb->pkt_type in order to not confuse kernel
353 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
355 case IEEE80211_TX_STATUS_MSG:
357 ieee80211_tx_status(local_to_hw(local), skb);
359 case IEEE80211_DELBA_MSG:
360 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
361 ieee80211_stop_tx_ba_cb(local_to_hw(local),
362 ra_tid->ra, ra_tid->tid);
365 case IEEE80211_ADDBA_MSG:
366 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
367 ieee80211_start_tx_ba_cb(local_to_hw(local),
368 ra_tid->ra, ra_tid->tid);
372 WARN(1, "mac80211: Packet is of unknown type %d\n",
380 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
381 * make a prepared TX frame (one that has been given to hw) to look like brand
382 * new IEEE 802.11 frame that is ready to go through TX processing again.
384 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
385 struct ieee80211_key *key,
388 unsigned int hdrlen, iv_len, mic_len;
389 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
391 hdrlen = ieee80211_hdrlen(hdr->frame_control);
396 switch (key->conf.alg) {
399 mic_len = WEP_ICV_LEN;
402 iv_len = TKIP_IV_LEN;
403 mic_len = TKIP_ICV_LEN;
406 iv_len = CCMP_HDR_LEN;
407 mic_len = CCMP_MIC_LEN;
413 if (skb->len >= hdrlen + mic_len &&
414 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
415 skb_trim(skb, skb->len - mic_len);
416 if (skb->len >= hdrlen + iv_len) {
417 memmove(skb->data + iv_len, skb->data, hdrlen);
418 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
422 if (ieee80211_is_data_qos(hdr->frame_control)) {
423 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
424 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
425 hdrlen - IEEE80211_QOS_CTL_LEN);
426 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
430 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
431 struct sta_info *sta,
434 sta->tx_filtered_count++;
437 * Clear the TX filter mask for this STA when sending the next
438 * packet. If the STA went to power save mode, this will happen
439 * when it wakes up for the next time.
441 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
444 * This code races in the following way:
446 * (1) STA sends frame indicating it will go to sleep and does so
447 * (2) hardware/firmware adds STA to filter list, passes frame up
448 * (3) hardware/firmware processes TX fifo and suppresses a frame
449 * (4) we get TX status before having processed the frame and
450 * knowing that the STA has gone to sleep.
452 * This is actually quite unlikely even when both those events are
453 * processed from interrupts coming in quickly after one another or
454 * even at the same time because we queue both TX status events and
455 * RX frames to be processed by a tasklet and process them in the
456 * same order that they were received or TX status last. Hence, there
457 * is no race as long as the frame RX is processed before the next TX
458 * status, which drivers can ensure, see below.
460 * Note that this can only happen if the hardware or firmware can
461 * actually add STAs to the filter list, if this is done by the
462 * driver in response to set_tim() (which will only reduce the race
463 * this whole filtering tries to solve, not completely solve it)
464 * this situation cannot happen.
466 * To completely solve this race drivers need to make sure that they
467 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
469 * (b) always process RX events before TX status events if ordering
470 * can be unknown, for example with different interrupt status
473 if (test_sta_flags(sta, WLAN_STA_PS) &&
474 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
475 ieee80211_remove_tx_extra(local, sta->key, skb);
476 skb_queue_tail(&sta->tx_filtered, skb);
480 if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
481 /* Software retry the packet once */
483 ieee80211_remove_tx_extra(local, sta->key, skb);
488 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
490 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
491 "queue_len=%d PS=%d @%lu\n",
492 wiphy_name(local->hw.wiphy),
493 skb_queue_len(&sta->tx_filtered),
494 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
499 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
501 struct sk_buff *skb2;
502 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
503 struct ieee80211_local *local = hw_to_local(hw);
504 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
507 struct ieee80211_supported_band *sband;
508 struct ieee80211_tx_status_rtap_hdr *rthdr;
509 struct ieee80211_sub_if_data *sdata;
510 struct net_device *prev_dev = NULL;
511 struct sta_info *sta;
512 int retry_count = -1, i;
514 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
515 /* the HW cannot have attempted that rate */
516 if (i >= hw->max_rates) {
517 info->status.rates[i].idx = -1;
518 info->status.rates[i].count = 0;
521 retry_count += info->status.rates[i].count;
528 sband = local->hw.wiphy->bands[info->band];
530 sta = sta_info_get(local, hdr->addr1);
533 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
534 test_sta_flags(sta, WLAN_STA_PS)) {
536 * The STA is in power save mode, so assume
537 * that this TX packet failed because of that.
539 ieee80211_handle_filtered_frame(local, sta, skb);
544 fc = hdr->frame_control;
546 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
547 (ieee80211_is_data_qos(fc))) {
551 qc = ieee80211_get_qos_ctl(hdr);
553 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
554 & IEEE80211_SCTL_SEQ);
555 ieee80211_send_bar(sta->sdata, hdr->addr1,
559 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
560 ieee80211_handle_filtered_frame(local, sta, skb);
564 if (!(info->flags & IEEE80211_TX_STAT_ACK))
565 sta->tx_retry_failed++;
566 sta->tx_retry_count += retry_count;
569 rate_control_tx_status(local, sband, sta, skb);
574 ieee80211_led_tx(local, 0);
577 * Fragments are passed to low-level drivers as separate skbs, so these
578 * are actually fragments, not frames. Update frame counters only for
579 * the first fragment of the frame. */
581 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
582 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
584 if (info->flags & IEEE80211_TX_STAT_ACK) {
586 local->dot11TransmittedFrameCount++;
587 if (is_multicast_ether_addr(hdr->addr1))
588 local->dot11MulticastTransmittedFrameCount++;
590 local->dot11RetryCount++;
592 local->dot11MultipleRetryCount++;
595 /* This counter shall be incremented for an acknowledged MPDU
596 * with an individual address in the address 1 field or an MPDU
597 * with a multicast address in the address 1 field of type Data
599 if (!is_multicast_ether_addr(hdr->addr1) ||
600 type == IEEE80211_FTYPE_DATA ||
601 type == IEEE80211_FTYPE_MGMT)
602 local->dot11TransmittedFragmentCount++;
605 local->dot11FailedCount++;
608 /* this was a transmitted frame, but now we want to reuse it */
612 * This is a bit racy but we can avoid a lot of work
615 if (!local->monitors && !local->cooked_mntrs) {
620 /* send frame to monitor interfaces now */
622 if (skb_headroom(skb) < sizeof(*rthdr)) {
623 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
628 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
629 skb_push(skb, sizeof(*rthdr));
631 memset(rthdr, 0, sizeof(*rthdr));
632 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
633 rthdr->hdr.it_present =
634 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
635 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
636 (1 << IEEE80211_RADIOTAP_RATE));
638 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
639 !is_multicast_ether_addr(hdr->addr1))
640 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
643 * XXX: Once radiotap gets the bitmap reset thing the vendor
644 * extensions proposal contains, we can actually report
645 * the whole set of tries we did.
647 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
648 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
649 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
650 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
651 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
652 if (info->status.rates[0].idx >= 0 &&
653 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
654 rthdr->rate = sband->bitrates[
655 info->status.rates[0].idx].bitrate / 5;
657 /* for now report the total retry_count */
658 rthdr->data_retries = retry_count;
660 /* XXX: is this sufficient for BPF? */
661 skb_set_mac_header(skb, 0);
662 skb->ip_summed = CHECKSUM_UNNECESSARY;
663 skb->pkt_type = PACKET_OTHERHOST;
664 skb->protocol = htons(ETH_P_802_2);
665 memset(skb->cb, 0, sizeof(skb->cb));
668 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
669 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
670 if (!netif_running(sdata->dev))
674 skb2 = skb_clone(skb, GFP_ATOMIC);
676 skb2->dev = prev_dev;
681 prev_dev = sdata->dev;
692 EXPORT_SYMBOL(ieee80211_tx_status);
694 static void ieee80211_restart_work(struct work_struct *work)
696 struct ieee80211_local *local =
697 container_of(work, struct ieee80211_local, restart_work);
700 ieee80211_reconfig(local);
704 void ieee80211_restart_hw(struct ieee80211_hw *hw)
706 struct ieee80211_local *local = hw_to_local(hw);
708 /* use this reason, __ieee80211_resume will unblock it */
709 ieee80211_stop_queues_by_reason(hw,
710 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
712 schedule_work(&local->restart_work);
714 EXPORT_SYMBOL(ieee80211_restart_hw);
716 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
717 const struct ieee80211_ops *ops)
719 struct ieee80211_local *local;
723 /* Ensure 32-byte alignment of our private data and hw private data.
724 * We use the wiphy priv data for both our ieee80211_local and for
725 * the driver's private data
727 * In memory it'll be like this:
729 * +-------------------------+
731 * +-------------------------+
732 * | struct ieee80211_local |
733 * +-------------------------+
734 * | driver's private data |
735 * +-------------------------+
738 priv_size = ((sizeof(struct ieee80211_local) +
739 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
742 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
747 wiphy->privid = mac80211_wiphy_privid;
749 /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
750 wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
751 sizeof(struct cfg80211_bss);
753 local = wiphy_priv(wiphy);
755 local->hw.wiphy = wiphy;
757 local->hw.priv = (char *)local +
758 ((sizeof(struct ieee80211_local) +
759 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
764 BUG_ON(!ops->config);
765 BUG_ON(!ops->add_interface);
766 BUG_ON(!ops->remove_interface);
767 BUG_ON(!ops->configure_filter);
770 /* set up some defaults */
771 local->hw.queues = 1;
772 local->hw.max_rates = 1;
773 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
774 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
775 local->hw.conf.radio_enabled = true;
776 local->user_power_level = -1;
778 INIT_LIST_HEAD(&local->interfaces);
779 mutex_init(&local->iflist_mtx);
780 mutex_init(&local->scan_mtx);
782 spin_lock_init(&local->key_lock);
784 spin_lock_init(&local->queue_stop_reason_lock);
786 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
788 INIT_WORK(&local->restart_work, ieee80211_restart_work);
790 INIT_WORK(&local->dynamic_ps_enable_work,
791 ieee80211_dynamic_ps_enable_work);
792 INIT_WORK(&local->dynamic_ps_disable_work,
793 ieee80211_dynamic_ps_disable_work);
794 setup_timer(&local->dynamic_ps_timer,
795 ieee80211_dynamic_ps_timer, (unsigned long) local);
797 sta_info_init(local);
799 for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
800 skb_queue_head_init(&local->pending[i]);
801 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
802 (unsigned long)local);
803 tasklet_disable(&local->tx_pending_tasklet);
805 tasklet_init(&local->tasklet,
806 ieee80211_tasklet_handler,
807 (unsigned long) local);
808 tasklet_disable(&local->tasklet);
810 skb_queue_head_init(&local->skb_queue);
811 skb_queue_head_init(&local->skb_queue_unreliable);
813 spin_lock_init(&local->ampdu_lock);
815 return local_to_hw(local);
817 EXPORT_SYMBOL(ieee80211_alloc_hw);
819 static const struct net_device_ops ieee80211_master_ops = {
820 .ndo_start_xmit = ieee80211_master_start_xmit,
821 .ndo_open = ieee80211_master_open,
822 .ndo_stop = ieee80211_master_stop,
823 .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
824 .ndo_select_queue = ieee80211_select_queue,
827 static void ieee80211_master_setup(struct net_device *mdev)
829 mdev->type = ARPHRD_IEEE80211;
830 mdev->netdev_ops = &ieee80211_master_ops;
831 mdev->header_ops = &ieee80211_header_ops;
832 mdev->tx_queue_len = 1000;
833 mdev->addr_len = ETH_ALEN;
836 int ieee80211_register_hw(struct ieee80211_hw *hw)
838 struct ieee80211_local *local = hw_to_local(hw);
840 enum ieee80211_band band;
841 struct net_device *mdev;
842 struct ieee80211_master_priv *mpriv;
843 int channels, i, j, max_bitrates;
845 static const u32 cipher_suites[] = {
846 WLAN_CIPHER_SUITE_WEP40,
847 WLAN_CIPHER_SUITE_WEP104,
848 WLAN_CIPHER_SUITE_TKIP,
849 WLAN_CIPHER_SUITE_CCMP,
851 /* keep last -- depends on hw flags! */
852 WLAN_CIPHER_SUITE_AES_CMAC
856 * generic code guarantees at least one band,
857 * set this very early because much code assumes
858 * that hw.conf.channel is assigned
863 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
864 struct ieee80211_supported_band *sband;
866 sband = local->hw.wiphy->bands[band];
869 if (!local->oper_channel) {
870 /* init channel we're on */
871 local->hw.conf.channel =
872 local->oper_channel = &sband->channels[0];
873 local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
875 channels += sband->n_channels;
877 if (max_bitrates < sband->n_bitrates)
878 max_bitrates = sband->n_bitrates;
879 supp_ht = supp_ht || sband->ht_cap.ht_supported;
882 local->int_scan_req.n_channels = channels;
883 local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
884 if (!local->int_scan_req.channels)
887 /* if low-level driver supports AP, we also support VLAN */
888 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
889 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
891 /* mac80211 always supports monitor */
892 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
894 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
895 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
896 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
897 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
900 * Calculate scan IE length -- we need this to alloc
901 * memory and to subtract from the driver limit. It
902 * includes the (extended) supported rates and HT
903 * information -- SSID is the driver's responsibility.
905 local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
907 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
909 if (!local->ops->hw_scan) {
910 /* For hw_scan, driver needs to set these up. */
911 local->hw.wiphy->max_scan_ssids = 4;
912 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
916 * If the driver supports any scan IEs, then assume the
917 * limit includes the IEs mac80211 will add, otherwise
918 * leave it at zero and let the driver sort it out; we
919 * still pass our IEs to the driver but userspace will
920 * not be allowed to in that case.
922 if (local->hw.wiphy->max_scan_ie_len)
923 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
925 local->hw.wiphy->cipher_suites = cipher_suites;
926 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
927 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
928 local->hw.wiphy->n_cipher_suites--;
930 result = wiphy_register(local->hw.wiphy);
932 goto fail_wiphy_register;
935 * We use the number of queues for feature tests (QoS, HT) internally
936 * so restrict them appropriately.
938 if (hw->queues > IEEE80211_MAX_QUEUES)
939 hw->queues = IEEE80211_MAX_QUEUES;
941 mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
942 "wmaster%d", ieee80211_master_setup,
945 goto fail_mdev_alloc;
947 mpriv = netdev_priv(mdev);
948 mpriv->local = local;
951 local->hw.workqueue =
952 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
953 if (!local->hw.workqueue) {
959 * The hardware needs headroom for sending the frame,
960 * and we need some headroom for passing the frame to monitor
961 * interfaces, but never both at the same time.
963 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
964 sizeof(struct ieee80211_tx_status_rtap_hdr));
966 debugfs_hw_add(local);
968 if (local->hw.max_listen_interval == 0)
969 local->hw.max_listen_interval = 1;
971 local->hw.conf.listen_interval = local->hw.max_listen_interval;
973 result = sta_info_start(local);
977 result = ieee80211_wep_init(local);
979 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
980 wiphy_name(local->hw.wiphy), result);
985 result = dev_alloc_name(local->mdev, local->mdev->name);
989 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
990 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
991 local->mdev->features |= NETIF_F_NETNS_LOCAL;
993 result = register_netdevice(local->mdev);
997 result = ieee80211_init_rate_ctrl_alg(local,
998 hw->rate_control_algorithm);
1000 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1001 "algorithm\n", wiphy_name(local->hw.wiphy));
1005 /* add one default STA interface if supported */
1006 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1007 result = ieee80211_if_add(local, "wlan%d", NULL,
1008 NL80211_IFTYPE_STATION, NULL);
1010 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1011 wiphy_name(local->hw.wiphy));
1016 ieee80211_led_init(local);
1018 /* alloc internal scan request */
1020 local->int_scan_req.ssids = &local->scan_ssid;
1021 local->int_scan_req.n_ssids = 1;
1022 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1023 if (!hw->wiphy->bands[band])
1025 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1026 local->int_scan_req.channels[i] =
1027 &hw->wiphy->bands[band]->channels[j];
1032 local->network_latency_notifier.notifier_call =
1033 ieee80211_max_network_latency;
1034 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1035 &local->network_latency_notifier);
1045 ieee80211_led_exit(local);
1046 ieee80211_remove_interfaces(local);
1048 unregister_netdevice(local->mdev);
1052 ieee80211_wep_free(local);
1054 sta_info_stop(local);
1056 debugfs_hw_del(local);
1057 destroy_workqueue(local->hw.workqueue);
1060 free_netdev(local->mdev);
1062 wiphy_unregister(local->hw.wiphy);
1063 fail_wiphy_register:
1064 kfree(local->int_scan_req.channels);
1067 EXPORT_SYMBOL(ieee80211_register_hw);
1069 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1071 struct ieee80211_local *local = hw_to_local(hw);
1073 tasklet_kill(&local->tx_pending_tasklet);
1074 tasklet_kill(&local->tasklet);
1076 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1077 &local->network_latency_notifier);
1082 * At this point, interface list manipulations are fine
1083 * because the driver cannot be handing us frames any
1084 * more and the tasklet is killed.
1087 /* First, we remove all virtual interfaces. */
1088 ieee80211_remove_interfaces(local);
1090 /* then, finally, remove the master interface */
1091 unregister_netdevice(local->mdev);
1095 ieee80211_clear_tx_pending(local);
1096 sta_info_stop(local);
1097 rate_control_deinitialize(local);
1098 debugfs_hw_del(local);
1100 if (skb_queue_len(&local->skb_queue)
1101 || skb_queue_len(&local->skb_queue_unreliable))
1102 printk(KERN_WARNING "%s: skb_queue not empty\n",
1103 wiphy_name(local->hw.wiphy));
1104 skb_queue_purge(&local->skb_queue);
1105 skb_queue_purge(&local->skb_queue_unreliable);
1107 destroy_workqueue(local->hw.workqueue);
1108 wiphy_unregister(local->hw.wiphy);
1109 ieee80211_wep_free(local);
1110 ieee80211_led_exit(local);
1111 free_netdev(local->mdev);
1112 kfree(local->int_scan_req.channels);
1114 EXPORT_SYMBOL(ieee80211_unregister_hw);
1116 void ieee80211_free_hw(struct ieee80211_hw *hw)
1118 struct ieee80211_local *local = hw_to_local(hw);
1120 mutex_destroy(&local->iflist_mtx);
1121 mutex_destroy(&local->scan_mtx);
1123 wiphy_free(local->hw.wiphy);
1125 EXPORT_SYMBOL(ieee80211_free_hw);
1127 static int __init ieee80211_init(void)
1129 struct sk_buff *skb;
1132 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1133 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1134 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1136 ret = rc80211_minstrel_init();
1140 ret = rc80211_pid_init();
1144 ieee80211_debugfs_netdev_init();
1149 static void __exit ieee80211_exit(void)
1152 rc80211_minstrel_exit();
1155 * For key todo, it'll be empty by now but the work
1156 * might still be scheduled.
1158 flush_scheduled_work();
1163 ieee80211_debugfs_netdev_exit();
1167 subsys_initcall(ieee80211_init);
1168 module_exit(ieee80211_exit);
1170 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1171 MODULE_LICENSE("GPL");