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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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skb->pkt_type = IEEE80211_TX_STATUS_MSG;
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skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
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&local->skb_queue : &local->skb_queue_unreliable, skb);
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tmp = skb_queue_len(&local->skb_queue) +
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skb_queue_len(&local->skb_queue_unreliable);
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while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
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(skb = skb_dequeue(&local->skb_queue_unreliable))) {
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dev_kfree_skb_irq(skb);
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I802_DEBUG_INC(local->tx_status_drop);
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tasklet_schedule(&local->tasklet);
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EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
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static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct ieee80211_hdr *hdr = (void *)skb->data;
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* This skb 'survived' a round-trip through the driver, and
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* hopefully the driver didn't mangle it too badly. However,
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* we can definitely not rely on the control information
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* being correct. Clear it so we don't get junk there, and
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* indicate that it needs new processing, but must not be
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* modified/encrypted again.
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memset(&info->control, 0, sizeof(info->control));
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info->control.jiffies = jiffies;
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info->control.vif = &sta->sdata->vif;
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info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
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IEEE80211_TX_INTFL_RETRANSMISSION;
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info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
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sta->tx_filtered_count++;
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* Clear more-data bit on filtered frames, it might be set
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* but later frames might time out so it might have to be
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* clear again ... It's all rather unlikely (this frame
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* should time out first, right?) but let's not confuse
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* peers unnecessarily.
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if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
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hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
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if (ieee80211_is_data_qos(hdr->frame_control)) {
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u8 *p = ieee80211_get_qos_ctl(hdr);
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int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
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* Clear EOSP if set, this could happen e.g.
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* if an absence period (us being a P2P GO)
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if (*p & IEEE80211_QOS_CTL_EOSP)
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*p &= ~IEEE80211_QOS_CTL_EOSP;
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ac = ieee802_1d_to_ac[tid & 7];
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* Clear the TX filter mask for this STA when sending the next
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* packet. If the STA went to power save mode, this will happen
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* when it wakes up for the next time.
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set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
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* This code races in the following way:
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* (1) STA sends frame indicating it will go to sleep and does so
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* (2) hardware/firmware adds STA to filter list, passes frame up
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* (3) hardware/firmware processes TX fifo and suppresses a frame
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* (4) we get TX status before having processed the frame and
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* knowing that the STA has gone to sleep.
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* This is actually quite unlikely even when both those events are
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* processed from interrupts coming in quickly after one another or
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* even at the same time because we queue both TX status events and
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* RX frames to be processed by a tasklet and process them in the
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* same order that they were received or TX status last. Hence, there
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* is no race as long as the frame RX is processed before the next TX
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* status, which drivers can ensure, see below.
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* Note that this can only happen if the hardware or firmware can
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* actually add STAs to the filter list, if this is done by the
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* driver in response to set_tim() (which will only reduce the race
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* this whole filtering tries to solve, not completely solve it)
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* this situation cannot happen.
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* To completely solve this race drivers need to make sure that they
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* (a) don't mix the irq-safe/not irq-safe TX status/RX processing
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* (b) always process RX events before TX status events if ordering
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* can be unknown, for example with different interrupt status
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* (c) if PS mode transitions are manual (i.e. the flag
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* %IEEE80211_HW_AP_LINK_PS is set), always process PS state
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* changes before calling TX status events if ordering can be
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if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
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skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
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skb_queue_tail(&sta->tx_filtered[ac], skb);
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sta_info_recalc_tim(sta);
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if (!timer_pending(&local->sta_cleanup))
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mod_timer(&local->sta_cleanup,
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round_jiffies(jiffies +
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STA_INFO_CLEANUP_INTERVAL));
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if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
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!(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
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/* Software retry the packet once */
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info->flags |= IEEE80211_TX_INTFL_RETRIED;
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ieee80211_add_pending_skb(local, skb);
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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wiphy_debug(local->hw.wiphy,
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"dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
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skb_queue_len(&sta->tx_filtered[ac]),
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!!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
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static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
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struct tid_ampdu_tx *tid_tx;
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tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
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if (!tid_tx || !tid_tx->bar_pending)
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tid_tx->bar_pending = false;
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ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
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static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
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struct ieee80211_mgmt *mgmt = (void *) skb->data;
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struct ieee80211_local *local = sta->local;
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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if (ieee80211_is_data_qos(mgmt->frame_control)) {
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struct ieee80211_hdr *hdr = (void *) skb->data;
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u8 *qc = ieee80211_get_qos_ctl(hdr);
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u16 tid = qc[0] & 0xf;
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ieee80211_check_pending_bar(sta, hdr->addr1, tid);
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if (ieee80211_is_action(mgmt->frame_control) &&
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sdata->vif.type == NL80211_IFTYPE_STATION &&
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mgmt->u.action.category == WLAN_CATEGORY_HT &&
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mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
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* This update looks racy, but isn't -- if we come
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* here we've definitely got a station that we're
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* talking to, and on a managed interface that can
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* only be the AP. And the only other place updating
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* this variable is before we're associated.
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switch (mgmt->u.action.u.ht_smps.smps_control) {
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case WLAN_HT_SMPS_CONTROL_DYNAMIC:
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sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
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case WLAN_HT_SMPS_CONTROL_STATIC:
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sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
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case WLAN_HT_SMPS_CONTROL_DISABLED:
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default: /* shouldn't happen since we don't send that */
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sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
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ieee80211_queue_work(&local->hw, &local->recalc_smps);
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static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
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struct tid_ampdu_tx *tid_tx;
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tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
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tid_tx->failed_bar_ssn = ssn;
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tid_tx->bar_pending = true;
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static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
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int len = sizeof(struct ieee80211_radiotap_header);
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/* IEEE80211_RADIOTAP_RATE rate */
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if (info->status.rates[0].idx >= 0 &&
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!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
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/* IEEE80211_RADIOTAP_TX_FLAGS */
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/* IEEE80211_RADIOTAP_DATA_RETRIES */
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/* IEEE80211_TX_RC_MCS */
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if (info->status.rates[0].idx >= 0 &&
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info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
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static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band
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*sband, struct sk_buff *skb,
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int retry_count, int rtap_len)
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_radiotap_header *rthdr;
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rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
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memset(rthdr, 0, rtap_len);
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rthdr->it_len = cpu_to_le16(rtap_len);
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cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
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(1 << IEEE80211_RADIOTAP_DATA_RETRIES));
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pos = (unsigned char *)(rthdr + 1);
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* XXX: Once radiotap gets the bitmap reset thing the vendor
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* extensions proposal contains, we can actually report
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* the whole set of tries we did.
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/* IEEE80211_RADIOTAP_RATE */
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if (info->status.rates[0].idx >= 0 &&
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!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
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rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
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*pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5;
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/* padding for tx flags */
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/* IEEE80211_RADIOTAP_TX_FLAGS */
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if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
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!is_multicast_ether_addr(hdr->addr1))
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txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
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if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
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(info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
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txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
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else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
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txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
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put_unaligned_le16(txflags, pos);
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/* IEEE80211_RADIOTAP_DATA_RETRIES */
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/* for now report the total retry_count */
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/* IEEE80211_TX_RC_MCS */
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if (info->status.rates[0].idx >= 0 &&
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info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
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rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
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pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
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IEEE80211_RADIOTAP_MCS_HAVE_GI |
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IEEE80211_RADIOTAP_MCS_HAVE_BW;
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if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
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pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
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if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
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pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
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if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
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pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
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pos[2] = info->status.rates[0].idx;
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* Use a static threshold for now, best value to be determined
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* Should it depend on:
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* - on # of retransmissions
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* - current throughput (higher value for higher tpt)?
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#define STA_LOST_PKT_THRESHOLD 50
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void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
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struct sk_buff *skb2;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct ieee80211_supported_band *sband;
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struct ieee80211_sub_if_data *sdata;
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struct net_device *prev_dev = NULL;
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struct sta_info *sta, *tmp;
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int retry_count = -1, i;
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struct ieee80211_bar *bar;
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for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
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if (info->status.rates[i].idx < 0) {
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} else if (i >= hw->max_report_rates) {
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/* the HW cannot have attempted that rate */
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info->status.rates[i].idx = -1;
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info->status.rates[i].count = 0;
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retry_count += info->status.rates[i].count;
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sband = local->hw.wiphy->bands[info->band];
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fc = hdr->frame_control;
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for_each_sta_info(local, hdr->addr1, sta, tmp) {
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/* skip wrong virtual interface */
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if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
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if (info->flags & IEEE80211_TX_STATUS_EOSP)
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clear_sta_flag(sta, WLAN_STA_SP);
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acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
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if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
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* The STA is in power save mode, so assume
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* that this TX packet failed because of that.
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ieee80211_handle_filtered_frame(local, sta, skb);
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if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
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sta->last_tx_rate = info->status.rates[rates_idx];
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if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
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(ieee80211_is_data_qos(fc))) {
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qc = ieee80211_get_qos_ctl(hdr);
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ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
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& IEEE80211_SCTL_SEQ);
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ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
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if (!acked && ieee80211_is_back_req(fc)) {
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* BAR failed, store the last SSN and retry sending
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* the BAR when the next unicast transmission on the
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bar = (struct ieee80211_bar *) skb->data;
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control = le16_to_cpu(bar->control);
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if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
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u16 ssn = le16_to_cpu(bar->start_seq_num);
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IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
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IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
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ieee80211_set_bar_pending(sta, tid, ssn);
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if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
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ieee80211_handle_filtered_frame(local, sta, skb);
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sta->tx_retry_failed++;
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sta->tx_retry_count += retry_count;
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rate_control_tx_status(local, sband, sta, skb);
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if (ieee80211_vif_is_mesh(&sta->sdata->vif))
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ieee80211s_update_metric(local, sta, skb);
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if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
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ieee80211_frame_acked(sta, skb);
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if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
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(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
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ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
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if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
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if (info->flags & IEEE80211_TX_STAT_ACK) {
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if (sta->lost_packets)
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sta->lost_packets = 0;
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} else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
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cfg80211_cqm_pktloss_notify(sta->sdata->dev,
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sta->lost_packets = 0;
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ieee80211_led_tx(local, 0);
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* Fragments are passed to low-level drivers as separate skbs, so these
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* are actually fragments, not frames. Update frame counters only for
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* the first fragment of the frame. */
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frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
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type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
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if (info->flags & IEEE80211_TX_STAT_ACK) {
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local->dot11TransmittedFrameCount++;
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if (is_multicast_ether_addr(hdr->addr1))
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local->dot11MulticastTransmittedFrameCount++;
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local->dot11RetryCount++;
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local->dot11MultipleRetryCount++;
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/* This counter shall be incremented for an acknowledged MPDU
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* with an individual address in the address 1 field or an MPDU
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* with a multicast address in the address 1 field of type Data
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if (!is_multicast_ether_addr(hdr->addr1) ||
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type == IEEE80211_FTYPE_DATA ||
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type == IEEE80211_FTYPE_MGMT)
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local->dot11TransmittedFragmentCount++;
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local->dot11FailedCount++;
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if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
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(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
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!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
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local->ps_sdata && !(local->scanning)) {
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if (info->flags & IEEE80211_TX_STAT_ACK) {
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local->ps_sdata->u.mgd.flags |=
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IEEE80211_STA_NULLFUNC_ACKED;
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mod_timer(&local->dynamic_ps_timer, jiffies +
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msecs_to_jiffies(10));
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if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
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struct ieee80211_work *wk;
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u64 cookie = (unsigned long)skb;
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list_for_each_entry_rcu(wk, &local->work_list, list) {
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if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX)
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if (wk->offchan_tx.frame != skb)
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wk->offchan_tx.status = true;
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if (local->hw_roc_skb_for_status == skb) {
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cookie = local->hw_roc_cookie ^ 2;
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local->hw_roc_skb_for_status = NULL;
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cfg80211_mgmt_tx_status(
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skb->dev, cookie, skb->data, skb->len,
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!!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
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/* this was a transmitted frame, but now we want to reuse it */
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/* Need to make a copy before skb->cb gets cleared */
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send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
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(type != IEEE80211_FTYPE_DATA);
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* This is a bit racy but we can avoid a lot of work
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if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
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/* send frame to monitor interfaces now */
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rtap_len = ieee80211_tx_radiotap_len(info);
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if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
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printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
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ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len);
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/* XXX: is this sufficient for BPF? */
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skb_set_mac_header(skb, 0);
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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skb->pkt_type = PACKET_OTHERHOST;
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skb->protocol = htons(ETH_P_802_2);
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memset(skb->cb, 0, sizeof(skb->cb));
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
578
if (!ieee80211_sdata_running(sdata))
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if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
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skb2 = skb_clone(skb, GFP_ATOMIC);
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skb2->dev = prev_dev;
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prev_dev = sdata->dev;
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EXPORT_SYMBOL(ieee80211_tx_status);
606
void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
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struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
609
cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
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num_packets, GFP_ATOMIC);
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EXPORT_SYMBOL(ieee80211_report_low_ack);