mac80211: move TX status handling
authorJohannes Berg <johannes@sipsolutions.net>
Wed, 18 Nov 2009 17:42:47 +0000 (18:42 +0100)
committerJohn W. Linville <linville@tuxdriver.com>
Wed, 18 Nov 2009 22:09:27 +0000 (17:09 -0500)
It's enough code to have its own file, I think.
Especially since I'm going to add to it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
net/mac80211/Makefile
net/mac80211/ieee80211_i.h
net/mac80211/main.c
net/mac80211/status.c [new file with mode: 0644]

index 9f3cf71293249610f0dba5f53c673ac7659a578c..298cfcc1bf8d205c78ff826116655652af8247ae 100644 (file)
@@ -2,7 +2,7 @@ obj-$(CONFIG_MAC80211) += mac80211.o
 
 # mac80211 objects
 mac80211-y := \
-       main.o \
+       main.o status.o \
        sta_info.o \
        wep.o \
        wpa.o \
index 598db7cbeb44290d6add207db1ec7788c1a2f5c4..74e79935de0a8a4084bcca37a41b43676823e485 100644 (file)
@@ -23,6 +23,7 @@
 #include <linux/types.h>
 #include <linux/spinlock.h>
 #include <linux/etherdevice.h>
+#include <net/ieee80211_radiotap.h>
 #include <net/cfg80211.h>
 #include <net/mac80211.h>
 #include "key.h"
@@ -948,6 +949,18 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
                                       struct net_device *dev);
 
+/*
+ * radiotap header for status frames
+ */
+struct ieee80211_tx_status_rtap_hdr {
+       struct ieee80211_radiotap_header hdr;
+       u8 rate;
+       u8 padding_for_rate;
+       __le16 tx_flags;
+       u8 data_retries;
+} __attribute__ ((packed));
+
+
 /* HT */
 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
                                       struct ieee80211_ht_cap *ht_cap_ie,
index f4be97c3b7473e457791ef8fbc01520702a2fcf2..e843a912849cc6207a4fef1326c9d9543eff7002 100644 (file)
@@ -9,7 +9,6 @@
  */
 
 #include <net/mac80211.h>
-#include <net/ieee80211_radiotap.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
 #include "rate.h"
 #include "mesh.h"
 #include "wep.h"
-#include "wme.h"
-#include "aes_ccm.h"
 #include "led.h"
 #include "cfg.h"
 #include "debugfs.h"
 #include "debugfs_netdev.h"
 
-/*
- * For seeing transmitted packets on monitor interfaces
- * we have a radiotap header too.
- */
-struct ieee80211_tx_status_rtap_hdr {
-       struct ieee80211_radiotap_header hdr;
-       u8 rate;
-       u8 padding_for_rate;
-       __le16 tx_flags;
-       u8 data_retries;
-} __attribute__ ((packed));
-
-
 void ieee80211_configure_filter(struct ieee80211_local *local)
 {
        u64 mc;
@@ -253,28 +237,6 @@ u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
               BSS_CHANGED_ERP_SLOT;
 }
 
-void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
-                                struct sk_buff *skb)
-{
-       struct ieee80211_local *local = hw_to_local(hw);
-       struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-       int tmp;
-
-       skb->pkt_type = IEEE80211_TX_STATUS_MSG;
-       skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
-                      &local->skb_queue : &local->skb_queue_unreliable, skb);
-       tmp = skb_queue_len(&local->skb_queue) +
-               skb_queue_len(&local->skb_queue_unreliable);
-       while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
-              (skb = skb_dequeue(&local->skb_queue_unreliable))) {
-               dev_kfree_skb_irq(skb);
-               tmp--;
-               I802_DEBUG_INC(local->tx_status_drop);
-       }
-       tasklet_schedule(&local->tasklet);
-}
-EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
-
 static void ieee80211_tasklet_handler(unsigned long data)
 {
        struct ieee80211_local *local = (struct ieee80211_local *) data;
@@ -315,304 +277,6 @@ static void ieee80211_tasklet_handler(unsigned long data)
        }
 }
 
-static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
-                                           struct sta_info *sta,
-                                           struct sk_buff *skb)
-{
-       struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-
-       /*
-        * XXX: This is temporary!
-        *
-        *      The problem here is that when we get here, the driver will
-        *      quite likely have pretty much overwritten info->control by
-        *      using info->driver_data or info->rate_driver_data. Thus,
-        *      when passing out the frame to the driver again, we would be
-        *      passing completely bogus data since the driver would then
-        *      expect a properly filled info->control. In mac80211 itself
-        *      the same problem occurs, since we need info->control.vif
-        *      internally.
-        *
-        *      To fix this, we should send the frame through TX processing
-        *      again. However, it's not that simple, since the frame will
-        *      have been software-encrypted (if applicable) already, and
-        *      encrypting it again doesn't do much good. So to properly do
-        *      that, we not only have to skip the actual 'raw' encryption
-        *      (key selection etc. still has to be done!) but also the
-        *      sequence number assignment since that impacts the crypto
-        *      encapsulation, of course.
-        *
-        *      Hence, for now, fix the bug by just dropping the frame.
-        */
-       goto drop;
-
-       sta->tx_filtered_count++;
-
-       /*
-        * Clear the TX filter mask for this STA when sending the next
-        * packet. If the STA went to power save mode, this will happen
-        * when it wakes up for the next time.
-        */
-       set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
-
-       /*
-        * This code races in the following way:
-        *
-        *  (1) STA sends frame indicating it will go to sleep and does so
-        *  (2) hardware/firmware adds STA to filter list, passes frame up
-        *  (3) hardware/firmware processes TX fifo and suppresses a frame
-        *  (4) we get TX status before having processed the frame and
-        *      knowing that the STA has gone to sleep.
-        *
-        * This is actually quite unlikely even when both those events are
-        * processed from interrupts coming in quickly after one another or
-        * even at the same time because we queue both TX status events and
-        * RX frames to be processed by a tasklet and process them in the
-        * same order that they were received or TX status last. Hence, there
-        * is no race as long as the frame RX is processed before the next TX
-        * status, which drivers can ensure, see below.
-        *
-        * Note that this can only happen if the hardware or firmware can
-        * actually add STAs to the filter list, if this is done by the
-        * driver in response to set_tim() (which will only reduce the race
-        * this whole filtering tries to solve, not completely solve it)
-        * this situation cannot happen.
-        *
-        * To completely solve this race drivers need to make sure that they
-        *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
-        *      functions and
-        *  (b) always process RX events before TX status events if ordering
-        *      can be unknown, for example with different interrupt status
-        *      bits.
-        */
-       if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
-           skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
-               skb_queue_tail(&sta->tx_filtered, skb);
-               return;
-       }
-
-       if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
-           !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
-               /* Software retry the packet once */
-               info->flags |= IEEE80211_TX_INTFL_RETRIED;
-               ieee80211_add_pending_skb(local, skb);
-               return;
-       }
-
- drop:
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-       if (net_ratelimit())
-               printk(KERN_DEBUG "%s: dropped TX filtered frame, "
-                      "queue_len=%d PS=%d @%lu\n",
-                      wiphy_name(local->hw.wiphy),
-                      skb_queue_len(&sta->tx_filtered),
-                      !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
-#endif
-       dev_kfree_skb(skb);
-}
-
-void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
-{
-       struct sk_buff *skb2;
-       struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-       struct ieee80211_local *local = hw_to_local(hw);
-       struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-       u16 frag, type;
-       __le16 fc;
-       struct ieee80211_supported_band *sband;
-       struct ieee80211_tx_status_rtap_hdr *rthdr;
-       struct ieee80211_sub_if_data *sdata;
-       struct net_device *prev_dev = NULL;
-       struct sta_info *sta;
-       int retry_count = -1, i;
-
-       for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
-               /* the HW cannot have attempted that rate */
-               if (i >= hw->max_rates) {
-                       info->status.rates[i].idx = -1;
-                       info->status.rates[i].count = 0;
-               }
-
-               retry_count += info->status.rates[i].count;
-       }
-       if (retry_count < 0)
-               retry_count = 0;
-
-       rcu_read_lock();
-
-       sband = local->hw.wiphy->bands[info->band];
-
-       sta = sta_info_get(local, hdr->addr1);
-
-       if (sta) {
-               if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
-                   test_sta_flags(sta, WLAN_STA_PS_STA)) {
-                       /*
-                        * The STA is in power save mode, so assume
-                        * that this TX packet failed because of that.
-                        */
-                       ieee80211_handle_filtered_frame(local, sta, skb);
-                       rcu_read_unlock();
-                       return;
-               }
-
-               fc = hdr->frame_control;
-
-               if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
-                   (ieee80211_is_data_qos(fc))) {
-                       u16 tid, ssn;
-                       u8 *qc;
-
-                       qc = ieee80211_get_qos_ctl(hdr);
-                       tid = qc[0] & 0xf;
-                       ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
-                                               & IEEE80211_SCTL_SEQ);
-                       ieee80211_send_bar(sta->sdata, hdr->addr1,
-                                          tid, ssn);
-               }
-
-               if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
-                       ieee80211_handle_filtered_frame(local, sta, skb);
-                       rcu_read_unlock();
-                       return;
-               } else {
-                       if (!(info->flags & IEEE80211_TX_STAT_ACK))
-                               sta->tx_retry_failed++;
-                       sta->tx_retry_count += retry_count;
-               }
-
-               rate_control_tx_status(local, sband, sta, skb);
-               if (ieee80211_vif_is_mesh(&sta->sdata->vif))
-                       ieee80211s_update_metric(local, sta, skb);
-       }
-
-       rcu_read_unlock();
-
-       ieee80211_led_tx(local, 0);
-
-       /* SNMP counters
-        * Fragments are passed to low-level drivers as separate skbs, so these
-        * are actually fragments, not frames. Update frame counters only for
-        * the first fragment of the frame. */
-
-       frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
-       type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
-
-       if (info->flags & IEEE80211_TX_STAT_ACK) {
-               if (frag == 0) {
-                       local->dot11TransmittedFrameCount++;
-                       if (is_multicast_ether_addr(hdr->addr1))
-                               local->dot11MulticastTransmittedFrameCount++;
-                       if (retry_count > 0)
-                               local->dot11RetryCount++;
-                       if (retry_count > 1)
-                               local->dot11MultipleRetryCount++;
-               }
-
-               /* This counter shall be incremented for an acknowledged MPDU
-                * with an individual address in the address 1 field or an MPDU
-                * with a multicast address in the address 1 field of type Data
-                * or Management. */
-               if (!is_multicast_ether_addr(hdr->addr1) ||
-                   type == IEEE80211_FTYPE_DATA ||
-                   type == IEEE80211_FTYPE_MGMT)
-                       local->dot11TransmittedFragmentCount++;
-       } else {
-               if (frag == 0)
-                       local->dot11FailedCount++;
-       }
-
-       /* this was a transmitted frame, but now we want to reuse it */
-       skb_orphan(skb);
-
-       /*
-        * This is a bit racy but we can avoid a lot of work
-        * with this test...
-        */
-       if (!local->monitors && !local->cooked_mntrs) {
-               dev_kfree_skb(skb);
-               return;
-       }
-
-       /* send frame to monitor interfaces now */
-
-       if (skb_headroom(skb) < sizeof(*rthdr)) {
-               printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
-               dev_kfree_skb(skb);
-               return;
-       }
-
-       rthdr = (struct ieee80211_tx_status_rtap_hdr *)
-                               skb_push(skb, sizeof(*rthdr));
-
-       memset(rthdr, 0, sizeof(*rthdr));
-       rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
-       rthdr->hdr.it_present =
-               cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
-                           (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
-                           (1 << IEEE80211_RADIOTAP_RATE));
-
-       if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
-           !is_multicast_ether_addr(hdr->addr1))
-               rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
-
-       /*
-        * XXX: Once radiotap gets the bitmap reset thing the vendor
-        *      extensions proposal contains, we can actually report
-        *      the whole set of tries we did.
-        */
-       if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
-           (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
-               rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
-       else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
-               rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
-       if (info->status.rates[0].idx >= 0 &&
-           !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
-               rthdr->rate = sband->bitrates[
-                               info->status.rates[0].idx].bitrate / 5;
-
-       /* for now report the total retry_count */
-       rthdr->data_retries = retry_count;
-
-       /* XXX: is this sufficient for BPF? */
-       skb_set_mac_header(skb, 0);
-       skb->ip_summed = CHECKSUM_UNNECESSARY;
-       skb->pkt_type = PACKET_OTHERHOST;
-       skb->protocol = htons(ETH_P_802_2);
-       memset(skb->cb, 0, sizeof(skb->cb));
-
-       rcu_read_lock();
-       list_for_each_entry_rcu(sdata, &local->interfaces, list) {
-               if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
-                       if (!netif_running(sdata->dev))
-                               continue;
-
-                       if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
-                           !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
-                           (type == IEEE80211_FTYPE_DATA))
-                               continue;
-
-                       if (prev_dev) {
-                               skb2 = skb_clone(skb, GFP_ATOMIC);
-                               if (skb2) {
-                                       skb2->dev = prev_dev;
-                                       netif_rx(skb2);
-                               }
-                       }
-
-                       prev_dev = sdata->dev;
-               }
-       }
-       if (prev_dev) {
-               skb->dev = prev_dev;
-               netif_rx(skb);
-               skb = NULL;
-       }
-       rcu_read_unlock();
-       dev_kfree_skb(skb);
-}
-EXPORT_SYMBOL(ieee80211_tx_status);
-
 static void ieee80211_restart_work(struct work_struct *work)
 {
        struct ieee80211_local *local =
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
new file mode 100644 (file)
index 0000000..9f91fd8
--- /dev/null
@@ -0,0 +1,337 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
+ * Copyright 2008-2009 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "rate.h"
+#include "mesh.h"
+#include "led.h"
+
+
+void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
+                                struct sk_buff *skb)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+       struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+       int tmp;
+
+       skb->pkt_type = IEEE80211_TX_STATUS_MSG;
+       skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
+                      &local->skb_queue : &local->skb_queue_unreliable, skb);
+       tmp = skb_queue_len(&local->skb_queue) +
+               skb_queue_len(&local->skb_queue_unreliable);
+       while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
+              (skb = skb_dequeue(&local->skb_queue_unreliable))) {
+               dev_kfree_skb_irq(skb);
+               tmp--;
+               I802_DEBUG_INC(local->tx_status_drop);
+       }
+       tasklet_schedule(&local->tasklet);
+}
+EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
+
+static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
+                                           struct sta_info *sta,
+                                           struct sk_buff *skb)
+{
+       struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+
+       /*
+        * XXX: This is temporary!
+        *
+        *      The problem here is that when we get here, the driver will
+        *      quite likely have pretty much overwritten info->control by
+        *      using info->driver_data or info->rate_driver_data. Thus,
+        *      when passing out the frame to the driver again, we would be
+        *      passing completely bogus data since the driver would then
+        *      expect a properly filled info->control. In mac80211 itself
+        *      the same problem occurs, since we need info->control.vif
+        *      internally.
+        *
+        *      To fix this, we should send the frame through TX processing
+        *      again. However, it's not that simple, since the frame will
+        *      have been software-encrypted (if applicable) already, and
+        *      encrypting it again doesn't do much good. So to properly do
+        *      that, we not only have to skip the actual 'raw' encryption
+        *      (key selection etc. still has to be done!) but also the
+        *      sequence number assignment since that impacts the crypto
+        *      encapsulation, of course.
+        *
+        *      Hence, for now, fix the bug by just dropping the frame.
+        */
+       goto drop;
+
+       sta->tx_filtered_count++;
+
+       /*
+        * Clear the TX filter mask for this STA when sending the next
+        * packet. If the STA went to power save mode, this will happen
+        * when it wakes up for the next time.
+        */
+       set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
+
+       /*
+        * This code races in the following way:
+        *
+        *  (1) STA sends frame indicating it will go to sleep and does so
+        *  (2) hardware/firmware adds STA to filter list, passes frame up
+        *  (3) hardware/firmware processes TX fifo and suppresses a frame
+        *  (4) we get TX status before having processed the frame and
+        *      knowing that the STA has gone to sleep.
+        *
+        * This is actually quite unlikely even when both those events are
+        * processed from interrupts coming in quickly after one another or
+        * even at the same time because we queue both TX status events and
+        * RX frames to be processed by a tasklet and process them in the
+        * same order that they were received or TX status last. Hence, there
+        * is no race as long as the frame RX is processed before the next TX
+        * status, which drivers can ensure, see below.
+        *
+        * Note that this can only happen if the hardware or firmware can
+        * actually add STAs to the filter list, if this is done by the
+        * driver in response to set_tim() (which will only reduce the race
+        * this whole filtering tries to solve, not completely solve it)
+        * this situation cannot happen.
+        *
+        * To completely solve this race drivers need to make sure that they
+        *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
+        *      functions and
+        *  (b) always process RX events before TX status events if ordering
+        *      can be unknown, for example with different interrupt status
+        *      bits.
+        */
+       if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
+           skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
+               skb_queue_tail(&sta->tx_filtered, skb);
+               return;
+       }
+
+       if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
+           !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
+               /* Software retry the packet once */
+               info->flags |= IEEE80211_TX_INTFL_RETRIED;
+               ieee80211_add_pending_skb(local, skb);
+               return;
+       }
+
+ drop:
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+       if (net_ratelimit())
+               printk(KERN_DEBUG "%s: dropped TX filtered frame, "
+                      "queue_len=%d PS=%d @%lu\n",
+                      wiphy_name(local->hw.wiphy),
+                      skb_queue_len(&sta->tx_filtered),
+                      !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
+#endif
+       dev_kfree_skb(skb);
+}
+
+void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+       struct sk_buff *skb2;
+       struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+       struct ieee80211_local *local = hw_to_local(hw);
+       struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+       u16 frag, type;
+       __le16 fc;
+       struct ieee80211_supported_band *sband;
+       struct ieee80211_tx_status_rtap_hdr *rthdr;
+       struct ieee80211_sub_if_data *sdata;
+       struct net_device *prev_dev = NULL;
+       struct sta_info *sta;
+       int retry_count = -1, i;
+
+       for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
+               /* the HW cannot have attempted that rate */
+               if (i >= hw->max_rates) {
+                       info->status.rates[i].idx = -1;
+                       info->status.rates[i].count = 0;
+               }
+
+               retry_count += info->status.rates[i].count;
+       }
+       if (retry_count < 0)
+               retry_count = 0;
+
+       rcu_read_lock();
+
+       sband = local->hw.wiphy->bands[info->band];
+
+       sta = sta_info_get(local, hdr->addr1);
+
+       if (sta) {
+               if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
+                   test_sta_flags(sta, WLAN_STA_PS_STA)) {
+                       /*
+                        * The STA is in power save mode, so assume
+                        * that this TX packet failed because of that.
+                        */
+                       ieee80211_handle_filtered_frame(local, sta, skb);
+                       rcu_read_unlock();
+                       return;
+               }
+
+               fc = hdr->frame_control;
+
+               if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
+                   (ieee80211_is_data_qos(fc))) {
+                       u16 tid, ssn;
+                       u8 *qc;
+
+                       qc = ieee80211_get_qos_ctl(hdr);
+                       tid = qc[0] & 0xf;
+                       ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
+                                               & IEEE80211_SCTL_SEQ);
+                       ieee80211_send_bar(sta->sdata, hdr->addr1,
+                                          tid, ssn);
+               }
+
+               if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
+                       ieee80211_handle_filtered_frame(local, sta, skb);
+                       rcu_read_unlock();
+                       return;
+               } else {
+                       if (!(info->flags & IEEE80211_TX_STAT_ACK))
+                               sta->tx_retry_failed++;
+                       sta->tx_retry_count += retry_count;
+               }
+
+               rate_control_tx_status(local, sband, sta, skb);
+               if (ieee80211_vif_is_mesh(&sta->sdata->vif))
+                       ieee80211s_update_metric(local, sta, skb);
+       }
+
+       rcu_read_unlock();
+
+       ieee80211_led_tx(local, 0);
+
+       /* SNMP counters
+        * Fragments are passed to low-level drivers as separate skbs, so these
+        * are actually fragments, not frames. Update frame counters only for
+        * the first fragment of the frame. */
+
+       frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
+       type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
+
+       if (info->flags & IEEE80211_TX_STAT_ACK) {
+               if (frag == 0) {
+                       local->dot11TransmittedFrameCount++;
+                       if (is_multicast_ether_addr(hdr->addr1))
+                               local->dot11MulticastTransmittedFrameCount++;
+                       if (retry_count > 0)
+                               local->dot11RetryCount++;
+                       if (retry_count > 1)
+                               local->dot11MultipleRetryCount++;
+               }
+
+               /* This counter shall be incremented for an acknowledged MPDU
+                * with an individual address in the address 1 field or an MPDU
+                * with a multicast address in the address 1 field of type Data
+                * or Management. */
+               if (!is_multicast_ether_addr(hdr->addr1) ||
+                   type == IEEE80211_FTYPE_DATA ||
+                   type == IEEE80211_FTYPE_MGMT)
+                       local->dot11TransmittedFragmentCount++;
+       } else {
+               if (frag == 0)
+                       local->dot11FailedCount++;
+       }
+
+       /* this was a transmitted frame, but now we want to reuse it */
+       skb_orphan(skb);
+
+       /*
+        * This is a bit racy but we can avoid a lot of work
+        * with this test...
+        */
+       if (!local->monitors && !local->cooked_mntrs) {
+               dev_kfree_skb(skb);
+               return;
+       }
+
+       /* send frame to monitor interfaces now */
+
+       if (skb_headroom(skb) < sizeof(*rthdr)) {
+               printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
+               dev_kfree_skb(skb);
+               return;
+       }
+
+       rthdr = (struct ieee80211_tx_status_rtap_hdr *)
+                               skb_push(skb, sizeof(*rthdr));
+
+       memset(rthdr, 0, sizeof(*rthdr));
+       rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
+       rthdr->hdr.it_present =
+               cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
+                           (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
+                           (1 << IEEE80211_RADIOTAP_RATE));
+
+       if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
+           !is_multicast_ether_addr(hdr->addr1))
+               rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
+
+       /*
+        * XXX: Once radiotap gets the bitmap reset thing the vendor
+        *      extensions proposal contains, we can actually report
+        *      the whole set of tries we did.
+        */
+       if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
+           (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
+               rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
+       else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
+               rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
+       if (info->status.rates[0].idx >= 0 &&
+           !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
+               rthdr->rate = sband->bitrates[
+                               info->status.rates[0].idx].bitrate / 5;
+
+       /* for now report the total retry_count */
+       rthdr->data_retries = retry_count;
+
+       /* XXX: is this sufficient for BPF? */
+       skb_set_mac_header(skb, 0);
+       skb->ip_summed = CHECKSUM_UNNECESSARY;
+       skb->pkt_type = PACKET_OTHERHOST;
+       skb->protocol = htons(ETH_P_802_2);
+       memset(skb->cb, 0, sizeof(skb->cb));
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+               if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
+                       if (!netif_running(sdata->dev))
+                               continue;
+
+                       if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
+                           !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
+                           (type == IEEE80211_FTYPE_DATA))
+                               continue;
+
+                       if (prev_dev) {
+                               skb2 = skb_clone(skb, GFP_ATOMIC);
+                               if (skb2) {
+                                       skb2->dev = prev_dev;
+                                       netif_rx(skb2);
+                               }
+                       }
+
+                       prev_dev = sdata->dev;
+               }
+       }
+       if (prev_dev) {
+               skb->dev = prev_dev;
+               netif_rx(skb);
+               skb = NULL;
+       }
+       rcu_read_unlock();
+       dev_kfree_skb(skb);
+}
+EXPORT_SYMBOL(ieee80211_tx_status);