342 lines
10 KiB
C
342 lines
10 KiB
C
/*
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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 2008-2009 Johannes Berg <johannes@sipsolutions.net>
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*
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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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*/
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "rate.h"
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#include "mesh.h"
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#include "led.h"
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void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
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struct sk_buff *skb)
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{
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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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int tmp;
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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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tmp--;
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I802_DEBUG_INC(local->tx_status_drop);
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}
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tasklet_schedule(&local->tasklet);
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}
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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 sta_info *sta,
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struct sk_buff *skb)
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{
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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/*
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* XXX: This is temporary!
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*
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* The problem here is that when we get here, the driver will
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* quite likely have pretty much overwritten info->control by
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* using info->driver_data or info->rate_driver_data. Thus,
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* when passing out the frame to the driver again, we would be
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* passing completely bogus data since the driver would then
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* expect a properly filled info->control. In mac80211 itself
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* the same problem occurs, since we need info->control.vif
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* internally.
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*
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* To fix this, we should send the frame through TX processing
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* again. However, it's not that simple, since the frame will
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* have been software-encrypted (if applicable) already, and
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* encrypting it again doesn't do much good. So to properly do
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* that, we not only have to skip the actual 'raw' encryption
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* (key selection etc. still has to be done!) but also the
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* sequence number assignment since that impacts the crypto
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* encapsulation, of course.
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*
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* Hence, for now, fix the bug by just dropping the frame.
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*/
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goto drop;
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sta->tx_filtered_count++;
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/*
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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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*/
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set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
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/*
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* This code races in the following way:
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*
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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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*
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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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*
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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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*
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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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* functions and
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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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* bits.
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*/
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if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
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skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
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skb_queue_tail(&sta->tx_filtered, skb);
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return;
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}
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if (!test_sta_flags(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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return;
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}
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drop:
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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if (net_ratelimit())
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printk(KERN_DEBUG "%s: dropped TX filtered frame, "
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"queue_len=%d PS=%d @%lu\n",
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wiphy_name(local->hw.wiphy),
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skb_queue_len(&sta->tx_filtered),
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!!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
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#endif
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dev_kfree_skb(skb);
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}
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void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
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{
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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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u16 frag, type;
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__le16 fc;
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struct ieee80211_supported_band *sband;
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struct ieee80211_tx_status_rtap_hdr *rthdr;
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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;
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int retry_count = -1, i;
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bool injected;
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for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
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/* the HW cannot have attempted that rate */
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if (i >= hw->max_rates) {
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info->status.rates[i].idx = -1;
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info->status.rates[i].count = 0;
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}
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retry_count += info->status.rates[i].count;
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}
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if (retry_count < 0)
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retry_count = 0;
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rcu_read_lock();
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sband = local->hw.wiphy->bands[info->band];
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sta = sta_info_get(local, hdr->addr1);
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if (sta) {
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if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
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test_sta_flags(sta, WLAN_STA_PS_STA)) {
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/*
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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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*/
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ieee80211_handle_filtered_frame(local, sta, skb);
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rcu_read_unlock();
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return;
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}
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fc = hdr->frame_control;
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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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u16 tid, ssn;
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u8 *qc;
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qc = ieee80211_get_qos_ctl(hdr);
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tid = qc[0] & 0xf;
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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, hdr->addr1,
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tid, ssn);
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}
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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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rcu_read_unlock();
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return;
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} else {
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if (!(info->flags & IEEE80211_TX_STAT_ACK))
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sta->tx_retry_failed++;
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sta->tx_retry_count += retry_count;
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}
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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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}
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rcu_read_unlock();
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ieee80211_led_tx(local, 0);
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/* SNMP counters
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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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if (frag == 0) {
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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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if (retry_count > 0)
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local->dot11RetryCount++;
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if (retry_count > 1)
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local->dot11MultipleRetryCount++;
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}
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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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* or Management. */
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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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} else {
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if (frag == 0)
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local->dot11FailedCount++;
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}
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/* this was a transmitted frame, but now we want to reuse it */
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skb_orphan(skb);
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/*
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* This is a bit racy but we can avoid a lot of work
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* with this test...
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*/
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if (!local->monitors && !local->cooked_mntrs) {
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dev_kfree_skb(skb);
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return;
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}
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/* send frame to monitor interfaces now */
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if (skb_headroom(skb) < sizeof(*rthdr)) {
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printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
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dev_kfree_skb(skb);
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return;
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}
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rthdr = (struct ieee80211_tx_status_rtap_hdr *)
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skb_push(skb, sizeof(*rthdr));
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memset(rthdr, 0, sizeof(*rthdr));
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rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
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rthdr->hdr.it_present =
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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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(1 << IEEE80211_RADIOTAP_RATE));
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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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rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
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/*
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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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*/
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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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rthdr->tx_flags |= cpu_to_le16(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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rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
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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->rate = sband->bitrates[
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info->status.rates[0].idx].bitrate / 5;
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/* for now report the total retry_count */
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rthdr->data_retries = retry_count;
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/* Need to make a copy before skb->cb gets cleared */
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injected = !!(info->flags & IEEE80211_TX_CTL_INJECTED);
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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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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
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if (!netif_running(sdata->dev))
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continue;
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if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
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!injected &&
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(type == IEEE80211_FTYPE_DATA))
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continue;
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if (prev_dev) {
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skb2 = skb_clone(skb, GFP_ATOMIC);
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if (skb2) {
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skb2->dev = prev_dev;
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netif_rx(skb2);
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}
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}
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prev_dev = sdata->dev;
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}
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}
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if (prev_dev) {
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skb->dev = prev_dev;
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netif_rx(skb);
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skb = NULL;
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}
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rcu_read_unlock();
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dev_kfree_skb(skb);
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}
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EXPORT_SYMBOL(ieee80211_tx_status);
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