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/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2008-2010 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 <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "rate.h"
#include "mesh.h"
#include "led.h"
#include "wme.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);
struct ieee80211_hdr *hdr = (void *)skb->data;
int ac;

/*
* This skb 'survived' a round-trip through the driver, and
* hopefully the driver didn't mangle it too badly. However,
* we can definitely not rely on the control information
* being correct. Clear it so we don't get junk there, and
* indicate that it needs new processing, but must not be
* modified/encrypted again.
*/
memset(&info->control, 0, sizeof(info->control));

info->control.jiffies = jiffies;
info->control.vif = &sta->sdata->vif;
info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
IEEE80211_TX_INTFL_RETRANSMISSION;
info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;

sta->tx_filtered_count++;

/*
* Clear more-data bit on filtered frames, it might be set
* but later frames might time out so it might have to be
* clear again ... It's all rather unlikely (this frame
* should time out first, right?) but let's not confuse
* peers unnecessarily.
*/
if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);

if (ieee80211_is_data_qos(hdr->frame_control)) {
u8 *p = ieee80211_get_qos_ctl(hdr);
int tid = *p & IEEE80211_QOS_CTL_TID_MASK;

/*
* Clear EOSP if set, this could happen e.g.
* if an absence period (us being a P2P GO)
* shortens the SP.
*/
if (*p & IEEE80211_QOS_CTL_EOSP)
*p &= ~IEEE80211_QOS_CTL_EOSP;
ac = ieee802_1d_to_ac[tid & 7];
} else {
ac = IEEE80211_AC_BE;
}

/*
* 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_flag(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.
* (c) if PS mode transitions are manual (i.e. the flag
* %IEEE80211_HW_AP_LINK_PS is set), always process PS state
* changes before calling TX status events if ordering can be
* unknown.
*/
if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
skb_queue_tail(&sta->tx_filtered[ac], skb);
sta_info_recalc_tim(sta);

if (!timer_pending(&local->sta_cleanup))
mod_timer(&local->sta_cleanup,
round_jiffies(jiffies +
STA_INFO_CLEANUP_INTERVAL));
return;
}

if (!test_sta_flag(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;
}

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (net_ratelimit())
wiphy_debug(local->hw.wiphy,
"dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
skb_queue_len(&sta->tx_filtered[ac]),
!!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
#endif
dev_kfree_skb(skb);
}

static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
{
struct tid_ampdu_tx *tid_tx;

tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
if (!tid_tx || !tid_tx->bar_pending)
return;

tid_tx->bar_pending = false;
ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
}

static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (void *) skb->data;
struct ieee80211_local *local = sta->local;
struct ieee80211_sub_if_data *sdata = sta->sdata;

if (ieee80211_is_data_qos(mgmt->frame_control)) {
struct ieee80211_hdr *hdr = (void *) skb->data;
u8 *qc = ieee80211_get_qos_ctl(hdr);
u16 tid = qc[0] & 0xf;

ieee80211_check_pending_bar(sta, hdr->addr1, tid);
}

if (ieee80211_is_action(mgmt->frame_control) &&
sdata->vif.type == NL80211_IFTYPE_STATION &&
mgmt->u.action.category == WLAN_CATEGORY_HT &&
mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
/*
* This update looks racy, but isn't -- if we come
* here we've definitely got a station that we're
* talking to, and on a managed interface that can
* only be the AP. And the only other place updating
* this variable is before we're associated.
*/
switch (mgmt->u.action.u.ht_smps.smps_control) {
case WLAN_HT_SMPS_CONTROL_DYNAMIC:
sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
break;
case WLAN_HT_SMPS_CONTROL_STATIC:
sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
break;
case WLAN_HT_SMPS_CONTROL_DISABLED:
default: /* shouldn't happen since we don't send that */
sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
break;
}

ieee80211_queue_work(&local->hw, &local->recalc_smps);
}
}

static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
{
struct tid_ampdu_tx *tid_tx;

tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
if (!tid_tx)
return;

tid_tx->failed_bar_ssn = ssn;
tid_tx->bar_pending = true;
}

static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
{
int len = sizeof(struct ieee80211_radiotap_header);

/* IEEE80211_RADIOTAP_RATE rate */
if (info->status.rates[0].idx >= 0 &&
!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
len += 2;

/* IEEE80211_RADIOTAP_TX_FLAGS */
len += 2;

/* IEEE80211_RADIOTAP_DATA_RETRIES */
len += 1;

/* IEEE80211_TX_RC_MCS */
if (info->status.rates[0].idx >= 0 &&
info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
len += 3;

return len;
}

static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band
*sband, struct sk_buff *skb,
int retry_count, int rtap_len)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_radiotap_header *rthdr;
unsigned char *pos;
u16 txflags;

rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);

memset(rthdr, 0, rtap_len);
rthdr->it_len = cpu_to_le16(rtap_len);
rthdr->it_present =
cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
(1 << IEEE80211_RADIOTAP_DATA_RETRIES));
pos = (unsigned char *)(rthdr + 1);

/*
* XXX: Once radiotap gets the bitmap reset thing the vendor
* extensions proposal contains, we can actually report
* the whole set of tries we did.
*/

/* IEEE80211_RADIOTAP_RATE */
if (info->status.rates[0].idx >= 0 &&
!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
*pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5;
/* padding for tx flags */
pos += 2;
}

/* IEEE80211_RADIOTAP_TX_FLAGS */
txflags = 0;
if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
!is_multicast_ether_addr(hdr->addr1))
txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;

if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
(info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
txflags |= IEEE80211_RADIOTAP_F_TX_RTS;

put_unaligned_le16(txflags, pos);
pos += 2;

/* IEEE80211_RADIOTAP_DATA_RETRIES */
/* for now report the total retry_count */
*pos = retry_count;
pos++;

/* IEEE80211_TX_RC_MCS */
if (info->status.rates[0].idx >= 0 &&
info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
IEEE80211_RADIOTAP_MCS_HAVE_GI |
IEEE80211_RADIOTAP_MCS_HAVE_BW;
if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
pos[2] = info->status.rates[0].idx;
pos += 3;
}

}

/*
* Use a static threshold for now, best value to be determined
* by testing ...
* Should it depend on:
* - on # of retransmissions
* - current throughput (higher value for higher tpt)?
*/
#define STA_LOST_PKT_THRESHOLD 50

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_sub_if_data *sdata;
struct net_device *prev_dev = NULL;
struct sta_info *sta, *tmp;
int retry_count = -1, i;
int rates_idx = -1;
bool send_to_cooked;
bool acked;
struct ieee80211_bar *bar;
u16 tid;
int rtap_len;

for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
if (info->status.rates[i].idx < 0) {
break;
} else if (i >= hw->max_report_rates) {
/* the HW cannot have attempted that rate */
info->status.rates[i].idx = -1;
info->status.rates[i].count = 0;
break;
}

retry_count += info->status.rates[i].count;
}
rates_idx = i - 1;

if (retry_count < 0)
retry_count = 0;

rcu_read_lock();

sband = local->hw.wiphy->bands[info->band];
fc = hdr->frame_control;

for_each_sta_info(local, hdr->addr1, sta, tmp) {
/* skip wrong virtual interface */
if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
continue;

if (info->flags & IEEE80211_TX_STATUS_EOSP)
clear_sta_flag(sta, WLAN_STA_SP);

acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
if (!acked && test_sta_flag(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;
}

if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
(rates_idx != -1))
sta->last_tx_rate = info->status.rates[rates_idx];

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->vif, hdr->addr1,
tid, ssn);
}

if (!acked && ieee80211_is_back_req(fc)) {
u16 control;

/*
* BAR failed, store the last SSN and retry sending
* the BAR when the next unicast transmission on the
* same TID succeeds.
*/
bar = (struct ieee80211_bar *) skb->data;
control = le16_to_cpu(bar->control);
if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
u16 ssn = le16_to_cpu(bar->start_seq_num);

tid = (control &
IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
IEEE80211_BAR_CTRL_TID_INFO_SHIFT;

ieee80211_set_bar_pending(sta, tid, ssn);
}
}

if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
ieee80211_handle_filtered_frame(local, sta, skb);
rcu_read_unlock();
return;
} else {
if (!acked)
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);

if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
ieee80211_frame_acked(sta, skb);

if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);

if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
if (info->flags & IEEE80211_TX_STAT_ACK) {
if (sta->lost_packets)
sta->lost_packets = 0;
} else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
cfg80211_cqm_pktloss_notify(sta->sdata->dev,
sta->sta.addr,
sta->lost_packets,
GFP_ATOMIC);
sta->lost_packets = 0;
}
}
}

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++;
}

if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
local->ps_sdata && !(local->scanning)) {
if (info->flags & IEEE80211_TX_STAT_ACK) {
local->ps_sdata->u.mgd.flags |=
IEEE80211_STA_NULLFUNC_ACKED;
} else
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(10));
}

if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
struct ieee80211_work *wk;
u64 cookie = (unsigned long)skb;

rcu_read_lock();
list_for_each_entry_rcu(wk, &local->work_list, list) {
if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX)
continue;
if (wk->offchan_tx.frame != skb)
continue;
wk->offchan_tx.status = true;
break;
}
rcu_read_unlock();
if (local->hw_roc_skb_for_status == skb) {
cookie = local->hw_roc_cookie ^ 2;
local->hw_roc_skb_for_status = NULL;
}

cfg80211_mgmt_tx_status(
skb->dev, cookie, skb->data, skb->len,
!!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
}

/* this was a transmitted frame, but now we want to reuse it */
skb_orphan(skb);

/* Need to make a copy before skb->cb gets cleared */
send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
(type != IEEE80211_FTYPE_DATA);

/*
* This is a bit racy but we can avoid a lot of work
* with this test...
*/
if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
dev_kfree_skb(skb);
return;
}

/* send frame to monitor interfaces now */
rtap_len = ieee80211_tx_radiotap_len(info);
if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
dev_kfree_skb(skb);
return;
}
ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len);

/* 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 (!ieee80211_sdata_running(sdata))
continue;

if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
!send_to_cooked)
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);

void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
num_packets, GFP_ATOMIC);
}
EXPORT_SYMBOL(ieee80211_report_low_ack);
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