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mac80211: retransmit TDLS teardown packet through AP if not ACKed

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Since the TDLS peer station might not receive the teardown
packet (e.g., when in PS), this makes sure the packet is
retransmitted - this time through the AP - if the TDLS peer
didn't ACK the packet.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Liad Kaufman
2014-11-09 18:50:08 +02:00
committed by Johannes Berg
parent 24d342c514
commit 1277b4a9f5
5 changed files with 142 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
net/mac80211/status.c
View File

@@ -390,6 +390,46 @@ ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
}
}
/*
* Handles the tx for TDLS teardown frames.
* If the frame wasn't ACKed by the peer - it will be re-sent through the AP
*/
static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, u32 flags)
{
struct sk_buff *teardown_skb;
struct sk_buff *orig_teardown_skb;
bool is_teardown = false;
/* Get the teardown data we need and free the lock */
spin_lock(&sdata->u.mgd.teardown_lock);
teardown_skb = sdata->u.mgd.teardown_skb;
orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
if ((skb == orig_teardown_skb) && teardown_skb) {
sdata->u.mgd.teardown_skb = NULL;
sdata->u.mgd.orig_teardown_skb = NULL;
is_teardown = true;
}
spin_unlock(&sdata->u.mgd.teardown_lock);
if (is_teardown) {
/* This mechanism relies on being able to get ACKs */
WARN_ON(!(local->hw.flags &
IEEE80211_HW_REPORTS_TX_ACK_STATUS));
/* Check if peer has ACKed */
if (flags & IEEE80211_TX_STAT_ACK) {
dev_kfree_skb_any(teardown_skb);
} else {
tdls_dbg(sdata,
"TDLS Resending teardown through AP\n");
ieee80211_subif_start_xmit(teardown_skb, skb->dev);
}
}
}
static void ieee80211_report_used_skb(struct ieee80211_local *local,
struct sk_buff *skb, bool dropped)
{
@@ -426,8 +466,19 @@ static void ieee80211_report_used_skb(struct ieee80211_local *local,
if (!sdata) {
skb->dev = NULL;
} else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control,
acked);
unsigned int hdr_size =
ieee80211_hdrlen(hdr->frame_control);
/* Check to see if packet is a TDLS teardown packet */
if (ieee80211_is_data(hdr->frame_control) &&
(ieee80211_get_tdls_action(skb, hdr_size) ==
WLAN_TDLS_TEARDOWN))
ieee80211_tdls_td_tx_handle(local, sdata, skb,
info->flags);
else
ieee80211_mgd_conn_tx_status(sdata,
hdr->frame_control,
acked);
} else if (ieee80211_is_nullfunc(hdr->frame_control) ||
ieee80211_is_qos_nullfunc(hdr->frame_control)) {
cfg80211_probe_status(sdata->dev, hdr->addr1,