Currently ieee80211_set_qos_hdr overwrites the QoS TID of injected
frames based on the value assigned to skb->priority. The commit
753ffad3d624 ("mac80211: fix TID field in monitor mode transmit")
worked around this problem by setting skb->priority to the TID of
the injected frame, which assured the QoS TID will not be changed
to a different value. Unfortunately, this workaround complicates
the handling of injected frames because we can't set skb->priority
without affecting the TID value of injected frames.
To avoid this, and to simplify the next patch, detect if a frame is
injected in ieee80211_set_qos_hdr and if so do not change its QoS
field.
Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@xxxxxxxxxxx>
---
net/mac80211/tx.c | 5 +----
net/mac80211/wme.c | 8 ++++++++
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 23fa19148..96069683f 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2266,10 +2266,7 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
payload[7]);
}
- /*
- * Initialize skb->priority for QoS frames. This is put in the TID field
- * of the frame before passing it to the driver.
- */
+ /* Initialize skb->priority for QoS frames */
if (ieee80211_is_data_qos(hdr->frame_control)) {
u8 *p = ieee80211_get_qos_ctl(hdr);
skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
index a49dd7f1f..e66d1463d 100644
--- a/net/mac80211/wme.c
+++ b/net/mac80211/wme.c
@@ -252,6 +252,14 @@ void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
p = ieee80211_get_qos_ctl(hdr);
+ /* don't overwrite the QoS field of injected frames */
+ if (info->flags & IEEE80211_TX_CTL_INJECTED) {
+ /* do take into account Ack policy of injected frames */
+ if (*p & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
+ info->flags |= IEEE80211_TX_CTL_NO_ACK;
+ return;
+ }
+
/* set up the first byte */
/*
--
2.27.0
