From: Mathy Vanhoef Mathy.Vanhoef@kuleuven.be
[ Upstream commit 527d675969a1dff17baa270d4447ac1c87058299 ]
Currently ieee80211_set_qos_hdr sets the QoS TID of all frames based on the value assigned to skb->priority. This means it will also overwrite the QoS TID of injected frames. The commit 753ffad3d624 ("mac80211: fix TID field in monitor mode transmit") prevented injected frames from being modified because of this 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 in the QoS field 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@kuleuven.be Link: https://lore.kernel.org/r/20201104061823.197407-4-Mathy.Vanhoef@kuleuven.be [fix typos in commit message] Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 30a0c7c6224b3..11085a4b5ee3a 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2280,10 +2280,7 @@ 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 72920d82928c4..8cd157e67fc77 100644 --- a/net/mac80211/wme.c +++ b/net/mac80211/wme.c @@ -249,6 +249,14 @@ 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 */
/*