From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
This patch fixes the check at the entrance to ieee80211_rx_reorder_ampdu.
This check has been broken by 511fe3f3c4ba0b5b77421336f64a19b6cd00e65f
'mac80211: rx.c use new helpers'
Letting QoS NULL packet in ieee80211_rx_reorder_ampdu led to packet loss in
RX.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
---
include/linux/ieee80211.h | 11 +++++++++++
net/mac80211/rx.c | 2 +-
2 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index aa603c3..3865d4c 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -460,6 +460,17 @@ static inline int ieee80211_is_nullfunc(__le16 fc)
cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC);
}
+/**
+ * ieee80211_is_nullfunc - check if FTYPE=IEEE80211_FTYPE_DATA and
+ * STYPE=IEEE80211_STYPE_QOS_NULLFUNC
+ * @fc: frame control bytes in little-endian byteorder
+ */
+static inline int ieee80211_is_qos_nullfunc(__le16 fc)
+{
+ return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
+ cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
+}
+
struct ieee80211s_hdr {
u8 flags;
u8 ttl;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 6a88e8f..a6e8214 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2052,7 +2052,7 @@ static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
/* null data frames are excluded */
- if (unlikely(ieee80211_is_nullfunc(hdr->frame_control)))
+ if (unlikely(ieee80211_is_qos_nullfunc(hdr->frame_control)))
goto end_reorder;
/* new un-ordered ampdu frame - process it */
--
1.5.4.1
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