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mac80211: also drop qos-nullfunc frames silently 

We drop nullfunc frames, but not qos-nullfunc frames,
even though those could be used for PS state control
as well.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-10-30 12:55:03 +01:00 committed by John W. Linville
parent e7d17cf4f7
commit 22403def13
2 changed files with 21 additions and 6 deletions
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12
include/linux/ieee80211.h
View File

@ -472,7 +472,7 @@ static inline int ieee80211_is_cfendack(__le16 fc)
}
/**
* ieee80211_is_nullfunc - check if FTYPE=IEEE80211_FTYPE_DATA and STYPE=IEEE80211_STYPE_NULLFUNC
* ieee80211_is_nullfunc - check if frame is a regular (non-QoS) nullfunc frame
* @fc: frame control bytes in little-endian byteorder
*/
static inline int ieee80211_is_nullfunc(__le16 fc)
@ -481,6 +481,16 @@ static inline int ieee80211_is_nullfunc(__le16 fc)
cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC);
}
/**
* ieee80211_is_qos_nullfunc - check if frame is a QoS nullfunc frame
* @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;

15
net/mac80211/rx.c
View File

@ -886,12 +886,17 @@ ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
}
}
/* Drop data::nullfunc frames silently, since they are used only to
* control station power saving mode. */
if (ieee80211_is_nullfunc(hdr->frame_control)) {
/*
* Drop (qos-)data::nullfunc frames silently, since they
* are used only to control station power saving mode.
*/
if (ieee80211_is_nullfunc(hdr->frame_control) ||
ieee80211_is_qos_nullfunc(hdr->frame_control)) {
I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
/* Update counter and free packet here to avoid counting this
* as a dropped packed. */
/*
* Update counter and free packet here to avoid
* counting this as a dropped packed.
*/
sta->rx_packets++;
dev_kfree_skb(rx->skb);
return RX_QUEUED;