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[PATCH] ieee80211: Drop and count duplicate data frames to remove 'replay detected' log messages

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In the SoftMAC version of the IEEE 802.11 stack, not all duplicate messages are
detected. For the most part, there is no difficulty; however for TKIP and CCMP
encryption, the duplicates result in a "replay detected" log message where the
received and previous values of the TSC are identical. This change adds a new
variable to the ieee80211_device structure that holds the 'seq_ctl' value for
the previous frame. When a new frame repeats the value, the frame is dropped and
the appropriate counter is incremented.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Larry Finger 2006-10-03 18:49:32 -05:00 committed by Jeff Garzik
parent 42a4cf9576
commit 837925df02
2 changed files with 7 additions and 0 deletions
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2
include/net/ieee80211.h
View File

@ -1080,6 +1080,8 @@ struct ieee80211_device {
int perfect_rssi;
int worst_rssi;
u16 prev_seq_ctl; /* used to drop duplicate frames */
/* Callback functions */
void (*set_security) (struct net_device * dev,
struct ieee80211_security * sec);

5
net/ieee80211/ieee80211_rx.c
View File

@ -478,6 +478,11 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
goto rx_exit;
}
#endif
/* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
if (sc == ieee->prev_seq_ctl)
goto rx_dropped;
else
ieee->prev_seq_ctl = sc;
/* Data frame - extract src/dst addresses */
if (skb->len < IEEE80211_3ADDR_LEN)