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

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)