diff options
| -rw-r--r-- | include/net/ieee80211.h | 2 | ||||
| -rw-r--r-- | net/ieee80211/ieee80211_rx.c | 5 |
2 files changed, 7 insertions, 0 deletions
diff --git a/include/net/ieee80211.h b/include/net/ieee80211.h index cb255432e4e4..e6af381e206d 100644 --- a/include/net/ieee80211.h +++ b/include/net/ieee80211.h @@ -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); diff --git a/net/ieee80211/ieee80211_rx.c b/net/ieee80211/ieee80211_rx.c index d9265195656d..ce28d571afac 100644 --- a/net/ieee80211/ieee80211_rx.c +++ b/net/ieee80211/ieee80211_rx.c @@ -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) |