From b331615722779b078822988843ddffd4eaec9f83 Mon Sep 17 00:00:00 2001 From: "John W. Linville" Date: Tue, 28 Aug 2007 17:01:55 -0400 Subject: [PATCH] [MAC80211]: filter locally-originated multicast frames In STA mode, the AP will echo our traffic. This includes multicast traffic. Receiving these frames confuses some protocols and applications, notably IPv6 Duplicate Address Detection. Signed-off-by: John W. Linville Signed-off-by: Johannes Berg Acked-by: Michael Wu Signed-off-by: John W. Linville Signed-off-by: David S. Miller --- net/mac80211/rx.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index e2c6f5cd1cf7..969be3adda7a 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -988,9 +988,10 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) memcpy(dst, hdr->addr1, ETH_ALEN); memcpy(src, hdr->addr3, ETH_ALEN); - if (sdata->type != IEEE80211_IF_TYPE_STA) { + if (sdata->type != IEEE80211_IF_TYPE_STA || + (is_multicast_ether_addr(dst) && + !compare_ether_addr(src, dev->dev_addr))) return TXRX_DROP; - } break; case 0: /* DA SA BSSID */ -- 2.20.1