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Commit b3316157 authored by John W. Linville's avatar John W. Linville Committed by David S. Miller
Browse files

[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: default avatarJohn W. Linville <linville@tuxdriver.com>
Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Acked-by: default avatarMichael Wu <flamingice@sourmilk.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3c3b00ca

net/mac80211/rx.c

+3 −2
Original line number Diff line number Diff line
@@ -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 */