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[MAC80211]: filter locally-originated multicast frames

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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 <linville@tuxdriver.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John W. Linville 2007-08-28 17:01:55 -04:00 committed by David S. Miller
parent 3c3b00caf9
commit b331615722
1 changed files with 3 additions and 2 deletions
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5
net/mac80211/rx.c
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@ -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 */