Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964788Ab3DBWSt (ORCPT ); Tue, 2 Apr 2013 18:18:49 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:33655 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933847Ab3DBWOm (ORCPT ); Tue, 2 Apr 2013 18:14:42 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, YOSHIFUJI Hideaki , Erik Hugne , Hannes Frederic Sowa , "David S. Miller" Subject: [ 62/68] ipv6: dont accept multicast traffic with scope 0 Date: Tue, 2 Apr 2013 15:13:51 -0700 Message-Id: <20130402221337.133612533@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.rc1.5.g7e0651a In-Reply-To: <20130402221329.915209206@linuxfoundation.org> References: <20130402221329.915209206@linuxfoundation.org> User-Agent: quilt/0.60-5.1.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1575 Lines: 49 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hannes Frederic Sowa [ Upstream commit 20314092c1b41894d8c181bf9aa6f022be2416aa ] v2: a) moved before multicast source address check b) changed comment to netdev style Acked-by: YOSHIFUJI Hideaki Cc: Erik Hugne Cc: YOSHIFUJI Hideaki Signed-off-by: Hannes Frederic Sowa Acked-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/ip6_input.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -111,6 +111,15 @@ int ipv6_rcv(struct sk_buff *skb, struct ipv6_addr_loopback(&hdr->daddr)) goto err; + /* RFC4291 2.7 + * Nodes must not originate a packet to a multicast address whose scope + * field contains the reserved value 0; if such a packet is received, it + * must be silently dropped. + */ + if (ipv6_addr_is_multicast(&hdr->daddr) && + IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0) + goto err; + /* * RFC4291 2.7 * Multicast addresses must not be used as source addresses in IPv6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/