Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935873Ab3DHJwh (ORCPT ); Mon, 8 Apr 2013 05:52:37 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:42965 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935795Ab3DHJwc (ORCPT ); Mon, 8 Apr 2013 05:52:32 -0400 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Erik Hugne , YOSHIFUJI Hideaki , Hannes Frederic Sowa , "David S. Miller" , Luis Henriques Subject: [PATCH 075/102] ipv6: don't accept multicast traffic with scope 0 Date: Mon, 8 Apr 2013 10:50:30 +0100 Message-Id: <1365414657-29191-76-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1365414657-29191-1-git-send-email-luis.henriques@canonical.com> References: <1365414657-29191-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1710 Lines: 51 3.5.7.10 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Hannes Frederic Sowa commit 20314092c1b41894d8c181bf9aa6f022be2416aa upstream. v2: a) moved before multicast source address check b) changed comment to netdev style Cc: Erik Hugne Cc: YOSHIFUJI Hideaki Acked-by: YOSHIFUJI Hideaki Signed-off-by: Hannes Frederic Sowa Acked-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller Signed-off-by: Luis Henriques --- net/ipv6/ip6_input.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index 61dfb1d..311eac7 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -111,6 +111,15 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt 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 -- 1.8.1.2 -- 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/