From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934567Ab3DGW4F (ORCPT ); Sun, 7 Apr 2013 18:56:05 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:46350 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934522Ab3DGW4D (ORCPT ); Sun, 7 Apr 2013 18:56:03 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Erik Hugne" , "YOSHIFUJI Hideaki" , "David S. Miller" , "Hannes Frederic Sowa" Date: Sun, 07 Apr 2013 23:45:43 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [66/74] ipv6: don't accept multicast traffic with scope 0 In-Reply-To: X-SA-Exim-Connect-IP: 2001:470:1f08:1539:b4b3:7e2a:e2d0:3478 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.43-rc1 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 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: Ben Hutchings --- 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 f8d24dd..15295e9 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