From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161544Ab3DKVZN (ORCPT ); Thu, 11 Apr 2013 17:25:13 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:5406 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935353Ab3DKUsq (ORCPT ); Thu, 11 Apr 2013 16:48:46 -0400 X-Authority-Analysis: v=2.0 cv=F+XVh9dN c=1 sm=0 a=rXTBtCOcEpjy1lPqhTCpEQ==:17 a=mNMOxpOpBa8A:10 a=Ciwy3NGCPMMA:10 a=LPQgcGZooFIA:10 a=5SG0PmZfjMsA:10 a=bbbx4UPp9XUA:10 a=meVymXHHAAAA:8 a=hOtw70lm4rUA:10 a=SaWEO8HGAAAA:8 a=BqEg4_3jAAAA:8 a=0FD05c-RAAAA:8 a=h1aNt0RaAAAA:8 a=J1Y8HTJGAAAA:8 a=BB2yP35R4JOlXsOE4uIA:9 a=mhd2NDuUijAA:10 a=w2ubnULX9RwA:10 a=f7GxY0FH8QIA:10 a=9n0VZpmWo7gA:10 a=4N9Db7Z2_RYA:10 a=jeBq3FmKZ4MA:10 a=rXTBtCOcEpjy1lPqhTCpEQ==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.67.115.198 Message-Id: <20130411202613.296921116@goodmis.org> User-Agent: quilt/0.60-1 Date: Thu, 11 Apr 2013 16:27:48 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Erik Hugne , YOSHIFUJI Hideaki , Hannes Frederic Sowa , "David S. Miller" Subject: [ 165/171 ] ipv6: dont accept node local multicast traffic from the wire References: <20130411202503.783159048@goodmis.org> Content-Disposition: inline; filename=0165-ipv6-don-t-accept-node-local-multicast-traffic-from-.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.6.11.2 stable review patch. If anyone has any objections, please let me know. ------------------ From: Hannes Frederic Sowa [ Upstream commit 1c4a154e5253687c51123956dfcee9e9dfa8542d ] Erik Hugne's errata proposal (Errata ID: 3480) to RFC4291 has been verified: http://www.rfc-editor.org/errata_search.php?eid=3480 We have to check for pkt_type and loopback flag because either the packets are allowed to travel over the loopback interface (in which case pkt_type is PACKET_HOST and IFF_LOOPBACK flag is set) or they travel over a non-loopback interface back to us (in which case PACKET_TYPE is PACKET_LOOPBACK and IFF_LOOPBACK flag is not set). Cc: Erik Hugne Cc: YOSHIFUJI Hideaki Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller Signed-off-by: Steven Rostedt --- net/ipv6/ip6_input.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index db70b88..dee9964 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -118,6 +118,18 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt ipv6_addr_loopback(&hdr->daddr)) goto err; + /* RFC4291 Errata ID: 3480 + * Interface-Local scope spans only a single interface on a + * node and is useful only for loopback transmission of + * multicast. Packets with interface-local scope received + * from another node must be discarded. + */ + if (!(skb->pkt_type == PACKET_LOOPBACK || + dev->flags & IFF_LOOPBACK) && + ipv6_addr_is_multicast(&hdr->daddr) && + IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1) + 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 -- 1.7.10.4