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Message-ID: <20130210153522.GA20897@order.stressinduktion.org> Date: Sun, 10 Feb 2013 16:35:22 +0100 From: Hannes Frederic Sowa <hannes@...essinduktion.org> To: netdev@...r.kernel.org Subject: [PATCH v2] ipv6: don't accept multicast traffic with scop 0 v2: a) moved before multicast source address check b) changed comment to netdev style Cc: Erik Hugne <erik.hugne@...csson.com> Cc: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org> Acked-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org> --- 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 4ac5bf3..521d9fd 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -118,6 +118,15 @@ 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 scop + * 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 netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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