From c457338d7acd3823e765b684a62294cfda9d2f55 Mon Sep 17 00:00:00 2001 From: Brian Haley Date: Tue, 8 Nov 2011 04:41:42 +0000 Subject: [PATCH] ipv6: drop packets when source address is multicast RFC 4291 Section 2.7 says Multicast addresses must not be used as source addresses in IPv6 packets - drop them on input so we don't process the packet further. Signed-off-by: Brian Haley Reported-and-Tested-by: Kumar Sanghvi Signed-off-by: David S. Miller --- net/ipv6/ip6_input.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index 027c7ff6f1e5..a46c64eb0a66 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -111,6 +111,14 @@ 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 + * Multicast addresses must not be used as source addresses in IPv6 + * packets or appear in any Routing header. + */ + if (ipv6_addr_is_multicast(&hdr->saddr)) + goto err; + skb->transport_header = skb->network_header + sizeof(*hdr); IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); -- 2.30.2