1 files changed, 9 insertions, 0 deletions

diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index f77a6011c302..34e5a96623ae 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -100,6 +100,15 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
         if (hdr->version != 6)
                 goto err;
 
+        /*
+         * RFC4291 2.5.3
+         * A packet received on an interface with a destination address
+         * of loopback must be dropped.
+         */
+        if (!(dev->flags & IFF_LOOPBACK) &&
+            ipv6_addr_loopback(&hdr->daddr))
+                goto err;
+
         skb->transport_header = skb->network_header + sizeof(*hdr);
         IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);