Merge branch 'fixes' into next/cleanup

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / ip6_input.c

diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index e33fe0ab2568ec5a750e846457ff52a6a3395c86..2bab2aa597450813ae4bd60d362998830a7e7e3b 100644 (file)
--- 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