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 b1876e52091e1ea2568b5b1acf9411df5986ef84..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
@@ -281,7 +293,8 @@ int ip6_mc_input(struct sk_buff *skb)
         *      IPv6 multicast router mode is now supported ;)
         */
        if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
-           !(ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) &&
+           !(ipv6_addr_type(&hdr->daddr) &
+             (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) &&
            likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
                /*
                 * Okay, we try to forward - split and duplicate