[IPV6]: Try not to send icmp to anycast address.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 34a3322..6ec6a2b 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -328,8 +328,10 @@
iif = skb->dev->ifindex;
/*
- * Must not send if we know that source is Anycast also.
- * for now we don't know that.
+ * Must not send error if the source does not uniquely
+ * identify a single node (RFC2463 Section 2.4).
+ * We check unspecified / multicast addresses here,
+ * and anycast addresses will be checked later.
*/
if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n");
@@ -373,6 +375,16 @@
err = ip6_dst_lookup(sk, &dst, &fl);
if (err)
goto out;
+
+ /*
+ * We won't send icmp if the destination is known
+ * anycast.
+ */
+ if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
+ LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n");
+ goto out_dst_release;
+ }
+
if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
goto out;
