[IPV6]: Try not to send icmp to anycast address. (8de3351e) · Commits · 戴 / test

net/ipv6/icmp.c

+14 −2

Original line number	Diff line number	Diff line
		@@ -328,8 +328,10 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
		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 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
		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;