+static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
+{
+ struct sockaddr_in sin;
+ struct iphdr *iph = ip_hdr(skb);
+ __be16 *ports = (__be16 *)skb_transport_header(skb);
+
+ if (skb_transport_offset(skb) + 4 > skb->len)
+ return;
+
+ /* All current transport protocols have the port numbers in the
+ * first four bytes of the transport header and this function is
+ * written with this assumption in mind.
+ */
+
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = iph->daddr;
+ sin.sin_port = ports[1];
+ memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
+
+ put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
+}