diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 54944da..3a2ba56 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -379,6 +379,39 @@
 }
 EXPORT_SYMBOL_GPL(inet_csk_route_req);
 
+struct dst_entry *inet_csk_route_child_sock(struct sock *sk,
+					    struct sock *newsk,
+					    const struct request_sock *req)
+{
+	const struct inet_request_sock *ireq = inet_rsk(req);
+	struct inet_sock *newinet = inet_sk(newsk);
+	struct ip_options_rcu *opt = ireq->opt;
+	struct net *net = sock_net(sk);
+	struct flowi4 *fl4;
+	struct rtable *rt;
+
+	fl4 = &newinet->cork.fl.u.ip4;
+	flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark,
+			   RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
+			   sk->sk_protocol, inet_sk_flowi_flags(sk),
+			   (opt && opt->opt.srr) ? opt->opt.faddr : ireq->rmt_addr,
+			   ireq->loc_addr, ireq->rmt_port, inet_sk(sk)->inet_sport);
+	security_req_classify_flow(req, flowi4_to_flowi(fl4));
+	rt = ip_route_output_flow(net, fl4, sk);
+	if (IS_ERR(rt))
+		goto no_route;
+	if (opt && opt->opt.is_strictroute && fl4->daddr != rt->rt_gateway)
+		goto route_err;
+	return &rt->dst;
+
+route_err:
+	ip_rt_put(rt);
+no_route:
+	IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(inet_csk_route_child_sock);
+
 static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport,
 				 const u32 rnd, const u32 synq_hsize)
 {