diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index ab29daf..96b0e66 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -139,16 +139,22 @@
 /*
  *	Store a destination cache entry in a socket
  */
-static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
-				     struct in6_addr *daddr)
+static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
+				   struct in6_addr *daddr)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct rt6_info *rt = (struct rt6_info *) dst;
 
-	write_lock(&sk->sk_dst_lock);
 	sk_setup_caps(sk, dst);
 	np->daddr_cache = daddr;
 	np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
+}
+
+static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
+				 struct in6_addr *daddr)
+{
+	write_lock(&sk->sk_dst_lock);
+	__ip6_dst_store(sk, dst, daddr);
 	write_unlock(&sk->sk_dst_lock);
 }
 
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index a8fdf79..ece7e8a 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -468,6 +468,9 @@
 extern int			ip6_dst_lookup(struct sock *sk,
 					       struct dst_entry **dst,
 					       struct flowi *fl);
+extern int			ip6_sk_dst_lookup(struct sock *sk,
+						  struct dst_entry **dst,
+						  struct flowi *fl);
 
 /*
  *	skb processing functions
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 9f3d4d7..610c722 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -230,7 +230,7 @@
 	ipv6_addr_copy(&np->saddr, saddr);
 	inet->rcv_saddr = LOOPBACK4_IPV6;
 
-	ip6_dst_store(sk, dst, NULL);
+	__ip6_dst_store(sk, dst, NULL);
 
 	icsk->icsk_ext_hdr_len = 0;
 	if (np->opt != NULL)
@@ -863,7 +863,7 @@
 	 * comment in that function for the gory details. -acme
 	 */
 
-	ip6_dst_store(newsk, dst, NULL);
+	__ip6_dst_store(newsk, dst, NULL);
 	newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 						      NETIF_F_TSO);
 	newdp6 = (struct dccp6_sock *)newsk;
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 5a0ba58..ac85e9c 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -658,7 +658,7 @@
 			return err;
 		}
 
-		ip6_dst_store(sk, dst, NULL);
+		__ip6_dst_store(sk, dst, NULL);
 	}
 
 	return 0;
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index 5c950cc..bf49107 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -185,7 +185,7 @@
 			return err;
 		}
 
-		ip6_dst_store(sk, dst, NULL);
+		__ip6_dst_store(sk, dst, NULL);
 	}
 
 	skb->dst = dst_clone(dst);
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 3bc74ce..5e74a37 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -723,48 +723,51 @@
 	return err;
 }
 
-int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
+static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
+					  struct dst_entry *dst,
+					  struct flowi *fl)
 {
-	int err = 0;
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct rt6_info *rt = (struct rt6_info *)dst;
 
-	*dst = NULL;
-	if (sk) {
-		struct ipv6_pinfo *np = inet6_sk(sk);
-	
-		*dst = sk_dst_check(sk, np->dst_cookie);
-		if (*dst) {
-			struct rt6_info *rt = (struct rt6_info*)*dst;
-	
-			/* Yes, checking route validity in not connected
-			 * case is not very simple. Take into account,
-			 * that we do not support routing by source, TOS,
-			 * and MSG_DONTROUTE 		--ANK (980726)
-			 *
-			 * 1. If route was host route, check that
-			 *    cached destination is current.
-			 *    If it is network route, we still may
-			 *    check its validity using saved pointer
-			 *    to the last used address: daddr_cache.
-			 *    We do not want to save whole address now,
-			 *    (because main consumer of this service
-			 *    is tcp, which has not this problem),
-			 *    so that the last trick works only on connected
-			 *    sockets.
-			 * 2. oif also should be the same.
-			 */
-			if (((rt->rt6i_dst.plen != 128 ||
-			      !ipv6_addr_equal(&fl->fl6_dst,
-					       &rt->rt6i_dst.addr))
-			     && (np->daddr_cache == NULL ||
-				 !ipv6_addr_equal(&fl->fl6_dst,
-						  np->daddr_cache)))
-			    || (fl->oif && fl->oif != (*dst)->dev->ifindex)) {
-				dst_release(*dst);
-				*dst = NULL;
-			}
-		}
+	if (!dst)
+		goto out;
+
+	/* Yes, checking route validity in not connected
+	 * case is not very simple. Take into account,
+	 * that we do not support routing by source, TOS,
+	 * and MSG_DONTROUTE 		--ANK (980726)
+	 *
+	 * 1. If route was host route, check that
+	 *    cached destination is current.
+	 *    If it is network route, we still may
+	 *    check its validity using saved pointer
+	 *    to the last used address: daddr_cache.
+	 *    We do not want to save whole address now,
+	 *    (because main consumer of this service
+	 *    is tcp, which has not this problem),
+	 *    so that the last trick works only on connected
+	 *    sockets.
+	 * 2. oif also should be the same.
+	 */
+	if (((rt->rt6i_dst.plen != 128 ||
+	      !ipv6_addr_equal(&fl->fl6_dst, &rt->rt6i_dst.addr))
+	     && (np->daddr_cache == NULL ||
+		 !ipv6_addr_equal(&fl->fl6_dst, np->daddr_cache)))
+	    || (fl->oif && fl->oif != dst->dev->ifindex)) {
+		dst_release(dst);
+		dst = NULL;
 	}
 
+out:
+	return dst;
+}
+
+static int ip6_dst_lookup_tail(struct sock *sk,
+			       struct dst_entry **dst, struct flowi *fl)
+{
+	int err;
+
 	if (*dst == NULL)
 		*dst = ip6_route_output(sk, fl);
 
@@ -773,7 +776,6 @@
 
 	if (ipv6_addr_any(&fl->fl6_src)) {
 		err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src);
-
 		if (err)
 			goto out_err_release;
 	}
@@ -786,8 +788,48 @@
 	return err;
 }
 
+/**
+ *	ip6_dst_lookup - perform route lookup on flow
+ *	@sk: socket which provides route info
+ *	@dst: pointer to dst_entry * for result
+ *	@fl: flow to lookup
+ *
+ *	This function performs a route lookup on the given flow.
+ *
+ *	It returns zero on success, or a standard errno code on error.
+ */
+int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
+{
+	*dst = NULL;
+	return ip6_dst_lookup_tail(sk, dst, fl);
+}
 EXPORT_SYMBOL_GPL(ip6_dst_lookup);
 
+/**
+ *	ip6_sk_dst_lookup - perform socket cached route lookup on flow
+ *	@sk: socket which provides the dst cache and route info
+ *	@dst: pointer to dst_entry * for result
+ *	@fl: flow to lookup
+ *
+ *	This function performs a route lookup on the given flow with the
+ *	possibility of using the cached route in the socket if it is valid.
+ *	It will take the socket dst lock when operating on the dst cache.
+ *	As a result, this function can only be used in process context.
+ *
+ *	It returns zero on success, or a standard errno code on error.
+ */
+int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
+{
+	*dst = NULL;
+	if (sk) {
+		*dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
+		*dst = ip6_sk_dst_check(sk, *dst, fl);
+	}
+
+	return ip6_dst_lookup_tail(sk, dst, fl);
+}
+EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup);
+
 static inline int ip6_ufo_append_data(struct sock *sk,
 			int getfrag(void *from, char *to, int offset, int len,
 			int odd, struct sk_buff *skb),
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 923989d..b76fd7f 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -270,7 +270,7 @@
 	inet->rcv_saddr = LOOPBACK4_IPV6;
 
 	sk->sk_gso_type = SKB_GSO_TCPV6;
-	ip6_dst_store(sk, dst, NULL);
+	__ip6_dst_store(sk, dst, NULL);
 
 	icsk->icsk_ext_hdr_len = 0;
 	if (np->opt)
@@ -947,7 +947,7 @@
 	 */
 
 	sk->sk_gso_type = SKB_GSO_TCPV6;
-	ip6_dst_store(newsk, dst, NULL);
+	__ip6_dst_store(newsk, dst, NULL);
 
 	newtcp6sk = (struct tcp6_sock *)newsk;
 	inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ccc57f4..3d54f24 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -782,7 +782,7 @@
 		connected = 0;
 	}
 
-	err = ip6_dst_lookup(sk, &dst, fl);
+	err = ip6_sk_dst_lookup(sk, &dst, fl);
 	if (err)
 		goto out;
 	if (final_p)