1 files changed, 62 insertions, 39 deletions

diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index e6cee5292a0..0251a6005be 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -55,26 +55,26 @@ int inet6_csk_bind_conflict(const struct sock *sk,
 EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
 
 struct dst_entry *inet6_csk_route_req(struct sock *sk,
+				      struct flowi6 *fl6,
 				      const struct request_sock *req)
 {
 	struct inet6_request_sock *treq = inet6_rsk(req);
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct in6_addr *final_p, final;
 	struct dst_entry *dst;
-	struct flowi6 fl6;
 
-	memset(&fl6, 0, sizeof(fl6));
-	fl6.flowi6_proto = IPPROTO_TCP;
-	fl6.daddr = treq->rmt_addr;
-	final_p = fl6_update_dst(&fl6, np->opt, &final);
-	fl6.saddr = treq->loc_addr;
-	fl6.flowi6_oif = sk->sk_bound_dev_if;
-	fl6.flowi6_mark = sk->sk_mark;
-	fl6.fl6_dport = inet_rsk(req)->rmt_port;
-	fl6.fl6_sport = inet_rsk(req)->loc_port;
-	security_req_classify_flow(req, flowi6_to_flowi(&fl6));
+	memset(fl6, 0, sizeof(*fl6));
+	fl6->flowi6_proto = IPPROTO_TCP;
+	fl6->daddr = treq->rmt_addr;
+	final_p = fl6_update_dst(fl6, np->opt, &final);
+	fl6->saddr = treq->loc_addr;
+	fl6->flowi6_oif = treq->iif;
+	fl6->flowi6_mark = sk->sk_mark;
+	fl6->fl6_dport = inet_rsk(req)->rmt_port;
+	fl6->fl6_sport = inet_rsk(req)->loc_port;
+	security_req_classify_flow(req, flowi6_to_flowi(fl6));
 
-	dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
+	dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
 	if (IS_ERR(dst))
 		return NULL;
 
@@ -171,7 +171,8 @@ EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
 
 static inline
 void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
-			   struct in6_addr *daddr, struct in6_addr *saddr)
+			   const struct in6_addr *daddr,
+			   const struct in6_addr *saddr)
 {
 	__ip6_dst_store(sk, dst, daddr, saddr);
 
@@ -203,43 +204,52 @@ struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
 	return dst;
 }
 
-int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
+static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
+						struct flowi6 *fl6)
 {
-	struct sock *sk = skb->sk;
 	struct inet_sock *inet = inet_sk(sk);
 	struct ipv6_pinfo *np = inet6_sk(sk);
-	struct flowi6 fl6;
-	struct dst_entry *dst;
 	struct in6_addr *final_p, final;
-	int res;
+	struct dst_entry *dst;
 
-	memset(&fl6, 0, sizeof(fl6));
-	fl6.flowi6_proto = sk->sk_protocol;
-	fl6.daddr = np->daddr;
-	fl6.saddr = np->saddr;
-	fl6.flowlabel = np->flow_label;
-	IP6_ECN_flow_xmit(sk, fl6.flowlabel);
-	fl6.flowi6_oif = sk->sk_bound_dev_if;
-	fl6.flowi6_mark = sk->sk_mark;
-	fl6.fl6_sport = inet->inet_sport;
-	fl6.fl6_dport = inet->inet_dport;
-	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+	memset(fl6, 0, sizeof(*fl6));
+	fl6->flowi6_proto = sk->sk_protocol;
+	fl6->daddr = np->daddr;
+	fl6->saddr = np->saddr;
+	fl6->flowlabel = np->flow_label;
+	IP6_ECN_flow_xmit(sk, fl6->flowlabel);
+	fl6->flowi6_oif = sk->sk_bound_dev_if;
+	fl6->flowi6_mark = sk->sk_mark;
+	fl6->fl6_sport = inet->inet_sport;
+	fl6->fl6_dport = inet->inet_dport;
+	security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
 
-	final_p = fl6_update_dst(&fl6, np->opt, &final);
+	final_p = fl6_update_dst(fl6, np->opt, &final);
 
 	dst = __inet6_csk_dst_check(sk, np->dst_cookie);
+	if (!dst) {
+		dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
 
-	if (dst == NULL) {
-		dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
+		if (!IS_ERR(dst))
+			__inet6_csk_dst_store(sk, dst, NULL, NULL);
+	}
+	return dst;
+}
 
-		if (IS_ERR(dst)) {
-			sk->sk_err_soft = -PTR_ERR(dst);
-			sk->sk_route_caps = 0;
-			kfree_skb(skb);
-			return PTR_ERR(dst);
-		}
+int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
+{
+	struct sock *sk = skb->sk;
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct flowi6 fl6;
+	struct dst_entry *dst;
+	int res;
 
-		__inet6_csk_dst_store(sk, dst, NULL, NULL);
+	dst = inet6_csk_route_socket(sk, &fl6);
+	if (IS_ERR(dst)) {
+		sk->sk_err_soft = -PTR_ERR(dst);
+		sk->sk_route_caps = 0;
+		kfree_skb(skb);
+		return PTR_ERR(dst);
 	}
 
 	rcu_read_lock();
@@ -253,3 +263,16 @@ int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
 	return res;
 }
 EXPORT_SYMBOL_GPL(inet6_csk_xmit);
+
+struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
+{
+	struct flowi6 fl6;
+	struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
+
+	if (IS_ERR(dst))
+		return NULL;
+	dst->ops->update_pmtu(dst, sk, NULL, mtu);
+
+	return inet6_csk_route_socket(sk, &fl6);
+}
+EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);