[IPV4]: Always set fl.proto in ip_route_newports

ip_route_newports uses the struct flowi from the struct rtable returned
by ip_route_connect for the new route lookup and just replaces the port
numbers if they have changed. If an IPsec policy exists which doesn't match
port 0 the struct flowi won't have the proto field set and no xfrm lookup
is done for the changed ports.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 6 insertions, 4 deletions

diff --git a/include/net/route.h b/include/net/route.h
index e3e5436f8017..9c04f15090d2 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -170,8 +170,8 @@ static inline int ip_route_connect(struct rtable **rp, u32 dst,
         return ip_route_output_flow(rp, &fl, sk, 0);
 }
 
-static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
-                                    struct sock *sk)
+static inline int ip_route_newports(struct rtable **rp, u8 protocol,
+                                    u16 sport, u16 dport, struct sock *sk)
 {
         if (sport != (*rp)->fl.fl_ip_sport ||
             dport != (*rp)->fl.fl_ip_dport) {
@@ -180,6 +180,7 @@ static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
                 memcpy(&fl, &(*rp)->fl, sizeof(fl));
                 fl.fl_ip_sport = sport;
                 fl.fl_ip_dport = dport;
+                fl.proto = protocol;
                 ip_rt_put(*rp);
                 *rp = NULL;
                 return ip_route_output_flow(rp, &fl, sk, 0);
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 00f983226672..dc0487b5bace 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -119,7 +119,8 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
         if (err != 0)
                 goto failure;
 
-        err = ip_route_newports(&rt, inet->sport, inet->dport, sk);
+        err = ip_route_newports(&rt, IPPROTO_DCCP, inet->sport, inet->dport,
+                                sk);
         if (err != 0)
                 goto failure;
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 6ea353907af5..1ac35a65b2e5 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -236,7 +236,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
         if (err)
                 goto failure;
 
-        err = ip_route_newports(&rt, inet->sport, inet->dport, sk);
+        err = ip_route_newports(&rt, IPPROTO_TCP, inet->sport, inet->dport, sk);
         if (err)
                 goto failure;