openvswitch: Introduce ovs_tunnel_route_lookup

Introduce ovs_tunnel_route_lookup to consolidate route lookup
shared by vxlan, gre, and geneve ports.

Signed-off-by: Fan Du <fan.du@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 0 deletions

diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h
index 99c8e71d9e6c..f8ae295fb001 100644
--- a/net/openvswitch/vport.h
+++ b/net/openvswitch/vport.h
@@ -236,4 +236,22 @@ static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
 int ovs_vport_ops_register(struct vport_ops *ops);
 void ovs_vport_ops_unregister(struct vport_ops *ops);
 
+static inline struct rtable *ovs_tunnel_route_lookup(struct net *net,
+                                                     const struct ovs_key_ipv4_tunnel *key,
+                                                     u32 mark,
+                                                     struct flowi4 *fl,
+                                                     u8 protocol)
+{
+        struct rtable *rt;
+
+        memset(fl, 0, sizeof(*fl));
+        fl->daddr = key->ipv4_dst;
+        fl->saddr = key->ipv4_src;
+        fl->flowi4_tos = RT_TOS(key->ipv4_tos);
+        fl->flowi4_mark = mark;
+        fl->flowi4_proto = protocol;
+
+        rt = ip_route_output_key(net, fl);
+        return rt;
+}
 #endif /* vport.h */