+static inline struct rtable *find_route(struct net *net,
+ __be32 *saddr, __be32 daddr,
+ u8 ipproto, u8 tos, u32 skb_mark)
+{
+ struct rtable *rt;
+ /* Tunnel configuration keeps DSCP part of TOS bits, But Linux
+ * router expect RT_TOS bits only. */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+ struct flowi fl = { .nl_u = { .ip4_u = {
+ .daddr = daddr,
+ .saddr = *saddr,
+ .tos = RT_TOS(tos) } },
+ .mark = skb_mark,
+ .proto = ipproto };
+
+ if (unlikely(ip_route_output_key(net, &rt, &fl)))
+ return ERR_PTR(-EADDRNOTAVAIL);
+ *saddr = fl.nl_u.ip4_u.saddr;
+ return rt;
+#else
+ struct flowi4 fl = { .daddr = daddr,
+ .saddr = *saddr,
+ .flowi4_tos = RT_TOS(tos),
+ .flowi4_mark = skb_mark,
+ .flowi4_proto = ipproto };
+
+ rt = ip_route_output_key(net, &fl);
+ *saddr = fl.saddr;
+ return rt;
+#endif
+}