vxlan: add ttl inherit support

[linux-2.6-microblaze.git] / include / net / ip_tunnels.h

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 540a4b4..751646a 100644 (file)
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -379,6 +379,17 @@ static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
                return 0;
 }
 
+static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph,
+                                      const struct sk_buff *skb)
+{
+       if (skb->protocol == htons(ETH_P_IP))
+               return iph->ttl;
+       else if (skb->protocol == htons(ETH_P_IPV6))
+               return ((const struct ipv6hdr *)iph)->hop_limit;
+       else
+               return 0;
+}
+
 /* Propogate ECN bits out */
 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
                                     const struct sk_buff *skb)