gre: export gre_build_header() function.

[cascardo/linux.git] / include / net / gre.h

diff --git a/include/net/gre.h b/include/net/gre.h
index 9f03a39..cbb9d51 100644 (file)
--- a/include/net/gre.h
+++ b/include/net/gre.h
@@ -7,6 +7,7 @@
 #define GREPROTO_CISCO         0
 #define GREPROTO_PPTP          1
 #define GREPROTO_MAX           2
+#define GRE_IP_PROTO_MAX       2
 
 struct gre_protocol {
        int  (*handler)(struct sk_buff *skb);
@@ -22,6 +23,31 @@ struct gre_base_hdr {
 int gre_add_protocol(const struct gre_protocol *proto, u8 version);
 int gre_del_protocol(const struct gre_protocol *proto, u8 version);
 
+struct gre_cisco_protocol {
+       int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
+       int (*err_handler)(struct sk_buff *skb, u32 info,
+                          const struct tnl_ptk_info *tpi);
+       u8 priority;
+};
+
+int gre_cisco_register(struct gre_cisco_protocol *proto);
+int gre_cisco_unregister(struct gre_cisco_protocol *proto);
+void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
+                     int hdr_len);
+
+static inline int ip_gre_calc_hlen(__be16 o_flags)
+{
+       int addend = 4;
+
+       if (o_flags&TUNNEL_CSUM)
+               addend += 4;
+       if (o_flags&TUNNEL_KEY)
+               addend += 4;
+       if (o_flags&TUNNEL_SEQ)
+               addend += 4;
+       return addend;
+}
+
 static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
 {
        __be16 tflags = 0;