4 #include <linux/skbuff.h>
5 #include <net/ip_tunnels.h>
7 #define GREPROTO_CISCO 0
8 #define GREPROTO_PPTP 1
12 int (*handler
)(struct sk_buff
*skb
);
13 void (*err_handler
)(struct sk_buff
*skb
, u32 info
);
20 #define GRE_HEADER_SECTION 4
22 int gre_add_protocol(const struct gre_protocol
*proto
, u8 version
);
23 int gre_del_protocol(const struct gre_protocol
*proto
, u8 version
);
25 static inline __be16
gre_flags_to_tnl_flags(__be16 flags
)
30 tflags
|= TUNNEL_CSUM
;
31 if (flags
& GRE_ROUTING
)
32 tflags
|= TUNNEL_ROUTING
;
37 if (flags
& GRE_STRICT
)
38 tflags
|= TUNNEL_STRICT
;
41 if (flags
& GRE_VERSION
)
42 tflags
|= TUNNEL_VERSION
;
47 static inline __be16
tnl_flags_to_gre_flags(__be16 tflags
)
51 if (tflags
& TUNNEL_CSUM
)
53 if (tflags
& TUNNEL_ROUTING
)
55 if (tflags
& TUNNEL_KEY
)
57 if (tflags
& TUNNEL_SEQ
)
59 if (tflags
& TUNNEL_STRICT
)
61 if (tflags
& TUNNEL_REC
)
63 if (tflags
& TUNNEL_VERSION
)