1 #ifndef __LINUX_GRE_WRAPPER_H
2 #define __LINUX_GRE_WRAPPER_H
4 #include <linux/skbuff.h>
5 #include <net/ip_tunnels.h>
7 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,37)
8 #include_next <net/gre.h>
10 #else /* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,37) */
12 #define GREPROTO_CISCO 0
13 #define GREPROTO_MAX 2
16 int (*handler)(struct sk_buff *skb);
19 int gre_add_protocol(const struct gre_protocol *proto, u8 version);
20 int gre_del_protocol(const struct gre_protocol *proto, u8 version);
28 #define GRE_HEADER_SECTION 4
30 #define MAX_GRE_PROTO_PRIORITY 255
31 struct gre_cisco_protocol {
32 int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
36 #define gre_build_header rpl_gre_build_header
37 void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
40 #define gre_handle_offloads rpl_gre_handle_offloads
41 struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum);
43 int gre_cisco_register(struct gre_cisco_protocol *proto);
44 int gre_cisco_unregister(struct gre_cisco_protocol *proto);
46 static inline int ip_gre_calc_hlen(__be16 o_flags)
50 if (o_flags & TUNNEL_CSUM)
52 if (o_flags & TUNNEL_KEY)
54 if (o_flags & TUNNEL_SEQ)
59 static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
64 tflags |= TUNNEL_CSUM;
65 if (flags & GRE_ROUTING)
66 tflags |= TUNNEL_ROUTING;
71 if (flags & GRE_STRICT)
72 tflags |= TUNNEL_STRICT;
75 if (flags & GRE_VERSION)
76 tflags |= TUNNEL_VERSION;
81 static inline __be16 tnl_flags_to_gre_flags(__be16 tflags)
85 if (tflags & TUNNEL_CSUM)
87 if (tflags & TUNNEL_ROUTING)
89 if (tflags & TUNNEL_KEY)
91 if (tflags & TUNNEL_SEQ)
93 if (tflags & TUNNEL_STRICT)
95 if (tflags & TUNNEL_REC)
97 if (tflags & TUNNEL_VERSION)