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);
24 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)
29 #define GRE_HEADER_SECTION 4
31 static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
36 tflags |= TUNNEL_CSUM;
37 if (flags & GRE_ROUTING)
38 tflags |= TUNNEL_ROUTING;
43 if (flags & GRE_STRICT)
44 tflags |= TUNNEL_STRICT;
47 if (flags & GRE_VERSION)
48 tflags |= TUNNEL_VERSION;
53 static inline __be16 tnl_flags_to_gre_flags(__be16 tflags)
57 if (tflags & TUNNEL_CSUM)
59 if (tflags & TUNNEL_ROUTING)
61 if (tflags & TUNNEL_KEY)
63 if (tflags & TUNNEL_SEQ)
65 if (tflags & TUNNEL_STRICT)
67 if (tflags & TUNNEL_REC)
69 if (tflags & TUNNEL_VERSION)
74 #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0) */
76 #define MAX_GRE_PROTO_PRIORITY 255
77 struct gre_cisco_protocol {
78 int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
82 int gre_cisco_register(struct gre_cisco_protocol *proto);
83 int gre_cisco_unregister(struct gre_cisco_protocol *proto);
85 #define gre_build_header rpl_gre_build_header
86 void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
89 #define gre_handle_offloads rpl_gre_handle_offloads
90 struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum);
92 static inline int ip_gre_calc_hlen(__be16 o_flags)
96 if (o_flags & TUNNEL_CSUM)
98 if (o_flags & TUNNEL_KEY)
100 if (o_flags & TUNNEL_SEQ)