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#ifndef __LINUX_GRE_WRAPPER_H
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#define __LINUX_GRE_WRAPPER_H
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#include <linux/skbuff.h>
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#include <net/ip_tunnels.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)
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#include_next <net/gre.h>
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#else /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) */
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#define GREPROTO_CISCO 0
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#define GREPROTO_MAX 2
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int (*handler)(struct sk_buff *skb);
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int gre_add_protocol(const struct gre_protocol *proto, u8 version);
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int gre_del_protocol(const struct gre_protocol *proto, u8 version);
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#define GRE_HEADER_SECTION 4
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#define MAX_GRE_PROTO_PRIORITY 255
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struct gre_cisco_protocol {
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int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
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#define gre_build_header rpl_gre_build_header
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void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
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#define gre_handle_offloads rpl_gre_handle_offloads
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struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum);
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int gre_cisco_register(struct gre_cisco_protocol *proto);
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int gre_cisco_unregister(struct gre_cisco_protocol *proto);
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static inline int ip_gre_calc_hlen(__be16 o_flags)
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if (o_flags & TUNNEL_CSUM)
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if (o_flags & TUNNEL_KEY)
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if (o_flags & TUNNEL_SEQ)
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static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
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tflags |= TUNNEL_CSUM;
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if (flags & GRE_ROUTING)
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tflags |= TUNNEL_ROUTING;
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if (flags & GRE_STRICT)
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tflags |= TUNNEL_STRICT;
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if (flags & GRE_VERSION)
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tflags |= TUNNEL_VERSION;
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static inline __be16 tnl_flags_to_gre_flags(__be16 tflags)
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if (tflags & TUNNEL_CSUM)
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if (tflags & TUNNEL_ROUTING)
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if (tflags & TUNNEL_KEY)
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if (tflags & TUNNEL_SEQ)
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if (tflags & TUNNEL_STRICT)
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if (tflags & TUNNEL_REC)
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if (tflags & TUNNEL_VERSION)