gre.h

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#ifndef __LINUX_GRE_H
#define __LINUX_GRE_H

#include <linux/skbuff.h>

#define GREPROTO_CISCO      0
#define GREPROTO_PPTP       1
#define GREPROTO_MAX        2

struct gre_protocol {
    int  (*handler)(struct sk_buff *skb);
    void (*err_handler)(struct sk_buff *skb, u32 info);
};

int gre_add_protocol(const struct gre_protocol *proto, u8 version);
int gre_del_protocol(const struct gre_protocol *proto, u8 version);

#endif