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include/net/gre.h
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PPTP: PPP over IP...
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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
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